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After the development of railway, locomotive make an important role in human’s development of transportation and civilization. With the quick development of motorcycle technology this years, requirements of lighting improve also. High Intensity Discharge Lamp(HID Lamp) to be as a hotly lighting in the 21st century, with the characteristic of small size, high light effect and perfect color rendering, long natural life, it will have a perfect prospects in the area of locomotive lighting.HID Lamp have widely be used in the field of car’s headlamp, also extend to field of locomotive’s headlamp step by step, then to be as a traditional halogen headlamp, it will drop out the leading place. At the same time technology of HID Lamp ballast also have maturing development, it has the characteristic of small size high effective and perfect stability which can overcome the defect of traditional inductive ballast. The digital power technology with the core of MCU not only has the basic characteristics of traditional analog power technology, but also can achieve the communication, automation, soft switching and other special design requirements, applied to HID Lamp ballast has become a new hot spot in the area of locomotive’s headlamp research and development.This paper first analyzes the current domestic and international locomotive headlights and HID Lamp ballasts the basic situation, combined with the working principle of HID Lamps, the volt-ampere characteristics of gas-discharge, transition characteristics, comprehensive study the feasibility of locomotive’s HID Lamp ballast using MCU from basic topology, full bridge inverter, control system and other key technologies. On the basis of this theory, has produced a prototype of HID Lamp ballast, papers have detail introduce on the concrete steps in flyback converter circuit and RCD circuit in hardware, select chips for H-bridge drive circuit, high voltage trigger and control circuit. combination with programming environment, introduce the software controlled process, the main program loop, and describes the PSC module, soft switching module, A/D sampling module registers a detailed configuration.Finally, papers gives the test results and test waveforms of MOSFET, cold-hot start, freewheeling circuit which is the key point in the start-up phase and steady state. The test results validate the rationality of the design.
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