Illumination systems

• US 9,706,614 B2
• Filed: 11/14/2015
• Issued: 07/11/2017
• Est. Priority Date: 04/10/2006
• Status: Expired due to Fees

• Current Assignee: EMD Technologies Inc (Benchmark Electronics Incorporated)
• Original Assignee: EMD Technologies Inc (Benchmark Electronics Incorporated)
• Inventors: Beland, Robert, Carli, Giampaolo
• Primary Examiner(s): CRAWFORD, JASON
• Application Number:
  US14/757,079
• Publication Number:
  US 20160165685A1
• Time in Patent Office: 605 Days
• Field of Search: 315291, 315294, 315297, 315307
• CPC Class Codes: H02M 1/4258 using a single converter stage both for correction of AC input power factor and generation of a regulated and galvanically isolated DC output voltage H02M1/4241 takes precedence
• CPC Class Codes: H04B 2203/5458 Monitor sensor; Alarm systems
• CPC Class Codes: H05B 39/04 Controlling
• CPC Class Codes: H05B 39/044 continuously H05B39/042 takes precedence
• CPC Class Codes: H05B 45/38 using boost topology
• CPC Class Codes: H05B 45/382 with galvanic isolation between input and output
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

An illumination system includes a master power supply providing power to several illumination modules. The master power supply is constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current loop. Each illumination module includes an electromagnetic coupling element and several light sources.

Claims

1. An illumination system, comprising:

a master power supply constructed and arranged to generate high-frequency and low-voltage electrical power provided to a primary wire forming a current-carrying loop; and

an illumination module including an electromagnetic coupling element and a light source, said electromagnetic coupling element including a magnetic core arranged to receive said current-carrying loop, and a secondary wire wound around at least a portion of said magnetic core to enable inductive coupling from said primary wire, said secondary wire being connected to provide current to said light source.

2. The illumination system of claim 1 wherein said light source includes one or more light emitting diodes.

3. The illumination system of claim 2 wherein said illumination module includes a switch that acts as an on/off shunt for said one or more light emitting diodes.

4. The illumination system of claim 2 wherein said light emitting diodes include a red light emitting diode, a green light emitting diode, and a blue light emitting diode.

5. The illumination system of claim 1 wherein said light source includes one or more incandescent lights.

6. The illumination system of claim 1 wherein said magnetic core and a part of said secondary wire wound around said core are encapsulated, thereby sealing said core and said secondary wire portion while enabling displacement of said primary wire with respect to said encapsulated magnetic core.

7. The illumination system of claim 1 wherein said magnetic core is shaped to include a closed magnetic path, and wherein said secondary wire is wound around at least a portion of said core to provide electromagnetic coupling.

8. The illumination system of claim 7 wherein said primary wire is located inside through said closed magnetic path of said core and arranged to provide electromagnetic coupling to said secondary wire.

9. The illumination system of claim 7 wherein said closed magnetic path of said magnetic core includes two or more ferromagnetic elements.

10. The illumination system of claim 1 wherein said master power supply includes a resonant inverter and an amplitude modulator, and said illumination module includes a frequency discriminator.

11. The illumination system of claim 10 wherein said resonant inverter provides an output in a frequency range of about 20 kHz to about 40 kHz.

12. The illumination system of claim 10 wherein said amplitude modulator provides an output at a modulation frequency in a range of about 1 kHz to about 10 kHz.

13. The illumination system of claim 10 wherein said light source includes red, green and blue light emitting diodes and said frequency discriminator includes a separate frequency discriminator associated with said red light emitting diode, said green light emitting diode, and said blue light emitting diode constructed for separate illumination.

14. The illumination system of claim 1 wherein said master power supply includes a resonant inverter, and a current limiter providing an AC current source.

15. The illumination system of claim 14 wherein said resonant inverter includes two transistors connected back to back in a push-pull arrangement.

16. The illumination system of claim 1 wherein said master power supply includes:

a resonant inverter constructed and arranged to generate a high-frequency and low-voltage electrical output;

an AC current source including an inductor connected to receive said electrical output; and

a transformer including a primary side and a secondary side, said primary side being connected to receive said high-frequency and low-voltage electrical output and said secondary side being connected to a current limiter and being arranged to provide current to said current carrying loop.

17. The illumination system of claim 1 wherein said master power supply includes a microcontroller connected to receive control signals from a module controller.

18. The illumination system of claim 1 wherein said illumination module is constructed to enable dimming of said light source.

19. The illumination system of claim 1 wherein said master power supply further includes a power factor corrector.

20. The illumination system of claim 19 wherein said power factor corrector includes a switch coupled to an inductor and a diode to provide boost voltage output.

21. The illumination system of claim 20 wherein said power factor corrector includes said switch coupled in a feedback arrangement to an output voltage regulator.

22. The illumination system of claim 21 further including a current feedback loop.

23. The illumination system of claim 1 wherein said master power supply further includes a pulse width modulation line regulator.

24. The illumination system of claim 23 wherein said pulse width modulation line regulator includes a buck converter.

25. The illumination system of claim 1 wherein said master power supply includes a loop current sensor and an open circuit voltage sensor.

26. The illumination system of claim 1 wherein said master power supply includes a microcontroller for controlling a loop current and maximum power.

27. An illumination method, comprising:

generating high-frequency and low-voltage electrical power;

providing said high-frequency and low-voltage electrical power to a primary wire forming a current loop;

coupling energy from said current loop in a contactless manner to a secondary wire; and

delivering current from said secondary wire to one or more light sources.

28. The illumination method of claim 27 comprising controlling said high-frequency and low-voltage electrical power, and

sensing a loop current by monitoring output of said high-frequency and low-voltage electrical signal.

29. The illumination method of claim 27 comprising dimming said one or more light sources.