A filter circuit board for a DC power supply, a DC power supply and a filter device thereof

Abstract

The utility model discloses a filter circuit board of a DC power supply, a DC power supply and a filter device thereof, and belongs to the field of power supply filtering. Considering that a plurality of capacitors can be arranged on the same plane through the circuit board, and the operation of connecting the circuit board with the DC power supply is relatively simple, in the filter circuit board of the utility model, the positive output row of the DC power supply can be electrically connected to the first conductive device of the circuit board through the first connecting hole, the negative output row of the DC power supply can be electrically connected to the second conductive device of the circuit board through the second connecting hole, the ground frame of the DC power supply can be electrically connected to the third conductive device of the circuit board through the third connecting hole, and the corresponding filter capacitor of the DC power supply can be arranged through the capacitor mounting holes on each conductive device, so that each filter capacitor is arranged on the filter circuit board, the space occupied by the filter capacitor is reduced, and the installation efficiency of the filter capacitor is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supply filtering, in particular to a filtering circuit board of a direct current power supply, a direct current power supply and a filtering device thereof. Background Art

[0002] In order to filter out the AC component, ripple noise and high-frequency interference of the DC power output by the DC power supply, several capacitors (such as DC filter capacitors and ground filter capacitors) are usually installed in the DC power supply. However, several capacitors usually take up a large space and the installation efficiency is usually low.

[0003] Therefore, how to provide a solution to the above technical problems is a problem that those skilled in the art need to solve at present. Utility Model Content

[0004] The purpose of the utility model is to provide a filtering circuit board of a DC power supply, a DC power supply and a filtering device thereof. In the filtering circuit board of the utility model, the positive output row of the DC power supply can be electrically connected to the first conductive device of the circuit board through the first connecting hole, the negative output row of the DC power supply can be electrically connected to the second conductive device of the circuit board through the second connecting hole, and the grounding frame of the DC power supply can be electrically connected to the third conductive device of the circuit board through the third connecting hole. The corresponding filtering capacitors of the DC power supply can be arranged through the capacitor mounting holes on each conductive device, so that each filtering capacitor is arranged on the filtering circuit board, which reduces the space occupied by the filtering capacitor and improves the installation efficiency of the filtering capacitor.

[0005] In order to solve the above technical problems, the utility model provides a filter circuit board for a DC power supply, comprising:

[0006] Circuit board substrate;

[0007] A first conductive device, a second conductive device and a third conductive device arranged on the circuit board substrate are all used for conducting electricity;

[0008] A first connection hole provided on the first conductive device, for establishing an electrical connection between the first conductive device and the positive output row of the DC power supply;

[0009] A second connection hole provided on the second conductive device, for establishing electrical connection between the second conductive device and the negative output row of the DC power supply;

[0010] A third connection hole provided on the third conductive device, for establishing an electrical connection between the third conductive device and a ground frame of the DC power supply;

[0011] Capacitor mounting holes provided on the first conductive device, the second conductive device and the third conductive device, for establishing electrical connection between the filter capacitor and the corresponding conductive device;

[0012] Wherein, the conductive device includes the first conductive device, the second conductive device and the third conductive device.

[0013] On the other hand, the first conductive device is provided with a first capacitor mounting hole and a second capacitor mounting hole;

[0014] The first capacitor mounting hole is used to establish an electrical connection between the first conductive device and the first end of the DC filter capacitor; the second capacitor mounting hole is used to establish an electrical connection between the first conductive device and the first end of the first ground filter capacitor;

[0015] The second conductive device is provided with a third capacitor mounting hole and a fourth capacitor mounting hole;

[0016] The third capacitor mounting hole is used to establish an electrical connection between the second conductive device and the second end of the DC filter capacitor; the fourth capacitor mounting hole is used to establish an electrical connection between the second conductive device and the first end of the second ground filter capacitor;

[0017] The third conductive device is provided with a fifth capacitor mounting hole;

[0018] The fifth capacitor mounting hole is used to establish an electrical connection between the third conductive device and the ground filter capacitor;

[0019] The ground filter capacitor includes the first ground filter capacitor and the second ground filter capacitor, and the capacitor mounting holes include the first capacitor mounting hole, the second capacitor mounting hole, the third capacitor mounting hole, the fourth capacitor mounting hole and the fifth capacitor mounting hole.

