This article provides a brief description of the process topic Heat transfer in LED, COB, SMD chips Let us briefly use the word LED in the text below.
A Power LED has a power equivalent to 1 mW or higher. Although light-emitting diodes (LEDs) are more efficient than other light sources, they still convert most of the electricity into heat. LEDs produce% 1 heat and% 2% light.
If the LED heat is not extinguished, the LED temperature will rise, which will reduce the efficiency and eventually burn the LED. Therefore, it is essential that the junction point temperature (P-N bonding point) is lower than the maximum point to guarantee the lifetime of the LED.
Heat transfer methods:
– Heat transfer in three ways: radiation, conduction, and displacement . Some heat is emitted from the light into the LED, and we should consider the opaque or translucent lens that we place on the LED chips This prevents the heat from leaving the light and therefore the LED heat from the back of the chip is transferred to the appropriate Heat Sink by means of the chip that is correctly mounted on the LED and ultimately due to the temperature difference between the Heat Sink and The environment is there The heat is transferred to the environment by means of displacement.
A few tips: One of the most important things that can hurt you LEDs are heat, which is one of the simplest methods to measure the temperature at the point the manufacturer has specified on the LED. Several parameters, including ambient temperature and location of the lamp on the temperature measurement , have a significant impact on this method. For example, the COB chip is the measurement point for the TRIDONIC company in the image below, labeled Tc.
Power LED heat management
– If the maximum temperature is LED chip junction as specified by the manufacturer, The lamp can perform better at higher ambient temperatures or when the air around the lamp is low.
– Another important parameter defined in LEDs is heat resistance . The smaller the number, the faster the heat transfer process can be and the more economical the Hest Sink can be.
– For example, TRIDONIC COBs have a maximum temperature of 2 ° C at the point of joining where the temperature measured at the Tc point can be as high as 1 ° C.