scope:

This standard includes procedures for evaluating the compliance of wireless power transfer (WPT) equipment with applicable electromagnetic compatibility (EMC) requirements. Test procedures for radiated field strength and conducted disturbance measurements are included, with reference to established standards, where applicable. WPT RF exposure compliance procedures are not included. This document covers measurement methodologies but is not intended to specify regulatory limits.

This standard does not consider test methods for the transmitter or receiver portion of any radio apparatus subcomponents that might be included in the equipment under test (EUT), other than those operating at the WPT frequency (or frequencies). These non-WPT radio subcomponents, which can be related or not to the WPT function of the EUT, are covered by other standards (e.g., ANSI C63.10 [B1] and ANSI C63.26 [B2]).

Measurement methods are included for radiated and alternating current (ac) mains power-line conducted emissions that can be generated by a variety of WPT devices, as described in 1.2. For correctly measuring such emissions, this standard prescribes a sequence of three procedures: frequency identification (for determining the EUT emission frequencies), exploratory measurements (for determining the set of conditions under which the EUT generates the highest emission relative to the applicable limit), and maximization (manipulation and operation of test instrumentation for determining the level of the highest emission from the EUT). These three processes are defined in 3.1.

Definitions are provided for terms and phrases contained in the text, in which the words do not represent obvious or common usage. Additional definitions are provided when multiple WPT organizations use different terms to describe the same component or subsystem of a WPT device. In most cases, measurement instrumentation and calibration requirements are only generally characterized in deference to standards dedicated to these subjects, which should be used in conjunction with this standard. The requirements for operation of test samples during measurements are presented for devices in general, as well as for specific types of devices that are frequently measured, with special attention given to application-level variations due to variables such as size, implementation, power level, and power transmission distance. Specific requirements for emission test data recording and reporting are also included. The main text is augmented by a series of annexes that provide other useful information or normative requirements.

In this document, the associated figures are placed at the end of each clause.

The methods in this standard are intended for measuring emissions from the equipment under test in the 9 kHz to 40 GHz frequency range.

Purpose and applications

This standard specifies the methods of measurement to be used for evaluating compliance with the applicable radiated and ac mains power-line conducted emissions requirements for WPT devices that are either already in wide use or soon to be introduced on the market, at the time of publishing this first edition of ANSI C63.30 (such as Qi, PMA, A4WP², and SAE³ J2954 [B26]compliant models - see Annex A). This document includes procedures developed from an exhaustive investigation of such devices, inclusive of field propagation properties, simulation-based analysis, and test site dynamics (see Annex B).

Emission limit requirements shall be obtained from the applicable voluntary or regulatory sources.

Not all clauses in this standard are applicable to all devices that are subject to this standard. The nature of this standard is to specify general methods that shall be applied to all devices in its scope and to supplement these methods with particular requirements for some types of devices. Device-particular requirements take precedence over general requirements.

This edition of ANSI C63.30 applies to WPT equipment where the separation distance between the source and the client devices is of maximum 50 cm.

NOTE-WPT equipment covered by this first edition of ANSI C63.30 include, but is not limited to:

- Small, low-power devices such as WPT chargers (WPT source) for cellular phone or information technology equipment (e.g., laptop, tablet, wireless mouse, wireless keyboard) and the WPT client subassembly incorporated in the corresponding client device;

- Medium-power devices such as WPT chargers (WPT source) for kitchen appliances; other types of household, commercial, or industrial appliances (e.g., lawn mower, snow blower, vacuum cleaner); medical equipment; and the WPT client subassembly incorporated in the corresponding client device;

- High-power WPT equipment such as for electric vehicles or automated guided vehicles (automated in-plant transportation systems).⁴

As new WPT technologies mature, this standard will need to be revised or a follow-up amendment will need to be developed to include them.

Induction cooking appliances, such as those regulated under 47 CFR §18.305, are not within the scope of this standard.⁵

A voluntary or regulatory requirement should specify the following information in conjunction with the application of this standard:

a) Limits and frequency ranges for both ac mains power-line conducted and radiated emission measurements, together with detector function to be used for each limit (e.g., positive peak, quasi-peak, or linear average);

b) Resolution bandwidth setting to be used on the measuring instrument, for each test case, limit, and frequency range, if different from the bandwidth settings specified in this standard;

c) Measurement antenna distance for radiated emission measurements, for each applicable frequency range and for each applicable limit;

d) Extrapolation factor to be used when the limit is specified for a distance that is not practical for measurement, if different from the requirements in 9.3;

e) Identification of any uncommon requirements or of any requirements that differ from those specified herein;

f) Any requirement concerning statements of uncertainty of the measurement results (see ISO/IEC 17025:2017⁶), if different from those in 1.5 (see also 11.3.7.2).

² Qi technology is developed by the Wireless Power Consortium. PMA (Power Matters Alliance) and A4WP (Alliance for Wireless Power) technologies are developed by the AirFuel Alliance.

³ SAE publications are available from the Society of Automotive Engineers.

⁴ Notes in text, tables, and figures are given for information only and do not contain requirements needed to implement the standard.

⁵ Measurement procedures for induction cooking appliances are specified by the regulatory authority or purchasing agency; usually, these are the general measurement procedures applicable to industrial, scientific, and medical (ISM) equipment, other than WPT.

⁶ Information on references can be found in Clause 2.