In contemporary life, mobile phones play an irreplaceable role in people's lives, and their functions are no longer limited to telephone communication and SMS sending and receiving. It can be said that mobile phones are gradually catching up with computers, and people cannot do without them all the time. Therefore, if a mobile phone runs out of battery, it must be charged. Have you mentioned the power adapter that exists for charging mobile phones?
Power adapter, also known as external power supply, is a voltage conversion device for small portable electronic devices and electronic appliances, commonly used in small electronic products such as mobile phones, LCD displays, and laptops. People are aware that when charging a mobile phone, in addition to the phone heating up, the power adapter also heats up. So what is the reason? Has anyone understood its principle?
In fact, the heating of power adapters and mobile phones is a normal phenomenon, because currently the conversion efficiency of power adapters can only reach about 75-85%. When power adapters convert voltage, a part of the energy is lost, and except for a small part that is lost in the form of waves, the rest is dissipated in the form of heat. Therefore, the greater the power of the power adapter, the more energy is lost, directly leading to an increase in the heat generation of the power adapter.
The housing of a power adapter is generally sealed with heat-resistant and fire-resistant plastic, and the heat inside is conducted and dissipated through the external plastic housing. It is well known that high temperatures can cause short circuits or even fires, so a complete heat dissipation system is now being built. Here is a recommended thermal conductive material - thermal conductive silicone sheet
Thermal conductive silicone pad is a gap filling thermal pad made of silicone resin as the substrate and added with temperature resistant and thermal conductive materials. It has high thermal conductivity, low interface thermal resistance, insulation, compressibility and other characteristics. Due to its soft hardness, it can realize small thermal resistance under low pressure, while eliminating air between contact surfaces and fully filling the rough surfaces between contact surfaces.
By attaching a thermal conductive silicone film between the heat dissipation source and its corresponding PCB board bottom and shell, the good filling effect of the thermal conductive silicone film can effectively transfer the heat from the heat source to the shell. Moreover, the thermal conductive silicone film has good compressibility and elasticity, which can serve as a good shock absorber pad.