Patent ID: 7474146
Filing Date: 2009-01-06
Classification: H02J,H02M,Y02B,Y04S

Abstract:
1. A standby power supply system, applied to an electronic device, the electronic device comprising an operation power supply and a power load, the standby power supply system comprising: a signal sensor, for receiving a system power-on signal inputted by a user, and accordingly generating a charging signal and a power actuation signal; a standby power source, coupled to the signal sensor for supplying power to the signal sensor; a switch circuit, coupled to the standby power source and the signal sensor for receiving the charging signal and accordingly turning on the switch circuit for a period of preset charge time; a charging circuit, coupled to the switch circuit, wherein when the switch circuit is turned on, the standby power source charges the charging circuit; and a power control unit, coupled to the charging circuit and the signal sensor, wherein when the charging circuit is charged to a preset voltage, the charging circuit actuates the power control unit to receive the power actuation signal and accordingly actuate the operation power supply such that the operation power supply can supply an operational voltage to the power load; wherein the preset charge time is at least enough for the standby power source to charge the charging circuit to the preset voltage.