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Why do led rechargeable flashlight get hot?

Why do led rechargeable flashlight get hot?


Why do led rechargeable flashlight get hot?

LED flashlights convert electrical energy into light energy. Most of the conversion process converts electrical energy into thermal energy, and only a small part is converted into light energy. This process follows the law of conservation of energy. The led rechargeable flashlight generates heat when it is working, and the heat comes from the work of the LED.

The aluminum alloy led flashlight is cooled by the external heat. You can quickly feel the heat. The lamp holder and the outer casing of the led flashlight have a high thermal conductivity. The heat transfer is very fast and it is very good. This is a normal heat dissipation phenomenon.

The fever is related to the core of the led rechargeable flashlight.

The greater the power consumption, the more powerful the flashlight is. For example: The XML T6 core has a maximum power of 10W. If the heat is not enough, it is easy to cause the LED to age prematurely. Straw hat LED power is about 0.5W, no need for heat sinks.

The higher the level of the LED flashlight core, the higher the photoelectric conversion efficiency and the less heat loss. This process follows the law of conservation of energy.

The heat is related to the driving circuit of the led flashlight.

The drive circuit can be roughly divided into direct drive and constant current drive. The current of the direct drive circuit is not controlled. When the battery power is high enough, the battery will do its best to supply the LED. At the beginning, the flashlight will be bright, the temperature will rise suddenly, and the heat and heat will not be balanced. The brightness and temperature will slowly drop after the battery is gradually depleted. Due to the high current in the early stage, the damage to the LED and the battery is very large. The life of the LED often cannot reach the design life, and the battery will also be shortened due to the overloaded working life. This kind of “quick success” is not limited to the flow of the driver, only the low-end flashlight will see. In the early stage of the work of the flashlight, the effect will be slightly better, and it will weaken rapidly as time progresses.

The constant current driving circuit belongs to the current mainstream driving scheme. The circuit controls the current supplied to the LEDs to maintain the same current. For example, the XM-L T6 is driven by a constant current of 2.0A, and the brightness is always maintained at 742 lumens. After the current is constant, the heat and heat dissipation of the flashlight are also balanced, and the output current of the battery can be maintained. This is the optimal drive solution. Generally, a small volume of flashlight can be balanced in about 15 minutes. Brightness and illumination can be consistent.

The heat conduction is related to the lamp holder of the flashlight.

The larger the contact area between the lamp holder and the LED flashlight, the better the conduction effect. The higher the thermal conductivity of the material, the better the thermal conductivity. At present, the mainstream copper solid-soled led flashlight lamp holder can more quickly transfer the heat generated by the LED to the aluminum alloy to dissipate heat, and to avoid the heat accumulation and affect the life of the LED rechargeable flashlight. This structure is similar to the heat sink of a computer’s CPU. The plane that is in direct contact with the CPU is made of copper, and the heat sink is made of finned aluminum foil and fan.

The relationship between heat dissipation and the volume of led rechargeable flashlights.

The compact LED flashlight has a small surface area, and the relatively large volume of the rechargeable led flashlight will feel the field slightly different. Usually such flashlights do not use excessively powerful LEDs as the core source.

Well, the reason why do led rechargeable flashlights get hot, that is, because a large part of the electrical energy is converted into heat and heat, in fact, it is the same as the principle of car engine heating. This is a normal phenomenon. As long as it is a regular or somewhat famous flashlight manufacturer, it can be used with confidence. Because the LED flashlight manufacturer has passed many tests and passed the test successfully, some even passed Quality Certification.