Low-inductance capacitor and circuit system

Abstract

The utility model provides a low inductance capacitor and circuit system relates to capacitor technical field, low inductance capacitor includes main part, first electrode and second electrode, said first electrode and said second electrode have the same size, the central axis of first electrode and the central axis of second electrode are mutually parallel, said first electrode and said second electrode are mutually parallel, said first electrode and said second electrode are mutually parallel, said first electrode and said second electrode are mutually parallel, said first electrode and said second electrode are mutually parallel. And the first electrode and the second electrode are electrically connected with the main body. The first electrode and the second electrode which are electrically connected with the main body are arranged on the main body of the capacitor, the positive electrode and the negative electrode of the capacitor are led out respectively, the first electrode and the second electrode are identical in shape and size, and the central axis of the first electrode and the central axis of the second electrode are parallel to each other. According to the right-hand spiral rule, magnetic induction lines generated by the first electrode and the second electrode can offset each other to a great extent, so that the inductance of the capacitor is reduced.

Description

Technical Field

[0001] This utility model relates to the field of capacitor technology, and more specifically, to a low-inductance capacitor and circuit system. Background Technology

[0002] Capacitors are widely used in wireless communication, radio frequency identification (RFID), radar systems, and other high-frequency electronic devices. They play a role in filtering, coupling, and decoupling in circuits, effectively processing high-frequency signals. With the development of technology, some circuit systems, such as those used in three-level platforms in rail transit systems, have higher frequency requirements for capacitors. For common DC support capacitors, the typical ripple current frequency is 50Hz, but the capacitors used in three-level platform circuit systems for rail transit systems require a frequency of 36kHz. Since the resonant frequency is inversely proportional to the inductance, this necessitates that the capacitor have extremely low inductance. Utility Model Content

[0003] The problem to be solved by this invention is to provide a low-inductance capacitor.

[0004] Therefore, this utility model provides a low-inductance capacitor, including a main body, a first electrode and a second electrode. The first electrode and the second electrode are the same size, the central axis of the first electrode and the central axis of the second electrode are parallel to each other, and both the first electrode and the second electrode are electrically connected to the main body.

[0005] Optionally, the low-inductance capacitor further includes a first electrode and a second electrode that are parallel to each other. The first electrode is connected to the side of the first electrode away from the second electrode, and the second electrode is connected to the side of the second electrode close to the first electrode. A connection hole is formed on the first electrode, and the second electrode passes through the connection hole. Both the first electrode and the second electrode are electrically connected to the main body.

[0006] Optionally, the main body includes a core and a first connecting piece. The core includes a plurality of arrayed elements, one side of the plurality of elements is connected to the second electrode plate, the other side of the plurality of elements is connected to the first connecting piece, and the first electrode plate is electrically connected to the side of the first connecting piece away from the elements.

[0007] Optionally, the main body further includes a second connecting piece, which has a U-shaped structure. The inner walls of one side of the two second connecting pieces are respectively connected to the two ends of the side of the first connecting piece away from the core along the width direction, and the inner walls of the other side of the two second connecting pieces are respectively connected to the two ends of the first electrode plate along the width direction.

[0008] Optionally, all of the components are soldered onto the first connecting piece.

[0009] Optionally, the main body further includes two first insulating plates, one of which is disposed between a second connecting piece and the core, and the other of which is disposed between another second connecting piece and the core.

[0010] Optionally, the main body further includes a second insulating plate, which is disposed between the first electrode plate and the second electrode plate. The second insulating plate has a through hole for the second electrode to pass through. An upwardly extending insulating ring is provided on the wall of the through hole. The second electrode passes through the through hole and the connecting hole. The insulating ring is located between the wall of the connecting hole and the peripheral surface of the second electrode.

[0011] Optionally, the second insulating plate is made of epoxy resin.

[0012] Optionally, there are multiple first electrodes and multiple second electrodes, and the multiple first electrodes and multiple second electrodes are connected in an array on the main body.

[0013] Compared with the prior art, the beneficial effects of the low-inductance capacitor of this invention are:

[0014] This invention provides a first electrode and a second electrode electrically connected to the main body of a capacitor, which respectively lead out the positive and negative terminals of the capacitor. The first electrode and the second electrode have the same shape and size, and the central axes of the first electrode and the second electrode are parallel to each other, so that the current flowing through the first electrode and the second electrode is the same in magnitude and opposite in direction. According to the right-hand screw rule, the magnetic field lines generated by the first electrode and the second electrode can largely cancel each other out, thereby reducing the inductance of the capacitor.

[0015] In addition, to solve the above problems, this utility model also provides a circuit system including the aforementioned low-inductance capacitor.

