The Optimization Design Of Electronic Ballast Circuit Parameters

Energy conservation has become the universal concern in the industrial development in our country and the world. With high luminous efficiency and good color and long life of the third-generation green lighting, high intensity discharge (HID) lamps have become an important part in the green lighting applications. Because of the negative resistance characteristics of HID lamps, it needs to be used with the electronic ballast. The performance and cost of electronic ballast is becoming a hot topic problem in application researches.The operating principle, electrical characteristics and the basic topology of HID lightings are introduced in this paper. Based on analysis of the basic circuit of electronic ballast and the requirements of HID lamp, EMI filter circuit rectifier circuit, starting circuit and the auxiliary DC power supply circuit for a typical electronic ballast are designed.To solve the optimized parameters problem on the electronic ballast and suppress unique acoustic resonance phenomenon in HID lamps, a two-stage topologies HID lamp electronic ballast is proposed, in which active power factor correction (APFC) Boost circuit and bridge inverter circuit use PWM control technology. The relationship between the input current harmonics and power factor for the electronic ballast designed circuit are analyzed. Saber and Matlab software package are used to optimize the design parameters by a control strategy for APFC technology, which is based on the parameter perturbation optimization to reduce the harmonics and improve the power factor.Production condition for the acoustic resonance and the parameter perturbation frequency modulation spectrum dispersion principle are investigated. By using a ripple voltage in the previous stage input, dispersed spectrum suppression circuit is developed. Based on the driver chip of SG3525and L6562, a critical conduction mode of250W HID lamp electronic ballast is designed. The simulation analysis and experimental testing on the proposed circuits are realized.The test results show that the parameter perturbation optimization can improve power factor effectively, and reduce the input current total harmonic distortion. The spectrum using parameter perturbation combined frequency modulation dispersed circuit to avoid output stage HID lights drive forming a standing wave signal at a fixed frequency point, and effective inhibition of the generation of the acoustic resonator. The design of HID lamp electronic ballasts in this paper works stability and has a power factor above0.98and more than90%inefficiency.