US 2010/0244727 A1 · LIGHT-EMITTING DIODE DRIVER

Abstract

A light-emitting diode (LED) driver used to power at least one LED with an alternating current (AC) voltage source is provided. The LED driver includes a rectifying unit applying N-fold higher voltage than the voltage from the AC voltage source to the LED. The rectifying unit includes a first charging unit to charge a first voltage, and a second charging unit to charge a second voltage. The first voltage includes the voltage at the AC voltage source during a first half-cycle of one AC voltage cycle, and the second voltage includes the first voltage and the voltage at the AC voltage source during the second half-cycle of the AC voltage cycle. Accordingly, the LED driver may improve light-emitting efficiency and reduce flicker of LEDs.

Claims11

Dependent claims

A light-emitting diode (LED) driver to power at least one LED, comprising:

a rectifying unit to apply a voltage from an alternating current (AC) voltage source to the at least one LED,
wherein the rectifying unit comprises:
a first charging unit to charge a first voltage;
and
a second charging unit to charge a second voltage,
wherein the first voltage comprises the voltage of the AC voltage source during a first half-cycle of one AC voltage cycle, and
the second voltage comprises the first voltage and the voltage of the AC voltage source during the second half-cycle of the AC voltage cycle.

4 more elements

Dependencies are inferred from the claim text.

Light-emitting diode driver

Life of this patent

Light-emitting diode driver

Life of this patent

Abstract

Claims11