| 摘要 |
PROBLEM TO BE SOLVED: To provide a power conversion apparatus in which a noise is small, in which the electric stress of a switching element is small and whose conversion efficiency is good. SOLUTION: In this power conversion apparatus, when a transistor 3 is turned off, surplus electric power from a primary winding 2A and a primary winding 2B is charged in a capacitor 4A and a capacitor 4C. On the other hand, when the transistor 3 is turned on, the charged electric power is commutated by a closed circuit which is composed of the transistor 3, the primary winding 2B, a reflux diode 5B and a reactor 5D while a current peak is being suppressed by the reactor 5D, and electric power is transmitted to a secondary circuit 6. Accordingly, the surplus electric poweris not wasted, and the capacitors 4A, 4C are discharged completely until the transistor 3 is turned off again. As a result, even when the surplus electric power is generated again, the voltage rise rate of the collector-to-emitter voltage of the transistor is suppressed, and also a noise can be removed. |
