hid electronic ballast circuit diagram

Published:2014/3/2 21:29:00 Author:lynne | Keyword: hid electronic ballast circuit diagram, IR2112 | From:SeekIC

Using PM4020H design (HID) or high-pressure sodium lamp electronic ballast :Using high current push-pull circuit , can drive half-bridge and full- bridge circuit. Bridge output using low frequency AC , PM4020H single -ended drive built-in crossover frequency to 195Hz low frequency , thus eliminating the acoustic resonancePM4020H controllerHPM4020H control and drive HIDL integrates all the functions needed, it is suitable for metal halide ( such as car headlights, projector lamps, etc. ) , high-pressure mercury lamp and high pressure sodium high intensity discharge lamp controller driver and control. It contains a complete current mode pulse width modulator, a lamp power regulator, lamp temperature compensator and all fault protection.HPM4020H structure and function shown in Figure 1 . Using high current push-pull circuit , can drive half-bridge and full- bridge circuit. Bridge output using low frequency AC , PM4020H single -ended drive built-in crossover frequency to 195Hz low frequency , thus eliminating acoustic resonance . The discharge arc is unstable acoustic resonance phenomenon occurs when a high-frequency HIDL supply mechanism is pulsating pressure wave in the lamp is reflected from the inner wall of the tube , if the phase of the pulsed high-frequency current component is the same , the formation of standing waves generating acoustic resonance , ranging from light shake , heavy burning lamps and ballasts.As shown in Figure 1 shows the structure and function of HPM4020H: Output of the controller uses a full-bridge inverter. The inverter operates at the frequency 195Hz, the average lamp voltage is zero. Bridge is driven by foot QOUT and QOUT output, they are 50% duty cycle, a difference of 180 °. Using IR2112 driver high and low of the MOSFET. The cost of this approach is expensive, can directly drive the low-end and high-end using a high-voltage transistor, a resistor and pull the correct phase. The following is a detailed circuit diagram.



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