Electromagnetic compatibility conducted interference test system and method

Abstract

The invention provides an electromagnetic compatibility conducted interference testing system and method, and relates to the technical field of electromagnetic compatibility testing, and the system comprises a first power supply network, a second power supply network, and a generator subsystem. The first end of the first power supply network is connected with the generator subsystem through a high-voltage direct-current bus, and the second end is connected with a first load through the high-voltage direct-current bus; the first end of the second power supply network is connected with the generator subsystem through a high-voltage branch, and the second end is connected with a second load through the high-voltage branch; wherein the first power supply network and the second power supply network respectively comprise two high-voltage artificial power supply networks which are connected in parallel, the high-voltage artificial power supply networks are respectively provided with resistor interfaces, and the resistor interfaces are connected with the preset resistors in a one-to-one manner. On the basis, the connection relation between the resistor interface and the preset resistor is adjusted to adapt to different test scenes, so that the effect of stabilizing the load is achieved, and the method can be applied to the electrical testing compatibility test of the extended-range generator system.

Description

Technical Field

[0001] The present application relates to the technical field of electromagnetic compatibility testing, and in particular to an electromagnetic compatibility conducted interference testing system. Background Art

[0002] Electromagnetic Compatibility (EMC) testing is one of the routine tests for generator systems. The international EMC testing standards and national standards CISPR25, GBT18655, and GBT36282 specify standard EMC testing solutions for high-voltage systems and high-voltage electric drive systems.

[0003] However, with the rapid development of new energy vehicle technology, the generator system has also accelerated its replacement, and the extended-range generator system with integrated high-voltage junction box has been rapidly popularized. The above-mentioned existing EMC test scheme does not consider the impact of the high-voltage junction box on the EMC test and cannot meet the EMC conducted interference test requirements of the extended-range generator system.

[0004] Based on this, there is an urgent need to provide an EMC test solution to test the EMC conducted interference of the extended-range generator system. Summary of the invention

[0005] The present application discloses an electromagnetic compatibility conducted interference test system, which can be used to test the EMC conducted interference of an extended-range generator system.

[0006] On the one hand, an embodiment of the present application provides an electromagnetic compatibility conducted interference test system, comprising a first power supply network, a second power supply network, and a generator subsystem;

[0007] A first end of the first power supply network is connected to the generator subsystem via a high-voltage DC bus, and a second end is connected to a first load via the high-voltage DC bus;

[0008] A first end of the second power supply network is connected to the generator subsystem via a high-voltage branch line, and a second end is connected to a second load via the high-voltage branch line;

[0009] The first power supply network and the second power supply network respectively include two parallel high-voltage artificial power supply networks, and the high-voltage artificial power supply networks are respectively provided with resistance interfaces, and the resistance interfaces are connected one-to-one with the preset resistances.

[0010] In one embodiment, the electromagnetic compatibility conducted interference test system further includes a low voltage subsystem, the low voltage subsystem includes two low voltage artificial power supply networks and a low voltage battery;

[0011] The generator subsystem is connected to two low-voltage artificial power networks through low-voltage power lines, and the two low-voltage artificial power networks are connected to low-voltage batteries respectively;

[0012] Wherein, two low-voltage artificial power supply networks are respectively provided with corresponding resistance interfaces.

[0013] In one embodiment, when performing a DC bus electromagnetic compatibility conducted interference test using a high voltage method, two low voltage artificial power supply networks are connected one-to-one with preset resistors through corresponding resistor interfaces;

[0014] One high-voltage artificial power network in the first power network is connected one-to-one with a preset resistor through a corresponding resistor interface, and another high-voltage artificial power network is connected with an electromagnetic interference EMI receiver;

[0015] Both high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors.

[0016] In one embodiment, when performing split-line electromagnetic compatibility conducted interference testing using the high voltage method, two low-voltage artificial power supply networks are connected one-to-one with preset resistors through corresponding resistor interfaces;

[0017] The two high-voltage artificial power supply networks in the first power supply network are connected one-to-one with the preset resistors through corresponding resistor interfaces;

[0018] One high-voltage artificial power network in the second power network is connected one-to-one with the preset resistor through a corresponding resistor interface, and the other high-voltage artificial power network is connected to the EMI receiver.

[0019] In one embodiment, when performing an electromagnetic compatibility conducted interference test using a low voltage voltage method, a low voltage artificial power network in a low voltage subsystem is connected one-to-one with a preset resistor through a corresponding resistor interface, and another low voltage artificial power network is connected to an EMI receiver;

[0020] The two high-voltage artificial power supply networks in the first power supply network are connected one-to-one with the preset resistors through corresponding resistor interfaces;

[0021] Both high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors.

