The development of the lamp heatsink, details the types of LED lamp heatsink

As we all know, LED (Light Emitting Diode), light emitting diode, is a solid-state semiconductor device that can directly convert electrical energy into light energy. The heart of the LED is a semiconductor chip, one end of the chip is attached to a bracket, is the negative electrode, the other end is connected to the positive electrode of the power supply, the entire chip is encapsulated by epoxy resin.

A semiconductor chip consists of two parts, one is a P-type semiconductor, in which holes dominate, and the other is an N-type semiconductor, on which are mainly electrons. But when the two semiconductors are connected, a "P-N junction" is formed between them. When the current is applied to the chip through the wire, the electrons are pushed to the P region, where the electrons are combined with the holes, and then the energy is emitted in the form of photons, which is the principle of LED light. The wavelength of light determines the color of light, which is determined by the material forming the P-N junction.

In the process of converting electrical energy into light energy, when the current flows through the LED components, the temperature of the PN junction will rise, forming the so-called luminous heat, that is, the higher the current, the higher the temperature, the higher the brightness of the light, many people may say here, since this is the case, why do you want to control the temperature of the LED?

To understand this problem, let's first look at how high temperatures can affect LED and LED lamps.

The effect of temperature on LED

①LED is mainly composed of support, silver glue, wafer, gold wire (copper wire), epoxy resin, which in addition to support and epoxy resin, the other three kinds of material damage can directly lead to LED stop working, and too high temperature, just is the above three kinds of materials, in a high temperature environment LED light decay will increase, reduce the service life of LED, More can even burn the gold wire (copper wire) in an instant, leading to direct damage to the LED.

(2) Single LED can not directly meet the needs of use, often accompanied by LED power supply (drive), the power supply itself is a heating body, it has its own temperature requirements, if the temperature is too high, it will cause power failure or even damage, resulting in LED lamps can not work normally.

Therefore, it is urgent to solve the temperature problem of LED and LED lamps, that is, heat dissipation.

Principle of heat dissipation

Heat dissipation in the traditional sense is the so-called transfer of heat, and the principle of heat transfer has the following three points:

1 conduction

As we all know, heat can be conducted through the medium, it can be transferred from the temperature is too high to the temperature is too low, in this case, then the conductivity of the material, the thermal resistance caused by the structure of the heat dissipator and the shape and size may interfere with the heat conduction.

2 radiation

High school physics teachers tell us that heat is going up, in fact, this is the so-called radiation, it is very limited to the surrounding environment and the material of the radiation body itself.

3 Convection

People who buy buildings should have heard the concept of a floor, sales will generally say that such a building is very cool, indeed, the so-called convection is through the flow of gas or liquid to heat, its heat dissipation speed generally depends on the speed of the flow, if you want to achieve on the lamp body is difficult (consider waterproof, safety and other factors), However, it is not without specific reference to the products shown below.

The above three points of heat dissipation, now the most used in lamps is heat conduction, and this is also the topic we focus on today.

Heat conduction

Friends who read the above text should notice that there are three points that affect heat conduction, material, structure and size.