Patent ID: 6680463
Filing Date: 2004-01-20
Classification: H05B

Abstract:
A power supply control circuit comprising:a control power supply unit to which electric power is supplied from power lines via a starting power supplying switch; a controller, to which electric power is supplied from the control power supply unit, for controlling power supply from a power source to a load; and a serial circuit of a power supply holding switch and a radio interference suppression capacitor, which is connected between the power lines, the power supply holding switch being controlled to be in an on-state in response to the power supply to the controller, and maintaining the power supply from the power lines to the control power supply unit until the power supply holding switch is controlled to be in an off-state, wherein a node of the power supply holding switch and the radio interference suppression capacitor is connected to a node of the starting power supplying switch and the control power supply unit, whereby electric power is supplied to the control power supply unit via the power supply holding switch.