CN106443175A - Input amplifying unit for single-phase watt-hour meter - Google Patents
Input amplifying unit for single-phase watt-hour meter Download PDFInfo
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- CN106443175A CN106443175A CN201611169631.1A CN201611169631A CN106443175A CN 106443175 A CN106443175 A CN 106443175A CN 201611169631 A CN201611169631 A CN 201611169631A CN 106443175 A CN106443175 A CN 106443175A
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- electric capacity
- operational amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/061—Details of electronic electricity meters
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses an input amplifying unit for a single-phase watt-hour meter. The input amplifying unit is characterized in that an input operational amplifying module, an A/D conversion module, a control module, an electric energy storing module, a key module, an LCD display module and a power module are included; voltage and current signals sequentially pass through the input operational amplifying module and the A/D conversion module and are input into the control module, and the control module is connected with the electric energy storing module, the key module and the LCD display module. Compared with the prior art, the input amplifying unit has the advantages that the power supply cost is low, the circuit is simple, electric energy calculation is easy and convenient, and the speed is high.
Description
Technical field
The present invention relates to electric energy computing technique field, specifically a kind of input for single-phase electric energy meter is amplified single
Unit.
Background technology
Because non-linear electrical equipment puts into operation in electrical network in a large number, cause the proportion that the harmonic component of electrical network accounts for increasingly
Greatly.It not only increases the current supply loss of electrical network, and disturbs the protection device of electrical network and the normal operation of automation equipment, makes
Become malfunction and the tripping of these devices, directly threaten the safe operation of electrical network.Therefore non-linear electrical equipment must be produced
Harmonic wave processed, then first have to complete is exactly the metering of harmonic wave.
At present electric energy meter is all the electric energy that only metering fundamental wave produces, and be all based on electric energy meter computation chip design and
Become, this design to harmonic electric energy meter, the selection of sampling A/D chip is all limited to very much, and cost is very high, be unfavorable for harmonic wave electricity
Can the promoting the use of of table.
Content of the invention
For overcoming the shortcomings of that above-mentioned prior art exists, it is an object of the invention to provide a kind of circuit design is simple, become
This low input amplifying unit for single-phase electric energy meter.
The technical solution adopted for the present invention to solve the technical problems is：A kind of input for single-phase electric energy meter is amplified single
Unit, is characterized in that：Including input operation amplifier module, A/D modular converter, control module, electrical power storage module, key-press module,
LCD display module and power module, voltage, current signal sequentially pass through input operation amplifier module, A/D modular converter is input to
Control module, described control module is also connected with electrical power storage module, key-press module and LCD display module；
Described input operation amplifier module includes DC bias signal and produces circuit, DC pulse moving voltage signal generating circuit
Produce circuit with DC pulse current signal, described DC bias signal produces circuit and produces DC bias signal, described direct current
Pulsating voltage signal produces circuit and includes operational amplifier U10A, and described DC pulse current signal generation circuit includes computing and puts
Big device U10B, the in-phase input end of described DC bias signal difference input operational amplifier U10A and U10B.
Preferably, described DC bias signal produces circuit input end and connects reference voltage, and described reference voltage inputs respectively
Electric capacity C7, C44 and one end of resistance R21, the other end of resistance R21 connects resistance R22, one end of electric capacity C41 and computing respectively
The in-phase input end of amplifier U10C, the inverting input of operational amplifier U10C connect respectively resistance R20, the one of electric capacity C43
End, resistance R20, the outfan of the other end concatenation operation amplifier U10C of electric capacity C43, the outfan of operational amplifier U1C is also
Connect one end of electric capacity C8, C42 respectively, the other end of electric capacity C7, C41, C44, C8, C42 and resistance R22 is all grounded, and computing is put
The outfan output DC bias signal of big device.
