Electromagnetic interference filtering device and electric vehicle

Abstract

The present invention provides an electromagnetic interference filtering device and an electric vehicle, which relate to the field of vehicle control technology. The electromagnetic interference filtering device comprises: a shielding shell, and openings for AC wiring harnesses to pass through are respectively provided on opposite end surfaces of the shielding shell; a differential mode electromagnetic interference filtering component is arranged in the shielding shell and close to the electromagnetic interference source; a common mode electromagnetic interference filtering component is arranged in the shielding shell and away from the electromagnetic interference source; wherein the differential mode electromagnetic interference filtering component and the common mode electromagnetic interference filtering component are respectively passed through the AC wiring harness. The scheme of the present invention realizes the effective suppression of electromagnetic interference and ensures the normal operation of the vehicle and the components around the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of whole vehicle control, and in particular to an electromagnetic interference filtering device and an electric vehicle. Background Art

[0002] The AC slow charging line of an electric vehicle includes an AC line and a low-voltage line. When the electric vehicle is performing AC slow charging, the slow charging line transmits AC power and control signals to the on-board charger to charge the power battery.

[0003] Due to the transient working characteristics of the power electronic switch devices in the on-board charger, there will be a large amount of conducted electromagnetic interference; this conducted electromagnetic interference will be transmitted to the AC power grid along the AC line, affecting other electrical devices on the power grid, and will also be coupled to the control line along the AC line in the charging line, thereby affecting signal transmission, and even causing the on-board charger to fail to work properly, affecting the operation of the internal electrical components of the vehicle, and affecting the normal operation of the receivers around the vehicle. Based on this, effective suppression of electromagnetic interference has become an urgent problem to be solved. Summary of the invention

[0004] The object of the present invention is to provide an electromagnetic interference filtering device, so as to solve the problem in the prior art that the internal electrical components of the vehicle, the on-board charger and the receivers around the vehicle cannot work normally due to electromagnetic interference.

[0005] In order to achieve the above object, the present invention provides an electromagnetic interference filtering device, comprising:

[0006] A shielding shell, wherein openings for the AC wiring harness to pass through are respectively formed on opposite end surfaces of the shielding shell;

[0007] A differential mode electromagnetic interference filtering component is arranged in the shielding shell and close to the electromagnetic interference source;

[0008] A common-mode electromagnetic interference filtering component is disposed in the shielding shell and is far away from the electromagnetic interference source;

[0009] Wherein, the differential mode electromagnetic interference filtering component and the common mode electromagnetic interference filtering component are respectively arranged through the AC wiring harness.

[0010] Optionally, the differential mode electromagnetic interference filtering component includes:

[0011] A first differential mode magnetic ring is passed through the live wire in the AC wiring harness;

[0012] A second differential mode magnetic ring is passed through the neutral line in the AC wiring harness;

[0013] A differential mode capacitor has one end connected to the live line and the other end connected to the neutral line.

[0014] Optionally, the first differential mode magnetic ring and the second differential mode magnetic ring include: Sendust magnetic rings.

[0015] Optionally, the common mode electromagnetic interference filtering component includes:

[0016] A common mode magnetic ring is passed through the live wire and the neutral wire in the AC wiring harness;

[0017] A first capacitor and a second capacitor are arranged on a side of the common mode magnetic ring close to the differential mode electromagnetic interference filtering component;

[0018] The third capacitor and the fourth capacitor are arranged on a side of the common mode magnetic ring away from the differential mode electromagnetic interference filtering component;

[0019] Wherein, the first end of the first capacitor and the first end of the third capacitor are respectively connected to the live wire in the AC wiring harness; the first end of the second capacitor and the first end of the fourth capacitor are respectively connected to the neutral wire in the AC wiring harness; the second end of the first capacitor, the second end of the second capacitor, the second end of the third capacitor and the second end of the fourth capacitor are respectively connected to the ground wire in the AC wiring harness;

[0020] The ground wire is connected to the shielding shell.

[0021] Optionally, the common mode magnetic ring includes: a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring.