[0020] On the other hand, the third connection hole includes a first sub-connection hole and a second sub-connection hole;

[0021] The first sub-connection hole is used to establish an electrical connection between the third conductive device and the positive grounding frame of the DC power supply, and the second sub-connection hole is used to establish an electrical connection between the third conductive device and the negative grounding frame of the DC power supply;

[0022] The fifth capacitor mounting hole includes a first sub-mounting hole and a second sub-mounting hole;

[0023] The first sub-mounting hole is used to establish an electrical connection between the third conductive device and the first ground-to-ground filter capacitor, and the second sub-mounting hole is used to establish an electrical connection between the third conductive device and the second ground-to-ground filter capacitor.

[0024] On the other hand, there are multiple first capacitor mounting holes and multiple third capacitor mounting holes;

[0025] The number of the first capacitor mounting holes and the number of the third capacitor mounting holes are equal.

[0026] On the other hand, the filter circuit board further comprises an auxiliary mounting hole provided on the circuit board substrate;

[0027] The auxiliary mounting hole is used to fix the circuit board substrate to the frame of the DC power supply.

[0028] On the other hand, the circuit board substrate is rectangular;

[0029] The fifth capacitor mounting hole and the auxiliary mounting hole are arranged in a one-to-one correspondence at a right angle position of the circuit board substrate.

[0030] On the other hand, the first conductive device, the second conductive device and the third conductive device are all copper foils.

[0031] On the other hand, it is used for heating power supply of single crystal furnace.

[0032] In order to solve the above technical problems, the utility model also provides a filtering device, including the filtering circuit board of the DC power supply as described above, and also including a filtering capacitor arranged on the filtering circuit board of the DC power supply.

[0033] In order to solve the above technical problems, the utility model also provides a DC power supply, including a DC power supply body, and also including the above-mentioned filtering device connected to the DC power supply body.

[0034] Beneficial effects: The utility model provides a filter circuit board for a DC power supply. Considering that a number of capacitors can be arranged on the same plane through the circuit board and the operation of connecting the circuit board with the DC power supply is relatively simple, in the filter circuit board of the utility model, the positive output row of the DC power supply can be electrically connected to the first conductive device of the circuit board through the first connecting hole, the negative output row of the DC power supply can be electrically connected to the second conductive device of the circuit board through the second connecting hole, and the grounding frame of the DC power supply can be electrically connected to the third conductive device of the circuit board through the third connecting hole. The corresponding filter capacitors of the DC power supply can be arranged through the capacitor mounting holes on each conductive device, so that each filter capacitor is arranged on the filter circuit board, which reduces the space occupied by the filter capacitor and improves the installation efficiency of the filter capacitor.

[0035] The utility model also provides a direct current power supply and a filtering device thereof, which have the same beneficial effects as the filtering circuit board of the direct current power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the relevant technologies and drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 A schematic diagram of the structure of a filter circuit board of a DC power supply provided by the utility model;

[0038] Figure 2 A schematic diagram of the structure of a filter circuit of a DC power supply provided by the utility model;

[0039] Figure 3 The present invention is a schematic structural diagram of another filter circuit board of a DC power supply provided by the present invention. DETAILED DESCRIPTION

[0040] The core of the utility model is to provide a filter circuit board of a DC power supply, a DC power supply and a filter device thereof. In the filter circuit board of the utility model, the positive output row of the DC power supply can be electrically connected to the first conductive device of the circuit board through the first connection hole, the negative output row of the DC power supply can be electrically connected to the second conductive device of the circuit board through the second connection hole, and the ground frame of the DC power supply can be electrically connected to the third conductive device of the circuit board through the third connection hole. The corresponding filter capacitor of the DC power supply can be arranged through the capacitor mounting holes on each conductive device, so that each filter capacitor is arranged on the filter circuit board, which reduces the space occupied by the filter capacitor and improves the installation efficiency of the filter capacitor.

[0041] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of 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.

