CN105548681B

CN105548681B - The measuring method and its device of a kind of power factor

Info

Publication number: CN105548681B
Application number: CN201610071457.0A
Authority: CN
Inventors: 林纪秋; 林琳
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-02
Filing date: 2016-02-02
Publication date: 2018-07-10
Anticipated expiration: 2036-02-02
Also published as: CN105548681A

Abstract

The present invention discloses the measuring method and measuring device of a kind of single-phase power factor, utilize the measurement voltage of same phase, what the secondary current of current transformer was converted by resistance, and by the sinusoidal voltage waveform signal for filtering out the processing such as harmonic wave interference of electronic circuit, that is voltage transformer, time difference during the quadratic sine waveform signal zero passage of current transformer and directly acquire the new method of the power factor value in memory respective memory unit using the time difference as storage address, and it describes and is suitable for different occasions using three kinds of this method, with advanced or lag instruction single-phase power factor measuring device.

Description

The measuring method and its device of a kind of power factor

Technical field

Measuring method and its measuring device more particularly to a kind of work of number display the present invention relates to a kind of power factor Frequency single-phase power factor measuring method and its measuring device.

Background technology

Power factorIt is one of important parameter in AC electric power systems.Immediately each cycle, is accurately measured Power factor value be electric measurement equipment top priority.The existing instrument and meter measured applied to electric power factor is basic On be two major class, one kind is to measure and show that there is only larger mistakes using traditional pointer-type, dial insrument Difference is also significantly not suitable with the requirement of modern digital；Another kind of is using semiconductor components and devices, integrated circuit or microcontroller The instrument and meter of composition, and according to signal, data processing method be differently formed principle, configurations modernization measure dress It puts, has been the current direction using trend and digital development.But instrument and meter, the measuring device of these modernizations Measuring method in, have plenty of by by the shaped circuit conversion of two-way input signal into square-wave signal, by square-wave signal through different Or a row pulse is obtained after logical process, then the DC voltage directly proportional to phase difference is obtained after rectified filtering, complete phase Then phase signal is carried out analog-digital conversion (ADC) and cos operation, obtains power factor value by detection；Have plenty of It acquires and power factor value is obtained with look-up table (cosine table) after phase difference angle；Some is obtained by simulating multiplication and division circuit computing Go out the powerfactorcosφ value of circuit；Also using many methods in phase detection techniques, application conditions, measurement Range, measurement accuracy and hardware, software complexity all have nothing in common with each other, but what is finally obtained is all electric current, voltage two Phase difference, that is, phase angle difference φ between signal, is converted into powerfactorcosφ value, it is also necessary to which one-chip computer is another by phase difference The secondary software program by calling calculating power factor, which calculate, could really obtain specific power factor value, this undoubtedly increases Add the calculation amount of microcontroller, the usage times for occupying microcontroller reduce its working efficiency more.In short, at present work( Rate factor measuring method or device are required for the phase difference of acquirement to pass through as aforementioned various indirect modes convert again Power factor value, and power factor value this measurement result can not be obtained with directly settling at one go.

Invention content

It is an object of the invention to overcome the deficiencies of the prior art and provide it is a kind of directly, the power factor that settles at one go Measuring method and measuring device, and the software journey of calculating power factor need not be called by indirect mode or by microcontroller again Sequence is calculated the final result to obtain power-factor measurement, makes the measurement of power frequency single-phase power factor more rapidly, accurately.

The technical solution adopted by the present invention is：

A kind of measuring method of power factor is applied to power-factor measurement device, and the electricity of measuring device input Pressure and two signals of electric current be respectively the measurement voltage of same phase, current transformer secondary current be converted by resistance And the sinusoidal voltage waveform signal for filtering out harmonic wave interference processing by electronic circuit, referred to as voltage transformer, electric current be mutual The quadratic sine waveform signal of sensor, the measuring method include a power factor and calculate formula, calculated by the formula Storage, application process to data and to these data, include the following steps：

(1) power factor calculates formula：

In formula, f_rIt is the rated frequency of electric system, to the sine wave of the voltage of same phase, electric current when t is rated frequency The time value that time difference during shape signal zero passage is counted to get, unit are microsecond (us)；

(2) single-phase power factor of power frequencyIn0~90 ° is taken, is corresponded toRadian is specified frequency Rate f_rWhen a cycle T_rA quarter, i.e.,In formula, T_rPeriod time value when being rated frequency；Setting Electric system rated frequency is f_rWhenInIt is changed to by 0The Hus times are needed, thenWherein H takes Positive integer, unit us；Time t value by 1us, by be incremented by 1us every time, until the Hus until, substitute into work(one by one respectively T in rate factor calculation formula is calculated HValue, the HValue comprising four after decimal point Numerical value；Obtained HValue Data according to time t value ascending sequential organization into time t value and power factor It is worth conversion table, referred to as " conversion table "；

(3) it is represented respectively with 16 bits until time t value being played Hus from 1us, successively as the ground of memory Location is simultaneously a the H in conversion table correspondingly4 bit digitals use four binary-decimal BCD after the decimal point of value In the storage unit of code deposit memory, memory uses electrically erasable programmable ROM EEPROM, and storage address is held Amount is more than 5K, each storage unit of a memory is a byte, can store 2 four binary coded decimal binary-coded decimals It is exactly 2 decimal numbers, the storage unit of two bytes stores 4 decimal numbers, i.e., with the memory of two 8K × 8, in order, First memory stores oneFront two after the decimal point of value in 4 ten's digits, second memory are deposited Put oneLatter two after the decimal point of value in 4 ten's digits；Wherein, the t values the corresponding 0th in conversion table ~31It is 1.0000 to be worth, and is all changed to after 0.9999 the storage of 4-digit number deposit appropriate address after decimal point In unit；

(4) using two signal zero passages of the voltage and current of acquisition the time difference or perhaps time counting value when are as storage Device address directly reads the power factor value in memory respective memory unit and output.

A kind of measuring device of power factor, using a kind of power-factor measurement method, measuring device input Two signals of voltage and current be respectively the measurement voltage of same phase, current transformer secondary current by resistance convert Into and the sinusoidal voltage waveform signal for filtering out harmonic wave interference processing by electronic circuit, referred to as voltage transformer, electric current The quadratic sine waveform signal of mutual inductor, the measuring device of the power factor include first, second, third and fourth circuit unit, and the tenth Two circuit units and a time data application module store H in conversion table in the form of binary-coded decimalTwo ground of value The electrically erasable programmable ROM of location line parallel connection is connected in time data application module；

Wherein, the circuit structure of first and second circuit unit, component and its parameter are identical, be the voltage of input, Current Transformer Secondary sine wave-shaped signal is converted into the circuit of the square-wave signal output of Transistor-Transistor Logic level respectively,

First circuit unit includes forward voltage follower U₁, have open-loop gain voltage comparator U₄, resistance R₄、R₅、 R₈、R₉, capacitance C₁, diode D₁, diode D₂, have the NAND gate U of Schmidt trigger₆And U₈, its connection be voltage transformer Quadratic sine waveform signal access U₁In-phase input end, U₁Inverting input and U₁Output terminal be connected, U₁Output End and R₄One end be connected, R₄The other end and U₄In-phase input end be connected, R₅The other end and U₄Inverting input It is connected, U₄Output terminal and R₈One end be connected, R₈The other end and R₉One end be connected, R₉The other end connection simulation Ground, C₁And R₉Parallel connection, R₈The other end and U₆Two input terminals be connected, diode D₁Input terminal and U₆Two input terminals It is connected, D₁Output terminal connection+5V, D₂Output terminal connection D₁Input terminal, D₂Input terminal connection digitally, U₆Output End and U₈Two input terminals be connected, U₈Output terminal be the first circuit unit output terminal, export high level rectangular wave Pulse signal；

Second circuit unit includes forward voltage follower U₃, have open-loop gain voltage comparator U₅, resistance R₆、R₇、 R₁₀、R₁₁, capacitance C₂, diode D₃, diode D₄, have the NAND gate U of Schmidt trigger₇And U₉, connection is Current Mutual Inductance The quadratic sine waveform signal access U of device₃In-phase input end, U₃Inverting input and U₃Output terminal be connected, U₃It is defeated Outlet and R₆One end be connected, R₆The other end and U₅In-phase input end be connected, R₇The other end and U₅Anti-phase input End is connected, U₅Output terminal and R₁₀One end be connected, R₁₀The other end and R₁₁One end be connected, R₁₁The other end connect Meet simulation ground, C₂And R₁₁Parallel connection, R₁₀The other end and U₇Two input terminals be connected, diode D₃Input terminal and U₇Two A input terminal is connected, D₃Output terminal connection+5V, D₄Output terminal connection D₃Input terminal, D₄Input terminal connection number Ground, U₇Output terminal and U₉Two input terminals be connected, U₉Output terminal be second circuit unit output terminal, output is high The rectangular wave pulse signal of level；

Third circuit unit is a zero-point voltage adjustment circuit unit, including voltage follower U₂, adjustable resistance R₁、 Resistance R₂、R₃, connection is adjustable resistance R₁One end connection+15V, the other end connection -15V, adjustable resistance R₁It is adjustable End connection R₂One end, R₂The other end connection R₃One end, R₃The other end connection simulation ground, R₂The other end and U₂Same phase Input terminal is connected, U₂Inverting input and U₂Output terminal be connected, U₂The output of output terminal be divided into two-way, all the way and The R of first circuit unit₅One end be connected, R₅The other end and U₄Inverting input be connected, another way and second circuit The R of unit₇One end be connected, R₇The other end and U₅Inverting input be connected；

4th circuit unit is by AND gate circuit U₁₀With OR circuit U₁₁It forms, connection is U₈Output terminal connection U₁₀'s Input terminal 1_INAnd U₁₁4 end feet of input terminal；U₉Output terminal connection U₁₁Input terminal 2_INAnd U₁₀3 end feet of input terminal；

12nd circuit unit be one with LED light come indicated horsepower factor is advanced, circuit of lag, including one 4 Position bidirectional shift register U₁₆, two gate circuit U in hex inverter₁₃、U₁₄, resistance R₁₂、R₁₃, instructed voltage is advanced Green LED lamp D₅, the advanced red LED lamp D of an indicator current₆With resistance R₁₄, capacitance C₃An and pulse-delay unit；U₁₁ Output terminal output signal be input to U after the delay of the pulse-delay unit slightly microsecond₁₆11 feet, i.e. CP ends, with interception Precedence in both voltage, electric currents signal is that can determine whether and make advanced or lag red, green lamplight pointing, pulse daley The component of device includes an OR circuit U₂₁, two OR-NOT circuit U₂₃、U₂₄, a gate circuit U in hex inverter₂₂With Resistance R₁₆, capacitance C₅；The connection of pulse-delay unit is U₁₁Output terminal connect U respectively₂₁Two input terminals, U₂₁Output terminal And R₁₆One end be connected, R₁₆The other end respectively with U₂₃An input terminal and C₅One end be connected, C₅The other end connect It connects digitally, U₂₃Another input terminal and U₂₄Output terminal be connected, U₂₃Output terminal and U₂₄An input terminal be connected It connects, U₂₂Input terminal and U₂₁Output terminal be connected, U₂₂Output terminal and U₂₄Another input terminal be connected, U₂₄Output End is the output terminal of pulse-delay unit, which is connected to U₁₆11 feet, i.e. CP ends；

U in 12nd circuit unit₁₆3 feet and U₈Output terminal be connected, U₁₆5 feet and U₉Output terminal be connected It connects, U₁₆1,9,10 feet and R₁₄One end be connected, R₁₄The other end be connected with+5V, R₁₄One end also and C₃One end phase Connection, C₃The other end connection digitally, U₁₆15 feet and U₁₃Input terminal be connected, U₁₃Output terminal and green LED lamp D₅ Cathode be connected, D₅Anode pass through R₁₂It is connected with+5V, U₁₆13 feet and U₁₄Input terminal be connected, U₁₄Output terminal With red LED lamp D₆Cathode be connected, D₆Anode pass through R₁₃It is connected with+5V；

One time data application module stores H in conversion table in the form of binary-coded decimalTwo address wires of value Electrically erasable programmable ROM in parallel is connected in the time data application module.The time data application module has Two kinds of application forms：When application power-factor measurement method of the present invention power-factor measurement device be applied to measurement it is accurate When degree requires relatively low common survey occasion, the time data application module in measuring device uses measurement type time data application Module, device are known as measurement type power-factor measurement device；When the power factor of application power-factor measurement method of the present invention is surveyed When amount device is applied to the AC energy metering occasion more demanding to accuracy of measurement, the time data in measuring device should With module using metering type time data application module, device is known as metering type power-factor measurement device；

