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SOLID STATE LIGHTING CONTROL

  • US 20150035450A1
  • Filed: 07/24/2014
  • Published: 02/05/2015
  • Est. Priority Date: 08/01/2013
  • Status: Active Grant
First Claim
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1. Dimmer interface circuit for controlling brightness of a solid state light emission device, the interface circuit having an input to receive a brightness control voltage from a dimmer circuit and comprising:

  • a voltage converter to provide a converter output voltage and having an inductive component and a charge store, the charge store controllably coupled to receive charge from the inductive component to thereby convert the brightness control voltage to the converter output voltage; and

    control circuitry comprising;

    an input to receive a voltage level indication of the brightness control voltage;

    an input to receive a voltage level indication of the converter output voltage;

    a comparison circuit to compare a said received brightness control voltage level indication and a said received converter output voltage level indication; and

    a transition detector to detect a transition of the brightness control voltage, said transition for turning a said solid state light emission device on,wherein the control circuitry is configured to control the voltage converter dependent on a said comparison of said level indications received at a time of a said transition in a first cycle of the brightness control voltage, such that a difference between the brightness control voltage and the converter output voltage at a time of a said transition in a second, later said cycle is closer to a target voltage difference than a said difference at the time of the transition in the first cycle.

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