一种全桥同步整流器的设计及其应用

一般在AC／DC开关电源的输入级会加入一个全桥整流器，将电网的交流电压变为脉动的直流，以便之后DC—DC变换器的处理。由于传统桥式整流器的整流二极管存在约1V的电压降，当系统功率较大时，此整流桥将消耗一部分能量，这部分能量损失使得在设计系统时需进行额外的散热处理。同时这部分损失的能量也降低了AC／DC电源的系统效率。文中从用N沟道的增强型MOSFET构建全桥同步整流器，并引入相应控制信号对其进行全桥同步整流，仿真结果达到了设计要求。

Design of a Full-Bridge Synchronous Rectifier and its Application

Generally a full-bridge rectifier is added to the AC/DC switching power supply input stage to convert the AC voltage grid into a pulsating direct current for later processing by the DC-DC converter.As the traditional rectifier diode bridge rectifier has a voltage drop of about 1 V,it will consume some energy when the system power is large.This energy loss makes extra heat treatment necessary in the design of the system.And this loss also reduces the AC/DC power system efficiency.In this paper,with the N-channel enhancement-mode MOSFET we build a full-bridge synchronous rectifier control signal and introduce its corresponding control signal for full-bridge synchronous rectification.The simulation result meets the requirement of the design.