小功率金卤灯电子镇流器控制策略研究  

New control strategy of electronic ballast for low-wattage MH lamps

作　　者：林国庆[1] 郑园圆[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350002

出　　处：《电工电能新技术》2010年第2期13-16,共4页Advanced Technology of Electrical Engineering and Energy

基　　金：福建省自然科学基金资助项目(2008J0147)

摘　　要：本文提出一种适用于金卤灯负载特性的新型控制策略,解决了半桥低频方波变换器用作金卤灯电子镇流器时开路电压偏低的问题、实现了灯启动过程的恒流和限流控制、稳态时的恒功率控制。采用零电流检测电路使电感在低频正负半周内均工作在临界电流模式,开关管实现了零电流接通。采用差分平衡电路对灯电压、灯电流进行取样,解决了悬浮的灯电压、电流信号与驱动电路的共地问题。给出了主要参数的计算方法。实验结果验证了所提出的方案是可行的。A novel control strategy to match the dynamic characteristics of MH lamps is proposed in the paper, the required open-circuit voltage for MH lamps stand-up is obtained and the current control in stand-up process and the constant power control in steady operation are realized. Because of ZCS （Zero-current-switching） operation, the circuit can work in high switching frequency while achieving high efficiency. A differential amplifier is used to sam- ple the lamp voltage and current signal, and to realize the common ground of the floating lamp signal and the drive circuit of half-bridge inverter. The circuit operation and control method are detailed and the main parameters are calculated. The experimental measurements are used to verify the theoretical prediction and analytical discussion.

关 键 词：MH灯 电子镇流器 控制策略 零电流 

分 类 号：TM5[电气工程—电器]