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Systems and methods for regulating LED currents

  • US 10,299,322 B2
  • Filed: 01/06/2012
  • Issued: 05/21/2019
  • Est. Priority Date: 12/08/2011
  • Status: Active Grant
First Claim
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1. A system for regulating one or more currents, the system comprising:

  • a system controller including a first controller terminal, a second controller terminal, and a ground terminal, the system controller being configured to output a drive signal at the first controller terminal;

    an inductor including a first inductor terminal and a second inductor terminal, the first inductor terminal being coupled to the ground terminal, the second inductor terminal being directly coupled to one or more light emitting diodes;

    a first resistor including a first resistor terminal and a second resistor terminal, the first resistor terminal being directly coupled to the first inductor terminal;

    a switch configured to receive the drive signal and coupled to the second resistor terminal; and

    a first diode including a first diode terminal and a second diode terminal and directly coupled to the first resistor, the second diode terminal being coupled to the one or more light emitting diodes;

    wherein;

    the second controller terminal is coupled indirectly to the switch through at least a second resistor, coupled indirectly to the second inductor terminal through at least a Zener diode and a second diode, and coupled indirectly to the ground terminal through at least a capacitor; and

    the Zener diode includes a first Zener terminal and a second Zener terminal, the first Zener terminal directly coupled to the second controller terminal, and the second Zener terminal directly coupled to the second diode.

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