AN SYNCHRONOUS RECTIFICATION TYPE POWER SUPPLY

摘要

PURPOSE: A synchronous rectification type power supply is provided to remove the breakdown of a switch element by detecting a current level and a duty ratio of a main switch and controlling a rectifier element. CONSTITUTION: In a synchronous rectification type power supply, an input unit(10) switches the supply of inputted power. An output unit(20) outputs the input power source to a load. A current sensor(30) senses the current of the power source. A voltage sensor portion(40) senses the voltage of the power source. A first pulse duration modulation circuit part(50) outputs a pulse-width modulating signal for controlling the switching of the input unit. A gate driver(60) outputs a gate signal to the input unit. A second pulse duration modulation circuit part(70) controls the motive switching the power of the output unit.