GB/T 38775.5-2021Electric vehicle wireless power transfer—Part 5: Electromagnetic compatibility requirements and test methods (English PDF)

3.1 Primary Device

Primary device refers to an energy transmitting terminal, a device that is coupled to the secondary device to convert electrical energy into an electromagnetic field and directionally transmit it.

3.2 Secondary Device

Secondary device refers to an energy receiving terminal, a device that is coupled to the primary device to receive the alternating electromagnetic field and convert it into electrical energy.

3.3 Off-board Supply Device

Off-board supply device is a collective term for ground-side devices of the electric vehicle wireless power transfer system.

3.4 On-board Supply Device

On-board supply device is a collective term for on-board devices of the electric vehicle wireless power transfer system.

4.1 Off-board Supply Device and On-board Supply Device

4.1.1 The wireless power transfer system composed of off-board supply device and on-board supply device shall satisfy the emission requirements of 7.1.

4.1.2 The off-board supply device shall satisfy the immunity requirements of 6.1 and the emission requirements of 7.2.

4.1.3 The on-board supply device shall satisfy the immunity requirements of 6.2 and the emission requirements of 7.3.

4.2 Off-board Supply Device and Vehicle

4.2.1 The wireless power transfer system composed of off-board supply device and vehicle shall satisfy the emission requirements of 7.4.

5.1 General Rules

5.1.1 Before the test, a test scheme shall be formulated, which includes at least the operating status, excitation function, monitoring function, determination criteria and intentional emissions, etc.

5.1.2 During the test, the test scheme shall be set in accordance with the actual plan of the wireless power transfer system. It may be adjusted in accordance with the manufacturer's regulations, unless otherwise specified.

5.1.3 The test arrangement, ground clearance, size offset, tilt angle, power supply and device parameter configuration, cable connection and other test conditions shall be recorded in the test report in detail.

5.1.4 When performing a radiated emission test, in accordance with the actual installation scheme of the off-board supply device product, the ground clearance of the wireless power transfer system shall be adjusted. In addition, within the parameter range of the product specification of the wireless power transfer system, simulate the X, Y and Z direction offsets between the primary device and secondary device, and the tilt angle along the X-axis, Y-axis and Z-axis; determine the maximum emission conditions of the wireless power transfer system.

5.1.5 The device function and performance criteria during and after the immunity test shall be recorded in the test report in detail.

5.2 Test Scheme of Component Device

5.2.1 Port

The ports of the off-board supply device and on-board supply device of the wireless power transfer system are shown in Figure 1.

5.2.2 Working condition

5.2.2.1 The configuration and operating mode of the system shall be specified in the test scheme. In addition, the actual conditions during the test shall be accurately recorded in the test report.

5.2.2.2 The test shall be performed in the following operating modes.

5.2.2.3 If the wireless power transfer system has a large number of similar ports or connector ports, then, a sufficient number of ports shall be selected to simulate the actual operating conditions. In addition, it shall be ensured that the test can cover all different types of terminals (for example, 20% of all ports or at least 4 ports).

5.2.2.4 The AC power supply specified in Appendix A shall be used. The test shall be carried out within the specified working range of the charging device, unless otherwise specified.

5.2.3 Load conditions

The test load shall make the wireless power transfer system work at 20% ~ 80% of the maximum continuous power. All other ports shall be connected to typical loads, for example, electronic load or resistive load.

5.3 Vehicle-related Test Scheme

5.3.2 Vehicle state

5.3.2.1 Before the start of the test, the state of charge of the vehicle's rechargeable power storage system shall be at a relatively low level. During the test, the state of charge of the vehicle's rechargeable power storage system shall be between 20% and 80%.

5.3.2.2 During the test, the vehicle shall be stationary, and the engine (if possible) shall be turned off. All devices that are not related to the test function and can be turned off for a long time by the driver or occupant shall be turned off.

5.3.2.3 During the immunity test, the vehicle's parking brake system shall satisfy.

5.3.2.4 During the immunity test, the vehicle shall be monitored to check the compliance of the vehicle. Except for the necessary test devices, the vehicle shall be no-load.

5.3.2.5 The state of charge of the vehicle's rechargeable power storage system at the beginning and the end of the test shall be recorded in the test report.

5.3.2.6 The state of the vehicle driving system and the state of the parking brake system during the immunity test shall be recorded in the test report.

5.3.3 State of off-board supply device

5.3.3.1 The ground clearance of the wireless power transfer system shall comply with

6.1 Immunity of Off-board Supply Device

6.1.1 Performance criteria

6.1.1.1 Performance criterion A During the execution of the test, or after the test, the off-board supply device shall continue to operate as expected within the allowable range defined by the off-board supply device manufacturer. Its operating status shall not be changed, including the working mode, charging voltage and current.

6.1.1.3 Performance criterion C

During the execution of the test, and after the test, the off-board supply device is changed to the fault protection state. If it already complies with the safety requirements defined in GB/T 38775.1-2020, this state requires user intervention to restart charging or automatically resume charging.

6.1.2 Immunity of non-residential environment

When the off-board supply device of the wireless power transfer system is expected to be used in a non-residential environment, the immunity requirements and test methods are shown in Table 1.

