CN202059389U - Voltage sampling circuit - Google Patents
Voltage sampling circuit Download PDFInfo
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- CN202059389U CN202059389U CN2011201383953U CN201120138395U CN202059389U CN 202059389 U CN202059389 U CN 202059389U CN 2011201383953 U CN2011201383953 U CN 2011201383953U CN 201120138395 U CN201120138395 U CN 201120138395U CN 202059389 U CN202059389 U CN 202059389U
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Abstract
The utility model relates to a voltage sampling circuit which comprises a difference filtering circuit and an optocoupler isolation circuit, wherein the difference filtering circuit comprises a signal input end and a differential signal output end; the optocoupler isolation circuit comprises a feedback circuit, an optocoupler element and a voltage follower circuit; the feedback circuit comprises a differential signal input end, a feedback end and a feedback signal output end; the optocoupler element comprises an input end, a first output end and a second output end, wherein the input end is connected with the feedback signal output end; the first output end is connected with an output end of the voltage follower circuit; and the second output end is connected with the feedback end. The voltage sampling circuit has high sampling accuracy and fast sampling speed.
Description
Technical field
The utility model relates to sample circuit, relates in particular to voltage sampling circuit.
Background technology
In numerical control system, usually can't directly carry out the AD sampling to required controlled quentity controlled variable, thereby need reliably nurse one's health these variablees, under the situation that keeps reliable samples precision and sample rate, be converted into the receptible range of variables of digit chip (DSP or MCU) and sample.In the existing numerical control system circuit, employed sample circuit mainly contains two kinds, and promptly directly electric resistance partial pressure sampling type and transducer are isolated sampling type.Because the electric resistance partial pressure sampling type is the mode by electric resistance partial pressure, and the variable of required sampling is directly sampled, and control signal and sampled signal is not effectively isolated, thereby the interference of manipulated signal side is introduced into the control side, influences control precision; And sensor sampling type utilizes the former secondary of transducer that control signal and sampled signal are reliably isolated, but there is the fast inadequately problem of sample rate in sensor type, can influence the reliable samples of signal equally, and the transducer price general charged that sensor sampling type adopted is high, adopt this sample circuit cost performance not high, when sampling quantity during, there is the bigger problem of sampling error much smaller than the range of transducer.
Summary of the invention
The problem that the utility model solves is the existing problem that the voltage sampling circuit control precision is low, speed is slow, price is expensive.
For addressing the above problem, a kind of voltage sampling circuit of the utility model comprises differential filtering circuit and optical coupling isolation circuit, described differential filtering circuit comprises signal input part and differential signal output, this input signal is inputed to the input of differential filtering circuit through resistance by measured signal, optical coupling isolation circuit comprises feedback circuit, optic coupling element and voltage follower circuit, feedback circuit comprises the differential signal input, feedback end and feedback signal output, optic coupling element comprises the input that is connected with the feedback signal output, first output and second output, first output is connected with the output of voltage follower circuit, and second output is connected with feedback end.
Alternatively, described differential filtering circuit comprises first input end, second input, first output, second output, be serially connected in the resistance of the first input end and first output and be serially connected in second input and the resistance of second output, first operational amplifier, first voltage stabilizing didoe, second voltage stabilizing didoe, first resistance, first electric capacity, second resistance and second electric capacity, the in-phase input end of described first operational amplifier is connected with second output, inverting input is connected with first output, the positive pole of described first voltage stabilizing didoe is connected with first output, negative pole is connected with second output, the positive pole of second voltage stabilizing didoe is connected with second output, negative pole is connected with first output, described first resistance and first electric capacity are parallel between the in-phase input end and ground of first operational amplifier, the output of first operational amplifier is as the output of differential filtering circuit, and second resistance and second electric capacity are parallel between the output of the inverting input of first operational amplifier and first operational amplifier.
Alternatively, described feedback circuit comprises second operational amplifier, the 3rd resistance, the 4th resistance and the 3rd electric capacity, the inverting input of described second operational amplifier is connected with the output of differential filtering circuit, the two ends of the one or three resistance are connected with ground respectively at the in-phase input end of second operational amplifier, the two ends of the 3rd electric capacity are connected with output with the in-phase input end of second operational amplifier respectively, the two ends of the 4th resistance are connected with the output of second operational amplifier and the input of optic coupling element respectively, and the end that the 4th resistance is connected with optic coupling element is as the output of feedback circuit.
