GB/T 38775.7-2021Electric vehicle wireless power transfer—Part 7:Interoperability requirements and testing—Vehicle side (English PDF)

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.

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.

6.1 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

7.1 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.

8.1 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.