CN203519695U - Isolated direct current voltage acquisition circuit - Google Patents
Isolated direct current voltage acquisition circuit Download PDFInfo
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- CN203519695U CN203519695U CN201320592354.0U CN201320592354U CN203519695U CN 203519695 U CN203519695 U CN 203519695U CN 201320592354 U CN201320592354 U CN 201320592354U CN 203519695 U CN203519695 U CN 203519695U
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- 238000005070 sampling Methods 0.000 claims abstract description 16
- 238000002955 isolation Methods 0.000 claims description 26
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000007796 conventional method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 4
- 230000003412 degenerative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 230000008859 change Effects 0.000 description 2
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- 230000033228 biological regulation Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
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Abstract
The utility model discloses an isolated direct current voltage acquisition circuit. The isolated direct current voltage acquisition circuit comprises a sampling circuit, an input-output optical coupler, an operation amplifier and a feedback optical coupler which are connected in sequence. An output resistor is connected between a cathode of a light-emitting device of the feedback optical coupler and power ground. The cathode end of the light-emitting device of the feedback optical coupler is the signal output end of the circuit. A conventional method, in which an operation amplifier and an independent isolated power supply are utilized on the input end, is abandoned; the isolated direct current voltage acquisition circuit is simple in structure, suitable for the high-voltage analog signal acquisition occasion, high in safety and low in cost; the isolated direct current voltage acquisition circuit is wide in linear range, the voltage acquisition range can be changed under different usage conditions by adjusting the resistance value of the sampling circuit, and according to the ratio of the resistor of the sampling circuit to the output resistor, the ratio of the input voltage to the output voltage is constant; and a closed loop control system is adopted, output signals serve as feedback signals, the influence of the fluctuation of input signals on the feedback loop is reduced, the feedback quality is improved, and the accuracy of the detection result is improved.
Description
Technical field
The utility model belongs to voltage isolation detection field, is specifically related to a kind of DC voltage Acquisition Circuit with isolation.
Background technology
Traditional approach generally adopts the measures such as electric resistance partial pressure, capacitance partial pressure or voltage hall sensor collection to carry out voltage acquisition, adopts voltage hall sensor to gather existing collection advantage fast and accurately, and shortcoming is that cost is high, and also needs additionally to provide dual power supply; And the feature of electric resistance partial pressure and capacitance partial pressure mode is simple in structure, cheap, shortcoming is to gather between side and outgoing side there is no electrical isolation, be illustrated in figure 1 the circuit diagram that adopts electric resistance partial pressure type DC voltage to gather, between the collection side of sort circuit and outgoing side, there is no electrical isolation, voltage acquisition circuit has potential safety hazard.
The method of simulating signal isolation has a variety of; the isolation that wherein utilizes optocoupler to realize electric signal has that circuit structure is simple, antijamming capability is strong, volume is little; the advantages such as cost is low, both can protect circuit of output terminal to avoid the impact of input end fault, and strong anti-interference ability can also be provided.
Be illustrated in figure 2 and adopt light-coupled isolation to carry out DC voltage Acquisition Circuit figure, as shown in the figure, this circuit is comprised of sample circuit and buffer circuit, and sample circuit adopts in-phase proportion computing, amplifier Q1, resistance R 1, R2, R3, consist of, the output of amplifier Q1 is as output terminal; Buffer circuit is comprised of optocoupler OP1, resistance R 4, R5 and capacitor C 2, and signal send optocoupler OP1 isolation after amplifier Q1 in-phase proportion calculation process, and the signal after light-coupled isolation exports microprocessor metering circuit to.Because this circuit is directly sent into microprocessor metering circuit after over-sampling, isolation, therefore testing result error is larger, can not be widely used.
Utility model content
The purpose of this utility model is to provide a kind of DC voltage Acquisition Circuit with isolation, to solve the large problem of available circuit testing result error.
In order to realize above object, the technical scheme that the utility model adopts is: a kind of DC voltage Acquisition Circuit with isolation, comprise the sample circuit, input and output optocoupler, amplifier and the feedback optocoupler that connect in turn, the output terminal of input and output optocoupler is connected to the in-phase input end of amplifier, and the output terminal of feedback optocoupler is connected to the inverting input of described amplifier by a feedback resistance; Between the output terminal of the light-receiving device of described input and output optocoupler and feedback optocoupler and power supply ground, be all connected with a sampling resistor; Between the negative electrode of the illuminator of feedback optocoupler and power supply ground, be connected with output resistance, the cathode terminal of the illuminator of this feedback optocoupler is the signal output part of this circuit.
