Patent ID: 9553521
Date: 2017-01-24
CPC Classifications: H02M,Y02B

Claim:
1. A power supply device comprising: a first switching device that controls supply of electricity from an external power supply to a primary winding of a transformer; a capacitor that is connected, in series, to a secondary winding of the transformer; a second switching device that is connected, in parallel, to the secondary winding and the capacitor; a rectifying device that is connected, in parallel, to the second switching device; and a switch control unit that acquires a value obtained by measuring a current flowing through the second switching device, obtains, from a measurement result of the current, a first time period from when an off signal is sent to the second switching device until when an on signal is sent to the first switching device and a second time period from when an off signal is sent to the first switching device until when an on signal is sent to the second switching device and that controls, according to the first time period and the second time period, conduction of the first switching device and the second switching device.