When the power-factor measurement device of application power-factor measurement method of the present invention is applied to want accuracy of measurement When seeking relatively low common survey occasion, the time data application module in measuring device uses measurement type time data application mould Block, including the five, the six, seven, eight, nine, ten, 11 circuit units；

5th circuit unit is 10MHZ pulses generations and ten frequency dividing circuits, and the 1MHZ pulse inputs of output are electric to the 6th Road unit, the 5th circuit unit include 10MHZ crystal oscillators, hex inverter U₃₀, decimal system coincidence counter U₂₉, electricity Hinder R₁₇、R₁₈、R₁₉, capacitance C₆, connection is hex inverter U₃₀The 1st, connection resistance R between 2 feet₁₈, U₃₀The 3rd, 4 feet it Between connect R₁₉, U₃₀The 2nd, connect C between 3 feet₆, U₃₀The 1st, 10MHZ crystal oscillators, U are connected between 4 feet₃₀The 2nd foot It is connected with the 13rd foot, U₃₀The 12nd foot and decimal system coincidence counter U₂₉The 2nd foot CP ends be connected, U₂₉The 1st, 7,9 and 10 feet pass through resistance R₁₇It is connect with+5V power supplys, U₂₉1MHZ pulses of the 15th foot output 10MHZ after ten frequency dividings, i.e., per microsecond For 1 pulse；

6th circuit unit is by four tetrad coincidence counter U₂₅、U₂₆、U₂₇、U₂₈One to be connected in sequence A 16 binary time pulse counting circuits, output is 16 binary systems for being incremented by 1us by zero, every time It counts, first, i.e. U, left side in four counters₂₅The 14th foot be output 16 bits in lowest order, this four First, i.e. U, right side in a counter₂₈The 11st foot be highest order in 16 bits of output, connection is, U₂₅The 15th foot connection U₂₆The 10th foot, U₂₆The 15th foot connection U₂₇The 10th foot, U₂₇The 15th foot connection U₂₈The 10th foot, 2nd foot CP ends of four counters and U₂₉The 15th foot be connected, four counters the 7th, 9 feet and U₂₅The 10th foot pass through Resistance R₁₇It is connected with+5V power supplys, the 1st foot of four countersEnd and the U of the 4th circuit unit₁₁Output terminal be connected It connects；

7th circuit unit is a holding impulse circuit, by 42 inputs and door U₃₅In an AND gate circuit form；Institute It is the time that temporary sampling time data are at least kept to a 20ms, i.e. cycle to state and keep impulse circuit, keeps pulse electricity The condition of the setting on road is,It is kept for the time that pulse occurs should be at the 5000us that time counting circuit starts after counting to arrive Between 10ms and as close to this side of 5000us,Hardware used is few as possible when setting the holding pulse；According to aforementioned Condition selects decimal number 5120 after relatively, and setting method is, decimal number 5120 is converted into binary number, i.e. 0001,0100,0000,0000, when there is high level simultaneously for the 11st, 13 of the binary number after time counting circuit startup It is decimal numeral 5120 to represent count value；Its connection is U₃₅1 foot and the 6th circuit unit in U₂₇12 feet be connected It connects, U₃₅2 feet and U₂₈14 feet be connected, U₃₅3 feet be the 7th circuit unit output terminal, and the 9th circuit unit four The CP ends of a register are connected；

8th circuit unit is four to be incorporated to-and 4 bidirectional shift register U working in a manner of going out₃₁、U₃₂、U₃₃、U₃₄ The time data buffering circuit being in turn connected into, connection be, four registers totally 16 data output ends and the 9th circuit list 16 data input pins one-to-one correspondence of member is connected；Four registers totally 16 data input pins and the 6th circuit unit 16 A data output end one-to-one correspondence is connected, four registersEnd and the 4th circuit unit U₁₁Output terminal be connected, four The CP ends of a register and the 4th circuit unit U₁₀Output terminal be connected, four registers the 9th, 10 feet connection resistance R₂₀ One end, R₂₀The other end connected with+5V power supplys, R₂₀One end pass through C₇Connection is digitally；

9th circuit unit is four to be incorporated to-and 4 bidirectional shift register U working in a manner of going out₃₆、U₃₇、U₃₈、U₃₉ The time data holding circuit being in turn connected into, connection be, four registers first 13 in totally 16 data output ends Sequentially it is connected with 13 articles of address wire end feets of two memories of the tenth circuit unit parallel connection one-to-one correspondence, four registers are total to 16 data output ends of 16 data input pins and the 8th circuit unit one-to-one correspondence is connected, the CP ends of four registers and 7th circuit unit U₃₅3 feet be connected, four registers the 1st, 9,10 feet and resistance R₂₀One end be connected, R₂₀It is another One end is connected with+5V power supplys, R₂₀One end pass through C₇Connection is digitally；

Tenth circuit unit be arranged to two 8K × 8 of read-only working method electro erasible programmable it is read-only first A memory U₄₀With second memory U₄₁, four binary-decimal binary-coded decimals have been used in two Memory Storage Units H in form deposit conversion tableValue；Its connection is first memory U₄₀With second memory U₄₁Each 13 Address wire A₀~A₁₂It is in parallel and sequentially correspond and be connected with 13 data output ends before the 9th circuit unit, first A memory U₄₀With second memory U₄₁The 20th, 22 feet pass through R₂₁It connects digitally, first memory U₄₀With second Memory U₄₁The 27th foot pass through R₂₂Connection+5V power supplys, first memory U₄₀With second memory U₄₁Two memories Data output end mouth line I/O₀~I/O₇It is connected with the 11st circuit unit correspondence for totally 16 articles；

11st circuit unit is for showing tested power factorValue, including BCD- seven-segment decoders/drive Dynamic device U₄₂、U₄₃、U₄₄、U₄₅；Current-limiting resistance R₂₃×7、R₂₄×7、R₂₅×7、R₂₆×7；Seven sections of common-anode digital display U₄₆、U₄₇、 U₄₈、U₄₉；Wherein U₄₂、U₄₃、U₄₄、U₄₅Respective 7,1,2, totally 16 end feets form the input terminal of the 11st circuit unit to 6 feet, should The data output end mouth line I/O of 16 end feets memory in parallel with two address wires of the tenth circuit unit respectively is corresponded Connection；

When the power-factor measurement device of application power-factor measurement method of the present invention is applied to want accuracy of measurement When seeking higher AC energy (electric degree) metering occasion, the time data application module in measuring device uses metering type time number According to application module, which includes an XOR gate U₁₀₁, microcontroller that a piece of its clock crystal oscillator frequency is 12MHZ 8031 i.e. U₁₀₂, three eight rising edge d type flip flop U₁₀₃、U₁₀₄、U₁₀₅With H in conversion table are stored in the form of binary-coded decimal First memory U of two address wires parallel connection of value₄₀, second memory U₄₁, microcontroller 8031 passes through P₀Mouth extension output Mouthful, it is attached using the memory of three eight rising edge d type flip flops and two address wire parallel connections, the specific connection of circuit It is：The U of 4th circuit unit₁₀Output terminal 1_OUTAnd U₁₀₁The 1st foot be connected, the U of the 4th circuit unit₁₁Output terminal 2_OUT And U₁₀₁The 2nd foot and microcontroller U₁₀₂'sThat is U₁₀₂The 13rd foot and the 12nd circuit unit in pulse-delay unit U₂₁Two input terminals be connected, U₁₀₁The 3rd foot and U₁₀₂'sThat is U₁₀₂The 12nd foot be connected；P0 mouthfuls of microcontroller 8 end feets of line are ascending by number, i.e. by the sequence of P0.0 to P0.7 sequentially correspondingly with the 1st eight rising edge D 8 data input pin 1D~8D of trigger are connected, 8 data output end 1Q~8Q mono- of the 1st eight rising edge d type flip flops One 8 data input pin 1D~8D accordingly with the 2nd eight rising edge d type flip flops are connected, the 3rd eight rising edge D triggering 8 data input pin 1D~8D of device sequentially 8 data input pin 1D with the 1st eight rising edge d type flip flops correspondingly ~8D parallel connections are connected, 8 data output end 1Q~8Q of the 3rd eight rising edge d type flip flop and low the eight of first memory Position address wire end feet it is ascending by number, be sequentially attached correspondingly by the sequence of A0 to A7, on the 2nd eight Rise along 1Q~5Q and first memory in 8 data output ends of d type flip flop the address wire end feet of high five by number It is ascending, be sequentially attached correspondingly by the sequence of A8 to A12, the 16th foot of microcontroller, i.e.End feet and three 11st foot of a eight rising edges d type flip flop, i.e. CP end feets are connected, the 27th foot of microcontroller, i.e. P2.6 feet and the 1st eight rising Along the 1st foot of d type flip flop, i.e.End feet is connected, the 28th foot of microcontroller, i.e. P2.7 feet while and the 2nd, 3 eight rising edge D 1st foot of trigger, i.e.End feet is connected, address wire end feet A0~A12 of second memory and first memory Address wire end feet A0~A12 carries out connection in parallel correspondingly；Set 16 two of two bytes of P0 mouthfuls of output of microcontroller The address date of system number be arranged in order from lowest order to highest order, a byte is sent to eight rising edge D and touches in two times, every time 8 data input pins of device are sent out, wherein the data for being sent to the 1st eight 8 data input pins of rising edge d type flip flop for the first time are high The address of byte, the address date from the 9th of 16 bit play sixteen bit until, successively, the 9th it is right Should in eight 8 data input pins of rising edge d type flip flop 1D, the tenth correspond to 2D ... sixteen bit correspond to 8D；Second It is secondary be sent to the 3rd eight 8 data input pins of rising edge d type flip flop data be low byte address, the address date from this 16 Until first of bit plays the 8th, first successively corresponds to eight rising edge d type flip flops, 8 data inputs The 1D at end, second correspond to 2D ... the 8th corresponds to 8D；The two byte address data sent out in two times are the 3rd, the 2nd The data-out port of a eight rising edges d type flip flop is with forming 13 binary storage devices arranged in order from low to high The data of location code and data-out port 1Q~8Q and the 2nd eight rising edge d type flip flop of the 3rd eight rising edge d type flip flops Address end feet A0~A12 of output port 1Q~5Q and the memory of two address wire parallel connections has one-to-one connection to close System.

The metering type time data application module further includes peripheral component and circuit, and peripheral component and circuit include 8D latch 74LS373 with ternary output is program storage is connected with microcontroller 8031 outside the piece of extension circuit, frequency Circuit that clock crystal oscillator for 12MHZ is connect with microcontroller 8031, for needed for instant playback power factor data The circuit of BCD- seven-segment decoders/driver, current-limiting resistance and seven sections of common-anode LED digital displays connections.

The metering type time data application module also comprising a simple calculation formula and software program, passes through program Software in memory carries out simple computation to obtain more accurate time data as memory to the time data sampled Power factor value in respective memory unit is read immediately for address and display, step are：

Exclusive or gate output terminal is measured using the function and application method of the door control bit GATE of microcontroller timer i.e. U₁₀₁3 feet be output to microcontroller U₁₀₂12 feet beHigh level, i.e. positive pulse width and measure the 4th circuit unit U₁₁Output terminal 2_OUTIt is output to microcontroller U₁₀₂13 feet beHigh level, i.e. positive pulse width, and read T0 respectively T0 and T1 are closed respectively with after the count value of T1；

The value of T0 and T1 is substituted into formulaIt is calculated, after the decimal point in acquired results Value rounded up after obtain 16 bits of two bytes；

Send the high byte of 16 bits to the data output end of the 1st eight rising edge d type flip flops；

The low byte of 16 bits is sent to the data output end of the 3rd eight rising edge d type flip flops and simultaneously the Value on 1 eight rising edge d type flip flop data output end is sent on the data output end of the 2nd eight rising edge d type flip flops, this 16 bits of two bytes directly read out its corresponding storage list as the address of the memory of two address wire parallel connections Power factor numerical value in member simultaneously gives instant playback；

T0 and T1 is reset；

It is returned after putting 1 to T0 and T1, waits for next test loop.

When metering type time data application module is used in described device, to the phase of the metering type time data application module Powered-down Lu Zuoyi modification then makes it become measurement type time data application module：That is, disconnect U₁₁Output terminal 2_OUTAnd microcontroller U₁₀₂13rd foot, i.e.Between connecting line, while need not be according still further to the in claim 4A step is calculated, As long as according in claim 4 after directly reading the count value of T0Step carries out, last only T0 to be reset and again It is returned after putting 1 to T0, waits for next test loop.This change makes the measurement type power factor applied to common survey occasion Measuring device is more simple and convenient.