The inverting input of described amplifier and output terminal are connected with a building-out capacitor.
This circuit also comprises a power supply that is used to input and output optocoupler, feedback optocoupler and amplifier power supply.
The resistance of the sampling resistor being connected between output terminal and the power supply ground of the light-receiving device of described input and output optocoupler and feedback optocoupler is equal.
The illuminator of described input and output optocoupler and feedback optocoupler is light emitting diode, and light-receiving device is phototriode.
Described input and output optocoupler and feedback optocoupler are PC817; Described amplifier is single amplifier or double operational chip LM358.
The way at input end use amplifier and independent isolating power supply that the DC voltage Acquisition Circuit of the utility model band isolation discards tradition, sample circuit, input and output optocoupler, amplifier and feedback optocoupler are connected in turn, simple in structure, without using insulating power supply and amplifier at input end, be applicable to high pressure simulation signals collecting occasion, improve security, reduce costs; The range of linearity is wide, in different service conditions, regulate the resistance of sample circuit can change voltage acquisition scope, and according to the resistance of sample circuit, the ratio of output resistance, input voltage and output voltage is fixing proportionate relationship; Adopt closed-loop control system, utilize output signal as feedback signal, reduced the impact of the fluctuation of input signal on backfeed loop, improve and fed back quality, and then improved the accuracy of testing result.
Accompanying drawing explanation
Fig. 1 is existing electric resistance partial pressure type DC voltage Acquisition Circuit figure;
Fig. 2 is existing light-coupled isolation DC voltage Acquisition Circuit figure;
Fig. 3 is the circuit diagram of the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, the utility model is described further.
Be illustrated in figure 3 the circuit diagram of the DC voltage Acquisition Circuit embodiment of the utility model band isolation, as seen from the figure, it comprises the upper sample circuit connecting of circuit input end Uin, sample circuit is connected with feedback optocoupler OP2 in turn with input and output optocoupler OP1, amplifier Q1, the two ends of the illuminator of input and output optocoupler OP1 are connected with sample circuit, be connected between both positive and negative polarity DC+, the DC-of tested high pressure, for tested high pressure converted being become low current signal send into input and output optocoupler OP1 input end simultaneously; The emitter output terminal of input and output optocoupler OP1 light-receiving device is connected the input as negative feedback reference voltage signal with the in-phase input end of amplifier Q1, the output terminal of amplifier Q1 is connected with feedback optocoupler OP2, and the output terminal of feedback optocoupler OP2 is connected to amplifier Q1 inverting input by a feedback resistance R3 forms the accurate of negative feedback loop assurance output voltage as feedback signal; Between the output terminal of the light-receiving device of input and output optocoupler and feedback optocoupler and power supply ground, be all connected with a sampling resistor (being R1 and R2); The anode of the illuminator of feedback optocoupler connects the output of amplifier Q1, between its negative electrode and power supply ground, be connected output resistance Rout, the voltage at Rout two ends is the output voltage of the light-coupled isolation reduction voltage circuit of DC voltage collection, and the cathode terminal of the illuminator of this feedback optocoupler OP2 is the signal output part Uout of this circuit.
The inverting input of the present embodiment amplifier and output terminal are connected with a building-out capacitor C1 as integrating circuit, for improvement of circuit stability, reduce the bandwidth of operation of circuit output noise and limiting circuit.
This circuit also comprise one be used to input and output optocoupler, the power supply of feedback optocoupler and amplifier+15V power supply.
The sample circuit of the present embodiment is by a plurality of resistance (R4 and R5) current-limiting circuit in series; Input and output optocoupler OP1 and feedback optocoupler OP2 select the common optical coupler PC817 of same batch of single encapsulation, and its illuminator is light emitting diode, and light-receiving device is phototriode; Amplifier Q1 is integrated transporting discharging, can adopt chip LM358 of single amplifier or integrated double operational etc.
The output end voltage signal of input and output optocoupler OP1 is to be connected in series a resistance R 1 as sampling resistor between the light-receiving device emitter of OP1 and 15V power supply ground, and the voltage at R1 two ends is as the output end voltage signal of OP1; The output end voltage signal of feedback optocoupler OP2 is to be connected in series a resistance R 2 as sampling resistor between the light-receiving device emitter of feedback optocoupler OP2 and 15V power supply ground, and the voltage at R2 two ends is as the output end voltage signal of OP2.Sampling resistor R1, R2 are as OP1 and the output load of OP2 light-receiving device emitter, and the two resistance size should equate.
