CN102664621A - Isolation method and circuit for signal acquisition of electronic mutual inductor - Google Patents
Isolation method and circuit for signal acquisition of electronic mutual inductor Download PDFInfo
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- CN102664621A CN102664621A CN2012101650915A CN201210165091A CN102664621A CN 102664621 A CN102664621 A CN 102664621A CN 2012101650915 A CN2012101650915 A CN 2012101650915A CN 201210165091 A CN201210165091 A CN 201210165091A CN 102664621 A CN102664621 A CN 102664621A
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Abstract
The invention discloses an isolation method and circuit for the signal acquisition of an electronic mutual inductor, which aims to solve the technical problems of improving the linearity degree of the isolation circuit and lowering cost. The method comprises the following steps of: outputting direct-current voltage by a reference stabilized voltage power supply; overlapping with an input signal; amplifying or reducing the overlapped input signal; inputting into the second operational amplifier of a servo feedback isolation circuit to the input end of a photoelectric coupler; maintaining the potential of the reverse input end of the second operational amplifier to 0V by the feedback current generated by the photoelectric coupler; and outputting a signal from the output current generated by photocoupling via the reverse input end and the reverse output end of a fourth operational amplifier. The circuit is formed by connecting a reference direct-current power supply circuit and the servo feedback isolation circuit. Compared with the prior art, the isolation method and circuit have the characteristics that linear isolation is realized by the linear photocoupling and operational amplifier, and the isolation circuit has the advantages of simple structure, high precision, good linearity degree, low cost and good safety.
Description
Technical field
The present invention relates to a kind of signal acquisition method and circuit of electronic mutual inductor, partition method and buffer circuit in particularly a kind of electronic mutual inductor signal acquisition process.
Background technology
The analog signal partition method of prior art has many types; Utilize the photoelectricity isolation method having very big advantage aspect cost, volume, antijamming capability and the circuit complexity; Can realize 0.1% high-precision Signal Spacing through the appropriate design circuit; Be a kind of very practical analog signal isolation method, obtained using widely.The purpose one that 0.1% high accuracy is isolated is to bring error because of earth point is different to measurement with output for fear of input (signal end), the 2nd, avoid the influence of inlet circuit fault in order to protect circuit of output terminal, and the 3rd, in order to improve antijamming capability.The isolation of adopting the photoelectricity isolation method to realize is divided into the digital signal isolation and analog signal is isolated; The digital signal buffer circuit is simpler; Analog signal will realize that high accuracy isolates then circuit and want much complicated; Promptly to reach isolation effect, guarantee the high accuracy progress of disease of analog signal again, guarantee the linear transfer of signal.
The greatest problem of using the existence of optocoupler transmission of analogue signal is a nonlinear distortion; Optocoupler realizes that the physical essence of signal transmission is a current delivery; Have a linearity range in the current transmission characteristic of optocoupler, to the optocoupler of different size, the size of its linearity range is different with the linearity.The alleged linear optical coupling of industry is meant in its transfer curve, the shared large percentage of linearity range of the ratio of output current and input current (current transfer ratio), and the linearity is optocoupler preferably.The linearity of optocoupler can obtain through actual measurement easily; Solve the problem that improves the linearity in the prior art and generally can only realize, cause the complicated and high drawback of cost of high accuracy and linear good isolation circuit ubiquity circuit structure through the appropriate design circuit.
Summary of the invention
The partition method and the circuit that the purpose of this invention is to provide a kind of electric mutual inductor signals collecting, the technical problem that solve are the linearities that improves buffer circuit, reduce cost.
The present invention adopts following technical scheme: a kind of partition method of electric mutual inductor signals collecting; May further comprise the steps: it is peaked with reference to the stabilized voltage power supply output dc voltage one, to be higher than the applied signal voltage negative half period with output potential, forms the stack input signal with input signal stack back; Two, the stack input signal is amplified or dwindles, to the working range of optical coupler; Three, amplify or dwindle after input signal be input to the reverse input end of second operational amplifier of servo feedback isolation circuit; The input of electric current to the optical coupler of second operational amplifier output terminal output; The feedback current that photoelectrical coupler produces makes the reverse input end current potential of second operational amplifier maintain 0V, and the output current that the photoelectricity coupling produces is through reverse input end, the output output signal of four-operational amplifier.
Output signal of the present invention converts numerical quantities into through the modulus sampling A, through single-chip microcomputer the numerical quantities that collects is deducted the DC component that fixed value removes stack then.
Direct voltage with reference to stabilized voltage power supply output 2.5V of the present invention.
