双Buck逆变器电容均压控制策略研究

双Buck逆变电路效率高、无直通、控制简单,适用于电子镇流器主电路的设计.针对半桥双Buck逆变器中直流分压电容存在电压偏差问题,分析了直流分压电容中点电位偏移的原因,提出采用电容电压偏差前馈控制策略,并通过仿真验证了该控制策略的正确性.运用该控制策略到电子镇流器系统中,可有效地消除直流分压电容电压偏差.

Research on Capacitor Voltage Equalizing Strategy of Dual-Buck Inverter

The dual-Buck inverter circuit is of high efficiency, no direct connection mode and simple control, which applies to the design of main circuits of electronic ballast. From the prospective of the voltage deviation existed in the DC voltage-division capacitor of the half-bridge dual-Buck inverter, this paper analyzes the causes of potential deviation in the DC voltage-division capacitor, puts forward the strategy of feed-forward control for the capacitor voltage deviation, and demonstrates the feasibility of the control strategy by simulation. It is shown that the DC voltage-division capacitor voltage deviation can be eliminated effectively by applying the control strategy to the electronic ballast system.