CN220041611U - Direct current supporting capacitor - Google Patents

Abstract

The utility model discloses a direct-current supporting capacitor, which comprises a safety capacitor, a conductive bar and a core; the safety capacitor comprises an X capacitor or a Y capacitor or both, the conducting bars are welded at two poles of the core, and the conducting bars comprise an anode busbar and a cathode busbar; one pin of the X capacitor in the safety capacitor is connected with the positive busbar, the other pin of the X capacitor is connected with the negative busbar, one pin of the Y capacitor in the safety capacitor is connected with the positive busbar or the negative busbar, and the other pin of the Y capacitor is grounded through the grounding busbar.

Description

Direct current supporting capacitor

Technical Field

The utility model relates to the technical field of electronic components, in particular to a direct-current supporting capacitor.

Background

The new energy automobile field widely utilizes a direct current support capacitor to filter and absorb peak, and is characterized by large capacity, small ESR and ESL. The large capacity is formed by winding a plurality of metallized films into cores and connecting the cores in parallel, and then leading out the cores through a busbar. The busbar and the end face of the core are welded together. Along with the large-scale application of novel power semiconductor devices such as silicon carbide, gallium nitride and the like, the switching frequency is higher and higher, the electromagnetic compatibility environment faced by a capacitor is worse, and along with the requirement of high power density, how to meet the stricter electromagnetic compatibility requirement, and the requirements of small volume, high power density and high integration level become new challenges of capacitor design.

Disclosure of Invention

Because of the problems in the prior art, the utility model provides a direct-current support capacitor which can meet stricter electromagnetic compatibility requirements and also can meet the requirements of small volume, high power density and high integration level.

The utility model can be solved by the following technical scheme:

a DC supporting capacitor comprises a safety capacitor, a conductive bar and a core; the safety capacitor comprises an X capacitor or a Y capacitor or both, the conducting bar is welded at two poles of the core, and the conducting bar comprises an anode busbar and a cathode busbar; one pin of the X capacitor in the safety capacitor is connected with the positive busbar, the other pin of the X capacitor in the safety capacitor is connected with the negative busbar, one pin of the Y capacitor in the safety capacitor is connected with the positive busbar or the negative busbar, and the other pin of the Y capacitor is grounded through the grounding busbar.

Further, a shell is arranged outside the safety capacitor, the conducting bars and the core are packaged in the shell after being welded, and pouring sealant is used for pouring sealing treatment inside the shell.

Further, the positive electrode busbar and the negative electrode busbar in the conductive row respectively comprise an input end and an output end.

Further, the input end at least comprises one, the output end at least comprises one, and the conductive row adopts a laminated busbar.

Further, the output end is three-phase output, and the conducting bar is a copper bar or an aluminum bar.

Further, the conducting bars are sleeved with magnetic cores, and the number of the magnetic cores is one or more.

Further, the safety capacitor is one or more than one.

Further, the main body of the core is formed by winding a metallized film and then spraying metal on the end face.

Due to the adoption of the technical scheme, the utility model has the following beneficial effects:

according to the utility model, the safety capacitor is added in the design of the direct-current supporting capacitor, so that the electromagnetic noise generated by the turn-on and turn-off of the rear-end power semiconductor switch has a shorter transmission path, thereby meeting the harsher electromagnetic compatibility requirement, and the safety capacitor is integrated in the direct-current supporting capacitor, so that the total volume of the direct-current supporting capacitor is smaller and the power density is higher; the parasitic inductance of the traditional busbar is reduced by using the laminated busbar, so that the installation is easy, and the electromagnetic compatibility is better; the magnetic ring is sleeved on the conducting bar, so that the electromagnetic compatibility is better, the volume is smaller, and the integration level is higher.

Drawings

FIG. 1 is a schematic diagram of a DC supporting capacitor according to the present utility model

FIG. 2 is a schematic diagram showing the structure of the pre-encapsulating device according to the present utility model

FIG. 3 is a schematic diagram of the structure of the core, busbar, magnetic core and safety capacitor of the present utility model

FIG. 4 is a schematic diagram of a core structure

The figure shows:

1: a conductive bar; 11: a positive electrode busbar; 111: an input end; 112: an output end; 12: a negative electrode busbar; 121: input terminal 122: an output end; 2: a safety capacitor; 21: an X capacitor; 22: y capacitance; 3: a core; 31: a metallized film; 32: a metal spraying layer; 4: a ground row; 5: a magnetic core; 6: a housing; 7: pouring sealant

Detailed Description

In order to make the technical solutions and advantages of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments, but not all embodiments of the present utility model. All other embodiments, which can be made by one of ordinary skill in the art without creative efforts, are within the scope of the present utility model based on the embodiments of the present utility model.

