Patent ID: 6072702
Filing Date: 2000-06-06
Classification: H02M

Abstract:
A ringing choke converter, wherein:one end of a primary winding of a transformer is connected to one input terminal;the other end of said primary winding is connected to a collector of a switching transistor;an emitter of said switching transistor is connected to the other input terminal;an output of a secondary winding of said transformer is connected to output terminals via a rectifying/smoothing circuit;one end of a base winding of said transformer is connected to a base of said switching transistor via a base driving device, and the other end of said base winding is connected to the emitter of said switching transistor, in order to turn on and off said switching transistor repetitively by self-oscillation;a turn-off control system is provided therewith for stabilizing the voltage at the output terminals by variably controlling a turn-off timing of said switching transistor according to a voltage detected directly or indirectly at said output terminals; anda turn-on control system is provided therewith which detects a change in circuit operation when said switching transistor is turned off, and forcedly turns on said switching transistor when a predetermined period of time elapsed after said detection of change.