CN205157646U - Electric energy metering circuit based on voltage controlled oscillator - Google Patents

Abstract

The utility model discloses an electric energy metering circuit based on voltage controlled oscillator for it too much makes the electric energy measure speed problem slow excessively because of the link to have electric energy computing process among the solution prior art. This electric energy metering circuit includes: enlargeing module, bart with the difference, fertile filter module, power synthesis module, accurate rectifier module and voltage controlled oscillator module are connected in proper order now. Adopt the operation and the realization of above -mentioned pure hardware circuit realization electric energy data, system response is real -time quick to voltage -controlled pulse form realization power DC signal quantifys the electric energy data with the electric energy pulse output of different frequency, through the acquisition of the electric energy pulse count to in every unit interval electric energy data, has realized the real -time operation and the output of electric energy data, and the automatic electrical control equipment who has relatively high expectations for the real -time provides a low -cost electric energy data measurement scheme.

Description

A kind of ic for energy metering based on voltage controlled oscillator

Technical field

The utility model relates to Electric Energy Metering Technology field, particularly relates to a kind of ic for energy metering based on voltage controlled oscillator.

Background technology

In the middle of China's all trades and professions robotization industrial control equipment and mine down-hole feed protection opertaing device; electric energy measurement instrument is extremely important; in real time for control center provides the electric energy data of benchmark; when the fault of various complexity appears in scene, control center precisely makes the reaction of disengagement failure fast.

Along with the develop rapidly of China's economy, the demand of all trades and professions to electric energy is increasing, and under this overall situation, electronic electric energy meter technology also achieves huge progress.For alleviating increasingly sharp-pointed imbalance between power supply and demand, electric energy meter also develops into present electronic measurement mode by induction metering method before, the computation chip of specialty is adopted to realize the synthesis of energy data, coordinate the control and scheduling of single-chip microcomputer, improve the unbalanced phenomenon of power consumption, carry out peak, flat, paddy tou power price system, " peak load shifting " comprehensively, improve the power consumption efficiency in the whole nation, Appropriate application electric power resource.But take computation chip as the way of energy measuring of core, employing be discrete digitized compute mode, through over-sampling, A/D conversion, digital multiplication computing, form store, finally by transfer bus arrive single-chip microcomputer.In order to draw metric results, computation chip needs electric current, voltage signal carries out A/D conversion, by drawing Electric energy measurement after digital multiplication computing, this process makes electric energy metrical speed excessively slow because link is too much, as ammeter to the less demanding tariff meter of real-time property in use and be fine, but in the process higher to real-time property requirement of picture Automated condtrol, the data sampling mode being core with special electric energy computation chip is difficult to meet control overflow, and the price of the special metering IC is all higher, be difficult to the energy data sampling application meeting the aspects such as electric feed protection control.

Summary of the invention

The utility model embodiment provides a kind of ic for energy metering based on voltage controlled oscillator, there is energy calculate process because link too much make electric energy metrical speed cross slow problem in order to solve in prior art.

Based on an ic for energy metering for voltage controlled oscillator, this ic for energy metering is: differential amplification module, butterworth filter module, power combing module, precision rectifying module and VCO sequence of modules are connected;

Wherein, differential amplification module, for gathering current signal in consumer networks and voltage signal, and current signal is generated light current current signal by current transformer, and voltage signal is generated light current voltage signal by voltage transformer (VT), again by light current current signal through differential amplification, and by light current voltage signal through differential amplification;

Butterworth filter module, for the light current current signal after differential amplification is carried out low-pass filtering, and carries out low-pass filtering by the light current voltage signal after differential amplification;

Power combing module, for carrying out the light current current signal after low-pass filtering and carry out the input of the light current voltage signal after low-pass filtering analog multiplier synthesis power signal;

Precision rectifying module, for by power signal through precision rectifying process generating power direct current signal;

VCO module, for power DC signal is inputted voltage controlled oscillator, generating electric energy pulse signal, and according to the frequency computation part energy data of electrical energy impulse signals.

The utility model beneficial effect comprises: the computing and the realization that are realized energy data by pure hardware circuit, system is real-time corresponding, there is no A/D transfer process of the prior art, there is not digital multiplication operational software link yet, because digital multiplication operational software link asks energy data, by asking power function integration in time to obtain, therefore whole operation link is complicated, used time is longer, and by the simulating signal of the direct rated output signal of analog multiplier in the utility model embodiment, realize power DC signal with voltage-controlled impulse form to export with the electrical energy pulse of different frequency, energy data is quantized, by obtaining energy data to the electrical energy pulse counting in each unit interval, achieve real-time operation and the output of data, for the robotization electrical control equipment that requirement of real-time is higher provides a kind of low cost electric energy data metering scheme.

