一种新颖的滞环电流型双降压式半桥逆变器

Novel Curret Mode Controlled Bi-Buck Half Bridge Inverter

研究了一种新颖的双降压式半桥逆变电路 ( BBI) ,该电路有无直通 ,效率高等特点。提出了一种滞环电流型双降压式半桥逆变电路 ( HCBBI) ,消除了采用载波交截 SPWM控制 BBI正常工作所必需的偏置电流 ,进一步提高了效率。对 HCBBI和传统半桥逆变器 ( CHBI)进行了理论上的损耗计算分析和实验验证 ,证明了 HCBBI可大大降低开关损耗。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 efficient and reliable topology--Bi buck half bridge inverter (BBI) is introduced. The existence of discontinuous current mode (DCM) operation state requires the bias of inductor current for BBI implemented with linear controllers like Ramp comparison SPWM (RCSPWM) controllers. A novel operation scheme for BBI and a hysteresis current controlled Bi buck inverter (HCBBI) are proposed. The bias current required by RCSPWM BBI is eliminated and conduction losses are dramatically reduced. HCBBI has greatly improved modulation performance in DCM region for the benefit of its excellent command tracking capability. Thus low load voltage distortion is guaranteed. The operational scheme and the control strategy are presented. Power losses of conventional half bridge inverter (CHBI) and HCBBI are compared by mathematical computation, and experimental verification is also executed. Both calculational and experimental results verify HCBBI′s superior switching performance over CHBI. The unique features such as high reliability, excellent high frequency operation capacity, and wide system bandwidth, make HCBBI an attractive alternative in inverter applications.