Discharging circuit and power supply

摘要

A discharging circuit includes a filter unit connected between the input lines of a commercial AC power supply, a switch whose operations are controlled by the filter unit; and a discharging unit which discharges voltage of the capacitance element when the switch unit is turned on.

主权项

1. A discharging circuit which discharges voltage of a first capacitance element connected between input lines for AC voltage to be input from a commercial AC power supply, the discharging circuit comprising:
a first discharge element connected between the input lines and configured to discharge voltage of the first capacitance element; a switch connected to the first discharge element in series; and a second capacitance element connected to the switch, wherein the switch is turned on or off according to a voltage of the second capacitance element, and a second discharge element connected to the second capacitance element in parallel and configured to discharge voltage of the second capacitance element, wherein the voltage of the second capacitance element becomes larger than a predetermined value and the switch is turned on so as to discharge the voltage of the first capacitance element via the first discharge element in a case where the AC voltage is not input.