Accompanying drawing explanation

Fig. 1 is the process flow diagram of a kind of electric energy gauging method based on voltage controlled oscillator in the utility model embodiment;

Fig. 2 is the structural drawing of a kind of ic for energy metering based on voltage controlled oscillator in the utility model embodiment.

Embodiment

In order to provide the implementation improving energy data counting yield, the utility model embodiment provides a kind of ic for energy metering based on voltage controlled oscillator, is described preferred embodiment of the present utility model below in conjunction with Figure of description.

A kind of electric energy gauging method based on voltage controlled oscillator that the utility model provides and ic for energy metering, the integrated operational amplifier of low cost is utilized to realize the amplification of the analog current signal that gathers from user and analog voltage signal and filtering, power signal is synthesized in real time again by analog multiplier, after precision rectifying process, generating power direct current signal, power DC signal controls voltage controlled oscillator and exports electrical energy pulse, for control system micro-control unit (MicrocontrollerUnit, MCU) provides accurate electric energy data in real time.

Consult shown in Fig. 1, the utility model embodiment is introduced this electric energy gauging method based on voltage controlled oscillator, and the method is:

Step 100: gather the current signal in consumer networks and voltage signal, and current signal is generated light current current signal by current transformer, and voltage signal is generated light current voltage signal by voltage transformer (VT), again by light current current signal through differential amplification, and by light current voltage signal through differential amplification.

Concrete, current signal in consumer networks and voltage signal belong to forceful electric power signal, the ic for energy metering provided in the utility model embodiment can not be provided, therefore, first by mutual inductor, the forceful electric power signal in consumer networks is converted to weak electric signal, by light current current signal and light current voltage signal through differential amplification, effectively can suppress zero point drift, amplify output signal for single-ended signal over the ground.

Step 110: the light current current signal after differential amplification is carried out low-pass filtering, and the light current voltage signal after differential amplification is carried out low-pass filtering.

Concrete, by through the light current current signal of differential amplification and light current voltage signal, input quadravalence Butterworth lowpass wave circuit respectively, the cutoff frequency of quadravalence Butterworth lowpass wave circuit is set to 200 hertz (Hz), the signal exported due to leading portion is analogy of alternating electricity signal, the standard frequency of China's electrical network is 50Hz, therefore original signal can be retained, and the high frequency noise outside filtering cutoff frequency, possesses the requirement of signal operation rank, for follow-up electric energy metrical provides more accurate original signal data.

Step 120: will the light current current signal after low-pass filtering be carried out and carry out the input of the light current voltage signal after low-pass filtering analog multiplier synthesis power signal.

Concrete, to the light current current signal after low-pass filtering be carried out and carry out the input of the light current voltage signal after low-pass filtering analog multiplier, by one-level operational amplifier, multiplying is carried out to the light current current signal after low-pass filtering and the light current voltage signal after low-pass filtering, synthesis power signal, power signal is sine wave signal.

Step 130: by power signal through precision rectifying process generating power direct current signal.

Concrete, by power signal through precision rectifying, obtain effective direct current signal of synthesis power signal, i.e. power DC signal.

Step 140: power DC signal is inputted voltage controlled oscillator, generating electric energy pulse signal, and according to the frequency computation part energy data of electrical energy impulse signals.

Concrete, voltage controlled oscillator refers to that output frequency and input control voltage have the oscillatory circuit (VCO) of corresponding relation, frequency is the oscillation of a function device VCO of applied signal voltage, the duty of oscillator or the component parameters of oscillation circuit, by the control of input control voltage, just can form a voltage controlled oscillator.Through the synthesis power DC signal of precise rectification circuit, access Voltage-Controlled oscillation circuit input end, Voltage-Controlled oscillation circuit output terminal exports electrical energy impulse signals, realizes the metering of energy data according to the frequency exporting electrical energy pulse.

Consult shown in Fig. 2, the utility model embodiment provides a kind of ic for energy metering based on voltage controlled oscillator, and this ic for energy metering comprises: differential amplification module, butterworth filter module, power combing module, precision rectifying module and VCO sequence of modules are connected.Above-mentioned differential amplification module, butterworth filter module, power combing module, precision rectifying module and VCO module are all circuit structure of the prior art, those skilled in the art need the performance according to each integrated circuit, and circuit requirement designs, all depend on the databook that chip supplier provides, according to the technical requirement of functional requirement and Analogical Electronics, be equipped with capacitance resistance ware combination and realize respective concrete function.Each module isolated operation, and can combine and realize electric energy metrical, above-mentioned module all adopts linear power supply to power, and butterworth filter module and the independent external output interface circuit of power combing modular design, externally provide control signal separately; Electrical energy impulse signals provides electrical energy pulse through buffer circuit to control MCU, and wherein, this buffer circuit is for isolating the mutual interference between former and later two modules.

