A filter device

Abstract

The utility model relates to high -voltage motor control platform technical field discloses a filter device, include: DC input busbar;First filter capacitor busbar, is equipped with first pin and second pin on first filter capacitor busbar;Second filter capacitor busbar, is equipped with third pin and fourth pin on second filter capacitor busbar;At least one ground busbar;At least one Y capacitor, is connected between the pin of first pin and ground busbar or between the pin of third pin and ground busbar;Circuit board is connected with first filter capacitor busbar, second filter capacitor busbar and ground busbar. The utility model discloses through the circuit board is located Y capacitor below, can shorten the ground path, improves the discharge efficiency of noise, through the circuit board directly with ground busbar connection to realize the earthing, can form the multiple path low impedance parallel earthing network, can absorb the noise of different frequency band, can also ensure that the frequency response characteristic of filter device is not influenced, improves the suppression effect of common mode noise.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage motor control platform technology, specifically to a filtering device. Background Technology

[0002] In recent years, with the rapid development of electric vehicles, the motor controller, located on the high-voltage motor control platform, is a core component of the vehicle's powertrain, and its reliability directly affects the vehicle's performance and safety. The high-voltage and low-voltage ports of the motor controller are the main transmission paths for electromagnetic noise; therefore, a filtering system needs to be installed on the high-voltage motor control platform to suppress this electromagnetic interference.

[0003] A typical filtering system includes core components such as a magnetic ring, X capacitor, Y capacitor, and connecting copper busbars. The magnetic ring utilizes its inherent frequency impedance characteristics, through core material and winding design, to absorb common-mode noise energy in specific frequency bands, reducing high-frequency interference. The X capacitor is connected between the live and neutral wires to filter differential-mode noise. The Y capacitor is connected between the live wire and ground or between the neutral wire and ground, guiding common-mode noise to the grounding system. The connecting copper busbar optimizes the current path layout, reducing the impact of parasitic inductance on filtering performance. The filtering system not only suppresses external electromagnetic interference from affecting the motor controller but also prevents high-frequency noise from inside the motor controller from radiating outwards through cables, thus avoiding interference with onboard electronic equipment (such as BMS and sensors).

[0004] However, when designing the grounding of circuit boards in a filtering system, a direct single-point grounding method is usually adopted. Although this method is suitable for low-frequency circuits, in high-frequency circuits, the increased grounding path impedance can easily lead to noise coupling or ground potential fluctuations, thus affecting the filtering effect. Utility Model Content

[0005] In view of this, the present invention provides a filtering device to solve the problem of poor filtering effect caused by direct single-point grounding of the circuit board in the existing filtering system.

[0006] This utility model provides a filtering device, including: DC input bus, including positive output terminal and negative output terminal; The first filter capacitor bus is connected to the positive output terminal, and the first filter capacitor bus is provided with a first pin and a second pin. The second filter capacitor bus is connected to the negative output terminal, and the second filter capacitor bus is provided with a third pin and a fourth pin. At least one grounding busbar; At least one Y capacitor is connected between the first pin and the pin of the ground bus or between the third pin and the pin of the ground bus; The circuit board is located below the Y capacitor and is connected to the first filter capacitor bus, the second filter capacitor bus, and the ground bus.

[0007] Beneficial effects: By setting up a Y capacitor, common-mode noise between the positive terminal and ground or the negative terminal and ground can be guided to the grounding system, blocking the propagation of common-mode noise through the power line, thereby improving the electromagnetic immunity of the equipment and ensuring electrical safety; by placing the circuit board below the Y capacitor, the grounding path can be shortened, thereby reducing parasitic inductance and improving the discharge efficiency of high-frequency noise; by connecting the circuit board directly to the grounding bus to achieve grounding, a multi-path low-impedance parallel grounding network can be formed, which can absorb noise of different frequency bands and avoid the impedance increase problem of traditional single-point grounding in high-frequency scenarios, thereby ensuring that the frequency response characteristics of the filter device are not affected and improving the common-mode noise suppression effect.

