METHOD FOR MEASURING THE THERMAL RESISTANCE OF THE JUNCTION-TO-BODY LED Russian patent published in 2022 - IPC G01R31/26 

FIELD: LEDs thermal characteristics controlling.

SUBSTANCE: invention relates to the technique of controlling the thermal characteristics of LEDs and can be used to control the quality of mounting LED crystals on a mounting plate, including LEDs as part of LED arrays and modules. A method for measuring the thermal resistance of the junction-LED housing, which consists in passing a heating current pulse of a given strength I_m and duration t through the LED, approximately equal to the thermal time constant τ_Tj-h the junction-LED housing, and in measuring the brightness of the LED radiation with a luxmeter, characterized in that immediately after the current pulse is turned on, the brightness value E₀ of the LED radiation is measured, after a time t_i/2 after the current pulse is turned on, the forward voltage U_m on the diode and the brightness value E₁ of the radiation are measured, and after a time t_i after the current pulse is turned on, the brightness value E₂ of the LED radiation and thermal resistance transition-LED housing is determined by the formula

,

where is the heating power dissipated by the LED, ξ is the average value of the quantum efficiency and the average temperature decay coefficient of the radiation intensity of this type of LEDs at a given current, respectively b₁=ln(E₁/E₀); b₂=ln(E₂/E₀).

EFFECT: LEDs thermal characteristics controlling technique improvement.

1 cl, 1 dwg