[0022] Optionally, the electromagnetic interference filtering device further includes:

[0023] A plurality of magnetic clamps are respectively arranged on a low-voltage wire harness from which electromagnetic interference is to be filtered out; the low-voltage wire harness from which electromagnetic interference is to be filtered out is wound around each of the magnetic clamps for a preset number of turns.

[0024] Optionally, the magnetic clamp comprises a nickel-zinc ferrite magnetic clamp.

[0025] The embodiment of the present invention further provides an electric vehicle, comprising: an on-board charger and a slow charging seat, and also comprising the electromagnetic interference filtering device as described above;

[0026] Wherein, the AC wiring harness between the on-board charger and the slow charging socket passes through the electromagnetic interference filtering device.

[0027] Optionally, the electromagnetic interference filtering device also includes: a plurality of magnetic clips arranged on the low-voltage wiring harness between the on-board charger and the slow charging socket.

[0028] Optionally, a fixed installation structure is provided on the shielding shell, and the shielding shell is connected to the body of the electric vehicle via the fixed installation structure.

[0029] The above technical solution of the present invention has at least the following beneficial effects:

[0030] The electromagnetic interference filtering device of the embodiment of the present invention realizes the shielding effect on electromagnetic interference by providing a shielding shell, and at the same time facilitates the grounding connection between the electromagnetic interference filtering device and external equipment; differential mode electromagnetic interference is suppressed by providing a differential mode electromagnetic interference filtering component in the shielding shell, and common mode interference is suppressed by providing a common mode electromagnetic interference filtering component in the shielding shell, thereby suppressing the conduction of electromagnetic interference along the AC wiring harness to a certain extent, and facilitating the normal operation of surrounding equipment and internal electrical components of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of an electromagnetic interference filtering device according to an embodiment of the present invention;

[0032] Figure 2 This is a schematic diagram of an electromagnetic interference filtering device according to an embodiment of the present invention installed on an electric vehicle.

[0033] Description of reference numerals:

[0034] 1-shielded shell, 2-differential mode electromagnetic interference filtering component, 21-first differential mode magnetic ring, 22-second differential mode magnetic ring, C1-differential mode capacitor, 3-common mode electromagnetic interference filtering component, 31-common mode magnetic ring, Y1-first capacitor, Y2-second capacitor, Y3-third capacitor, Y4-fourth capacitor, 41-live wire, 42-neutral wire, 43-ground wire, 44-low voltage wiring harness, 5-on-board charger, 6-slow charging seat, 7-connector, 8-magnetic clamp, 9A-left front wheel, 9B-right front wheel, 9C-left rear wheel, 9D-right rear wheel, 10-electromagnetic interference filtering device, 11-fixed installation structure. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0036] In view of the problem in the prior art that electromagnetic interference is conducted along the AC wiring harness, causing surrounding components to fail to work normally, the present invention provides an electromagnetic interference filtering device and an electric vehicle, which effectively suppresses electromagnetic interference, prevents electromagnetic interference from being conducted along the AC wiring harness, and ensures that components around the electromagnetic interference source can work normally.

[0037] like Figure 1 As shown, an embodiment of the present invention provides an electromagnetic interference filtering device, comprising:

[0038] A shielding shell 1, wherein openings for an AC wiring harness to pass through are respectively provided on opposite end surfaces of the shielding shell 1; the AC wiring harness is connected between an electromagnetic interference source and other components that cooperate with the electromagnetic interference source, that is, the AC wiring harness can conduct the electromagnetic interference generated by the electromagnetic interference source to the surroundings, that is, the AC wiring harness is an AC wiring harness for filtering out electromagnetic interference.

[0039] The differential mode electromagnetic interference filtering component 2 is arranged in the shielding shell 1 and close to the electromagnetic interference source; the differential mode electromagnetic interference filtering component 2 is used to effectively suppress the differential mode electromagnetic interference generated by the electromagnetic interference source.

[0040] The common-mode electromagnetic interference filtering component 3 is arranged in the shielding shell 1 and away from the electromagnetic interference source, and is used to effectively suppress the common-mode electromagnetic interference generated by the electromagnetic interference source.

[0041] The differential mode electromagnetic interference filtering component 2 and the common mode electromagnetic interference filtering component 3 are respectively arranged in the AC wiring harness.

[0042] In the electromagnetic interference filtering device of the embodiment of the present invention, the shielding shell 1 plays a shielding role for electromagnetic radiation, the differential mode electromagnetic interference filtering component 2 and the common mode electromagnetic interference filtering component 3 respectively realize the effective suppression of the differential mode electromagnetic interference and common mode electromagnetic interference conducted by the AC wiring harness, reduce the intensity of the electromagnetic interference conducted by the AC wiring harness, and improve the working environment of the electrical components around the AC wiring harness.

[0043] As an optional embodiment, Figure 1 As shown, the differential mode electromagnetic interference filtering component 2 includes:

[0044] The first differential mode magnetic ring 21 is passed through the live wire 41 in the AC wiring harness and is used to suppress electromagnetic interference conducted along the live wire 41 .

[0045] The second differential mode magnetic ring 22 is passed through the neutral line 42 in the AC wiring harness and is used to suppress electromagnetic interference conducted along the neutral line 42, which is commonly known as the zero line.

[0046] The differential mode capacitor C1 has one end connected to the live wire 41 and the other end connected to the neutral wire 42. It is used to suppress differential mode electromagnetic interference. Since differential mode electromagnetic interference exists between the live wire 41 and the neutral wire 42, the differential mode capacitor C1 of the embodiment of the present application is connected between the live wire 41 and the neutral wire 42.

[0047] Specifically, the first differential mode magnetic ring 21 and the second differential mode magnetic ring 22 include Sendust magnetic rings. Compared with ferrite magnetic rings, Sendust magnetic rings can effectively suppress differential mode electromagnetic interference.

[0048] It should be noted that, since the wire diameters of the live wire 41 and the neutral wire 42 are relatively large, in this embodiment, the live wire 41 passes through the first differential mode magnetic ring 21 but is not wrapped around the first differential mode magnetic ring 21, and the neutral wire 42 passes through the second differential mode magnetic ring 22 but is not wrapped around the second differential mode magnetic ring 22. Therefore, in order to improve the electromagnetic interference suppression effect of the first differential mode magnetic ring 21 and the second differential mode magnetic ring 22, in this embodiment, the dimensions of the first differential mode magnetic ring 21 and the second differential mode magnetic ring 22, such as width and thickness, can be flexibly determined based on test data.

[0049] As an optional embodiment, the common mode electromagnetic interference filtering component 3 includes:

[0050] The common mode magnetic ring 31 is passed through the live wire 41 and the neutral wire 42 in the AC wire harness to suppress the electromagnetic interference conducted by the live wire 41 and / or the neutral wire 42.

[0051] The first capacitor Y1 and the second capacitor Y2 are arranged on one side of the common mode magnetic ring 31 close to the differential mode electromagnetic interference filtering component 2;

[0052] The third capacitor Y3 and the fourth capacitor Y4 are arranged on a side of the common mode magnetic ring 31 away from the differential mode electromagnetic interference filtering component 2 .

[0053] Among them, the first end of the first capacitor Y1 and the first end of the third capacitor Y3 are respectively connected to the live wire 41 in the AC wiring harness; the first end of the second capacitor Y2 and the first end of the fourth capacitor Y4 are respectively connected to the neutral wire 42 in the AC wiring harness; the second end of the first capacitor Y1, the second end of the second capacitor Y2, the second end of the third capacitor Y3 and the second end of the fourth capacitor Y4 are respectively connected to the ground wire 43 in the AC wiring harness; the filtering effect of high-voltage common-mode interference is achieved.

[0054] The ground wire 43 is connected to the shielding shell 1 .

[0055] In this embodiment, the Y capacitors formed by the first capacitor Y1 and the second capacitor Y2, and the Y capacitors formed by the third capacitor Y3 and the fourth capacitor Y4 are arranged on both sides of the common mode magnetic ring 31, so that the common mode electromagnetic interference filtering component 3 is formed into a π-type filter circuit. Effective suppression of the common mode interference conducted by the AC wiring harness is achieved. By connecting the ground wire 43 to the shielding shell 1, unified connection of the ground wires in the electromagnetic interference filtering device is achieved, which facilitates the grounding connection between the electromagnetic interference filtering device and the external equipment.

