US 2013/0076257 A1 · SWITCHING MODE PULSED CURRENT SUPPLY FOR DRIVING LEDS

Abstract

A method of switching a plurality of switches for supplying a pulsed current to one or more than one light-emitting diodes involves: switching a current from a direct current (DC) voltage to an inductance component, for example an inductor or a flyback transformer, for charging the inductance component; switching a current from the inductance component to the light-emitting diodes for transferring energy from the inductance component to the light-emitting diodes; switching a current from the inductance component to the direct current (DC) voltage for transferring energy from the inductance means back to the direct current (DC) voltage; controlling the switchings to regulate the current in the inductance component for supplying the pulsed current to the light-emitting diodes is disclosed.

Claims16

Dependent claims

A method of supplying a pulsed current to one or more than one light-emitting diodes comprising:

switching a current from a direct current (DC) voltage to an inductance means for charging the inductance means;
switching the pulsed current from the inductance means to said light-emitting diodes for transferring energy stored in the inductance means to said light-emitting diodes;
switching a current from the inductance means to the direct current (DC) voltage for transferring energy stored in the inductance means back to the direct current (DC) voltage;
wherein the pulsed current is regulated by said switchings for charging the inductance means, for transferring energy stored in the inductance means to said light-emitting diodes, and for transferring energy stored in the inductance means back to the direct current (DC) voltage.

1 more element

A circuit for supplying a pulsed current to one or more than one light-emitting diodes, said circuit comprising:

an inductance means;
a first switching unit comprising at least one switch and coupled to the inductance means for switching a current from a direct current (DC) voltage to the inductance means for charging the inductance means;
a second switching unit comprising at least one switch and coupled to said light-emitting diodes for switching the pulsed current from the inductance means to said light-emitting diodes;
a third switching unit comprising at least one switch and coupled between the inductance means and the direct current (DC) voltage for switching a current from the inductance means to the direct current (DC) voltage for discharging the inductance means to the direct current (DC) voltage;
a switching control unit coupled to said switching units to control their switching to regulate the pulsed current supplied to said light-emitting diodes.

2 more elements

Dependencies are inferred from the claim text.

Switching mode pulsed current supply for driving leds

Life of this patent

Switching mode pulsed current supply for driving leds

Life of this patent

Abstract

Claims16