Patent ID: 6809503
Filing Date: 2004-10-26
Classification: H02M,Y02B

Abstract:
A switch recovery circuit for use in conjunction with a switch and an input energy source, comprising:a first inductor coupled between the switch and the input energy source; a second inductor magnetically coupled to said first inductor; a first capacitor with first and second terminals coupled between said first and second inductors such that said first terminal is associated with said first inductor and said second terminal is associated with said second inductor; a first switching device coupled to said second inductor such that said switching device is capable of preventing current from flowing through said second inductor in at least one direction; wherein the polarity of the magnetic coupling between said first inductor and said second inductor is such that changes in voltage across said first inductor with respect to said first terminal of said capacitor correspond to the same polarity changes in voltage across said second inductor with respect to said second terminal of the capacitor; and said first inductor is coupled to said first capacitor such that current flows from said first inductor to said first capacitor at least at some point in time while said switch is open.