[0008] In one optional embodiment, two grounding busbars and two Y capacitors are provided. The grounding busbars include a first grounding busbar and a second grounding busbar, and the Y capacitors include a first Y capacitor and a second Y capacitor. The first grounding bus has a fifth pin, the second grounding bus has a sixth pin, the first Y capacitor is connected between the first pin and the fifth pin, and the second Y capacitor is connected between the third pin and the sixth pin.

[0009] In one optional implementation, the filtering device includes: Capacitor X is connected between the second pin and the fourth pin.

[0010] Beneficial effects: By setting up an X capacitor, its high-frequency and low-impedance characteristics can be utilized to provide a bypass path for high-frequency differential-mode noise between the positive and negative terminals, allowing the high-frequency interference current to circulate and be consumed in the loop between the positive and negative terminals, thereby suppressing its impact on subsequent circuits and ensuring the stability of the power supply voltage.

[0011] In one optional implementation, the filtering device includes: The first base has three first fixing parts, and the first Y capacitor, the second Y capacitor and the X capacitor are respectively fixed in the three first fixing parts; And / or, the X capacitor is disposed between the first Y capacitor and the second Y capacitor.

[0012] Beneficial effects: By placing the X capacitor between the first Y capacitor and the second Y capacitor, the size of the filter device can be reduced, thereby improving the space utilization of the high-voltage motor control platform and reducing production costs.

[0013] In one optional embodiment, there are two DC input buses, including a first DC input bus and a second DC input bus. One end of the second DC input bus is connected to the first DC input bus. The positive output terminal of the second DC input bus is connected to the first filter capacitor bus, and the negative output terminal is connected to the second filter capacitor bus.

[0014] In one alternative embodiment, at least one of the DC input buses is fitted with a magnetic ring.

[0015] Beneficial effects: By setting up a magnetic ring, its high-frequency impedance characteristics can be used to suppress high-frequency common-mode noise between the positive and negative poles and ground, thereby reducing the common-mode noise radiated or conducted to external devices through cables. In addition, the high permeability material and winding method of the magnetic ring can provide high-frequency impedance to enhance the suppression capability of common-mode interference, thereby ensuring that the electromagnetic compatibility of the system meets the standards.

[0016] In one optional embodiment, the magnetic ring is fitted onto both the first DC input bus and the second DC input bus.

[0017] In one alternative implementation, the planes of the two magnetic rings are arranged perpendicular to each other.

[0018] Beneficial effects: By setting the planes of the two magnetic rings perpendicular to each other, the size of the filter device can be reduced, thereby improving the space utilization of the high-voltage motor control platform and reducing production costs.

[0019] In one optional implementation, the filtering device includes: The second base has two second fixing parts, and two magnetic rings are fixed to the two second fixing parts respectively.

[0020] In one alternative embodiment, the first DC input bus is fixed to the second base; And / or, the first DC input bus includes an input terminal. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a filtering device according to an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shown is a structural schematic of the filter device without the first and second bases. Figure 3 for Figure 1 A schematic diagram of the first angle of the left half of the filter device shown; Figure 4 for Figure 1 A schematic diagram of the second angle of the left half of the filter device shown; Figure 5 for Figure 3 An exploded view of the left half of the filter device shown; Figure 6 for Figure 1 A schematic diagram of the right half of the filter device shown; Figure 7 for Figure 6 An exploded view of the right half of the filter device shown. Figure 8 for Figure 1 The circuit diagram of the filter device is shown.

