Ultra-wide input range switching power supply for circuit protection devices

摘要

A wide input range switching power supply for a circuit protection device includes a rectifier circuit for rectifying an AC line voltage at a supply input, and a switch-mode DC-to-DC converter coupled to the rectifier circuit for providing a low voltage DC power to a load at a supply output. The converter includes a switch having an open state and a closed state and a control circuit for controlling the state of the switch. The control circuit is operatively coupled to receive operating power from the supply output.