Direct current filter capable of rapidly adjusting capacitance

Abstract

The utility model discloses a direct current filter capable of rapidly adjusting capacitance, which comprises a laminated busbar assembly, and the laminated busbar assembly comprises an anode copper bar and a cathode copper bar insulated from the anode copper bar. The filtering assembly and the laminated busbar assembly are arranged at intervals, the filtering assembly comprises a capacitor, and the capacitor is electrically connected with the positive electrode copper bar and the negative electrode copper bar. According to the utility model, the current on the copper bar is provided for the PCB through the screw by arranging the laminated busbar assembly, and compared with the existing mode that the PCB is welded on the copper bar to take electricity, the power supply mode can simplify the processing technology of the direct current filter, and facilitates the subsequent modification of the PCB; meanwhile, the first pin and the second pin with certain height are arranged on the positive and negative copper bars, so that a gap is formed between the positive and negative copper bars and the PCB, the PCB can be quickly disassembled to adjust the capacitor on the PCB, and the capacitor needing to be adjusted at the edge of the PCB can be directly adjusted by utilizing the gap below the PCB; and the efficiency of adjusting the electromagnetic compatibility of the motor controller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle accessories, and specifically to a DC filter for quickly adjusting capacitance. Background Art

[0002] New energy vehicles are environmentally friendly and less polluting because they do not burn gasoline to generate power. They have a core component, the motor controller, which is used to convert the DC power output by the battery into a three-phase AC power supply and drive the motor to rotate. The DC filter inside the motor controller can filter the high-frequency noise of the input DC power, thereby improving the DC power output by the battery. Among them, electromagnetic compatibility is the key point that the motor controller needs to consider, which means that the device or system can work normally in its electromagnetic environment and will not cause unacceptable electromagnetic interference to any other device in the environment. At the same time, it has a certain immunity to electromagnetic disturbances in the environment.

[0003] When the electromagnetic compatibility of the motor controller has problems, it will seriously affect the operation of the tram. Usually, the DC filter is adjusted to adjust the electromagnetic compatibility, and the capacitor on the PCB needs to be adjusted to recalibrate the electromagnetic compatibility. The PCB of the existing DC filter is welded to the copper busbar for power supply, and the copper busbar is fixed to the plastic shell formed by the mold. When adjusting the capacitor, the PCB welded on the copper busbar needs to be separated. The separation process often damages the PCB and makes it ineffective. Therefore, when adjusting the electromagnetic compatibility of the existing DC filter, it is often necessary to replace the new PCB, which is time-consuming, labor-intensive and costly. Utility Model Content

[0004] The utility model provides a DC filter for quickly adjusting the capacitance to solve the problem that the cost of adjusting the capacitance on the PCB board of the existing motor controller is too high. The specific technical solution is as follows:

[0005] A DC filter for fast capacitance adjustment comprises: a stacked busbar assembly, the stacked busbar assembly comprises a positive copper bar and a negative copper bar insulated from the positive copper bar; a filter assembly spaced apart from the stacked busbar assembly, the filter assembly comprises a PCB board and screws, the PCB board is electrically connected to the positive copper bar and the negative copper bar through the screws.

[0006] Furthermore, the PCB board power interface corresponds to the positive pin and the negative pin respectively; the screws connect the PCB board power interface to the positive pin and the negative pin respectively.

[0007] Furthermore, the positive copper busbar is provided with a positive pin, and the interval between the upper end surface of the positive pin and the upper surface of the positive copper busbar is A; the negative copper busbar is provided with a negative pin, and the interval between the upper end surface of the negative pin and the upper surface of the negative copper busbar is B.

[0008] Preferably, the stacked busbar assembly also includes: insulating paper arranged between the positive copper bar and the negative copper bar; and input pins and output pins electrically connected to the positive copper bar and the negative copper bar respectively, the input pins and the output pins are divided into positive and negative poles, and also includes a DC power supply electrically connected to the input pins.

[0009] Preferably, an annular magnetic ring is provided between the stacked busbar assembly and the filter assembly, and the distance between the upper surface of the magnetic ring and the stacked busbar assembly is C;

[0010] Preferably, the capacitor and the magnetic ring together form a CLC filter circuit, A=B, and A is larger than C by 1-5 mm.

[0011] It can be seen from the above technical solution that the utility model has the following beneficial effects:

[0012] The utility model provides the current on the copper busbar to the PCB board through screws by arranging a stacked busbar assembly. Compared with the existing PCB board being welded on the copper busbar to obtain power, this power supply method can simplify the processing technology of the DC filter and is also convenient for subsequent modification of the PCB board. At the same time, the first and second pins with a certain height are arranged on the positive and negative copper busbars, and the PCB board is connected to the positive and negative copper busbars by screws, so that a gap is arranged between the positive and negative copper busbars and the PCB board, which not only can quickly disassemble the PCB board to adjust the capacitance thereon, but also the capacitance on the edge of the PCB board that needs to be adjusted can be directly adjusted by using the gap under the PCB board, thereby improving the efficiency of adjusting the capacitance of the PCB board, and further improving the efficiency of adjusting the electromagnetic compatibility of the motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an exploded view of an embodiment of the utility model;

[0014] Figure 2 It is a top view of an embodiment of the utility model;

[0015] Figure 3 This is the filter circuit diagram of the utility model.