[0016] Compared with the prior art, the beneficial effects of the circuit system described in this utility model are roughly the same as those of the low-inductance capacitor mentioned above, and will not be repeated here. Attached Figure Description

[0017] Figure 1 This is a top view of the structural schematic diagram of the low-inductance capacitor described in an embodiment of the present invention;

[0018] Figure 2 This is a side view of the structural schematic diagram of the low-inductance capacitor described in an embodiment of the present invention;

[0019] Figure 3 This is a bottom view of the structure of the low-inductance capacitor described in an embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures:

[0021] 11-First electrode; 12-Second electrode; 131-First electrode plate; 132-Second electrode plate; 2-Core; 21-Component; 3-First connecting piece; 4-Second connecting piece; 5-First insulating plate; 6-Second insulating plate. Detailed Implementation

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0023] It should be noted that in the description of this utility model, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "top", "bottom", "front", "back", "inner" and "outer" is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this utility model, and is not intended to indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the scope of protection of this utility model.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0025] Furthermore, although specific embodiments have been described herein with reference to them, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. Therefore, it should be understood that many modifications can be made to the exemplary embodiments, and other arrangements can be designed without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that different dependent claims and features herein can be combined in ways not used as described in the original claims. It is also understood that features described in conjunction with individual embodiments can be used in other embodiments.

[0026] To solve the above problems, such as Figures 1 to 3 As shown, this utility model provides a low-inductance capacitor, including a main body, a first electrode 11 and a second electrode 12. The first electrode 11 and the second electrode 12 have the same shape and size. The central axis of the first electrode 11 and the central axis of the second electrode 12 are parallel to each other. Both the first electrode 11 and the second electrode 12 are electrically connected to the main body.

[0027] In this embodiment, a first electrode 11 and a second electrode 12 electrically connected to the main body of the capacitor are provided on the main body to lead out the positive and negative terminals of the capacitor, respectively. The first electrode 11 and the second electrode 12 have the same shape and size, and the central axis of the first electrode 11 and the central axis of the second electrode 12 are parallel to each other, so that the current flowing through the first electrode 11 and the second electrode 12 is the same in magnitude and opposite in direction. According to the right-hand screw rule, the magnetic field lines generated by the first electrode 11 and the second electrode 12 can largely cancel each other out, thereby reducing the inductance of the capacitor.

[0028] Specifically, according to the formula

[0029] Where f is the resonant frequency, L is the inductance, and C is the capacitance, it can be seen that the resonant frequency of the capacitor is inversely proportional to the inductance. Reducing the inductance of the capacitor can increase the resonant frequency and prevent the capacitor from resonating with the circuit system; both the first electrode 11 and the second electrode 12 can be circular structures.

[0030] Optionally, such as Figure 2 As shown, the low-inductance capacitor also includes a first electrode 131 and a second electrode 132 that are parallel to each other. The first electrode 11 is connected to the side of the first electrode 131 away from the second electrode 132, and the second electrode 12 is connected to the side of the second electrode 132 close to the first electrode 131. A connection hole is provided on the first electrode 131, and the second electrode 12 passes through the connection hole. Both the first electrode 131 and the second electrode 132 are electrically connected to the main body.

[0031] In this embodiment, a first electrode plate 131 is connected below the first electrode 11, and the first electrode 11 and the first electrode plate 131 are integrally formed. Correspondingly, a second electrode plate 132 is connected below the second electrode 12, and the second electrode 12 and the second electrode plate 132 are integrally formed. A connection hole is opened on the first electrode 11 for the second electrode 12 to pass through. The second electrode 12 passes through the connection hole from below the first electrode plate 131. Both the first electrode plate 131 and the second electrode plate 132 are electrically connected to the main body, so that the first electrode 11 and the second electrode 12 can be simultaneously set on the same side of the main body, which facilitates the connection of the capacitor to an external circuit.

[0032] Optionally, such as Figure 2 and Figure 3 As shown, the main body includes a core 2 and a first connecting piece 3. The core 2 includes a plurality of arrayed elements 21. One side of the plurality of elements 21 is connected to the second electrode plate 132, and the other side of the plurality of elements 21 is connected to the first connecting piece 3. The first electrode plate 131 is electrically connected to the side of the first connecting piece 3 away from the elements 21.