Technical solution more than present invention use passes through resistance using the secondary current of measurement voltage, current transformer Sinusoidal voltage waveform signal, the i.e. voltage transformer for filtering out harmonic wave interference processing, electric current being converted into and by electronic circuit The quadratic sine waveform signal input measurement device of mutual inductor eliminates wave distortion and the noise jamming of measured signal, ensures just The accurate zero crossing of string waveform signal；It is calculated by calculating power factor formula, obtained power factor numerical value is compiled Be made table and the numerical value storage in the table in memory, in use then zero passage accurate by two voltage, electric current signals when The pulse collection of generation to correct time difference time counting value in other words, and using the time difference or time counting value as Storage address directly reads the method for the power factor value in memory respective memory unit current power factor to be overcome to survey It is required for calculating, obtaining again by indirect mode the deficiency of power factor value in amount method；Simultaneously using microcontroller The minor shifts for carry out instant tracing detection to the frequency of power grid, occurring to it implement correction, it is ensured that each cycle it is single-phase Power factor is exported with accurate numerical value, by numeral method, and the advanced or lag of indicated horsepower factor immediately, it is both accurate Really and conveniently.The present invention has apparent technical advantage, can undoubtedly push further developing and producing for power-factor measurement technology Raw significant social economic effect.

Description of the drawings

The present invention is described in further details below in conjunction with the drawings and specific embodiments；

The structure diagram of measuring device when Fig. 1 present invention is using measurement type time data application module；

A kind of one of circuit diagram of measuring device of power factor of Fig. 2 present invention；

The two of a kind of circuit diagram of the measuring device of power factor of Fig. 3 present invention；

The three of a kind of circuit diagram of the measuring device of power factor of Fig. 4 present invention；

The four of a kind of circuit diagram of the measuring device of power factor of Fig. 5 present invention；

The waveform diagram of A, B, C, D, E, F, G each point in Fig. 6 measuring devices of the present invention；

The flow of singlechip application programs during metering type time data application module is used to show in Fig. 7 measuring devices of the present invention It is intended to.

Specific embodiment

As shown in Fig. 1 to one of 7, a kind of single-phase power factor measuring method of power frequency of the present invention, applied to power factor Measuring device, and the measuring device input two signals of voltage and current be respectively same phase measurement voltage, electric current it is mutual The sinusoidal voltage waveform that the secondary current of sensor is converted by resistance and by electronic circuit for filtering out harmonic wave interference processing The quadratic sine waveform signal of signal, referred to as voltage transformer, current transformer, including a kind of single-phase power of power frequency The measuring device of factor measuring method and application this method.The single-phase power factor measuring method of its power frequency include power because Data are calculated by the formula and these data organizations into conversion table, deposit memory and application in number calculation formula Method.Its power-factor measurement device using this method includes first, second, third and fourth circuit unit, the 12nd circuit unit With a time data application module, H in conversion table are stored in the form of binary-coded decimalTwo address wires parallel connection of value Electrically erasable programmable ROM is connected in time data application module；There are two types of apply for time data application module tool Form：When application power-factor measurement method of the present invention power-factor measurement device be applied to accuracy of measurement require compared with During low common survey occasion, the time data application module in measuring device is using measurement type time data application module, dress Put referred to as measurement type power-factor measurement device；When the power-factor measurement device quilt of application power-factor measurement method of the present invention During applied to measuring occasion to the more demanding AC energy of accuracy of measurement (electric degree), the time data application in measuring device Module uses metering type time data application module, and device is known as metering type power-factor measurement device；In order to sharpen understanding, with Lower combination power system frequency is that the example of 50HZ is further described in detail.

A kind of single-phase power factor measuring method of power frequency includes a power factor and calculates formula, calculated by the formula Obtain data and the method data organization into applications such as conversion table, deposit memories, step：

(1) according to electrotechnics knowwhy, the voltage of same phase and the phase difference of electric current or phase angle difference withIt represents, only Time difference t (us) and cycle T or f are measured, phase angle can be obtained, i.e.,：

Phase difference or phase angle differenceCosine be power factor, i.e.,：

In (1) above, (2) two formulas, t (us) is the time difference sampled time difference count value in other words；T For the period,F is mains frequency (hertz/sec)；

F f during rated frequency_r(hertz/sec) represents, T T_rIt represents, t (us) is still represented with t, then rated frequency When the voltage of same phase and the phase difference of electric current or phase angle differenceFor：

Phase difference or phase angle difference during rated frequencyCosine can also be expressed as following formula, i.e. power factor calculate it is public Formula (time unification in formula is microsecond), when rated frequency is 50HZ, then has：

(2) single-phase power factor of power frequencyIn0~90 ° is taken, is corresponded toRadian is specified frequency Rate f_rWhen a cycle T_rA quarter, i.e.,In formula, T_rPeriod time value when being rated frequency；Setting Electric system rated frequency is f_rWhenInIt is changed to by 0The Hus times are needed, then Time t value by 1us, by be incremented by 1us every time, until until 5000us, substitute into power factor one by one respectively and calculate public affairs T in formula (4) is calculated 5000Value, this 5000Value be all comprising four after decimal point Numerical value；5000 obtainedValue Data according to time t value ascending sequential organization into time t value and power Factor value conversion table, referred to as " conversion table "；

(3) until the time t value that 16 bits represent plays 5000us from 1us, successively as memory Address and correspondingly 5000 in conversion table4 bit digitals use four binary coded decimals after the decimal point of value Binary-coded decimal deposit memory storage unit in, memory is using electrically erasable programmable ROM EEPROM2864, one Each storage unit of memory is a byte, can store 2 four binary coded decimal binary-coded decimals namely 2 decimal systems Number, the storage unit of two bytes store 4 decimal numbers, use the memory of two 8K × 8, in order, first storage Device stores oneFront two after the decimal point of value in 4 ten's digits, second memory store oneLatter two after the decimal point of value in 4 ten's digits；Wherein, the t values in conversion table are 0th~31 correspondingIt is 1.0000 to be worth, and is all changed to after 0.9999 in the storage unit of 4-digit number deposit appropriate address after decimal point； What is finally shown in this way is all the numerical value after decimal point, need not just consider further that the setting of decimal point, simplify circuit；Although Error can be brought, but the error can receive by being changed to 0.9999 1.0000；

The power-factor measurement device of one application this method, and two signals of voltage and current of measuring device input It is that the measurement voltage of respectively same phase, the secondary current of current transformer are converted by resistance and by electronic circuit Filter out harmonic wave interference processing sinusoidal voltage waveform signal, referred to as voltage transformer, current transformer quadratic sine wave Shape signal, including first, second, third and fourth circuit unit, the 12nd circuit unit and a time data application module, with BCD 5000 in code form storage conversion tableThe electrically erasable programmable ROM connection of two address wire parallel connections of value In time data application module；There are two types of application forms for time data application module tool：When using power factor of the present invention When the power-factor measurement device of measuring method is applied to require relatively low common survey occasion to accuracy of measurement, dress is measured For time data application module in putting using measurement type time data application module, device is known as measurement type power-factor measurement dress It puts；When application power-factor measurement method of the present invention power-factor measurement device be applied to it is more demanding to accuracy of measurement AC energy (electric degree) metering occasion when, the time data application module in measuring device uses metering type time data application Module, device are known as metering type power-factor measurement device；

As shown in Fig. 2, wherein, the circuit structure of first and second circuit unit, component and its parameter are identical, are handles Voltage, the Current Transformer Secondary sine wave-shaped signal of input are converted into the circuit of the square-wave signal output of Transistor-Transistor Logic level respectively, Its input voltage, Current Transformer Secondary sine wave-shaped signal respectively via the forward voltage in first and second circuit unit with With voltage comparator of the device access with open-loop gain and it is followed by Transistor-Transistor Logic level conversion interface circuit.Measurement voltage transformer Quadratic sine waveform signal is input to the 1 of the first circuit unit_INEnd, the quadratic sine waveform signal of Verification of Measuring Current Transformer are defeated Enter 1 to second circuit unit_INEnd；The output terminal of first and second circuit unit is then respectively the rectangular wave for the Transistor-Transistor Logic level being converted into Signal is divided into the output of three tunnels：The signal output of first circuit unit is divided into three tunnels, is input to the 1 of the 4th circuit unit all the way_INEnd That is U₁₀1_INEnd is input to the 4 feet i.e. U of the 4th circuit unit all the way₁₁4 feet, be also input to the 12nd circuit unit all the way In register U₁₆The 3rd foot；The signal output of second circuit unit is divided into three tunnels, is input to the 4th circuit unit all the way 2_INEnd is U₁₁2_INEnd is input to the 3 feet i.e. U of the 4th circuit unit all the way₁₀3 feet, be also input to the 12nd circuit all the way Register U in unit₁₆The 5th foot；

First circuit unit is included by the use of amplifier OP-07 as forward voltage follower U₁, by the use of OP-37 as with open loop increase The voltage comparator U of benefit₄, resistance R₄、R₅、R₈、R₉, capacitance C₁, diode D₁、D₂, further included U₆And U₈, U₆And U₈Have respectively A gate circuit in 42 input nand gate 74LS132 of Schmidt trigger, connection be, voltage transformer it is secondary just String waveform signal accesses U₁In-phase input end i.e. 1_INEnd, U₁Inverting input be connected with its output terminal, U₁Output terminal and Resistance R₄One end be connected, R₄The other end and U₄In-phase input end be connected, resistance R₅The other end and U₄Reverse phase it is defeated Enter end i.e. 2_INEnd feet is connected, U₄Output terminal and resistance R₈One end be connected, R₈The other end and R₉One end be connected, R₉The other end connection simulation ground, capacitance C₁And R₉Parallel connection, C₁And R₉Parallel connection access uses the filter capacity that can enhance circuit, R₈'s The other end is also and U₆Two input terminals be connected, diode D₁Input terminal and U₆Two input terminals be connected, D₁Output terminal Connection+5V, D₂Output terminal connection D₁Input terminal, D₂Input terminal connection digitally, U₆Output terminal and U₈Two input End is connected, U₈Output terminal be the first circuit unit output terminal, output terminal respectively with the 4th circuit unit U₁₀1_INEnd, U₁₁4 feet and the 12nd circuit unit in U₁₆The 3rd foot be connected；

Second circuit unit is included by the use of amplifier OP-07 as forward voltage follower U₃, by the use of OP-37 as with open loop increase The voltage comparator U of benefit₅, resistance R₆、R₇、R₁₀、R₁₁, capacitance C₂, diode D₃、D₄, further included U₇And U₉, U₇And U₉It is respectively Have a gate circuit in 42 input nand gate 74LS132 of Schmidt trigger, connection is, current transformer it is secondary Sine wave-shaped signal accesses U₃In-phase input end i.e. 1_INEnd, U₃Inverting input be connected with its output terminal, U₃Output terminal With resistance R₆One end be connected, R₆The other end and U₅In-phase input end be connected, resistance R₇The other end and U₅Reverse phase Input terminal i.e. 2_INEnd feet is connected, U₅Output terminal and resistance R₁₀One end be connected, R₁₀The other end and R₁₁One end be connected It connects, R₁₁The other end connection simulation ground, capacitance C₂And R₁₁Parallel connection, C₂And R₁₁Parallel connection access uses the filtering energy that can enhance circuit Power, R₁₀The other end also and U₇Two input terminals be connected, diode D₃Input terminal and U₇Two input terminals be connected, D₃Output terminal connection+5V, D₄Output terminal connection D₃Input terminal, D₄Input terminal connection digitally, U₇Output terminal and U₉'s Two input terminals are connected, U₉Output terminal be second circuit unit output terminal, output terminal respectively with the 4th circuit unit U₁₁2_INEnd, U₁₀3 feet and the 12nd circuit unit in U₁₆The 5th foot be connected；

As shown in Fig. 2, third circuit unit is a zero-point voltage adjustment circuit unit, including being made with amplifier OP-07 For voltage follower U₂, adjustable resistance R₁, resistance R₂、R₃, connection is adjustable resistance R₁One end connection+15V, the other end connect Meet -15V, R₁Adjustable end connection R₂One end, R₂The other end connection R₃One end, R₃The other end connection simulation ground, R₂ The other end and U₂In-phase input end be connected, U₂Inverting input and U₂Output terminal be connected, U₂Output terminal be divided into Two-way, all the way with the first circuit unit R₅One end be connected, R₅The other end and U₄Inverting input i.e. 2_INIt is connected, separately All the way with second circuit unit R₇One end be connected, R₇The other end and U₅Inverting input i.e. 2_INIt is connected；

