Explain various LED heat dissipation technologies and insight into LED lamp cool

Posted by Mingfatech on June 4th, 2018

Diodes (LEDs ) is light , thin , power-efficient , environmentally friendly , light-on-reaction , and long-lived . Along with the cost reductions , the light output and power are still increasing , which has led to a growing market acceptance of LED lighting . The signage light reaches large-size backlight sources and it has been used in various lighting applications such as headlights , indoor and outdoor lighting fixtures . At this stage , LED luminous efficiency has exceeded 100 lumens per watt , enough to replace the power of incandescent , halogen , and even fluorescent lamps and high pressure gas discharge lamps . With the advent of superposition of high-power LED technology , LED size is gradually reduced , heat is concentrated on small-size chips , and the heat density is higher , which causes to LED to face the increasingly severe thermal management test . In order to reduce the thermal resistance of the LED heat sink, the heat dissipation must be optimized from chip level , package level , heat dissipation substrate level , system level , and thermal design to each link . Get the best heat dissipation . Define the entire high-power LED component temperature and use Equation 1 to calculate the total thermal resistance of the LED . Among them , Rj-a is the thermal resistance (K/W ) between the chip and the air . The thermal resistance of this part are caused by the chip and the package , which belongs to the epitaxial factory and the packaging manufacturer . Rsp-h is the thermal resistance (K/W ) between the heat sink substrate and the heat sink ; Rh-a is the thermal resistance (K/W ) between the heat sink and the air end , and Rsp-h and Rh-a are light fixtures . The area where the system supplier is responsible , the following will discuss the cool strategy for each key component .