Supply device of circuit branches with led diodes
AssigneeSTMicroelectronics S.r.l.
InventorsGianluca Ragonesi, Patrizia Milazzo, Salvatore Musumeci, Giuseppe Platania
Life of this patent
Estimating the term…
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 a first circuit branch that includes a first LED diode, said device comprising:
- a supply circuit configured to provide an electric supply of said at least two circuit branches, said supply circuit comprising a variable resistance;
- and
- a control circuit having an input coupled to said first circuit branch and structured to vary said variable resistance based on a current in said first circuit 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 supply circuit configured to provide an electric supply to the first circuit branch, the supply circuit including 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 and a first resistor;
- a variable resistance;
- a supply circuit configured to provide an electric supply to the first circuit branch, the supply circuit including a first error amplifier coupled to the variable resistance and 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 a first intermediate node of the first circuit branch, the first intermediate node being between the first LED diode and the first resistor and the control structure being structured to vary the variable resistance based on a first voltage detected at the first intermediate node.
Dependencies are inferred from the claim text.