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IEC 15149-3-16: Management of Dynamic Wireless Power Transfer Systems – Technical Overview
Comprehensive requirements and compliance guidelines for wireless power transfer management in multiple-device and mobile environments
Scope and Field of Application
IEC 15149-3-16 defines a management framework for dynamic wireless power transfer (WPT) systems intended for mobile platforms such as electric vehicles (EVs), automated guided vehicles (AGVs), and consumer electronics operating in motion. This standard is part of the IEC 15149 series and specifies the requirements for power control, communication, and safety supervision when multiple receivers are present or when the receiver moves relative to the transmitter.
The standard covers three primary aspects:
- Communication protocol between the power transmitter and multiple receivers for real‑time power negotiation.
- Power control logic for adjusting transmitted power based on load, position, and coupling factor.
- Safety supervision to ensure human safety and equipment protection under dynamic conditions.
Key Scope Elements:
– Transmitter to receiver coexistence and prioritisation
– Handover of power when receivers enter/leave the charging zone
– Frequency management to avoid interference with other radio services
– Requirements for contactless identification and authentication of receivers
– Transmitter to receiver coexistence and prioritisation
– Handover of power when receivers enter/leave the charging zone
– Frequency management to avoid interference with other radio services
– Requirements for contactless identification and authentication of receivers
Technical Requirements
System Architecture and Communication
IEC 15149-3-16 mandates a master‑slave architecture where one transmitter (master) communicates with up to 32 receivers via an out‑of‑band narrowband link in the 6.78 MHz or 13.56 MHz ISM band. The communication must support a maximum latency of 5 ms for power adjustment commands and 20 ms for safety shutdown signals. Error detection is based on a 16‑bit CRC and mandatory acknowledgements.
Power Classes and Operational Modes
The standard defines five power classes for dynamic operation, as detailed in Table 1.
| Class | Max Transmitted Power (W) | Typical Application | Receiver Count | Coupling Range (mm) |
|---|---|---|---|---|
| A | 15 | Wearables, smartphones | 1–4 | 0–5 |
| B | 100 | Tablets, drones | 1–8 | 0–20 |
| C | 500 | Industrial AGVs, robots | 1–16 | 0–50 |
| D | 3500 | Electric scooters, light EVs | 1–4 | 0–100 |
| E | 11000 | Electric cars, buses | 1–2 | 0–200 |
Power Transfer Profiles
Each class supports three profiles:
- Profile 1 – Static: Fixed coupling, used for initial calibration.
- Profile 2 – Quasi‑dynamic: Slow movement (≤ 1 m/s), interpolation of power setpoint.
- Profile 3 – Dynamic: High‑speed (> 1 m/s) with predictive power adjustment based on position sensing.
Alert: For Profile 3, the transmitter must include a forward‑looking sensor (radar, lidar, or inductive loops) to anticipate receiver entry and adjust power ramp rates to avoid overshoot. Systems unable to meet the 5 ms communication latency must restrict operation to Profile 1 or 2.
Implementation Highlights
Interoperability with Existing Standards
IEC 15149-3-16 aligns with ISO 19363 (EV wireless charging communication) and IEC 63119 (resonance control). Implementations should integrate the SAE J2954 alignment procedure with the management layer defined in this standard. The protocol stack uses a simplified version of TLS 1.2 for secure session establishment, with a pre‑shared key seed burned into the receiver during manufacturing.
Redundancy and Failover
To ensure safety in dynamic environments, the standard requires a dual‑channel safety function: one channel via the out‑of‑band data link and a second via a dedicated narrowband FM signal at 1 MHz above the power frequency. When both channels indicate an abnormal condition (e.g., coupling loss > 30 %), the transmitter must reduce power to ≤ 10 % of rated power within 50 ms.
Tip: During design, allocate the safety channel to a separate microcontroller with independent clock source. This meets the IEC 61508 SIL 2 requirement often referenced by local regulations for automotive WPT.
Software Verification
The standard mandates that the firmware implementing the management layer pass conformance tests defined in Annex D (normative). These tests include worst‑case latency measurement under 32 concurrent receivers and power setpoint accuracy verification within ± 5 % of requested power. A compliance tool is available from the IEC online portal.
