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Solid State Lightening Driver with Mixed Control of Power Switch

  • US 20140055052A1
  • Filed: 01/23/2013
  • Published: 02/27/2014
  • Est. Priority Date: 08/24/2012
  • Status: Active Grant
First Claim
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1. A control unit for a driver circuit which is configured to drive a solid state lightening, referred to as SSL device, subject to an input voltage derived from a mains voltage using a phase-cut dimmer, wherein the driver circuit comprises a transistor operable in a first mode and in a second mode;

  • and a power converter network; and

    wherein the control unit is configured tocontrol the transistor to selectively operate in the first and second mode;

    wherein in the first mode, the transistor alternates between an on-state and an off-state at a commutation cycle rate, thereby providing a switched-mode power converter in conjunction with the power converter network;

    wherein in the second mode, the transistor is controlled so that it is traversed by a controlled current, thereby providing a controlled load to the mains voltage.

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