Common thermal solution for wireless charger
Wireless charging technology breaks the traditional connection line charging. It is a wireless charging technology using intelligent power transmission, which improves the efficiency and convenience of charging; In recent years, mobile phone wireless charging has been widely recognized and its utilization rate is getting higher and higher. It once became a popular product in the mobile phone charging industry.
Wireless charging works through the principle of electromagnetic induction. Since it is a magnetic field cutting method, it will inevitably produce heat. Due to its small size, the working temperature of internal electronic components needs to be solved first. The heat will not only affect the efficiency of the wireless charger, but also transfer the heat to the mobile phone. In order to better thermal performance, the wireless charging shell needs to be made of metal rather than plastic as much as possible, and the heat conductive silicone gasket just provides its heat dissipation scheme to solve this problem.
In order to improve the heat dissipation efficiency, the metal material at the bottom of the wireless charger is generally integrated with a thermal conductive pad, which can not only lay a good foundation for the heat dissipation of internal electronic components, but also have the effect of anti-skid, shockproof and not easy to wear.
The integrated metal forming of the bottom shell of the product is also the key to heat dissipation. The use of metal is to better transmit the heat inside the product to the outside through the bottom shell, so that the internal working temperature can always be handled in a safe state, so as to delay the service life of the product.
Since the bottom shell is connected with a wireless charging circuit board, all components are concentrated on one side of the PCB, and the circuit board is an irregular whole, there is no way to directly and seamlessly connect with the bottom shell, so thermal PAD and conductive foam are pasted on the bottom shell to fill the gap between the bottom shell and the circuit board, The heat of the circuit board is guided to the bottom shell through the thermal PAD and conductive foam to dissipate heat, which can also play the role of electromagnetic shielding.
With the increase in the use rate of mobile phone wireless chargers, the power of wireless chargers also began to expand. As the power consumption of wireless charger increases and the volume shrinks, the problems of temperature control, heat dissipation and electromagnetic shielding of internal electronic components need to be solved.
