CN112557743A - Multi-channel high-precision high-voltage detection circuit and detection method - Google Patents
Multi-channel high-precision high-voltage detection circuit and detection method Download PDFInfo
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- CN112557743A CN112557743A CN202011455108.1A CN202011455108A CN112557743A CN 112557743 A CN112557743 A CN 112557743A CN 202011455108 A CN202011455108 A CN 202011455108A CN 112557743 A CN112557743 A CN 112557743A
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- 238000005259 measurement Methods 0.000 claims abstract description 41
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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Abstract
The invention discloses a multi-channel high-precision high-voltage detection circuit and a detection method, and the structure is that the multi-channel high-precision high-voltage detection circuit comprises a relay measurement selection circuit, a precision resistance voltage division circuit, a signal conditioning circuit, a high-precision analog-to-digital conversion circuit and a microcontroller which are sequentially connected; the relay measurement selection circuit adopts an optical coupling relay to select a high-voltage measurement channel, the optical coupling relay is controlled through an IO pin of the microcontroller, and an isolation power supply and communication circuit is arranged between the high-precision analog-to-digital conversion circuit and the microcontroller. The precision circuit voltage division circuit comprises a precision resistor and an optocoupler relay, wherein the precision resistor adopts a resistor with the precision of more than 0.1%, the optocoupler relay adopts common anode control, and the precision resistors R1, R2 and R3 form the voltage division circuit. The circuit can realize multi-channel high-precision high-voltage detection with lower cost, the voltage measurement precision can reach within 0.1% after the channel is calibrated, and the measurement path number can be infinitely expanded theoretically.
Description
Technical Field
The invention relates to the technical field of signal detection, in particular to a multi-channel high-precision high-voltage detection circuit and a detection method.
Background
When high-voltage detection is carried out, when an optical coupler is used as an isolation measurement means, an optical coupler signal can be distorted, so that the problem of inaccurate measurement result is caused; if isolation is not performed, there is a risk that high voltage may cross into the system, affecting or even damaging other components of the system. Meanwhile, in order to ensure the measurement precision, an AD chip with high precision of more than 16 bits is used. However, if multiple high voltage values need to be measured, the use of a high-precision multi-channel AD chip would be costly.
Disclosure of Invention
The invention aims to solve the defects, provides a multi-path high-voltage detection circuit for full-isolation measurement by using a single-channel high-precision AD chip, and solves the problem that detection precision and detection cost cannot be simultaneously considered in the prior art.
The invention also aims to provide a detection method of the multi-channel high-precision high-voltage detection circuit.
The invention specifically adopts the following technical scheme:
a multi-channel high-precision high-voltage detection circuit comprises a relay measurement selection circuit, a precision resistance voltage division circuit, a signal conditioning circuit, a high-precision analog-to-digital conversion circuit and a microcontroller which are sequentially connected; the relay measurement selection circuit adopts an optical coupling relay to select a high-voltage measurement channel, the optical coupling relay is controlled through an IO pin of the microcontroller, and an isolation power supply and communication circuit is arranged between the high-precision analog-to-digital conversion circuit and the microcontroller.
Preferably, the precision resistor voltage division circuit comprises a precision resistor and an optocoupler relay, the precision resistor adopts a resistor with 0.1% precision, the optocoupler relay adopts common anode control, and the precision resistors R1, R2 and R3 form the voltage division circuit.
Preferably, the signal conditioning circuit comprises a two-stage operational amplifier.
Preferably, the high-precision analog-to-digital conversion circuit comprises an AD acquisition chip, the output voltage of the signal conditioning circuit is converted by the AD acquisition chip, and the microcontroller reads the conversion result and calculates the final voltage value.
Preferably, the optocoupler relay is AQY216 or AQV258HC8 high-voltage optocoupler relay, the operational amplifier is OPA2277 or OPA2188 dual-channel high-precision operational amplifier, and the AD acquisition chip is ADS1118 or ADS1246 high-precision AD acquisition chip.
