Patent ID: 9601996
Date: 2017-03-21
CPC Classifications: H02M

Claim:
1. A switching power supply apparatus comprising: a switching element that is turned on/off to intermittently conduct current input via a first inductor; a conduction path that supplies current input via the first inductor to a load during a period in which the switching element is turned off; a first rectifying element provided in the conduction path and supplying current to the load; a second inductor provided in the conduction path and connected in series with the first rectifying element; and a second rectifying element having a reverse recovery time shorter than a reverse recovery time of the first rectifying element, the second rectifying element being connected in parallel with the second inductor that supplies current to the load; wherein during a rectification operation of the first rectifying element, the reverse recovery time of the second rectifying element ends, and when the switching element turns on, current loss due to reverse current of the first rectifying element is prevented by the second inductor; and reverse voltage generated during an on period of the switching element is applied to the first rectifying element and not to the second rectifying element.