[0022] In one embodiment, when performing electromagnetic compatibility conducted interference testing using the high-voltage split-line high-voltage current method, two low-voltage artificial power supply networks are connected one-to-one with preset resistors through corresponding resistor interfaces;

[0023] The two high-voltage artificial power supply networks in the first power supply network are connected one-to-one with the preset resistors through corresponding resistor interfaces;

[0024] Both high-voltage artificial power supply networks in the second power supply network are not connected to the corresponding preset resistors;

[0025] Any point of the high-voltage branch line between the second power supply network and the generator subsystem is connected to the EMI receiver, and an additional shielding box is provided at the joint corresponding to any point.

[0026] In one embodiment, when the electrical compatibility conducted interference test is performed using the high-voltage DC bus current method, two low-voltage artificial power supply networks are connected one-to-one with preset resistors through corresponding resistor interfaces;

[0027] The two high-voltage artificial power supply networks in the first power supply network are connected one-to-one with the preset resistors through corresponding resistor interfaces;

[0028] Both high-voltage artificial power supply networks in the second power supply network are not connected to the corresponding preset resistors;

[0029] Any point of the high-voltage DC bus between the first power supply network and the generator subsystem is connected to the EMI receiver, and an additional shielding box is provided at the joint corresponding to any point.

[0030] In one embodiment, when performing an electrical compatibility conducted interference test using a low-voltage harness and low-voltage current method, two low-voltage artificial power supply networks are connected one-to-one with preset resistors through corresponding resistor interfaces;

[0031] The two high-voltage artificial power supply networks in the first power supply network are connected one-to-one with the preset resistors through corresponding resistor interfaces;

[0032] Both high-voltage artificial power supply networks in the second power supply network are not connected to the corresponding preset resistors;

[0033] Any point on the low-voltage power line between the low-voltage subsystem and the generator subsystem is connected to the EMI receiver, and an additional shielding box is arranged at the joint corresponding to any point.

[0034] In one embodiment, the first power network, the second power network, and the low voltage subsystem are all arranged in a designated area within the wave absorbing area;

[0035] The absorbing material is arranged on the test side of the boundary of the absorbing area;

[0036] Designated area grounding.

[0037] In one embodiment, the high voltage artificial power network includes a first resistor, a first capacitor, an inductor, a second capacitor, and a second resistor;

[0038] The first end of the first resistor is connected to the first end of the inductor and the first load or the second load, and the second end of the first resistor is grounded;

[0039] The first capacitor is connected in parallel with the first resistor;

[0040] The second end of the inductor is connected to the first end of the second capacitor and the generator subsystem, the second end of the second capacitor is connected to the first end of the second resistor, and the second end of the second resistor is grounded;

[0041] A resistor interface is provided between the connection line between the second capacitor and the second resistor.

[0042] In one embodiment, the electromagnetic compatibility conducted interference testing system further includes a control subsystem;

[0043] The control subsystem includes a controller, a first CAN box, a light converter, a fiber feedthrough, and a second CAN box;

[0044] The controller, the first CAN box, the optical converter, the optical fiber feedthrough, and the second CAN box are serially connected in sequence through optical fibers, and the second CAN box is connected to the generator subsystem through a low-voltage control line.

[0045] In one embodiment, the electromagnetic compatibility conducted interference testing system further includes a dynamometer main motor, and the dynamometer main motor is connected to the generator subsystem via a dynamometer shaft.

[0046] In a second aspect, an embodiment of the present application further provides an electromagnetic compatibility conducted interference test method, which is applied to any of the above-mentioned electromagnetic compatibility conducted interference test systems, and the method includes:

[0047] When the device under test of the generator subsystem is in working condition, detecting the motor operating parameters in the generator subsystem, the motor operating parameters including motor speed, torque, and mechanical output load;

[0048] Determine whether the motor operating parameters meet the specified conditions;

[0049] If so, based on any of the above-mentioned electromagnetic compatibility conducted interference test systems, an electromagnetic compatibility conducted interference test is performed on the device to be tested to obtain a test result, wherein the test result includes an electromagnetic compatibility conducted interference evaluation result.

[0050] The beneficial effects of this application are as follows:

[0051] The embodiment of the present application provides an electromagnetic compatibility conducted interference test system and method, wherein the system includes a first power supply network, a second power supply network, and a generator subsystem; the first end of the first power supply network is connected to the generator subsystem through a high-voltage DC bus, and the second end is connected to the first load through the high-voltage DC bus; the first end of the second power supply network is connected to the generator subsystem through a high-voltage branch line, and the second end is connected to the second load through the high-voltage branch line; wherein the first power supply network and the second power supply network respectively include two parallel high-voltage artificial power supply networks, and the high-voltage artificial power supply networks are respectively provided with a resistance interface, and the resistance interface is connected one-to-one with a preset resistance. Based on this, by adjusting the connection relationship between the resistance interface and the preset resistance, different test scenarios can be adapted, thereby playing a role in stabilizing the load, and can be applied to the electrical compatibility test of the extended-range generator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 1 ;

[0053] Figure 2 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 2 ;

[0054] Figure 3 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 3 ;

[0055] Figure 4 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 4 ;

[0056] Figure 5 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 5 ;

[0057] Figure 6 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 6 ;

[0058] Figure 7 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 7 ;

[0059] Figure 8 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 8 ;

[0060] Fig. 9 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 9 ;

[0061] Fig.10 A schematic diagram of a high voltage artificial power supply network provided for this application;

[0062] Fig.11 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 10 ;

[0063] Fig.12 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 10 one;

[0064] Fig.13 A schematic diagram of an electromagnetic compatibility conducted interference test system provided for this application Figure 10 two;

[0065] Fig.14 A schematic diagram of a generator high voltage method DC bus conducted interference test system provided in this application;

[0066] Fig.15 A schematic diagram of a high-voltage artificial power supply network connected to a load provided in this application;

[0067] Fig.16 A schematic diagram of a load under a common mode interference equivalent path provided by the present application;

[0068] Fig.17 A schematic diagram of a load under a differential mode interference equivalent path provided by the present application;

[0069] Fig.18 A schematic diagram of a high-voltage branch line LISN provided in the present application without connecting a 50Ω load;

[0070] Fig.19 A schematic diagram of a high-voltage branch line LISN connected to a 50Ω load provided in this application;

[0071] Fig. 20 A schematic diagram of a generator high voltage voltage method line conduction interference test (positive pole) system provided in this application;

[0072] Fig.21 A schematic diagram of a generator low voltage voltage method conducted interference test (positive pole) system provided in this application;

[0073] Fig. 22 A schematic diagram of a generator high voltage branch line high voltage current method conducted interference test system provided in this application;

[0074] Fig.23 A schematic diagram of a generator high-voltage DC bus high-voltage current method conducted interference test system provided in this application;

[0075] Fig.24 A schematic diagram of a generator low-voltage wiring harness low-voltage current method conducted interference test system provided in this application;

[0076] Fig.25 A flowchart of an electromagnetic compatibility conducted interference testing method provided in this application. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The specific operating methods in the method embodiments can also be applied to device embodiments or system embodiments. It should be noted that in the description of the present application, "multiple" is understood as "at least two". "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. A is connected to B, which can represent: A is directly connected to B and A is connected to B through C. In addition, in the description of the present application, words such as "first" and "second" are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0078] The embodiments of the present application are described in detail below in conjunction with the accompanying drawings.

[0079] With the rapid development of new energy vehicle technology, the generator system has also accelerated its replacement. The extended-range generator system with integrated high-voltage junction box has been rapidly popularized. The existing EMC test solution has the following shortcomings:

[0080] (1) The impact of the high-voltage junction box on EMC testing was not considered;

[0081] (2) The layout of the high-voltage branch lines connected to the load and the line impedance stabilization network (LISN, also known as the artificial power network) is also not reproducible;

[0082] (3) The working conditions of the generator and the drive motor are opposite, so it is necessary to propose the generator load test conditions.

[0083] Based on this, the existing EMC test solutions cannot meet the EMC conducted interference test requirements of the extended-range generator system.

[0084] In order to solve the above problems, the present application embodiment provides an electromagnetic compatibility conducted interference test system, such as Figure 1As shown, it is a schematic diagram of an electromagnetic compatibility conducted interference test system, including a first power supply network 101, a second power supply network 102, and a generator subsystem 103; a first end 101A of the first power supply network 101 is connected to the generator subsystem 103 through a high-voltage DC bus, and a second end 101B is connected to a first load 104 through the high-voltage DC bus; a first end 102A of the second power supply network 102 is connected to the generator subsystem 103 through a high-voltage branch line, and a second end 102B is connected to a second load 105 through a high-voltage branch line;

[0085] Among them, the first power supply network 101 includes two parallel high-voltage artificial power supply networks 1011, and the high-voltage artificial power supply network 1011 is provided with a resistance interface 1012, and the resistance interface 1012 is connected one-to-one with the preset resistor 106; the second power supply network 102 includes two parallel high-voltage artificial power supply networks 1021, and the high-voltage artificial power supply network 1021 is provided with a resistance interface 1012, and the resistance interface 1012 is connected one-to-one with the preset resistor 106.

[0086] Preferably, the resistance value of the preset resistor 106 is 50Ω.

[0087] Optionally, the first load 104 may be a battery simulator, a resistor, or other loads. When the first load is a battery simulator, a power line filter is provided between the second end 101B and the first load 104.

