Patent ID: 9401653
Filing Date: 2016-07-26
CPC Classification: H02M,Y02B

Claim Text:
1. A method used in a circuit comprising a first converter stage of a power converter circuit implementing a push-pull topology, and an isolating element comprising a magnetizing inductance for isolating a primary side of the first converter stage from a secondary side of the first converter stage, the method comprising: varying a switching frequency of the power converter circuit by causing the magnetizing inductance of the isolating element to vary over a range of values of input current flowing through the primary side of the first converter stage, holding a duty cycle of the power converter circuit to be substantially constant during the variation of the switching frequency of the power converter circuit, lowering a minimum value of the duty cycle to extend a range of control over the input current flowing through the primary side of the first converter stage and adjusting a current conduction angle of the input current.