HIGH POWER FACTOR LED-BASED LIGHTING APPARATUS AND METHODS
First Claim
1. A lighting apparatus, comprising:
- at least one LED-based light source; and
a switching power supply for providing power factor correction and an output voltage to the at least one LED-based light source via control of a single switch, without requiring any feedback information associated with the at least one LED-based light source.
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Abstract
Power control methods and apparatus in which a switching power supply provides power factor correction and an output voltage to a load via control of a single switch, without requiring any feedback information associated with the load. The single switch may be controlled without monitoring either the output voltage across the load or a current drawn by the load, and/or without regulating either the output voltage across the load or the current drawn by the load. The RMS value of an A.C. input voltage to the switching power supply may be varied via a conventional A.C. dimmer (e.g., using either a voltage amplitude or duty cycle control technique) to in turn control the output voltage. The switching power supply may comprise a flyback converter configuration, a buck converter configuration, or a boost converter configuration, and the load may comprise an LED-based light source.
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Citations
21 Claims
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1. A lighting apparatus, comprising:
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at least one LED-based light source; and a switching power supply for providing power factor correction and an output voltage to the at least one LED-based light source via control of a single switch, without requiring any feedback information associated with the at least one LED-based light source. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A lighting method, comprising:
A) providing power factor correction and an output voltage to at least one LED-based light source via control of a single switch, without requiring any feedback information associated with the at least one LED-based light source. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A lighting apparatus comprising:
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at least one LED-based light source; and a switching power supply for providing power factor correction and an output voltage to the at least one LED-based light source via control of a single switch, without requiring any feedback information associated with the at least one LED-based light source, the switching power supply comprising; the single switch; and a transition mode power factor corrector controller coupled to the single switch, wherein the controller is configured to control the single switch using a fixed off time (FOT) control technique, and wherein the controller does not have any input that receives a signal relating to the output voltage across the at least one LED-based light source or a current drawn by the at least one LED-based light source during normal operation of the lighting apparatus. - View Dependent Claims (17, 18)
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19. A lighting system, comprising:
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at least one LED-based light source; a switching power supply for providing power factor correction and an output voltage to the at least one LED-based light source via control of a single switch, without requiring any feedback information associated with the at least one LED-based light source; and an A.C. dimmer to vary an RMS value of an A.C. input voltage applied to the power supply, wherein the output voltage to the at least one LED-based light source varies based at least in part on the RMS value of the A.C. input voltage. - View Dependent Claims (20, 21)
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Specification