Preferably, input termination ac voltage signal AC_L, AC_N of described DC pulse moving voltage signal generating circuit, institute
State one end of ac voltage signal AC_L connecting resistance R30, the other end of resistance R30 connects 1 pin of voltage transformer pt 1, electricity
2 pins of pressure transformer PT1 meet ac voltage signal AC_N, and 4 pins of voltage transformer pt 1 connect resistance R35, R48 respectively
With one end of electric capacity C49, the other end of resistance R48 connects resistance R65, one end of electric capacity C57 and operational amplifier U10A respectively
Inverting input, one end of the in-phase input end connection resistance R49 of operational amplifier U10A, resistance R49, R35 and electric capacity C49's
The other end is all connected with described DC bias signal, the output terminating resistor R65 of described operational amplifier U10A, electric capacity C57 another
One end and one end of resistance R62, electric capacity C55, the described DC bias signal of another termination of electric capacity C55, the other end of resistance R62
Output DC pulse moving voltage signal.
Preferably, described DC pulse current signal produces input termination ac voltage signal CT+, CT- of circuit, described
Ac voltage signal CT+, CT- connect the 1 of Current Transmit 1,2 pins respectively, and 4 pins of Current Transmit 1 connect respectively
Resistance R36, R50 and one end of electric capacity C50, the other end of resistance R50 connects resistance R64, one end of electric capacity C58 and computing respectively
Amplifier U10B inverting input, the in-phase input end of operational amplifier U10B connects one end of resistance R51, resistance R51, R36
It is all connected with described DC bias signal with the other end of electric capacity C102, the output terminating resistor R64 of described operational amplifier U10B,
The other end of electric capacity C58 and one end of resistance R63, electric capacity C56, the described DC bias signal of another termination of electric capacity C56, resistance
The other end output DC pulse current signal of R63.
Preferably, the model of described operational amplifier U10A, U10B and U10C is TLV2374.
Preferably, described control module includes single-chip microcomputer, and model TMS320F28335PGFA of described single-chip microcomputer is described
LCD display module includes segment liquid crystal 4*32 display screen, and the driving chip of described segment liquid crystal 4*32 display screen is HT1621B,
Described memory module includes memorizer, model EFPROM, and described key-press module adopts 6*6 touch key.
The invention has the beneficial effects as follows：The present invention is powered to operational amplifier using single supply, in operational amplifier
In-phase input end be directly added into direct current biasing reference voltage Gadc, low compared to prior art power supply cost, circuit is simple.
Brief description
Fig. 1 is the structure chart of the present invention；
Fig. 2 is the circuit diagram that DC bias signal of the present invention produces circuit；
Fig. 3 is the circuit diagram of DC pulse moving voltage signal generating circuit of the present invention；
Fig. 4 is the circuit diagram that DC pulse current signal of the present invention produces circuit
Specific embodiment
For the technical characterstic of this programme can be clearly described, below by specific embodiment, and combine its accompanying drawing, to this
Bright it is described in detail.
As shown in figure 1, a kind of input amplifying unit for single-phase electric energy meter of the present invention, it includes inputting operation amplifier
Module, A/D modular converter, control module, electrical power storage module, key-press module, LCD display module and power module.Described defeated
Enter operation amplifier module AC signal is converted to and can be known by AD converter by operation amplifier by voltage signal and current signal
The DC pulse signal of other 0-3V, described DC pulse signal is carried out analog digital conversion by A/D modular converter, by transformation result
Digital quantity signal gives described control module, and control module obtains fundamental energy and harmonic electric energy by A/D modular converter；And will
Energy value is delivered to power storage module and is stored, and delivers to LCD display module and shown, in addition key-press module controls LCD
Display module shows corresponding data, and power module gives each module for power supply.
Preferably, described control module includes single-chip microcomputer, and model TMS320F28335PGFA of described single-chip microcomputer is described
LCD display module includes segment liquid crystal 4*32 display screen, and the driving chip of described segment liquid crystal 4*32 display screen is HT1621B,
Described memory module includes memorizer, model EFPROM, and described key-press module adopts 6*6 touch key.
