Push-pull switching power supply having increased efficiency and

Details Push-pull switching power supply having increased efficiency and Push-pull switching power supply having increased efficiency and

1998-03-31

1999-04-06

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

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

363134, H02M 3335

Patent

active

058926666

ABSTRACT:
This push-pull switching power supply outperforms its counterparts. Each switch has twice the voltage ratings. However, only two main switches have current ratings as all four switches of the full-bridge power supply. That is only one half the current ratings of both switches of the half-bridge power supply. The input voltage is applied to a center tap of transformer's primary winding. The main switches are coupled thereacross for alternately applying the primary current to ground. Two diodes apply the leakage current of the transformer to a single capacitor. One or two auxiliary switches apply the primary current to the capacitor, whereby the leakage energy stored therein is immediately returned to the transformer. The auxiliary switches operate only a mere fraction of the time and thus their peak rather than continuous current ratings matter. The efficiency is significantly increased as a passive snubber network is eliminated and a reverse energy flow is prevented. Moreover, zero voltage and zero current switching is accomplished. Power factor correction implements a current-fed mode. A parallel operation is achieved, wherein the primary current derives from the line and the capacitor. A low voltage version requires no auxiliary switches.

REFERENCES:
patent: 4628430 (1986-12-01), Mastner
patent: 4656570 (1987-04-01), Swoboda
patent: 4782438 (1988-11-01), Gilliland
patent: 4893227 (1990-01-01), Gallios et al.
patent: 4901216 (1990-02-01), Small
patent: 5019959 (1991-05-01), MacDonald et al.
patent: 5684680 (1997-11-01), Tahhan et al.
patent: 5687066 (1997-11-01), Cook, II

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