LED driver circuit with a boosted voltage output
OwnerEugene Robert Worley, Sr., Eugene Robert Worley, Jr.inventors
Life of this patent
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Abstract
A Light Emitting Diode (LED) driver circuit with a boosted voltage output for driving an LED from a voltage power supply having a voltage that is lower than the turn “on” voltage of the LED is provided. A charge pump provides the boosted voltage output of the LED driver circuit. During operation, the LED driver circuit switches the LED on and off at a predetermined frequency such that a human observer perceives the LED to be continuously turned “on”. In one embodiment, the LED driver circuit further comprises a current regulator for regulating the current supplied to the LED. In another embodiment, the LED driver circuit comprises a voltage regulator to regulate the boosted voltage output of the LED driver circuit.
Claims18
A Light Emitting Diode (LED) driver circuit, comprising:
- a charge pump having a voltage supply input and an output, said voltage supply input being connected to a voltage power supply and said output being connected to an LED;
- and
- an input buffer having an input and an output, said output of the input buffer being connected to the charge pump, wherein the input buffer either enables or disables the charge pump based upon a control logic signal received at its input;
- wherein the charge pump boosts the voltage of the voltage power supply at its output and the charge pump switches the LED on and off at a predetermined frequency.
A Light Emitting Diode (LED) driver, comprising:
- a diode having an anode and a cathode, the anode of said diode being connected to a voltage power supply;
- a capacitor having a low electrode and a high electrode, said high electrode being connected to the cathode of the diode and the anode of an LED;
- and
- an oscillator for driving the low electrode of the capacitor between a high voltage and a low voltage at a predetermined frequency.
Dependencies are inferred from the claim text.