[0023] Explanation of reference numerals in the attached figures: 1. First filter capacitor bus; 101. First pin; 102. Second pin; 2. Second filter capacitor bus; 201. Third pin; 202. Fourth pin; 3. Circuit board; 4. First ground bus; 401. Fifth pin; 5. Second ground bus; 501. Sixth pin; 6. First Y capacitor; 7. Second Y capacitor; 8. X capacitor; 9. First base; 10. First DC input bus; 11. Second DC input bus; 12. Magnetic ring; 13. Second base. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0026] According to an embodiment of the present invention, a filtering device is provided, comprising: a DC input bus, including a positive output terminal and a negative output terminal; a first filter capacitor bus 1, connected to the positive output terminal, the first filter capacitor bus 1 having a first pin 101 and a second pin 102; a second filter capacitor bus 2, connected to the negative output terminal, the second filter capacitor bus 2 having a third pin 201 and a fourth pin 202; at least one ground bus; at least one Y capacitor, connected between the first pin 101 and the pin of the ground bus or between the third pin 201 and the pin of the ground bus; and a circuit board 3, disposed below the Y capacitor, connected to the first filter capacitor bus 1, the second filter capacitor bus 2, and the ground bus.

[0027] By setting up a Y capacitor, common-mode noise between the positive terminal and ground or the negative terminal and ground can be guided to the grounding system, blocking the propagation of common-mode noise through the power line, thereby improving the electromagnetic immunity of the equipment and ensuring electrical safety. By placing the circuit board 3 below the Y capacitor, the grounding path can be shortened, thereby reducing parasitic inductance and improving the discharge efficiency of high-frequency noise. By directly connecting the circuit board 3 to the grounding bus, a multi-path low-impedance parallel grounding network can be formed, which can absorb noise of different frequency bands and avoid the impedance increase problem of traditional single-point grounding in high-frequency scenarios, thereby ensuring that the frequency response characteristics of the filter device are not affected and improving the suppression effect of common-mode noise.

[0028] In one embodiment, the DC input bus, the first filter capacitor bus 1, the second filter capacitor bus 2, and the ground bus are all made of copper. As an alternative implementation, the DC input bus, the first filter capacitor bus 1, the second filter capacitor bus 2, and the ground bus can also be made of other metal materials such as aluminum; no further restrictions are imposed here.

[0029] like Figures 2-5 As shown, in one embodiment, two grounding busbars and two Y-capacitors are provided. The grounding busbars include a first grounding busbar 4 and a second grounding busbar 5, and the Y-capacitors include a first Y-capacitor 6 and a second Y-capacitor 7. The first grounding busbar 4 has a fifth pin 401, and the second grounding busbar 5 has a sixth pin 501. The first Y-capacitor 6 is connected between the first pin 101 and the fifth pin 401, and the second Y-capacitor 7 is connected between the third pin 201 and the sixth pin 501. The first Y-capacitor 6 is fixedly connected to the first pin 101 and the fifth pin 401, and the second Y-capacitor 7 is fixedly connected to the third pin 201 and the sixth pin 501 by welding. As an alternative implementation, only one set of grounding busbars and Y-capacitors may be provided. As an alternative implementation, the first Y-capacitor 6 can also be fixedly connected to the first pin 101 and the fifth pin 401, and the second Y-capacitor 7 can also be fixedly connected to the third pin 201 and the sixth pin 501 by bolts; no further restrictions are imposed here.

[0030] like Figure 2 As shown, the first filter capacitor bus 1, the second filter capacitor bus 2, and the grounding bus are all provided with internally threaded steel sleeves on the side near the circuit board 3, and the internally threaded steel sleeves are fixedly connected to the circuit board 3 by bolts. As an alternative implementation, the first filter capacitor bus 1, the second filter capacitor bus 2, and the grounding bus are also provided with bent sections on the side near the circuit board 3, and the bent sections are fixedly connected to the circuit board 3 by welding.

[0031] like Figures 2-5 As shown, in one embodiment, the filtering device includes an X capacitor 8 connected between the second pin 102 and the fourth pin 202. By setting the X capacitor 8, its high-frequency, low-impedance characteristics can be utilized to provide a bypass path for high-frequency differential-mode noise between the positive and negative terminals, allowing the high-frequency interference current to circulate and be consumed in the loop between the positive and negative terminals, thereby suppressing its impact on subsequent circuits and ensuring the stability of the power supply voltage.

