SWITCHING MODE PULSED CURRENT SUPPLY FOR DRIVING LEDS
First Claim
1. 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.
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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.
5 Citations
16 Claims
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1. A method of supplying a pulsed current to one or more than one light-emitting diodes comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A circuit for supplying a pulsed current to one or more than one light-emitting diodes, said circuit comprising:
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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. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification