CN216449651U - Multichannel high accuracy high pressure detection circuitry - Google Patents
Multichannel high accuracy high pressure detection circuitry Download PDFInfo
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- CN216449651U CN216449651U CN202122797919.6U CN202122797919U CN216449651U CN 216449651 U CN216449651 U CN 216449651U CN 202122797919 U CN202122797919 U CN 202122797919U CN 216449651 U CN216449651 U CN 216449651U
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Abstract
The utility model discloses a multi-channel high-precision high-voltage detection circuit, and relates to the technical field of signal detection. 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 utility model relates to the technical field of signal detection, in particular to a multi-channel high-precision high-voltage detection circuit.
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.
SUMMERY OF THE UTILITY MODEL
The utility model 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 utility model 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 optical coupling relay, the precision resistor adopts a resistor with 0.1% precision, the optical coupling relay adopts a common anode for 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 utility model 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 measuring channels can use different voltage dividing resistors R1, and if one resistor is inconvenient to form an ideal voltage dividing value, 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 (8)
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.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2020229773121 | 2020-12-10 | ||
| CN202022977312 | 2020-12-10 |
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| CN216449651U true CN216449651U (en) | 2022-05-06 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557743A (en) * | 2020-12-10 | 2021-03-26 | 国网辽宁省电力有限公司丹东供电公司 | Multi-channel high-precision high-voltage detection circuit and detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112557743A (en) * | 2020-12-10 | 2021-03-26 | 国网辽宁省电力有限公司丹东供电公司 | Multi-channel high-precision high-voltage detection circuit and detection method |
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