AC-POWERED LED LIGHT ENGINES, INTEGRATED CIRCUITS AND ILLUMINATING APPARATUSES HAVING THE SAME
First Claim
1. An ac-powered LED light engine, coupled between a rectifier and a plurality of extrinsic LED sub-arrays, comprising:
- a plurality of normally closed bypass switches, each connected in parallel with a corresponding LED sub-array except for a topmost or a bottommost LED sub-array and shuttling between three switch states;
ON, REGULATION, and OFF;
a normally closed current regulator coupled to the corresponding normally closed bypass switches and used to regulate a highest LED current level near a peak of an extrinsic mains voltage; and
a plurality of switch controllers each coupled to a corresponding normally closed bypass switch as a feedback network and taking control of the three switch states according to a corresponding current sense signal.
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Accused Products
Abstract
An ac-powered LED light engine coupled between a rectifier and a plurality of extrinsic LED sub-arrays is provided. The ac-powered LED light engine comprises a plurality of normally closed bypass switches, a normally closed current regulator, and a plurality of switch controllers. Each of the normally closed bypass switches is connected in parallel with a corresponding LED sub-array except for the topmost or the bottommost LED sub-array and shuttles between three switch states: ON, REGULATION, and OFF. The normally closed current regulator is coupled to the normally closed bypass switches and used to regulate the highest LED current level near the peak of an extrinsic mains voltage. Each of the switch controllers is coupled to a corresponding bypass switch as a feedback network and takes control of the three switch states according to a corresponding current sense signal.
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Citations
20 Claims
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1. An ac-powered LED light engine, coupled between a rectifier and a plurality of extrinsic LED sub-arrays, comprising:
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a plurality of normally closed bypass switches, each connected in parallel with a corresponding LED sub-array except for a topmost or a bottommost LED sub-array and shuttling between three switch states;
ON, REGULATION, and OFF;a normally closed current regulator coupled to the corresponding normally closed bypass switches and used to regulate a highest LED current level near a peak of an extrinsic mains voltage; and a plurality of switch controllers each coupled to a corresponding normally closed bypass switch as a feedback network and taking control of the three switch states according to a corresponding current sense signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An illuminating apparatus, comprising:
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a rectifier coupled to an AC mains for providing a rectified voltage; an ac-powered LED light engine coupled between the rectifier and a plurality of extrinsic LED sub-arrays, wherein the ac-powered LED light engine comprises; a plurality of normally closed bypass switches, each connected in parallel with a corresponding LED sub-array except for a topmost LED sub-array or a bottommost LED sub-array and shuttling between three switch states;
ON, REGULATION, and OFF;a normally closed current regulator coupled to a normally closed bypass switches and used to regulate a highest LED current level near a peak of an extrinsic mains voltage; a plurality of current-sensing resistors connected to a plurality of extrinsic LED sub-arrays; and a plurality of switch controllers each coupled between a corresponding current-sensing resistor or a corresponding current sense tap and the corresponding normally closed bypass switch as a feedback network and taking control of the three switch states according to a corresponding current sense signal. - View Dependent Claims (17, 18, 19, 20)
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Specification