US Patent No. 10,925,128

CURRENT TUNEBACK IN LIGHT EMITTING DIODE LUMINAIRES


Patent No. 10,925,128
Issue Date February 16, 2021
Title Current Tuneback In Light Emitting Diode Luminaires
Inventorship Hui Zhang, Manlius, NY (US)
Joseph Michael Manahan, Manlius, NY (US)
Assignee Eaton Intelligent Power Limited

Claim of US Patent No. 10,925,128

1. A light emitting diode (LED) luminaire, comprising:an LED load, including at least one light emitting diode and at least one temperature sensor;
a driving circuit providing power to the LED load, including a current controller in communication with the at least one temperature sensor, the current controller configured to regulate an amount of power provided to the LED load in response to a temperature of the LED load measured by the at least one temperature sensor, wherein the current controller is configured to receive an indication of the temperature of the LED from the at least one temperature sensor and output signals to the driving circuit to regulate the amount of power by
providing a predetermined nominal amount of power to the LED load;
decreasing the amount of power provided to the LED load below the nominal amount of power in response to the temperature of the LED load as measured by the at least one temperature sensor exceeding a predetermined high threshold temperature;
after decreasing the amount of power provided to the LED load, increasing the amount of power provided to the LED load up to the nominal amount of power in response to the temperature of the LED load measured by the at least one temperature sensor reaching a predetermined cooldown temperature and in response to the amount of power provided to the LED load being below the nominal amount of power;
wherein increasing the amount of power up to the nominal amount of power in response to the temperature reaching the predetermined cooldown temperature further comprises waiting to increase the power until a predetermined time threshold has passed after decreasing the amount of power; and
wherein the predetermined time threshold is set according to at least one of a number of clock cycles in a microprocessor between determining that the temperature of the LED load as measured by the at least one temperature sensor does not exceed the predetermined high threshold temperature and determining the temperature of the LED load measured by the at least one temperature sensor has reached the predetermined cooldown temperature and the amount of power provided to the LED load is below the nominal amount of power, an averaging of a plurality of the temperatures in a register of the LED load measured by the at least one temperature sensor, or an operating speed of the current controller.