降低全桥变换器轻载损耗的方法  

The Method to Reduce Light Load Loss for Full-bridge Converter

作　　者：颜红[1] 程荣龙[1] 王艳春[1] 

机构地区：[1]蚌埠学院机械与电子工程系,安徽蚌埠233030

出　　处：《蚌埠学院学报》2012年第6期10-13,共4页Journal of Bengbu University

摘　　要：全桥变换器广泛应用于中大功率场合,由于其开关管较多,频率较高,其轻载包括待机损耗都较大。首先分析了影响全桥变换器轻载时损耗的因素,指出开关管的开关损耗占主要成分,其中频率及开关管数量是决定性因素。然后对现有的降低轻载损耗的各种方法进行了比较。基于以上分析,提出将移相控制和双极性控制方式相结合,并增加了开关管较少的反激辅助电路,有效地降低了全桥变换器轻载时的效率。最后进行实验验证,证明了所提方法的有效性。Full-bridge （FB） converter is widely used under the middle and high power applications. But it has high light load and standby loss because of more switches and high frequency. Firstly, It analyzes the factors influencing the light load loss, and indicates that the frequency and quantities of the switch are determining factors. It analyzes and compares with the usual methods of reducing light load loss. Based on which, It develops a new method. The method integrates the phase-shifted control and bipolar control, and adds flyback auxiliary circuit to reduce the light load loss. At last, experiments are done to prove the effectiveness of the method.

关 键 词：全桥变换器 轻载 待机损耗 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]