GB/T 38775.4-2020 PDF English
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GB/T 38775.4-2020: Electric Vehicle Wireless Power Transfer - Part 4: Limits and Test Methods of Electromagnetic Environment
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38775.4-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.99
K 81
Electric Vehicle Wireless Power Transfer - Part 4.
Limits and Test Methods of Electromagnetic
Environment
Issued on. APRIL 28, 2020
Implemented on. NOVEMBER 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 5
4 Overview... 7
5 Limits... 8
6 Test Methods... 11
7 Evaluation of Test Result... 20
Appendix A (informative) Test Record Form... 22
Bibliography... 26
Foreword
GB/T 38875 Electric Vehicle Wireless Power Transfer is divided into several parts as
follows.
---Part 1.General Requirements;
---Part 2.Communication Protocols between On-board Charger and Wireless
Power Transfer Device;
---Part 3.Specific Requirements;
---Part 4.Limits and Test Methods of Electromagnetic Environment.
This Part is Part 4 of GB/T 38775.
This Part was drafted in accordance with the rules in GB/T 1.1-2009.
This Part was proposed by and shall be under the jurisdiction of China Electricity
Council.
The drafting organizations of this Part. China Electric Power Research Institute; State
Grid Jiangsu Electric Power Company Limited; China Electricity Council; ZX
NECORPORATION; China Automotive Technology and Research Center Co., Ltd.;
Zhejiang VIE Science & Technology Co., Ltd.; Zongcharge Wireless Power Technology
Co., Ltd.; XJ Power Co., Ltd.; State Grid Jiangxi Electric Power Co., Ltd. Research
Institute; State Grid Hebei Electric Power Research Institute; State Grid Shanghai
Electric Power Research Institute; Shanghai Electrical Apparatus Research Institute
(Group) Co., Ltd.; NARI Group Corporation; SAIC MOTOR; Zhejiang GEELY Auto
Group; BAIC BJEV; Tsinghua University; TIANGONG University; Southeast University.
The main drafters of this Part. Li Ni, Wang Yanzhao, Liu Yongdong, Wan Baoquan, Ge
Dehui, Zhai Xuefeng, Zhang Jiangong, Wei Bin, Ma Jianwei, Wang Yang, Wang
Chengliang, Hu Chao, Wang Chuanqi, Zhong KAI, Wang Wenbin, Liu Xiangli, Chen
Feng, Xu Baohua, Xu Chong.
1 Scope
This Part of GB/T 38775 specifies limits and test methods of electromagnetic
environment inside and outside electric vehicles during wireless power transfer.
This Part is applicable to stationary magnetic coupling wireless power transfer system
of electric vehicles, with the maximum rated voltage of power supply of 1,000 V (AC)
or 1,500 V (DC); the maximum rated output voltage of 1,000 V (AC) or 1,500 V (DC);
primary devices shall adopt the mode of buried installation or above-ground installation.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 2900.60-2002 Electrotechnical Terminology - Electromagnetism
GB/T 12113-2003 Methods of Measurement of Touch Current and Protective
Conductor Current
GB/T 38775.1-2020 Electric Vehicle Wireless Power Transfer - Part 1.General
Requirements
GB/T 38775.3-2020 Electric Vehicle Wireless Power Transfer - Part 3.Specific
Requirements
3 Terms and Definitions
What is defined in GB/T 2900.60-2002 and GB/T 38775.1-2020, and the following
terms and definitions are applicable to this document.
3.1 Occupational Exposure
Occupational exposure refers to all electromagnetic field exposure that individuals are
subject to due to the engagement in fixed or designated occupational activities. Under
the conditions of receiving appropriate instructions and trainings, workers are already
informed, and voluntarily experience the effects of the electromagnetic fields.
3.3 Medical Exposure
Medical exposure refers to electromagnetic field exposure to patients undergoing
medical diagnosis or approved medical treatment, or volunteers in medical researches.
3.4 Active Implantable Medical Device
Active implantable medical device refers to active medical devices implanted in the
human body.
3.5 Touch Current
Touch current refers to the current flowing through the human body or animal when
they touch one of more accessible parts of devices or equipment.
3.6 Basic Restriction
Basic restriction refers to a limit determined for human tissue that may cause harmful
health effects. It strictly conforms to all the already-known biophysical interaction
mechanisms and is usually difficult to measure.
3.7 Reference Level
Reference level refers to a physical quantity introduced for the convenience of actual
exposure assessment that are convenient for actual measurement.
4 Overview
4.1 Protection Areas
The following four protection areas are defined, see Figure 1.
4.2 Limit Compliance Requirements
Comply with the following limit compliance requirements.
5 Limits
5.1 Electromagnetic Field Limits
5.1.1 Human exposure limits
Electromagnetic field limits of human exposure include basic limits and reference
levels, which are respectively shown in Table 1 and Table 2.The compliance with the
reference levels in Table 2 can ensure the compliance with the basic limits in Table 1.
5.1.2 Exposure limits of active implantable medical devices
In this Chapter, the corresponding frequency band of the limit requirements is. 79 kHz
~ 90 kHz.
5.2 Contact Current Limits
Contact current limits are shown in Table 4.
6 Test Methods
6.1 Test Conditions
6.1.1 Temperature, humidity and atmospheric pressure
The environmental requirements of the laboratory are as follows. °C
6.1.2 Test point
Within a 1.5 m horizontal range around the test point, there shall be no objects that
would affect the test. Primary devices shall be placed on non-metallic ground.
The environmental background value shall be not higher than 5% of the limit value in
Chapter 5.
6.2 Test Instruments
6.2.1 Test instruments of magnetic field
A three-axis isotropic low-frequency field strength probe shall be used. In addition, the
circular sensor area shall be not more than 100 cm2.The probe shall use peak
detection.
6.2.2 Test instruments of contact current
6.2.2.1 Overview
Test instrument is constituted of test impedance network and test electrodes. The
bandwidth should be more than 100 MHz.
6.2.2.2 Test impedance network
The perceptual or reactive current test impedance network shown in Figure 2 shall be
used for testing.
6.2.2.3 Test electrodes
Unless it is otherwise specified in the test instrument standard, the test electrodes shall
be one of the following two modes.
6.4 Test Method of Magnetic Field
6.4.1 Test range
Conduct electromagnetic field test for Protection Area 3, Protection Area 4 and off-
board power components.
6.4.2 Test point of Protection Area 3
The electromagnetic test shall be conducted in four test areas. the front, the rear, the
left and the right of the vehicle.
6.4.3 Test point of Protection Area 4
Before the test, open the door; adjust the seat to the middle position, as it is shown in
Figure 5.If the seat cannot be adjusted to this position, then, in accordance with the
seat position declared by the manufacturer, adjust the seat.
7 Evaluation of Test Result
7.1 Electromagnetic Field Test Result Evaluation
In terms of four test areas. Protection Area 3a, Protection Area 3b, Protection Area 4
and off-board power components, respectively evaluate the electromagnetic field test
result. See the evaluation procedure below.
7.2 Contact Current Test Result Evaluation
The evaluation procedure for contact current test result is as follows.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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