Active snubber

Details Active snubber Active snubber

2003-02-11

2008-08-05

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Including automatic or integral protection means

C363S056120

Reexamination Certificate

active

07408793

ABSTRACT:
An improved snubber is electrically switched to close a current path to a capacitor (C) in a series connected RC circuit at the onset of an abrupt voltage change otherwise producing ringing in a resonant circuit to which the snubber circuit is connected. The current path to the capacitor (C) is then interrupted before the capacitor (C) discharges and thereafter at each such voltage change in the resonant circuit the capacitor (C) is no longer charged from its totally discharged state but nevertheless damps the ringing by virtue of current flow to the nearly completely charged capacitor (C). By preventing complete charging and discharging of the capacitor (C) in the RC circuit every cycle, power dissipation in the resistance of the snubber circuit is greatly reduced.

REFERENCES:
patent: 4272705 (1981-06-01), Beaumont
patent: 4814966 (1989-03-01), Ekstrand
patent: 5877947 (1999-03-01), Chen et al.
patent: 6051961 (2000-04-01), Jang et al.
patent: 6069803 (2000-05-01), Cross

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