CN203084068U - Analog voltage acquisition circuit with isolation function - Google Patents
Analog voltage acquisition circuit with isolation function Download PDFInfo
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- CN203084068U CN203084068U CN 201220753473 CN201220753473U CN203084068U CN 203084068 U CN203084068 U CN 203084068U CN 201220753473 CN201220753473 CN 201220753473 CN 201220753473 U CN201220753473 U CN 201220753473U CN 203084068 U CN203084068 U CN 203084068U
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- amplifier
- voltage
- acquisition circuit
- operational amplifier
- output terminal
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Abstract
The utility model relates to an analog voltage acquisition circuit with an isolation function. The analog voltage acquisition circuit includes a voltage dividing circuit which performs voltage division on high voltage signals; the voltage dividing circuit is connected with an operational amplifier U1; an output end of the operational amplifier U1 is connected with an optocoupler isolation chip HCNR201; a feedback output end of the optocoupler isolation chip HCNR201 is connected with a reverse input end of the operational amplifier U1; an output end of the optocoupler isolation chip HCNR201 is connected with an operational amplifier U2; and an output end of the operational amplifier U2 is connected with an A/D detection end of an MCU. According to the analog voltage acquisition circuit of the utility model, after amplified by the operational amplifier U1, voltage analog quantity is directly connected with the optocoupler isolation chip, and thereafter, is further amplified by the operational amplifier U2, and then is transferred to the A/D detection end; and an initial voltage value can be calculated. The analog voltage acquisition circuit of the utility model has the advantages of great measurement linearity, high measurement precision and strong high-voltage resistance.
Description
Technical field
The utility model relates to a kind of signal acquisition circuit with isolation.
Background technology
In power information acquisition terminal function system, often to use analog acquisition to voltage and current, in order to reduce the influence of neighbourhood noise to test circuit, guarantee the accuracy of measurement result, often circuit-under-test and test circuit are isolated on electric.Prior art DC simulation Acquisition Circuit generally is made up of an I/V converter and a slice MCU, though this circuit is simple, with other electric non-isolation, can influence terminal other parts performance when introducing the EMC interference in the external world.Isolate so must adopt, this just needs photoelectrical coupler, and common optoelectronic coupler has the non-linear current transport property, and this transmission for digital quantity and switching value is out of question, but then very poor for the transmission precision of analog quantity.
Summary of the invention
In order to overcome above-mentioned deficiency of the prior art, the aanalogvoltage Acquisition Circuit that the utility model provides a kind of measuring accuracy height, band that the linearity is good to isolate.
The technical scheme in the invention for solving the technical problem is:
A kind of aanalogvoltage Acquisition Circuit with isolation, comprise the bleeder circuit that high-voltage signal is carried out dividing potential drop, described bleeder circuit connects an amplifier U1, the output terminal of described amplifier U1 connects a light-coupled isolation chip HCNR201, the feedback output end of described light-coupled isolation chip HCNR201 connects the reverse input end of described amplifier U1, the output terminal of described light-coupled isolation chip HCNR201 connects an amplifier U2, and the output terminal of described amplifier U2 connects the A/D test side of MCU.
As preferably, amplifier U1 and amplifier U2 all adopt the TLC2272 chip.
As preferably, be connected with building-out capacitor C220 and C221 respectively between the reverse input end of amplifier U1 and amplifier U2 and the output terminal, the output terminal of described amplifier U2 is connected with resistance R 284.
To connect an amplifier U1 through the signal of dividing potential drop, connect a light-coupled isolation chip HCNR201 then, behind amplifier U2, be connected to the A/D test side of MCU again, record analog voltage with this.The feedback end output of amplifier U1 and light-coupled isolation chip HCNR201 forms negative feedback, between the output current of light-coupled isolation chip HCNR201 and the input voltage linear ratio relation's that becomes strict, by amplifier U2 and resistance R 284 output current is converted to voltage, then finally realizes the precision linear relation of output voltage and input voltage.Amplifier U1 and amplifier U2 all adopt the TLC2272 chip, and precision is higher.Be connected with building-out capacitor C220 and C221 between the reverse input end of amplifier U1 and amplifier U2 and the output terminal respectively, be used to the bandwidth of operation that improves circuit stability, reduces circuit output noise and restricting circuits.
