Analysis of heat dissipation technology of high power LED lamps

First, discuss the external direct parameters of LED products:

The temperature difference is large, and the surface temperature of the radiator is high--good? Is this correct? This cannot be generalized. It is necessary to make a specific analysis of the specific situation to determine whether this statement is correct.

Cooling has two purposes:

(1) The heat of the heat source is transmitted to the environment, and the ambient temperature is raised when the environment is heated. Such as heating systems.

(2) Transfer the heat of the heat source to reduce the temperature of the heat source as much as possible. Heat Dissipation of High Power LED Lamps - This article is a descriptive discussion of the technical aspects of this product.

For energy supply systems, the surrounding environment needs to be heated to a sufficiently high temperature. The heat dissipation of LED high-power lamps and the purpose of heating and cooling are just a little reverse. It may not be easy for the reader to understand immediately. After understanding this article, you may understand the principle of the previous sentence.

The purpose of heat dissipation of LED high-power lamps is not to keep the temperature of the heat sink as the target, nor to heat the ambient temperature, but to reduce the temperature of the heat source. Because of the heat dissipation, the temperature of the heat source can be lowered, and the temperature of the heat sink is naturally not high. Good heat dissipation design, after heat balance, the temperature difference between the heat source and the heat sink is small, and the temperature difference between the heat sink and the surrounding air is also small.

In the relevant formula for one-sided heat dissipation, the amount of heat dissipation is proportional to the temperature or temperature difference, and the temperature of the heat sink is increased based on this. When the heat source power is constant, to increase the temperature of the heat sink, it is necessary to reduce the size or radiation capability of the heat sink. However, the temperature of the heat sink is increased, although the temperature difference between the heat sink member and the air is large, but the temperature difference between the heat source and the heat sink is reduced, and the loss of heat per unit area and heat dissipation is actually ignored. The result: the temperature of the heat sink rises and the temperature of the heat source rises accordingly. This does not meet the original intention of thermal design.

Three goals for cooling:

1, heat source, heat transfer per unit area.

2, speed up the heat dissipation, heat transfer per unit time.

3, in accordance with the first two conditions, too high temperature difference between the heat sink and the heat source is also not desirable, at the cost of the cost, so it is recommended that the draft power within the appropriate temperature range of 40-50 degrees, is desirable.