Patent ID: 8749210

Claim:
A power supply device comprising: a first serial circuit coupled between a first output terminal and a second output terminal, and including a first switching element and a first rectification element; a second serial circuit coupled between the first output terminal and the second output terminal, and including a second switching element and a second rectification element; a first inductor inserted between a connection point between the first switching element and the first rectification element, and a first input terminal of an AC input; a second inductor inserted between a connection point between the second switching element and the second rectification element, and a second input terminal of the AC input; a third switching element inserted between a connection point between the first inductor and the first input terminal, and the second output terminal; a fourth switching element inserted between a connection point between the second inductor and the second input terminal, and the second output terminal; a control circuit configured to control the first and second switching elements; and a synchronous rectification control circuit configured to control the third and fourth switching elements.