软开关PWM控制器的新型开关电源设计

近年来，电子产品的工作电压不断降低，但是耗电电流却在不断增加。因此，开发大功率开关电源在通信以及军工领域有很大的发展空间。阐述了有源钳位开关的基本原理，基于电流控制型芯片UCC2891设计出了一种3．0V／30A的同步整流有源钳位正激变换器开关电源，给出了电路设计、电路图以及最后的测试结果。实验结果证明，采用ZVS（零电压开关）技术的电源具有较好的稳定性和较高的转换效率，在很宽的输入电流和输出电压的范围内效率仍可高于90％。

A New Switching Power Supply Based on Soft Switch PWM Controller

Recently, with working voltage of electronic products decreased from 3 V to 1 V, prospect the current consumption increases continually. So, development high-power switching power supply has good prospect in communication and defense industry. This paper presents the basic principle of active clamp switch. Based on the current control chip UCC2891, a 3.0 V/30 A switching power supply using synchronous rectification active clamp forward converter is designed. Circuit design, circuit diagram and final results of test are provided. Experimental results show that the power supply is stable and efficient. Efficiency is higher than 90 percent in very wide range of input current and output voltage.