As in Figure 2-4, described input operation amplifier module includes DC bias signal generation circuit, DC pulse moving voltage
Signal generating circuit and DC pulse current signal produce circuit, and described DC bias signal produces circuit and produces direct current biasing letter
Number, described DC pulse moving voltage signal generating circuit includes operational amplifier U10A, and described DC pulse current signal produces electricity
Road includes operational amplifier U10B, the homophase input of described DC bias signal difference input operational amplifier U10A and U10B
End.
As shown in Fig. 2 described DC bias signal produces circuit input end connects reference voltage, described reference voltage is defeated respectively
Enter electric capacity C7, C44 and one end of resistance R21, the other end of resistance R21 connects resistance R22, one end of electric capacity C41 and fortune respectively
Calculate the in-phase input end of amplifier U10C, the inverting input of operational amplifier U10C connects resistance R20, electric capacity C43 respectively
One end, resistance R20, the outfan of the other end concatenation operation amplifier U10C of electric capacity C43, the outfan of operational amplifier U10C
It is also respectively connected with one end of electric capacity C8, C42, the other end of electric capacity C7, C41, C44, C8, C42 and resistance R22 is all grounded, computing
The outfan output DC bias signal Gade of amplifier.
Preferably, the value of resistance R20～R22 is 10K Ω, and the specification of electrochemical capacitor C7, C8 is 4.7 μ F, 10V, electricity
The value holding C41～C44 is 0.1 μ F.
As shown in figure 3, input termination ac voltage signal AC_L, AC_ of described DC pulse moving voltage signal generating circuit
N, one end of described ac voltage signal AC_L connecting resistance R30, the other end of resistance R30 connects 1 pipe of voltage transformer pt 1
Foot, 2 pins of voltage transformer pt 1 meet ac voltage signal AC_N, and 4 pins of voltage transformer pt 1 connect resistance respectively
R35, R48 and one end of electric capacity C49, the other end of resistance R48 connects resistance R65, one end of electric capacity C57 and operation amplifier respectively
Device U10A inverting input, the in-phase input end of operational amplifier U10A connects one end, resistance R49, R35 and the electricity of resistance R49
The other end holding C49 is all connected with described DC bias signal, the output terminating resistor R65 of described operational amplifier U10A, electric capacity
The other end of C57 and one end of resistance R62, electric capacity C55, the described DC bias signal of another termination of electric capacity C55, resistance R62
The other end output DC pulse moving voltage signal.
As shown in figure 4, described DC pulse current signal produces input termination ac voltage signal CT+, CT- of circuit,
Described ac voltage signal CT+, CT- connect the 1 of Current Transmit 1,2 pins respectively, and 4 pins of Current Transmit 1 are respectively
Connect one end of resistance R36, R50 and electric capacity C50, the other end of resistance R50 connect respectively resistance R64, one end of electric capacity C58 and
Operational amplifier U10B inverting input, one end of the in-phase input end connection resistance R51 of operational amplifier U10B, resistance R51,
The other end of R36 and electric capacity C102 is all connected with described DC bias signal, the output terminating resistor of described operational amplifier U10B
One end of R64, the other end of electric capacity C58 and resistance R63, electric capacity C56, the described DC bias signal of another termination of electric capacity C56,
The other end output DC pulse current signal of resistance R63.
Preferably, the model of described operational amplifier U10A, U10B and U10C is TLV2374, the rule of described resistance R30
Lattice are 220K/2W, and the specification of resistance R35, R36 is 22R/0.1%, and the resistance of resistance R48～R51, R64, R65 is 10K Ω,
The resistance value of resistance R62, R63 respectively 10K Ω, 47 Ω, the capacitance respectively 100pF of electric capacity C49, C50, C55～C58,
100pF、0.1μF、0.1μF、0.1μF、0.1μF.
