GB/T 38775.3-2020 PDF English
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Electric Vehicle Wireless Power Transfer - Part 3: Specific Requirements
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GB/T 38775.3-2020: Electric Vehicle Wireless Power Transfer - Part 3: Specific Requirements---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38775.3-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.99
K 81
Electric Vehicle Wireless Power Transfer -
Part 3.Specific Requirements
Issued on. APRIL 28, 2020
Implemented on. NOVEMBER 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
Introduction... 4
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 7
4 Classification... 8
5 General Requirements... 9
6 Communication Requirements... 14
7 Technical Requirements... 14
8 Test Methods... 15
Appendix A (informative) Primary and Secondary Devices... 24
Appendix B (informative) Test Record... 28
1 Scope
This Part of GB/T 38775 specifies the specific requirements for electric vehicle wireless
power transfer system, including the classification, general requirements,
communication requirements, technical requirements and test methods, etc.
This Part is applicable to stationary magnetic coupling wireless power transfer system
of electric vehicles, with the maximum rated voltage of power supply of 1,000 V (AC)
or 1,500 V (DC); the maximum rated output voltage of 1,000 V (AC) or 1,500 V (DC).
2 Normative References
The following documents are indispensable to the application of this document. 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 4208-2017 Degrees of Protection Provided by Enclosure (IP code)
GB/T 14048.2 Low-voltage Switchgear and Control-gear - 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
Overcurrent Protection for Household and Similar Uses (RCCB) - Part 1.General
Rules
GB/T 17625.1 Electromagnetic Compatibility - Limits - Limits for Harmonic Current
Emissions (equipment input current ≤ 16 A 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 >
16 A and ≤ 75 A per Phase
3 Terms and Definitions
What is defined in GB/T 38775.1-2020, and the following terms and definitions are
applicable to this document.
3.1 Stationary Magnetic Field Wireless Power Transfer; MF-WPT
Stationary magnetic field wireless power transfer refers to a power transfer mode which
uses magnetic field as a medium to transfer wireless power from a power source to a
power load through magnetic coupling; the physical position of the power source and
the power load is in the stationary state.
3.2 System Frequency
System frequency refers to the frequency range of wireless power transfer system for
power transmission.
3.3 Nominal Frequency
Nominal frequency refers to the operating frequency of system design. In terms of
systems with an adjustable frequency, when the primary device and the secondary
device are aligned, and all components are stably operating with the designed
parameters, the system will operate at the nominal frequency.
3.4 Secondary Device Ground Clearance
Secondary device ground clearance refers to the minimum vertical distance between
the lower surface of the secondary device and the ground.
3.5 Automatic Charging Mode
During the charging process, the wireless power transfer system, in accordance with
the data provided by the electric vehicle, dynamically adjusts the charging parameters
and executes corresponding operations to complete the charging process.
3.6 Wireless Charging Control and Management System; WCCMS
Wireless charging control and management system is responsible for charging
coordination control, operation and maintenance monitoring management, business
operation management and system management functions of one of multiple electric
vehicle wireless power transfer systems.
4 Classification
4.1 By Magnetic Pole
In accordance with magnetic pole, the classification of MF-WPT is shown in Figure 1.
4.2 By Resonance Compensation Topology
The resonance circuit of MF-WPT system is shown in Figure 2.The primary device
and the secondary device may adopt these resonance topologies.
4.3 By Input Power Level
The classification by input power level shall comply with the stipulations of 6.2 in GB/T
38775.1-2020.
4.4 By Service Environment
The classification by service environment shall comply with the stipulations of 6.3 in
GB/T 38775.1-2020.
4.5 By Installation Mode
The classification by installation mode shall comply with the stipulations of 5.4.1 in
GB/T 38775.1-2020.
5 General Requirements
5.1 System Efficiency
At the rated operating point, system efficiency shall be not lower than 85%. When the
system is output at the rated power, under the condition of all allowable deviations in
the vertical and the horizontal directions, system efficiency shall be not lower than 80%.
5.2 System Frequency
System frequency of MF-WPT system shall satisfy the requirements in Table 1.
5.3 Mechanical Air Gap
Mechanical air gap of primary and secondary devices of MF-WPT system shall satisfy
the requirements in Table 2.
5.4 Ground Clearance
Ground clearance of secondary devices of MF-WPT system shall satisfy the
requirements in Table 3.
5.5 Offset Range
Within the offset range shown in Table 4, primary and secondary devices of MF-WPT
system shall satisfy the requirements of 7.6 in GB/T 38775.1-2020.
5.6 System Structure
MF-WPT system structure shall take Appendix A of GB/T 38775.1-2020 as a reference.
5.7 Primary Devices
5.7.1 Installation mode
Installation mode of primary devices is shown in the stipulations of 5.4 in GB/T 38775.1-2020.
5.7.2 Installation location
Installation location of coil of primary devices shall take A.1 of Appendix A as a
reference.
5.8 System Functions
5.8.1 Charging mode
MF-WPT system shall be equipped with the mode of automatic charging.
5.8.2 Standby awaken
When MF-WPT system is in standby state, it shall be able to be awaken by the off-
board devices.
5.8.3 Parameter detection
In accordance with information exchanged during the initialization stage, detect
interoperability parameters between the primary devices and the secondary devices,
5.8.6 Protection of living body
The off-board devices of MF-WPT system should have a function of living body
protection, which can judge whether a living body exists in Protection Area 1 and 2 in
GB/T 38775.4-2020.If a living body is detected, then, MF-WPT system sends out a
warning, and stops charging, or, does not initiate charging.
5.8.7 Safety interlocking
The state of being charged and the vehicle’s driving mode shall be in an interlocking
relationship.
5.8.8 Man-machine interaction function
MF-WPT system shall display the following information or state.
5.8.9 Abnormality protection
The off-board devices and on-board devices of MF-WPT system shall all be equipped
with a function of abnormality protection. See the specific requirements below.
6 Communication Requirements
6.1 Command and Control Communication
MF-WPT system shall be equipped with the capability of wireless communication
between the off-board devices and the on-board devices.
6.2 High-level Communication
In high-level communication, MF-WPT system shall be equipped with the capability of
wireless communication among the off-board devices, the on-board devices and the
wireless charging control and management system.
7 Technical Requirements
7.1 System Efficiency
MF-WPT system efficiency shall comply with the stipulations of 5.1.This Clause is
applicable to power level. MF-WPT1, MF-WPT2 and MF-WPT3.
7.2 Power Factor
Under the rated input and rated output conditions, MF-WPT system’s input power
factor shall be not lower than 0.98.
7.3 Input Harmonic Current
Merely applicable to the following categories of wireless charging devices.
7.4 Electromagnetic Environment Limits
Electromagnetic environment limits of MF-WPT system shall satisfy the requirements
of Chapter 5 in GB/T 38775.4-2020.
7.5 Protection against Electric Shock
The requirements for protection against electric shock of MF-WPT system shall comply
with the stipulations of 10.2 in GB/T 38775.1-2020.
7.6 Dielectric Strength Characteristics
The requirements for dielectric strength characteristics of MF-WPT system shall
comply with the stipulations of 10.2.3 and 10.2.4 in GB/T 38775.1-2020.
7.7 Overcurrent Protection and Short-circuit Protection
The overcurrent protection and short-circuit protection function of MF-WPT system
shall satisfy the requirements of 10.3 in GB/T 38775.1-2020.
7.8 Temperature Rise and Overheating Prevention
Temperature rise and overheating protection function of MF-WPT system shall satisfy
the requirements of 10.4 in GB/T 38775.1-2020.
8 Test Methods
8.1 Test Conditions and Environment
8.1.1 Test system
A schematic diagram of wireless charging test system is shown in Figure 3.
Figure 3 -- Schematic Diagram of Wireless Charging Test System
8.1.2 Test platform
Test platform can accommodate.
8.1.3 Ambient conditions
The test shall be conducted under the following ambient conditions.
8.1.4 Power source conditions
During the test, the power source conditions are as follows.
8.1.5 Test instrument requirements
Unless it is otherwise stipulated, the precision of the instruments used in the test shall
satisfy the following requirements.
8.1.6 Test load
The load described in the test shall select resistance load or electronic load.
8.2 System Efficiency
8.2.1 System efficiency test of MF-WPT system without offset
Under the rated input conditions, the system efficiency test of MF-WPT system under
the conditions of no offset under different power sections and different mechanical air
gaps is shown in Table B.1 in Appendix B.
8.2.2 System efficiency test of MF-WPT system with offset
The system efficiency test points are shown in Figure 4.
The requirements and recording of system efficiency test points with offset are shown
in Table B.2.
8.2.3 System efficiency test of MF-WPT system with Deflection
Test the system efficiency under the condition that the secondary coil deflects around
the Z axis. During the test, the deflection angle is 10°; the selection of test points is
shown in 8.2.2.
8.3 Power Factor
Under the rated input conditions, the power factor test of MF-WPT system under the
conditions of no offset under different power sections and different mechanical air gaps
is shown in Table B.4.
8.4 Harmonic Current
Under the rated input and rated output conditions, the harmonic current limit test of
MF-WPT system under the conditions of nominal air gap and no offset is shown in
Table B.6.
8.5 Electromagnetic Environment Limits
The test method of electromagnetic environment limits of MF-WPT system shall
comply with the requirements of Chapter 6 in GB/T 38775.4-2020.
8.6 Protection against Electric Shock
8.6.2 IP level of enclosure
The IP protection level of the enclosure of charging cabinet and cold-source cabinet
shall comply with the requirements of 10.2.5.2 in GB/T 38775.1-2020.The test method
shall comply with the stipulations of Chapter 13 and Chapter 14 in GB/T 4208-2017.
The IP protection level of the various modules of the on-board devices shall comply
with the requirements of 10.2.5.4 in GB/T 38775.1-2020.The test method shall comply
with the stipulations of Chapter 13 and Chapter 14 in GB/T 4208-2017.
8.6.3 IP level of primary devices
The IP protection level of primary devices shall comply with the requirements of
10.2.5.3 in GB/T 38775.1-2020.The test method shall comply with the stipulations of
Chapter 13 and Chapter 14 in GB/T 4208-2017.
8.6.4 IP level of secondary devices
The IP protection level of secondary devices shall comply with the requirements of
10.2.5.4 in GB/T 38775.1-2020.The test method shall comply with the stipulations of
Chapter 13 and Chapter 14 in GB/T 4208-2017.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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