金属卤化物灯电子镇流器研究

:本文提出了一种在高频下工作的金属卤化物灯电子镇流器,分析了其电路组成及工作原理,由于高频开关管实现了零电压通断,提高了工作效率;利用纹波电压作为调制信号对灯电流进行频率和幅值调制,避免了声共振的发生;采用扫频谐振方式产生高压触发脉冲,触发可靠;与传统低频方波工作方式相比,结构简单、所用器件少、效率高、可靠性高.实验结果验证了该方案是可行的.

Research on high-frequency electronic ballast for MH lamps

A high-frequency electronic ballast is proposed to operate MH lamps in the paper. The circuit composition and operating principle are detailed. Because of ZVS (Zero-voltage-switching) operation, it can work in high switching frequency while achieving higher efficiency. The frequency and amplitude modulation of the inverter switching pattern is used to prevent the acoustic resonance. A high-voltage ignition pulse is made by sweep frequency resonance mode and possibly increases ignition reliability. The proposed electronic ballast can eliminate a controller and three active switches, reduce size and possibly increase system efficiency and reliability over a conventional low-frequency square-wave system. The experimental measurements are used to verify the theoretical prediction and analytical discussion.