Amplification of the present invention or dwindle after input signal be input to the reverse input end of second operational amplifier through current-limiting resistance.
Input first light-emitting diode of electric current to the optical coupler of second operational amplifier output terminal output of the present invention; The rayed that first light-emitting diode sends is on second photoelectric diode and the 3rd photoelectric diode of optical coupler; The reverse input end that the feedback current that second photoelectric diode produces flow back into second operational amplifier makes its voltage maintain 0V, and the output current that the 3rd photoelectric diode produces is through reverse input end, the output output signal of four-operational amplifier.
A kind of buffer circuit of electric mutual inductor signals collecting is by connecting and composing with reference to DC power supply circuit and servo feedback isolation circuit; Saidly be provided with power supply chip with reference to DC power supply circuit; The inverting input of power supply chip output termination the 3rd computing discharger; The inverting input of input signal to the three computing dischargers is connected with the resistance that the current signal of input signal is converted into voltage signal between input signal end and the power supply chip output; Said servo feedback isolation circuit is watched and is provided with optical coupler, input termination second operational amplifier of optical coupler, and output termination four-operational amplifier, the feedback signal of optical coupler is imported the input of second operational amplifier.
Be serially connected with first resistance between the inverting input of the 3rd computing discharger of the present invention and the input signal end; Input signal is through the inverting input of first electricity to the three computing dischargers, is connected with the 3rd parallelly connected resistance and the 5th resistance between input signal end and the power supply chip output.
The first light-emitting diode negative terminal of the output termination optical coupler of second operational amplifier of the present invention, the positive termination of first Light-Emitting Diode; The second photodiode negative terminal of said optical coupler connects the input of second operational amplifier, positive ending grounding; The 3rd photodiode negative terminal of said optical coupler connects the inverting input of four-operational amplifier, is just terminating to the normal phase input end of four-operational amplifier.
Optical coupler of the present invention adopts HCNR201 or HCNR200, and second operational amplifier and four-operational amplifier adopt AD8607, and power supply chip adopts ADR441, and the 3rd operational amplifier adopts AD8607.
The reverse input end of second operational amplifier of the present invention and output cross-over connection have second filter capacitor, and the reverse input end of four-operational amplifier and output cross-over connection have the 5th filter capacitor.
The present invention compared with prior art utilizes linear optical coupling and operational amplifier to realize linear the isolation, and it is simple to have a circuit structure, and precision is high, the advantage that the linearity is good, cost is low and safe.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the equivalent circuit theory figure of optical coupler.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained further details.The partition method of electric mutual inductor signals collecting of the present invention may further comprise the steps:
One, at the signal input part of electronic mutual inductor; Be higher than the peaked direct voltage VREF of applied signal voltage negative half period with output potential with reference to stabilized voltage power supply U1 output 2.5V; Form the stack input signal with input signal IN stack back; To raise the input current potential of AC signal, the voltage that makes input signal all be on the occasion of.
Two, through the 3rd operational amplifier U3A the stack input signal after raising is amplified or dwindle, to the working range of optical coupler U5, but make input voltage signal within the scope of linear transform.
Three, amplify or dwindle after input signal be input to the reverse input end of the second operational amplifier U2A through current-limiting resistance R4; The input first light-emitting diode D1 of the U5 of electric current to the optical coupler of U2A output output, the light intensity that D1 sends increases with the increase of the reverse input end input voltage of U2, and the rayed of D1 is on the second photoelectric diode D2 of U5; Make the D2 conducting; The positive ending grounding IGND of D2, the negative terminal of D2 is connected with the reverse input end of U2A, so the reverse input end current potential of U2A maintains 0V; The 3rd photoelectric diode D3 that the light of D1 is radiated at U5 simultaneously goes up, makes the D3 conducting, thereby makes output output signal.
Four, the output signal converts numerical quantities into through modulus AD sampling A, and the single-chip microcomputer through subsequent conditioning circuit deducts the DC component that a fixed value removes stack with the numerical quantities that collects then.
As shown in Figure 1, the buffer circuit of electric mutual inductor signals collecting of the present invention is by connecting and composing with reference to DC power supply circuit and servo feedback isolation circuit.
Servo feedback isolation circuit is provided with an optical coupler U5, the input termination second operational amplifier U2A of optical coupler U5, output termination four-operational amplifier U4A, the input of the feedback signal input U2A of optical coupler U5.U5 adopts HCNR201, and the representative value of its direct current nonlinearity is 0.01%, and maximum is 0.05%, and bandwidth is up to 1MHz, and the gain temperature coefficient is low to moderate-65 * 10-6/ ℃.
