Simulation and Analysis of Power Factor Correction in Electric Control System for Metal Halide High Intensity Discharge Lamps

Metal Halide High Intensity Discharge lamps are becoming popular because of its high efficacy. The operating characteristic of Metal Halide High Intensity Discharge (HID) lamps is complex as it has several stage of operation. So electric control system is required to control the operation of metal halide high intensity discharge lamps. Electric control system involves a number of non linear devices which reduce the power factor. Therefore power factor correction circuit is essential to get better voltage regulation and increase capacity to serve power requirements. The objective of this paper is to design an active power factor correction circuit using boost converter. The circuit is based on the modification of boost converter using active devices. Adaptive switching frequency control technique is used to regulate the output voltage. In this technique two control loops are used, outer loop is voltage loop that senses the output voltage while inner loop is current loop that senses the inductor current. PI Controller is used to stabilize the performance of control loops. Not only the proposed circuit requires few components for its implementation but also size and cost can be effectively reduced. The capacitor and inductor with voltage and current ripple with minimum ripple values was designed and to absorb sinusoidal input current to reduce total harmonic distortion (THD) in the input current with output voltage regulation. PSIM simulation software is used to do this analysis.