Metal Foreign Object Safety (FOD)
Release Time:
2024-06-18
At present, the frequency of energy transmission in high-power wireless charging solutions is generally in the range of tens of KHz to hundreds of KHz. This frequency range has eddy current heating effects on common metals. It is more vivid to use a product to explain it, which is an "induction cooker". However, wireless charging technology pursues efficient energy transfer rather than eddy current heating. If there are metal foreign objects present in the wireless charging area, they will be continuously heated due to eddy current effects, which poses a potential risk of damaging equipment and even causing fires. Therefore, wireless charging solutions should avoid eddy current effects in industry applications, in order to improve transmission efficiency and safety.
At present, the frequency of energy transmission in high-power wireless charging solutions is generally in the range of tens of KHz to hundreds of KHz. This frequency range has eddy current heating effects on common metals. It is more vivid to use a product to explain it, which is an "induction cooker". However, wireless charging technology pursues efficient energy transfer rather than eddy current heating. If there are metal foreign objects present in the wireless charging area, they will be continuously heated due to eddy current effects, which poses a potential risk of damaging equipment and even causing fires. Therefore, wireless charging solutions should avoid eddy current effects in industry applications, in order to improve transmission efficiency and safety.
At present, discussions on charging efficiency, size, charging distance, certification, and other aspects are common in the wireless charging industry, but these are only the basic requirements for scheme application. Many solution providers are hesitant about a professional term, which is "FOD". The full name of FOD is "Foreign Object Detection", which means "foreign object detection".
FOD technology has been widely used in wireless charging solutions for mobile phones due to its low power and short charging distance, making it easy to implement. However, in high-power industries with power levels of over 100 watts or even kilowatts, most wireless charging solutions on the market currently do not have complete FOD protection functions, and various brand solution providers avoid mentioning this term in the market promotion process. In high-power wireless charging solutions, the high sensitivity FOD function has a high technical barrier and requires deep technical accumulation and precise software algorithms. The magnetic trace technology wireless charging solution is designed for coins of different sizes and charging distances, and has high sensitivity FOD metal foreign object detection and protection functions in both power on standby and working modes. This can effectively avoid safety hazards caused by metal foreign objects mixed in during wireless charging in practical applications.
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