[0088] Preferably, the second load 105 is a high-power resistor, and the setting of its resistance value is determined according to the power of the second load 105. For example, if the power of the second load 105 is 3kW and the voltage of the high-voltage branch line is 300V, then the current of the high-voltage branch line is 10A. According to Ohm's formula It can be calculated that the high power resistance is 30Ω.

[0089] In one embodiment, if Figure 2 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. Figure 1 On the basis of the shown embodiment, it also includes a low-voltage subsystem 201, which includes two low-voltage artificial power networks 2011 and a low-voltage battery 2012; the generator subsystem 103 is connected to the two low-voltage artificial power networks 2011 through low-voltage power lines, and the two low-voltage artificial power networks 2011 are connected to the low-voltage batteries 2012 respectively; wherein the two low-voltage artificial power networks 2011 are respectively provided with corresponding resistance interfaces 1012.

[0090] In one embodiment, if Figure 3 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When the high voltage method is used to perform the DC bus electromagnetic compatibility conducted interference test, the above Figure 2In the illustrated embodiment, two low-voltage artificial power networks 2011 are respectively connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; one high-voltage artificial power network 1011 in the first power network 101 is connected one-to-one with the preset resistor Ry through the corresponding resistor interface 1012, and the other high-voltage artificial power network 1011 is connected to an electromagnetic interference (EMI) receiver 301; and neither of the two high-voltage artificial power networks 1021 in the second power network 102 is connected to the corresponding preset resistor Ry.

[0091] In one embodiment, if Figure 4 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When using the high voltage method to perform the split-line electromagnetic compatibility conducted interference test, Figure 2 On the basis of the illustrated embodiment, two low-voltage artificial power networks 2011 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power networks 1011 in the first power network 101 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; one high-voltage artificial power network 1021 in the second power network 102 is connected one-to-one with the preset resistor Ry through the corresponding resistor interface 1012, and the other high-voltage artificial power network 1021 is connected to the EMI receiver 301.

[0092] In one embodiment, if Figure 5 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When using the low voltage method to perform electromagnetic compatibility conducted interference test, Figure 2 On the basis of the illustrated embodiment, a low-voltage artificial power network 2011 in the low-voltage subsystem 201 is connected one-to-one with the preset resistor Ry through the corresponding resistor interface 1012, and another low-voltage artificial power network 2011 is connected to the EMI receiver 301; the two high-voltage artificial power networks 1011 in the first power network 101 are respectively connected one-to-one with the preset resistor Ry through the corresponding resistor interface 1012; and the two high-voltage artificial power networks 1021 in the second power network 102 are not connected to the corresponding preset resistors.

[0093] In one embodiment, if Figure 6 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When the high-voltage branch line high-voltage current method is used to perform electromagnetic compatibility conducted interference test, Figure 2On the basis of the illustrated embodiment, two low-voltage artificial power supply networks 2011 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1011 in the first power supply network 101 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1021 in the second power supply network 102 are not connected to the corresponding preset resistors; any point of the high-voltage branch line between the second power supply network 102 and the generator subsystem 103 is connected to the EMI receiver 301, and an additional shielding box 601 is provided at the corresponding joint of any point.

[0094] In one embodiment, if Figure 7 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When using the high-voltage DC bus current method to perform electrical compatibility conducted interference test, Figure 2 On the basis of the illustrated embodiment, two low-voltage artificial power supply networks 2011 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1011 in the first power supply network 101 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1021 in the second power supply network 102 are not connected to the corresponding preset resistor Ry; any point of the high-voltage DC bus between the first power supply network 101 and the generator subsystem 103 is connected to the EMI receiver 301, and an additional shielding box 601 is provided at the corresponding joint of any point.

[0095] In one embodiment, if Figure 8 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. When using the low-voltage harness and low-voltage current method to perform electrical compatibility conducted interference test, Figure 2 On the basis of the illustrated embodiment, two low-voltage artificial power supply networks 2011 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1011 in the first power supply network 101 are connected one-to-one with the preset resistor Ry through corresponding resistor interfaces 1012; two high-voltage artificial power supply networks 1021 in the second power supply network 102 are not connected to the corresponding preset resistor Ry; any point on the low-voltage power supply line between the low-voltage subsystem 201 and the generator subsystem 103 is connected to the EMI receiver 301, and an additional shielding box 601 is provided at the corresponding joint of any point.

[0096] In one embodiment, if Fig. 9 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. Figure 2Based on the embodiment shown, the first power network 101, the second power network 102, and the low voltage subsystem 201 are all arranged in a designated area 9011 within the absorbing area 901; an absorbing material 9012 is arranged on the test side of the boundary of the absorbing area 901, and the absorbing material 9012 can refer to Fig. 9 The black triangle in the figure is specifically an RF absorbing material; the designated area 9011 is grounded via a grounding strip 9013.