The beneficial effects of the utility model are: voltage analog of the present utility model is directly connected to light-coupled isolation after amplifying through amplifier, be sent to the A/D test side after amplifying through amplifier again, then can calculate initial magnitude of voltage, the utility model measure linear degree is good, the measuring accuracy height, and high pressure resistant.
Description of drawings
Fig. 1 is an electrical block diagram of the present utility model.
Fig. 2 is a circuit diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1, 2, a kind of aanalogvoltage Acquisition Circuit with isolation, comprise the bleeder circuit 1 that high-voltage signal is carried out dividing potential drop, bleeder circuit connects an amplifier U1, the output terminal of described amplifier U1 connects a light-coupled isolation chip HCNR201, the feedback output end of described light-coupled isolation chip HCNR201 connects the reverse input end of described amplifier U1, and the output terminal of light-coupled isolation chip HCNR201 connects an amplifier U2, and the output terminal of amplifier U2 connects the A/D test side 2 of MCU.Amplifier U1 and amplifier U2 all adopt the TLC2272 chip.Be connected with building-out capacitor C220 and C221 between the reverse input end of amplifier U1 and amplifier U2 and the output terminal respectively, the output terminal of described amplifier U2 is connected with resistance R 284.
Light-coupled isolation chip HCNR201 is made of high-performance LED and photodiode PD1 and PD2 with strict proportionate relationship, and light-coupled isolation chip HCNR201 schematic diagram as shown in Figure 2.The light that LED sends is received by PD1, PD2, and wherein PD2 is used to produce output current; PD1 is used for servo feedback, and emitting led conducting electric current is compensated, and improves linearity and temperature characterisitic between input and output circuit.This structure has guaranteed the high stability and the high linearity of linear optical coupling.High-voltage signal through after the bleeder circuit dividing potential drop, is connected an amplifier U1 through the signal of dividing potential drop, connect a light-coupled isolation chip HCNR201 then, behind amplifier U2, be connected to the A/D test side of MCU again, record analog voltage with this.When input voltage changes, so the LED electric current is being followed the input voltage variation along with adjusting the electric current I PD1 that flows through PD1, PD2 becomes strict proportionate relationship with PD1 again, same IPD2 follows input voltage and changes, convert IPD2 to output voltage by amplifier U2 and resistance R 284, finally realize the precision linear relation of output voltage and input voltage.Amplifier U1 and amplifier U2 all adopt the TLC2272 chip, and precision is higher.Be connected with building-out capacitor C220 and C221 between the reverse input end of amplifier U1 and amplifier U2 and the output terminal respectively, be used to the bandwidth of operation that improves circuit stability, reduces circuit output noise and restricting circuits.
Voltage analog of the present utility model is directly connected to light-coupled isolation after amplifying through amplifier, is sent to the A/D test side after amplifying through amplifier again, then can calculate initial magnitude of voltage, and the utility model measure linear degree is good, the measuring accuracy height, and also high pressure resistant.
Claims (3)
1. aanalogvoltage Acquisition Circuit with isolation, comprise the bleeder circuit that high-voltage signal is carried out dividing potential drop, it is characterized in that: described bleeder circuit connects an amplifier U1, the output terminal of described amplifier U1 connects a light-coupled isolation chip HCNR201, the feedback output end of described light-coupled isolation chip HCNR201 connects the reverse input end of described amplifier U1, the output terminal of described light-coupled isolation chip HCNR201 connects an amplifier U2, and the output terminal of described amplifier U2 connects the A/D test side of MCU.
2. a kind of aanalogvoltage Acquisition Circuit with isolation according to claim 1, it is characterized in that: described amplifier U1 and amplifier U2 all adopt the TLC2272 chip.
