Patent ID: 7932632

Claim:
A switching power supply: a soft start circuit; a rectifying circuit electrically communicating with the soft start circuit; a filter capacitor electrically communicating with an output of the rectifying circuit; a main power supply in parallel with the filter capacitor; an auxiliary power supply electrically connected to the rectifying circuit and a monitoring circuit that detects voltage and is responsive to the detected voltage; wherein the soft start circuit includes a soft start resistor and in parallel with a first switch and a second switch; wherein after a current is applied to the rectifying circuit and to the filter capacitor via the soft start circuit, resultant rectified current is output to the main power supply and the auxiliary power supply, wherein the auxiliary power supply supplies DC voltage to the monitoring circuit; wherein the monitoring circuit voltage associated with the main power supply and controls the first switch in accordance therewith; wherein the second switch is connected in series with the soft start resistor wherein the monitoring circuit controls an ON or OFF state of the second switch.