Illumination device and illumination system

1. A lighting device comprising:

at least one optoelectronic semiconductor chip;

two contacts configured to couple the lighting device to a DC voltage;

a driver circuit interconnected in series with the at least one optoelectronic semiconductor chip in a string;

a converter circuit with a supply output;

a microcontroller being a control unit,

wherein the driver circuit comprises a monolithic, unhoused controller,

wherein the driver circuit is configured to adjust a current for operating the at least one optoelectronic semiconductor chip,

wherein the string extends between the two contacts in an electrically coupling way, and

wherein the converter circuit is a buck converter, is electrically coupled to the two contacts, is configured to provide a supply voltage via the supply output and is electrically coupled to the control unit via the supply output; and

a carrier which is a ceramic substrate,

wherein the driver circuit and the at least one optoelectronic semiconductor chip are arranged on the carrier,

wherein the carrier is a heat sink, and

wherein the at least one optoelectronic semiconductor chip is thermally coupled to the carrier.

2. The lighting device according to claim 1 , wherein the at least one optoelectronic semiconductor chip is an at least one unhoused optoelectronic semiconductor chip.

3. The lighting device according to claim 2 , further comprising

a plurality of optoelectronic semiconductor chips,

wherein the carrier with the optoelectronic semiconductor chips forms a chip-on-board (COB)-module.

4. The lighting device according to claim 1 , wherein the driver circuit comprises, externally to the controller, a resistor, and wherein the resistor is configured to adjust the current for operating the at least one optoelectronic semiconductor chip.

5. The lighting device according to claim 4 , wherein the controller has a ground connection and a reference voltage connection, between which the resistor is connected.

6. The lighting device according to claim 4 , wherein the resistor is formed light-sensitively such that its resistance value changes as a function of a luminous flux.

7. The lighting device according to claim 1 ,

wherein the controller has a control input,

wherein the control unit is signal-technically coupled to the control input, and

wherein the control unit is configured to control a radiation-emitting operating of the at least one optoelectronic semiconductor chip.

8. The lighting device as claimed in claim 1 ,

wherein the converter circuit has an excitation input,

wherein the control unit is signal-technically coupled to the excitation input, and

wherein the control unit is configured to provide an excitation signal for exciting a switching frequency of the converter circuit.

9. The lighting device according to claim 1 ,

wherein the driver circuit is configured to operate with a predetermined operating voltage,

wherein the driver circuit is arranged between a first portion of the string and a second portion of the string, and

wherein a number of optoelectronic semiconductor chips arranged in the second portion of the string is selected depending on the DC voltage, the predetermined operating voltage of the driver circuit, and a predetermined operating voltage of the optoelectronic semiconductor chips in the second portion.

10. A lighting system comprising:

at least one lighting device according to claim 1 ; and

a DC voltage source electrically coupled to the two contacts of the at least one lighting device,

wherein the DC voltage source is configured to provide the DC voltage for operating the lighting device.

11. A lighting system comprising:

at least five lighting devices according to claim 1 .

12. A lighting device comprising:

at least one optoelectronic semiconductor chip;

two contacts configured to couple the lighting device to a DC voltage; and

a driver circuit interconnected in series with the at least one optoelectronic semiconductor chip in a string,

wherein the driver circuit comprises a monolithic, unhoused controller,

wherein the driver circuit is configured to adjust a current for operating the at least one optoelectronic semiconductor chip,

wherein the string extends between the two contacts in an electrically coupling way,

wherein the driver circuit comprises, externally to the controller, a resistor, and wherein the resistor is configured to adjust the current for operating the at least one optoelectronic semiconductor chip, and

wherein the resistor is formed light-sensitively such that its resistance value changes as a function of a luminous flux.

13. The lighting device according to claim 12 , wherein the driver circuit and the at least one optoelectronic semiconductor chip are arranged on a common carrier.

14. The lighting device according to claim 12 , wherein the at least one optoelectronic semiconductor chip is an at least one unhoused optoelectronic semiconductor chip.

15. The lighting device according to claim 14 , further comprising:

a carrier; and

a plurality of optoelectronic semiconductor chips,

wherein the carrier with the optoelectronic semiconductor chips forms a chip-on-board (COB)-module.

16. The lighting device according to claim 12 ,

wherein the driver circuit is configured to operate with a predetermined operating voltage,

wherein the driver circuit is arranged between a first portion of the string and a second portion of the string, and

wherein a number of optoelectronic semiconductor chips arranged in the second portion of the string is selected depending on the DC voltage, the predetermined operating voltage of the driver circuit, and a predetermined operating voltage of the optoelectronic semiconductor chips in the second portion.

17. A lighting system comprising:

at least one lighting device according to claim 12 ; and

a DC voltage source electrically coupled to the two contacts of the at least one lighting device,

wherein the DC voltage source is configured to provide the DC voltage for operating the lighting device.

18. A lighting device comprising:

at least one optoelectronic semiconductor chip;

two contacts configured to couple the lighting device to a DC voltage;

a driver circuit interconnected in series with the at least one optoelectronic semiconductor chip in a string;

a converter circuit with a supply output;

a microcontroller being a control unit,

wherein the driver circuit comprises a monolithic, unhoused controller,

wherein the driver circuit is configured to adjust a current for operating the at least one optoelectronic semiconductor chip,

wherein the string extends between the two contacts in an electrically coupling way,

wherein the converter circuit is a buck converter, is electrically coupled to the two contacts, is configured to provide a supply voltage via the supply output and is electrically coupled to the control unit via the supply output,

wherein the driver circuit comprises, externally to the controller, a resistor,

wherein the resistor is configured to adjust the current for operating the at least one optoelectronic semiconductor chip, and

wherein the resistor is a light-sensitive resistor configured to change its resistance value as a function of a luminous flux.