Switching mode pulsed current supply for driving LEDS
OwnerWen-Hsiung Hsiehinventor
Life of this patent
Estimating the term…
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
A method of supplying a pulsed current to one or more than one light-emitting diodes comprising:
- switching a first 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 discharging the inductance means to said light-emitting diodes;
- switching a second current from the inductance means to the direct current (DC) voltage for discharging the inductance means to the direct current (DC) voltage;
- wherein switching the first current from the direct current (DC) voltage to the inductance means, switching the pulsed current from the inductance means to said light-emitting diodes, and switching the second current from the inductance means to the direct current (DC) voltage are controlled to regulate the pulsed current.
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 first 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 second 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 the first switching unit, the second switching unit and the third switching unit to control their switching for regulating the pulsed current supplied to said light-emitting diodes.
Dependencies are inferred from the claim text.