[0056] Specifically, the common mode magnetic ring 31 includes: a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring.

[0057] Further, such as Figure 1As shown, as an optional embodiment, the electromagnetic interference filtering device also includes:

[0058] A plurality of magnetic clips 8 are respectively arranged on the low-voltage wire harness 44 to be filtered out of electromagnetic interference; the low-voltage wire harness 44 to be filtered out of electromagnetic interference is wound around each magnetic clip 8 for a preset number of turns. Specifically, the magnetic clip 8 comprises a nickel-zinc ferrite magnetic clip.

[0059] In this embodiment, by winding the low-voltage harness 44 around the magnetic clamp 8 for a preset number of turns, the inductance of the magnetic clamp 8 is increased, and the electromagnetic interference suppression strength of the magnetic clamp 8 is improved. Specifically, since the weight of the magnetic clamp is relatively small, the magnetic clamp 8 is fixedly installed with the low-voltage harness 44, and there is no need to consider additional fixing buckles, which simplifies the installation structure. In addition, in this embodiment, multiple magnetic clamps 8 are evenly arranged in the length direction of the low-voltage harness 44, which is conducive to reducing the electromagnetic interference intensity, improving the transmission quality of the signal, and ensuring the reliable and safe operation of the entire charging drive system.

[0060] The embodiment of the present invention realizes effective suppression of electromagnetic interference conducted by the AC wiring harness by passing the AC wiring harness through the shielding shell 1, the differential mode electromagnetic interference filtering component 2 and the common mode electromagnetic interference filtering component 3, thereby reducing the radiation emission intensity along the AC wiring harness; and realizes effective suppression of the conduction of electromagnetic interference by the low-voltage wiring harness 44 by arranging multiple magnetic clips 8 on the low-voltage wiring harness 44, thereby playing a role in strengthening the protection against electromagnetic interference.

[0061] The embodiment of the present invention further provides an electric vehicle, comprising: an on-board charger 5 and a slow charging seat 6, and also comprising the electromagnetic interference filtering device 10 as described above;

[0062] The AC wiring harness between the on-board charger 5 and the slow charging socket 6 passes through the electromagnetic interference filtering device 10 .

[0063] Specifically, Figure 2As shown, the electric vehicle includes: a left front wheel 9A, a right front wheel 9B, a left rear wheel 9C and a right rear wheel 9D; the slow charging seat 6 is located on the vehicle body near the top of the right rear wheel 9D of the electric vehicle, and the on-board charger 5 is located in the front cabin in front of the electric vehicle. The on-board charger 5 is connected to the slow charging seat 6 through the connector 7 with a slow charging harness, and the slow charging harness includes an AC harness consisting of a live wire 41, a neutral wire 42 and a ground wire 43, and a low-voltage harness 44 consisting of a connection confirmation signal line and a charging connection control signal line. Among them, all the slow charging harnesses are bundled together, that is: the AC harness and the low-voltage harness 44 have a strong wire and a low-voltage control line bundled together. From the perspective of electromagnetic compatibility, this design has crosstalk between wires of different voltage levels, and there is a problem of high-voltage wires interfering with low-voltage wires. Therefore, it is necessary to suppress the electromagnetic interference of the slow charging harness. Therefore, the electric vehicle of the embodiment of the present invention preferably has the electromagnetic interference filtering device 10 disposed between the on-board charger 5 and the slow charging seat 6 to achieve effective suppression of the electromagnetic interference conducted by the wiring harness, thereby preventing the electromagnetic interference from being transmitted along the wiring harness to the AC power grid during AC charging and affecting other electrical equipment on the power grid, and the electromagnetic interference from being coupled to the voltage wiring harness along the AC wiring harness, thereby affecting the control and signal transmission and causing the on-board charger 5 to be unable to work normally.

[0064] Furthermore, the electromagnetic interference filtering device 10 further includes: a plurality of magnetic clips 8 arranged on the low-voltage wiring harness 44 between the on-board charger 5 and the slow charging seat 6. The magnetic clips 8 are used to effectively suppress the electromagnetic interference conducted by the low-voltage wiring harness.

