Patent ID: 6434024
Filing Date: 2002-08-13
Classification: H02J,H02M,Y02B

Abstract:
A power supply apparatus, comprising:a power supply transformer; an excitation circuit portion to be provided on a primary side of said power supply transformer and to excite said power supply transformer with an alternating current power supply; and a control circuit portion provided on a secondary side of said power supply transformer, to start an operation by said power supply transformer in an excitation state, and to cause said excitation circuit portion to operate intermittently; wherein said control circuit portion halts the excitation operation of said power supply transformer by said excitation circuit portion when the charged voltage value of a secondary side voltage accumulating capacitor charged by said power supply transformer in said excitation state exceeds a first threshold level; and after said power supply transformer halts the excitation operation, said control circuit portion resumes the excitation operation of said power supply transformer by said excitation circuit portion when a charged voltage value of said secondary side voltage accumulating capacitor drops due to a discharge to reach lower than a second threshold level.