Reverse input end at U2A is serially connected with current-limiting resistance R4, and the electric current that guarantees to flow through optical coupler U5 is in the range of linearity of linear optocoupler.Output 1 pin of U2A connects the first light-emitting diode D1 negative terminal, 1 pin of U5, and anode 2 pin of the first Light-Emitting Diode D1 of U5 meet power supply IVCC through the 6th resistance R 6, the light intensity of the output current control D1 of U2A.
The reverse input end of U2A and output cross-over connection have the second filter capacitor C2, and the reverse input end of U4A and output cross-over connection have the 5th filter capacitor C5, improve the antijamming capability of buffer circuit, in order to avoid self-oscillation occurs.
Being provided with a temperature drift with reference to DC power supply circuit is 0.005mV/ ℃ power supply chip U1, U1 output termination the 3rd computing discharger U3A.Be serially connected with first resistance R 1 between the inverting input of U3A and the input signal end, input signal IN is through the inverting input of R1 to U3A.Be connected with the 3rd parallelly connected resistance R 3 and the 5th resistance R 5 between input signal end and the U1 output, be used for the voltage of U1 output is added in input signal, raise the current potential of input signal.Be parallel with second resistance R 2 and the first filter capacitor C1 between the inverting input of U3A and the output, R2 is used to cooperate U3A that input signal is carried out convergent-divergent, input signal is zoomed between the linear zone of U5 in, C1 plays LPF.
R3 and R5 convert the current signal of input signal IN into voltage signal, if IN does not then need R3 and R5 resistance when being input as voltage signal.The reverse amplification circuit that constitutes through U3A then amplifies voltage signal or narrows down in the working range of optical coupler; The output signal that amplifies or dwindle after the processing is input to the second photodiode D2 negative terminal, 3 pin of U5, the anode 4 pin ground connection of D2 through the current-limiting resistance R4 of 100k.
As shown in Figure 2, second photodiode D2 among the U5 and the similar voltage generator of the effect of the 3rd photodiode D3, the electric current that flows through on electric current that flows through on D2 and the D3 and the D1 is linear.Negative terminal 1 pin of D1 is connected to output 1 pin of U2A, and anode 2 pin of D1 meet power supply IVCC through R6.D3 negative terminal 6 pin among the U5 are connected to the inverting input of U4A, and D3 anode 5 pin are connected to the normal phase input end of U4A.The increase of the reverse input end input voltage of U2; The electric current that flows through D1 increases, and luminous quantity also can increase, and the rayed of D1 light source is on D2; Make the D2 conducting; Because anode and the ground connection IGND of D2, the negative terminal of D2 is connected with the reverse input end of U2A, so just can make the current potential of U2A inverting input maintain 0V.
Because the light that D1 produces impinges upon on the D3 of the input that connects U4A simultaneously; The last photoelectric current that also produces of D3; This electric current can be at first flows out from the inverting input of U4A; And then one electric current of output inflow by U4A replaces the electric current that is flowed out by the U4A inverting input gradually, and the voltage of U4A output will raise to produce output voltage gradually simultaneously.The reverse input end of U4A and output cross-over connection have the 7th resistance R 7, are used to limit the electric current that flows through U5, make in U5 is operated between linear zone.
In the present embodiment,, and require low temperature drift if required precision is very high; Optical coupler U5 selects HCNR201; Can select HCNR200 for use generally speaking, the second operational amplifier U2A and four-operational amplifier U4A adopt AD8607, and power supply chip U1 adopts ADR441; The 2.5V voltage of output, the 3rd operational amplifier U3A adopts AD8607.R3 and R5 are 1 Europe, and R1 is 10K, and R2 is 56K, and R4 is 100K, and R6 is 51 Europe, and R7 is 100K, and R1, R2, R3, R4, R5, R6, R7 are that precision is ± 0.10%, and temperature is floated and is ± 5PPM/ ℃ high accuracy low temperature drift resistance, and C1 is 100p, and C2 is 100p, and C5 is 100p.Guaranteed the high accuracy of entire circuit, low temperature drift, the linearity is good.
