Study On Electronic Ballasting Techniques For Medium And Small Power High Intensity Discharge Lamp

High Intensity Discharge (HID) lamp, with high efficiency and good color rendering and long life, is a green lighting source.It has been an important part of Green Lighting Engineering.The performance and price of the electronic ballast are the two important factors to hinder the popularization of HID lamp.Therefore, the research on low-cost and high-performance of the electronic ballast is necessary and valuable.This paper introduces the principles and the electrical characteristic of HID lamp in brief. Based on the demand to electronic ballast, the basic circuit of HID lamp electronic ballast is analyzed, and the drive circuit and the control power supply circuit are designed.Two topological stages of HID lamp electronic ballast are adopted in this paper, the first stage is the active power factor correction (APFC) circuit, and the second stage is the inverter circuit.Pulse width modulations are both used in the first control circuit and the second control circuit. A prototype of385V/100W Critical Conduction Mode (CRM) APFC Boost converter is designed, and the simulation and experimental results are satisfied with the request. The harmonic characteristics of CRM with peak current control are analyzed, and then the resonant parametric perturbation method is proposed. The simulation result shows the method is feasible.The mechanism of the acoustic resonance phenomena of the HID lamps is analyzed, and the techniques for suppressing acoustic resonance are also introduced. A kind of the circuit is designed for suppressing acoustic resonance.The simulation and experimental results show that the harmonic frequencies of PWM signal are spread and the amplitude of specific frequencies are decreased.The simulation and experimental results show that the resonant parametric perturbation method used in APFC circuit can increase the power factor, and the spectrum spread technique used in the inverter circuit can suppress the acoustic resonance. The above two methods are useful to achieve HID lamp electronic ballast with low-cost and high-performance.