| 摘要 |
A thermal protection circuit, and system and method including same, is provided. The circuit includes a variable impedance circuit configured to be coupled to a constant current source and a plurality of solid state light sources. The constant current source provides a current to the plurality of solid state light sources and provides an output voltage to establish a supply voltage for the circuit. The circuit also includes a temperature sensor configured to sense a temperature of the plurality of solid state light sources. The circuit also includes a control circuit configured to receive the supply voltage and to drive the variable impedance circuit based on the sensed temperature, to adjust the current to the plurality of solid state light sources when the supply voltage is a least a minimum supply voltage of the control circuit.
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