Multi-channel high-precision high-voltage detection circuit and detection method

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 circuitcomprises 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 connected in sequence. The relay measurement selection circuit adopts an optocoupler relay to select a high-voltage measurement channel, the optocoupler relay is controlled through anIO 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, the precision resistor adopts a resistor with the precision of more than 0.1%, the optocoupler relay adoptscommon anode control, and precision resistors R1, R2 and R3 form the voltage division circuit. The circuit can achieve multi-channel high-precision high-voltage detection at a low cost, after the channels are calibrated, the voltage measurement precision can be within 0.1%, and the number of measurement paths can be infinitely expanded theoretically.

Description

technical field [0001] 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 technique [0002] When performing high-voltage detection, when using an optocoupler as an isolation measurement method, the optocoupler signal may be distorted, resulting in inaccurate measurement results; if isolation is not performed, high voltage will be connected to the system, affecting or even damaging other components of the system risk. At the same time, in order to ensure the measurement accuracy, a high-precision 16-bit or more AD chip should be used. However, if multiple high-voltage values ​​need to be measured, the use of high-precision multi-channel AD chips will increase the cost. Contents of the invention [0003] The purpose of the present invention is to address the above-mentioned shortcomings, and proposes a fully isolated measurement, using a multi-c...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above deficiencies, and propose a fully isolated measurement, using a multi-channel high-voltage detection circuit with a single-channel high-precision AD chip, which solves the problem that the detection accuracy and detection cost in the prior art cannot be taken into account at the same time

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