As shown in Fig. 2, the 4th circuit unit is by 42 inputs and an AND gate circuit U in door integrated circuit 74LS08₁₀With 42 input or door integrated circuit 74LS32 in an OR circuit U₁₁It forms, there are four input terminals 1_IN、2_IN, 3 feet, 4 feet With two output terminals 1_OUTWith 2_OUT, the 4th circuit unit input terminal 1_INIt is U₁₀Input terminal 1_IN, the 4th circuit unit input terminal 3 feet are U₁₀3 foot of input terminal, the 4th circuit unit input terminal 2_INIt is U₁₁Input terminal 2_IN, the 4th circuit unit input terminal 4 feet are U₁₁4 foot of input terminal, two output terminals are respectively U₁₀Output terminal 1_OUTAnd U₁₁Output terminal 2_OUT；

The connection of four input terminals of the 4th circuit unit is U₈Output terminal and U₁₀Input terminal 1_INAnd U₁₁4 feet It is connected；U₉Output terminal and U₁₁Input terminal 2_INAnd U₁₀3 feet be connected；

As shown in Fig. 3 or Fig. 5, two output terminals of the 4th circuit unit are there are two types of connection, as shown in figure 3, when the 4th electricity When road unit application is in the measuring device using measurement type time data application module, connection is, the 4th circuit unit U₁₀Output terminal 1_OUTWith four sequentially connected U in the 8th circuit unit₃₁、U₃₂、U₃₃、U₃₄The 11st foot, i.e. CP ends are connected It connects, the 4th circuit unit U₁₁Output terminal 2_OUTIt is divided into three tunnels, it is sequentially connected with four in the 6th circuit unit respectively U₂₅、U₂₆、U₂₇、U₂₈The 1st foot, i.e.End be connected and the 8th circuit unit in four sequentially connected U₃₁、U₃₂、U₃₃、 U₃₄The 1st foot, i.e.End is connected and input terminal, the i.e. U of pulse-delay unit in the 12nd circuit unit₂₁1,2 foot phases Connection；

As shown in figure 5, when the 4th circuit unit is applied in the measuring device using metering type time data application module When, connection is, the 4th circuit unit U₁₀Output terminal 1_OUTWith a gate circuit U in 74LS86 XOR gates₁₀₁1 foot phase Connection, the 4th circuit unit U₁₁Output terminal 2_OUTIt is divided into three tunnels, respectively and U₁₀₁2 feet be connected and microcontroller 8031, i.e. U₁₀₂'sThat is the 13rd foot is connected and input terminal, the i.e. U of pulse-delay unit in the 12nd circuit unit₂₁1,2 feet It is connected；

As shown in Fig. 2, the 12nd circuit unit be one with LED light come indicated horsepower factor is advanced, circuit of lag, Mainly include a U₁₆, i.e. two gate circuit U in 4 bidirectional shift register 74LS194,74LS04 phase inverters₁₃、U₁₄, limit Leakage resistance R₁₂、R₁₃, the advanced green LED LED light D of an instructed voltage₅, the advanced red hair of an indicator current Optical diode LED light D₆With resistance R₁₄, capacitance C₃An and pulse-delay unit；The pulse-delay unit is the 4th circuit unit U₁₁ Output terminal 2_OUTIt is input to U again after the delay of the signal of output slightly microsecond₁₆11 feet, i.e. CP ends, to intercept voltage, electric current Precedence in the two signal is that can determine whether and make advanced or lag red, green lamplight pointing, first device of pulse-delay unit Part includes, 42 input or door integrated circuit 74LS32 in a gate circuit U₂₁, the input nor gate integrated circuits of 74L,S02 42 In two gate circuit U₂₃、U₂₄, a gate circuit U in 74LS04 hex inverter integrated circuits₂₂With resistance R₁₆, capacitance C₅；Arteries and veins Rushing the connection of delayer is, U₁₁Output terminal 2_OUTAnd U₂₁1,2 feet be connected, U₂₁3 foot of output terminal and phase inverter U₂₂It is defeated Enter end and resistance R₁₆One end be connected, U₂₂Output terminal and U₂₄2 feet be connected, R₁₆The other end and U₂₃1 foot and electricity Hold C₅One end be connected, C₅The other end connection digitally, U₂₃2 feet and U₂₄3 foot of output terminal be connected, U₂₃Output terminal 3 feet and U₂₄1 foot be connected, U₂₄3 foot of output terminal be pulse-delay unit output terminal, be connected to U₁₆11 feet, i.e. CP End；

In addition, the U in the 12nd circuit unit₁₆3 feet and U₈Output terminal be connected, U₁₆5 feet and U₉Output terminal It is connected, U₁₆1,9,10 feet and resistance R₁₄One end be connected, R₁₄The other end be connected with+5V, R₁₄One end also and electricity Hold C₃One end be connected, C₃The other end connection digitally, U₁₆15 feet and U₁₃Input terminal be connected, U₁₃Output terminal and The advanced green LED LED light D of instructed voltage₅Cathode be connected, D₅Anode pass through resistance R₁₂It is connected with+5V It connects, U₁₆13 feet and U₁₄Input terminal be connected, U₁₄Output terminal and the advanced red light emitting diodes LED light of indicator current D₆Cathode be connected, D₆Anode pass through resistance R₁₃It is connected with+5V；

12nd circuit unit comes that indicated horsepower factor is advanced, simplified process of lag work is using LED light：Such as Fig. 2 And shown in the oscillogram of A, D, F point in Fig. 6, U₁₁Output terminal 2_OUTThe voltage of output, the rectangular wave of electric current synthesis are through extra pulse Delayer slightly postpone after in its output terminal i.e. U₂₄3 foot of output terminal output be the square waveform for postponing only to count microsecond, when super Preceding voltage rectangular waveform is by U₈Output terminal reach U₁₆3 foot when, while by U₁₁Output terminal 2_OUTThe square waveform warp of output After pulse-delay unit delay U is output to from its output terminal₁₆11 feet, that is, CP end feets, before the square waveform of the slight delay Rising edge is the voltage rectangular waveform signal reached slightly before by U₁₆3 feet be sent to U₁₆15 feet, the voltage rectangular wave of high level Shape signal makes phase inverter U₁₃Low level is exported, so as to light the advanced green LED LED light D of instructed voltage₅Although Electric current rectangular waveform signal may slightly late after will be by U₉Output terminal reach U₁₆5 feet, but be later than U₁₆CP end feets On delay pulse, thus represent current power factor be lag；When electric current is ahead of voltage, the course of work That equally, but in circuit light is red diode D₆, there is shown current power factor is advanced；

As shown in figure 3, the 5th circuit unit is 10MHZ pulses generations and ten frequency dividing circuits, which includes 10MHZ Crystal oscillator, 74LS04 hex inverters U₃₀, 74LS160 decimal system coincidence counters U₂₉, resistance R₁₇、R₁₈、R₁₉, capacitance C₆, Connection is U₃₀The 1st, connection resistance R between 2 feet₁₈, R is connected between the 3rd, 4 feet₁₉, C is connected between the 2nd, 3 feet₆, the 1st, 4 feet Between connect 10MHZ crystal oscillators, the 2nd foot and the 13rd foot be connected, the 12nd foot and decimal system coincidence counter U₂₉The 2nd foot CP ends are connected, U₂₉The foot of the 1st, 7,9 and 10 pass through resistance R₁₇It is connect with+5V power supplys, the 15th foot exports 10MHZ through ten frequency dividings 1MHZ pulses afterwards are 1 pulse that is, per microsecond, U₂₉The output of the 15th foot be connected to four synchronometers of the 6th circuit unit The 2nd foot, the i.e. CP ends of number device；

As shown in figure 3, the 6th circuit unit is by four 74LS161 tetrad coincidence counters U₂₅、U₂₆、U₂₇、U₂₈ One to be connected in sequence, 16 binary time pulse counting circuits, output are one and are passed by zero, every time Increase 16 bits of 1us, first, i.e. U, left side in four counters₂₅The 14th foot be output 16 binary systems Lowest order in number, first, i.e. U, right side in four counters₂₈The 11st foot be output 16 bits in Highest order, connection are U₂₅The 15th foot connection U₂₆The 10th foot, U₂₆The 15th foot connection U₂₇The 10th foot, U₂₇The 15th Foot connects U₂₈The 10th foot, the 2nd foot CP ends of four counters and U₂₉The 15th foot be connected, four counters the 7th, 9 feet And U₂₅The 10th foot pass through resistance R₁₇It is connected with+5V power supplys, the 1st foot of four countersEnd and the 4th circuit unit U₁₁ Output terminal 2_OUTIt is connected, four counters connect one to one to the 8th circuit unit 16 of totally 16 data output ends Data input pin, i.e., U₂₅、U₂₆、U₂₇、U₂₈Each counter the 14th, 13,12,11 feet correspond access U successively₃₁、U₃₂、 U₃₃、U₃₄Each register the 3rd, 4,5,6 feet；

As shown in figure 3, the 7th circuit unit is a holding impulse circuit, by the inputs of 74L,S08 42 and door U₃₅In one A AND gate circuit is formed；The holding impulse circuit is that temporary sampling time data are at least kept a 20ms, i.e. cycle Time, keeping the condition of the setting of impulse circuit is,Kept for the time that pulse occurs should be at time counting circuit startup Between 5000us to 10ms after counting and as close to this side of 5000us,Hardware used when the holding pulse is set It is few as possible；Decimal number 5120 is selected after relatively according to aforementioned condition, setting method is that decimal number 5120 is converted Into binary number, i.e. 0001,0100,0000,0000, after time counting circuit starts the 11st, 13 of the binary number it is same When represent that count value is decimal numeral 5120 when there is high level；Its connection is U₃₅1 foot and the 6th circuit unit export 16 bits in the 11st, i.e. U₂₇12 feet be connected, U₃₅2 feet and 16 bits in the 13rd, i.e. U₂₈14 feet be connected, U₃₅3 feet as the 7th circuit unit output terminal the after time counting circuit starts and counts It is generated during 5120us and exports holding pulse, pulse input to the CP ends of four registers of the 9th circuit unit；

As shown in figure 3, the 8th circuit unit is four to be incorporated to-and 74LS194 i.e. 4 bi-directional shift that works in a manner of going out Register U₃₁、U₃₂、U₃₃、U₃₄The time data buffering circuit being in turn connected into, 4 bidirectional shift registers can also use The IC chips such as eight d type flip flops replace, and connection is four counters totally 16 data output of the 6th circuit unit End connects one to one to 16 data input pins of the 8th circuit unit, i.e., U₂₅、U₂₆、U₂₇、U₂₈The of each counter 14th, 13,12,11 feet correspond access U successively₃₁、U₃₂、U₃₃、U₃₄Each register the 3rd, 4,5,6 feet；Four registers 16 data input pins of totally 16 data output ends and the 9th circuit unit one-to-one correspondence is connected, i.e., U₃₁、U₃₂、U₃₃、U₃₄ Each register the 15th, 14,13,12 feet correspond access U successively₃₆、U₃₇、U₃₈、U₃₉The 3rd, 4,5, the 6 of each register Foot；Four register U₃₁、U₃₂、U₃₃、U₃₄The 9th, 10 feet connection resistance R₂₀One end, resistance R₂₀The other end and+5V power supplys Connection, R₂₀One end pass through capacitance C₇Connection is digitally；Four register U₃₁、U₃₂、U₃₃、U₃₄The 1st footEnd and the 4th electricity The U of road unit₁₁Output terminal 2_OUTIt is connected；Four register U₃₁、U₃₂、U₃₃、U₃₄The 11st foot CP ends and the 4th circuit unit U₁₀Output terminal 1_OUTIt is connected；

As shown in figure 3, the 9th circuit unit is four to be incorporated to-and 74LS194 i.e. 4 bi-directional shift that works in a manner of going out Register U₃₆、U₃₇、U₃₈、U₃₉The time data holding circuit being in turn connected into, 4 bidirectional shift registers can also use The IC chips such as eight d type flip flops replace, and connection is four register U₃₆、U₃₇、U₃₈、U₃₉The 1st footEnd, 9, 10 feet and resistance R₂₀One end be connected, R₂₀The other end connected with+5V power supplys, R₂₀One end pass through capacitance C₇Connection number Ground；11st foot CP ends of four registers and output terminal, the i.e. U of the 7th circuit unit₃₅3 feet be connected；Four registers Preceding 13 output terminals in 16 data output ends, i.e. from U₃₆The 15th foot rise, according to priority, the 14th, 13,12 feet, connect down It is U₃₇The 15th, 14,13,12 feet, then it is U to connect down₃₈The 15th, 14,13,12 feet, be finally U₃₉The 15th foot, respectively successively With the tenth circuit unit, i.e. first memory U₄₀, second memory U₄₁13 address wire A in parallel₀~A₁₂It corresponds It is connected；