Alternatively, voltage follower circuit comprises the 3rd operational amplifier and the 5th resistance, and the in-phase input end of the 3rd operational amplifier is connected with the output of optic coupling element and by the 5th grounding through resistance, the inverting input of the 3rd operational amplifier is connected with its output.
Compared with prior art, the utlity model has following advantage:
1, by the differential filtering circuit voltage that is sampled is carried out filtering, and isolate sampled signal and control signal isolation, avoided the interference of control signal and sampled signal, the control precision height through optical coupling isolation circuit.And, need not sensor-typely sample, sample rate is fast, can sample reliably, has reduced error greatly.
2, the utility model comprises amplitude limiter circuit, this amplitude limiter circuit, and the output of restriction entire circuit when output voltage surpasses set limit value, is defined in it in set scope, thereby effectively protects the sampling input port of digit chip (DSP or MCU).
Description of drawings
Fig. 1 is the theory diagram of the utility model voltage sampling circuit;
Fig. 2 is the physical circuit figure of the utility model voltage sampling circuit.
Embodiment
For making the technical solution of the utility model clear and easy to understand, enumerate embodiment below and also illustrated in conjunction with diagram.
As shown in Figure 1, the utility model voltage sampling circuit comprises differential filtering circuit 1 and optical coupling isolation circuit 2.Described differential filtering circuit 1 comprises signal input part and differential signal output, and this voltage division signal is inputed to the input of differential filtering circuit by signal input part.Optical coupling isolation circuit comprises feedback circuit 2, optic coupling element 3 and voltage follower circuit 4.Feedback circuit 2 comprises differential signal input 21, feedback end 22 and feedback signal output 23.Optic coupling element 3 comprises that the input 31, first output 32 and second output, 33, the first outputs 32 that are connected with the feedback signal output are connected with the output of voltage follower circuit 4, and second output 33 is connected with feedback end 22.
As shown in Figure 2, described differential filtering circuit 1 comprises resistance R 11, R12, R1, R2.Comprise first input end, second input, first output, second output, the resistance R 12 that is serially connected in the first input end and first output and R2 and be serially connected in second input and the resistance R 11 and the R1 of second output.
As shown in Figure 2, described differential filtering circuit 1 also comprises the first operational amplifier IC1A, the first voltage stabilizing didoe D1, the second voltage stabilizing didoe D2, first resistance R 3, first capacitor C 1, second resistance R 4 and second capacitor C 2, the in-phase input end of the described first operational amplifier IC1A is connected with second output, inverting input is connected with first output, the positive pole of the described first voltage stabilizing didoe D1 is connected with first output, negative pole is connected with second output, the positive pole of the second voltage stabilizing didoe D2 is connected with second output, negative pole is connected with first output, described first resistance R 3 and first capacitor C 1 are parallel between the in-phase input end and ground of the first operational amplifier IC1A, the output of the first operational amplifier IC1A is as the output of differential filtering circuit 1, and second resistance R 4 and second capacitor C 2 are parallel between the output of the inverting input of the first operational amplifier IC1A and the first operational amplifier IC1A.
As shown in Figure 2, differential filtering circuit 2 also comprises the first Zener diode D3 and the second Zener diode D4, the positive pole of the first Zener diode D3 is connected with the in-phase input end of the first operational amplifier IC1A, the positive pole of the first Zener diode D3 is connected with the positive pole of the second Zener diode D4, the minus earth of the second Zener diode D4.D3 and D4 play the effect of protection amplifier input port, after amplifier input port voltage is greater than two diode voltage values, it are defined in this two diode voltages sum, thus the protection amplifier.
As shown in Figure 2, described feedback circuit 3 comprises the second operational amplifier IC1B, the 3rd resistance R 5, the 4th resistance R 6 and the 3rd capacitor C 3, the inverting input of the described second operational amplifier IC1B is connected with the output of differential filtering circuit 2, the two ends of the 3rd resistance R 5 are connected with ground respectively at the in-phase input end of the second operational amplifier IC1B, the two ends of the 3rd capacitor C 3 are connected with output with the in-phase input end of the second operational amplifier IC1B respectively, and the 3rd capacitor C 3 and the 3rd resistance R 5 are formed integrating circuit.The two ends of the 4th resistance R 6 are connected with the output of the second operational amplifier IC1B and the input of optic coupling element 4 respectively, and the end that the 4th resistance R 6 is connected with optic coupling element 4 is as the output of feedback circuit 3.
As shown in Figure 2, described optic coupling element 4 is chip IC 2, and it is LOC110 that signal chip adopts.Second output 43 of optic coupling element 4 is connected with feedback end 32, and is concrete, is connected with the in-phase input end of the second operational amplifier IC1B.