The buffer circuit operation principle of electric mutual inductor signals collecting of the present invention: U2A, U3A, U4A are by the 5V DC power supply.Stabilized voltage power supply U1 output 2.5V reference voltage, with the alternating voltage stack of input signal, the alternating voltage of input signal after reference voltage is raised between 0 to 5V; Input signal after the stack amplifies through U3A or narrows down in the linear working range of linear optocoupler, and through the output of the reverse input end of R4, U2A, the U2A D1 to U5, the electric current that flows through R4 is linear with the electric current that flows through D1 again; Like this along with increase through R4 input U2A voltage; The electric current of D1 of flowing through increases, and the luminous quantity that is produced also increases, and the rayed of D1 light source is on the D2 of U5; Make the D2 conducting; Because the anode of D2 links to each other with ground IGND, and the negative terminal of D2 is connected with the reverse input end of U2A, so just can make the current potential of the inverting input of U2A maintain 0V.Because the illumination that D1 produces produces photoelectric current on D3; This electric current can be at first flows out from the inverting input of U4A; The electric current of U4A output output replaces the electric current that is flowed out by the U4A inverting input gradually, and the voltage of U4A exit point will raise to produce output voltage gradually simultaneously.The U2A front-end circuit has been raised 2.5V with signal, and the signal processing circuit of buffer circuit back deducts DC component with single-chip microcomputer when exchanging the AD signal sampling, makes the actual value of numerical quantities reaction input signal.It is simple that circuit of the present invention has a circuit structure, and precision is high, and the linearity is good, cost low with advantage such as fail safe height.Experiment shows, arrives in the input range of 5V 0, and output accuracy can reach 0.1%.Reach high accuracy, the low temperature drift progress of disease of analog signal through the servo feedback isolation circuit of U2A, U5 and U4A formation.
Claims (10)
1. the partition method of an electric mutual inductor signals collecting, may further comprise the steps: it is peaked with reference to the stabilized voltage power supply output dc voltage one, to be higher than the applied signal voltage negative half period with output potential, forms the stack input signal with input signal stack back; Two, the stack input signal is amplified or dwindles, to the working range of optical coupler; Three, amplify or dwindle after input signal be input to the reverse input end of second operational amplifier of servo feedback isolation circuit; The input of electric current to the optical coupler of second operational amplifier output terminal output; The feedback current that photoelectrical coupler produces makes the reverse input end current potential of second operational amplifier maintain 0V, and the output current that the photoelectricity coupling produces is through reverse input end, the output output signal of four-operational amplifier.
2. the partition method of electric mutual inductor signals collecting according to claim 1; It is characterized in that: said output signal converts numerical quantities into through the modulus sampling A, through single-chip microcomputer the numerical quantities that collects is deducted the DC component that fixed value removes stack then.
3. the partition method of electric mutual inductor signals collecting according to claim 1 is characterized in that: said direct voltage with reference to stabilized voltage power supply output 2.5V.
4. the partition method of electric mutual inductor signals collecting according to claim 1 is characterized in that: said amplification or dwindle after input signal be input to the reverse input end of second operational amplifier through current-limiting resistance.
5. the partition method of electric mutual inductor signals collecting according to claim 1; It is characterized in that: input first light-emitting diode of electric current to the optical coupler of said second operational amplifier output terminal output; The rayed that first light-emitting diode sends is on second photoelectric diode and the 3rd photoelectric diode of optical coupler; The reverse input end that the feedback current that second photoelectric diode produces flow back into second operational amplifier makes its voltage maintain 0V, and the output current that the 3rd photoelectric diode produces is through reverse input end, the output output signal of four-operational amplifier.
6. the buffer circuit of an electric mutual inductor signals collecting, it is characterized in that: the buffer circuit of said electric mutual inductor signals collecting is by connecting and composing with reference to DC power supply circuit and servo feedback isolation circuit; Saidly be provided with power supply chip (U1) with reference to DC power supply circuit; The inverting input of power supply chip (U1) output termination the 3rd computing discharger (U3A); The inverting input of input signal to the three computing dischargers (U3A) is connected with the resistance that the current signal of input signal is converted into voltage signal between input signal end and power supply chip (U1) output; Said servo feedback isolation circuit is watched and is provided with optical coupler (U5); Input termination second operational amplifier (U2A) of optical coupler (U5); Output termination four-operational amplifier (U4A), the feedback signal of optical coupler (U5) is imported the input of second operational amplifier (U2A).
7. the buffer circuit of electric mutual inductor signals collecting according to claim 6; It is characterized in that: be serially connected with first resistance (R1) between the inverting input of said the 3rd computing discharger (U3A) and the input signal end; Input signal is through first resistance (R1) to the inverting input of the 3rd computing discharger (U3A), is connected with parallelly connected the 3rd resistance (R3) and the 5th resistance (R5) between input signal end and power supply chip (U1) output.
