A SYNCHRONOUS RECTIFYING CIRCUIT FOR FLEXIBLE SWITCHING POWER CONVERTER

• Main Authors: HSU, WEILI, WANG, CHOUSHENG, YANG, TAYUNG
• Format: Patent
• Language: Chinese; English; French
• Published: 03.09.2009
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

A synchronous rectifying circuit for flexible switching power converter, has a transformer, the synchronous rectifying circuit has a current transformer which generates a switch current signal according to the switching of the transformer and an integrated synchronous rectifier. The rectifier has a power transistor and a controller. The power transistor for rectifying is coupled to the transformer and an output of the power converter. The controller generates a drive signal according to the switch current signal to control the power transistor. The controller generates a start signal when the switch current signal is higher than a first predetermined value, and generates a stop signal when the switch current signal is lower than a second predetermined value. The start signal enables the drive signal for opening the power transistor. The stop signal disables the drive signal for shutting the power transistor. La présente invention concerne un circuit de rectification synchrone pour un convertisseur de puissanc