3. a kind of aanalogvoltage Acquisition Circuit according to claim 2 with isolation, it is characterized in that: be connected with building-out capacitor C220 and C221 respectively between the reverse input end of described amplifier U1 and amplifier U2 and the output terminal, the output terminal of described amplifier U2 is connected with resistance R 284.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220753473 CN203084068U (en) | 2012-12-19 | 2012-12-19 | Analog voltage acquisition circuit with isolation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220753473 CN203084068U (en) | 2012-12-19 | 2012-12-19 | Analog voltage acquisition circuit with isolation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203084068U true CN203084068U (en) | 2013-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220753473 Expired - Lifetime CN203084068U (en) | 2012-12-19 | 2012-12-19 | Analog voltage acquisition circuit with isolation function |
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| CN (1) | CN203084068U (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633992A (en) * | 2013-11-20 | 2014-03-12 | 中国船舶重工集团公司第七一六研究所 | Alternating current-direct current analog signal effective value conversion and linear optical wide-temperature conditioning circuit |
| CN103762971A (en) * | 2014-01-25 | 2014-04-30 | 济南诺辉节能技术开发有限公司 | High precision current and voltage isolation conversion module |
| CN106655445A (en) * | 2015-10-29 | 2017-05-10 | 长城汽车股份有限公司 | Photovoltaic charging system of hybrid power vehicle, and control method thereof |
| 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 |
| CN106941354A (en) * | 2017-04-17 | 2017-07-11 | 北京机械设备研究所 | A kind of hardware circuit bearing calibration based on Mathematical Fitting |
| CN107179435A (en) * | 2017-07-24 | 2017-09-19 | 安徽华腾电气有限公司 | AC voltage sampling circuit with isolation |
| CN107238746A (en) * | 2017-06-14 | 2017-10-10 | 国网河南省电力公司电力科学研究院 | A kind of micro current circuit tested for dielectric response |
| PL423693A1 (en) * | 2017-12-04 | 2019-06-17 | Instytut Tele-I Radiotechniczny | System for measuring system with galvanic isolation |
| CN113037276A (en) * | 2021-03-02 | 2021-06-25 | 浙江禾川科技股份有限公司 | Modulation output circuit |
| 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 |
| WO2022127077A1 (en) * | 2020-12-16 | 2022-06-23 | 上海禾赛科技有限公司 | Transmitter circuit for laser radar and method for detecting driving current of transmitter circuit |
-
2012
- 2012-12-19 CN CN 201220753473 patent/CN203084068U/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103633992B (en) * | 2013-11-20 | 2016-03-30 | 中国船舶重工集团公司第七一六研究所 | The RMS-DC converter of alternating current-direct current analog signal and linear optical isolation wide-temperature modulate circuit |
| CN103633992A (en) * | 2013-11-20 | 2014-03-12 | 中国船舶重工集团公司第七一六研究所 | Alternating current-direct current analog signal effective value conversion and linear optical wide-temperature conditioning circuit |
| CN103762971A (en) * | 2014-01-25 | 2014-04-30 | 济南诺辉节能技术开发有限公司 | High precision current and voltage isolation conversion module |
| CN103762971B (en) * | 2014-01-25 | 2017-01-11 | 山东诺辉节能技术开发有限公司 | High precision current and voltage isolation conversion module |
| CN106655445B (en) * | 2015-10-29 | 2020-03-31 | 长城汽车股份有限公司 | Photovoltaic charging system of hybrid electric vehicle and control method thereof |
| CN106655445A (en) * | 2015-10-29 | 2017-05-10 | 长城汽车股份有限公司 | Photovoltaic charging system of hybrid power vehicle, and control method thereof |
| 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 |
| CN106941354A (en) * | 2017-04-17 | 2017-07-11 | 北京机械设备研究所 | A kind of hardware circuit bearing calibration based on Mathematical Fitting |
| CN107238746A (en) * | 2017-06-14 | 2017-10-10 | 国网河南省电力公司电力科学研究院 | A kind of micro current circuit tested for dielectric response |
| CN107238746B (en) * | 2017-06-14 | 2020-06-05 | 国网河南省电力公司电力科学研究院 | Micro-current measuring circuit for dielectric response test |
| CN107179435A (en) * | 2017-07-24 | 2017-09-19 | 安徽华腾电气有限公司 | AC voltage sampling circuit with isolation |
| PL423693A1 (en) * | 2017-12-04 | 2019-06-17 | Instytut Tele-I Radiotechniczny | System for measuring system with galvanic isolation |
| WO2022127077A1 (en) * | 2020-12-16 | 2022-06-23 | 上海禾赛科技有限公司 | Transmitter circuit for laser radar and method for detecting driving current of transmitter circuit |
| CN113037276A (en) * | 2021-03-02 | 2021-06-25 | 浙江禾川科技股份有限公司 | Modulation output circuit |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130724 |