GB/T 38775.6-2021 PDF in English
GB/T 38775.6-2021 (GB/T38775.6-2021, GBT 38775.6-2021, GBT38775.6-2021)
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Electric vehicle wireless power transfer -- Part 6: Interoperability requirements and testing -- Ground side
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Standards related to (historical): GB/T 38775.6-2021
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GB/T 38775.6-2021: PDF in English (GBT 38775.6-2021) GB/T 38775.6-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.99
CCS K 81
Electric Vehicle Wireless Power Transfer - Part 6:
Interoperability Requirements and Testing - Ground
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 ... 7
2 Normative References ... 7
3 Terms and Definitions ... 8
4 Symbols and Abbreviations ... 9
4.1 Symbols ... 9
4.2 Abbreviations ... 10
5 General Rules ... 10
5.1 System Architecture ... 10
5.2 Classification ... 11
6 Requirements ... 13
6.1 Requirements for Off-board Reference Device ... 13
6.2 Requirements for Preparation Stage before Charging ... 13
6.3 Requirements for Charging start-up Stage ... 13
6.4 Requirements for Charging Transmission Stage ... 14
6.5 Requirements for Charging Stop Stage ... 18
7 Test Preparation ... 18
7.1 Frequency Setting ... 18
7.2 Setting of Alignment Tolerance Area and Alignment Point ... 19
7.3 Selection of Output Voltage Measurement Point ... 20
7.4 Layout of Test Device ... 20
8 Test Methods ... 21
8.1 Test of Pre-charging Preparation Stage ... 21
8.2 Test of Charging Start-up Stage ... 22
8.3 Test of Charging Transmission Stage ... 28
Appendix A (normative) Off-board Reference Device ... 31
A.1 Mechanical Structure of Off-board Reference Device ... 31
A.2 Circuit Design of Off-board Reference Device ... 33
A.3 Coupling Coefficient of Off-board Reference Device ... 35
Appendix B (informative) Functions and Pre-inspection of Test Object ... 36
B.1 Positioning Detection Function ... 36
B.2 Initial Alignment Pre-inspection ... 37
B.3 Pairing Pre-inspection ... 37
B.4 Pre-inspection of Compatibility Detection ... 38
Appendix C (informative) Implementation Method of Positioning Detection
Function ... 40
C.1 General Rules ... 40
C.2 Low-frequency Excitation (LF) Scheme ... 40
C.3 LFM MMWAVE RADAR Scheme ... 44
Bibliography ... 47
Electric Vehicle Wireless Power Transfer - Part 6:
Interoperability Requirements and Testing - Ground
Side
1 Scope
This document specifies the interoperability requirements and testing of the ground
side of electric vehicle wireless power transfer system, including system architecture,
classification, technical requirements, test preparation, interoperability testing and off-
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 38775.7-2021 Electric Vehicle Wireless Power Transfer - Part 7: Interoperability
Requirements and Testing - Vehicle Side
the secondary coil and the primary coil.
3.7 Alignment
Alignment means that within the ground clearance range designed for the secondary
device, the relative positions of the primary coil and the secondary coil in the X-axis
and Y-axis directions are within the tolerance area.
3.8 Center Alignment Point
Center alignment point refers to the geometric center point of the alignment tolerance
area.
3.9 Chargeable Area
Chargeable area refers to a charging area formed by the primary coil and the
secondary coil in relative positions.
NOTE: the relative position is composed of the X-axis offset, Y-axis offset and ground
clearance of the secondary coil. After the secondary coil enters this area, wireless
power transfer is allowed.
3.10 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.
4 Symbols and Abbreviations
4.1 Symbols
The following symbols are applicable to this document.
ACCGA-VA: the detection accuracy of the relative position of the primary device and the
secondary device, which is composed of the X-axis detection accuracy and the Y-axis
detection accuracy.
ACClx: the detection accuracy of the relative position of the primary device and the
secondary device in the X-axis direction.
ACCly: the detection accuracy of the relative position of the primary device and the
secondary device in the Y-axis direction.
Uout-min: the minimum charging voltage required by the load, which may also be the
minimum output voltage of the MF-WPT system.
Uout-max: the maximum charging voltage required by the load, which may also be the
a) The initial alignment pre-inspection is completed, and the primary device and
the secondary device are in the chargeable area;
b) Pass the pairing pre-inspection;
c) Pass the pre-inspection of compatibility test;
d) Pass the frequency detection of on-board reference device and the frequency
is locked;
e) Pass the test of foreign object detection and living body protection function.
Type-A off-board supply device should complete the positioning detection function
during the charging start-up stage. The requirements for the positioning detection
function are shown in B.1 of Appendix B; the implementation method of the positioning
detection function is shown in Appendix C.
The test methods of foreign object detection and living body protection shall comply
with the stipulations of 8.2.
The requirements and test methods of initial alignment pre-inspection, pairing pre-
inspection and compatibility pre-inspection are shown in B.2 ~ B.4.
