Wireless power transfer(WPT) Certification Introduction
Magnetic induction is a technology that you will probably remember from your physics classes at high school.
You need two coils, a transmitter coil and a receiver coil. An alternating current in the transmitter coil generates a magnetic field which induces a voltage in the receiver coil. This voltage can be used to power a mobile device or charge a battery.
The presentation below shows how to build a wireless charging system using magnetic induction.
You will see that products need more than coils and alternating currents. For energy-efficient power transfer the phone must be able to shut down the transmitter when the battery is full. The phone, therefore, needs to send control signals to the charging station.
It is under RED (Radio equipment directive) now with the standard of EN303417
Note: Wireless power transfer MUST have Radio Communication or Radio Determination, then can follow EN303 417. Otherwise, it should comply with EMCD if only the charging function.
Wireless power transfer (WPT) devices operating at frequencies above 9 kHz are intentional radiators and are subject to either Part 15 and/or Part 18 of the FCC rules. The specific applicable rule part depends on how the device operates, and if there is communication between the charger and device being charged.
Intentional radiators transmitting information must be certified under the appropriate Part 15 Rules and will generally require an equipment certification. A WPT device may operate in two different modes: charging and communications. It is possible for the device to be approved under Part 18 for the charging mode and Part 15 for the communications mode, if it can be shown that (1) the device complies with the relevant rule parts; and (2) the functions are independent. Part 18 consumer devices can be authorized using either certification or SDoC, once the appropriate RF exposure evaluation has been completed.
NTEK, with its headquarter in Shenzhen; it is a comprehensive third-party testing and certification body. Currently we have physical and chemical testing labs in Shenzhen, Dongguan, Shanghai and other places, and we have accredited the certifications by CNAS, CPSC, CMA and other authorities. We offer a full range of testing services which cover consumer products, jewelry, battery, food contact materials, automotive parts, automotive electronics, and electrical and electronic products, etc. We can help enterprises to complete the precise control of whole industry chain from raw materials to the finished products.
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