摘要
研究了一种新颖的双降压式半桥逆变电路 ( Dualbuck half bridge inverter,DBI) ,该电路有无直通 ,效率高等特点。提出了一种 DBI的无偏置电流运行方式和一种滞环电流型双降压式半桥逆变电路 ( Hysteresis currentcontrolled dual buck half bridge inverter,HCDBI) ,消除了采用载波交截 SPWM控制 DBI正常工作所必需的偏置电流 ,进一步提高了效率。对 HCDBI和传统半桥逆变器进行了理论上的损耗计算分析和实验验证 ,证明了HCBBI可大幅降低开关损耗 ,开关频率高 ,滤波器小。为实现逆变器的高频化提供了一种简洁的方法和新的途径。
A highly efficient and re liable topology-dual buck half bridge inverter (DBI) is introduced. The existenc e of discontinuous conduction mode (DCM) operation state requires the bias of in du ctor current for DBI implemented with linear controllers like ramp comparison SP WM (RCSPWM) controllers. A novel operation scheme for DBI and a hysteresis curre nt controlled dual buck half bridge inverter (HCDBI) are proposed. The bias curr ent required by RCSPWM DBI is eliminated and conduction losses are dramatically reduced. HCDBI has greatly improved the modulation performance in DCM region for the benefit of its excellent command tracking capability. The operational schem e and control strategy are presented. Power losses of the conventional half brid ge inverter (CHBI) and HCDBI are compared with mathematical computation, and exp erimental verification is also executed. Both calculational and experimental res ults verify that HCDBI has a superior switching performance over CHBI. Its exce llent high frequency operational capacity provides another access to realize high fre quency operation of inverters.
