Can the heat dissipation problem of led street lights be solved?

For LED street lights transformed from traditional lamps, even if the aluminum profile is used as the radiator, the entire light source and driving circuit are installed in the aluminum alloy lamp shell. Even if the protection level of the lamp is dealt with, the entire light source is in a closed lamp shell. The heat generated during operation cannot be dissipated into the air, causing the LED module and drive circuit to operate in a harsh environment. The operating temperature rises sharply, and the LED shows light decay and even damage as the temperature rises, and the driver is also due to excessive temperature. The damage reduces the reliability and service life of the LED lamps.

The heat dissipation and protection of LED street lamps is an industry-specific problem. System optimization planning should be carried out in material selection and structural planning to deal with the contradiction between the heat dissipation of LED lamps and product protection.

The influence of heat dissipation planning on LED life. Because the output light beam of a single LED is low at this stage, for general lighting applications, many LED components that are required are placed in a module to achieve the required illuminance. Since the photoelectric conversion power of LED is only 15%-20%, the rest is converted into heat energy. Therefore, when many LEDs are integrated into a module, it will increase the difficulty of heat dissipation. The problem is that this heat will cause the temperature of the LED module to rise, because an increase in temperature will cause the operating voltage of the LED to decrease, the light intensity to decrease, and the light wavelength to become longer.

It also affects the power of the LED driver, endangers the life of the magnetic components and output capacitors, etc., reduces the reliability of the LED driver, severely reduces the life of the LED, and accelerates the light decay of the LED.

When planning LED street lights, good heat dissipation planning is mainly based on the following considerations:

1, advance the luminous power of the LED, advance the current (power), and decrease the junction temperature of the LED chip (positive).

2, LEDs with high optical performance and high reliability depend on the junction temperature of the LED chip (Tj,.

Therefore, a good thermal planning is to manage the LED junction temperature, and the main ways of heat dissipation are conduction, convection, and divergence. Meanwhile, conduction and convection are more important for LED heat dissipation, while divergence is not important.