Supply device of circuit branches with LED diodes
AssigneeSTMicroelectronics S.r.l.
InventorsGianluca Ragonesi, Patrizia Milazzo, Salvatore Musumeci, Giuseppe Platania
Life of this patent
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Abstract
A device includes at least two circuit branches, each of said at least two circuit branches comprising at least one LED diode. The device comprises a supply circuit that provides an electric supply of said at least two circuit branches and includes a variable resistance. The device comprises a controller coupled to said at least two circuit branches and suitable for varying said resistance in reply to a variation of the current that flows in one of said at least two circuit branches to vary the electric supply of said at least two circuit branches.
Claims26
A supply device for supplying at least two circuit branches, each of said at least two circuit branches including at least one LED diode, said device comprising:
- means for providing an electric supply of said at least two circuit branches, said means comprising a variable resistance;
- and
- control means, coupled to said at least two circuit branches, for varying said resistance in reply to a variation of a current that flows in one of said at least two circuit branches to change the electric supply of said at least two circuit branches.
A lighting circuit, comprising:
- a first circuit branch that includes a first LED diode;
- a supply circuit that provides an electric supply to the first circuit branch, the supply circuit including a resistive divider with a variable resistance;
- and
- a control circuit having an input coupled to the first circuit branch and structured to vary the variable resistance based on a current in the first branch and vary the electric supply based on the varying of the variable resistance.
A lighting circuit, comprising:
- a first circuit branch that includes a first LED diode;
- a variable resistance;
- a supply circuit that provides an electric supply to the first circuit branch, the supply circuit including a first error amplifier coupled to the variable resistances structured to change the electric supply provided to the first circuit branch in response to a change in the variable resistance;
- and
- a control circuit having an input coupled to the first circuit branch and structured to vary the variable resistance based on a current in the first branch.
Dependencies are inferred from the claim text.