Solid State Lighting Driver Circuit with Ballast Compatibility
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United States of America Patent
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app pub date -
Nov 3, 2017
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May 27, 2015
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Abstract
A solid state lighting driver circuit containing an input for connection with a ballast; an output for driving a light emitting element; and a switch is provided. The switch is selectively operable to transition between a first state providing a low impedance path for a ballast output and a second state where the ballast output drives the output. A solid state lighting driver circuit has a switch connected across its input that selectively drives the circuit with a ballast output, or provides a low impedance path for the ballast output so that the ballast goes into self-protection mode. This means that the driver circuit is compatible with an electronic ballast but is well regulated. Also, a method controlling a solid state lamp for selectively driving a load with a ballast or providing a low impedance path for a ballast output is presented.
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