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Wireless Charging

Background

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. Since these devices are used in close contact to humans, they must adhere to FCC guidelines for RF exposure.  Currently, FCC does not have a specific ruling for QI wireless charger in USA.  Therefore, the standard KDB 680106 had been used as a guideline, which clarifies the technical requirement, test standard, RF Exposure requirement and approval considerations.

SGS Service

SGS EEC laboratory is one of the authorization laboratory of FCC, has rich experience on certification of wireless charger.  We have own TCB service and many TCB reviewers and certifiers in local to provide fast and convenient FCC certificate service.

Test Reference Standard:

  • Depending on the operating configurations, QI wireless charger may need to be approved under Part 15, Part 18 or both.

Operating Configurations 

Reference Standard

Remark

Wireless charger without data communication, but has limited communication for charge management  47 CFR Part 15  May not transmit in the  90-110kHz band 
Wireless charger without data communication, but has limited communication for charge management  47 CFR Part 18 
Wireless charger without data communication, but has limited communication for charge management with another frequency band used  47 CFR Part 15 & Part 18 
Wireless charger has data communication  47 CFR Part 15 & Part 18 
 

Remark:

  • Data communication indicate use for picture or audio information transmitted
  • Charge management indicate use for load management and power charge management etc
  • The charge management function can’t be considered as data communication
                                                                                                                                                                                                                                                           

RF Exposure Requirement:

  • For devices designed for typical desktop applications, RF exposure evaluation should be conducted assuming a user separation distance of 15 cm (for all simultaneous transmitting coils, 20 cm above the top surface is required). E and H field strength measurements should be tested for all sides and the top of the device with the 15cm measured from the centre of the probe to the edge of the device. Special for vehicle device, the measurement should be tested at 0, 2, 4, 6, 8, 10 cm
  • The test results are demonstrated to be less than 50% of the MPE limit (614V/m and 1.63A/m)
  • The similar statement should be provided to the end user on user manual: This equipment should be installed and operated with minimum distance 20cm between the radiator and your body

Equipment Approval Considerations:

Wireless charger meets all of the following requirements are not required to submit a KDB inquiry for devices approved using SDoC or a PAG for equipment approved using certification to address RF exposure compliance

  • Power transfer frequency is less than 1MHz
  • Output power from each primary coil is less than or equal to 15 watts
  • The transfer system includes only single primary and secondary coils. This includes charging systems that may have multiple primary coils and clients that are able to detect and allow coupling only between individual pairs of coils
  • Client device is placed directly in contact with the transmitter
  • Mobile exposure conditions only (portable exposure conditions are not covered by this exclusion)
  • The aggregate H-field strengths at 15 cm surrounding the device and 20 cm above the top surface from all simultaneous transmitting coils are demonstrated to be less than 50% of the MPE limit
  • Special for vehicle wireless charger, the KDB inquiry is required 

 

Independent and innovative, our Electrical & Electronics experts use state-of-the-art facilities and technology to deliver tailor made, value-added services that help improve your business.  Our expertise in compliance management will help you make the right choices for different national markets, while carrying out the necessary testing and certification quickly and professionally.

For more information, please contact our Customer Service Team!

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