How does the power module dissipate heat?

  The power module will slowly get hot after using for a long time, which is a problem that troubles many users. If it is ignored for a long time, it may also affect the service life of the power module.

  Therefore, attention should be paid to the heat dissipation of the power module in the design. How can the heat dissipation not damage the power supply, but also maintain its stable operation?

How to design a thermal solution for power modules?

1. Convective ventilation of the power module.

For power sources that rely on natural convection and heat radiation for heat dissipation, the surrounding environment must be convenient for convective ventilation, and there is no large equipment around to facilitate air circulation.

2. Place the heating device.

If there are multiple heating sources in the system, such as multiple module power supplies, they should be kept as far away from each other as possible to avoid overheating due to heat radiative transfer between them.

3, PCB board design is reasonable, PCB board provides a way of heat dissipation, should be more considered in the design of heat dissipation.

For example, increase the copper area of the main circuit, reduce the density of components on the printed circuit board, and improve the heat dissipation area and channel of the module.

4. For a power supply with the same power and large package size and heat dissipation area, if possible, select a heat sink with a larger package and heat dissipation area, or use a heat dissipation paste to connect the case of the power module to the chassis.

In this way, the module has a larger heat dissipation area, faster heat dissipation, lower internal temperature, and higher power reliability.

5, matching design, safety design, power input wiring should be kept as straight as possible, so as not to form a ring antenna to attract external radiation interference.

At the same time, according to the safety requirements of the UL60950, the input and output lines should be kept at an appropriate distance to avoid voltage failure.

In addition, do not wire under the base plate of the power supply, especially the signal line, because the electromagnetic wire of the power transformer will interfere with the signal.

Attention should be paid to the frequency doubling stagger between the primary power supply and the secondary power supply and between the power supply and the system operating frequency to avoid the system matching problem between them.

In general, design is on the one hand, we should also pay attention to some problems in the application, only design and application better combined, then can better meet the needs of users, in order to be more popular in the market.