GB/T 38775.7-2021 PDF English
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Electric vehicle wireless power transfer - Part 7: Interoperability requirements and testing - Vehicle side
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GB/T 38775.7-2021: Electric vehicle wireless power transfer - Part 7: Interoperability requirements and testing - Vehicle side
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040
CCS T 35
Electric Vehicle Wireless Power Transfer - Part 7.
Interoperability Requirements and Testing - Vehicle
Side
Issued on. OCTOBER 11, 2021
Implemented on. MAY 1, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 4
Introduction... 6
1 Scope... 8
2 Normative References... 8
3 Terms and Definitions... 9
4 Abbreviations... 10
5 General Rules... 10
5.1 System Architecture... 10
5.2 Classification... 12
6 Requirements... 13
6.1 Requirements for On-board Reference Device... 13
6.2 Requirements for Safety... 14
6.3 Requirements for Output Power... 14
6.4 Requirements for System Efficiency... 15
7 Test Preparation... 16
7.1 Frequency Setting... 16
7.2 Setting of Alignment Tolerance Area and Alignment Point... 16
7.3 Selection of Output Voltage Measurement Point... 17
7.4 Functions and Pre-inspection of Test Object... 18
7.5 Layout of Test Device... 18
8 Test Methods... 20
8.1 Safety Test... 20
8.2 Test of System Efficiency and Output Power... 20
Appendix A (normative) On-board Reference Device of MF-WPT1, MF-WPT2
and MF-WPT3... 23
A.1 On-board Reference Device of MF-WPT1... 23
A.2 On-board Reference Device of MF-WPT2... 28
A.3 On-board Reference Device of MF-WPT3... 33
Appendix B (informative) Functions and Pre-inspection of Test Object... 39
B.1 Method of Initial Alignment Pre-inspection... 39
B.2 Pairing Pre-inspection... 44
B.3 Pre-inspection of Compatibility Detection... 45
B.4 Power Transmission... 45
Appendix C (informative) Frequency Detection and Frequency Lock... 47
C.1 General Rules... 47
C.2 Steps of Frequency Detection and Frequency Lock... 47
C.3 Implementation Methods of Frequency Detection and Frequency Lock... 49
Bibliography... 51
1 Scope
This document specifies the interoperability requirements and testing of the vehicle
side of electric vehicle wireless power transfer system, including system architecture,
classification, technical requirements, test preparation, interoperability testing and on-
board reference device, etc.
This document is applicable to electric vehicle static magnetic coupling wireless power
transfer system, whose maximum rated voltage of the power supply is 1,000 V (AC) or
1,500 V (DC) and the maximum rated output voltage is 500 V (DC); other rated output
voltages may take this as a reference in implementation.
2 Normative References
The contents of the following documents constitute indispensable clauses of this
document through normative references in the text. 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 19596 Terminology of Electric Vehicles
GB/T 38775.1-2020 Electric Vehicle Wireless Power Transfer - Part 1.General
Requirements
GB/T 38775.2-2020 Electric Vehicle Wireless Power Transfer - Part 2.Communication
Protocols between On-board Charger and Wireless Power Transfer Device
GB/T 38775.3-2020 Electric Vehicle Wireless Power Transfer - Part 3.Specific
Requirements
GB/T 38775.4-2020 Electric Vehicle Wireless Power Transfer - Part 4.Limits and Test
Methods of Electromagnetic Environment
GB/T 38775.5 Electric Vehicle Wireless Power Transfer - Part 5.Electromagnetic
Compatibility Requirements and Test Methods
GB/T 38775.6-2021 Electric Vehicle Wireless Power Transfer - Part 6.Interoperability
Requirements and Testing - Ground Side
3 Terms and Definitions
What is defined in GB/T 19596, GB/T 38775.1-2020, GB/T 38775.2-2020, GB/T
38775.3-2020 and GB/T 38775.6-2021, and the following terms and definitions are
applicable to this document.
3.1 Interoperability
Interoperability refers to the capability of off-board supply device and on-board supply
device of the same or different models and versions of wireless power transfer system
in implementing the interconnection of electric vehicle wireless power transfer through
information interaction and process control.
3.2 Primary Coil
Primary coil refers to a coil formed by one or multi-turn winding and capable of
generating an electromagnetic field.
3.3 Secondary Coil
Secondary coil refers to a coil formed by one or multi-turn winding and capable of
receiving electromagnetic field.
3.4 Alignment Tolerance Area
Alignment tolerance area refers to the area, in which, the MF-WPT system can satisfy
the interoperability requirements in the X-axis and Y-axis directions for wireless power
transfer when the ground clearance of the secondary device is determined.
3.5 Initial Alignment Check
Initial alignment check refers to the process, in which, the MF-WPT system determines
that the primary device and secondary device are within the alignment tolerance area
after the vehicle stops.
3.6 Pairing
Pairing refers to the pairing process between the on-board supply device and the
corresponding off-board supply device in the charging spot.
4 Abbreviations
The following abbreviations are applicable to this document.
CN. Compensation Network
CSU. Communication Service Unit
INV. Inverter
IVU. In-Vehicle Unit
MF-WPT. Wireless Power Transfer Through Magnetic Field
5 General Rules
5.1 System Architecture
Figure 1 shows the system architecture and components of the MF-WPT system.
5.2 Classification
5.2.1 Output power level classification
In accordance with the rated output power of the MF-WPT system, the on-board supply
device may be divided into different power levels, as it is shown in Table 1.
5.2.2 Classification of on-board supply device
The on-board supply device may be divided into Type-A and Type-B, in which.
5.2.3 Classification of ground clearance
In accordance with different ground clearances, the on-board reference device may be
divided into four types, as it is shown in Table 2.
6 Requirements
6.1 Requirements for On-board Reference Device
The on-board reference device shall be designed in accordance with the requirements
of Appendix A. For the on-board reference device, the interoperability with different off-
board supply devices shall satisfy the requirements of Table 3.
6.2 Requirements for Safety
The safety requirements of Type-A on-board supply device shall be tested in
accordance with the test method specified in 8.1.
The safety test results of Type-A on-board supply device shall comply with the safety
requirements in Chapter 10 of GB/T 38775.1-2020, the living body protection in 5.8.6
of GB/T 38775.3-2020, the limit compliance requirements in 4.2 and the stipulations of
limits in Chapter 5 of GB/T 38775.4-2020.
6.3 Requirements for Output Power
The output power test of the MF-WPT system composed of Type-A on-board supply
device and off-board reference device in Appendix A of GB/T 38775.6-2021 shall be
carried out in accordance with the test method in 8.2.During the test, the on-board
supply device shall support the off-board reference device to start with a power of not
lower than 0.25 kW/s.
6.4 Requirements for System Efficiency
MF-WPT system efficiency refers to the ratio of the output power of on-board supply
device (module 25 in Figure 1) to the input power of off-board supply device (module
7 Test Preparation
7.1 Frequency Setting
The working frequency of the on-board supply device shall be set in accordance with
the nominal frequency specified in Table 6.
7.2 Setting of Alignment Tolerance Area and Alignment Point
The alignment tolerance area of Type-A on-board supply device shall be provided by
the device manufacturer, and the provided offset range shall at least satisfy the
requirements of Table 7.
7.4 Functions and Pre-inspection of Test Object
Before the interoperability test of Type-A on-board supply device, the detection of initial
alignment check function, pairing function, compatibility and power transmission
should be completed. The requirements and test method of the initial alignment check
should refer to B.1 in Appendix B. The pairing function, compatibility and power
transmission detection should comply with the stipulations of B.2 ~ B.4.
7.5 Layout of Test Device
During the interoperability test, the material or component of simulated chassis needs
to be adopted to replace the vehicle chassis; the on-board supply device shall be
installed on the material or component of the simulated chassis. The material or
component of the simulated chassis includes two parts. shielding component and steel
plate. The shielding component may use the shielding plate shown in Figure 3, or it
may also be provided by the device manufacturer. If the shielding component is
provided by the device manufacturer, it shall be indicated in the test report. In the
interoperability test, the off-board reference device shall include all components, for
example, the enclosure. The test load should use an electronic load.
8 Test Methods
8.1 Safety Test
When the MF-WPT system is composed of Type-A on-board supply device and the off-
board reference device in Appendix A of GB/T 38775.6-2021, the safety test shall
comply with the stipulations of safety requirements in Chapter 10 of GB/T 38775.1-
2020.
8.2 Test of System Efficiency and Output Power
8.2.1 Selection of test points
The test points of the system output power and system efficiency shall at least satisfy
the stipulations of 8.2.2 in GB/T 38775.3-2020.If the allowable offset value in the X-
axis direction of the alignment tolerance area provided by the device manufacturer is
greater than 75 mm, and / or the allowable offset value in the Y-axis direction is greater
than 100 mm, then, the number of test points shall be increased. The added test points
are shown in Figure 4.
8.2.2 Test procedures
For the MF-WPT system with a system output voltage range of Uout-min ~ Uout-max, the
test procedures of system output power and system efficiency shall be.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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