Snubber circuit for switching power supply

Details Snubber circuit for switching power supply Snubber circuit for switching power supply

1994-06-16

1996-08-20

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363132, H02H 7122

Patent

active

055485030

ABSTRACT:
The present invention provides a snubber circuit for a switching power supply that generates rectified direct current power from an inductive load cyclically connected and disconnected by two switching means fed by a direct current power supply. To reduce turn-on and turn-off loss of the switching means and increase switching frequency by reducing power loss in the snubber circuit, the snubber circuit according to the present invention absorbs counter-electromotive force generated during turn-off of the switching means. Turn-on loss of the switching means is reduced because a current from the switching means does not flow through the snubber circuit when the switching means are turned on. Power consumption in the snubber circuit is reduced and energy is efficiently utilized, because energy, stored in the snubber circuit in association with counter-electromotive force absorption from the inductive load when the switching means are turned off, is regenerated during subsequent turned-off period and turning-on action of the switching means. Additionally, transient voltage spikes are not applied to the switching means during turn-off because the counter-electromotive force is more quickly absorbed in comparison to prior art circuits.

REFERENCES:
patent: 4586118 (1986-04-01), Mihalka
patent: 4792885 (1988-12-01), Cuman et al.
patent: 4805080 (1989-02-01), Nieminen
patent: 5077651 (1991-12-01), Kobayashi et al.

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