Reactive Circuit and Rectifier Circuit

• US 20090009100A1
• Filed: 01/05/2006
• Published: 01/08/2009
• Est. Priority Date: 01/05/2005
• Status: Abandoned Application

• Current Assignee: Lemnia Lighting IP GmbH
• Original Assignee: Lemnia Lighting IP GmbH
• Inventors: Rooymans, Johannus Otto
• Application Number:
  US11/794,778
• Publication Number:
  US 20090009100A1
• Time in Patent Office: Days
• US Class Current: 315/246
• CPC Class Codes: H01L 2924/3011 Impedance
• CPC Class Codes: H02M 1/00 Details of apparatus for conversion
• CPC Class Codes: H05B 45/40 Details of LED load circuits
• CPC Class Codes: H05B 45/44 with an active control inside an LED matrix
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The invention relates to a reactive circuit for correction of a power factor in an electrical network. The reactive circuit has at least one supply connection for supplying an alternating power supply (1) current and an input stage that is connected to the at least one supply connection. The reactive circuit is furthermore provided with one or more LEDs (12, 13). In use, the reactive circuit has an essentially reactive input impedance and the input stage generates a correction current. The reactive circuit is set up for lighting a space by loading the one or more LEDs with the at least nearly full correction current.

Claims

1. Reactive circuit for correction of a power factor in an electrical network comprising

at least one supply connection for supplying an alternating power supply current;

an input stage that is connected to the at least one supply connection and in use generates an essentially reactive input impedance and a correction current for correction of the power factor;

one or more LEDs;

characterised in that the reactive circuit is set up for lighting a space by loading one or more LEDs with the at least nearly full correction current.

2. Reactive circuit according to claim 1, characterised in that the correction current has an electrical current intensity of at least 200 mA.

3. Reactive circuit according to claim 1 or 2, characterised m that the input stage comprises at least one capacitor (2) connected in series between the at least one supply connection and the one or more LEDs.

4. Reactive circuit according to claim 3, characterised in that the circuit is placed on a substrate (20), wherein a first heat-conducting surface (21) has been applied to a first side of the substrate and an electrically conducting surface (22) has been applied to a second side of the substrate, which electrically conducting surface is organised for permanent joining to the one or more LEDs.

5. Reactive circuit according to claim 4, characterised in that the permanent joining of the one or more LEDs to the electrically conducting surface (52) on the second side of the substrate (50) is achieved by soldering.

6. Reactive circuit according to claim 4 or 5, characterised in that the electrically conducting surface (52) comprises at least one of the elements from a group comprising silver (Ag), chromium (Cr), nickel (Ni) and copper (Cu) comprises and the substrate (50) comprises ceramic.

7. Reactive circuit according to any one of the preceding claims, characterised in that the reactive circuit contains a two-phase rectifier circuit (3, 4, 5, 11, 14) that puts one or more LEDs under load for each phase.

8. Reactive circuit according to claim 7, characterised in that the two-phase rectifier circuit comprises a diode bridge circuit (5, 11, 14), wherein the diode bridge circuit (5, 11, 14) comprises a current branch comprising diodes (6, 7, 8, 9) for each phase, wherein part of both current branches comprises a common section and the common section comprises the one or more LEDs.

9. Reactive circuit according to claim 8, characterised in that the common section of both current branches comprises at least two parallel electrically conducting paths that each comprise at least one or more LEDs.

10. Reactive circuit according to claim 8 or 9, characterised m that at least one additional capacitor (15) is connected in parallel with the common section of both current branches.

11. Reactive circuit according to any one of claims 8-10, characterised in that at least one of the diodes (6, 7, 8, 9) in the diode bridge circuit (5, 11, 14) is a LED.

12. Reactive circuit according to any one of the preceding claims, characterised in that it contains various LEDs and different LEDs can generate light of another colour.

13. Reactive circuit according to claim 12, characterised in that the reactive circuit furthermore comprises an adjusting element (17, 30, 31, 32, 33) for setting the colour to be emitted.

14. Reactive circuit according to claim 13, characterised in that the adjusting element is a variable resistor (17, 32).

15. Reactive circuit according to claim 13, characterised in that the adjusting element is incorporated in a colour correction circuit.

16. Reactive circuit according to claim 15, characterised in that the colour correction circuit comprises a transistor (31) and an NTC resistor (30), wherein the NTC resistor (30) is connected to the base of the transistor (31).

17. Reactive circuit according to claim 15, characterised in that the colour correction circuit comprises a transistor (31) and a phototransistor (33), wherein the phototransistor (33) is connected to the base of the transistor (31).

18. Reactive circuit according to claim 17, characterised in that the phototransistor (33) is a Darlington transistor.

19. Reactive circuit according to claim 18, characterised in that the reactive circuit generates virtually white light in use.

20. Reactive circuit according to claim 1, characterised in that the reactive circuit comprises a bridge circuit containing several diode bridge circuits (5, 11, 14), wherein each diode bridge circuit comprises a current branch comprising diodes (6, 7, 8, 9) for each phase, wherein part of both current branches is a common section and the common section comprises the one or more LEDs.

21. Reactive circuit according to claim 20, characterised in that the diode bridge circuits (5, 11, 14) in the bridge circuit generate light of different wavelengths in use.

22. Reactive circuit according to claim 21, characterised in that the generated wavelength per diode bridge circuit (5, 11, 14) is chosen such that the lighting device generates virtually white light in use.

23. Reactive circuit according to any one of the preceding claims, characterised in that the input stage is made up of a capacitor array that comprises one or more capacitors connected in parallel.

24. Reactive circuit according to any one of the preceding claims, characterised in that the at least one supply connection is suitable for connecting the device to an electricity network (1).

25. Reactive circuit according to any one of the preceding claims, characterised in that the reactive circuit furthermore comprises a protection circuit.

26. Rectifier circuit for electrically loading at least one LED, wherein the rectifier circuit is a two-phase rectifier circuit that comprises a diode bridge circuit (5, 11, 14), wherein the diode bridge circuit (5, 11, 14) comprises a current branch comprising diodes (6, 7, 8, 9) for each phase, characterised in that part of both current branches comprises a common section, wherein the common section comprises the at least one LED and the at least one LED is loaded to an electrical power of at least 60 mW.

27. Rectifier circuit according to claim 26, characterised in that the common section of both current branches comprises two parallel electrically conducting paths that each comprise one or more LEDs.

28. Rectifier circuit according to claim 26 or 27, characterised in that at least one capacitor (15) is connected in parallel with the common section of both current branches.

29. Rectifier circuit according to one of claims 26-28, characterised in that at least one of the diodes (6,7,8,9) in the diode bridge circuit (5,11,14) is a LED.

30. Rectifier circuit according to one of claims 26-29, characterised in that it comprises various LEDs, and different LEDs can generate light of another colour.

31. Rectifier circuit according to claim 30, characterised in that the rectifier circuit generates virtually white light in use.