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Discharge lamp ballast and projector

  • US 20070164687A1
  • Filed: 09/07/2004
  • Published: 07/19/2007
  • Est. Priority Date: 02/24/2004
  • Status: Active Grant
First Claim
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1. A discharge lamp ballast, comprising:

  • a power converter that includes at least one switching element and is connected between a power source and a high intensity discharge lamp; and

    a control circuit that controls an on/off state of the switching element so as to provide prescribed lamp power for the lamp based on lamp power control after the start of the lamp;

    wherein the control circuit controls the on/off state of the switching element so that at least one of an effective value and a peak value of the lamp power provided for the lamp is increased more than that adjusted by constant lamp power control based on high power control after the start of the lamp, said constant lamp power control being control for adjusting the effective value of the lamp power provided for the lamp to a prescribed power value.

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