6.1.3 Immunity of residential environment

When the off-board supply device of the wireless power transfer system is expected to be used in a residential environment, the immunity requirements and test methods are shown in Table 2.

6.1.4 Radio-frequency, electromagnetic field, radiated immunity

6.1.4.1 If the off-board power unit is a floor-standing product, then, it shall be placed in accordance with the actual state of use; the test layout is shown in Figure 2.Products other than the floor-standing type shall be placed on an insulation test bench with a height of 0.8 m for testing; the test layout is shown in Figure 3.

6.1.4.2 The off-board power unit shall be placed on an insulating support material (dielectric constant <= 1.4) that is 0.05 m ~ 0.15 m higher than the test bench surface.

6.2 Immunity of On-board Supply Device

6.2.1 Performance criterion

The performance criterion of the immunity of on-board supply device shall comply with the stipulations of 6.1.1.

6.2.2 Immunity requirements of on-board supply device

The immunity requirements of on-board supply device are shown in Table 3.

6.2.3 Test method of radiated immunity

6.2.3.1 When the secondary device and the on-board power components cannot be separated, the test layout is shown in Figure 4.When the secondary device and the on-board power components can be separated, the test layout is shown in Figure 5.

6.2.3.2 The on-board power components shall be placed on an insulating support material (dielectric constant <= 1.4) with a height of 0.05 m ~ 0.15 m.

6.2.3.3 During the radiated immunity test, if the on-board power components can be separated from other parts of the wireless power transfer system, then, the other parts should be placed outside the test site. When the other parts are located in the test site, they should be placed beyond the radiation range of the transmitting antenna. If due to wire length limitations, they cannot be placed beyond the radiation range of the transmitting antenna, then, appropriate electromagnetic shielding measures shall be adopted.

6.2.3.4 The test shall be respectively performed under two polarization states of the transmitting antenna. vertical polarization and horizontal polarization.

6.2.3.5 If there are no other regulations, it shall be carried out with reference to the requirements of GB/T 33014.2.

6.2.4 Bulk current injection

6.2.4.1 The current injection probes are respectively placed on the power output line and control line of the on-board power components for the test. The distance between the injection probes and the simulated vehicle chassis is 150 mm. The test shall be carried out in a shielded room or a semi-anechoic chamber. See the test layout of the semi-anechoic chamber in Figure 6.

6.2.4.2 If there are no other regulations, the test shall be carried out with reference to the stipulations of GB/T 33014.4.

6.3 Radiated Immunity of Vehicle

6.3.1 Perform the radiated immunity test at the enclosure port; the field strength reference point is located in the vehicle. The off-board power components shall be placed outside the anechoic chamber; if they are placed in the anechoic chamber, they shall be placed beyond the radiation range of the transmitting antenna.

6.3.2 Respectively perform the measurement when the vehicle is in standby and charging modes.

7.1 Emission of Off-board Supply Device and On-board Supply Device

7.1.1 General rules

7.1.1.1 The wireless power transfer system shall satisfy the definition and requirements of Type A or Type B equipment of Group 2 in GB 4824-2019.

7.1.1.2 Each type of disturbance shall be measured under explicit and reproducible conditions.

7.1.1.3 Table 4 and Table 5 provide the test description, test method and test layout.

7.1.2 Limits and test conditions of low-frequency disturbance

7.1.2.2.1 The wireless power transfer system whose input current per phase is less than or equal to 16 A and is connected to the public low-voltage AC power distribution system shall comply with GB 17625.1.

7.1.2.2.2 The components and equipment of the wireless power transfer system whose input current per phase is greater than 16 A, less than or equal to 75 A, and is connected to the public low-voltage AC power distribution system shall comply with GB/T 17625.8.

7.1.2.1 General rules

The requirements for low-frequency disturbance are shown in Table 4.

7.1.2.3 7.1.2.2 Harmonic current

7.1.3 Limits and test conditions of radio-frequency disturbance

7.1.3.1 General rules

The requirements for radio-frequency disturbance are shown in Table 5.

7.1.3.7 Test layout of radiated emission

7.1.3.7.1 When testing in the frequency band of 9 kHz ~ 30 MHz, it is recommended to use a loop antenna with a diameter of 60 cm for testing; the antenna shall respectively be in the X-axis, Y-axis and Z-axis polarization directions;

7.1.3.7.2 When testing in the frequency band of 30 MHz ~ 1 GHz, a biconical antenna and a logarithmic antenna shall respectively be used for testing; the antenna shall respectively be in the horizontal polarization and vertical polarization directions.

7.1.3.7.3 After the antenna is tested on one side of the system under test; rotate the turntable by 180°, and the antenna is tested on the other side of the system.

7.3 Emission of On-board Supply Device

7.3.1 During the test, the on-board power components in the on-board supply device shall be considered as the test object.

7.3.2 During the radiated disturbance test, if the on-board power components can be separated from other parts of the wireless power transfer system, then, the other parts should be placed outside the test site. When the other parts are located in the test site, they should be placed beyond the lobe range of the receiving antenna. The on-board power components shall satisfy the electric field emission requirements specified in

GB/T 18655; the test layout may comply with GB/T 18655.