Optimal resetting of the transformer's core in single ended forward converters
Forward converter type of switched power supply
DC/DC converter switching at zero voltage Patent #: 5066900
ApplicationNo. 992274 filed on 12/16/1992
US Classes:363/21.1, Utilizing pulse-width modulation363/56.09Single-ended type
ExaminersPrimary: Beha, William H. Jr.
Attorney, Agent or Firm
Foreign Patent References
International ClassH02M 003/335
AbstractA voltage control circuit comprises a transformer (18) having primary (17) and secondary (20, 21) windings, an input coupled to said primary winding, first and second switch devices (11, 12) each coupled to said primary winding of the transformer, and a clamping capacitor (28) coupled to the transformer and at least one of the first and second switches. An output filter (25, 26) is coupled through a rectifier (23, 24) to the secondary winding of the transformer and an output is taken from the output filter. Means comprising a feedback circuit (13, 14, 15) coupled on one side to the output filter and on the other side to control terminals of the first and second switches cause the first and second switches to conduct current alternately. Operation of the circuit is stabilized by including an interconnection (29) of the clamping capacitor to the feedback circuit for generating a signal that modifies the energy applied by the feedback circuit to the control terminals of the first (11) and second (12) switches.