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High voltage discharge lamp apparatus for vehicles

  • US 6,392,364 B1
  • Filed: 06/19/2000
  • Issued: 05/21/2002
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Term
First Claim
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1. A discharge lamp apparatus having a DC power source and a discharge lamp comprising:

  • a transformer for boosting a voltage of the power source;

    a switching element connected to a primary side of the transformer; and

    power control means for duty-controlling the switching element based on a signal indicating a lighting state of the discharge lamp to thereby control the power supplied to the discharge lamp, wherein the power control means is provided with power reduction means for reducing the power supplied to the discharge lamp as a temperature increases;

    the power reduction means has a plurality of diodes connected in series; and

    the power control means controls the power supplied to the discharge lamp based on the temperature characteristic of the diodes.

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