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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 3 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 1, 3.1, 3.5, 4.1, 4.2, 5.1, 5.2, 5.3, 5.4, 5.5, 5.6, 5.8, 5.8.1, 5.8.3, 5.8.4, 5.8.5, 5.8.6, 5.8.9, 6.1, 7.1, 7.4, 7.7, 8.27, 8.8 and 8.8.3.
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: Witricity
Address: 57 Water Street, Watertown, MA, USA
Name of patent holder: Massachusetts Institute of Technology
Address: 57 Water Street, Watertown, MA, USA
Name of patent holder: Auckland United Services Limited
Address: 57 Water Street, Watertown, MA, USA
Name of patent holder: Zhongxing New Energy Automobile Co., Ltd.
Address: 1F, ZTE R&D Building, Hi-Tech Industrial Park, Xili Sreet, Nanshan District, Shenzhen, Guangdong
Name of patent holder: Zhonghui Chuangzhi Wireless Power Supply Technology Co., Ltd.
Address: No.11 Mingda West Road, Caishan District, Yantai, Shandong
Name of patent holder: Xiamen Newyea Science and Technology Co., Ltd./Xiamen Newyea Electrical Co., Ltd.
Address: 11F, Hesheng Building, No.8, Jinshan Road, Siming District, Xiamen
Name of patent holder: Huawei Technologies Co., Ltd.
Address: Huawei Base, Bantian, Longgang District, Shenzhen
Name of patent holder: Zhejiang VIE EVATRAN Electronic Technologies Co., Ltd.
Address: No. 211 Chuanda Road, Chuansha Town, Pudong New Area, Shanghai
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 3: Specific requirements
1 Scope
This part of GB/T 38775 specifies the specific requirements for electric vehicle wireless power transfer, including classification, general requirements, communication requirements, technical requirements and test methods, etc.
This part is applicable to the stationary magnetic field wireless power transfer of electric vehicle, 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.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB/T 14048.2 Low-voltage switchgear and controlgear - Part 2: Circuit-breakers
GB/T 16895.3-2017 Low-voltage electrical installations - Part 5-54: Selection and erection of electrical equipment - Earthing arrangements and protective conductors
GB/T 16916.1 Residual current operated circuit-breakers without integral over-current protection for household and similar uses (RCCBs) - Part 1: General rules
GB/T 176251 Electromagnetic compatibility - Limits - Limits for harmonic current emissions (equipment input current ≤16A per phase)
GB/T 17625.8 Electromagnetic compatibility - Limits - Limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16A and ≤75A per phase
GB/T 22794 Type F and type B residual current operated circuit-breakers with and without integral overcurrent protection for household and similar uses
GB/T 38775.1-2020 Electric vehicle wireless power transfer - Part 1: General requirements
GB/T 38775.4-2020 Electric vehicle wireless power transfer - Part 4: Limits and test methods of electromagnetic environment
Provisions of the People's Republic of China on Radio Spectrum Allocations (Decree No. 46 of the Ministry of Industry and Information Technology of the People's Republic of China)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 38775.1-2020 and the following apply.
3.1
stationary magnetic field wireless power transfer; MF-WPT
wireless power transfer mode from power supply to electrical load through magnetic coupling, with the medium of magnetic field and the stationary power supply and electrical load
3.2
system frequency
frequency range of power transmission by wireless power transfer system
3.3
nominal frequency
operating frequency of the system design. For the adjustable frequency system, when the primary device is aligned with the secondary device and all components operate stably with design parameters, the system will operate at the nominal frequency
3.4
secondary device ground clearance
minimum vertical distance between the lower surface of the secondary device and the ground.
Note: The lower surface of the secondary device may be of non-planar structure, and the secondary device erected may not be vertical to the ground.
3.5
automatic charging mode
charging process completed by the wireless power transfer system based on the charging parameter adjustment and corresponding operation according to the data provided for the electric vehicle
3.6
wireless charging control and management system; WCCMS
system responsible for functions such as power transfer coordination control, operation and maintenance monitoring management, business operation management and system management of one or more electric vehicle wireless power transfer systems
3.7
communication outage
communication outage between off-board and on-board supply devices if the off-board supply device fails to receive the data of on-board supply device within a fixed time or the on-board supply device fails to receive the data of off-board supply device
3.8
system efficiency
efficiency of power transfer from AC (or DC) power supply input to battery/on-board electrical device of electric vehicle
Note: See Figure 2 and Table 1 in GB/T 38771-2020 for test points.
4 Classification
4.1 By magnetic poles
The MF-WPT system is classified by magnetic poles as shown in Figure 1.
One to one Many to many Many to one
Secondary coil
Mechanical air gap
Primary coil
Figure 1 Magnetic pole structure
4.2 By resonant compensation topology
The resonant circuit of MF-WPT system is shown in Figure 2, and these resonant topologies may be used for the primary and secondary compensation.
Resonant topology Serial topology Parallel topology Parallel topology Serial topology Compound compensation
Secondary compensation
Mechanical air gap
Primary compensation
Serial topology Parallel topology Parallel topology Serial topology Compound compensation
Figure 2 Resonant compensation topology
Note: The primary and secondary compensation methods are not limited to the above resonant compensation topologies.
4.3 By input power classes
The classification by input power classes shall meet the requirements of 6.2, GB/T 38775.1-2020.
4.4 By service environment
The classification by service environment shall meet the requirements of 6.3, GB/T 38775.1-2020.
4.5 By erection modes
The classification by erection modes shall meet the requirements of 5.4.1, GB/T 38775.1-2020.
5 General requirements
5.1 System efficiency
The system efficiency at the rated operating point shall not be less than 85%. For the system output at rated power, the system efficiency shall not be less than 80% under all allowable offsets in vertical and horizontal directions.
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 General requirements
6 Communication requirements
7 Technical requirements
8 Test methods
Annex A (Informative) Primary and secondary devices
Annex B (Informative) Test records
