METHOD FOR CONTROLLING ON PULSE WIDTH OF SYNCHRONOUS RECTIFIER IN FLYBACK CONVERTOR

摘要

PROBLEM TO BE SOLVED: To realize a control method having reduced power consumption with less number of parts by controlling the drive period of a MOSFET to the constant period for change of an input voltage and causing the synchronous rectification to effectively follow the change of load. ;SOLUTION: A charging circuit and a discharging circuit for controlling the drive of a MOSFET are provided to an auxiliary coil, provided in the secondary side of an inverter/transformer. Accordingly, a gate pulse width of the MOSFET is caused to follow the change in the load, so that a gate pulse of almost the constant width is generated for the change of an input voltage.;COPYRIGHT: (C)2001,JPO