Patent ID: 6975070

Claim:
A power source apparatus comprising: an output controlling switch operable to intermittently carry an electric current by repeating on and off; an output coil operable to accumulate energy according to the current flowing into said output controlling switch when said output controlling switch is turned on and to output an electric power based on the accumulated energy when said output controlling switch is turned off; an end detecting unit operable to detect that said output coil ends the output of the power; and an output controlling unit operable to switch said output controlling switch on and off, wherein said output controlling unit comprises: a time memorizing unit that memorizes OFF time for which said output controlling switch should be kept off; a switch controlling unit that switches said output controlling switch on and off based on the OFF time memorized in said time memorizing unit; and a time changing unit that changes the OFF time memorized in said time memorizing unit, wherein said time changing unit increases the OFF time when said end detecting unit is not detecting the end of the output and decreases the OFF time when said end detecting unit is detecting the end of the output, in the timing when said output controlling switch is turned on.