[0042] Please refer to Figure 1 , Figure 1 The present invention provides a schematic diagram of the structure of a filter circuit board of a DC power supply, wherein the filter circuit board of the DC power supply comprises:

[0043] Circuit board substrate 1;

[0044] The first conductive device 2, the second conductive device 3 and the third conductive device 4 arranged on the circuit board substrate 1 are all used for conducting electricity;

[0045] A first connection hole 21 provided on the first conductive device 2, for establishing electrical connection between the first conductive device 2 and the positive output row of the DC power supply;

[0046] A second connection hole 31 provided on the second conductive device 3, for establishing electrical connection between the second conductive device 3 and the negative output row of the DC power supply;

[0047] A third connection hole 41 provided on the third conductive device 4 is used to establish an electrical connection between the third conductive device 4 and a ground frame of the DC power supply;

[0048] Capacitor mounting holes 5 are provided on the first conductive device 2, the second conductive device 3 and the third conductive device 4, and are used to establish electrical connection between the filter capacitor and the corresponding conductive device;

[0049] The conductive device includes a first conductive device 2 , a second conductive device 3 and a third conductive device 4 .

[0050] Specifically, taking into account the technical problems in the above background technology, and considering that a plurality of capacitors can be arranged on the same plane through a circuit board, and the operation of connecting the circuit board to a DC power supply is relatively simple, a filtering circuit board of a DC power supply is designed in an embodiment of the utility model, so that various filtering capacitors of the DC power supply can be arranged through the filtering circuit board, thereby reducing the space occupied by the filtering capacitor and the difficulty of installation.

[0051] Specifically, the filter circuit board of the DC power supply is first based on the circuit board substrate 1. Considering that each filter capacitor of the DC power supply is essentially related to the connection with the "positive output row, negative output row and ground frame of the DC power supply", the first conductive device 2, the second conductive device 3 and the third conductive device 4 are designed on the circuit board substrate 1 in the embodiment of the utility model. The first conductive device 2 can be electrically connected to the positive output row of the DC power supply through the first connecting hole 21 on the first conductive device 2, the second conductive device 3 can be electrically connected to the negative output row of the DC power supply through the second connecting hole 31 on the second conductive device 3, and the third conductive device 4 can be electrically connected to the ground frame of the DC power supply through the third connecting hole 41 on the third conductive device 4. At this point, it is equivalent to leading the positive output row, negative output row and ground frame of the DC power supply to the filter circuit board.

[0052] Among them, following the above “leading out the positive output row, negative output row and grounding frame of the DC power supply to the filter circuit board”, considering that the first conductive device 2, the second conductive device 3 and the third conductive device 4 are all arranged on the same plane of the circuit board substrate 1, by reserving relevant mounting holes on the first conductive device 2, the second conductive device 3 and the third conductive device 4, it is possible to support the convenient installation of each filter capacitor. Therefore, in the embodiment of the utility model, capacitor mounting holes 5 are provided on the first conductive device 2, the second conductive device 3 and the third conductive device 4, so that the filter circuit is electrically connected to the corresponding conductive device through the capacitor mounting holes 5, thereby finally achieving the purpose of connecting the filter capacitor to “the positive output row, negative output row and grounding frame of the DC power supply”.

[0053] Specifically, the capacitor mounting hole 5 can be flexibly arranged according to the "connection topology between the filter capacitor and the DC power supply body" and the "required number of filter capacitors", which is not limited in the embodiment of the utility model.

[0054] The utility model provides a filtering circuit board for a DC power supply. Considering that a plurality of capacitors can be arranged on the same plane through the circuit board, and the operation of connecting the circuit board with the DC power supply is relatively simple, in the filtering circuit board of the utility model, the positive output row of the DC power supply can be electrically connected to the first conductive device of the circuit board through the first connecting hole, the negative output row of the DC power supply can be electrically connected to the second conductive device of the circuit board through the second connecting hole, and the grounding frame of the DC power supply can be electrically connected to the third conductive device of the circuit board through the third connecting hole. The corresponding filtering capacitors of the DC power supply can be arranged through the capacitor mounting holes on each conductive device, so that each filtering capacitor is arranged on the filtering circuit board, which reduces the space occupied by the filtering capacitor and improves the installation efficiency of the filtering capacitor.

