Large-power light emitting diode (LED) active radiating device for car lamp

Abstract

The invention provides a large-power light emitting diode (LED) active radiating device for a car lamp. The large-power LED active radiating device is characterized in that a heat plate is tightly adhered to the end surface of a cold source for a semiconductor refrigerating plate; a large-power LED is arranged at the top of the heat plate; the upper end surface of a radiator is tightly adhered to the end surface of a heat source for the semiconductor refrigerating plate; the bottom of the radiator is connected with a fan, the heat plate and the semiconductor refrigerating plate are arranged on an installing seat, and a cover plate arranged on the installing seat covers the exposed part of the heat plate; the output end of a heat dissipation temperature sensor arranged on the radiator, the output end of a heat conduction temperature sensor arranged on the heat plate and the output ends of environment temperature sensors arranged inside and outside a lamp are respectively connected to the input end of a micro-processing controller; and the refrigerating power supply control end of the micro-processing controller is connected with the power supply of the semiconductor refrigerating plate, and a fan motor control end is connected with the power supply for a fan motor, and a light source driving end is connected with the power end of the large-power LED. The large-power LED active radiating device has the advantage that active heat dissipation is adopted, so that the operating temperature of the LED is stabilized and controlled below the environment temperature.

Description

technical field [0001] The invention relates to an active cooling device for high-power LEDs used in vehicle lights, and belongs to the technical field of heat dissipation for vehicle lighting fixtures. Background technique [0002] The widespread use of high-power LEDs in car lights has become a trend. It has incomparable advantages in the headlights of car lights. It has the characteristics of long service life, short reaction time, high luminous efficiency, and low calorific value. [0003] LED is a cold light source that emits light from semiconductor materials. Due to the limitations of current technology, it still needs to generate a certain amount of heat during its work. If this part of the heat cannot be dissipated in time, it will directly lead to a decrease in the luminous efficiency of semiconductor materials, and in severe cases it will be burned. LED light source; this situation is especially prominent in high-power LEDs. The operating temperature of currentl...

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Problems solved by technology

When the heat sink cannot dissipate the heat well, it will cause the temperature of the LED light source node to rise until the LED chip is burned. Therefore, when designing the heat sink, a larger margin should be considered, which increases the heat sink. cost and weight

[0004] At present, the heat dissipation of car lights is commonly used to dissipate heat by combining heat pipes and radiators, and through water cooling. They are all passive heat dissipation. Since the heat dissipation effect is greatly affected by the ambient temperature, the LED light source can only work above the ambient temperature. On the one hand, it seriously affects the service life and luminous efficiency of LEDs. At the same time, the lighting effect of car lights fluctuates. As the lights turn on, the lights will gradually dim, which will affect driving safety.

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