Hid Lamp Ballast Circuit
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The buck stage is necessary to step down the constant dc bus voltage from the boost stage to the lower.
Hid lamp ballast circuit. The optional capacitor is used for power factor correction only and does not affect the ballast or lamp operation. The duty cycle d is established by a constant current control circuit. A familiar and widely used example is the inductive ballast used in fluorescent lamps to limit the current through the tube which would otherwise rise to a destructive level due to the negative differential resistance of the tube s voltage current characteristic. Hid lamps have negative impedance which means that the lamp draws more current than is required for it to operate.
What is hid ballast. This circuit must limit the lamp current to a safe maximum value to prevent its destruction. The capacitor when added will reduce the ballast input current while the hid lamp is operating. Hid lamps like fluorescent lamps require a ballast to provide the proper starting voltage for the lamp and limit the operating current once the lamp is ignited.
250 w hid lamp ballast block diagram to generate a square wave current in the lamp the circuit is driven in the following way. Ballast circuitry lamp ballast regulation characteristics one of the most important characteristics of each particular ballast circuit is the degree to which it controls the lamp wattage and hence light output with changes of input line voltage. A hid ballast hid stands for high intensity discharge is a device that is used to control the voltage and arc current of high intensity discharge lamps during their operation. Capacitors are optional for reactor r and high reactance hx ballast circuit designs.
Hid lamps have found their way into lighting for ceiling streets airports stadiums and even automotive headlights. High pressure sodium ballast wiring diagram a beginner s overview of circuit diagrams. A when low side device l2 is switched on the high side power mosfet h1 operates with a high frequency pulse width modulation pwm. An electrical ballast is a device placed in series with a load to limit the amount of current in an electrical circuit.
The ballast s main control circuit the buck control circuit controls the lamp current. Hid lamps need a circuit to control the current flowing through them often called a ballast. Tell us if something is incorrect. A very first appearance at a circuit diagram could be confusing however if you could review a subway map you can check out schematics.
Ballast circuit design dictates the lamp wattage regulation characteristics.
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