Type-A off-board supply device should support the frequency detection and frequency
locking function of the on-board reference device. The frequency detection and
frequency locking function of the on-board reference device should comply with the
requirements of Appendix C in GB/T 38775.7-2021.
The power increasing rate of the MF-WPT system composed of Type-A off-board
supply device and on-board reference device shall be not lower than 0.25 kW/s, and
should be not higher than 2 kW/s.
The requirements for the charging start-up stage of the MF-WPT system composed of
Type-B off-board supply device and on-board supply device shall be determined by the
device manufacturer and the user through negotiation.
6.4 Requirements for Charging Transmission Stage
6.4.1 General requirements
The manufacturer of Type-A off-board supply device shall provide the following
information:
---The maximum input power of the off-board supply device;
---The ground clearance classification supported by the off-board supply device
(maximum and minimum values);
2---control loop 2, DC-DC power control unit of ground-side, optional;
3---control loop 3, PFC power control unit of ground-side;
4---control loop 4, power control unit of vehicle-side;
5---control loop 5, the effective value of the current required for load charging is Iout-req, and the
load sends the request to IVU;
6---control loop 6, the effective value of the primary coil current required for vehicle-side
charging is Ip-req, and IVU sends the request to CSU;
7---control loop 7, the effective value of the primary coil current is Ip.
NOTE: the power transmission control units of control loop 1 and control loop 2 constitute
PTC.
Figure 2 -- Power Transmission Control Loop
The power transmission control loop of the MF-WPT system composed of Type-B off-
board supply device and on-board supply device is determined by the device
manufacturer and the user through negotiation.
6.4.3 Requirements for output power
The output power test of the MF-WPT system composed of Type-A off-board supply
device and on-board reference device shall be carried out in accordance with the test
method in 8.3. During the test, the on-board reference device shall support the off-
board supply device to start with a power of not lower than 0.25 kW/s.
In addition, the rated output power of the MF-WPT system composed of Type-A off-
board supply device and on-board reference device shall satisfy the stipulations of
Table 3, in which:
a) The MF-WPT system with an output power level of MF-WPT1 shall satisfy:
When the input power level of the off-board supply device is MF-WPT1, MF-
WPT2 and MF-WPT3, the system with an output power level of MF-WPT1
shall be able to achieve the maximum designed output power.
b) The MF-WPT system with an output power level of MF-WPT2 shall satisfy:
---When the input power level of the off-board supply device is MF-WPT2 and
MF-WPT3, the system shall be able to achieve the maximum designed
output power;
---When the input power level of the off-board supply device is MF-WPT1, the
system shall be able to achieve the rated power output of not lower than
3---vehicle driving direction.
Figure 3 -- Schematic Diagram of Center Alignment Point
The center alignment point of Type-A off-board supply device during the interoperability
test shall be marked on the surface of the device. It shall be the geometric center point
of the primary coil or be specified by the device manufacturer. During the test, the
coordinates of the center alignment point shall be: X = 0, Y = 0.
The center alignment point of Type-B off-board supply device during the test should be
marked on the surface of the device.
7.3 Selection of Output Voltage Measurement Point
During the interoperability test, for the test load with a charging voltage range of Uout-
min ~ Uout-max, the output voltage test point of the on-board reference device of MF-WPT
system shall at least include:
---The minimum value of output voltage;
---The minimum output voltage test point of the system’s full-power output. The
output voltage value of this test point is provided by the device manufacturer;
---The maximum value of output voltage;
---The maximum output voltage test point of the system’s full-power output. The
output voltage value of this test point is provided by the device manufacturer.
NOTE: for the output voltage that exceeds 500 V, the system output voltage test point
is provided by the device manufacturer.
7.4 Layout of Test Device
During the interoperability test, the material or component of simulated chassis shall
be adopted to replace the vehicle chassis; the on-board reference 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 4, 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 supply device shall include all components, for
example, the enclosure. The test load should use an electronic load. The on-board
reference device, shielding layer and simulated vehicle chassis shall be closely
attached.
The schematic diagram of the test bench layout of the interoperability test of MF-WPT
system is shown in Figure 4.
38775.1-2020.
The IP level of the off-board supply device shall comply with the stipulations of the IP
level of enclosure in 8.6.2 and the IP level of primary device in 8.6.3 of GB/T 38775.3-
2020.
The test of electromagnetic environment limits 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.
8.2 Test of Charging Start-up Stage
8.2.1 Test of foreign object detection
8.2.1.1 General rules
The test object of foreign object detection shall comply with the stipulations of Table 7
in GB/T 38775.3-2020.
The test object of foreign object detection includes two types:
---Type-1 is objects that may cause a risk of contact due to temperature rise and
shall at least include all temperature-rise test objects in Table 7 of GB/T
38775.3-2020;
---Type-2 is objects that may cause a risk of fire due to temperature rise and shall
at least include all ignition test objects in Table 7 of GB/T 38775.3-2020.
