Application of Silicone Thermal Pads in Wireless Charging Mat

silicone thermal pads in wireless charging pad

New electronic products, especially portable electronic products such as digital cameras, mobile phones, and tablet computers, are used more and more in people's work and life, and the matching chargers also use traditional wired chargers. However, the compatibility and versatility of wired chargers are relatively poor, and it is inconvenient for users to carry and charge them. At the same time, post-disposal treatment increases environmental pollution. It is imminent to provide users with more reliable, convenient, convenient and timely charging equipment. The development of wireless charging technology makes the transmission of wireless charging power possible, and the research and development of wireless chargers will also meet the requirements of users.

In order to enable different brands of products to share the same wireless charger and improve the versatility of wireless chargers, the world's first standardization organization to promote wireless charging technology - Wireless Power Consortium launched the "wireless charging" standard, Wireless Power Consortium (WPC ) standard, the power consumption of wireless transmission is only 0~5W. Systems meeting this standard range use inductive coupling between 2 planar coils to transfer power from a power transmitter to a power receiver. The distance between the primary and secondary coils is typically 5mm, and output voltage regulation is handled by a global digital control loop, where the power receiver communicates with the power transmitter and generates power consumption. Due to the small size of the wireless charger, the working temperature of the electronic components inside the wireless charger must be solved first.

Xiaomi multi-coil wireless charging wireless charging mat adopts a 19-coil design to achieve the effect of free placement and charging at will. Xiaomi multi-coil wireless charging board is designed to be very thin, with a thickness of only 16.04mm. It can provide 20W charging for a single mobile device, and can charge 3 mobile devices at the same time. Many people are worried about heat dissipation. Will the charging board be too thick and too noisy because of the fan? In fact, Xiaomi multi-coil wireless charging board adopts a fanless design, and the working temperature is only: 0°C~35°C. It is very quiet, and the fanless design makes it very suitable for staying at the bedside. It is fine on it, and will not affect the rest due to noise, which is very popular among users

Xiaomi multi-coil wireless charging wireless charging mat has as many as 19 built-in wireless charging coils, and the problem of natural heating cannot be ignored. In addition to making the product more stable in use, the use of an aluminum alloy bottom case is also to help dissipate heat. At the same time, the charging head net was disassembled and found that the front and back of the wireless charging module were respectively pasted with a graphite heat dissipation film and a thermally conductive silicone pad, and the thermally conductive silicone pad was attached to the aluminum alloy shell for heat conduction. In addition, there is a soaking aluminum plate between the circuit board and the magnetic sheet, and the overall heat dissipation measures are very good.

Since the bottom case is connected to the wireless charging circuit board, all components are concentrated on one side of the PCB, and the circuit board is an irregular whole, which cannot be directly seamlessly connected with the bottom case. The silicone thermal pads fill the gap between the wireless charging wireless charging mat bottom case and the circuit board, allowing the heat from the circuit board to guide the bottom case to dissipate heat more efficiently, and it can also play the role of electromagnetic shielding.

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Updated on:2023-07-10 10:54:29
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