Patent ID: 6108219
Filing Date: 2000-08-22
Classification: H02M

Abstract:
A self oscillating power converter circuit having:(a) a source of direct current voltage;(b) a drive transformer having first and second primary windings and a first control terminal winding for generating a first control voltage, said first control terminal winding being transformer coupled to said first primary winding;(c) first and second transistors connected across said first and second primary windings, said first transistor having a first control terminal coupled to said first control terminal winding, said first control terminal having a first control terminal capacitance, said first control terminal capacitance being charged in response to said first control voltage, and said first and second transistors alternately being turned on and off;(d) a first feedback path for said first transistor including said first control terminal winding, said first control terminal winding being phased with said first primary winding such that said direct current voltage provides regenerative feedback at said first transistor control terminal;(e) a first resistance coupled between said first control terminal and said first primary winding for discharging said first control terminal capacitance, and;(f) a first coupling capacitance coupled to said first transistor control terminal for allowing said first control terminal capacitance to be discharged through said first resistance,wherein said first resistance is coupled in parallel with the combination of said first control terminal winding and said first coupling capacitance and wherein said first transistor turns on in response to the charging of said first control terminal capacitance and turns off in response to the discharging of said first control terminal capacitance.