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Design and Implementation of HID Lamp Supply Using Fly-Back Converter

G.Mohanambal, R.Yamini, S.Shanthi, S.Janani

The HID lamps are extensively more efficient at producing evident light for a given amount of electrical power than fluorescent or incandescent bulbs. The HID lamps are used, when high levels of brightness and energy efficiency are required. Electronic ballast for driving high intensity discharge (HID) lamps consisting of fly back converter is used in this work. In fly back converters dc supply is switched at very high frequency and inductively transferred to dc load via a high frequency transformer and rectifier. This concept is utilized in this work to charge and discharge two capacitors alternatively using two power switches connected to primary and secondary of a high frequency transformer. In adding EMI filter (Electromagnetic Interference Filter) can be additional to prevent the intrusion of generated high frequency with 50Hz supply. Pf, Power and effectiveness calculations are also performed. Closed loop PID control is also provided to attain the preferred output voltage .A prototype consisting of a sensing circuit fully referenced to the switches general ground is explained in detail. Design conformity, experimental and simulation results from Matlab and CCS are presented, as well as deliberations about the converter possibility are done