[0055] Based on the above embodiments:

[0056] As an optional embodiment, the first conductive device 2 is provided with a first capacitor mounting hole and a second capacitor mounting hole;

[0057] A first capacitor mounting hole, for establishing an electrical connection between the first conductive device 2 and the first end of the DC filter capacitor; a second capacitor mounting hole, for establishing an electrical connection between the first conductive device 2 and the first end of the first ground filter capacitor;

[0058] The second conductive device 3 is provided with a third capacitor mounting hole and a fourth capacitor mounting hole;

[0059] a third capacitor mounting hole, for establishing an electrical connection between the second conductive device 3 and the second end of the DC filter capacitor; a fourth capacitor mounting hole, for establishing an electrical connection between the second conductive device 3 and the first end of the second ground filter capacitor;

[0060] The third conductive device 4 is provided with a fifth capacitor mounting hole;

[0061] a fifth capacitor mounting hole, used to establish an electrical connection between the third conductive device 4 and the ground filter capacitor;

[0062] The ground filter capacitor includes a first ground filter capacitor and a second ground filter capacitor, and the capacitor mounting hole 5 includes a first capacitor mounting hole, a second capacitor mounting hole, a third capacitor mounting hole, a fourth capacitor mounting hole and a fifth capacitor mounting hole.

[0063] Specifically, in order to better illustrate the embodiments of the present invention, please refer to Figure 2 as well as Figure 3 , Figure 2 A schematic diagram of a filter circuit for a DC power supply provided by the utility model. Figure 3 A schematic diagram of the structure of another filter circuit board of a DC power supply provided by the utility model, Figure 2 In the figure, V+ is the positive output row of the DC power supply, V- is the negative output row of the DC power supply, C1 is a DC filter capacitor for filtering out AC components, and C2 and C3 are ground filter capacitors for filtering high-frequency noise.

[0064] Specifically, refer to Figure 2 As shown, the positive output row of the DC power supply can be connected to the DC filter capacitor and one of the ground filter capacitors, the negative output row of the DC power supply can be connected to the DC filter capacitor and the other ground filter capacitor, and the two ground filter capacitors are connected to the ground frame of the DC power supply. Therefore, in the embodiment of the utility model, corresponding capacitor mounting holes 5 are set on each conductive device, that is, the first conductive device 2 is provided with a first capacitor mounting hole and a second capacitor mounting hole, the second conductive device 3 is provided with a third capacitor mounting hole and a fourth capacitor mounting hole, and the third conductive device 4 is provided with a fifth capacitor mounting hole, so as to achieve the following Figure 2 The connections of the various filter capacitors are shown.

[0065] Among them, Figure 3A1 to A4 are installation positions of four DC filter capacitors. In each installation position of the DC filter capacitor (for example, A1), the installation hole located on the first conductive device 2 is the first capacitor installation hole, and the installation hole located on the second conductive device 3 is the third capacitor installation hole. A5 and A6 are installation positions of two ground filter capacitors; in the installation position of A5, the installation hole located on the second conductive device 3 is the fourth capacitor installation hole; in the installation position of A6, the installation hole located on the first conductive device 2 is the second capacitor installation hole; the installation hole located on the third conductive device 4 in A5 and the installation hole located on the third conductive device 4 in A6 are collectively used as the fifth capacitor installation hole.

[0066] As an optional embodiment, the third connection hole 41 includes a first sub-connection hole 411 and a second sub-connection hole 412;

[0067] The first sub-connection hole 411 is used to establish an electrical connection between the third conductive device 4 and the positive grounding frame of the DC power supply, and the second sub-connection hole 412 is used to establish an electrical connection between the third conductive device 4 and the negative grounding frame of the DC power supply;

[0068] The fifth capacitor mounting hole includes a first sub-mounting hole and a second sub-mounting hole;

[0069] The first sub-mounting hole is used to establish an electrical connection between the third conductive device 4 and the first ground-to-ground filter capacitor, and the second sub-mounting hole is used to establish an electrical connection between the third conductive device 4 and the second ground-to-ground filter capacitor.

[0070] Specifically, considering that the grounding of the DC power supply includes positive grounding and negative grounding, the third connection hole 41 in the embodiment of the utility model includes a first sub-connection hole 411 and a second sub-connection hole 412. The first sub-connection hole 411 is used to establish an electrical connection between the third conductive device 4 and the positive grounding frame of the DC power supply, and the second sub-connection hole 412 is used to establish an electrical connection between the third conductive device 4 and the negative grounding frame of the DC power supply; accordingly, the fifth capacitor mounting hole includes a first sub-mounting hole and a second sub-mounting hole. The first sub-mounting hole is used to establish an electrical connection between the third conductive device 4 and the first ground filter capacitor, and the second sub-mounting hole is used to establish an electrical connection between the third conductive device 4 and the second ground filter capacitor.

