NON-ISOLATED POWER SUPPLY OUTPUT CHASSIS GROUND FAULT DETECTION AND PROTECTION SYSTEM

摘要

A non-isolated power supply is configured to receive an input voltage and supply an output voltage, and includes a supply line, a return line, a first semiconductor switch coupled in series in the supply line, and a second semiconductor switch coupled in series in the return line. The first and second semiconductor switches are each configured to operate in an ON state and an OFF state. The differential current sensor is configured to sense differential current between the supply line and the return line. The fault detection logic is coupled to the differential current sensor, the first semiconductor switch, and the second semiconductor switch, and is configured to detect when the differential current exceeds a predetermined current magnitude, and command the first and second semiconductor switches to operate in the OFF state upon detecting that the differential current exceeds the predetermined current magnitude.

主权项

1. A circuit, comprising:
a non-isolated power supply configured to receive an input voltage and supply an output voltage, the non-isolated power supply including a supply line, a return line, a first semiconductor switch coupled in series in the supply line, and a second semiconductor switch coupled in series in the return line, the first and second semiconductor switches each configured to operate in an ON state, in which electrical current flows through the first and second semiconductor switches, and an OFF state, in which electrical current does not flow through the first and second semiconductor switches; a differential current sensor configured to sense differential current between the supply line and the return line; and fault detection logic coupled to the differential current sensor, the first semiconductor switch, and the second semiconductor switch, the fault detection logic configured to:
detect when the differential current exceeds a predetermined current magnitude, andcommand the first and second semiconductor switches to operate in the OFF state upon detecting that the differential current exceeds the predetermined current magnitude.