Switching power supply unit

Details Switching power supply unit Switching power supply unit

2011-08-23

2011-08-23

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C363S017000

Reexamination Certificate

active

08004867

ABSTRACT:
A witching power supply unit, which suppresses switching loss in switching elements and surge voltage onto an output rectifier device and reduces the number of components, is provided. The switching power supply unit include: a switching circuit of full bridge type disposed on the input side; a rectifier circuit disposed on the output side; a transformer disposed between the switching circuit and the rectifier circuit and including a first winding on the input side, a second winding on the output side, a third winding; a surge voltage suppressing circuit connected in parallel with the switching circuit; and a driving circuit. The third winding is connected to the full bridge circuit to form a H-bridge configuration. Magnetic coupling between the first and second windings and magnetic coupling between the first and third windings are both looser than that between the second and third windings.

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