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BSI PD IEC TR 63377:2022

BSI PD IEC TR 63377:2022

$198.66

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)

Published By Publication Date Number of Pages
BSI 2022 56
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PDF Catalog

PDF Pages PDF Title
2 undefined
4 CONTENTS
7 FOREWORD
9 INTRODUCTION
10 1 Scope
2 Normative references
3 Terms and definitions
12 4 Symbols and abbreviated terms
4.1 Physical quantities
13 4.2 Constants
4.3 Abbreviated terms
14 5 Description of radiative wireless power transfer systems
5.1 General
5.2 Radiative WPT systems technology and applications
5.2.1 General
15 Tables
Table 1 – Representative characteristics of potential radiative WPT applications
16 Figures
Figure 1 – WPT system classification via radio-frequency beam technologies
17 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
18 5.2.3 Operating principle of narrow-beam WPT
5.3 Use cases and environment
5.3.1 General
5.3.2 Indoor, occupational environment
Figure 4 – Beam pattern diagram of narrow-beam radiative WPT
19 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
20 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
21 5.3.5 Outdoor, general-public environment
6 General exposure assessment considerations
6.1 General
6.2 Preparation of assessment
6.2.1 General
6.2.2 Determination of key parameters
Figure 9 – Assessment process for radiative WPT
22 6.2.3 Determination of applicable limits
23 6.2.4 Determination of assessment method
24 Table 2 – Whole-body SAR exclusions based on RF power levels
25 6.3 Assessment conditions
6.4 Uncertainty
26 Table 3 – Template of measurement uncertainty budget for assessment of the psSAR for frequencies from 30 MHz to 6 GHz
27 Table 4 – Template of measurement uncertainty budget for assessment of the incident power density for frequencies above 6 GHz
28 Annex A (informative)Coupling factors and correction factors
A.1 General
29 A.2 Coupling factors for near-field exposure
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
30 A.3 Correction factors for far-field exposures
A.3.1 Characteristics of the far-field
A.3.2 Tissue layering
31 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
32 A.4 Assessment of correction factors for layered tissues
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
33 A.4.5 Correction of SAR results in homogeneous flat phantoms
34 Annex B (informative) Assessment procedure
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
B.2.1 General
35 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
36 B.2.4 Validation of the SAR assessment
B.3 Incident power density (PD) assessment for local exposure over 6 GHz
B.3.1 General
37 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
38 B.3.5 Validation of the assessment
39 Annex C (informative)Description and validation of exposure mitigation techniques
C.1 General
C.2 Description of the technology and its implementation
C.3 Validation of proximity sensors
40 C.4 Validation of time-period power control
C.5 System level validation of the exposure mitigation techniques
41 Annex D (informative) Computational methods
D.1 Methods and procedures
D.2 Verification of the computational method
42 D.3 Application of hybrid computational and experimental methods
D.4 Considerations for the assessment of the numerical uncertainty
D.4.1 General
D.4.2 Parameters for the numerical uncertainty assessment
43 Annex E (informative) Examples of exposure assessment
E.1 Example of the dosimetric assessment of a WPT transmitter operating at 900 MHz
E.1.1 Overview
E.1.2 Method
44 E.1.3 Model development and validation
E.1.4 Dosimetric assessment of the anatomical models
45 E.1.5 Results and conclusions
E.2 Example E-field assessment of RF WPT system operating at 2,45 GHz
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.
46 E.2.2 Assessment procedure
Figure E.2 – E-field measurement setup of RF WPT system
47 E.2.3 E-field assessment results
Figure E.3 – E-field measurement scenario and positioning of WPT source (transmitter), client, and scan areas
48 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
49 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
50 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
51 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.
52 Bibliography

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BSI PD IEC TR 63377:2022
$198.66