As shown in figure 4, the tenth circuit unit is arranged to 8K × 8 of two address wire parallel connections of read-only working method Electrically erasable programmable ROM EEPROM2864, first memory U₄₀With second memory U₄₁13 address wires It is in parallel and sequentially correspond and be connected with 13 data output ends before the 9th circuit unit, two Memory Storage Units In 5000 in the form of four binary-decimal binary-coded decimals in deposit conversion tableValue；Its connection is first A memory U₄₀With second memory U₄₁The 20th, 22 feet pass through resistance R₂₁It connects digitally, first memory U₄₀With Two memory U₄₁The 27th foot pass through resistance R₂₂Connection+5V power supplys, first memory U₄₀With second memory U₄₁It is in parallel 13 address wire A₀~A₁₂Successively in 16 data output ends of the 9th circuit unit before 13 output terminals, i.e. U₃₆、 U₃₇、U₃₈15,14,13,12 feet and U₃₉15 feet one-to-one correspondence be connected, first memory U₄₀With second memory U₄₁ The data output end mouth line I/O of two memories₀~I/O₇It is connected with the 11st circuit unit for totally 16 articles；

As shown in figure 4, the 11st circuit unit is using BCD- seven-segment decoders/driver, current-limiting resistance, seven sections of LED The display circuit that digital display etc. commonly uses device composition carrys out the power factor that instant playback is testedValue, in the present embodiment In be by 74LS47 i.e. BCD- seven-segment decoders/driver U₄₂、U₄₃、U₄₄、U₄₅, current-limiting resistance R₂₃×7、R₂₄×7、R₂₅×7、 R₂₆× 7, seven sections of common-anode LED digital displays U₄₆、U₄₇、U₄₈、U₄₉Digital display circuit is formed, with the tenth circuit unit First memory U of two address wire parallel connections₄₀With second memory U₄₁Data output end mouth line I/O connection method It is U₄₀Data output end mouth line the 11st, 12,13,15 feet, i.e. I/O₀、I/O₁、I/O₂、I/O₃Successively and U₄₂7,1,2,6 feet It is connected, exports and in U₄₆Upper two memories that address wire parallel connection is shown totally two store the stored in bytes One ten's digit, U₄₀Data output end mouth line the 16th, 17,18,19 feet, i.e. I/O₄、I/O₅、I/O₆、I/O₇Successively and U₄₃ 7,1,2,6 feet be connected, export and in U₄₇Totally two storage words of upper two memories that address wire parallel connection is shown Second ten's digit stored in section, U₄₁Data output end mouth line the 11st, 12,13,15 feet, i.e. I/O₀、I/O₁、I/O₂、 I/O₃Successively and U₄₄7,1,2,6 feet be connected, export and in U₄₈Upper two memories that address wire parallel connection is shown The third ten's digit stored in totally two storage bytes, U₄₁Data output end mouth line the 16th, 17,18,19 feet, i.e. I/ O₄、I/O₅、I/O₆、I/O₇Successively and U₄₅7,1,2,6 feet be connected, export and in U₄₉Address wire parallel connection is above shown The 4th ten's digit stored in two storage bytes of two memories；U₄₂、U₄₃、U₄₄、U₄₅With current-limiting resistance R₂₃× 7、R₂₄×7、R₂₅×7、R₂₆× 7 and seven-segment numeric indicator U₄₆、U₄₇、U₄₈、U₄₉Connection belong to knowledge.

It is above-mentioned using the measuring device of measurement type time data application module, i.e. measurement type power as shown in Fig. 2,3,4,6 Its brief course of work of factor measuring device is, when from the first circuit unit voltage follower U₁In-phase input end 1_INInput, And again from U₁Output terminal output voltage sinusoidal waveform signal A-1 be converted into TTL rectangular waveform signals from U₈Output terminal it is defeated Go out to U₁₀1_IN、U₁₁4 feet, U₁₆3 foot while, from U₁₁Output terminal 2_OUTAlso output high level square-wave signal is to the 1 foot of six counters of circuit unit four, 1 foot and U of four registers of the 8th circuit unit₂₁1,2 feet, the 6th circuit unit It starts counting up, the 8th circuit unit time data are kept in, the delay of pulse-delay unit time started；Then from second circuit list First voltage follower U₃In-phase input end 1_INIt inputs and again from U₃Output terminal output current sinusoidal waveform signal A-2 quilts TTL rectangular waveform signals are converted into from U₉Output terminal be output to U₁₀3 feet, U₁₁2_IN、U₁₆5 foot while, from U₁₀It is defeated Outlet 1_OUTHigh level square-wave signal is exported to four the 11st feet of register of the 8th circuit unit, i.e. CP ends, utilizes U₁₀Output The preceding rising edge of high level rectangular wave is the 8th circuit unit U₃₁、U₃₂、U₃₃、U₃₄Totally 16 data input pins on time number The 9th circuit unit U is delivered to according to being sent on its 16 data-out ports or saying₃₆、U₃₇、U₃₈、U₃₉Totally 16 data it is defeated Enter on end, as the 5120us after the 6th circuit unit, i.e. time pulse-scaling circuit starts, the output of the 7th circuit unit End, i.e. U₃₅The output of 3 feet keep pulse to the 9th circuit unit U₃₆、U₃₇、U₃₈、U₃₉The 11st foot, i.e. CP ends, utilize U₃₅3 Foot output keeps the preceding rising edge of the high level of pulse the 9th circuit unit U₃₆、U₃₇、U₃₈、U₃₉Totally 16 data input pins On time data be sent on its data-out port and keep an i.e. 20ms of cycle, due to this 16 numbers of the 9th circuit unit According to two addresses for being arranged to read-only working method of 13 data output ends and the tenth circuit unit before in output port The read-only first memory U of electro erasible programmable of 8K × 8 of line parallel connection₄₀With second memory U₄₁13 address wires It sequentially corresponds and is connected, i.e. U₃₆In first memory U of 15,14,13,12 feet and two memories₄₀It is deposited with second Reservoir U₄₁13 address wires in parallel in A₀、A₁、A₂、A₃It sequentially corresponds and is connected, U₃₇In 15,14,13,12 feet With the A in 13 address wires in parallel₄、A₅、A₆、A₇It sequentially corresponds and is connected, U₃₈In 15,14,13,12 feet and parallel connection 13 address wires in A₈、A₉、A₁₀、A₁₁It sequentially corresponds and is connected, U₃₉In 15 feet and 13 address wires in parallel in A₁₂Correspondence is connected, and two memories, first memory U₄₀With second memory U₄₁Storage unit in adopted With 5000 in the form deposit conversion table of four binary-decimal binary-coded decimalsValue, be sent to so being kept pulse 9th circuit unit U₃₆、U₃₇、U₃₈、U₃₉16 data-out ports on time data just become the tenth circuit unit two First memory U of memory of address wire parallel connection₄₀With second memory U₄₁Address and directly read its respective stored list Power factor value in member realizes the measurement to power factor；While almost start-up operation with the six, the eight circuit units, 12nd circuit unit with LED light come indicated horsepower factor is advanced, work of lag is also carrying out, simplified process is as before It is described.It is above-mentioned it is described be voltage leading current situation, if its course of work is during the situation of electric current leading voltage The same, only the color of indicator light becomes red, shows that the power factor when electric current leading voltage is advanced. It is very that the power factor value measured by measurement type power-factor measurement device is applied in the case of power grid rated frequency 50HZ Accurately.

It is well known that the mains frequency in actual motion is unlikely to be stable, its meeting generation technology specification permits Perhaps deviation.According to pertinent regulations, standard frequency range should be rated frequency f to measurement with class of accuracy_r99%~101%, That is 0.99f_r≤f≤1.01f_r, rated frequency f should be with class of accuracy to protection_r96%~102%, i.e. 0.96f_r≤f≤ 1.02f_r.Therefore when mains frequency is deviated power factor value is measured using measurement type power-factor measurement device also just Can generate certain error, this error for common instrument measurement and display and for scene power factor controlling and Power factor compensation is completely adequate；But it is counted applied to the AC energy (electric degree) more demanding to accuracy of measurement It is unallowable it is necessary to use metering type power-factor measurement device, the time data application mould in device when measuring occasion Block uses metering type time data application module.

When mains frequency shifts, mains frequency f f when deviating_cy(hertz/sec) represents, T T_cyIt represents, T (us) uses t_cy(us) it represents, then the voltage of same phase and the phase difference of electric current or phase angle difference when mains frequency deviatesFor：

In the formula (3) being generally noted above,

Remove the item of the rightmost in (3), that is, have：

When mains frequency f is rated frequency f_rWhen, the T in (3-1)_rIt is one and the rated frequency f in (3)_rIt is corresponding Rated value,It is also one and f_rCorresponding rated value, therefore the t in (3), (3-1) two formulas withIt is directly proportional, this " time t value and the power factor value conversion table " of embodiment be exactly according to frequency be rated for 50HZ and it is constant under conditions of calculate Come, so in the respective memory unit read when mains frequency is 50HZ by storage address of tIt is worth also just It is accurate；

In formula (5), the mains frequency f when offset in actual motion_cyFor 50HZ but with rated frequency f_rThere are rule During the deviation allowed surely, T_cySimilarly and T_rThere is deviation, thenTogetherBetween also have deviation, it is assumed that (3-1) and (5) inIt is identical, then two formulas the right is equal：

From (3-2) formula it is clear that working asTogetherWhens not waiting, t and t_cyValue it is also unequal, use at this time t_cyIt goes to extract as the time t value in " time t value and the power factor value conversion table " worked out when being 50HZ according to rated frequency It is corresponding in tableIt value or says and still uses t_cyIt goes to read in memory respective memory unit as storage addressAlso will appear error in data during value certainly because the storage content in the memory be according to rated frequency be 50HZ when What the data in " time t value and the power factor value conversion table " of establishment stored.

This mistake can be corrected using following straightforward procedure：The same phase voltage and the phase of electric current sampled immediately Potential difference or phase angle differenceIt removes when rated frequency 50HZThen using obtained t as " time t value and power because Time t value in numerical value conversion table " is gone corresponding in extraction tableValue；Either direct wushu (3-2), which become, to be got in return To t, then go to read using t as storage address and be deposited according to what the data in " time t value and power factor value conversion table " stored In reservoir respective memory unitValue；Whether any method, result are the same, i.e.,：

Above formula (6) obtains a phase angle when mains frequency being shown to deviateRequired sampling time t_cyBy's After adjustment " is converted " in other words, an identical phase angle is just obtainedThe required sampling time when mains frequency is specified T, finally gone using sampling time value t as storage address read memory according to power grid rated frequency 50HZ when work out " time t value with power factor value conversion table " and its data is stored in advance in respective memory unitDuring value Error in data would not occur；In formulaReferred to as conversion factor or commutation factor, work as T_cy=T_rWhen, mains frequency is volume Determine frequency, conversion factor is equal to 1.It now gives a concrete illustration, for example, the time difference sampled in mains frequency 50.5HZ is 1000us should can with the aforedescribed process carry out error correction：(1) period known to during 50.5HZ is 19801.9802us, application Formula (5) acquires angular differenceIt is 18.18 °, and period during known 50HZ is 20000us, the angle of each us is 0.018 °, This phase angle difference18.18 ° removal in 0.018 °, obtained t is 1010us, using the 1010us as mains frequency for 50HZ when Time t value in " time t value and the power factor value conversion table " of establishment is gone corresponding in extraction tableThe result being worth to It is accurate, it is clear that if directly going to extract in the table with 1000usValue will obtain the result of mistake；(2) has been Know that period during 50.5HZ is 19801.9802us, period during 50HZ is 20000us, be adjusted using formula (6) or The t that saying is to obtain after " conversion " is 1010us, then goes to read memory using the time value t after the correction as storage address According to mains frequency be 50HZ when " time t value and the power factor value conversion table " worked out and its data is prestored In respective memory unitWould not occur error in data during value.

The measuring device input of the present invention is that the measurement voltage of same phase, Current Transformer Secondary electric current pass through resistance The sinusoidal voltage waveform signal being converted into and by electronic circuit for filtering out harmonic wave interference processing, respectively by device The processing of third circuit unit, that is, zero-point voltage adjustment circuit and first and second circuit unit waveform changing circuit, a sine wave Shape signal is divided into equal upper and lower two half-waves and is exported with rectangle square wave, the high level of the rectangle square wave, i.e. positive pulse portion Divide essentially equal in time with low level, i.e. zero level part, that is to say, that the time of its high and low level respectively accounts for a cycle The half of time, therefore to cycle time T in apparatus of the present invention_rAnd T_cyMeasurement all only measure its rectangle square wave height electricity Flat, i.e. positive pulse part, hereinafter or in the operation that is related to just no longer separately to be explained in addition to being described；According to preceding The standard frequency variation range that the regulation stated allows is it is found that its maximum frequency range is rated frequency f_r96%~ 102%, when mains frequency be rated frequency 50HZ when its corresponding half period time value T_rFor 10000us, when power grid frequency Rate shift variation when its corresponding half period time value T_CYAllow variation maximum magnitude in 9804~10417us Between.A bit is needed to add explanation, t and t referred to above_cyIt is meant that when as sampling or the time value counted The same, one is the time value of sampling or counting when representing rated frequency, the other is when representing rated frequency offset Sampling or the time value counted, the difference is that t also has the function of to represent address code in conversion table and memory, therefore One represents that another marks t to carry bottom right to mark t without bottom right_cyTo represent.

