What are the requirements for potting glue for switching power supplies?

Switching power supplies, as a type of power converter, plays a crucial role in the use of modern electronic devices. In the design of switch mode power supplies, the use of potting glue can not only play a role in curing and bonding but also prevent the invasion of moisture and dust, improving the sealing and stability of the entire device. Therefore, selecting the right type of potting glue for switch mode power supplies is crucial for their working effectiveness and lifespan. So what are the requirements for sealing glue for switch mode power supplies?

The first requirement is the hardness of the potting glue. In the voltage control circuit of switch mode power supplies, some components with high hardness requirements will be used, such as oscillators, transformers, inductors, etc. If the hardness of the sealing adhesive is too high, it will reduce the oscillation frequency of these components, thereby affecting the output voltage and stability of the power supply. Therefore, the hardness of the sealing adhesive should be moderate, generally between 40-60A.

Secondly, there are temperature performance requirements for the potting glue. Switching power supplies generates a significant amount of heat during use, therefore, the temperature tolerance requirements for sealing adhesive are relatively high. Generally, the potting glue should be able to withstand high and low-temperature alternation within the range of -40 ℃ to+125 ℃ to ensure that the power supply can work normally in various environments.

In addition, there are requirements for the compression elasticity, bonding strength, and protective performance of the potting glue. For example, the bonding strength of the potting glue needs to reach a certain level to ensure that the components will not loosen or fall off under external forces such as vibration and impact. The waterproof, flame-retardant, and environmentally friendly properties of the potting glue also need to meet certain requirements to prevent damage to the components caused by pollutants, moisture, oxygen, and other factors.

In summary, potting glue plays a significant role in the design of switching power supplies, and its performance and quality requirements are correspondingly high. Only by selecting the appropriate sealing adhesive and strictly controlling the quality during the production process can the stability and long-term reliability of the switching power supply be guaranteed, providing guarantees for the sustainable development and application of modern electronic equipment. If you don't know how to choose, you can consult Schneider. We have professional engineers to provide you with one-on-one selection guidance and adhesive solutions.