[0032] like Figures 1-2 As shown, in one embodiment, the X capacitor 8 is disposed between the first Y capacitor 6 and the second Y capacitor 7. By disposing the X capacitor 8 between the first Y capacitor 6 and the second Y capacitor 7, the size of the filtering device can be reduced, thereby improving the space utilization of the high-voltage motor control platform and reducing production costs. As an alternative implementation, the first Y capacitor 6 may be disposed between the X capacitor 8 and the second Y capacitor 7, or the second Y capacitor 7 may be disposed between the first Y capacitor 6 and the X capacitor 8; no further limitations are imposed here.

[0033] like Figure 3 , Figure 5 As shown, in one embodiment, the filtering device includes: a first base 9, which has three first fixing parts, and the three first fixing parts respectively fix a first Y capacitor 6, a second Y capacitor 7, and an X capacitor 8. The first fixing part is a first cavity, in which the first Y capacitor 6, the second Y capacitor 7, and the X capacitor 8 are fixed and sealed with potting compound. As an alternative implementation, the first fixing part can also be a first slot, in which the first Y capacitor 6, the second Y capacitor 7, and the X capacitor 8 are snapped and fixed.

[0034] In one embodiment, the first filter capacitor bus 1, the second filter capacitor bus 2, the first grounding bus 4, and the second grounding bus 5 are all connected to the first base 9 by insert injection molding. Alternatively, the first filter capacitor bus 1, the second filter capacitor bus 2, the first grounding bus 4, and the second grounding bus 5 can also be connected to the first base 9 by welding or bolting.

[0035] like Figures 6-7As shown, in one embodiment, there are two DC input buses, including a first DC input bus 10 and a second DC input bus 11. One end of the second DC input bus 11 is connected to the first DC input bus 10. The positive output terminal of the second DC input bus 11 is connected to the first filter capacitor bus 1, and the negative output terminal is connected to the second filter capacitor bus 2. The first DC input bus 10 includes an input terminal connected to a DC power supply.

[0036] In one embodiment, the first DC input bus 10 and the second DC input bus 11, the second DC input bus 11 and the first filter capacitor bus 1, and the second DC input bus 11 and the second filter capacitor bus 2 are all fixedly connected by bolts. As an alternative implementation, the first DC input bus 10 and the second DC input bus 11, the second DC input bus 11 and the first filter capacitor bus 1, and the second DC input bus 11 and the second filter capacitor bus 2 can also be fixedly connected by welding; no further restrictions are imposed here.

[0037] like Figures 6-7 As shown, in one embodiment, a magnetic ring 12 is fitted on both the first DC input bus 10 and the second DC input bus 11. Alternatively, a magnetic ring 12 may be fitted on only one of the DC input buses. By using the magnetic ring 12, its high-frequency impedance characteristics can be utilized to suppress high-frequency common-mode noise between the positive and negative poles and ground, thereby reducing common-mode noise radiation or conduction to external devices through cables. Furthermore, the high permeability material and winding method of the magnetic ring 12 provide high-frequency impedance to enhance the suppression capability of common-mode interference, thus ensuring that the system's electromagnetic compatibility meets standards.

[0038] like Figures 6-7 As shown, in one embodiment, the planes containing the two magnetic rings 12 are arranged perpendicularly to each other. By arranging the planes containing the two magnetic rings 12 perpendicularly to each other, the size of the filter device can be reduced, thereby improving the space utilization of the high-voltage motor control platform and reducing production costs. As an alternative implementation, the planes containing the two magnetic rings 12 can also be arranged at an acute angle; no further restrictions are imposed here.

[0039] like Figures 6-7 As shown, in one embodiment, the filtering device includes: a second base 13, which has two second fixing parts, each fixing two magnetic rings 12. The second fixing part is a second cavity, and the two magnetic rings 12 are fixed within the second cavity and sealed with glue. Alternatively, the second fixing part can also be a second slot, where the two magnetic rings 12 are snapped into place.