It is applied to the power factor of the more demanding occasion to accuracy of measurement according to error correction method discussed above design Metering type time data application module in measuring device, the module are included in 42 input XOR gate integrated circuit 74LS86 One gate circuit U₁₀₁, the microcontroller 8031 that its a piece of clock crystal oscillator frequency is 12MHZ is U₁₀₂, three 7,4LS,377 eight Rising edge d type flip flop U₁₀₃、U₁₀₄、U₁₀₅, wherein the 1st is U₁₀₄, the 2nd be U₁₀₅, the 3rd be U₁₀₃, stored in the form of binary-coded decimal 5000 in conversion tableMemory EEPROM2864, that is, U of two address wire parallel connections of value₄₀、U₄₁, wherein first A memory is U₄₀, second memory is U₄₁, microcontroller U₁₀₂Pass through P₀Mouth extends delivery outlet, is using three 74LS377 U₁₀₃、U₁₀₄、U₁₀₅With first memory U of two address wire parallel connections₄₀, second memory U₄₁It is attached, herein U₁₀₃、U₁₀₄、U₁₀₅It is considered as the external RAM unified addressing of microcontroller, microcontroller U₁₀₂Exporting control signal isWhat it was used Software can refer to " MCS-51 series monolithic Practical Interfaces technology publishing house of Li Hua chief editors BJ University of Aeronautics ＆ Astronautics of page 86 Introduction in August, 1993 ", the specific connection of circuit are：4th circuit unit U₁₀Output terminal 1_OUTWith XOR gate U₁₀₁'s 1st foot is connected, the U of the 4th circuit unit₁₁Output terminal 2_OUTWith XOR gate U₁₀₁The 2nd foot and microcontroller U₁₀₂'sThat is the U of the 13rd foot and the pulse-delay unit in the 12nd circuit unit₂₁Two input terminals 1,2 feet be connected, exclusive or Door U₁₀₁The 3rd foot and microcontroller U₁₀₂'sI.e. the 12nd foot is connected, microcontroller U₁₀₂P0 mouth lines 8 end feets by compile It is number ascending, i.e. by the sequence of P0.0 to P0.7 sequentially correspondingly with the 1st eight rising edge d type flip flop U₁₀₄8 numbers It is connected according to input terminal 1D~8D, the 1st eight rising edge d type flip flop U₁₀₄8 data output end 1Q~8Q correspondingly and 2nd eight rising edge d type flip flop U₁₀₅8 data input pin 1D~8D be connected, the 3rd eight rising edge d type flip flop U₁₀₃8 A data input pin 1D~8D sequentially correspondingly with the 1st eight rising edge d type flip flop U₁₀₄8 data input pin 1D~ 8D parallel connections are connected, the 3rd eight rising edge d type flip flop U₁₀₃8 data output end 1Q~8Q and first memory U₄₀It is low The address wire end feet of eight is ascending by number, is sequentially attached correspondingly by the sequence of A0 to A7, the 2nd eight Rising edge d type flip flop U₁₀₅8 data output ends in 1Q~5Q and first memory U₄₀The address wire end feet of high five It is ascending by number, be sequentially attached correspondingly by the sequence of A8 to A12, due to first memory of memory U₄₀With second memory U₄₁Its memory capacity only has 8K, the 2nd eight rising edge d type flip flop U₁₀₅8 data output ends in Three end feet 6Q~8Q are there remains, vacant can not be had to；Microcontroller U₁₀₂The 16th foot, i.e.End feet and three eight rising edge D Trigger U₁₀₃、U₁₀₄、U₁₀₅The 11st foot, i.e. CP end feets be connected, microcontroller U₁₀₂27th foot, i.e. P2.6 end feets and the 1st eight Rising edge d type flip flop U₁₀₄The 1st foot, i.e.End feet is connected, microcontroller U₁₀₂28th foot, i.e. P2.7 end feets while and the 2nd, 3 A eight rising edges d type flip flop U₁₀₅、U₁₀₃The 1st foot, i.e.End feet is connected, second memory U₄₁Address wire end feet A0~ A12 and first memory U₄₀Address wire end feet A0~A12 carry out connection in parallel correspondingly；Set microcontroller U₁₀₂ The output of P0 mouths two bytes 16 bits address date be arranged in order from lowest order to highest order, points two It is secondary, a byte is sent to 8 data input pins of eight rising edge d type flip flops every time, wherein being sent to the 1st eight rising edge D for the first time Trigger U₁₀₄8 data input pins data be high byte address, the address date is from the 9th of 16 bit the Position play sixteen bit until, successively, the 9th correspond to the 1st eight rising edge d type flip flop U₁₀₄8 data input pins 1D, the tenth correspond to 2D ... sixteen bit correspond to 8D；It is sent to the 3rd eight rising edge d type flip flop U for the second time₁₀₃8 The data of a data input pin are the addresses of low byte, which plays the 8th from first of 16 bit Until, successively, first correspond to the 3rd eight rising edge d type flip flop U₁₀₃The 1D of 8 data input pins, second corresponds to In 2D ... the 8th correspond to 8D；The two byte address data sent out in two times are in the 3rd, the 2nd eight rising edge d type flip flops U₁₀₃、U₁₀₅Data-out port form the 13 binary storage device address codes arranged in order from low to high and U₁₀₃ Data-out port 1Q~8Q and U₁₀₅Data-out port 1Q~5Q and two address wire parallel connections first memory U₄₀, second memory U₄₁Address end feet A0~A12 have one-to-one connection relation；The module further includes others Peripheral component and circuit, these peripheral components and circuit include the 8D latch 74LS373 with ternary output extension The piece circuit that program storage is connected with microcontroller 8031 outside, the clock crystal oscillator that frequency is 12MHZ are connected with microcontroller Circuit, for BCD- seven-segment decoders/driver, current-limiting resistance and the LED seven needed for instant playback power factor data The circuit of the connections such as segment numeral display, these belong to well known technological know-how, are no longer discussed in detail and are drawn in figure.

In conjunction with error correction method discussed above and the work(using metering type time data application module connected into Rate factor measuring device, and with reference to shown in figure 2,4,5,6, one of 7, it is possible to it is clearly understood from, by first and second circuit list First waveform changing circuit is handled, again by the 4th circuit unit U₁₀Output terminal 1_OUTAnd U₁₁Output terminal 2_OUTIt is respectively outputted to different Or door U₁₀₁Two input terminals 1, after 2 feet through U₁₀₁The sample time signal t of 3 foot of output terminal output_cyAccess microcontroller End feet, signal width are exactly the time counting value that timer/counter T0 is read, while U₈Output terminal output voltage Rectangular wave and U₉Output terminal output electric current rectangle wave respectively by or door U₁₁4 feet and 2_INThrough its output terminal 2 after foot input_OUT It is both the voltage of output, electric current or gate signal access microcontrollerEnd feet, signal width are exactly timer/counter The time counting value that T1 is read；Therefore, formula (6) becomes：

In formula, t_cyWhen being the offset of power grid rated frequency to the sine wave-shaped signal zero passage of the voltage of same phase, electric current The time value that time difference is counted, is exactly the count value of T0, T_cyThe time value in period when being the offset of power grid rated frequency, It is exactly the count difference value of (T1-T0)；The sinusoidal waveform of the voltage of same phase, electric current is believed when t is power grid rated frequency 50HZ The time counting value that the time difference of number zero passage is counted；T_rPeriod time value when being power grid rated frequency 50HZ is one Known value；

Formula (7) simplification is obtained again：

It further, can be by using the function of door control bit GATE and application method and two of microcontroller timer A timer/counter T0, T1 are quick, simple to realize to read the calculation procedure of required time data and application microcontroller Just power-factor measurement and display, " program circuit schematic diagram " as shown in Figure 7, step is：

The value of T0 and T1 is substituted into formulaIt is calculated, it is later to the decimal point in acquired results Value obtains 16 bits of two bytes after being rounded up；

The high byte of 16 bits is sent to the 1st eight rising edge d type flip flop U₁₀₄Data output end；

The low byte of 16 bits is sent to the 3rd eight rising edge d type flip flop U₁₀₃Data output end and simultaneously The 1st eight rising edge d type flip flop U₁₀₄Value on data output end is sent to the 2nd eight rising edge d type flip flop U₁₀₅Data it is defeated In outlet, using 16 bits of two byte as first memory U of two address wire parallel connections₄₀And second deposited Reservoir U₄₁Address directly read out the power factor numerical value in its corresponding storage unit and give instant playback；

T0 and T1 is reset；

It is returned after putting 1 to T0 and T1, waits for next test loop.

Interlock circuit in metering type time data application module in above-mentioned measuring device is made one, and simply modification will Metering type time data application module is made to become another form of measurement type time data application module：That is, disconnect U₁₁It is defeated Outlet 2_OUTWith microcontroller U₁₀₂The 13rd foot, i.e.Between connecting line, while need not according still further to above-mentioned stepsIn public affairs Formula is calculated, as long as according to above-mentioned steps after directly reading the count value of T0It carries out, it is last only T0 to be reset and again It is returned after putting 1 to T0, waits for next test loop；This change makes measurement type power-factor measurement device compared with aforementioned survey Amount type power-factor measurement device is simpler compact, and is further added by a kind of application mode.

The power-factor measurement device installed by method of the present invention and requirement should be placed in the metallic shield of ground connection Ground wire in babinet and on the electronic circuit board of device should be properly grounded to prevent external interference by regulation.Two of measuring device Input signal be respectively it is that the secondary current of measurement voltage transformer and Verification of Measuring Current Transformer is converted by resistance and The sine wave-shaped signal that harmonic wave interference is handled, its waveforms amplitude is proportional to primary current is filtered out by electronic circuit, this two The quadratic sine waveform signal of a input signal, i.e. voltage transformer and the quadratic sine waveform signal of current transformer should use The signal shielding cable and aviation connection-peg of shielding layer grounding are respectively connected to the first circuit unit forward voltage of measuring device Follower U₁In-phase input end 1_INWith second circuit unit forward voltage follower U₃In-phase input end 1_IN.It is input to the work( The signal of second circuit unit forward voltage follower in rate factor measuring device recommends Authorization Notice No. and is The electronic circuit that passes through of the cable punching full-shield electronic current transducer secondary side of CN204558230U filters out harmonic wave and does Disturb the quadratic sine waveform signal exported after processing；The preposition electricity of the first circuit unit being input in the power-factor measurement device The signal of pressure follower recommends the signal of ceramic electronic voltage transformer secondary side, the secondary side signal be equally need through It crosses electronic circuit and filters out the quadratic sine waveform signal exported after harmonic wave and interference processing, should be used for ceramic electronic mutual induction of voltage Device secondary side signal filter out the electronic circuit of harmonic wave and interference processing with cable punching full-shield electronic current transducer The electronic circuit used in secondary side is the same.

In the circuit of apparatus of the present invention, amplifier U₁、U₂、U₃、U₄、U₅Positive and negative power end all meet ± 15V working powers, R₃ The other end, R₉The other end, R₁₁The other end be all connected with simulation ground；In addition to this, other integrated circuits positive supply termination+ 5V working powers, negative power end or ground connection termination are digitally；In the circuit of apparatus of the present invention, R₄=R₅=R₆=R₇, R₈= R₁₀, R₉=R₁₁, R₁₈=R₁₉, C₁=C₂。

Here is the simple signal table of time t value and power factor value conversion table.It, can during if you need to a complete conversion table Formula (4) is calculated using the power factor in text of the invention voluntarily to calculate.

