The invention relates to a driver circuit for light sources, in particular LEDs, comprising a selection circuit, comprising at least one selection circuit element defined by an electric quantity having one of a plurality of pre-established electric quantity levels, and an electronic control unit (EC
The invention relates to a driver circuit for light sources, in particular LEDs, comprising a selection circuit, comprising at least one selection circuit element defined by an electric quantity having one of a plurality of pre-established electric quantity levels, and an electronic control unit (ECU), comprising a reference circuit, suitable for providing a reference electric quantity, and a regulation circuit of the driver current, suitable for establishing a driver current of the light sources on the basis of said reference electric quantity.
대표청구항▼
1. A driver circuit of light sources, in particular LEDs, comprising: a selection circuit including a resistive selection element having a terminal connected to the power supply voltage and having an electric resistor level corresponding to a short-circuit, an open circuit or a medium impedance;an e
1. A driver circuit of light sources, in particular LEDs, comprising: a selection circuit including a resistive selection element having a terminal connected to the power supply voltage and having an electric resistor level corresponding to a short-circuit, an open circuit or a medium impedance;an electronic control unit (ECU) including a reference circuit that provides a reference electric quantity, and a regulation circuit of the driver current that establishes a driver current of the light sources on the basis of said reference electric quantity, said reference circuit includes:a levels acquisition circuit that acquires at least one electric selection signal associated with the electric resistor level of the resistive selection element and provides selection information relative to said level of electric resistance; anda levels definition circuit that receives said selection information and provides, in response to said selection information, the reference electric quantity from a plurality of predefined levels of electric reference quantity,wherein said levels acquisition circuit includes two level acquisition transistors, the on or off state of which depends on the resistor level of the selection resistor element, and two current-controlled output switches, each controlled by a respective level acquisition transistor and having an output terminal connected to the levels definition circuit. 2. The circuit as set forth in claim 1, wherein each output terminal can be connected to ground or is suitable to assume a high impedance level. 3. The circuit as set forth in to claim 1, wherein said levels acquisition circuit is connected between the power supply voltage and the ground and includes a first level acquisition transistor having the base connected to the selection circuit, the emitter connected, by a voltage divider, to the base of a second transistor, defining an output switch, the emitter of which is connected to ground and the collector of which represents an output terminal of the levels acquisition circuit the collector of the first transistor being connected, by a resistive divider, to the base of a third level acquisition transistor, the emitter of which is connected to the power supply voltage and the collector of which is connected, by a voltage divider, to the base of a fourth transistor, defining the second output switch, the emitter of said fourth transistor being connected to the ground, the collector of said fourth transistor being the second output terminal of the levels acquisition circuit. 4. The circuit as set forth in claim 1, wherein said reference electric quantity is a reference voltage (Vref). 5. The circuit as set forth in claim 4, wherein the levels definition circuit includes an operational amplifier circuit, where said operational amplifier has an input terminal connected to the output terminal of a generator circuit of a regulated constant voltage, an output terminal which the reference voltage is present on, and a gain depending on the level of said selection information. 6. The circuit as set forth in claim 5, wherein each output terminal of the levels acquisition circuit is connected to an input resistance connected to the inverting input of said operational amplifier. 7. The circuit as set forth in claim 1, wherein the electronic control unit is placed on a control circuit board, and wherein the light sources and the selection circuit are placed on a lighting terminal strip separate from the circuit board. 8. The circuit as set forth in claim 1, wherein each level of resistance of the selection resistor is associated with a luminous flow level generated by light sources belonging to a lot of light sources, when powered with nominal voltage and/or current values. 9. An electronic control circuit board of light sources comprising: an electronic control unit (ECU) including a reference circuit that provides a reference electric quantity, and a regulation circuit of the driver current that determines a driver current of the light sources on the basis of said reference electric quantity;wherein said reference circuit further includes a levels acquisition circuit that acquires at least one electric selection signal and provides selection information relative to said level of electric quantity and a levels definition circuit that receives said selection information and provides, in response to said selection information, the reference electric quantity from a plurality of predefined levels of electric reference quantity; andwherein said levels acquisition circuit further includes two level acquisition transistors, the on or off state of which depends on the level of said electric selection signal, and two current-controlled output switches, each controlled by a respective level acquisition transistor and having an output terminal connected to the levels definition circuit. 10. The circuit board as set forth in claim 9, wherein said levels acquisition circuit has a number of output terminals depending on the number of levels which said electric selection signal may assume, each output terminal being connectable to ground or being suitable for assuming a level of high impedance depending on the level of the electric selection signal in input to the levels acquisition circuit. 11. The circuit board as set forth in claim 10, wherein said levels acquisition circuit is a transistor circuit connected between the power supply voltage and the ground and comprising a first level acquisition transistor having the base connected to the selection circuit, the emitter connected, by a voltage divider, to the base of a second transistor, defining an output switch, the emitter of which is connected to ground and the collector of which represents an output terminal of the levels acquisition circuit the collector of the first transistor being connected, by a resistive divider, to the base of a third level acquisition transistor, the emitter of which is connected to the power supply voltage and the collector of which is connected, by a voltage divider, to the base of a fourth transistor, defining the second output switch, the emitter of said fourth transistor being connected to the ground, the collector of said fourth transistor being the second output terminal of the levels acquisition circuit. 12. The electronic control circuit board as set forth in claim 9, wherein the reference electric quantity is a reference voltage (Vref) and wherein the levels definition circuit includes an operational amplifier circuit, where said operational amplifier has an input terminal connected to the output terminal of a generator circuit of a regulated constant voltage, an output terminal which the reference voltage is present on, and a gain depending on the level of said selection information. 13. The circuit board as set forth in to claim 12, wherein each output terminal of the levels acquisition circuit is connected to an input resistance connected to the inverting input of said operational amplifier. 14. A driver method of light sources, in particular LED, by an electronic control unit (ECU) that includes a reference circuit that provides a reference electric quantity, and a regulation circuit of the driver current that determines a driver current of the light sources on the basis of said reference electric quantity, said driver method comprising the steps of: associating at least one selection circuit element to the light sources defined by an electric quantity having one of a plurality of pre-established electric quantity levels;acquiring at least one electric selection signal associated with the level of said electric quantity of the selection circuit element and providing selection information relative to said level of electric quantity; andreceiving said selection information and providing the reference electric quantity from a plurality of predefined levels of electric reference quantity in response to said selection information. 15. The method as set forth in claim 14, wherein said reference circuit generates a plurality of control signals the combination of which permits a plurality of states to be obtained corresponding to the plurality of levels which the selection electric quantity may assume. 16. The method as set forth in claim 15, wherein said plurality of control signals is used to obtain a corresponding plurality of gain levels of an operational amplifier having an input connected to a regulated voltage, a plurality of different reference voltage levels being obtainable from said operational amplifier depending on said plurality of gain levels.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (5)
Maeda Mitsunori,JPX ; Muneyasu Kazuki,JPX ; Tomura Masashi,JPX ; Kubo Hiroshi,JPX ; Okumura Naoyuki,JPX ; Murakami Yujiro,JPX ; Hanawa Tetsuya,JPX ; Wakayama Shinichi,JPX, Charger for portable terminal equipment having on-hook/off-hook detecting means and battery identifying means.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.