METHODS AND CIRCUITS FOR SUPPLYING A PULSED CURRENT TO LEDS
First Claim
1. A method of driving one or more than one light-emitting diodes with a pulsed current comprising:
- switching the pulsed current flowing through a loop comprising a direct current (DC) voltage, said light-emitting diodes, and an inductance means for charging the inductance means and supplying the pulsed current to the light-emitting diodes;
switching a current from the inductance means to the direct current (DC) voltage for discharging the inductance means;
wherein switching the pulsed current and switching the current are controlled to regulate the pulsed current supplied to said light-emitting diodes.
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Abstract
Methods and circuits for driving one or more than one light-emitting diodes with a pulsed current are disclosed.
Each of said circuits comprises: an inductance means; a switching unit for switching a current flowing through a loop comprising a direct current voltage, said light-emitting diodes and the inductance means and for either switching a current flowing from the inductance means to the direct current voltage or switching a current flowing from the direct current voltage to the inductance means; a switching control unit for controlling said switching to regulate the current of the inductance means for supplying the pulsed current to said light-emitting diodes.
Accordingly, the present invention provides a switching-mode pulsed current supply circuit for driving white light-emitting diodes that is able to provide higher perceived brightness levels and has much longer lifetime than existing light-emitting diode drivers.
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Citations
20 Claims
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1. A method of driving one or more than one light-emitting diodes with a pulsed current comprising:
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switching the pulsed current flowing through a loop comprising a direct current (DC) voltage, said light-emitting diodes, and an inductance means for charging the inductance means and supplying the pulsed current to the light-emitting diodes; switching a current from the inductance means to the direct current (DC) voltage for discharging the inductance means; wherein switching the pulsed current and switching the current are controlled to regulate the pulsed current supplied to said light-emitting diodes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of driving one or more than one light-emitting diodes with a pulsed current comprising the steps of:
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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 flowing through a loop comprising said light-emitting diodes, the inductance means and the direct current (DC) voltage for discharging the inductance means and supplying the pulsed current to the light-emitting diodes; wherein switching the current and switching the pulsed current are controlled to regulate the pulsed current supplied to said light-emitting diodes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. 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 switching unit comprising one or more switches for switching the pulsed current flowing through a loop comprising a direct current (DC) voltage, the inductance means and said light-emitting diodes, and for switching a current from the inductance means to the direct current (DC) voltage or switching a current from the direct current (DC) voltage to the inductance means; a switching control unit coupled to the switching unit to control the switches of the switching unit to regulate the pulsed current supplied to said light-emitting diodes. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification