GB/T 38775.7-2021 PDF in English
GB/T 38775.7-2021 (GB/T38775.7-2021, GBT 38775.7-2021, GBT38775.7-2021)
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Electric vehicle wireless power transfer -- Part 7: Interoperability requirements and testing -- Vehicle side
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Standards related to: GB/T 38775.7-2021
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GB/T 38775.7-2021: PDF in English (GBT 38775.7-2021) GB/T 38775.7-2021
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
Electric Vehicle Wireless Power Transfer - Part 7:
Interoperability Requirements and Testing - Vehicle
Side
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
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.
3.7 Off-board Reference Device
Off-board reference device refers to a test device that forms the MF-WPT system with
the on-board supply device to be tested.
NOTE: Appendix A of GB/T 38775.6-2021 provides the design of off-board reference
device.
3.8 On-board Reference Device
On-board reference device refers to a test device that forms the MF-WPT system with
the off-board supply device to be tested.
NOTE: Appendix A provides the design of on-board reference device.
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
PFC: Power Factor Correction
PPC: Power Pick-up Controller
PTC: Power Transfer Controller
5 General Rules
5.1 System Architecture
Figure 1 shows the system architecture and components of the MF-WPT system.
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.
The schematic diagram of the test bench layout of the interoperability test of MF-WPT
system is shown in Figure 3.
The simulated chassis should use 16Mn or similar steel; the size should be 1.5 m
1.5 m 0.7 mm; the thickness may be added to 1 mm. The shielding layer should use
6061 aluminum alloy or similar aluminum alloy; the size should be 1.1 m 1.1 m 0.7
mm; the thickness may be added to 1 mm.
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.
The IP level of the on-board supply device shall comply with the stipulations of 8.6.2
and 8.6.4 of GB/T 38775.3-2020.
The test of electromagnetic environment safety shall comply with the stipulations of
test methods in Chapter 6 and the evaluation of test result in Chapter 7 of GB/T
38775.4-2020.
The test of foreign object detection shall comply with the stipulations of 8.2.1 in GB/T
38775.6-2021.
The test of living body protection shall comply with the stipulations of 8.2.2 in GB/T
38775.6-2021.
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.
The test points shall take 25 mm as the step length. If the maximum values of the X-
axis and Y-axis of the alignment tolerance area provided by the device manufacturer
are not a multiple of 25 mm, then, the last test point of the X-axis and Y-axis may not
use 25 mm as the step length, and Xmax and Ymax shall be taken as the last test points
of the X-axis and Y-axis.
Appendix B
(informative)
Functions and Pre-inspection of Test Object
B.1 Method of Initial Alignment Pre-inspection
B.1.1 General rules
The initial alignment check is used for the MF-WPT system to detect the relative
position of the primary device and the secondary device before starting charging;
ensure that the primary device and the secondary device can achieve the power
transmission requirements and system efficiency requirements specified in 6.2 and 6.3
and comply with the requirements of electromagnetic environment safety in GB/T
38775.4-2020 and the requirements of electromagnetic compatibility in GB/T 38775.5.
The minimum allowable offset of the alignment tolerance area in the X-axis and Y-axis
directions shall satisfy the stipulations of 6.2.
B.1.2 General requirements
The initial alignment check shall be executed when the vehicle is in a stationary state.
The initial alignment check should be conducted in accordance with the method of C.2
or C.3 in GB/T 38775.6-2021.
If the relative position test result of the primary device and the secondary device
satisfies x ≤ 75 mm and y ≤ 100 mm or satisfies the allowable offset value of the
alignment tolerance area in the X-axis and Y-axis directions provided by the device
manufacturer, then, it passes the initial alignment check; otherwise, it fails the initial
alignment check, and the system shall not start power transmission.
After passing the initial alignment check, the system shall perform mutual inductance
detection, so as to ensure the safety and reliability of power transmission.
The manufacturer of Type-A on-board supply device should provide the following
information:
---The allowable offset value of the alignment tolerance area of the on-board
supply device in the X-axis and Y-axis directions;
---The maximum ground clearance and the minimum ground clearance of the on-
board supply device.