As shown in Figure 2, voltage follower circuit 5 comprises the 3rd operational amplifier IC3A and the 5th resistance R 8, the in-phase input end of the 3rd operational amplifier IC3A is connected with the output of optic coupling element 4 and by the 5th resistance R 8 ground connection, the inverting input of the 3rd operational amplifier IC3A is connected with its output.
As shown in Figure 2, the utility model voltage sampling circuit also comprises amplitude limiter circuit, described amplitude limiter circuit comprises the 5th voltage stabilizing didoe D5 (comprising two diodes up and down) and the 4th capacitor C 6, the negative pole of the 5th voltage stabilizing didoe D5 connects voltage source, the positive pole of D5 connects ground, interpole is connected with the output of voltage follower circuit 5, and the two ends of the 4th capacitor C 6 are connected with ground with the intergrade of voltage follower circuit 5 respectively.When output voltage surpass+during 5V, the 5th voltage stabilizing didoe D5 goes up the pipe conducting, thereby limit output voltage on be limited to+5V, when output voltage when negative, the following pipe conducting of the 5th voltage stabilizing didoe D5, thus limit the following 0V that is limited to of output voltage
As depicted in figs. 1 and 2, the working method of the utility model sample circuit is as follows:
Be sampled voltage Vin via resistance R 11, resistance R 12, resistance R 1, R2 enters into the input of differential filtering circuit 2, the i.e. input of the first operational amplifier IC1A, process is by behind differential filtering circuit 1 differential filtering, be converted to light light-coupled isolation element 3 acceptable voltage Vinf (wherein the multiple of Vinf and Vin relation is determined by differential filtering circuit 1), optic coupling element 3 is according to run on photoconductive state following time at optocoupler, first output 32 is identical with second output, 33 output currents, wherein second output 33 is as feedback signal, with be sampled the voltage Vinf of voltage Vin behind differential filtering circuit 1 and compare, the integrator rear drive optic coupling element 3 of error through constituting by the 3rd resistance R 5 and the 3rd capacitor C 3, thereby the output that makes first output 32 is followed and is sampled voltage Vin variation, and will be sampled the voltage that voltage Vin is converted to suitable digit chip work.
In sum, the utility model carries out filtering by the differential filtering circuit to the voltage that is sampled, and isolates sampled signal and control signal isolation through optical coupling isolation circuit, has avoided the interference of control signal and sampled signal, the control precision height.And, need not sensor-typely sample, sample rate is fast, can sample reliably, has reduced error greatly.
Claims (4)
1. voltage sampling circuit, it is characterized in that, comprise differential filtering circuit and optical coupling isolation circuit, described differential filtering circuit comprises signal input part and differential signal output, optical coupling isolation circuit comprises feedback circuit, optic coupling element and voltage follower circuit, feedback circuit comprises differential signal input, feedback end and feedback signal output, optic coupling element comprises input, first output and second output that is connected with the feedback signal output, first output is connected with the output of voltage follower circuit, and second output is connected with feedback end.
2. differential filtering circuit as claimed in claim 1, it is characterized in that, described differential filtering circuit comprises first input end, second input, first output, second output, be serially connected in the resistance of the first input end and first output and be serially connected in second input and the resistance of second output, first operational amplifier, first voltage stabilizing didoe, second voltage stabilizing didoe, first resistance, first electric capacity, second resistance and second electric capacity, the in-phase input end of described first operational amplifier is connected with second output, inverting input is connected with first output, the positive pole of described first voltage stabilizing didoe is connected with first output, negative pole is connected with second output, the positive pole of second voltage stabilizing didoe is connected with second output, negative pole is connected with first output, described first resistance and first electric capacity are parallel between the in-phase input end and ground of first operational amplifier, the output of first operational amplifier is as the output of differential filtering circuit, and second resistance and second electric capacity are parallel between the output of the inverting input of first operational amplifier and first operational amplifier.
3. voltage sampling circuit as claimed in claim 1, it is characterized in that, described feedback circuit comprises second operational amplifier, the 3rd resistance, the 4th resistance and the 3rd electric capacity, the inverting input of described second operational amplifier is connected with the output of differential filtering circuit, the two ends of the one or three resistance are connected with ground respectively at the in-phase input end of second operational amplifier, the two ends of the 3rd electric capacity are connected with output with the in-phase input end of second operational amplifier respectively, the two ends of the 4th resistance are connected with the output of second operational amplifier and the input of optic coupling element respectively, and the end that the 4th resistance is connected with optic coupling element is as the output of feedback circuit.
