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

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