The detection method of the multi-channel high-precision high-voltage detection circuit comprises the following steps:
before use, gain calibration of each channel is carried out, and calibration values of each channel are stored in a microcontroller; during measurement, the microcontroller opens the corresponding measurement channel and closes other measurement channels at the same time, the divided voltage enters the high-precision analog-to-digital conversion circuit, the microcontroller reads back the acquired original value through digital isolation communication, and the actual voltage value is calculated according to the calibrated gain; and after the channel measurement is finished, closing the channel, and starting the measurement of the next channel until all the channels are measured.
The invention has the following beneficial effects:
the multichannel high-precision high-voltage detection circuit can realize multichannel high-precision high-voltage detection with lower cost, the voltage measurement precision can reach within 0.1% after the channels are calibrated, and the measurement path number can be infinitely expanded theoretically.
Drawings
FIG. 1 is a block diagram of a multi-channel high-precision high-voltage detection circuit;
FIG. 2 is a circuit diagram of a multi-channel high-precision high-voltage detection circuit;
FIG. 3 shows a relay measurement selection circuit and a precision resistor divider circuit;
FIG. 4 is a signal conditioning circuit;
FIG. 5 is a high precision analog to digital conversion circuit, isolated power and communication circuit, and microcontroller;
fig. 6 is a measurement flow block diagram of the multi-channel high-precision high-voltage detection circuit.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
with reference to fig. 1 and 2, the multi-channel high-precision high-voltage detection circuit comprises a relay measurement selection circuit, a precision resistance voltage division circuit, a signal conditioning circuit, a high-precision analog-to-digital conversion circuit and a microcontroller which are sequentially connected; the relay measurement selection circuit adopts an optical coupling relay to select a high-voltage measurement channel, the optical coupling relay is controlled through an IO pin of the microcontroller, and an isolation power supply and communication circuit is arranged between the high-precision analog-to-digital conversion circuit and the microcontroller.
The precision resistor voltage dividing circuit comprises a precision resistor and an optocoupler relay, the precision resistor adopts a resistor with the precision of 0.1% or more than 0.1%, the optocoupler relay controls the control of a common anode to reduce the complexity of the control circuit, the precision resistors R1, R2 and R3 form the voltage dividing circuit, the precision resistor R1 comprises precision resistors R1.1-R1. N, different voltage dividing resistors R1 can be used for different measurement channels, and if one resistor does not form an ideal voltage dividing value conveniently, a plurality of resistors can be used, such as R1.6-1 and R1.6-2 in figure 3.
The signal conditioning circuit comprises two stages of operational amplifiers, as shown in fig. 4, the dual operational amplifier chips perform 2-stage following on the divided voltage, the interference of the high-voltage part plays a role in buffering and isolating, and the rear-end acquisition and conversion circuit is protected. To ensure accurate measurements at low voltage parts, operational amplifiers powered by positive and negative power supplies can be used to ensure accuracy around a value of 0. If a single power supply is used for power supply, the rail-to-rail operational amplifier can be selected to ensure the accuracy of low-voltage measurement.
The high-precision analog-to-digital conversion circuit comprises an AD acquisition chip, as shown in fig. 5, the output voltage of the signal conditioning circuit is converted by the AD acquisition chip (such as ADS 1118), the MCU reads the conversion result back through specific communication (the ADS1118 uses SPI communication), and the final voltage value is calculated through a series of conversions. The DC of +/-5V can be used for generating +/-5V power supply of a high-voltage part, and isolation communication chips such as ISO7241 or ADUM1411 are used for isolation communication, so that the high-voltage part and the low-voltage part of the system are completely isolated.
The optical coupling relay selects AQY216 and AQV258HC8 high-voltage optical coupling relays, the operational amplifier selects OPA2277 and OPA2188 double-channel high-precision operational amplifier, and the analog-to-digital converter selects ADS1118 and ADS1246 high-precision AD adopted chips.