4. voltage sampling circuit as claimed in claim 1, it is characterized in that, voltage follower circuit comprises the 3rd operational amplifier and the 5th resistance, the in-phase input end of the 3rd operational amplifier is connected with the output of optic coupling element and by the 5th grounding through resistance, the inverting input of the 3rd operational amplifier is connected with its output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201383953U CN202059389U (en) | 2011-04-29 | 2011-04-29 | Voltage sampling circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201383953U CN202059389U (en) | 2011-04-29 | 2011-04-29 | Voltage sampling circuit |
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| CN202059389U true CN202059389U (en) | 2011-11-30 |
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| CN2011201383953U Expired - Fee Related CN202059389U (en) | 2011-04-29 | 2011-04-29 | Voltage sampling circuit |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654528A (en) * | 2012-04-13 | 2012-09-05 | 宁波德业变频技术有限公司 | Alternating current voltage sampling device for power factor correction |
| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN102831374A (en) * | 2012-07-30 | 2012-12-19 | 深圳市江波龙电子有限公司 | Bar-code scanner and photoelectric signal processing circuit thereof |
| CN103869144A (en) * | 2014-03-07 | 2014-06-18 | 杭州电子科技大学 | Isolation voltage sampling circuit |
| CN105606871A (en) * | 2015-12-30 | 2016-05-25 | 西安特锐德智能充电科技有限公司 | DC voltage sampling device with prevention of common ground high voltage crosstalk and working method |
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN109884384A (en) * | 2019-04-03 | 2019-06-14 | 深圳市佳运通电子有限公司 | A kind of signal acquisition circuit of compatible electric current and voltage input |
| CN110018340A (en) * | 2019-03-15 | 2019-07-16 | 广州小鹏汽车科技有限公司 | A kind of battery voltage sampling circuit, method and battery management system |
-
2011
- 2011-04-29 CN CN2011201383953U patent/CN202059389U/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102654528A (en) * | 2012-04-13 | 2012-09-05 | 宁波德业变频技术有限公司 | Alternating current voltage sampling device for power factor correction |
| CN102735917A (en) * | 2012-07-10 | 2012-10-17 | 上海市电力公司 | Voltage acquisition circuit for digital signal processor (DSP) |
| CN102831374A (en) * | 2012-07-30 | 2012-12-19 | 深圳市江波龙电子有限公司 | Bar-code scanner and photoelectric signal processing circuit thereof |
| CN102831374B (en) * | 2012-07-30 | 2015-03-25 | 深圳市江波龙电子有限公司 | Bar-code scanner and photoelectric signal processing circuit thereof |
| CN103869144A (en) * | 2014-03-07 | 2014-06-18 | 杭州电子科技大学 | Isolation voltage sampling circuit |
| CN103869144B (en) * | 2014-03-07 | 2017-01-11 | 杭州电子科技大学 | Isolation voltage sampling circuit |
| CN105606871A (en) * | 2015-12-30 | 2016-05-25 | 西安特锐德智能充电科技有限公司 | DC voltage sampling device with prevention of common ground high voltage crosstalk and working method |
| CN105606871B (en) * | 2015-12-30 | 2019-02-05 | 西安特锐德智能充电科技有限公司 | A kind of DC voltage sampling apparatus and working method preventing the high pressure crosstalk of total ground |
| CN106989793A (en) * | 2017-04-28 | 2017-07-28 | 中航工业南航（深圳）测控技术有限公司 | Sample circuit and detection means |
| CN110018340A (en) * | 2019-03-15 | 2019-07-16 | 广州小鹏汽车科技有限公司 | A kind of battery voltage sampling circuit, method and battery management system |
| CN109884384A (en) * | 2019-04-03 | 2019-06-14 | 深圳市佳运通电子有限公司 | A kind of signal acquisition circuit of compatible electric current and voltage input |
| CN109884384B (en) * | 2019-04-03 | 2024-02-06 | 深圳市佳运通电子有限公司 | Signal acquisition circuit compatible with current and voltage input |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: ZHEJIANG JEC NEW ENERGY TECHNOLOGY CO., LTD. Assignor: China Electronic Technology Group Corporation No.36 Research Institute Contract record no.: 2015330000200 Denomination of utility model: Voltage sampling circuit and corresponding charge pump output voltage regulation circuit Granted publication date: 20111130 License type: Exclusive License Record date: 20150715 |
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| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20111130 Termination date: 20170429 |
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| CF01 | Termination of patent right due to non-payment of annual fee |