In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. For simplicity and ease of understanding, in some of the figures, only one of which is schematically depicted, or only one of which is labeled, has the same structure or function. Herein, "a" means not only "only this one" but also "more than one" case.

The technical scheme of the utility model is described in detail in the following by specific embodiments.

Referring to fig. 1-3, a dc supporting capacitor mainly includes a conductive bar 1, a safety capacitor 2, a core 3, and a housing 6 (the safety capacitor 2 may be a safety capacitor core without a housing); the safety capacitor 2 comprises an X capacitor 21 and a Y capacitor 22 (only X capacitor or only Y capacitor can be adopted); the conducting bar 1 comprises an anode busbar 11 and a cathode busbar 12, one pin of an X capacitor 21 in the safety capacitor 2 is connected with the anode busbar 11, the other pin of the X capacitor 21 is connected with the cathode busbar 12, one pin of a Y capacitor 22 in the safety capacitor 2 is connected with the anode busbar 11 or the cathode busbar 12, and the other pin of the Y capacitor 22 is grounded through a grounding bar 4 or grounded through other modes; the body of the core 3 is composed of a rolled metallized film 31 and an end-face metal layer 32, as shown in fig. 4.

The positive electrode busbar 11 and the negative electrode busbar 12 in the conductive busbar 1 include input ends 111 and 121 and output ends 112 and 122.

Wherein, the input end contains at least one, the output end contains at least one, and the busbar can adopt the stromatolite busbar.

The output ends 112 and 122 are three-phase outputs, and the conductive bar 1 may be a copper bar, an aluminum bar or other conductive materials.

Wherein, the conducting bar 1 can be sleeved with a magnetic core 5, and the number of the magnetic cores can be one or more.

In this embodiment, a small capacitance X capacitor 21 is welded to the near three-phase output ends 112 and 122, and a Y capacitor 22 is welded between the conductive bar 1 and the ground bar 4.

Wherein, the conductor bar 1 is welded at two poles of the core 3, and the conductor bar 1 and the core 3 are packaged in a shell 6 after being welded.

Wherein, the inside of the shell 6 is encapsulated by a pouring sealant 7.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will appreciate that; the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the technical scope of the embodiments of the present utility model.

Claims (8)

1. A DC supporting capacitor comprises a safety capacitor, a conductive bar and a core; the method is characterized in that: the safety capacitor comprises an X capacitor or a Y capacitor or both, the conducting bar is welded at two poles of the core, and the conducting bar comprises an anode busbar and a cathode busbar; one pin of the X capacitor in the safety capacitor is connected with the positive busbar, the other pin of the X capacitor in the safety capacitor is connected with the negative busbar, one pin of the Y capacitor in the safety capacitor is connected with the positive busbar or the negative busbar, and the other pin of the Y capacitor is grounded through the grounding busbar.

2. The direct current support capacitor of claim 1, wherein a housing is arranged outside the safety capacitor, the conductive bars and the core are packaged in the housing after being welded, and potting adhesive is used for potting inside the housing.

3. A dc support capacitor as claimed in claim 1, wherein the positive and negative electrode bus bars of the conductive bars include an input terminal and an output terminal, respectively.

4. A dc support capacitor as claimed in claim 3, wherein said input terminal comprises at least one and said output terminal comprises at least one, said conductor bars being laminated bus bars.

5. A dc support capacitor as claimed in claim 3, wherein the output is a three-phase output and the conductive bars are copper bars or aluminum bars.

6. A dc support capacitor as claimed in claim 3, wherein the conductor bars are sleeved with one or more magnetic cores.

7. The direct current support capacitor of claim 1, wherein the safety capacitor is one or more than one.

8. A dc support capacitor as claimed in claim 1, wherein the body of the core is formed by winding a metallized film and then end-face blasting.