[0097] In one embodiment, if Fig.10 As shown in the figure, it is a schematic diagram of a high voltage artificial power supply network. Fig.10 In the embodiment, the high-voltage artificial power network 1011 or the high-voltage artificial power network 1021 includes a first resistor R1, a first capacitor C1, an inductor L, a second capacitor C2, and a second resistor R2; the first end of the first resistor R1 is connected to the first end of the inductor L and the first load 104 or the second load 105, and the second end of the first resistor R1 is grounded; the first capacitor C1 is connected in parallel with the first resistor R1; the second end of the inductor L is connected to the first end of the second capacitor C2 and the generator subsystem 103, the second end of the second capacitor C2 is connected to the first end of the second resistor R1, and the second end of the second resistor R2 is grounded; wherein a resistor interface 1012 is provided between the connection line between the second capacitor C2 and the second resistor R2.

[0098] In one embodiment, if Fig.11 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. Fig.11 In the embodiment, the electromagnetic compatibility conducted interference test system also includes a control subsystem; the control subsystem includes a controller 1111, a first CAN box 1112, an optical converter 1113, an optical fiber feedthrough 1114, and a second CAN box 1115; the controller 1111, the first CAN box 1112, the optical converter 1113, the optical fiber feedthrough 1114, and the second CAN box 1115 are connected in series in sequence through optical fibers, and the second CAN box 1115 is connected to the generator subsystem 103 through a low-voltage control line.

[0099] In one embodiment, if Fig.12 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. Fig.12 In the embodiment, the electromagnetic compatibility conducted interference test system further includes a dynamometer main motor 121 , and the dynamometer main motor 121 is connected to the generator subsystem 103 via a dynamometer shaft 122 .

[0100] In one embodiment, if Fig.13 As shown in the figure, it is a schematic diagram of another electromagnetic compatibility conducted interference test system. Fig.13In the embodiment, the first load 104 includes a power line filter 131 and a battery simulator 134 , wherein the power line filter 131 and the battery simulator 134 are connected in series, and the power line filter 131 is connected to the terminal 101B of the first power network 101 .

[0101] In order to explain the above-mentioned electromagnetic compatibility conducted interference test system in more detail, a specific application scenario is given as an example below. The content of the example can serve as a supplement to the above-mentioned embodiment. The above-mentioned embodiments, as well as each embodiment and this example, can refer to each other.

[0102] like Fig.14 The figure shows a schematic diagram of a generator high voltage method DC bus conduction interference test system. Fig.14 In the diagram, note 1: generator control computer; note 2: Can box; note 3: fiber optic converter; note 4: 12V low-voltage battery; note 5: low-voltage artificial power network; note 6: high-voltage artificial power network; note 7: 50Ω load; note 8: high-power resistor; note 9: reference ground plane; note 10: optical fiber; note 11: high-voltage branch line; note 12: high-voltage DC bus; note 13: low-voltage control line and power line; note 14: generator system; note 15: dynamometer shaft; note 16: dynamometer main motor; note 17: grounding strap; note 18: RF absorbing material; note 19: wall plate connector; note 20: power line filter; note 21: fiber optic feedthrough; note 22: battery simulator (as load); note 23: EMI receiver; note 24: additional shielding box; note 25: 50Ω coaxial cable; note 26: current receiving probe; note 27: dynamometer base; note 28: insulation foam. The circuit diagram corresponding to the high-voltage artificial power supply network can be referred to Fig.10 .

[0103] In this example, label 7 is a 50Ω load. Fig.15 As shown, it is connected between the test output terminal of the high-voltage artificial power network and the ground. Based on the arrangement of the high-voltage artificial power network and the 50Ω load, the normal working current directly passes through the inductor unimpeded to reach the device under test. At this time, the load impedance encountered by the common-mode interference after about 150kHz is 25Ω, reference Fig.16 , which is a schematic diagram of a load (50Ω in parallel) under a common-mode interference equivalent path; the load impedance encountered by differential-mode interference is 100Ω, refer to Fig.17 , is a schematic diagram of a load (50Ω series connection) under a differential mode interference equivalent path. The test result of this system is the superposition of common mode plus differential mode. Therefore, the two 50Ω loads here play the role of providing a stable load for interference, because the built-in load of the EMI receiver is also 50Ω, so when one of the positive and negative poles is connected to the EMI receiver, the load impedance remains unchanged.

[0104] In order to simulate the working state of the high-voltage branch line in the whole vehicle, it is necessary to select resistors with different resistance values ​​and powers according to the power of the load connected to the high-voltage branch line.