[0065] Furthermore, a fixed mounting structure 11 is provided on the shielding shell 1, and the shielding shell 1 is connected to the body of the electric vehicle through the fixed mounting structure 11. The electromagnetic interference filtering device 10 is connected to the body through the fixed mounting structure 11, and the electromagnetic interference filtering device 10 is grounded to the body.

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An electromagnetic interference filtering device, characterized in that: include: A shielding shell (1), wherein openings for passing an AC wiring harness are respectively provided on opposite end surfaces of the shielding shell (1); A differential mode electromagnetic interference filtering component (2) is arranged in the shielding shell (1) and close to the electromagnetic interference source; A common-mode electromagnetic interference filtering component (3) is arranged in the shielding shell (1) and is far away from the electromagnetic interference source; Wherein, the differential mode electromagnetic interference filtering component (2) and the common mode electromagnetic interference filtering component (3) are respectively arranged in the AC wiring harness; Wherein, the differential mode electromagnetic interference filtering component (2) comprises: A first differential mode magnetic ring (21) is passed through a live wire (41) in the AC wiring harness; A second differential mode magnetic ring (22) passing through a neutral line (42) in the AC line harness; A differential mode capacitor (C1), one end of which is connected to the live line (41) and the other end of which is connected to the neutral line (42); Wherein, the common mode electromagnetic interference filtering component (3) comprises: A common mode magnetic ring (31) is passed through a live wire (41) and a neutral wire (42) in the AC wiring harness; A first capacitor (Y1) and a second capacitor (Y2) are arranged on one side of the common mode magnetic ring (31) close to the differential mode electromagnetic interference filtering component (2); A third capacitor (Y3) and a fourth capacitor (Y4) are arranged on a side of the common mode magnetic ring (31) away from the differential mode electromagnetic interference filtering component (2); Wherein, the first end of the first capacitor (Y1) and the first end of the third capacitor (Y3) are respectively connected to the live wire (41) in the AC wiring harness; the first end of the second capacitor (Y2) and the first end of the fourth capacitor (Y4) are respectively connected to the neutral wire (42) in the AC wiring harness; the second end of the first capacitor (Y1), the second end of the second capacitor (Y2), the second end of the third capacitor (Y3) and the second end of the fourth capacitor (Y4) are respectively connected to the ground wire (43) in the AC wiring harness; The ground wire (43) is connected to the shielding shell (1).

2. The electromagnetic interference filtering device according to claim 1, characterized in that: The first differential mode magnetic ring (21) and the second differential mode magnetic ring (22) comprise: Sendust magnetic rings.

3. The electromagnetic interference filtering device according to claim 1, characterized in that: The common mode magnetic ring (31) comprises: a ferrite magnetic ring, a manganese zinc magnetic ring or a nanocrystalline magnetic ring.

4. The electromagnetic interference filtering device according to any one of claims 1 to 3, characterized in that: The electromagnetic interference filtering device also includes: A plurality of magnetic clamps (8) are respectively arranged on a low-voltage wire harness (44) from which electromagnetic interference is to be filtered out; the low-voltage wire harness (44) from which electromagnetic interference is to be filtered out is wound around each of the magnetic clamps (8) for a preset number of turns.

5. The electromagnetic interference filtering device according to claim 4, characterized in that: The magnetic clamp (8) comprises a nickel-zinc ferrite magnetic clamp.

6. An electric vehicle comprising: The on-board charger (5) and the slow charging seat (6), characterized in that they also include the electromagnetic interference filtering device according to any one of claims 1 to 5; Wherein, the AC wiring harness between the on-board charger (5) and the slow charging socket (6) passes through the electromagnetic interference filtering device.

7. The electric vehicle according to claim 6, characterized in that: The electromagnetic interference filtering device further comprises: a plurality of magnetic clips (8) arranged on a low-voltage wiring harness (44) between the on-board charger (5) and the slow charging seat (6).

8. The electric vehicle according to claim 6, characterized in that: The shielding shell (1) is provided with a fixed installation structure (11), and the shielding shell (1) is connected to the body of the electric vehicle via the fixed installation structure (11).

Images