新型HID灯电子镇流器电路拓扑的研究

Research on a Novel Circuit Topology for Electronic Ballast of HID Lamps

提出一种基于非对称半桥结构的新型电子镇流器电路,由提供高频方波电压的半桥逆变电路和将电流波形滤波成准正弦波的谐振电路组成。通过非对称PWM控制驱动,能有效调节灯功率,实现软开关,并保持放电灯的稳定工作和电子镇流器的可靠性,实现了电子镇流器在高强度放电(High Intensity Discharging,简称HID)灯中应用的一些关键技术。最终研制出一套300W的样机用于验证所提电路拓扑和控制方法的正确性。

A novel cost-effective electronic ballast with asymmetric control is proposed for high intensity discharging （HID）lamp.The ballast topology is composed of a half-bridge inverter to supply the lamp with high-frequency square-wave voltage and a serial resonant circuit to filter the lamp current into quasi-sine wave.The asymmetric control with the fixed frequency PWM can regulate the lamp power and make the switches of the inverter turn on softly.Constant lamp current control is achieved in the ballast by adjusting the duty cycle at fixed time range,which makes the lamp work steadily.A rated power 300 W prototype ballast demonstrates the proposed topology and the control method.