Simple isolation voltage detection circuit

The invention discloses a simple isolation voltage detection circuit, which comprises a magnetic isolation chip with an isolation power supply, an analog-to-digital conversion chip and a sampling resistor network; the magnetic isolation chip with the isolation power supply converts a primary end power supply into an isolation end power supply; the magnetic isolation chip with the isolation power supply isolates a primary end signal and sends the primary end signal to the analog-to-digital conversion chip, receives a feedback signal of the analog-to-digital conversion chip, isolates the feedback signal and sends the isolated feedback signal to a primary end; the analog-to-digital conversion chip uses an isolation end power supply to perform sampling conversion on the voltage at the two endsof a sampling resistor in the resistor network; and the resistance network is connected in parallel to the two ends of the measured voltage. The analog-to-digital conversion chip is arranged at the isolation end, voltage sam