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05/13/15 |
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Xenon short-arc lamps are used in laboratories to simulate sun light. The spectrum of these lamps is similar to the daylight. This High Intensity Discharge lamp needs a high- voltage igniter to create enough voltage to break down the gas and start the conduction. After the ignition stage, the high-voltage is not needed and a constant current can drive the lamp into its steady-state operation. For the HV ignition, we need a high frequency (HF) transformer and a HF converter. For the HF transformer, we used a TV transformer (from a discarded TV) which was suitable for this purpose. The HF converter and other part of the circuit are shown in the figure below. When the HV capacitor is charged, the HV air-gap breaks and a high voltage appears across the lamp. The air-gap separates the HV part from the LV part. A filter is used to prevent the HV pulses to reach the current source. After ignition, the HV part is mainly separated from the operational circuit and the lamp is supplied by the current source. The benefit of the proposed circuit is that the HV part will be separated from the LV part after completing the ignition stage. | |
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Structure of a Xenon short-arc lamp. |
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High-voltage igniter for Xenon short-arc lamp. |
This site was last updated 05/13/15
