同步整流驱动电路的研究

Research on Synchronous Rectification Driven

介绍一种信号的传递方式,即通过功率变压器来传递同步整流的驱动信号,而该信号却不会干扰功率的传递。同时在2～3ns的延时里把栅极驱动信号也传递到次级的同步整流管上。功率绕组和信号绕组都放在一块PCB上以减少生产成本和提高功率密度。

This paper presents a method for driving the synchronous rectifier in a forward topology. Synchronous rectification is a commonly used technique to improve the efficiency of DC/DC converters with low output voltages and high output currents. Control of the synchronous rectifiers in forward converters has been accomplished in many different ways,from self-driven to complexly controlled techniques. For optimum driving of the synchronous rectifier in a forward converter,a method of signal transfer through a power transformer without interference with the main power train is presented. The main transformer transfer energy to the secondary and at the same time to transfer the gate signal from the pri-mary side to the secondary side with minimum delay. Both the power winding and the signal transfer winding are incorporated in a PCB to reduce the labor cost.