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GB/T 38775 consists of the following parts under the general title Electric vehicle wireless power transfer:
——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 is Part 4 of GB/T 38775.
This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by and is under the jurisdiction of China Electricity Council.
Introduction
The issuing body of this document draws attention to the fact that claims of compliance with this document may involve the use of a patent concerning Clause 6.
The issuing body of this document takes no position concerning the evidence, validity and scope of this patent right.
The holder of this patent right has assured the issuing body of this document that he/she is willing to negotiate licenses under reasonable and non-discriminatory terms and conditions with any applicant. The statement of the holder of this patent right is registered with the issuing body of this document. Information may be obtained from:
Name of patent holder: Xiamen Newyea Science and Technology Co., Ltd/Xiamen Newyea Electrical Co., Ltd.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
Electric vehicle wireless power transfer - Part 4: Limits and test methods of electromagnetic environment
1 Scope
This part of GB/T 38775 specifies the limits and test methods of electromagnetic environment inside and outside the electric vehicle under wireless power transfer.
This part is applicable to the stationary magnetic field wireless power transfer, wherein, the maximum rated voltage of the power supply is 1,000V AC or 1,500V DC, and the maximum rated output voltage is 1,000V AC or 1,500V DC. The primary device is erected underground or above ground.
2 Normative references
The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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
For the purposes of this document, the terms and definitions given in GB/T 2900.60-2002 and GB/T 38775.1-2020, as well as the following apply.
3.1
occupational exposure
exposure of individuals to electromagnetic field due to fixed or designated occupational activities. Under proper indication and after proper training, workers have known and voluntarily accept the influence of electromagnetic field
3.2
public exposure
exposure of the public to electromagnetic field other than occupational exposure and medical exposure. Generally, the public is exposed to electromagnetic field unknowingly
3.3
medical exposure
exposure of patients receiving medical diagnosis or approved medical treatment or volunteers in medical research to electromagnetic field
3.4
active implantable medical device
active medical device in human body, which is implanted partially or totally into the human body by surgery or medical treatment, or introduced into the natural orifice by medical invasion and remained in the body after operation
Note 1: In this part, it refers to implantable cardiac pacemaker, implantable cardiac defibrillator and cardiac resynchronization device.
Note 2: It is revised from Definition 3.3 in GB 16174.1-2015.
3.5
touch current
current that flows through the human body or animal body when touching one or more accessible parts and components of a device or equipment
[GB/T 12113-2008, Definition 3.1]
3.6
basic restriction
restriction determined for human tissues that may cause harmful effects, which shall strictly conform to all known biophysical interaction mechanism and are usually difficult to measure. As long as the basic restriction is not exceeded, it may be confirmed that no known acute harmful effects will occur
3.7
reference level
physical quantity introduced to facilitate actual exposure assessment, which is used to determine whether the basic restriction is exceeded. a value exceeding the reference level does not necessarily exceed the basic restriction, so it is necessary to determine whether it meets the basic restriction
4 General
4.1 Protection areas
The four protection areas are defined below, as shown in Figure 1:
a) protection area 1: the operating area for electric vehicle wireless power transfer, which ensures the normal operation of wireless power transmission and is not exposed to users. Protection area 1 is a space formed by the outlines of primary and secondary devices;
b) protection area 2: the transition area between protection area 1 and protection area 3;
c) protection area 3: the surrounding area of the electric vehicle, i.e., the front, back, left and right of the parking position of the vehicle;
d) protection area 4: interior of an electric vehicle (cabin).
Protection area 3 is subdivided into the following two areas:
——protection area 3a: the area less than 70cm from the ground;
——protection area 3b: the area 70cm or above from the ground.
Figure 1 Schematic diagram for protection areas
4.2 Conformance to restriction
The following requirements for conformance to restriction shall be met:
——protection area 1 and protection area 2: the manufacturer should take reasonable measures, including:
control the active or passive access to protection areas;
carry out test and shutdown before entering the area with potential exposure as mentioned above;
make the exposure meet the electromagnetic field restriction for protection area 3a.
——protection area 3, protection area 4 and off-board power components: the touch current shall meet the restrictions in Table 4, and the electromagnetic field shall meet one of the following combinations:
basic restriction in Table 1 and magnetic field restriction in Table 3;
reference level in Table 2 and magnetic field restriction in Table 3.
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 General 4.1 Protection areas 4.2 Conformance to restriction 5 Restrictions 5.1 Electromagnetic filed restrictions 5.2 Restrictions of touch current 6 Test methods 6.1 Test conditions 6.2 Test instruments 6.3 Test state of wireless power transfer system 6.4 Electromagnetic field test method 6.5 Touch current test method 7 Test result evaluation 7.1 Evaluation of electromagnetic field test results 7.2 Evaluation of touch current test results Annex A (Informative) Test record forms Bibliography
ICS 43.040.99 K 81 GB 中华人民共和国国家标准 GB/T 38775.4--2020
电动汽车无线充电系统 第4部分：电磁环境限值与测试方法 Electric vehicle wireless power transfer-- Part 4: Limits and test methods of electromagnetic environment
A.5接触电流测试记录表格 接触电流测试记录表格示例参见表A5。 表A.5 接触电流测试记录表格示例 偏移量及机械气隙/离地间隙组合 测试点位置 输出电压 测试数据 dX mm dY mm dZ mm U2 mV 0 0 min
+max +max min
-max +max min
参考文献 [1] GB 16174.1--2015 手术植入物 有源植入式医疗器械 第1部分：安全、标记和制造商所提供信息的通用要求 [2] ISO 14117:2012 Active implantable medical devices--Electromagnetic compatibility--EMC test protocols for implantable cardiac pacemakers. implantable eardioverter defibrillators and cardiac resynchronization devices [3] ISO CD 19363;2017 Electrically propelled road vehicles--Magnetic field wireless power transfer element- Safety and interoperability requirements [4] IEC 60990.2016 Methods of measurement of touch current and protective conductor cur-rent [5] IEC 61980--1:2015 Electric vehicle wireless power transfer（WPT）system-- Part 1; General requirements [6] IEC 62233:2005 Measurement methods for electromagnetic fields of household appliances and similar apparatus with regard to human exposure [7] ICNIRP Guidelines: 2010 Guidelines for limiting exposure to time varying electric and magnetic fields（1 Hz to 100 kHz） [8] SAE J2954:2016 Wireless power transfer for light duty plug-in/ electric vehicles and alignment methodology [9] SAE J2954:2017 Wireless power transfer for light-duty plug in/ electric vehicles and alignment methodology