8. the buffer circuit of electric mutual inductor signals collecting according to claim 7; It is characterized in that: first light-emitting diode (D1) negative terminal of the output termination optical coupler (U5) of said second operational amplifier (U2A), the positive termination power (IVCC) of first Light-Emitting Diode (D1); Second photodiode (D2) negative terminal of said optical coupler (U5) connects the input of second operational amplifier (U2A), positive ending grounding; The 3rd photodiode (D3) negative terminal of said optical coupler (U5) connects the inverting input of four-operational amplifier (U4A), is just terminating to the normal phase input end of four-operational amplifier (U4A).
9. the buffer circuit of electric mutual inductor signals collecting according to claim 8; It is characterized in that: said optical coupler (U5) adopts HCNR201 or HCNR200; Second operational amplifier (U2A) and four-operational amplifier (U4A) adopt AD8607; Power supply chip (U1) adopts ADR441, and the 3rd operational amplifier (U3A) adopts AD8607.
10. the buffer circuit of electric mutual inductor signals collecting according to claim 9; It is characterized in that: the reverse input end of said second operational amplifier (U2A) and output cross-over connection have second filter capacitor (C2), and the reverse input end of four-operational amplifier (U4A) and output cross-over connection have the 5th filter capacitor (C5).
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Cited By (10)
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| CN103744321A (en) * | 2013-12-12 | 2014-04-23 | 延锋伟世通电子科技（上海）有限公司 | Optical coupler coding circuit for automobile air-conditioning system |
| CN104135275A (en) * | 2014-07-17 | 2014-11-05 | 沈阳东软医疗系统有限公司 | A signal isolator and a method for debugging the signal isolator |
| CN104660193A (en) * | 2015-01-21 | 2015-05-27 | 上海新研工业设备有限公司 | Linear optocoupler transmitting analog signal circuit |
| CN106059563A (en) * | 2016-07-13 | 2016-10-26 | 上海富电科技有限公司 | Control guide signal collection circuit |
| CN107276545A (en) * | 2016-04-04 | 2017-10-20 | 韦伯斯特生物官能(以色列)有限公司 | The linear isolation amplifier eliminated with output DC voltage |
| CN107656121A (en) * | 2017-11-09 | 2018-02-02 | 珠海泰坦科技股份有限公司 | A kind of low cost DC voltage isolation picking circuit |
| CN109900947A (en) * | 2019-04-11 | 2019-06-18 | 湘潭大学 | A kind of isolation voltage sample circuit for PWM rectifier |
| CN110687336A (en) * | 2019-10-31 | 2020-01-14 | 中电科仪器仪表有限公司 | Broadband analog signal isolation circuit and method based on electric field coupling and oscilloscope |
| CN111250829A (en) * | 2020-03-23 | 2020-06-09 | 广东福维德焊接股份有限公司 | Digital control circuit of underwater constant-power external characteristic welding power supply |
| CN113447704A (en) * | 2021-05-31 | 2021-09-28 | 上海置信智能电气有限公司 | Electronic sensor alternating current signal sampling circuit based on optical coupling isolation |
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| CN103744321A (en) * | 2013-12-12 | 2014-04-23 | 延锋伟世通电子科技（上海）有限公司 | Optical coupler coding circuit for automobile air-conditioning system |
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| CN109900947A (en) * | 2019-04-11 | 2019-06-18 | 湘潭大学 | A kind of isolation voltage sample circuit for PWM rectifier |
| CN110687336A (en) * | 2019-10-31 | 2020-01-14 | 中电科仪器仪表有限公司 | Broadband analog signal isolation circuit and method based on electric field coupling and oscilloscope |
| CN111250829A (en) * | 2020-03-23 | 2020-06-09 | 广东福维德焊接股份有限公司 | Digital control circuit of underwater constant-power external characteristic welding power supply |
| CN113447704A (en) * | 2021-05-31 | 2021-09-28 | 上海置信智能电气有限公司 | Electronic sensor alternating current signal sampling circuit based on optical coupling isolation |
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Effective date of registration: 20170804 Address after: North Road, Gulou District of Nanjing City, Jiangsu province 210000 No. 100 No. 1 Building 8 floor Patentee after: CYG SUNRI MONITORING TECHNOLOGY CO., LTD. Address before: 518057 Nanshan District province high tech Industrial Park, Shenzhen, north of the mountain road, No. 1, No. 3, Patentee before: CYG Sunri Automation Co., Ltd. |