Patent ID: 9112421
Filing Date: 2015-08-18
Classification: H02M

Abstract:
1. A converter circuit comprising: a transformer having a first primary winding, a second primary winding and a secondary winding; a rectifier circuit connected between the secondary winding and a load; a first oscillation circuit connected to a first DC power source and the first primary winding; a second oscillation circuit connected to a second DC power source and the second primary winding; and a control circuit configured to control the first and the second oscillation circuits, wherein each of the first and the second oscillation circuits includes at least one switch element having no body diode, wherein at least one of the first and the second primary windings have a number of turns which are variable, and wherein the first and the second primary windings are configured such that a ratio n2/n1 is allowed to be selectively switched between n2/n1=Vref2/Vref1 and n2/n1>Vref2/Vref1, where n1 and n2 are numbers of turns of the first and the second primary windings, respectively; and Vref1 and Vref2 are reference voltages of the first and the second DC power sources, respectively.