Color temperature controlled and low THD LED lighting devices and systems and methods of driving the same
First Claim
Patent Images
1. An LED lighting device comprising:
- at least two LED circuits connected in parallel, each of the at least two LED circuits having one or more LEDs, each LED circuithaving a different forward operating voltage than the other LED circuits, and,being capable of emitting light having one or more of a different color or wavelength than the other LED circuits;
at least one active current limiting device being connected in series with at least one LED in at least one of the at least two LED circuits,wherein each LED circuit is capable of emitting light during both a positive and a negative phase of a provided AC voltage when the LED lighting device is connected to an AC voltage source.
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Abstract
The purposes of the devices described herein are to provide an LED lighting device capable of efficiently and economically emitting light having a selectable color temperature or a warm-on-dim feature when driven with AC power and to provide LED lighting devices which have an improved power factor and a reduced total harmonic distortion when powered with AC power.
109 Citations
50 Claims
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1. An LED lighting device comprising:
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at least two LED circuits connected in parallel, each of the at least two LED circuits having one or more LEDs, each LED circuit having a different forward operating voltage than the other LED circuits, and, being capable of emitting light having one or more of a different color or wavelength than the other LED circuits; at least one active current limiting device being connected in series with at least one LED in at least one of the at least two LED circuits, wherein each LED circuit is capable of emitting light during both a positive and a negative phase of a provided AC voltage when the LED lighting device is connected to an AC voltage source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of controlling color temperature of light emitted by an LED lighting device, the method comprising the steps of:
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connecting at least two LED circuits in parallel, with each LED circuit having a different forward operating voltage and being capable of emitting light of one or more of a different color or wavelength than the other LED circuits; rectifying an AC voltage and current providing the rectified AC voltage and a current to the at least two LED circuits; limiting the current provided to at least one of the at least two LED circuits; adjusting at least one of the provided voltage and current to control the light output of the LEDs connected in parallel. - View Dependent Claims (18)
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19. An LED lighting device comprising:
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at least one LED circuit having at least two or more LEDs connected in series; at least one active current limiting device, the active current limiting device being connected in parallel with the at least one LED in the at least one LED circuit, and at least a second active current limiting device, the second active current limiting device being connected in series with the at least one LED circuit. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27)
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28. An LED lighting device comprising:
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at least one LED circuit having at least two LEDs connected in series; a first set of connection leads configured to provide a connection to the at least two LEDs in the at least one LED circuit, the first set of connection leads having a first connection lead and a second connection lead, the first connection lead being connected to an input of the at least one LED circuit and, the second connection lead being connected to an output of the at least one LED circuit; and
,a second set of connection leads, the second set of connection leads having a third connection lead and a fourth connection lead, the third connection lead being to the anode of at least one of the at least two LEDs the fourth connection lead being connected to the cathode of at least one of the at least two LEDs, wherein the second set of connection leads are configured to provide a connection to less than all of the LEDs in the at least one circuit. - View Dependent Claims (29, 30, 31, 32, 33)
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34. An LED lighting device comprising:
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a bridge rectifier; at least one LED circuit having at least two LEDs connected in series across the output of the bridge rectifier; a first set of connection leads configured to provide a connection to the bridge rectifier, the first set of connection leads having a first connection lead and a second connection lead, the first and second connection leads being connected to provide an electrical input and output from the bridge rectifier; a second set of connection leads configured to provide a connection to at least one of the least two LEDs connected in series across the output of the bridge rectifier, the second set of connection leads having a third connection lead and a fourth connection lead; the third connection lead being connected to the anode of one of the at least two LEDs the fourth connection lead being connected to the cathode of one of the at least two LEDs. - View Dependent Claims (35, 36)
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37. An LED lighting device comprising:
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at least one LED circuit having at least two or more LEDs connected in series; at least one active current limiting device, the active current limiting device being connected in parallel with the at least one LED in the at least one LED circuit, and a bridge rectifier, wherein the at least one LED circuit is connected across the output of the bridge rectifier. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44)
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45. An LED lighting device comprising:
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at least one LED circuit having at least two or more LEDs connected in series; at least one active current limiting device, the active current limiting device being connected in parallel with the at least one LED in the at least one LED circuit, and at least one additional LED circuit having two or more LEDs connected in series, and at least one active current limiting device connected in parallel with at least one of the two or more LEDs in the at least one addition LED circuit, the at least one additional LED circuit being connected to the at least one LED circuit in parallel. - View Dependent Claims (46, 47, 48, 49, 50)
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Specification