[0105] For example, if the PTC power is 3kW and the high voltage branch line voltage is 300V, then the current is 10A.

[0106] Then according to Ohm's formula The resistance power should be greater than 3KW.

[0107] At this time, the 30Ω resistor is Fig.14 The mark 8 in the figure provides a load similar to PTC for the high voltage branch line. Because PTC itself will also generate interference, the interference value will not only be that of the generator, so PTC is not used as mark 8 here.

[0108] exist Fig.14 Why is there no load connected to the LISN of the high-voltage branch line? Because when testing the conducted interference voltage of the high-voltage DC bus, it is necessary to ensure that the load of the high-voltage branch line is mainly this 30Ω load. The inductance value in the high-voltage artificial power supply network is relatively large, and the resonant frequency is basically reached at several hundred kHz, and the impedance begins to decrease. Therefore, at 1MHz~108MHz and the operating frequency, the load impedance is roughly equal to the impedance of this 30Ω resistor. Fig.18 As shown, it is a schematic diagram of the high-voltage branch line LISN not connected to a 50Ω load.

[0109] It should be noted that if the high-voltage branch line LISN is connected to a 50Ω load, then the approximate interference impedance (150kHz~108MHz) load is Fig.19 As shown, the differential impedance of the high voltage branch line is 100Ω in parallel with 30Ω. The interference load impedance becomes smaller, causing the interference path to change. Fig.14 The test results will change. At the same time, the common mode impedance will also change from the parasitic capacitance of the original 30Ω resistor to the parasitic capacitance in parallel with 25Ω, which will also become smaller. Such test results are inaccurate and cannot meet the test requirements. When simulating the interference of the high-voltage DC bus when the branch line vehicle is working, it will complicate the branch line impedance and make subsequent analysis difficult.

[0110] like Fig. 20 As shown, it is a schematic diagram of a generator high-voltage voltage method branch line conducted interference test (positive pole) system, wherein two high-voltage artificial power supply networks 6 and a low-voltage artificial power supply network 5 connected to the high-voltage DC bus 12 are both connected to a 50Ω load; of the two high-voltage artificial power supply networks 6 connected by the high-voltage branch line, one is connected to a 50Ω load, and the other is connected to an EMI receiver 23 through a wall panel connector 19.

[0111] like Fig.21As shown, it is a schematic diagram of a generator low-voltage voltage method conducted disturbance test (positive pole) system, wherein the two high-voltage artificial power supply networks 6 connected to the high-voltage DC bus 12 are both connected to a 50Ω load; two low-voltage artificial power supply networks 5, one of which is connected to a 50Ω load, and the other is connected to an EMI receiver 23 through a wall plate connector 19; and the two high-voltage artificial power supply networks 6 connected by the high-voltage branch line are not connected to a 50Ω load.

[0112] like Fig. 22 As shown, it is a schematic diagram of a generator high-voltage branch line high-voltage current method conducted interference test system, wherein the two high-voltage artificial power supply networks 6 connected to the high-voltage DC bus 12 are both connected to a 50Ω load; the two low-voltage artificial power supply networks 5 are both connected to a 50Ω load; the two high-voltage artificial power supply networks 6 connected by the high-voltage branch line are not connected to a 50Ω load; the high-voltage branch line is connected to the EMI receiver 23 through the wall panel connector 19.

[0113] like Fig.23 As shown, it is a schematic diagram of a generator high-voltage DC bus high-voltage current method conducted interference test system, wherein the two high-voltage artificial power supply networks 6 connected to the high-voltage DC bus 12 are both connected to a 50Ω load; the two low-voltage artificial power supply networks 5 are both connected to a 50Ω load; the two high-voltage artificial power supply networks 6 connected by the high-voltage branch line are not connected to a 50Ω load; the high-voltage DC bus is connected to the EMI receiver 23 through the wall panel connector 19.

[0114] like Fig.24 As shown, it is a schematic diagram of a generator low-voltage harness low-voltage current method conducted interference test system, wherein the two high-voltage artificial power supply networks 6 connected to the high-voltage DC bus 12 are both connected to a 50Ω load; the two low-voltage artificial power supply networks 5 are both connected to a 50Ω load; the two high-voltage artificial power supply networks 6 connected by the high-voltage branch line are not connected to a 50Ω load; the low-voltage control line and power line 13 are connected to the EMI receiver 23 through the wall panel connector 19.

[0115] For any of the above test system settings, the shielding configuration should be arranged according to the actual situation of the vehicle. Generally, all shielded high voltage (HV) components should be grounded normally with low impedance, such as cables, connectors, etc.; the equipment under test (EUT) and the load should be grounded; the outdoor HV battery simulator should be connected via a feed-through filter.

