AC VOLTAGE AND DC VOLTAGE MIXING PROTECTION

Original (Chinese)

A protection circuit includes an analog-to-digital converter, a processor, and a control circuit. The analog-to-digital converter generates a sequence of digital values by digitizing a high-voltage signal within a high-voltage area of a vehicle. The control circuit controls multiple contactors coupled to the charging socket in response to a configuration signal. The processor determines if the sequence of digital values represents one of an alternating voltage and a steady-state voltage, asserts the configuration signal to command the control circuit to close a pair of DC contactors in response to the sequence of digital values representing the steady-state voltage, and negates the configuration signal to command the control circuit to open the pair of DC contactors in response to the sequence of digital values representing the alternating voltage to prevent a mixture of the alternating voltage and the steady-state voltage in the high-voltage area.