Overview
IEC TR 62905:2018 is a Technical Report that provides guidance on exposure assessment for Wireless Power Transfer (WPT) systems operating at frequencies up to 10 MHz. The report addresses both thermal and stimulus effects and illustrates assessment procedures with experimental and numerical examples - notably for electric vehicles (EVs) and mobile devices. IEC TR 62905 is intended as a practical reference for evaluating human exposure around WPT installations.
Key Topics and Requirements
The report organizes practical assessment methods and supporting material, including:
- Scope and terminology: definitions, symbols and physical quantities relevant to WPT exposure.
- Classification of WPT systems:
- systems below 100 kHz
- systems between 100 kHz and 10 MHz
- Basic assessment methods:
- Procedures for evaluating direct effects (induced fields, SAR, induced E‑field)
- Procedures for evaluating indirect effects (contact currents, interactions with objects and implants)
- Flowcharts for assessment decision-making
- Measurement and calculation techniques:
- Measurement of incident electric and magnetic fields (equipment and method guidance)
- Coupling factor and generic gradient source models
- Procedures for induced E‑field and SAR estimation (measurement and numerical calculation)
- Contact current measurement equipment and methods
- Informative annexes with worked examples:
- Case studies for EV charging pads and mobile-device chargers
- Numerical and experimental studies, coupling-factor evaluations
- Considerations for medical implants and implant enhancement factors
- Reference to international exposure guidelines (Annex B), including ICNIRP and IEEE guidance.
Practical Applications and Who Uses This Standard
IEC TR 62905 is useful for professionals involved with the design, testing and safety evaluation of WPT systems:
- WPT system designers and RF engineers (EV charging infrastructure, consumer wireless chargers)
- Compliance and test laboratories performing human exposure measurements
- Health & safety officers and regulatory bodies assessing compliance with exposure limits
- Researchers conducting numerical modelling and experimental exposure studies
- Manufacturers preparing technical documentation for product certification
The report helps these users determine when field measurements, numerical modelling or contact-current testing are required, and provides example procedures for realistic exposure scenarios.
Related Standards
- ICNIRP exposure guidelines and IEEE exposure standards (summarized in Annex B)
- IEC measurement-related standards referenced in the normative clauses (see TR for full list)
IEC TR 62905:2018 is a practical, example-rich resource for assessing human exposure from WPT systems and supports harmonized, safety-focused deployment of wireless power technologies.