Described input operation amplifier module operation principle be：Reference voltage V ref carries out average through resistance R21, R22
Partial pressure, follows through integrated operational amplifier U10C, the voltage signal of output 0.5*Vref, is alternating voltage and alternating current letter
Number provide DC bias signal.Ac voltage signal AC_L, AC_N through current-limiting resistance R30 and the 1 of voltage transformer pt 1,2 draw
Foot is isolated, and exports to operational amplifier U10A by the 3 of PT1,4 pins and sample resistance R35, and operational amplifier U10A is by electricity
The AC signal of pressure sampling and DC bias signal carry out operation amplifier, the DC pulse that output A/D modular converter can identify
Voltage signal.Ac voltage signal CT+, CT- 1,2 pins through Current Transmit 1 are isolated, by the 3 of CT1,4 pins and
Sample resistance R36 exports to operational amplifier U10B, and operational amplifier U10B is by the AC signal of current sample and direct current biasing
Signal carries out operation amplifier, the DC pulse current signal that output A/D modular converter can identify.
General AC signal operational amplification circuit positive negative signal because AC signal exists, amplifier power supply needs positive and negative
Dual power supply, to ensure that AC signal negative voltage do not lose, using dual power supply high cost, circuit is complicated, and the present invention adopts
Can be powered to operational amplifier with single supply, be directly added into direct current biasing benchmark in the in-phase input end of operational amplifier
Voltage Gadc, carries out additive operation by amplifier, by the negative half period of ac voltage signal and ac current signal be raised to 0V with
On.
The above is the preferred embodiment of the present invention, for those skilled in the art,
Without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications are also regarded as this
Bright protection domain.
Claims (6)
1. a kind of input amplifying unit for single-phase electric energy meter, is characterized in that：Including input operation amplifier module, A/D conversion
Module, control module, electrical power storage module, key-press module, LCD display module and power module, voltage, current signal warp successively
Cross input operation amplifier module, A/D modular converter is input to control module, described control module be also connected with electrical power storage module,
Key-press module and LCD display module；
Described input operation amplifier module includes DC bias signal and produces circuit, DC pulse moving voltage signal generating circuit and straight
Stream pulsating current signal generating circuit, described DC bias signal produces circuit and produces DC bias signal, described DC pulse
Voltage signal generation circuit includes operational amplifier U10A, and described DC pulse current signal produces circuit and includes operational amplifier
U10B, the in-phase input end of described DC bias signal difference input operational amplifier U10A and U10B.
2. a kind of input amplifying unit for single-phase electric energy meter according to claim 1, is characterized in that：Described direct current is inclined
Confidence number produces circuit input end and connects reference voltage, and described reference voltage distinguishes one end of input capacitance C7, C44 and resistance R21,
The other end of resistance R21 connects the in-phase input end of resistance R22, one end of electric capacity C41 and operational amplifier U10C, computing respectively
The inverting input of amplifier U10C connects resistance R20, one end of electric capacity C43 respectively, and resistance R20, the other end of electric capacity C43 connect
Connect the outfan of operational amplifier U10C, the outfan of operational amplifier U10C is also respectively connected with one end of electric capacity C8, C42, electricity
Hold C7, C41, C44, C8, C42 and the other end of resistance R22 is all grounded, the outfan output direct current biasing letter of operational amplifier
Number.
3. a kind of input amplifying unit for single-phase electric energy meter according to claim 2, is characterized in that：Described direct current arteries and veins
Input termination ac voltage signal AC_L, AC_N of dynamic voltage signal generation circuit, described ac voltage signal AC_L connecting resistance
One end of R30, the other end of resistance R30 connects 1 pin of voltage transformer pt 1, and 2 pins of voltage transformer pt 1 connect exchange
Voltage signal AC_N, 4 pins of voltage transformer pt 1 connect resistance R35, R48 and one end of electric capacity C49 respectively, resistance R48's
The other end connects resistance R65, one end of electric capacity C57 and operational amplifier U10A inverting input, operational amplifier U10A respectively
In-phase input end connect one end of resistance R49, the other end of resistance R49, R35 and electric capacity C49 is all connected with described direct current biasing
Signal, the output terminating resistor R65 of described operational amplifier U10A, the other end of electric capacity C57 and resistance R62, the one of electric capacity C55
End, the described DC bias signal of another termination of electric capacity C55, the other end output DC pulse moving voltage signal of resistance R62.
