LED drive circuit, LED illumination fixture, LED illumination device, and LED illumination system
First Claim
Patent Images
1. An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer;
- the LED drive circuit comprising;
an edge detector for detecting an edge of the output voltage of said phase control dimmer; and
a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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Abstract
An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer The LED drive circuit is provided with an edge detector for detecting an edge of the output voltage of the phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to the LED; wherein the value of the current extracted from the current feed line by the current extractor is varied in accordance with the detection results of the edge detector.
13 Citations
21 Claims
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1. An LED drive circuit in which an alternating voltage is input and an LED is driven, and which can be connected to a phase control dimmer;
- the LED drive circuit comprising;
an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- the LED drive circuit comprising;
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16. An LED illumination fixture comprising:
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an LED drive circuit; and an LED connected to an output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit comprising;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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17. An LED illumination device comprising:
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an LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit comprising;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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18. An LED illumination device comprising:
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an LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture comprising; an LED drive circuit; and an LED connected to an output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit comprising;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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19. An LED illumination system comprising:
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an LED illumination fixture; and a phase control dimmer connected to an input side of said LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture having; an LED drive circuit; and an LED connected to an output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit comprising;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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20. An LED illumination system comprising:
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an LED illumination device; and a phase control dimmer connected to an input side of said LED illumination device; wherein said LED illumination device is an LED illumination device having; an LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit having;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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21. An LED illumination system comprising:
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an LED illumination device; and a phase control dimmer connected to an input side of said LED illumination device; wherein said LED illumination device is an LED illumination device having; an LED illumination fixture; wherein said LED illumination fixture is an LED illumination fixture having; an LED drive circuit; and an LED connected to an output side of said LED drive circuit; wherein said LED drive circuit is an LED drive circuit in which an alternating voltage is input and said LED is driven, and which can be connected to a phase control dimmer;
the LED drive circuit having;an edge detector for detecting an edge of the output voltage of said phase control dimmer; and a current extractor for extracting a current from a current feed line for feeding an LED drive current to said LED;
whereinthe value of the current extracted from said current feed line by said current extractor is varied in accordance with the detection results of said edge detector.
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Specification