Compliance and Certification Notes
Testing Regime
IEC 15149-3-16 compliance is verified through three tiers:
- Protocol conformance: Automated test sequence using a reference transmitter simulator.
- Power performance: Dynamic load sweeps with a calibrated moving test bench.
- Safety validation: Fault injection (communication loss, foreign object ingress) with timing measurement.
Important: The standard requires that any receiver certified under a lower class (e.g., Class C) may operate under a higher‑class transmitter only if it passes the Profile 3 handover test with the specific transmitter model. Cross‑class compatibility is not generally assumed.
National Adoption
IEC 15149-3-16 is adopted identically in Canada as CAN/CSA‑ISO/IEC 15149‑3‑16:2024. Many other countries reference it in national grid codes for road tolling and EV incentives. Compliance with this standard is recommended for CE marking (Europe) and FCC Part 18 (USA) as supplemented by relevant national rules.
Documentation Requirements
Manufacturers must supply:
- A system description including operating scheme and power profile mapping
- Test report from an accredited laboratory
- Installation and maintenance guidelines for dynamic charging lanes
IEC 15149-3-16 is a cornerstone for safe and efficient wireless power transfer in motion. Adherence ensures interoperability, reduces electromagnetic interference, and builds public trust in dynamic charging infrastructure.
Frequently Asked Questions
Q: What is the main difference between IEC 15149-3-16 and the earlier static wireless charging standards (e.g., Qi)?
A: IEC 15149-3-16 is specifically designed for dynamic (in‑motion) power transfer. It includes predictive power control, fast handover protocols, and a dual‑channel safety system that are not present in static standards. The management layer can handle up to 32 moving receivers simultaneously.
A: IEC 15149-3-16 is specifically designed for dynamic (in‑motion) power transfer. It includes predictive power control, fast handover protocols, and a dual‑channel safety system that are not present in static standards. The management layer can handle up to 32 moving receivers simultaneously.
Q: Can a device compliant with IEC 15149-3-16 be used with a static wireless charger?
A: Yes, but only if the static charger also implements the communication protocol defined in this standard. Most static chargers follow IEC 15149‑1 profiles, so a device certified under Part 3‑16 may need a firmware fallback to operate in static mode. The standard provides a compatibility mode (Profile 1) for exactly this purpose.
A: Yes, but only if the static charger also implements the communication protocol defined in this standard. Most static chargers follow IEC 15149‑1 profiles, so a device certified under Part 3‑16 may need a firmware fallback to operate in static mode. The standard provides a compatibility mode (Profile 1) for exactly this purpose.
Q: Which frequency bands does the standard require for out‑of‑band communication?
A: The mandatory band is 6.78 MHz ± 15 kHz (ISM). Optionally, 13.56 MHz may be used if local regulations permit. The power transfer itself can use any frequency allowed by regional authorities, but the standard strongly recommends 85 kHz for EV applications to harmonise with SAE J2954.
A: The mandatory band is 6.78 MHz ± 15 kHz (ISM). Optionally, 13.56 MHz may be used if local regulations permit. The power transfer itself can use any frequency allowed by regional authorities, but the standard strongly recommends 85 kHz for EV applications to harmonise with SAE J2954.
Q: How is foreign object detection (FOD) handled in this standard?
A: IEC 15149-3-16 incorporates FOD as part of the safety supervision. The transmitter must measure the quality factor (Q) of the resonant circuit before and during power transfer. A drop of more than 10 % triggers a power reduction or shutdown, depending on the profile. Additionally, a separate metal object detection sub‑circuit is recommended for Classes D and E.
A: IEC 15149-3-16 incorporates FOD as part of the safety supervision. The transmitter must measure the quality factor (Q) of the resonant circuit before and during power transfer. A drop of more than 10 % triggers a power reduction or shutdown, depending on the profile. Additionally, a separate metal object detection sub‑circuit is recommended for Classes D and E.
© 2026 – Technical Documentation for IEC 15149-3-16. This article is for informational purposes and does not replace the official standard text.