Stand-by power supply shutdown at power on

摘要

A stand-by power supply circuit is provided that controls power consumption and decreases electromagnetic interference during operation of a television. In one embodiment, the stand-by power supply circuit is connected to a switch that is connected to an AC line. The switch is located a prearranged distance from a main power supply circuit and provides a method for reducing the electromagnetic interference caused by the stand-by power supply circuit in an operating television by disconnecting the AC line from the stand-by power supply circuit and connecting the AC line to the main power supply circuit via the switch during a power-on mode/operation. In another embodiment, the switch includes a stand-by power supply circuit switch and a main power supply circuit switch which provide proper timing for the connection of the AC line to the main power supply circuit and the disconnection of the AC line from the stand-by power supply circuit to guarantee uninterrupted and cost-effective power consumption during the power-on operation.