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Operating circuit for light emitting diodes and method for operating light emitting diodes

  • US 9,544,955 B2
  • Filed: 12/18/2012
  • Issued: 01/10/2017
  • Est. Priority Date: 12/19/2011
  • Status: Active Grant
First Claim
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1. A method for operating at least one light-emitting diode (LED) (5, 6), the method comprising:

  • providing a switching regulator circuit (20), which is in the form of a buck converter and to which an input voltage (VDC) is supplied, and which provides, by at least one switch (1) which is clocked by a control unit (10), an output voltage (VOUT) for supplying current, voltage or electric power which is constantly regulated at least when averaged over time to the at least one light-emitting diode (5, 6), wherein the setpoint value for the LED current, voltage or power is adjustable for dimming; and

    varying control parameters of a control loop for the LED current, the LED voltage or the LED power depending on an operating mode of the switching regulator circuit (20) and wherein the adjustment of the control parameters is made dependent on the fact that, in a continuous operating mode of the switching regulator circuit, the steady-state gain (ks1, ks2) is greater than in a discontinuous operating mode.

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