A high-power-factor high-efficiency electronic ballast for high intensity discharge lamp (HID) applications is presented in this paper. The electronic ballast consists of a boost type power factor corrected rectifier, a full bridge inverter, and a resonant tank. The power factor pre-regulator produces sinusoidal input current in phase with mains voltage. The phase-shift PWM scheme for full bridge inverter is adopted. In this control scheme, the constant switching frequency with variable duty cycle is used for dimming control. The series-resonant parallel-loaded circuit is used to drive the metal halide lamp (MHL), one of the high intensity discharge lamp. The over-voltage and over-current protection circuits are also considered in a 70 W MHL hardware prototype for safety operation. Finally, experimental results are presented to verify the characteristics of high power factor and dimming control of electronic ballast for metal halide lamp.
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机译：本文介绍了一种用于高强度放电灯（HID）应用的高功率因数高效电子镇流器。电子镇流器由一个升压型功率因数校正整流器，一个全桥逆变器和一个谐振箱组成。功率因数预调节器产生与电源电压同相的正弦输入电流。采用全桥逆变器的相移PWM方案。在该控制方案中，具有可变占空比的恒定开关频率用于调光控制。串联谐振并联负载电路用于驱动高强度放电灯之一的金属卤化物灯（MHL）。 70 W MHL硬件原型中还考虑了过压和过流保护电路，以确保安全运行。最后，通过实验结果验证了金卤灯电子镇流器的高功率因数和调光控制特性。
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