Overview - IEC 63028:2017 (Wireless power transfer, AirFuel Resonant BSS)
IEC 63028:2017 specifies the technical requirements, behaviors and interfaces that ensure interoperability of flexibly coupled resonant wireless power transfer (WPT) systems based on the AirFuel Resonant Baseline System Specification (BSS v1.3). The standard defines system architecture, device types, power-transfer and control behaviors, signaling (including Bluetooth Low Energy profiles), and conformance/backwards compatibility provisions to enable reliable, interoperable charging between Power Transmitting Units (PTUs) and Power Receiving Units (PRUs).
Key topics and technical requirements
- System description and device classification: Defines PTU (transmitter) and PRU (receiver) types, categories and co‑existence considerations.
- Power transfer specifications: Equivalent circuits, resonator requirements, resonator coupling efficiency (RCE), load parameter limits and stability expectations.
- Power control and state models: PTU and PRU state machines (Power Save, Low Power, Power Transfer, Fault states), state transitions and power-sharing behavior.
- Signaling and communications: BLE requirements, GATT/WPT service characteristics, advertising payloads, security considerations and charge procedure flow - designed for robust discovery, negotiation and control.
- Test and conformance: Procedures for conformance, reference PRUs for PTU acceptance testing, and backwards compatibility rules.
- Informative annexes: User experience and indication requirements, lost-power handling, and RCE calculation methods (S-parameters and Z-parameters).
Practical applications and who uses this standard
IEC 63028:2017 is intended for organizations and professionals involved in the design, manufacture, testing, deployment and certification of resonant WPT systems, including:
- Consumer electronics and accessory manufacturers (wireless chargers, wearable chargers, mats)
- OEMs and system integrators embedding resonant charging into furniture or appliances
- IoT and industrial device designers seeking contactless power or battery-less sensor options
- Test laboratories and certification bodies validating interoperability, safety and performance
- Standards developers and system architects aligning product ecosystems to AirFuel Resonant specifications
Adopting IEC 63028 helps product teams ensure interoperable, reliable and user-friendly wireless charging solutions across vendors and device classes.
Related standards and references
- AirFuel Wireless Power Transfer System Baseline System Specification (BSS v1.3) - basis for IEC 63028
- Bluetooth Low Energy (BLE) profiles and GATT specifications - used for signaling and control
- Other IEC WPT standards and test methods for electromagnetic compatibility and safety
Keywords: IEC 63028:2017, wireless power transfer, AirFuel Resonant, BSS, WPT interoperability, PTU PRU, resonator coupling efficiency, Bluetooth Low Energy, wireless charging.