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Wireless Power Transfer (WPT) is the technology behind Wireless Charging Bases and Wireless Charging Devices and is changing the way we think about smart products.  

Designers everywhere are exploring innovative new applications for the technology, from cell phones to electric vehicles. In the U.S. alone, the WPT market is expected to reach $9.4 billion by 2020, with much of the demand coming from industrial and healthcare related products. Across the globe, the consumer market will continue to drive demand for wireless charging.

Wireless Power Transfer uses magnetic resonance to provide a safe, flexible, and convenient option to electrically charge products.  

Product safety considerations are necessary as the basic function of these devices is the wireless transmission of energy between a wireless power source and a receiver, Because the devices are used in close contact to humans, they must adhere to FCC guidelines for RF exposure. Furthermore, since energy is transmitted, EMC compliance for wireless charging devices is crucial.

FCC guidelines for RF exposure

In the US any device intended for wireless power transfer requires FCC guidance for radio frequency exposure review. Low power devices may be exempt; however all equipment, including medical devices, implants, and electric automobiles must be considered on a case-by-case basis.

How to proceed with FCC approvals

In the U.S., product manufacturers must seek guidance from the FCC by .

See .

RF Exposure Guidelines in Canada

Canada has a different approach to RF exposure for WPT devices, dividing products and sub-components into three categories, Type 1, Type 2 and Type 3.

See

• Type 1: Does not transmit any intelligence and does not require certification
• Type 2: Category II Radio - includes modulation on WPT frequency but is certification exempt
• Type 3: Category I Radio - Requires certification

WPT devices must also comply with the . When assessing compliance all transmitters, including those not used for power transfer, must be at maximum power.

If you have questions about RF exposure or EMC compliance for your WPT devices, contact us today.