[0071] Among them, the first connection hole 21 and the second connection hole 31 can be PCB (Printed Circuit Board) welding terminals, and the first connection hole 21 and the second connection hole 31 can be connected to the positive output row and the negative output row of the DC power supply respectively through conductors (which can be copper busbars, etc.); the first sub-connection hole 411 and the second sub-connection hole 412 can be fixing holes with solder pads, which can be installed on the grounding frame of the DC power supply through metal screws and studs to achieve the functions of fixing and grounding.

[0072] As an optional embodiment, there are multiple first capacitor mounting holes and multiple third capacitor mounting holes;

[0073] The number of the first capacitor mounting holes and the number of the third capacitor mounting holes are equal.

[0074] Specifically, considering that multiple capacitors need to be connected in parallel as DC filter capacitors in some scenarios, there are multiple first capacitor mounting holes and third capacitor mounting holes in the embodiment of the utility model, and the number of the first capacitor mounting holes and the number of the third capacitor mounting holes are equal.

[0075] The number of the first capacitor mounting holes and the third capacitor mounting holes can be set independently, for example, Figure 3 The four shown are not limited in the embodiments of the present invention.

[0076] As an optional embodiment, the filter circuit board further includes an auxiliary mounting hole 6 provided on the circuit board substrate 1;

[0077] The auxiliary mounting hole 6 is used to fix the circuit board substrate 1 to the frame of the DC power supply.

[0078] Specifically, in order to make the filter circuit board and the frame of the DC power supply more tightly connected, the filter circuit board in the embodiment of the utility model is further provided with an auxiliary mounting hole 6, and the auxiliary mounting hole 6 can be insulated.

[0079] As an optional embodiment, the circuit board substrate 1 is rectangular;

[0080] The fifth capacitor mounting hole and the auxiliary mounting hole 6 are arranged in a one-to-one correspondence at a right angle position of the circuit board substrate 1 .

[0081] Specifically, the rectangular circuit board substrate 1 has a lower cost, and the fifth capacitor mounting hole and the auxiliary mounting hole 6 are arranged one by one at a right angle position of the circuit board substrate 1, which can make the filter circuit board more tightly connected to the frame of the DC power supply.

[0082] Of course, in addition to this specific form, the shape of the circuit board substrate 1 and the "layout positions of the fifth capacitor mounting hole and the auxiliary mounting hole 6" may also be other forms, and the embodiments of the present utility model are not limited here.

[0083] As an optional embodiment, the first conductive device 2 , the second conductive device 3 and the third conductive device 4 are all copper foils.

[0084] Specifically, copper foil has advantages such as good conductivity and long life.

[0085] Of course, in addition to copper foil, the first conductive device 2 , the second conductive device 3 and the third conductive device 4 may also be of other types, which is not limited in the embodiment of the present utility model.

[0086] As an optional embodiment, it is applied to the heating power supply of a single crystal furnace.

[0087] Specifically, considering that there are many filter capacitors in the heating power supply of the single crystal furnace, in order to reduce the installation space and installation difficulty of the filter capacitors in the heating power supply of the single crystal furnace, the filter circuit board in the embodiment of the utility model can be applied to the heating power supply of the single crystal furnace.

[0088] Of course, in addition to the heating power supply of the single crystal furnace, the filter circuit board can also be used in many other scenarios, which are not limited in the embodiments of the present utility model.

[0089] The utility model also provides a filtering device, comprising a filtering circuit board of a DC power supply as in the aforementioned embodiment, and also comprising a filtering capacitor arranged on the filtering circuit board of the DC power supply.

[0090] For the introduction of the filter device provided in the embodiment of the present utility model, please refer to the embodiment of the filter circuit board of the DC power supply mentioned above, and the embodiment of the present utility model will not be described in detail here.

[0091] The utility model also provides a direct current power supply, comprising a direct current power supply body, and also comprising a filtering device as in the above-mentioned embodiment connected to the direct current power supply body.

