Electronic light generating element light bulb

• US 7,215,086 B2
• Filed: 08/09/2004
• Issued: 05/08/2007
• Est. Priority Date: 04/23/2004
• Status: Active Grant

• Current Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Maxik, Fredric
• Primary Examiner(s): Dinh; Trinh Vo
• Assistant Examiner(s): Vy; Hung T.
• Application Number:
  US10/915,531
• Publication Number:
  US 20050237005A1
• Time in Patent Office: 1,002 Days
• Field of Search: 315/247, 315/224, 315/246, 315/291
• US Class Current: 315/247
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 3/02 characterised by the shape
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/10 Controlling the intensity of the light
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/327 Burst dimming
• CPC Class Codes: H05B 45/3725 Switched mode power supply [SMPS]
• CPC Class Codes: H05B 45/50 responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs
• CPC Class Codes: H05B 45/59 for reducing or suppressing flicker or glow effects
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present system for driving an electronic light generating element, includes: (i) input terminals, (ii) an input circuit coupled to the input terminals and operable to convert a sinusoidal signal to a signal independent of negative current attributes, (iii) a switch control circuit coupled to the input circuit and operable to generate a switching signal having pulses, and (iv) a switching element coupled to the input circuit and the switch control circuit. The switching element is operable to generate an output signal formed as a series of bursts having peak amplitudes above a maximum forward current rating for a duty cycle less than a maximum operating duty cycle over which an electronic light generating element may be catastrophically damaged in response to the signal independent of negative current attributes and switching being applied to the switching element. The output signal is applied to the electronic light generating element to produce light.

Claims

1. An apparatus comprising:

an electronic light generator having a maximum current rating; and

a circuit producing an electric signal that drives said electronic light generator, said electric signal including a pulse train that has a plurality of first pulses and a plurality of second pulses, the amplitudes of said second pulses being less than the amplitudes of said first pulses, and said pulse train being configured as successive groups of pulses that each start with one of said first pulses and that each include at least one of said second pulses, at least some of said pulses of said pulse train having a peak current value above said maximum current rating, said output signal being in excess of said maximum current rating less than ten percent of the time.

2. The apparatus according to claim 1, wherein said pulses each have a rise time to a peak value, and have a fall time from the peak value that is longer than the rise time.

3. The apparatus according to claim 1, wherein said groups have respective time durations that are approximately equal.

4. The apparatus according to claim 1, wherein said circuit selectively varies a frequency of said pulse train.

5. The apparatus according to claim 1, wherein each said group includes at least two of said second pulses.

6. The apparatus according to claim 1, wherein said electronic light generator is a light emitting diode.

7. A method comprising generating a electric signal for driving an electronic light generator having a maximum current rating, said electric signal including a pulse train that has a plurality of first pulses and a plurality of second pulses, the amplitudes of said second pulses being less than the amplitudes of said first pulses, and said pulse train being configured as successive groups of pulses that each start with one of said first pulses and that each include at least one of said second pulses, at least some of said pulses of said pulse train having a peak current value above said maximum current rating, said output signal being in excess of said maximum current rating less than ten percent of the time.

8. The apparatus according to claim 7, wherein said generating includes causing said pulses to each have a rise time to a peak value, and to have a fall time from the peak value that is longer than the rise time.

9. The apparatus according to claim 7, wherein said generating includes configuring said groups to have respective time durations that are approximately equal.

10. The apparatus according to claim 7, wherein said generating includes selectively varying a frequency of said pulse train.

11. The apparatus according to claim 7, wherein said generating includes configuring each said group to have at least two of said second pulses.

12. The apparatus according to claim 7, including selecting a light emitting diode to serve as said electronic light generator.