4. a kind of input amplifying unit for single-phase electric energy meter according to claim 3, is characterized in that：Described direct current arteries and veins
Input termination ac voltage signal CT+, CT- of streaming current signal generating circuit, described ac voltage signal CT+, CT- connect respectively
The 1 of Current Transmit 1,2 pins, 4 pins of Current Transmit 1 connect the one of resistance R36, R50 and electric capacity C50 respectively
End, the other end of resistance R50 connects resistance R64, one end of electric capacity C58 and operational amplifier U10B inverting input respectively, fortune
The in-phase input end calculating amplifier U10B connects one end of resistance R51, and the other end of resistance R51, R36 and electric capacity C102 is all connected with
Described DC bias signal, the output terminating resistor R64 of described operational amplifier U10B, the other end of electric capacity C58 and resistance
R63, one end of electric capacity C56, the described DC bias signal of another termination of electric capacity C56, the other end output direct current arteries and veins of resistance R63
Streaming current signal.
5. a kind of input amplifying unit for single-phase electric energy meter according to claim 4, is characterized in that：Described computing is put
The model of big device U10A, U10B and U10C is TLV2374.
6. a kind of input amplifying unit for single-phase electric energy meter according to any one of claim 1-5, is characterized in that：Institute
State control module and include single-chip microcomputer, model TMS320F28335PGFA of described single-chip microcomputer, described LCD display module includes section
Formula liquid crystal 4*32 display screen, the driving chip of described segment liquid crystal 4*32 display screen is HT1621B, and described memory module includes depositing
Reservoir, model EFPROM, described key-press module adopts 6*6 touch key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169631.1A CN106443175A (en) | 2016-12-16 | 2016-12-16 | Input amplifying unit for single-phase watt-hour meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169631.1A CN106443175A (en) | 2016-12-16 | 2016-12-16 | Input amplifying unit for single-phase watt-hour meter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106443175A true CN106443175A (en) | 2017-02-22 |
Family
ID=58216633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611169631.1A Withdrawn CN106443175A (en) | 2016-12-16 | 2016-12-16 | Input amplifying unit for single-phase watt-hour meter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106443175A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471009A (en) * | 2017-09-08 | 2019-03-15 | 科大国盾量子技术股份有限公司 | Bias current value detection circuit and single-photon detector intensity light attack detection circuit, method |
| CN109560781A (en) * | 2018-11-13 | 2019-04-02 | 厦门科华恒盛股份有限公司 | A kind of signal amplification circuit and battery management system |
-
2016
- 2016-12-16 CN CN201611169631.1A patent/CN106443175A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109471009A (en) * | 2017-09-08 | 2019-03-15 | 科大国盾量子技术股份有限公司 | Bias current value detection circuit and single-photon detector intensity light attack detection circuit, method |
| CN109471009B (en) * | 2017-09-08 | 2023-11-03 | 科大国盾量子技术股份有限公司 | Bias value detection circuit and single photon detector strong light attack detection circuit and method |
| CN109560781A (en) * | 2018-11-13 | 2019-04-02 | 厦门科华恒盛股份有限公司 | A kind of signal amplification circuit and battery management system |
| CN109560781B (en) * | 2018-11-13 | 2024-01-02 | 科华数据股份有限公司 | Signal amplifying circuit and battery management system |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20170323 Address after: 250021 Ji'nan, Central District, Shandong City Road, the southern part of the shop No. 18 Applicant after: Shandong Jinzhou Kerui Energy Technology Co. Ltd. Address before: The four Village District in Central District of Ji'nan city of Shandong province 250021 City Building No. 7 Applicant before: Jia Yushu |
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Application publication date: 20170222 |
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