[0116] Unless otherwise specified, the length of the low voltage (LV) harness, HV harness, and HV branch harness parallel to the front end of the ground plane should be 1500mm ± 75mm, the length of the LV harness, HV harness, and HV branch harness (including connectors) should be 1700 + 300mm, and the distance between the HV test harness and the LV test harness should be 100 ± 100mm. The HV test harness and the HV branch harness should be arranged in close parallel.

[0117] All wiring harnesses should be placed on non-conductive materials with a low relative dielectric constant ≤1.4. The HV positive power line and HV negative power line 50mm±5mm above the ground plane can be single coaxial shielded cables, or share the same shielding layer.

[0118] Unless otherwise specified, the EUT housing should be connected to the ground plane directly or through a specified impedance. To avoid the influence of environmental noise, an environmental noise test should be performed before the test; the environmental noise level should be 6dB lower than the limit; the limit of conducted interference standard, the limit requirements can adopt the recommended limit of GBT18655-2018, or the recommended limit of the vehicle manufacturer's enterprise standard can be adopted.

[0119] Based on any of the above test systems, the present application also provides an electromagnetic compatibility conducted interference test method, such as Fig.25 As shown, the method includes the following steps:

[0120] S251, when the device under test of the generator subsystem is in working condition, detecting the motor operating parameters in the generator subsystem, the motor operating parameters including motor speed, torque, and mechanical output load;

[0121] S252, determining whether the motor operating parameters meet the specified conditions;

[0122] In the embodiment of the present application, the specified conditions refer to that the motor speed is 50% of the rated speed, the torque is 50% of the rated torque, and the mechanical output load reaches 25% of the continuous power, wherein the speed is output by the dynamometer and the torque is output by the generator system. The above data can be adjusted according to actual conditions.

[0123] S253: If yes, then based on any of the above-mentioned electromagnetic compatibility conducted interference test systems, perform an electromagnetic compatibility conducted interference test on the device to be tested to obtain a test result, wherein the test result includes an electromagnetic compatibility conducted interference evaluation result.

[0124] In the embodiment of the present application, if the speed or torque does not meet the specified conditions, the torque or speed can be adjusted to achieve 25% of the continuous power. When the mechanical output load cannot meet the power requirements, the working status of the EUT can be detailed in the test report.

[0125] The electromagnetic compatibility conducted interference test system and method provided in the embodiment of the present application can adapt to different test scenarios by adjusting the connection relationship between the resistance interface and the preset resistance, thereby playing the role of stabilizing the load, and can be applied to the electrical compatibility test of the extended-range generator system in various test environments. In addition, this test method takes into account the impact of the high-voltage junction box on the EMC test, and the arrangement of the high-voltage junction line connected to the load and the line impedance stabilization network has a certain degree of reproducibility; it can also adapt to the test environment where the generator and the drive motor have opposite working conditions.

[0126] It is emphasized again that the drawings are merely examples and not limitations on the structure, wherein the various schematic diagrams may be in a parallel relationship or a progressive relationship, may be combined with each other, or the various subsystem structures in the various schematic diagrams may be combined with reference to each other. The specific combination method is not limited in the embodiments of the present application.

[0127] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0128] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An electromagnetic compatibility conducted interference test system, It is characterized in that including a first power supply network, a second power supply network, and a generator subsystem; A first end of the first power supply network is connected to the generator subsystem via a high-voltage DC bus, and a second end thereof is connected to a first load via the high-voltage DC bus; A first end of the second power supply network is connected to the generator subsystem via a high-voltage branch line, and a second end thereof is connected to a second load via a high-voltage branch line; The first power supply network and the second power supply network respectively include two parallel high-voltage artificial power supply networks, and the high-voltage artificial power supply networks are respectively provided with resistance interfaces, and the resistance interfaces are connected one-to-one with preset resistances.

2. The system according to claim 1, It is characterized in that Also included is a low voltage subsystem, the low voltage subsystem comprising two low voltage artificial power supply networks and a low voltage battery; The generator subsystem is connected to the two low-voltage artificial power supply networks respectively through low-voltage power supply lines, and the two low-voltage artificial power supply networks are connected to the low-voltage batteries respectively; Wherein, the two low-voltage artificial power supply networks are respectively provided with corresponding resistance interfaces.

3. The system as claimed in claim 2, It is characterized in that When the high voltage method is used to perform the DC bus electromagnetic compatibility conducted interference test, the two low voltage artificial power supply networks are connected one-to-one with the preset resistors through corresponding resistor interfaces; One high-voltage artificial power network in the first power network is connected to the preset resistor one-to-one through a corresponding resistor interface, and the other high-voltage artificial power network is connected to an electromagnetic interference EMI receiver; Both of the two high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors.

