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eLibrary > PD IEC TR 63377:2022 Procedures for the assessment of human exposure to electromagnetic fields from radiative wireless power transfer systems. Measurement and computational methods (frequency range of 30 MHz to 300 GHz) >

PD IEC TR 63377:2022 Procedures for the assessment of human exposure to electromagnetic fields from radiative wireless power transfer systems. Measurement and computational methods (frequency range of 30 MHz to 300 GHz), 2022

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PD IEC TR 63377:2022 Procedures for the assessment of human exposure to electromagnetic fields from radiative wireless power transfer systems. Measurement and computational methods (frequency range of 30 MHz to 300 GHz), 2022

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CONTENTS
FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms [Go to Page]
4.1 Physical quantities
4.2 Constants
4.3 Abbreviated terms
5 Description of radiative wireless power transfer systems [Go to Page]
5.1 General
5.2 Radiative WPT systems technology and applications [Go to Page]
5.2.1 General
Tables [Go to Page]
Table 1 – Representative characteristics of potential radiative WPT applications
Figures [Go to Page]
Figure 1 – WPT system classification via radio-frequency beam technologies [Go to Page]
5.2.2 Operating principle of space diversity WPT
Figure 2 – Beam pattern diagram of omnidirectional radiative WPT
Figure 3 – Beam pattern diagram of space diversity WPT [Go to Page]
5.2.3 Operating principle of narrow-beam WPT
5.3 Use cases and environment [Go to Page]
5.3.1 General
5.3.2 Indoor, occupational environment
Figure 4 – Beam pattern diagram of narrow-beam radiative WPT
Figure 5 – Example of indoor and occupational environments: WPT to production equipment sensors in factory
Figure 6 – Example of indoor and occupational environments:WPT to machine and line management sensors [Go to Page]
5.3.3 Indoor, general-public environment
5.3.4 Outdoor, occupational environment
Figure 7 – WPT to children watching sensors
Figure 8 – WPT to watching sensors in nursing homes [Go to Page]
5.3.5 Outdoor, general-public environment
6 General exposure assessment considerations [Go to Page]
6.1 General
6.2 Preparation of assessment [Go to Page]
6.2.1 General
6.2.2 Determination of key parameters
Figure 9 – Assessment process for radiative WPT [Go to Page]
6.2.3 Determination of applicable limits
6.2.4 Determination of assessment method
Table 2 – Whole-body SAR exclusions based on RF power levels
6.3 Assessment conditions
6.4 Uncertainty
Table 3 – Template of measurement uncertainty budget for assessment of the psSAR for frequencies from 30 MHz to 6 GHz
Table 4 – Template of measurement uncertainty budget for assessment of the incident power density for frequencies above 6 GHz
Annex A (informative)Coupling factors and correction factors [Go to Page]
A.1 General
A.2 Coupling factors for near-field exposure [Go to Page]
A.2.1 Characteristics of the near-field
A.2.2 Coupling of electromagnetic energy in the near-field
A.2.3 Considerations for whole-body exposure in the near-field
A.2.4 Derivation of the coupling factors for E-field or H-field exposure
A.3 Correction factors for far-field exposures [Go to Page]
A.3.1 Characteristics of the far-field
A.3.2 Tissue layering
A.3.3 Whole-body absorption and resonance
A.3.4 Conservative correction factors
Table A.1 – Summary of correction factors accounting for tissue layering effects specified in IEC 62232:2017 [12] for psSAR and wbSAR
A.4 Assessment of correction factors for layered tissues [Go to Page]
A.4.1 General
A.4.2 Correction factors for peak-spatial average SAR
A.4.3 Correction factors for whole-body SAR
A.4.4 Correction factors for partial body exposures
A.4.5 Correction of SAR results in homogeneous flat phantoms
Annex B (informative) Assessment procedure [Go to Page]
B.1 RF field strength and power density assessment for radiative WPT systems
B.2 Local SAR assessment for radiative WPT systems operating between 30 MHz to 6 GHz [Go to Page]
B.2.1 General
B.2.2 Preparation of the device under test
B.2.3 Transmitter SAR assessment procedure
Figure B.1 – Flowchart for the SAR assessment procedurebetween 30 MHz to 6 GHz [Go to Page]
B.2.4 Validation of the SAR assessment
B.3 Incident power density (PD) assessment for local exposure over 6 GHz [Go to Page]
B.3.1 General
B.3.2 Preparation of the device under test
B.3.3 PD assessment procedure – Experimental only
B.3.4 PD assessment procedure – Combined numerical and experimental methods
Figure B.2 – Description of PD assessment procedure between 6 GHz to 300 GHz [Go to Page]
B.3.5 Validation of the assessment
Annex C (informative)Description and validation of exposure mitigation techniques [Go to Page]
C.1 General
C.2 Description of the technology and its implementation
C.3 Validation of proximity sensors
C.4 Validation of time-period power control
C.5 System level validation of the exposure mitigation techniques
Annex D (informative) Computational methods [Go to Page]
D.1 Methods and procedures
D.2 Verification of the computational method
D.3 Application of hybrid computational and experimental methods
D.4 Considerations for the assessment of the numerical uncertainty [Go to Page]
D.4.1 General
D.4.2 Parameters for the numerical uncertainty assessment
Annex E (informative) Examples of exposure assessment [Go to Page]
E.1 Example of the dosimetric assessment of a WPT transmitter operating at 900 MHz [Go to Page]
E.1.1 Overview
E.1.2 Method
E.1.3 Model development and validation
E.1.4 Dosimetric assessment of the anatomical models
E.1.5 Results and conclusions
E.2 Example E-field assessment of RF WPT system operating at 2,45 GHz [Go to Page]
E.2.1 General
Figure E.1 – Anatomical model of the five-year-old girl exposed to theWPT transmitter E-field at a distance of 400 mm. The beam of the WPT system is focused at this distance. [Go to Page]
E.2.2 Assessment procedure
Figure E.2 – E-field measurement setup of RF WPT system [Go to Page]
E.2.3 E-field assessment results
Figure E.3 – E-field measurement scenario and positioning of WPT source (transmitter), client, and scan areas
Figure E.4 – E-field distribution measured at the distance 20 cm from RF WPT transmitter
Figure E.5 – E-field distribution measured in the far-field zone of WPT source: a) at the distance 2 m from RF WPT transmitter – in front of the client b) at the distance 2,75 m from RF WPT transmitter – behind the client
Figure E.6 – E-field measurement scenario with the cylindrical phantom
Figure E.7 – E-field measurement setup of RF WPT system with cylindrical phantom
Figure E.8 – E-field distribution for the case of partial obstruction by the phantom: a) 14 cm and b) 8 cm distance from phantom outer surface to transmitter-client line
Figure E.9 – E-field distribution measured in the horizontal plane within the distances 45 cm to 145 cm from transmitter antenna for the case of strong obstruction by the phantom. The position of cylindrical phantom with respect to scan area is shown.
Figure E.10 – E-field distribution measured at the distance 2,75 m from RF WPT transmitter when cylindrical phantom is placed behind the client (case 3 in Figure E.6). Field scan is performed between the client and phantom.
Bibliography [Go to Page]

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PD IEC TR 63377:2022 Procedures for the assessment of human exposure to electromagnetic fields from radiative wireless power transfer systems. Measurement and computational methods (frequency range of 30 MHz to 300 GHz), 2022

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