Study and implementation of a two-stage electronic ballast for metal halide lamp

C. Chiang, T. Liang, Jia-You Lee, Jhih-Sian Li
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Abstract

A two-stage electronic ballast for 400-W metal halide lamp with frequency modulation control is presented in this thesis. This electronic ballast consists of a boost PFC stage, SRPL half bridge inverter stage, frequency modulation control circuit and constant power control circuit with digital microcontroller PIC12F675. The boost PFC circuit is operating in continuous conduction mode to achieve high power factor, and the SPRL half bridge inverter driving, supply the HID lamp with a high frequency sinusoidal wave current by frequency modulation to avoid acoustic resonance. Finally, a laboratory prototype of 400 W electronic ballast for metal halide lamp with 90~264 Vac universal input voltage is implemented. The measured results show that the proposed ballast can be applied for various HID lamps with low lamp power variation. The maximum power factor is 0.99 and the maximum efficiency of the ballast is 94.8%.
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金属卤化物灯两级电子镇流器的研究与实现
本文介绍了一种变频控制的400w金属卤化物灯两级电子镇流器。该电子镇流器由升压PFC级、SRPL半桥逆变级、调频控制电路和以PIC12F675为单片机的恒功率控制电路组成。升压PFC电路工作在连续导通模式,实现高功率因数,SPRL半桥逆变器驱动,通过调频为HID灯提供高频正弦波电流,避免声谐振。最后,实现了通用输入电压为90~264 Vac的400 W金属卤化物灯电子镇流器的实验室样机。实测结果表明,该镇流器可适用于各种灯功率变化小的HID灯。最大功率因数为0.99,镇流器的最大效率为94.8%。
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