Metal Halide Lamp Ballast

High intensity discharge lamp(the initials HID) is a highly efficient,energy-saving lightsource.It has high-efficiency,longlife and other significant advantages How- ever,the traditional inductance ballast has been unable to meet the electricity demand of green lighting because of it needs to spend a lot of copper, iron and other metal materials and low work efficiency. This paper targeted at high pressure sodium lamp, proposed a HID electronic ballast design,and conduct a more in-depth theoretical analysis and experimental study. This paper mainly do the following work:(1) The electronic ballasts APFC technical studies. On the APFC technology the basic idea, in theory and a detailed analysis of the potential use of intermittent mode, indefinite frequency, the peak current control of the APFC boost for the realization of changes in principle. Summed up the use of power factor correction L6561 chip design PFC's basic steps and methods;(2) PWM DC-DC power-control circuit research. On the PWM DC-DC-circuit the working principle of PWM DC-DC buck-circuit in the calculation of key parameters derived formula, and adopted by the derivation of the experimental verification of the correctness of the formula;(3) Inverter research. The electronic ballast inverter circuit electronic ballast circuit is the most crucial part. This paper was designed based on a full-bridge controller UBA2032 control of the full-bridge inverter circuit;(4) Study on the ignition start. This article is based on LC series resonance of the start-up approach to a more in-depth theoretical analysis and experimental study. Proposed a new programme launched pulse transformer. And the start-up mode compared to other, the paper referred to the programme this circuit structure is simple, high reliability and power requirements applicable to a variety of high-pressure sodium lamp;(5) Protection circuit research. In this paper, the temperature protection circuit design and overcurrent protection circuits, can effectively protect Halide Lamp electronic ballasts.The results show that such electronic ballasts with continuous exchange of input current power grid, the power factor of about 0.99, the total harmonic distortion of less than 10 percent.