Patent ID: 7196918
Filing Date: 2007-03-27
Classification: H02M,Y02B

Abstract:
1. A capacitive drop power supply circuit for use in a home appliance, comprising: a rectifier electrically connected to an AC power source and operable to convert an AC power signal to a DC voltage; a current limiting capacitance interposed between the AC power source and the rectifier; a low voltage output stage having an output terminal for connection to a low voltage load, the low voltage output stage receiving the DC voltage from the rectifier and operable to output the DC voltage at the output terminal; a higher voltage output stage having an output terminal for connection to a higher voltage load, the higher voltage output stage connected in series with the low voltage stage and operable to output the DC voltage at the output terminal; and a shunt circuit path connected in parallel across the higher voltage output stage and comprising a first switching circuit that turns ON based on a standby control signal provided to a second switching circuit that regulates the shunt circuit path, the second switching circuit connecting to the first switching circuit, wherein the shunt circuit path operates to reduce real power consumption when a NO LOAD condition is placed on the higher voltage output stage.