Principle of work of the present utility model and process are as follows: access DC voltage positive and negative terminal after the illuminator of OP1 is connected in sample circuit, the input current of OP1 is i1, output current is i2, by regulating input voltage that the actual input voltage of OP1 is changed, to meet output current i2 and input current i1, be the requirement that proportional linearity changes; OP1 light-receiving device emitter sampling resistor R1 both end voltage is degenerative reference voltage U1, with the variation of OP1 output current, changes; The output terminal of amplifier Q1 (feeding back optocoupler OP2 illuminator anode) voltage is U2; OP2 light-receiving device emitter sampling resistor R2 both end voltage is degenerative feedback voltage U3; The output voltage of this circuit (feeding back optocoupler OP2 illuminator cathode voltage) is Uout.Negative feedback is actually has used difference compensation, the variation of OP1 output current i2 directly causes the variation of the negative feedback reference voltage U1 at sampling resistor R1 two ends, the result of the feedback regulation effect of amplifier Q1 is that Q1 output end voltage U2 changes, thereby making to feed back optocoupler OP2 input end current i 11 changes, linear regulation effect due to feedback optocoupler OP2, feedback optocoupler OP2 output current i22 changes, and then the degenerative feedback voltage at sampling resistor R2 two ends is changed; By such negative feedback, finally make U2 voltage stabilization.
After powering on, i1 reaches certain value, and i2 reaches certain value thereupon, and U1 also reaches certain value, now reference voltage and feedback voltage difference are very large, and by the integral action of amplifier, U2 increases, cause i11 to increase, the transmitting effect i22 increase due to feedback optocoupler OP2, causes U3 to increase; Due to the short resolution of void of amplifier, feedback voltage U3 equals reference voltage U1, and when U3=U1, integral action stops, and U2 magnitude of voltage is constant, and i2=i22 in the time of now can proper R1=R2 can obtain i1=i11 by the linear transfer effect of optocoupler,
Have following equation to set up:
Uout=i11·Rout.................................（1）
Uin=i1·（R4+R5）.................................（2）
By i1=i11 and formula (1), (2), Uout/Uin=Rout/(R4+R5).The light-coupled isolation reduction voltage circuit that this DC voltage that hence one can see that gathers is before isolation optocoupler input end is saturated, and input and output are proportionate relationship, and irrelevant with the transfer ratio of optocoupler; So both accurately high voltage had been converted to low-voltage and gathered for signals collecting loop, effectively realized again electrical isolation, protected the security of Acquisition Circuit; By changing the resistance of input resistance (R4+R5), can in the situation that the one-piece construction of device is not made to any change, make it be applicable to different electric pressures.
Claims (6)
1. the DC voltage Acquisition Circuit with isolation, it is characterized in that: comprise the sample circuit, input and output optocoupler, amplifier and the feedback optocoupler that connect in turn, the output terminal of input and output optocoupler is connected to the in-phase input end of amplifier, and the output terminal of feedback optocoupler is connected to the inverting input of described amplifier by a feedback resistance; Between the output terminal of the light-receiving device of described input and output optocoupler and feedback optocoupler and power supply ground, be all connected with a sampling resistor; Between the negative electrode of the illuminator of feedback optocoupler and power supply ground, be connected with output resistance, the cathode terminal of the illuminator of this feedback optocoupler is the signal output part of this circuit.
2. the DC voltage Acquisition Circuit of band isolation according to claim 1, is characterized in that: the inverting input of described amplifier and output terminal are connected with a building-out capacitor.
3. the DC voltage Acquisition Circuit of band isolation according to claim 1 and 2, is characterized in that: this circuit also comprises a power supply that is used to input and output optocoupler, feedback optocoupler and amplifier power supply.
4. the DC voltage Acquisition Circuit of band according to claim 3 isolation, is characterized in that: the resistance of the sampling resistor being connected between the output terminal of the light-receiving device of described input and output optocoupler and feedback optocoupler and power supply ground is equal.
5. the DC voltage Acquisition Circuit of band isolation according to claim 4, is characterized in that: the illuminator of described input and output optocoupler and feedback optocoupler is light emitting diode, and light-receiving device is phototriode.
