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LED DRIVER CIRCUIT AND LED DRIVING METHOD

  • US 20180014369A1
  • Filed: 06/19/2017
  • Published: 01/11/2018
  • Est. Priority Date: 07/07/2016
  • Status: Active Grant
First Claim
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1. A light emitting diode (LED) driver circuit, comprising:

  • a dimmer connected to an AC input;

    a rectifier circuit that is configured to receive the AC input from the dimmer, and to rectify the AC input to generate an input voltage;

    an LED string having a first end that is connected to the input voltage, the LED string comprising at least one LED element;

    an LED conducting state detection circuit configured to detect a conducting state of the LED string, and to generate a discharge control signal in response to sensing the LED string in a non-conducting state wherein an LED current does not flow to the LED string; and

    a current source that is connected to the first end of the LED string, the current source being configured to generate a discharge current according to the discharge control signal when the LED string is in the non-conducting state.

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