Switching power supply circuit

Details Switching power supply circuit Switching power supply circuit

2006-04-05

2008-03-04

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S037000, C363S040000, C363S131000

Reexamination Certificate

active

07339801

ABSTRACT:
The present invention provides a voltage resonant converter that achieves ZVS over the entire allowable load range. A switching power supply circuit includes a class-E resonant converter as its primary-side switching converter that is supplied with a DC input voltage arising from the rectification and smoothing of a commercial AC voltage by a rectifier circuit (including a smoothing capacitor Ci). A choke coil of a primary-side series resonant circuit in the class-E switching converter is used as a primary winding N1in an isolation converter transformer PIT. The total coupling coefficient between the primary side and secondary side is set to about 0.65 by the coupling coefficient of the isolation converter transformer PIT itself and equivalent parallel connection between a choke coil L10and the primary winding N1. The resonant frequency fo1of a primary-side parallel resonant circuit and the resonant frequency fo2of the primary-side series resonant circuit are set to almost the same value of about 60 kHz.

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