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Driver device and driving method for driving an LED unit

  • US 9,544,962 B2
  • Filed: 07/25/2012
  • Issued: 01/10/2017
  • Est. Priority Date: 08/01/2011
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • receiving at an input of a driver a periodic supply voltage from an external power supply,providing at an output of the driver at least one of a drive voltage and a drive current for driving a load,alternately operating the driver in one of a first mode and a second mode, including;

    in the first mode, controlling an input current received by the driver from the external power supply to draw a first power level from the external power supply, the first power level being greater than a power level required for driving the load, and supplying from the input current the at least one of the drive voltage and the drive current to the load, and further supplying electrical energy to charge an energy storage device; and

    in the second mode, controlling the input current received from the power input terminals to draw no more than a second power level from the external power supply, wherein the second power level is less than the power required for driving the load, and providing the at least one of the drive voltage and the drive current to the load from the energy storage device,wherein alternately operating the driver in one of the first mode and the second mode includes operating only in the first mode for a first set of half cycles of the periodic supply voltage, and operating only in the second mode for a second set of half cycles of the periodic supply voltage immediately subsequent to the first set of half cycles of the periodic supply voltage.

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