As shown in fig. 6, before formal use, gain calibration of each channel may be performed, and the calibration value of each channel may be stored in the MCU. During measurement, the MCU opens the corresponding measurement channel and closes other measurement channels at the same time, the divided voltage enters the analog-to-digital converter after passing through the follower, the MCU reads back the acquired original value through digital isolation communication, and the actual voltage value is calculated according to the calibrated gain. And after the channel measurement is finished, closing the channel, and starting the measurement of the next channel until all the channels are measured.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (9)
1. A multi-channel high-precision high-voltage detection circuit is characterized by comprising a relay measurement selection circuit, a precision resistance voltage division circuit, a signal conditioning circuit, a high-precision analog-to-digital conversion circuit and a microcontroller which are sequentially connected; the relay measurement selection circuit adopts an optical coupling relay to select a high-voltage measurement channel, the optical coupling relay is controlled through an IO pin of the microcontroller, and an isolation power supply and communication circuit is arranged between the high-precision analog-to-digital conversion circuit and the microcontroller.
2. The multi-channel high-precision high-voltage detection circuit as claimed in claim 1, wherein the precision resistor voltage division circuit comprises a precision resistor and an optical coupling relay, the precision resistor is a resistor with 0.1% precision, the optical coupling relay is controlled by a common anode, and the precision resistors R1, R2 and R3 form the voltage division circuit.
3. A multi-channel high-precision high-voltage detection circuit as claimed in claim 2, wherein the precision resistor R1 uses resistors with different voltage dividing resistance values for different measurement channels.
4. The multi-channel high-precision high-voltage detection circuit as claimed in claim 2, wherein the optical coupling relay is AQY216, AQV258HC8 high-voltage optical coupling relay.
5. A multi-channel high accuracy high voltage detection circuit as claimed in claim 1 wherein the signal conditioning circuit comprises two stages of operational amplifiers.
6. The multi-channel high-precision high-voltage detection circuit as claimed in claim 5, wherein the operational amplifier is selected from OPA2277 and OPA2188 two-channel high-precision operational amplifiers.
7. The multi-channel high-precision high-voltage detection circuit as claimed in claim 1, wherein the high-precision analog-to-digital conversion circuit comprises an AD acquisition chip, the output voltage of the signal conditioning circuit is converted by the AD acquisition chip, and the microcontroller reads the conversion result and calculates the final voltage value.
8. The multi-channel high-precision high-voltage detection circuit as claimed in claim 7, wherein the AD acquisition chip is ADS1118, ADS1246 high-precision AD acquisition chip.
9. The detection method of the multi-channel high-precision high-voltage detection circuit as claimed in claim 1, characterized by comprising the following steps:
before use, gain calibration of each channel is carried out, and calibration values of each channel are stored in a microcontroller; during measurement, the microcontroller opens the corresponding measurement channel and closes other measurement channels at the same time, the divided voltage enters the high-precision analog-to-digital conversion circuit, the microcontroller reads back the acquired original value through digital isolation communication, and the actual voltage value is calculated according to the calibrated gain; and after the channel measurement is finished, closing the channel, and starting the measurement of the next channel until all the channels are measured.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114185327A (en) * | 2021-12-06 | 2022-03-15 | 广东利扬芯片测试股份有限公司 | High-precision test system for high-speed low-power-consumption microcontroller |
| CN114489208A (en) * | 2021-12-31 | 2022-05-13 | 江苏易美新思新能源科技有限公司 | High-precision low-noise controllable multi-channel power supply and control method thereof |
| CN117420377A (en) * | 2023-12-18 | 2024-01-19 | 西安现代控制技术研究所 | Multichannel relay array monitoring method |
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| CN216449651U (en) * | 2020-12-10 | 2022-05-06 | 国网辽宁省电力有限公司丹东供电公司 | Multichannel high accuracy high pressure detection circuitry |
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- 2020-12-10 CN CN202011455108.1A patent/CN112557743A/en active Pending
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| WO2015165147A1 (en) * | 2014-04-29 | 2015-11-05 | 江苏华东锂电技术研究院有限公司 | Lithium battery pack temperature and voltage monitoring system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114185327A (en) * | 2021-12-06 | 2022-03-15 | 广东利扬芯片测试股份有限公司 | High-precision test system for high-speed low-power-consumption microcontroller |
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| CN117420377B (en) * | 2023-12-18 | 2024-04-26 | 西安现代控制技术研究所 | Multichannel relay array monitoring method |
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Application publication date: 20210326 |