[0033] In this embodiment, the main body of the capacitor includes a core 2, which includes multiple arrayed elements 21. Specifically, by providing a first connecting piece 3, multiple elements 21 are connected to one side of the first connecting piece 3, making it easy to connect multiple elements 21 into a whole. The other side of the first connecting piece 3 is electrically connected to the first electrode plate 131, thereby enabling the first electrode plate 131 to be electrically connected to multiple elements 21 through the first connecting piece 3. The side of multiple elements 21 away from the first connecting piece 3 is connected to the second electrode plate 132, allowing current to flow through the first electrode 11, the first electrode plate 131, the first connecting piece 3, the elements 21, the second electrode plate 132, and the second electrode 12, electrically connecting the first electrode 11, the second electrode 12, and the main body.

[0034] Specifically, the core 2 may include 21 elements 21 arranged in three rows and seven columns, and the elements 21 are made of two layers of metallized polypropylene film wound together.

[0035] Optionally, such as Figures 1 to 3 As shown, the main body also includes a second connecting piece 4, which has a U-shaped structure. The inner walls of one side of the two second connecting pieces 4 are respectively connected to the two ends of the side of the first connecting piece 3 facing away from the core 2 along the width direction, and the inner walls of the other side of the two second connecting pieces 4 are respectively connected to the two ends of the first electrode plate 131 along the width direction.

[0036] In this embodiment, by setting a second connecting piece 4, which is a U-shaped structure with the opening of the U-shape facing horizontally, the lower inner walls of the two second connecting pieces 4 are respectively connected to the two ends of the lower surface of the first connecting piece 3 along the width direction, and the upper inner walls of the two second connecting pieces 4 are respectively connected to the two ends of the first electrode plate 131 along the width direction, so that the two second connecting pieces 4 are fastened to the two ends of the core 2 along the width direction. The first electrode plate 131 is connected to the first connecting piece 3 through the second connecting pieces 4, so that the current can flow through the first electrode 11, the first electrode plate 131, the second connecting piece 4, the first connecting piece 3, the element 21, the second electrode plate 132, and the second electrode 12. The current flows from the first electrode 11 to the first connecting piece 3 and the element 21 along the second connecting pieces 4 at both ends of the width direction of the core 2. Compared with using one second connecting piece 4 for single-sided connection, using two connecting pieces 2 increases the overall area of ​​the connecting pieces, improves the heat dissipation effect, increases the composite degree of the first connecting piece 3 and the second connecting piece 4, that is, the overlap area, reduces the inductance, reduces the resistance, thereby reducing the heat generated during the use of the capacitor and improving the service life of the capacitor.

[0037] Optionally, all of the components 21 are soldered onto the first connecting piece 3.

[0038] In this embodiment, by welding multiple components 21 onto the first connecting plate, the multiple components 21 are easily electrically connected into a whole.

[0039] Optionally, such as Figure 1 and Figure 2 As shown, the main body also includes two first insulating plates 5, one of which is disposed between a second connecting piece 4 and the core 2, and the other of which is disposed between another second connecting piece 4 and the core 2.

[0040] In this embodiment, a first insulating plate 5 is provided between the second connecting piece 4 and the core 2. There are two first insulating plates 5 and two connecting pieces 4. The first insulating plate 5 can be an L-shaped structure. The horizontal end of the L-shaped structure is located between the upper surface of the core 2 and the side wall of the second connecting piece 4 located above the core 2. The vertical end of the L-shaped structure is located between the side wall of the core 2 and the bottom wall of the second connecting piece 4. Since the lower side wall of the second connecting piece 4 and the lower surface of the core 2 are the first connecting piece 3, the second connecting piece 4 and the core 2 do not contact each other. The two first insulating plates 5 are respectively provided between the two second connecting pieces 4 and the core 2, which insulates the second connecting piece 4 from the core 2 and prevents the current from flowing directly from the second connecting piece 4 to the component 21 adjacent to the second connecting piece 4, and thus preventing the current from flowing to all components 21.

[0041] Optionally, such as Figure 1 and Figure 2 As shown, the main body also includes a second insulating plate 6, which is disposed between the first electrode plate 131 and the second electrode plate 132. The second insulating plate 6 has a through hole for the second electrode 12 to pass through. An upwardly extending insulating ring is provided on the hole wall of the through hole. The second electrode 12 passes through the through hole and the connecting hole. The insulating ring is located between the hole wall of the connecting hole and the peripheral surface of the second electrode 12.

[0042] In this embodiment, a second insulating plate 6 is provided, on which through holes are formed for the second electrode 12 to pass through. The number and position of the through holes correspond to the number and position of the second electrodes 12. The second insulating plate 6 is disposed between the first electrode plate 131 and the second electrode plate 132, and an upwardly extending insulating ring is provided on the hole wall of the through hole. The insulating ring can extend into the through hole. When the second electrode 12 passes through the through hole and the connecting hole in sequence, the insulating ring is located between the hole wall of the connecting hole and the peripheral surface of the second electrode 12, isolating the second electrode 12 from the first electrode plate 131, realizing the separation of the first electrode 11 and the second electrode 12, preventing the current from flowing directly from the first electrode 11 to the second electrode 12, causing the capacitor to fail, and playing the role of insulating the first electrode 11 and the second electrode 12.

