Voltage detection and measurement circuit

摘要

A voltage detection and measurement circuit is provided. The circuit includes a first Zener diode operatively coupled to an AC power input line and a second Zener diode operatively coupled to a reference voltage line. The first and second Zener diodes are configured to pass portions of input AC voltage from the AC power input line to generate output waveforms. The circuit also includes an optocoupler coupled to the first and second Zener diodes to receive the output waveforms from the first and second Zener diodes to detect the input AC voltage and a processing circuit configured to receive the output waveforms from the optocoupler and to determine a magnitude of the input AC voltage based upon the output waveforms