Patent ID: 6304463
Filing Date: 2001-10-16
Classification: H02M

Abstract:
A single-ended voltage converter comprising:a power transformer having a primary winding and a secondary winding;a primary switch and an input voltage source coupled in series with said primary winding of said transformer, said primary switch being periodically made active upon application of a control input to permit current flow through said primary winding, said primary switch further having a parasitic capacitance; anda reset circuit comprising an auxiliary switch, an auxiliary voltage source coupled to said auxiliary switch, and a diode coupled between said auxiliary switch and said secondary winding of said transformer, said auxiliary switch being active when said primary switch is inactive, wherein said transformer is reset upon said primary switch becoming inactive in part by resonating magnetizing and leakage energy from said transformer to said parasitic capacitance and in part by clamping said secondary winding of said transformer to said auxiliary voltage source through said auxiliary switch and said diode.