[0043] Optionally, the second insulating plate 6 is made of epoxy resin.

[0044] In this embodiment, the second insulating plate 6 is manufactured by using epoxy resin. Epoxy resin has insulating properties, which facilitates the second insulating plate 6 to insulate the first electrode 11 and the second electrode 12.

[0045] Specifically, the first insulating plate 5 is also supported by epoxy resin, which facilitates the insulation of the second connecting piece 4 with the core 2.

[0046] Optionally, such as Figure 1 As shown, there are multiple first electrodes 11 and multiple second electrodes 12, and the multiple first electrodes 11 and multiple second electrodes 12 are connected in an array on the main body.

[0047] In this embodiment, by setting multiple first electrodes 11 and second electrodes 12, and having the same number of first electrodes 11 and second electrodes 12 in a one-to-one correspondence, and arranging them in an array on the main body, it is convenient for the capacitor to be connected to the external circuit system.

[0048] Another embodiment of the present invention includes a circuit system comprising the aforementioned low-inductance capacitor.

[0049] Compared with the prior art, the beneficial effects of the circuit system in this embodiment are roughly the same as those of the low-inductance capacitor described above, and will not be repeated here.

[0050] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A low inductance capacitor characterized by, The capacitor comprises a main body, a first electrode (11) and a second electrode (12), the first electrode (11) and the second electrode (12) are of the same size, the central axis of the first electrode (11) and the central axis of the second electrode (12) are parallel to each other, and the first electrode (11) and the second electrode (12) are electrically connected with the main body.

2. The low inductance capacitor of claim 1, wherein, The capacitor further comprises a first polar plate (131) and a second polar plate (132) which are parallel to each other, the first electrode (11) is connected to the side of the first polar plate (131) away from the second polar plate (132), the second electrode (12) is connected to the side of the second polar plate (132) close to the first polar plate (131), the first polar plate (131) is provided with a connecting hole, the second electrode (12) is arranged in the connecting hole, and the first polar plate (131) and the second polar plate (132) are electrically connected with the main body.

3. The low inductance capacitor of claim 2, wherein, The main body comprises a core (2) and a first connecting sheet (3), the core (2) comprises a plurality of elements (21) arranged in an array, one side of the plurality of elements (21) is connected with the second polar plate (132), the other side of the plurality of elements (21) is connected with the first connecting sheet (3), and the first polar plate (131) is electrically connected with the side of the first connecting sheet (3) away from the elements (21).

4. The low inductance capacitor of claim 3, wherein, The main body further comprises a second connecting sheet (4), the second connecting sheet (4) is of a U-shaped structure, the inner walls of the two sides of the second connecting sheet (4) are respectively connected to the two ends of the side of the first connecting sheet (3) away from the core (2) along the width direction, and the inner walls of the other sides of the second connecting sheet (4) are respectively connected to the two ends of the first polar plate (131) along the width direction.

5. The low inductance capacitor of claim 3, wherein, The plurality of elements (21) are welded on the first connecting sheet (3).

6. The low inductance capacitor of claim 4, wherein, The main body further comprises two first insulating plates (5), one of the first insulating plates (5) is arranged between one of the second connecting sheets (4) and the core (2), and the other of the first insulating plates (5) is arranged between the other of the second connecting sheets (4) and the core (2).

7. The low inductance capacitor of claim 4, wherein, The main body further comprises a second insulating plate (6), the second insulating plate (6) is arranged between the first polar plate (131) and the second polar plate (132), the second insulating plate (6) is provided with a through hole for the second electrode (12) to pass through, the through hole is provided with an upwardly extending insulating ring on the hole wall, the second electrode (12) is arranged in the through hole and the connecting hole, and the insulating ring is located between the hole wall of the connecting hole and the circumferential surface of the second electrode (12).

8. The low inductance capacitor of claim 7, wherein, The second insulating plate (6) is made of epoxy resin.

9. The low inductance capacitor of claim 1, wherein, The first electrode (11) and the second electrode (12) are both multiple, and the plurality of first electrodes (11) and the plurality of second electrodes (12) are arranged in an array on the main body.

10. A circuit system, characterized by, The capacitor comprises the low-inductance capacitor according to any one of claims 1 to 9. The capacitor comprises the low-inductance capacitor according to any one of claims 1 to 9.

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