The importance of heat dissipation in lighting lamps
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Update Time : 2023-03-26 10:40:32
Poor heat dissipation leads to LED driving power, electrolytic capacitors have become LED lighting further development of the short board, LED light source premature decline. Only by exporting the heat as soon as possible can we effectively reduce the cavity temperature of the LED lamp, to protect the power supply from working in a permanent high temperature environment, to avoid the premature aging of the LED light source due to long-term high temperature work.
Because the LED light source itself has no infrared, ultraviolet, so the LED light source itself has no radiation heat dissipation function, the heat dissipation way of the LED lighting lamps can only be exported through the radiator closely combined with the LED lamp bead board. The radiator must have the function of heat conduction, heat convection and heat radiation. Any radiator, in addition to the ability to quickly transfer heat from the source to the surface of the radiator, Z mainly depends on convection and radiation to dissipate heat into the air. Heat conduction only solves the way of heat transfer, and heat convection is the main function of the radiator, heat dissipation performance is mainly determined by the heat dissipation area, shape, the ability of natural convection intensity, heat radiation is only an auxiliary role. Generally speaking, if the heat from the heat source to the radiator surface distance is less than 5mm, so as long as the thermal conductivity of the material is greater than 5, the heat can be derived, the rest of the heat must be dominated by heat convection.
Most LED lighting sources still use low voltage (VF = 3.2V), high current (IF = 200-700mA) LED lamp beads, due to high heat at work, must use high thermal conductivity of aluminum alloy. Usually there are die cast aluminum radiator, extrusion aluminum radiator, stamping aluminum radiator. Die casting aluminum radiator is a kind of pressure casting parts technology, the liquid zinc copper aluminum alloy pouring into the inlet of die casting machine, die casting machine die casting, casting in advance design mold limited shape radiator.
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