LIGHTING CIRCUIT, IN PARTICULAR WITH LED LIGHT SOURCES
First Claim
1. A lighting circuit, in particular for a motor vehicle light, comprising:
- at least one light source defined by a first voltage selection and susceptible to being driven by a first driving current;
a first selection circuit to identify said first voltage selection;
at least one light source defined by a second voltage selection and susceptible to being driven by a second driving current;
a second selection circuit to identify said second voltage selection; and
an electronic control unit configured to detect said first and second voltage selection of the light source by said first and second selection circuit, and to regulate the driving current absorbed by the light source defined by the lower voltage selection, so that said driving current follows with a constant ratio the trend of the driving current absorbed by the light source defined by the higher voltage selection, the latter being taken as reference.
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Accused Products
Abstract
A lighting circuit, in particular for a motor vehicle light, comprises at least one light source, particularly of the LED type, defined by a first voltage selection, a first selection circuit to identify said first voltage selection, at least one light source, particularly of the LED type, defined by a second voltage selection, and a second selection circuit to identify said second voltage selection. An electronic control unit configured to detect said first and second voltage selection of the light source, and to regulate the driving current absorbed by the light source defined by the lower voltage selection, so that said driving current follows with a constant ratio the trend of the driving current absorbed by the light source defined by the higher voltage selection, the latter being taken as reference.
13 Citations
23 Claims
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1. A lighting circuit, in particular for a motor vehicle light, comprising:
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at least one light source defined by a first voltage selection and susceptible to being driven by a first driving current; a first selection circuit to identify said first voltage selection; at least one light source defined by a second voltage selection and susceptible to being driven by a second driving current; a second selection circuit to identify said second voltage selection; and an electronic control unit configured to detect said first and second voltage selection of the light source by said first and second selection circuit, and to regulate the driving current absorbed by the light source defined by the lower voltage selection, so that said driving current follows with a constant ratio the trend of the driving current absorbed by the light source defined by the higher voltage selection, the latter being taken as reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
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12. A lighting circuit as set forth in claim 12, wherein said current driver includes an integrated electronic device suitable for generating a driving current on the basis of a internal reference electric quantity, and wherein an input of said integrated electronic device is connected to the output terminal of the respective circuit regulator, a control switch suitable for being commanded by the comparator circuit to disable said circuit regulator being connected to said output terminal.
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14. An electronic control circuit board of light sources, where said light sources are mounted on at least two separate electronic lighting circuit boards, one of which being suitable for being implemented with the electronic control circuit board, wherein the light sources mounted on a first circuit board have a first voltage selection different from a second voltage selection of the light sources mounted on a second circuit board, comprising:
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a comparison circuit, including a circuit suitable for comparing selection electrical quantities, representative of the different voltage selections of the light sources, so as to identify, on the basis of the result of such comparison, the circuit board having the lighting sources with the higher voltage selection; and a regulation circuit including, for each of the electronic lighting circuit boards, a circuit regulator having input terminals which electric signals representative of the driving currents of the light sources of the lighting circuit boards are carried on, said circuit regulator being suitable for controlling respective lighting circuit boards in such a way that the driving current of one lighting circuit board is in a constant ratio with the driving current of another lighting circuit board, taken as reference, wherein said comparator circuit has output terminals, each connected to a respective regulator and to a respective current driver of the light sources in such a way that, depending on the level of the control signal present on said output terminals, said circuit regulators are enabled or disabled to control the respective lighting circuit board, the level of the control signal which disables the circuit regulators being suitable for controlling the respective current driver in such a way that they supply a reference driving current independent of the driving currents of the other lighting circuit boards. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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21. A driver method of light sources, particularly of the LED type, where said light sources include at least a first light source defined by a first voltage selection and susceptible to being driven by a first driving current, and at least a second light source defined by a second voltage selection and susceptible to being driven by a second driving current, the method comprising the steps of:
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detecting said voltage sections of the light sources; identifying the highest voltage selection; and regulating the driving current of the other light source so that said driving current follows with a constant ratio the trend of the driving current absorbed by the light source defined by the higher voltage selection, the latter being taken as reference. - View Dependent Claims (22)
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23. (canceled)
Specification