Surge protection circuit for a switching mode power supply

Details Surge protection circuit for a switching mode power supply Surge protection circuit for a switching mode power supply

1995-08-25

1997-04-15

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, 363 97, H02M 3335

Patent

active

056216254

ABSTRACT:
A surge protection circuit for a switching mode power supply utilizing the switching phase difference of substantially 180 degree between primary and secondary coils of a switching power supply transformer snubs surges induced on both sides of the power supply transformer by attenuating the surges induced during ON/OFF operations of a switching transistor which controls the power supply transformer. Accordingly, heat caused during the ON/OFF operation of the switching transistor is reduced and secondary rectifier diodes connected to the secondary winding of the power transformer are protected from damages The surge protection circuit uses a pair of capacitors connected in series between a control terminal of the primary coil and an output terminal of the secondary coil of the switching power supply transformer for snubbing bi-directional surges induced by the ON/OFF operation of the switching transistor.

REFERENCES:
patent: 4755922 (1988-07-01), Puvogel
patent: 5029269 (1991-07-01), Elliot
patent: 5075838 (1991-12-01), Schnetzka, II et al.
patent: 5099406 (1992-03-01), Harada
patent: 5227964 (1993-07-01), Furuhata
patent: 5424933 (1995-06-01), Illingworth
patent: 5448469 (1995-09-01), Rilly et al.

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