[0092] For an introduction to the DC power supply provided in the embodiment of the present utility model, please refer to the aforementioned embodiment of the filter circuit board of the DC power supply, and the embodiment of the present utility model will not be described in detail here.

[0093] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other. It should also be noted that in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the element.

[0094] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A filter circuit board for a DC power supply, characterized in that: include: Circuit board substrate; A first conductive device, a second conductive device and a third conductive device arranged on the circuit board substrate are all used for conducting electricity; A first connection hole provided on the first conductive device, for establishing an electrical connection between the first conductive device and the positive output row of the DC power supply; A second connection hole provided on the second conductive device, for establishing electrical connection between the second conductive device and the negative output row of the DC power supply; A third connection hole provided on the third conductive device, for establishing an electrical connection between the third conductive device and a ground frame of the DC power supply; Capacitor mounting holes provided on the first conductive device, the second conductive device and the third conductive device, for establishing electrical connection between the filter capacitor and the corresponding conductive device; Wherein, the conductive device includes the first conductive device, the second conductive device and the third conductive device.

2. The filter circuit board of the DC power supply according to claim 1, characterized in that: The first conductive device is provided with a first capacitor mounting hole and a second capacitor mounting hole; The first capacitor mounting hole is used to establish an electrical connection between the first conductive device and the first end of the DC filter capacitor; the second capacitor mounting hole is used to establish an electrical connection between the first conductive device and the first end of the first ground filter capacitor; The second conductive device is provided with a third capacitor mounting hole and a fourth capacitor mounting hole; The third capacitor mounting hole is used to establish an electrical connection between the second conductive device and the second end of the DC filter capacitor; the fourth capacitor mounting hole is used to establish an electrical connection between the second conductive device and the first end of the second ground filter capacitor; The third conductive device is provided with a fifth capacitor mounting hole; The fifth capacitor mounting hole is used to establish an electrical connection between the third conductive device and the ground filter capacitor; The ground filter capacitor includes the first ground filter capacitor and the second ground filter capacitor, and the capacitor mounting holes include the first capacitor mounting hole, the second capacitor mounting hole, the third capacitor mounting hole, the fourth capacitor mounting hole and the fifth capacitor mounting hole.

3. The filter circuit board of the DC power supply according to claim 2, characterized in that: The third connection hole includes a first sub-connection hole and a second sub-connection hole; The first sub-connection hole is used to establish an electrical connection between the third conductive device and the positive grounding frame of the DC power supply, and the second sub-connection hole is used to establish an electrical connection between the third conductive device and the negative grounding frame of the DC power supply; The fifth capacitor mounting hole includes a first sub-mounting hole and a second sub-mounting hole; The first sub-mounting hole is used to establish an electrical connection between the third conductive device and the first ground-to-ground filter capacitor, and the second sub-mounting hole is used to establish an electrical connection between the third conductive device and the second ground-to-ground filter capacitor.

4. The filter circuit board of the DC power supply according to claim 2, characterized in that: There are multiple first capacitor mounting holes and multiple third capacitor mounting holes; The number of the first capacitor mounting holes and the number of the third capacitor mounting holes are equal.

5. The filter circuit board of the DC power supply according to claim 2, characterized in that: The filter circuit board also includes an auxiliary mounting hole provided on the circuit board substrate; The auxiliary mounting hole is used to fix the circuit board substrate to the frame of the DC power supply.

6. The filter circuit board of the DC power supply according to claim 5, characterized in that: The circuit board substrate is rectangular; The fifth capacitor mounting hole and the auxiliary mounting hole are arranged in a one-to-one correspondence at a right angle position of the circuit board substrate.

7. The filter circuit board of the DC power supply according to claim 1, characterized in that: The first conductive device, the second conductive device and the third conductive device are all copper foils.

8. The filter circuit board of a DC power supply according to any one of claims 1 to 7, characterized in that: Applied to the heating power supply of single crystal furnace.

9. A filtering device, characterized in that: A filter circuit board of a DC power supply comprising the filter circuit board of any one of claims 1 to 8, and further comprising a filter capacitor arranged on the filter circuit board of the DC power supply.

10. A DC power supply, characterized in that: It comprises a DC power supply body and also comprises a filtering device as claimed in claim 9 connected to the DC power supply body.

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