CIRCUIT AND METHOD FOR DRIVING A LUMINOUS MEANS

• US 20110199017A1
• Filed: 01/07/2011
• Published: 08/18/2011
• Est. Priority Date: 02/15/2010
• Status: Active Grant

• Current Assignee: OSRAM GmbH (Ams-Osram AG)
• Original Assignee: OSRAM GmbH (Ams-Osram AG)
• Inventors: Dilger, Richard
• Granted Patent: US 8,816,598 B2
• Time in Patent Office: Days
• US Class Current: 315/291
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A circuit for driving a luminous means is provided. The circuit may include a driver circuit having an input and an output, wherein the output of the driver circuit is connected to the luminous means; and a detector circuit, on the basis of which, depending on an input signal of the driver circuit, a capacitor can be connected to the output of the driver circuit or to the input of the driver circuit.

Claims

1. A circuit for driving a luminous means, the circuit comprising:

a driver circuit having an input and an output, wherein the output of the driver circuit is connected to the luminous means; and

a detector circuit, on the basis of which, depending on an input signal of the driver circuit, a capacitor can be connected to the output of the driver circuit or to the input of the driver circuit.

2. The circuit as claimed in claim 1,

wherein the driver circuit has a switching regulator or a step-up converter.

3. The circuit as claimed in claim 2,

wherein the driver circuit has an SEPIC converter.

4. The circuit as claimed in claim 1,

wherein the detector circuit connects the capacitor to the output of the driver circuit or to the input of the driver circuit by means of two controllable electronic switches.

5. The circuit as claimed in claim 4,

wherein the electronic switch comprises one of the following components:

a semiconductor switch,

a transistor,

a field effect transistor,

a MOSFET,

a BiCMOS switch, and

an IGBT.

6. The circuit as claimed in claim 1,

wherein the capacitor is a ceramic capacitor.

7. The circuit as claimed in claim 1,

wherein the capacitor can be connected to the input of the driver circuit during a pause of the input signal of the driver circuit.

8. The circuit as claimed in claim 7,

wherein the capacitor can be connected to the input of the driver circuit during the pause of the input signal of the driver circuit for a predefined time duration.

9. The circuit as claimed in claim 8,

wherein the capacitor can be connected to the input of the driver circuit during the pause of the input signal of the driver circuit around the middle of the pause.

10. The circuit as claimed in claim 7,

wherein the duration of the pause can be determined with the aid of the detector circuit.

11. The circuit as claimed in claim 1,

wherein the detector circuit drives a modulation of the driver.

12. The circuit as claimed in claim 11,

wherein the detector circuit reduces the modulation of the driver if the capacitor is connected to the input of the driver circuit.

13. The circuit as claimed in claim 1,

wherein the input of the driver is connected to the output of a rectifier.

14. The circuit as claimed in claim 13,

wherein a dimmer is connected upstream of the rectifier.

15. The circuit as claimed in claim 1,

wherein the luminous means comprises at least one semiconductor luminous element.

16. The circuit as claimed in claim 15,

wherein the luminous means comprises at least one light-emitting diode.

17. A method for driving a luminous means, the method comprising:

connecting an output of a driver circuit having an input and the output to the luminous means, and

connecting a capacitor to the output of the driver circuit or to the input of the driver circuit depending on an input signal of the driver circuit.

18. The method as claimed in claim 17, further comprising:

detecting a pause of the input signal of the driver circuit, and

connecting the capacitor to the input of the driver circuit at least temporarily during the pause.

19. The method as claimed in claim 18,

wherein the capacitor is connected to the input of the driver circuit at least temporarily around the middle of the pause.

20. A luminaire or a lamp, comprising:

a circuit for driving a luminous means, the circuit comprising;

a driver circuit having an input and an output, wherein the output of the driver circuit is connected to the luminous means; and

a detector circuit, on the basis of which, depending on an input signal of the driver circuit, a capacitor can be connected to the output of the driver circuit or to the input of the driver circuit.