4. The system as claimed in claim 2, It is characterized in that When the split-line electromagnetic compatibility conducted interference test is performed using the high voltage method, the two low-voltage artificial power supply networks are connected one-to-one with the preset resistors through corresponding resistor interfaces; The two high-voltage artificial power supply networks in the first power supply network are respectively connected one-to-one with the preset resistors through corresponding resistance interfaces; One high-voltage artificial power network in the second power network is connected to the preset resistor one-to-one through a corresponding resistor interface, and the other high-voltage artificial power network is connected to the EMI receiver.

5. The system as claimed in claim 2, It is characterized in that When the electromagnetic compatibility conducted interference test is performed using the low voltage method, a low voltage artificial power supply network in the low voltage subsystem is connected one-to-one with the preset resistor through a corresponding resistance interface, and another low voltage artificial power supply network is connected to the EMI receiver; The two high-voltage artificial power supply networks in the first power supply network are respectively connected one-to-one with the preset resistors through corresponding resistor interfaces; Both of the two high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors.

6. The system as claimed in claim 2, It is characterized in that When the electromagnetic compatibility conducted interference test is performed using the high-voltage branch line high-voltage current method, the two low-voltage artificial power supply networks are connected one-to-one with the preset resistors through corresponding resistor interfaces; The two high-voltage artificial power supply networks in the first power supply network are respectively connected one-to-one with the preset resistors through corresponding resistor interfaces; Both high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors; Any point of the high-voltage branch line between the second power supply network and the generator subsystem is connected to the EMI receiver, and an additional shielding box is provided at the joint corresponding to the any point.

7. The system as claimed in claim 2, It is characterized in that When the high-voltage DC bus current method is used to perform the electrical compatibility conducted interference test, the two low-voltage artificial power supply networks are connected one-to-one with the preset resistors through corresponding resistor interfaces; The two high-voltage artificial power supply networks in the first power supply network are respectively connected one-to-one with the preset resistors through corresponding resistor interfaces; Both high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors; Any point of the high-voltage DC bus between the first power supply network and the generator subsystem is connected to the EMI receiver, and an additional shielding box is provided at the joint corresponding to the any point.

8. The system as claimed in claim 2, It is characterized in that When the electrical compatibility conducted interference test is performed using the low-voltage harness and low-voltage current method, the two low-voltage artificial power supply networks are connected one-to-one with the preset resistors through corresponding resistor interfaces; The two high-voltage artificial power supply networks in the first power supply network are respectively connected one-to-one with the preset resistors through corresponding resistor interfaces; Both high-voltage artificial power supply networks in the second power supply network are not connected to corresponding preset resistors; Any point on the low-voltage power line between the low-voltage subsystem and the generator subsystem is connected to the EMI receiver, and an additional shielding box is arranged at the joint corresponding to the any point.

9. The system as claimed in claim 2, It is characterized in that The first power supply network, the second power supply network, and the low-voltage subsystem are all arranged in a designated area within the wave absorbing area; The test side of the boundary of the absorbing area is provided with absorbing material; The designated area is grounded.

10. The system according to claim 1, It is characterized in that The high-voltage artificial power supply network includes a first resistor, a first capacitor, an inductor, a second capacitor, and a second resistor; The first end of the first resistor is connected to the first end of the inductor and the first load or the second load, and the second end of the first resistor is grounded; The first capacitor is connected in parallel with the first resistor; The second end of the inductor is connected to the first end of the second capacitor and the generator subsystem, the second end of the second capacitor is connected to the first end of the second resistor, and the second end of the second resistor is grounded; The resistor interface is provided between the connection line between the second capacitor and the second resistor.

11. The system according to claim 1, It is characterized in that It also includes a control subsystem; The control subsystem includes a controller, a first CAN box, a light converter, a fiber feedthrough, and a second CAN box; The controller, the first CAN box, the optical converter, the optical fiber feedthrough, and the second CAN box are serially connected in sequence through optical fibers, and the second CAN box is connected to the generator subsystem through a low-voltage control line.

12. The system according to claim 1, It is characterized in that It also includes a dynamometer main motor, which is connected to the generator subsystem through a dynamometer shaft.

13. An electromagnetic compatibility conducted interference test method, applied to any one of claims 1 to 12 above, It is characterized in that The method comprises: When the device to be tested of the generator subsystem is in working condition, detecting the motor operating parameters in the generator subsystem, wherein the motor operating parameters include motor speed, torque, and mechanical output load; Determining whether the motor operating parameters meet specified conditions; If so, based on any one of the electromagnetic compatibility conducted interference test systems in claims 1 to 12 above, an electromagnetic compatibility conducted interference test is performed on the device under test to obtain a test result, wherein the test result includes an electromagnetic compatibility conducted interference evaluation result.

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