Explosion-proof flashlights, especially high-power multi-lamp head LEDs, will feel the head hot for about five minutes when turned on, which is the commonality of most explosion-proof lamps on the market. We know that when the LED explosion-proof flashlight is in a high temperature state for a long time, the LED PN junction temperature is too high, which directly leads to a sharp decline in LED light decay and the early end of the explosion-proof flashlight life. Therefore, the importance of solving the LED high-power explosion-proof flashlight heat dissipation is self-evident.
The cause of heating of high-power LED explosion-proof searchlights.
The high-power portable explosion-proof searchlight using semiconductor chip LED diode light-emitting technology is only about 30% due to the LED electro-optical efficiency. That is to say, about 70% of the electrical energy of high-power LED explosion-proof flashlight is converted into thermal energy and released through heat conduction. This is the root cause of the heat generation of LED explosion-proof strong light searchlights (subject to current semiconductor light-emitting technology). At present, in a short period of time, it is impossible to improve the electro-optical efficiency of the LED light source, and the explosion-proof searchlight manufacturer must solve the heat dissipation problem of the explosion-proof flashlight or searchlight of many LED lamp beads.
TANK007 Portable explosion-proof searchlight manufacturers how to solve the explosion-proof flashlight heat dissipation problem?
1. The use of efficient heat dissipation materials
For flashlights with low sealing requirements, thermal conductive materials such as aluminum or copper heat sinks with fins are used to convect with the outside air environment. For the explosion-proof searchlight flashlight with high sealing performance requirements, it is necessary to work hard from the internal electrical layout to the heat dissipation space of the lamp cavity, and the selection of imported aluminum can accelerate the conduction of heat.
2. Control the heat dissipation area
The 1W LED bead is recommended to have a heat sink area of not less than 50 square centimeters. The area of LED heat sink above 3W is not less than 150 square centimeters. According to the test results of tank007 explosion-proof flashlight engineers, the heat sink temperature is recommended not to exceed 60 ° C.
3. Use thermal grease
Whether the connection between the flashlight LED substrate and the heat sink is good is related to the quality of the heat dissipation effect. To ensure that the two contact surfaces are in good contact, we are in
Apply thermal grease between the bottom of the LED substrate and the heat sink to help the heat transfer of the LED aluminum substrate and the heat sink, just like the thermal grease between the computer CPU and the cooling fan.