B.1.3 Test procedures
The test procedures of the initial alignment check function shall be as follows:
a) Set the on-board supply device to the maximum ground clearance;
b) The center alignment point of the on-board supply device is aligned with the
center alignment point of the off-board reference device; the system starts the
initial alignment check, and the result is that the center alignment point is
within the alignment tolerance area;
c) Move the center alignment point of the on-board supply device to the
boundary of the X-axis and Y-axis positive directions of the alignment
tolerance area (the boundary is the maximum allowable offset value minus 2
cm). The system starts the initial alignment check, and the result is that the
center alignment point is within the alignment tolerance area. Continue to
move the on-board supply device to beyond the maximum allowable offset
value by 2 cm in the X-axis positive direction; the result of the initial alignment
check is that the center alignment point is beyond the alignment tolerance
area. Move the center alignment point of the on-board supply device to the
maximum allowable offset value in the X-axis positive direction and beyond
the maximum allowable offset value by 2 cm in the Y-axis positive direction of
the alignment tolerance area; the result of the initial alignment check is that
the center alignment point is beyond the alignment tolerance area;
d) Move the center alignment point of the on-board supply device to the
boundary of the X-axis negative direction and the Y-axis positive direction of
the alignment tolerance area (the boundary is the maximum allowable offset
value minus 2 cm). The system starts the initial alignment check, and the
result is that the center alignment point is within the alignment tolerance area.
Continue to move the on-board supply device to beyond the maximum
allowable offset value by 2 cm in the X-axis negative direction; the result of
the initial alignment check is that the center alignment point is beyond the
alignment tolerance area. Move the center alignment point of the on-board
supply device to the maximum allowable offset value in the X-axis negative
direction and beyond the maximum allowable offset value by 2 cm in the Y-
axis positive direction of the alignment tolerance area; the result of the initial
alignment check is that the center alignment point is beyond the alignment
tolerance area;
e) Move the center alignment point of the on-board supply device to the
boundary of the X-axis positive direction and the Y-axis negative direction of
the alignment tolerance area (the boundary is the maximum allowable offset
value minus 2 cm). The system starts the initial alignment check, and the
result is that the center alignment point is within the alignment tolerance area.
Continue to move the on-board supply device to beyond the maximum
allowable offset value by 2 cm in the X-axis positive direction; the result of the
initial alignment check is that the center alignment point is beyond the
The realization process of the pairing function shall comply with:
a) IVU sends a start pairing request message to CSU, which includes the ID of
the on-board supply device or the vehicle VIN code, or other information that
can represent the identity of the on-board supply device.
b) If CSU does not support or cannot identify the pairing message sent by IVU,
then, it rejects the pairing request from IVU and feeds back the rejected
pairing message. If CSU supports the pairing message sent by IVU, then, it
returns the off-board supply device pairing message to IVU, which includes:
1) the ID of the off-board supply device or other information that can
represent the identity of the off-board supply device;
2) the signal of successful identification.
c) IVU receives the off-board supply device ID sent by CSU, confirms that the
pairing is successful and returns the pairing confirmation message to CSU.
d) CSU receives the pairing confirmation message from IVU and returns to IVU
whether the final pairing is successful or not. If the pairing is successful, then,
it returns that the off-board supply device with the ID has been successfully
paired with the on-board supply device. If the pairing fails, then, it returns a
pairing failure message.
e) The pairing function of Type-B off-board supply device is determined by the
device manufacturer and the user through negotiation.
B.3 Pre-inspection of Compatibility Detection
Type-A on-board supply device shall support the compatibility detection of the MF-WPT
system. During the compatibility detection, Type-A on-board supply device shall
provide the contents of No. 2, 3, 4, 6, 12, 13, 14 and 17 in Table B.1 of GB/T 38775.6-
2021, and should provide the contents of No. 7, 8 and 16 in Table B.1 of GB/T 38775.6-
2021.
The compatibility detection of Type-B MF-WPT system is determined by the device
manufacturer and the user through negotiation.
B.4 Power Transmission
The charging function of the MF-WPT system shall at least include three stages:
preparing for charging, starting charging and stopping charging. For Type-A on-board
supply device, the stage of preparing for charging shall comply with the requirements
of 6.2 in GB/T 38775.6-2021; the stage of starting charging shall comply with the
requirements of 6.3 in GB/T 38775.6-2021; the stage of stopping charging shall comply
with the requirements of 6.5 in GB/T 38775.6-2021.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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