SYSTEM AND DEVICE FOR DRIVING A PLURALITY OF HIGH POWERED LED UNITS

• US 20150312989A1
• Filed: 11/02/2012
• Published: 10/29/2015
• Est. Priority Date: 11/04/2011
• Status: Active Grant

• Current Assignee: Opulent Electronics International Pte. Ltd.
• Original Assignee: Opulent Electronics International Pte. Ltd.
• Inventors: Wee, Kai Fook Francis, Stona, Andrea, Tan, Chye Boon, Tan, Hai Boon, Chan, Soon Thiam
• Granted Patent: US 9,408,273 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H02H 11/002 in case of inverted polarity or connection; with switching for obtaining correct connection
• CPC Class Codes: H02H 7/20 for electronic equipment for converters H02H7/10; for electric measuring instruments G01R1/36; for dc voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08
• CPC Class Codes: H02H 9/041 using a short-circuiting device
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/385 using flyback topology
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/59 for reducing or suppressing flicker or glow effects
• CPC Class Codes: H05B 47/105 in response to determined parameters
• CPC Class Codes: H05B 47/11 by determining the brightness or colour temperature of ambient light
• CPC Class Codes: H05B 47/19 via wireless transmission

Abstract

A system for driving a plurality of high powered LED units, the system comprising a single driver for providing ripple free constant direct current to a plurality of high powered LED lamp units, wherein the single driver comprises a digital controller programmable to adjust the ripple free constant direct current at every predetermined time interval based on detection and computation of the duration taken for the energy to be discharged to the LED lamp unit to adjust the ripple free constant direct current. The above system achieves a one driver to many LED lamp units such that it alleviates or eliminates the need to have a driver attached to each LED lamp unit.

Claims

1. A system for driving a plurality of high powered LED units, the system comprising a single driver for providing ripple free constant direct current to a plurality of high powered LED lamp units,

wherein the single driver comprises a digital controller programmable to adjust the ripple free constant direct current at every predetermined time interval based on detection and computation of the duration taken for the energy to be discharged to the LED lamp unit to adjust the ripple free constant direct current.

2. A system according to claim 1, wherein the single driver operates in an isolated alternating current fly back configuration having an inductive element as a transformer isolating the plurality of high powered LEDs at the secondary end of the transformer.

3. A system according to claim 2, wherein the digital controller is an Application Specific Integrated Circuit (ASIC);

the ASIC further operable to detect and compute the duration of the energy discharged by the core of transformer to the plurality of high powered LEDs to regulate and provide the ripple free output DC current.

4. A system according to claim 3, wherein the ASIC is programmed to receive feedback at each clock-cycle based on the duration of the energy discharged by the core of the transformer as an input to determine the amount of ripple free constant DC current at the next clock-cycle.

5. A system according to claim 4, wherein the ASIC is programmed to provide a voltage waveform to turn an electronic switch on and off at each clock-cycle.

6. A system according to claim 1, wherein each of the plurality of high powered LED lamp units is in series with the other high powered LED lamp units.

7. A system according to claim 1, wherein the single driver is electrically connected to a dimmer circuitry for adjusting the brightness of the plurality of high powered LED lamp units.

8. A system according to claim 7, wherein the dimmer circuitry comprises a potential meter, infra-red interface, motion sensor or ambient sensor.

9. A system according to claim 7, wherein the system comprises a capacitor operable to vary its capacitance to maintain a power factor of at least 0.9 when the dimmer is adjusted.

10. A system according to claim 8, wherein the potential meter is operable to work within a voltage of 0 to 10V.

11. A system according to claim 2, wherein the secondary end of the transformer is electrically connected to a short circuit protection circuit.

12. A system according to claim 3, wherein the ASIC is coupled with active power factor controller.

13. A system according to claim 12, wherein the active power factor controller comprises at least one voltage follower.

14. A system according to claim 3, wherein the ASIC is of a 14-pin configuration.

15. A system according to claim 1, wherein each high powered LED lamp is provided with a heat sink shaped and configured to dissipate heat away from the high powered LED only.

16. A system according to claim 3, the system further comprising an electronic switch, wherein the ripple free constant DC current is achieved by means of voltage control according to the following equation:

—

17. A system according to claim 1, wherein the single driver operates in a non-isolated configuration having an inductive element operating in a continuous mode in according to the following equation:

—

18. A system according to claim 17, wherein for a hysteretic controller configuration, the value of I_MAX and I₁ may be fixed, and the T_ON and T_OFF timings determined.

26. A system according to claim 6 further comprising a device having an input port and a plurality of output ports comprising:

a reverse polarity protector arranged to be electrically connected to the input port and each of the plurality of output ports; and

a plurality of open circuit protection circuits, each of the plurality of open circuit protector operable to connect to an output port;

wherein the reverse polarity protector is operable to negate the polarity requirement in the event where a load is connected with a wrong polarity to any of the output port; and

the open circuit protection circuit is operable to form a closed loop series connection in the event where no load is connected to an output port or when a load breaks down;

wherein the input port of the device is operable to be connected to the single driver.

19. A LED driver comprising:

at least one Integrated Circuit (IC), the IC programmable using a hardware description language;

a first electronic switch operable to provide a first switching time period to control power factor voltage, the first switching time period programmable by the at least one IC; and

a second electronic switch operable to provide a second switching time period to regulate ripple free constant DC electrical current flowing into the at least one LED, the second switching time period is programmable by the at least one IC.

20. A LED driver according to claim 19, wherein the first and second electronic switches are power MOSFETs.

21. A LED driver according to claim 19, wherein the at least one IC is an ASIC.

22. A device having an input port and a plurality of output ports comprising:

a reverse polarity protector arranged to be electrically connected to the input port and each of the plurality of output ports; and

a plurality of open circuit protection circuits, each of the plurality of open circuit protection circuits operable to connect to an output port;

wherein the reverse polarity protector is operable to negate the polarity requirement in the event where a load is connected with a wrong polarity to any of the output port; and

the open circuit protection circuit is operable to form a closed loop series connection in the event where no load is connected to an output port or when a load breaks down.

23. A device according to claim 22, wherein the reverse polarity protector is a diode bridge rectifier.

24. A device according to claim 22, wherein each output port comprises a corresponding open circuit protector.

25. A device according to claim 22, wherein the input port is suitable for connection with a LED driver and each of the output port is suitable for connection with a load comprising a high powered LED lamp unit.

27. A dimmer circuitry for use with a LED driver, the dimmer circuitry comprising at least a dimming interface operable to connect to at least one dimming controller;

and a capacitive element adjustable to maintain a power factor of at least 0.9 within the dimmer circuitry.