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LED lighting systems and methods for constant current control in various operation modes

  • US 9,807,840 B2
  • Filed: 06/02/2015
  • Issued: 10/31/2017
  • Est. Priority Date: 11/15/2011
  • Status: Active Grant
First Claim
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1. A system for providing at least an output current to one or more light emitting diodes, the system comprising:

  • a control component configured to receive at least a demagnetization signal, a sensed signal and a reference signal and to generate a control signal based on at least information associated with the demagnetization signal, the sensed signal and the reference signal;

    a logic and driving component configured to receive at least the control signal and output a drive signal to a switch based on at least information associated with the control signal; and

    a demagnetization component configured to receive a feedback signal, directly or indirectly, from a first diode terminal of a diode and a first inductor terminal of an inductor, and to generate the demagnetization signal based on at least information associated with the feedback signal;

    wherein;

    the switch is connected to the first diode terminal and the first inductor terminal, the diode further including a second diode terminal, the inductor further including a second inductor terminal;

    the second diode terminal and the second inductor terminal are configured to provide at least the output current to the one or more light emitting diodes; and

    the control signal is configured to regulate the output current at a constant magnitude.

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