Claims

1. a kind of measuring method of power factor is applied to power-factor measurement device, and the voltage of measuring device input And two signals of electric current be respectively the measurement voltage of same phase, current transformer secondary current by resistance be converted into, And by the sinusoidal voltage waveform signal for filtering out harmonic wave interference processing of electronic circuit, referred to as voltage transformer, Current Mutual Inductance The quadratic sine waveform signal of device, it is characterised in that：The measuring method includes a power factor and calculates formula, passes through the public affairs Data and storage to these data, application process is calculated in formula, includes the following steps：

(1) power factor calculates formula：

In formula, f_rIt is the rated frequency of electric system, to the sine wave-shaped signal of the voltage of same phase, electric current when t is rated frequency The time value that time difference during zero passage is counted to get, unit are microsecond (us)；

(2) single-phase power factor of power frequencyIn0~90 ° is taken, is corresponded toRadian is rated frequency f_r When a cycle T_rA quarter, i.e.,In formula, T_rPeriod time value when being rated frequency；Set electric power System nominal frequency is f_rWhenInIt is changed to by 0The Hus times are needed, thenWherein H takes just whole Number, unit us；Time t value by 1us, by be incremented by 1us every time, until until Hus, respectively one by one substitution power because T in number calculation formula is calculated HValue, the HValue include the number of four after decimal point Value；Obtained HValue Data according to time t value ascending sequential organization into time t value and power factor value Conversion table, referred to as " conversion table "；

(3) it is represented respectively with 16 bits until time t value being played Hus from 1us, successively as the address of memory simultaneously Correspondingly H in conversion table4 bit digitals are deposited using four binary-decimal binary-coded decimals after the decimal point of value In the storage unit for entering memory, memory uses electrically erasable programmable ROM EEPROM, and storage address capacity is big In 5K, each storage unit of a memory is a byte, stores 2 four binary coded decimal binary-coded decimals namely 2 Decimal number, the storage unit of two bytes store 4 decimal numbers, i.e., with the memory of two 8K × 8, in order, first Memory stores oneFront two after the decimal point of value in 4 ten's digits, second memory store oneLatter two after the decimal point of value in 4 ten's digits；Wherein, the t values in conversion table are 0th~31 correspondingIt is 1.0000 to be worth, and is all changed to after 0.9999 in the storage unit of 4-digit number deposit appropriate address after decimal point；

(4) using two signal zero passages of the voltage and current of acquisition time difference or perhaps time counting value when are as memory Location directly reads the power factor value in memory respective memory unit and output.

2. a kind of measuring device of power factor applies a kind of measuring method of power factor, the measurement described in claim 1 Two signals of voltage and current of device input are respectively the secondary current process of the measurement voltage of same phase, current transformer The sinusoidal voltage waveform signal that resistance is converted into and by electronic circuit for filtering out harmonic wave interference processing, referred to as voltage are mutual The quadratic sine waveform signal of sensor, current transformer, it is characterised in that：It includes first, second, third and fourth circuit unit, and the tenth Two circuit units and a time data application module store H in conversion table in the form of binary-coded decimalTwo ground of value The electrically erasable programmable ROM of location line parallel connection is connected in time data application module；

Wherein, the circuit structure of first and second circuit unit, component and its parameter are identical, are voltage, electric current input Mutual inductor quadratic sine waveform signal is converted into the circuit of the square-wave signal output of Transistor-Transistor Logic level respectively,

First circuit unit is included by the use of amplifier OP-07 as forward voltage follower U₁, by the use of OP-37 as with open-loop gain Voltage comparator U₄, resistance R₄、R₅、R₈、R₉, capacitance C₁, diode D₁, diode D₂, further included U₆And U₈, U₆And U₈It is respectively Have a gate circuit in 42 input nand gate 74LS132 of Schmidt trigger, connection is, voltage transformer it is secondary Sine wave-shaped signal accesses U₁In-phase input end i.e. 1_IN, U₁Inverting input and U₁Output terminal be connected, U₁Output terminal With resistance R₄One end be connected, resistance R₄The other end and U₄In-phase input end be connected, resistance R₅The other end and U₄'s Inverting input i.e. 2_INIt is connected, U₄Output terminal and resistance R₈One end be connected, R₈The other end and R₉One end be connected It connects, R₉The other end connection simulation ground, capacitance C₁And R₉Parallel connection, R₈The other end and U₆Two input terminals be connected, diode D₁Input terminal and U₆Two input terminals be connected, D₁Output terminal connection+5V, diode D₂Output terminal connection D₁Input End, D₂Input terminal connection digitally, U₆Output terminal and U₈Two input terminals be connected, U₈Output terminal be the first circuit The output terminal of unit exports the rectangular wave pulse signal of high level；

Second circuit unit is included by the use of amplifier OP-07 as forward voltage follower U₃, by the use of OP-37 as with open-loop gain Voltage comparator U₅, resistance R₆、R₇、R₁₀、R₁₁, capacitance C₂, diode D₃, diode D₄, further included U₇And U₉, U₇And U₉Respectively It is a gate circuit having in 42 input nand gate 74LS132 of Schmidt trigger, connection is the two of current transformer Secondary sine wave-shaped signal accesses U₃In-phase input end i.e. 1_IN, U₃Inverting input and U₃Output terminal be connected, U₃Output End and resistance R₆One end be connected, resistance R₆The other end and U₅In-phase input end be connected, resistance R₇The other end and U₅ Inverting input i.e. 2_INIt is connected, U₅Output terminal and resistance R₁₀One end be connected, R₁₀The other end and R₁₁One end phase Connection, R₁₁The other end connection simulation ground, capacitance C₂And R₁₁Parallel connection, R₁₀The other end and U₇Two input terminals be connected, two Pole pipe D₃Input terminal and U₇Two input terminals be connected, D₃Output terminal connection+5V, diode D₄Output terminal connection D₃'s Input terminal, D₄Input terminal connection digitally, U₇Output terminal and U₉Two input terminals be connected, U₉Output terminal be second The output terminal of circuit unit exports the rectangular wave pulse signal of high level；

Third circuit unit is a zero-point voltage adjustment circuit unit, including by the use of amplifier OP-07 as voltage follower U₂、 Adjustable resistance R₁, resistance R₂、R₃, connection is adjustable resistance R₁One end connection+15V, other end connection -15V, adjustable resistance R₁Adjustable end connection resistance R₂One end, R₂Other end connection resistance R₃One end, R₃The other end connection simulation ground, R₂ The other end and U₂In-phase input end be connected, U₂Inverting input and U₂Output terminal be connected, U₂Output terminal it is defeated Go out and be divided into two-way, all the way with the resistance R of the first circuit unit₅One end be connected, R₅The other end and U₄Inverting input be 2_INIt is connected, the resistance R of another way and second circuit unit₇One end be connected, R₇The other end and U₅Inverting input be 2_INIt is connected；

4th circuit unit is by 42 inputs and an AND gate circuit U in door integrated circuit 74LS08₁₀With 42 inputs or door collection Into an OR circuit U in circuit 74LS32₁₁It forms, connection is U₈Output terminal connection U₁₀Input terminal 1_INAnd U₁₁'s 4 end feet of input terminal；U₉Output terminal connection U₁₁Input terminal 2_INAnd U₁₀3 end feet of input terminal；

12nd circuit unit be one with LED light come indicated horsepower factor is advanced, circuit of lag, including a U₁₆, i.e. 4 Two gate circuit U in bidirectional shift register 74LS194, the 74LS04 phase inverter of position₁₃、U₁₄, current-limiting resistance R₁₂、R₁₃, a finger Show the advanced green LED LED light D of voltage₅, the advanced red light emitting diodes LED light D of an indicator current₆And electricity Hinder R₁₄, capacitance C₃An and pulse-delay unit；U₁₁Output terminal 2_OUTThe signal of output is through the pulse-delay unit slightly microsecond U is input to after delay₁₆11 feet, i.e. CP ends, can determine whether and make to intercept the precedence in both voltage, electric currents signal Advanced or lag red, green lamplight pointing, the component of pulse-delay unit are included in 42 inputs or door integrated circuit 74LS32 One gate circuit U₂₁, 74L,S02 42 input nor gate integrated circuit in two gate circuit U₂₃、U₂₄, 74LS04 hex inverter collection Into a gate circuit U in circuit₂₂With resistance R₁₆, capacitance C₅；The connection of pulse-delay unit is U₁₁Output terminal 2_OUTConnect respectively Meet U₂₁Two input terminals 1,2 feet, U₂₁3 foot of output terminal and resistance R₁₆One end be connected, R₁₆The other end respectively with U₂₃ 1 foot of input terminal and capacitance C₅One end be connected, C₅The other end connection digitally, U₂₃Another 2 foot of input terminal And U₂₄3 foot of output terminal be connected, U₂₃3 foot of output terminal and U₂₄1 foot of input terminal be connected, phase inverter U₂₂Input End and U₂₁3 foot of output terminal be connected, U₂₂Output terminal and U₂₄Another 2 foot of input terminal be connected, U₂₄Output terminal be arteries and veins Rush the output terminal of delayer, U₂₄3 foot of output terminal be connected to U₁₆11 feet, i.e. CP ends；

U in 12nd circuit unit₁₆3 feet and U₈Output terminal be connected, U₁₆5 feet and U₉Output terminal be connected, U₁₆ 1,9,10 feet and resistance R₁₄One end be connected, R₁₄The other end be connected with+5V, R₁₄One end also with capacitance C₃One End is connected, C₃The other end connection digitally, U₁₆15 feet and U₁₃Input terminal be connected, U₁₃Output terminal and instruction electricity Press advanced green LED LED light D₅Cathode be connected, D₅Anode pass through resistance R₁₂It is connected with+5V, U₁₆'s 13 feet and U₁₄Input terminal be connected, U₁₄Output terminal and the advanced red light emitting diodes LED light D of indicator current₆Cathode It is connected, D₆Anode pass through resistance R₁₃It is connected with+5V；

One time data application module, there are two types of application forms for time data application module tool：When power-factor measurement fills It puts when being applied to require relatively low common survey occasion to accuracy of measurement, the time data application module in measuring device is adopted With measurement type time data application module, device is known as measurement type power-factor measurement device；When using power-factor measurement side When the power-factor measurement device of method is applied to the AC energy metering occasion more demanding to accuracy of measurement, measuring device In time data application module using metering type time data application module, device is known as metering type power-factor measurement dress It puts；

When power-factor measurement device is measurement type power-factor measurement device, the time data application module in device is adopted With measurement type time data application module, including the five, the six, seven, eight, nine, ten, 11 circuit units；

5th circuit unit is 10MHZ pulses generations and ten frequency dividing circuits, the 1MHZ pulse inputs of output to the 6th circuit list Member, the 5th circuit unit include 10MHZ crystal oscillators, 74LS04 hex inverters U₃₀, 74LS160 decimal system synchronous countings Device U₂₉, resistance R₁₇、R₁₈、R₁₉, capacitance C₆, connection is 74LS04 hex inverters U₃₀The 1st, connection resistance R between 2 feet₁₈, U₃₀The 3rd, connect R between 4 feet₁₉, U₃₀The 2nd, connect C between 3 feet₆, U₃₀The 1st, 10MHZ crystal oscillations are connected between 4 feet Device, U₃₀The 2nd foot and the 13rd foot be connected, U₃₀The 12nd foot and 74LS160 decimal system coincidence counters U₂₉The 2nd foot CP ends It is connected, U₂₉The foot of the 1st, 7,9 and 10 pass through resistance R₁₇It is connect with+5V power supplys, U₂₉The 15th foot output 10MHZ through ten frequency dividing 1MHZ pulses afterwards are 1 pulse per microsecond；

6th circuit unit is by four 74LS161 tetrad coincidence counters U₂₅、U₂₆、U₂₇、U₂₈It is connected in sequence One 16 binary time pulse counting circuit, output be one by zero ing, every time incrementally 16 two of 1us into Number processed, first, i.e. U, left side in four counters₂₅The 14th foot be output 16 bits in lowest order, should First, i.e. U, right side in four counters₂₈The 11st foot be highest order in 16 bits of output, connection is, U₂₅The 15th foot connection U₂₆The 10th foot, U₂₆The 15th foot connection U₂₇The 10th foot, U₂₇The 15th foot connection U₂₈The 10th foot, 2nd foot CP ends of four counters and U₂₉The 15th foot be connected, four counters the 7th, 9 feet and U₂₅The 10th foot pass through Resistance R₁₇It is connected with+5V power supplys, the 1st foot of four countersEnd and the U of the 4th circuit unit₁₁Output terminal 2_OUTPhase Connection；

7th circuit unit is a holding impulse circuit, by the inputs of 74L,S08 42 and door integrated circuit U₃₅In one and door Circuit is formed, and connection is U₃₅1 foot and the 6th circuit unit output 16 bits in the 11st, i.e. U₂₇12 Foot is connected, U₃₅2 feet and 16 bits in the 13rd, i.e. U₂₈14 feet be connected, U₃₅3 feet as the 7th electricity The output terminal of road unit generates in 5120us after time counting circuit starts and counts and exports holding pulse, pulse input To the CP ends of four bidirectional shift registers of the 9th circuit unit；

