Patent ID: 6496395
Filing Date: 2002-12-17
Classification: H02M,Y02B

Abstract:
A direct-current power-supply apparatus comprising a switching converter and a control circuit wherein:said switching converter comprises: a main switch device for generating a pulse voltage from a direct-current input; a synchronous-rectification circuit for converting said pulse voltage into a direct-current voltage; a reverse-current-blocking device for blocking a reverse current from a load; and an output terminal connected to the load through said reverse-current-blocking device; said control circuit is used for controlling said switching converter by detection of a voltage and a current, which are output by said switching converter, so as to set said output voltage at a predetermined level; said control circuit comprises: a maximum-current follow-up control unit for controlling a current to be borne by said switching converter in a parallel operation; a PWM formation unit for driving said main switch device employed in said switching converter; a synchronous-rectification control unit for generating a signal for driving said synchronous-rectification circuit; and a driving control unit for controlling an operation to drive said reverse-current-blocking switch device; and said maximum-current follow-up control unit, said PWM formation unit, said synchronous-rectification control unit and said driving control unit operate with an electric potential at said output terminal of the switching converter used as a reference electric potential.