Based On Pt Hid Lamps With High Frequency Resonant Transform System Research

As a energy-saving electric light source, High intensity discharge (referred as HID) lamp is used widely. HID lamp is a high luminous efficient electric light. It plays an important role in the lighting project. Electronic ballasts, which are used to match with the HID lamp, become the focal point and hot spots. Electronic ballast will gradually replace the magnetic ballast, because the electronic ballast has some advantages, such as low energy consumption, high efficiency and less work noise.In the design process of electronic ballast, the system simulation has some advantages, such as low cost, short development cycle and high work-efficiency. So the method of system simulation becomes the preferred way for the researchers. In this paper, the high frequency resonant transformation system of HID lamp based on PT is researched by system simulation method.In this thesis, we introduces the research results of the switch arc based on the gas discharge lamp model, and establishes a new dynamic conductance model of HID lamp based on the principle of electric arc. This model is simulated at low and high frequency individually in Simulink. Simulation results show that the model can simulate the external electrical characteristics of HID lamp. Meanwhile, because of the need of the simulation, we also built the model of HID lamp in PSPICE. On the basis of the previous studies, we design electronic ballast systems based on PT. This paper describes the overall design of the system and the design process of the key part of the circuit. The system uses the PT to construct the resonant converter and uses the phase-locked loop control according to the frequency characteristics of PT. Because the equivalent resistance of HID lamp changes during working, the current control circuit is introduced in the system in order to ensure that the lamp current is constant. The system feedback control includes the current control circuit and the phase-locked loop control. The system has been simulated in PSPICE. The simulation results show that the design of the system meet the voltage and rated power requirements of HID lamp. The theoretical analysis and simulation results prove the feasibility of the electronic ballast system design in this thesis.