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POWER SUPPLY DEVICE AND LIGHTING EQUIPMENT

  • US 20110057576A1
  • Filed: 09/01/2010
  • Published: 03/10/2011
  • Est. Priority Date: 03/24/2008
  • Status: Active Grant
First Claim
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1. A power supply device comprising:

  • a semiconductor light-emitting element;

    a current control circuit which controls a current supplied to the semiconductor light-emitting element;

    a voltage control circuit which controls a voltage applied to the semiconductor light-emitting element; and

    a dimming controller which receives a dimming signal having a certain dimming depth, sets a current control mode and/or a voltage control mode according to the dimming depth, controls the current control circuit to drive the semiconductor light-emitting element at a target current specified depending on the dimming depth when the current control mode is set, and controls the voltage control circuit to drive the semiconductor light-emitting element at a target voltage specified depending on the dimming depth when the voltage control mode is set.

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