In accordance with the power transmission status of the MF-WPT system, the foreign
object detection shall test the following two conditions:
---Condition 1: the foreign object detection function is started when the MF-WPT
system is not performing power transmission. Under this condition, the MF-
WPT system should perform the test of foreign object detection;
---Condition 2: the foreign object detection function is started when the MF-WPT
system is performing power transmission. Under this condition, the MF-WPT
system shall perform the test of foreign object detection.
During the test of foreign object detection, the primary coil and the secondary coil shall
be in the maximum offset state under the maximum ground clearance. For the on-
board reference device of the corresponding power level, it shall be ensured that the
MF-WPT system is working at the maximum output power level. Under the above
circumstances, if the current of the primary coil does not reach the maximum designed
value, then, a test that the primary coil reaches the designed maximum current value
shall be added.
8.2.1.2 Test area
schematic diagram of area 7; h represents the variable of the interval test points in the
Z-axis direction.
Area 3 shall be composed of boundary test points that satisfy the EMF limits. The
distance between the boundary of area 4 and the boundary of area 3 shall be not less
than 10 cm.
Take the center alignment point of the lower surface of the primary coil as the zero
point; establish three-dimensional coordinates of X, Y and Z, in which, the XY plane
shall be parallel to the lower surface of the primary coil.
In the test point Ta-h, is the variable of the test point in the invasion direction. Figure
8 lists the invasion direction of some living bodies. The test points Ta-h and T(+1) a-h
shall be set at the same angle T. The value of T shall be not greater than 36°.
In the test point Ta-h, a is the variable of the test point at different angles in the invasion
direction. Figure 8 lists part of the angles of the test point T2a-h. The test points Ta-h and
T (a+1)-h shall be set at the same angle aT. The value of aT shall be not greater than 30°.
In the test point Ta-h, h is the variable of the interval test points in the Z-axis direction.
Figure 8 lists some of the intervals of the test point Ta-h. The test points Ta-h and Ta-
(h+1) shall be set at the same interval hLOD. The value of hLOD shall be set to 5 cm. If the
ground clearance Z/hLOD of the secondary device is a non-integer, then, the hLOD value
of the last set of test points may be less than 5 cm.
When the test object leaves area 4 in the opposite direction of the invasion direction in
Figure 8, the MF-WPT system should re-start the charging power transmission.
8.2.2.3 Test procedures
The test procedures of living body protection shall be:
a) Take the lower surface of the primary coil as the starting point of the test for
h. The test object invades area 4 in the direction of the test point T11-1. If the
system can detect the invasion and shut down, then, it shall be determined
that the living body protection function of the MF-WPT system at the test point
T11-1 is effective.
b) Add the value of a. If the system at the test point T1a-1 can detect the invasion
and shut down, then, it shall be determined that the living body protection
function of the MF-WPT system at the test point T1a-1 is effective.
c) Add the value of . If the system at the test point Ta-1 can detect the invasion
and shut down, then, it shall be determined that the living body protection
function of the MF-WPT system at the test point Ta-1 is effective.
d) Add the value of h. If the system at the test point Ta-h can detect the invasion
greater than or equal to 1;
Ymax---the maximum value of the Y-axis of the alignment tolerance area provided by the device
manufacturer;
Xm---the test point added on the X-axis, Xm = ± (75 + m 25) mm, in which, m is an integer
greater than or equal to 1;
Xmax---the maximum value of the X-axis of the alignment tolerance area provided by the device
manufacturer.
Figure 9 -- Schematic Diagram of Test Points
8.3.2 Test procedures of system output power and system efficiency
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:
a) The system output voltage is Uout-max. Test the system output power and
system efficiency when the on-board reference device is under the conditions
of rated ground clearance, the maximum ground clearance and the minimum
ground clearance, and under three states: 100% output power, 75% output
power and 50% output power of the system design, and when all test points
are without and with a deflection angle.
b) The system output voltage is 0.75 Uout-max. Test the system output power and
system efficiency when the on-board reference device is under the conditions
of rated ground clearance, the maximum ground clearance and the minimum
ground clearance, and under three states: 100% output power, 75% output
power and 50% output power of the system design, and when all test points
are without and with a deflection angle.
c) The system output voltage is Uout-min. Test the system output power and
system efficiency when the on-board reference device is under the conditions
of rated ground clearance, the maximum ground clearance and the minimum
ground clearance, and under three states: 100% output power, 75% output
power and 50% output power of the system design, and when all test points
are without and with a deflection angle.
d) The system output voltage is Uout-min and when the MF-WPT system cannot
realize 100% output power of the design, then, carry out the test in
accordance with the minimum output voltage that can achieve 100% output
power of the system design provided by the device manufacturer. Test the
system output power and system efficiency when the on-board reference
device is under the conditions of rated ground clearance, the maximum
ground clearance and the minimum ground clearance, and under three states:
100% output power, 75% output power and 50% output power of the system
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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