Differential amplification module, for gathering current signal in consumer networks and voltage signal, and current signal is generated light current current signal by current transformer, and voltage signal is generated light current voltage signal by voltage transformer (VT), again by light current current signal through differential amplification, and by light current voltage signal through differential amplification; This differential amplification module is divided into current-differencing amplification module and voltage difference amplification module, its structure is identical, all realize the amplification to signal, one-level integrated operational amplifier LM324 is specifically adopted to realize the differential amplification of one stage signal, the gain of amplifying and mutual inductor cooperatively interact, LM324 series is four road operational amplifiers of low cost, has real Differential Input.

Butterworth filter module, for the light current current signal after differential amplification is carried out low-pass filtering, and carries out low-pass filtering by the light current voltage signal after differential amplification; This butterworth filter module adopts two-way integrated operational amplifier LM324 to realize, and designs, form the low pass butterworth filter of quadravalence according to the parameter of cutoff frequency 200Hz according to the requirement of butterworth filter.

Power combing module, for carrying out the light current current signal after low-pass filtering and carry out the input of the light current voltage signal after low-pass filtering analog multiplier synthesis power signal; This power combing module adopts multifunctional integrated circuit MC1494 design to realize, that there is good rejection capability, the hardware simulation multiplier that bandwidth is good, analog multiplier exports termination one-level operational amplifier LM324 and carries out multiplying to the light current current signal after low-pass filtering and the light current voltage signal after low-pass filtering, generating power signal.

Precision rectifying module, for by power signal through precision rectifying process generating power direct current signal; This precision rectifying module is designed by two-way integrated operational amplifier LM324 and realizes, and can form precise rectification circuit when energy consumption is very little, obtains effective direct current signal of power signal, realizes the extraction of meritorious modulus value.

VCO module, for power DC signal is inputted voltage controlled oscillator, generating electric energy pulse signal, and according to the frequency computation part energy data of electrical energy impulse signals; This VCO module adopts NE555 time base circuit to form V/f voltage controlled oscillator, measures of quantization is realized to the power DC signal through precise rectification circuit rectification, is core with NE555 time base circuit Voltage-Controlled oscillation circuit is the core circuit that electric energy metrical pulse signal is formed wherein for pulse shaping.The electrical energy pulse frequency exported is different, by drawing energy data to electrical energy pulse interior between each unit counting.

In sum, the scheme that the utility model embodiment provides, computing and the realization of energy data is realized by pure hardware circuit, system is real-time corresponding, there is no A/D transfer process of the prior art, there is not digital multiplication operational software link yet, because digital multiplication operational software link asks energy data, by asking power function integration in time to obtain, therefore whole operation link is complicated, used time is longer, and by the simulating signal of the direct rated output signal of analog multiplier in the utility model embodiment, realize power DC signal with voltage-controlled impulse form to export with the electrical energy pulse of different frequency, energy data is quantized, by obtaining energy data to the electrical energy pulse counting in each unit interval, achieve real-time operation and the output of energy data, for the robotization electrical control equipment that requirement of real-time is higher provides a kind of low cost electric energy data metering scheme.

Obviously, those skilled in the art can carry out various change and modification to the utility model and not depart from spirit and scope of the present utility model.Like this, if these amendments of the present utility model and modification belong within the scope of the utility model claim and equivalent technologies thereof, then the utility model is also intended to comprise these change and modification.

Claims (1)

1. based on an ic for energy metering for voltage controlled oscillator, it is characterized in that, described ic for energy metering comprises: differential amplification module, butterworth filter module, power combing module, precision rectifying module and VCO sequence of modules are connected;

Wherein, differential amplification module, for gathering current signal in consumer networks and voltage signal, and current signal is generated light current current signal by current transformer, and voltage signal is generated light current voltage signal by voltage transformer (VT), again by light current current signal through differential amplification, and by light current voltage signal through differential amplification;

Butterworth filter module, for the light current current signal after differential amplification is carried out low-pass filtering, and carries out low-pass filtering by the light current voltage signal after differential amplification;

Power combing module, for carrying out the light current current signal after low-pass filtering and carry out the input of the light current voltage signal after low-pass filtering analog multiplier synthesis power signal;

Precision rectifying module, for by power signal through precision rectifying process generating power direct current signal;

VCO module, for power DC signal is inputted voltage controlled oscillator, generating electric energy pulse signal, and according to the frequency computation part energy data of electrical energy impulse signals.