Patent ID: 7274116
Filing Date: 2007-09-25
Classification: H02J,H02M

Abstract:
1. A direct-current power supply comprising: a DC-DC converter, by its switching operation, converting an input voltage applied from an external direct-current power supply into an output voltage equal to or higher than the input voltage, and applying the output voltage to an external load; a converter control section comparing said output voltage with a desired voltage, and, based on their difference, controlling said switching operation of said DC-DC converter; a bypass switch shorting between the input and output of said DC-DC converter; and a bypass control section maintaining said bypass switch in the ON state during non-operation of said DC-DC converter, and at the start of said switching operation of said DC-DC converter, further maintaining said bypass switch in the ON state for a time period after the start of said switching operation, wherein the time period is set to prevent or suppress undershoot.