6. the DC voltage Acquisition Circuit of band isolation according to claim 5, is characterized in that: described input and output optocoupler and feedback optocoupler are PC817; Described amplifier is single amplifier or double operational chip LM358.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320592354.0U CN203519695U (en) | 2013-09-24 | 2013-09-24 | Isolated direct current voltage acquisition circuit |
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| CN201320592354.0U CN203519695U (en) | 2013-09-24 | 2013-09-24 | Isolated direct current voltage acquisition circuit |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106627156A (en) * | 2016-11-06 | 2017-05-10 | 北京理工华创电动车技术有限公司 | High-voltage information acquisition controller |
| CN107228970A (en) * | 2017-08-07 | 2017-10-03 | 河南科技学院 | Double optocoupler mirror image direct current voltage sensors |
| 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 |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
| CN110224611A (en) * | 2019-05-31 | 2019-09-10 | 深圳市奋勇光电有限公司 | A kind of completely isolated circuit |
| CN110824231A (en) * | 2019-11-28 | 2020-02-21 | 南京汇凯顺电子科技有限公司 | Sampling circuit and sampling method for high-voltage direct current voltage and current |
| CN110907348A (en) * | 2019-12-12 | 2020-03-24 | 安徽新力电业科技咨询有限责任公司 | Intelligent full-automatic liquid-phase corrosion tester and control method thereof |
| CN110967540A (en) * | 2019-12-12 | 2020-04-07 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
| CN111404505A (en) * | 2020-04-24 | 2020-07-10 | 北京卫星环境工程研究所 | Voltage amplifier device for space low-energy plasma detector |
| CN112104802A (en) * | 2020-08-21 | 2020-12-18 | 深圳市百川安防科技有限公司 | Camera circuit and camera device |
| CN112711207A (en) * | 2020-12-21 | 2021-04-27 | 国网北京市电力公司 | High-voltage direct current signal acquisition module and electronic device |
| CN113466654A (en) * | 2021-06-01 | 2021-10-01 | 中国电子科技集团公司第四十三研究所 | Method for detecting isolation voltage of linear optical isolation amplifier |
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2013
- 2013-09-24 CN CN201320592354.0U patent/CN203519695U/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106627156A (en) * | 2016-11-06 | 2017-05-10 | 北京理工华创电动车技术有限公司 | High-voltage information acquisition controller |
| CN107228970A (en) * | 2017-08-07 | 2017-10-03 | 河南科技学院 | Double optocoupler mirror image direct current voltage sensors |
| CN107228970B (en) * | 2017-08-07 | 2023-04-25 | 河南科技学院 | Double-optocoupler mirror image direct-current voltage sensor |
| 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 |
| CN109633250A (en) * | 2018-11-09 | 2019-04-16 | 国网浙江省电力有限公司台州供电公司 | One kind prejudging system for protection supervisory equipment terminal block current potential automatic collection in substation |
| CN110224611A (en) * | 2019-05-31 | 2019-09-10 | 深圳市奋勇光电有限公司 | A kind of completely isolated circuit |
| CN110824231A (en) * | 2019-11-28 | 2020-02-21 | 南京汇凯顺电子科技有限公司 | Sampling circuit and sampling method for high-voltage direct current voltage and current |
| CN110967540B (en) * | 2019-12-12 | 2022-03-25 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
| CN110907348A (en) * | 2019-12-12 | 2020-03-24 | 安徽新力电业科技咨询有限责任公司 | Intelligent full-automatic liquid-phase corrosion tester and control method thereof |
| CN110967540A (en) * | 2019-12-12 | 2020-04-07 | 中国电子科技集团公司第四十四研究所 | Isolated linear detection circuit with adjustable transmission coefficient and module comprising same |
| CN111404505A (en) * | 2020-04-24 | 2020-07-10 | 北京卫星环境工程研究所 | Voltage amplifier device for space low-energy plasma detector |
| CN111404505B (en) * | 2020-04-24 | 2023-05-26 | 北京卫星环境工程研究所 | Voltage amplifier device for space low-energy plasma detector |
| CN112104802B (en) * | 2020-08-21 | 2021-07-20 | 深圳市睿联技术股份有限公司 | Camera circuit and camera device |
| CN112104802A (en) * | 2020-08-21 | 2020-12-18 | 深圳市百川安防科技有限公司 | Camera circuit and camera device |
| CN112711207A (en) * | 2020-12-21 | 2021-04-27 | 国网北京市电力公司 | High-voltage direct current signal acquisition module and electronic device |
| CN113466654A (en) * | 2021-06-01 | 2021-10-01 | 中国电子科技集团公司第四十三研究所 | Method for detecting isolation voltage of linear optical isolation amplifier |
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Granted publication date: 20140402 Termination date: 20200924 |