[0040] In one embodiment, the first DC input bus 10 is fixed to the second base 13. The first DC input bus 10 and the second base 13 are connected by bolts. Alternatively, the first DC input bus 10 and the second base 13 can be connected by welding; this is not a limitation.

[0041] like Figure 2 , Figure 8 As shown, in one embodiment, the DC power supply receives current sequentially through the first DC input bus 10 and the second DC input bus 11. Both the first DC input bus 10 and the second DC input bus 11 are housed within a magnetic ring 12, which suppresses common-mode noise through its high-frequency impedance characteristics. Subsequently, the current is shunted to the filter network through the first filter capacitor bus 1 and the second filter capacitor bus 2. Here, the X capacitor 8 is connected between the positive and negative terminals to filter out differential-mode noise. The first Y capacitor 6 guides the common-mode noise between the positive terminal and ground to the first ground bus 4, and the second Y capacitor 7 guides the common-mode noise between the negative terminal and ground to the second ground bus 5, forming a low-impedance discharge path. The circuit board 3 is connected to the first ground bus 4 to reduce parasitic inductance and optimize the high-frequency noise suppression effect.

[0042] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A filtering device, characterized in that, include: DC input bus, including positive output terminal and negative output terminal; The first filter capacitor bus (1) is connected to the positive output terminal. The first filter capacitor bus (1) is provided with a first pin (101) and a second pin (102). The second filter capacitor bus (2) is connected to the negative output terminal. The second filter capacitor bus (2) is provided with a third pin (201) and a fourth pin (202). At least one grounding busbar; At least one Y capacitor is connected between the first pin (101) and the pin of the ground bus or between the third pin (201) and the pin of the ground bus; The circuit board (3) is located below the Y capacitor and is connected to the first filter capacitor bus (1), the second filter capacitor bus (2) and the ground bus.

2. The filtering device according to claim 1, characterized in that, Two grounding busbars and two Y capacitors are provided. The grounding busbars include a first grounding busbar (4) and a second grounding busbar (5). The Y capacitors include a first Y capacitor (6) and a second Y capacitor (7). The first grounding bus (4) is provided with a fifth pin (401), the second grounding bus (5) is provided with a sixth pin (501), the first Y capacitor (6) is connected between the first pin (101) and the fifth pin (401), and the second Y capacitor (7) is connected between the third pin (201) and the sixth pin (501).

3. The filtering device according to claim 2, characterized in that, The filtering device includes: X capacitor (8) is connected between the second pin (102) and the fourth pin (202).

4. The filtering device according to claim 3, characterized in that, The filtering device includes: The first base (9) is provided with three first fixing parts, and the three first fixing parts are respectively fixed with the first Y capacitor (6), the second Y capacitor (7) and the X capacitor (8); And / or, the X capacitor (8) is located between the first Y capacitor (6) and the second Y capacitor (7).

5. The filtering device according to any one of claims 1 to 4, characterized in that, The DC input bus is provided in two parts, including a first DC input bus (10) and a second DC input bus (11). One end of the second DC input bus (11) is connected to the first DC input bus (10). The positive output end of the second DC input bus (11) is connected to the first filter capacitor bus (1), and the negative output end is connected to the second filter capacitor bus (2).

6. The filtering device according to claim 5, characterized in that, At least one of the DC input busbars is fitted with a magnetic ring (12).

7. The filtering device according to claim 6, characterized in that, The magnetic ring (12) is fitted on both the first DC input bus (10) and the second DC input bus (11).

8. The filtering device according to claim 7, characterized in that, The planes in which the two magnetic rings (12) are located are perpendicular to each other.

9. The filtering device according to claim 7, characterized in that, The filtering device includes: The second base (13) is provided with two second fixing parts, and two magnetic rings (12) are fixed to the two second fixing parts respectively.

10. The filtering device according to claim 9, characterized in that, The first DC input bus (10) is fixed on the second base (13); And / or, the first DC input bus (10) includes an input terminal.

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