Patent ID: 9735691
Date: 2017-08-15
CPC Classifications: H02M,Y02B

Claim:
1. A power supply device comprising: a switching element configured to perform synchronous rectification on a power to be induced in a first secondary wiring of a transformer configured to perform voltage conversion; a first current detection circuit configured to detect a value of a current to be induced in a second secondary wiring of the transformer; a second current detection circuit configured to detect a change in the current to be induced in the second secondary wiring, the second current detection circuit having a higher response speed with respect to conversion of the current than that of the first current detection circuit; and a control unit configured to the second current detection circuit is configured to detect a minimum value of values of the current, and the control unit is configured to, in a first case that the minimum value is detected by the second current detection circuit, determine that backflow is occurring.