8th circuit unit is four to be incorporated to-and 74LS194 i.e. 4 bidirectional shift register the U that works in a manner of going out₃₁、U₃₂、 U₃₃、U₃₄The time data buffering circuit being in turn connected into, connection be, four counters of the 6th circuit unit totally 16 numbers It connects one to one according to output terminal to 16 data input pins of the 8th circuit unit, i.e., U₂₅、U₂₆、U₂₇、U₂₈Each counter The 14th, 13,12,11 feet correspond successively access U₃₁、U₃₂、U₃₃、U₃₄Each register the 3rd, 4,5,6 feet；Four deposits 16 data input pins of totally 16 data output ends and the 9th circuit unit one-to-one correspondence of device is connected, i.e., U₃₁、U₃₂、 U₃₃、U₃₄Each register the 15th, 14,13,12 feet correspond access U successively₃₆、U₃₇、U₃₈、U₃₉Each register the 3rd, 4th, 5,6 foot；Four register U₃₁、U₃₂、U₃₃、U₃₄The 9th, 10 feet connection resistance R₂₀One end, resistance R₂₀The other end and+5V Power supply connects, R₂₀One end pass through capacitance C₇Connection is digitally；Four register U₃₁、U₃₂、U₃₃、U₃₄The 1st footEnd and the The U of four circuit units₁₁Output terminal 2_OUTIt is connected；Four register U₃₁、U₃₂、U₃₃、U₃₄The 11st foot CP ends and the 4th circuit The U of unit₁₀Output terminal 1_OUTIt is connected；

9th circuit unit is four to be incorporated to-and 74LS194 i.e. 4 bidirectional shift register the U that works in a manner of going out₃₆、U₃₇、 U₃₈、U₃₉The time data holding circuit being in turn connected into, connection are four register U₃₆、U₃₇、U₃₈、U₃₉The 1st foot End, 9,10 feet and resistance R₂₀One end be connected, R₂₀The other end connected with+5V power supplys, R₂₀One end pass through capacitance C₇Connection Digitally；11st foot CP ends of four registers and output terminal, the i.e. U of the 7th circuit unit₃₅3 feet be connected；Four deposits Preceding 13 output terminals in 16 data output ends of device, i.e. from U₃₆The 15th foot rise, according to priority, the 14th, 13,12 feet, It is U to connect down₃₇The 15th, 14,13,12 feet, then it is U to connect down₃₈The 15th, 14,13,12 feet, be finally U₃₉The 15th foot, respectively Successively with the tenth circuit unit, i.e. first memory U₄₀, second memory U₄₁13 address wire A in parallel₀~A₁₂One by one Correspondence is connected；

Tenth circuit unit is arranged to the electro erasible programmable of 8K × 8 of two address wire parallel connections of read-only working method only Read memory EEPROM2864, first memory U₄₀With second memory U₄₁13 articles of address wires it is in parallel and with the 9th electricity Preceding 13 data output ends of road unit, which sequentially correspond, to be connected, and four have been used in two Memory Storage Units H in the form deposit conversion table of binary-decimal binary-coded decimalValue；Its connection is first memory U₄₀With Two memory U₄₁The 20th, 22 feet pass through resistance R₂₁It connects digitally, first memory U₄₀With second memory U₄₁'s 27th foot passes through resistance R₂₂Connection+5V power supplys, first memory U₄₀With second memory U₄₁13 address wire A in parallel₀ ~A₁₂Successively in 16 data output ends of the 9th circuit unit before 13 output terminals, i.e. U₃₆、U₃₇、U₃₈15,14, 13rd, 12 feet and U₃₉15 feet one-to-one correspondence be connected, first memory U₄₀With second memory U₄₁The number of two memories According to output terminal mouth line I/O₀~I/O₇It is connected with the 11st circuit unit for totally 16 articles；

11st circuit unit is the power factor being tested for instant playbackValue, including BCD- seven-segment decoders/drive Dynamic device U₄₂、U₄₃、U₄₄、U₄₅；Current-limiting resistance R₂₃×7、R₂₄×7、R₂₅×7、R₂₆×7；Seven sections of common-anode LED digital displays U₄₆、 U₄₇、U₄₈、U₄₉；The data of the input terminal of the 11st circuit unit memory in parallel with two address wires of the tenth circuit unit The I/O connections of output terminal mouth line；Its connection method is U₄₀Data output end mouth line the 11st, 12,13,15 feet, i.e. I/O₀、I/O₁、 I/O₂、I/O₃Successively and U₄₂7,1,2,6 feet be connected, export and in U₄₆It is upper that address wire two storages in parallel are shown First ten's digit stored in totally two storage bytes of device, U₄₀Data output end mouth line the 16th, 17,18,19 feet, That is I/O₄、I/O₅、I/O₆、I/O₇Successively and U₄₃7,1,2,6 feet be connected, export and in U₄₇It is upper that address wire is shown simultaneously Second ten's digit stored in totally two storage bytes of two memories of connection, U₄₁Data output end mouth line 11st, 12,13,15 feet, i.e. I/O₀、I/O₁、I/O₂、I/O₃Successively and U₄₄7,1,2,6 feet be connected, export and in U₄₈It is upper aobvious What is shown be two memories of address wire parallel connection totally two storage bytes in the third ten's digit that stores, U₄₁Data Output terminal mouth line the 16th, 17,18,19 feet, i.e. I/O₄、I/O₅、I/O₆、I/O₇Successively and U₄₅7,1,2,6 feet be connected, it is defeated Go out and in U₄₉The 4th decimal number stored in two storage bytes of upper two memories that address wire parallel connection is shown Word；U₄₂、U₄₃、U₄₄、U₄₅9~15 feet and current-limiting resistance R₂₃×7、R₂₄×7、R₂₅×7、R₂₆× 7 and seven-segment numeric indicator U₄₆、U₄₇、U₄₈、U₄₉It is corresponding to connect to realize digital-scroll technique；

When power-factor measurement device is metering type power-factor measurement device, the time data application module in device is adopted With metering type time data application module, which includes a gate circuit in 42 input XOR gate integrated circuit 74LS86 U₁₀₁, the microcontroller 8031 that its a piece of clock crystal oscillator frequency is 12MHZ is U₁₀₂, three eight rising edge d type flip flops 74LS377, that is, U₁₀₃、U₁₀₄、U₁₀₅With H in conversion table are stored in the form of binary-coded decimalTwo address wires parallel connection of value Electrically erasable programmable ROM EEPROM2864, that is, U₄₀、U₄₁, microcontroller 8031 passes through P₀Mouth extension delivery outlet, utilizes three Eight rising edge d type flip flop 74LS377 and the read-only memory of two address wire parallel connections are attached, the specific connection of circuit It is：The U of 4th circuit unit₁₀Output terminal 1_OUTWith XOR gate U₁₀₁The 1st foot be connected, the U of the 4th circuit unit₁₁It is defeated Outlet 2_OUTWith XOR gate U₁₀₁The 2nd foot and microcontroller 8031That is U₁₀₂The 13rd foot and the 12nd circuit unit In pulse-delay unit U₂₁Two input terminals 1,2 feet be connected, XOR gate U₁₀₁The 3rd foot and microcontroller 8031That is U₁₀₂The 12nd foot be connected；8 end feets of microcontroller P0 mouth lines are ascending by number, press P0.0 to P0.7 Sequence sequentially correspondingly with the 1st eight rising edge d type flip flop U₁₀₄8 data input pin 1D~8D be connected, the 1st A eight rising edges d type flip flop U₁₀₄8 data output end 1Q~8Q correspondingly with the 2nd eight rising edge d type flip flop U₁₀₅ 8 data input pin 1D~8D be connected, the 3rd eight rising edge d type flip flop U₁₀₃8 data input pin 1D~8D sequentially Correspondingly with the 1st eight rising edge d type flip flop U₁₀₄8 data input pin 1D~8D parallel connections be connected, on the 3rd eight It rises along d type flip flop U₁₀₃8 data output end 1Q~8Q and first memory U₄₀The address wire end feet of low eight by number It is ascending, be sequentially attached correspondingly by the sequence of A0 to A7, the 2nd eight rising edge d type flip flop U₁₀₅8 1Q~5Q and first memory U in data output end₄₀The address wire end feet of high five it is ascending by number, i.e. press A8 Sequence to A12 is sequentially attached correspondingly, microcontroller U₁₀₂The 16th foot, i.e.End feet and three eight rising edge D Trigger U₁₀₃、U₁₀₄、U₁₀₅The 11st foot, i.e. CP end feets be connected, microcontroller U₁₀₂The 27th foot, i.e. P2.6 feet and the 1st eight Rising edge d type flip flop U₁₀₄The 1st foot, i.e.End feet is connected, microcontroller U₁₀₂The 28th foot, i.e. P2.7 feet simultaneously and the 2nd, 3 A eight rising edges d type flip flop U₁₀₅、U₁₀₃The 1st foot, i.e.End feet is connected, second memory U₄₁Address wire end feet A0~ A12 and first memory U₄₀Address wire end feet A0~A12 carry out connection in parallel correspondingly；Set microcontroller U₁₀₂ The address date of 16 bits of two bytes of its P0 mouthfuls of output is to be arranged in order from lowest order to highest order, divide two It is secondary, a byte is sent to 8 data input pins of eight rising edge d type flip flops every time, wherein being sent to the 1st eight rising edge D for the first time Trigger U₁₀₄8 data input pins data be high byte address, the address date is from the 9th of 16 bit the Position play sixteen bit until, successively, the 9th correspond to eight 8 data input pins of rising edge d type flip flop 1D, the tenth Corresponding to 2D ... sixteen bit correspond to 8D；It is sent to the 3rd eight rising edge d type flip flop U for the second time₁₀₃8 data input The data at end are the addresses of low byte, and the address date is from until first of 16 bit is played the 8th, successively First correspond to the 1D of eight 8 data input pins of rising edge d type flip flop, second corresponds to 2D ... the 8th correspondence In 8D；The two byte address data sent out in two times are in the 3rd, the 2nd eight rising edge d type flip flop U₁₀₃、U₁₀₅Data output end Mouth forms the 13 binary storage device address codes arranged in order from low to high and U₁₀₃Data-out port 1Q~ 8Q and U₁₀₅Data-out port 1Q~5Q and two address wire parallel connections first memory U₄₀, second memory U₄₁ Address end feet A0~A12 have one-to-one connection relation.

3. a kind of measuring device of power factor according to claim 2, it is characterised in that：The metering type time data Application module further includes peripheral component and circuit, and peripheral component and circuit include the 8D latch with ternary output 74LS373 shakes the circuit that program storage is connected with microcontroller 8031 outside the piece of extension, the clock crystal that frequency is 12MHZ Swing circuit that device connect with microcontroller 8031, for it is needed for instant playback power factor data, BCD- seven-segment decoders/drive The display circuit that dynamic device, current-limiting resistance and LED seven-segment numeric indicators are connected.

4. a kind of measuring device of power factor according to claim 2, it is characterised in that：The metering type time data Application module also comprising a simple calculation formula and software program, by the software in program storage to sample when Between data carry out simple computation to obtain more accurate time data as storage address to the power in respective memory unit Factor value is read immediately and display, step are：

Exclusive or gate output terminal i.e. U is measured using the function and application method of the door control bit GATE of microcontroller timer₁₀₁3 Foot is output to microcontroller U₁₀₂12 feet beHigh level, i.e. positive pulse width and measure the 4th circuit unit U₁₁'s Output terminal 2_OUTIt is output to microcontroller U₁₀₂13 feet beHigh level, i.e. positive pulse width, and read T0 and T1 respectively T0 and T1 are closed after count value respectively；

The value of T0 and T1 is substituted into formulaCalculated, the value later to the decimal point in acquired results into Row obtains 16 bits of two bytes after rounding up；

The low byte of 16 bits is sent to the 3rd eight rising edge d type flip flop U₁₀₃Data output end and simultaneously the 1st A eight rising edges d type flip flop U₁₀₄Value on data output end is sent to the 2nd eight rising edge d type flip flop U₁₀₅Data output end On, using 16 bits of two byte as first memory U of two address wire parallel connections₄₀, second memory U₄₁ Address directly read out the power factor numerical value in its corresponding storage unit and give instant playback；

T0 and T1 is reset；

It is returned after putting 1 to T0 and T1, waits for next test loop.

5. a kind of measuring device of power factor according to claim 2, it is characterised in that：Using measurement in described device Type time data application module keeps the temporary sampling time data of impulse circuit at least to keep a 20ms, i.e. cycle Time.

6. a kind of measuring device of power factor according to claim 2, it is characterised in that：Using metering in described device During type time data application module, making a modification to the interlock circuit of the metering type time data application module then becomes it Measurement type time data application module：That is, disconnect U₁₁Output terminal 2_OUTWith microcontroller U₁₀₂13rd foot, i.e.Between connection Line, while need not be according still further to the in claim 4A step is calculated, if after directly reading the count value of T0 according to In claim 4Step carries out, last that only T0 is reset and is returned after putting 1 to T0 again, waits for next test Cycle.