[0016] In the figure: 1. Plastic base; 2. Stacked busbar assembly; 3. Magnetic ring; 4. Filter assembly; 5. Filter circuit; 6. DC power supply; 21. Positive copper busbar; 22. Negative copper busbar; 23. Insulation paper; 24. Input pin; 25. Output pin; 26. Positive pin; 27. Negative pin; 41. PCB board; 42. Capacitor; 43. Screw. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] In the description of the embodiments of the present invention, it should be noted that the terms "inside", "outside", "upper", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1 As shown, an embodiment of the utility model includes a stacked busbar assembly 2, and a filter assembly 4 is electrically connected above the stacked busbar assembly 2. The filter assembly 4 includes a metal screw 43, and the screw 43 fixes the filter assembly 4 and the stacked busbar assembly 2 to the plastic base 1 below the stacked busbar assembly 2 through a threaded connection.

[0020] Among them, the stacked busbar assembly 2 includes a positive copper bar 21 and a negative copper bar 22, which can be designed as thin copper bars placed parallel to each other, or can be arranged as special-shaped structures. An open circuit is formed between the positive copper bar 21 and the negative copper bar through the insulating paper 23, thereby forming a plate-type capacitor 42, which can filter out part of the high-frequency interference, and the positive copper bar 21 and the negative copper bar 22 are formed with positive and negative input pins 24 at the left ends for connecting to the DC power supply 6, and the positive copper bar 21 and the negative copper bar 22 are also formed with positive and negative output pins 25 at the right ends for connecting to the thin film capacitor 42.

[0021] like Figure 2 As shown, two groups of positive pins 26 and negative pins 27 with a height of A and a height of B are respectively extended from the edges of the positive copper bar 21 and the negative copper bar 22. The positive pins 26 and the negative pins 27 can connect the current of the DC power supply 6 to the filter component 4 through the screws 43. In this embodiment, A=B, so that the positive copper bar 21 and the negative copper bar 22 are parallel to the filter component 4 and the interval is A, which is convenient for adjusting the components on the filter component 4. In addition, an annular magnetic ring 3 is placed in the gap. The magnetic ring 3 is sleeved on the positive and negative copper bars, and the distance between its upper surface and the upper surface of the positive and negative copper bars is C. In this embodiment, A=C+4, and the magnetic ring 3 can resist interference through its own magnetic field and play a role similar to that of an inductor.

[0022] like Figure 3 As shown, the filter component 4 includes a PCB board 41 placed in parallel with the positive copper bus 21 and the negative copper bus 22 at an interval A. The lower surface of the PCB board 41 is connected to the two groups of positive pins 26 and the negative pins 27 by screws 43. It can act as two groups of power supplies providing DC, and then provide current to the two groups of capacitors 42 welded on the PCB board 41, so that the two groups of capacitors 42 form a filter circuit 5. The filter circuit 5 can smooth voltage fluctuations, filter high-frequency noise, and improve electromagnetic compatibility.

[0023] In this embodiment, the DC power supply 6 inputs current through the input pin 24, the current flows through the positive copper bus 21 and the negative copper bus 22, and provides current to the PCB board 41 through two sets of positive pins 26 and negative pins 27. The current of the PCB board 41 flows through the filter circuit 5, and the filtered current is output from the output pin 25, so that stable, low-noise, high-quality DC power is provided to the film capacitor 42, thereby facilitating the subsequent conversion of DC power into AC power.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0025] The technology, shape, and structural parts not described in detail in the present utility model are all well-known technologies. Although the embodiments of the present utility model have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model, and the scope of the present utility model is defined by the attached claims and their equivalents.

[0026] The technology, shape and structure parts not described in detail in the present invention are all known technologies.

Claims

1. A DC filter with fast capacitance adjustment, characterized in that: include: A stacked busbar assembly (2), the stacked busbar assembly (2) comprising a positive copper bar (21) and a negative copper bar (22) insulated from the positive copper bar (21); A filter assembly (4) is arranged at a distance from the stacked busbar assembly (2), the filter assembly (4) comprising a screw (43) and a PCB board (41), the PCB board (41) being electrically connected to the positive copper busbar (21) and the negative copper busbar (22) via the screw (43).

2. The DC filter according to claim 1, characterized in that: The positive copper busbar (21) is provided with a positive pin (26), and the interval between the upper end surface of the positive pin (26) and the upper surface of the positive copper busbar (21) is A; the negative copper busbar (22) is provided with a negative pin (27), and the interval between the upper end surface of the negative pin (27) and the upper surface of the negative copper busbar (22) is B.

3. The DC filter according to claim 2, characterized in that: The power interface of the PCB board (41) corresponds to the positive electrode pin (26) and the negative electrode pin (27) respectively; the screw (43) connects the power interface of the PCB board (41) to the positive electrode pin (26) and the negative electrode pin (27) respectively.

4. The DC filter according to claim 1, characterized in that: The stacked busbar assembly (2) further comprises: Insulating paper (23) disposed between the positive electrode copper busbar (21) and the negative electrode copper busbar (22); and An input pin (24) and an output pin (25) are electrically connected to the positive copper busbar (21) and the negative copper busbar (22) respectively, and the input pin (24) and the output pin (25) are divided into positive and negative poles.

5. The DC filter according to claim 4, characterized in that: It also includes a direct current power source (6) electrically connected to the input pin (24).

6. The DC filter according to claim 2, characterized in that: An annular magnetic ring (3) is arranged between the stacked busbar assembly (2) and the filter assembly (4), and the distance between the upper surface of the magnetic ring (3) and the stacked busbar assembly (2) is C; The filter assembly (4) comprises a capacitor (42) arranged on a side of the PCB board (41) away from the stacked busbar assembly (2), and the capacitor (42) is electrically connected to the PCB board (41).

7. The DC filter according to claim 6, characterized in that: The capacitor (42) and the magnetic ring (3) together form a CLC filter circuit (5).

8. The DC filter according to claim 7, characterized in that: A=B, and A is 1-5mm larger than C.

9. The DC filter according to claim 1, characterized in that: It also comprises a plastic base (1), which provides a support for the stacked busbar assembly (2).

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