CN112908710A

CN112908710A - Aluminum electrolytic capacitor module integrated with Y capacitor

Info

Publication number: CN112908710A
Application number: CN202110195103.8A
Authority: CN
Inventors: 周旺龙
Original assignee: Individual
Current assignee: Individual
Priority date: 2021-02-19
Filing date: 2021-02-19
Publication date: 2021-06-04

Abstract

An aluminum electrolytic capacitor module integrated with a Y capacitor comprises an aluminum electrolytic capacitor, positive and negative conductive copper bars, the Y capacitor and a ground wire, wherein the aluminum electrolytic capacitor is electrically connected with the positive and negative conductive copper bars correspondingly; and meanwhile, the Y capacitor effectively inhibits the common-mode interference of the power electronic device, and the EMC reliability of the whole power electronic device system is improved.

Description

Aluminum electrolytic capacitor module integrated with Y capacitor

The technical field is as follows:

the invention relates to an aluminum electrolytic capacitor integrated module, in particular to a Y capacitor and aluminum electrolytic capacitor integrated module which is used for inhibiting EMI electromagnetic interference of a power electronic device, improving EMC reliability, preventing aluminum foil polarization of a negative electrode of an aluminum electrolytic capacitor and prolonging the service life of the aluminum electrolytic capacitor.

Background art:

the power electronic device comprises a switching power supply, an inverter or a frequency converter and other power supply equipment, the output voltage and frequency are adjusted by the switch of the IGBT/MOSFET semiconductor device, and the actually required power supply voltage can be provided according to the load so as to achieve the aim of energy saving.

The power electronic device adopts a pulse modulation technology (PWM), and can superpose higher harmonics at an output end, the higher harmonics can generate differential mode interference at the output end, and the higher harmonics are mainly transmitted on a positive electrode and a negative electrode of a direct current bus at an input side and an alternating current cable from the aspect of a differential mode current transmission path; at the moment when the IGBT/MOSFET tube is switched on or off, high Du/Dt can be generated, parasitic capacitance to the ground is continuously charged and discharged through a switching device, a metal lead, a radiating fin, a shell and the like in a loop, common mode current is generated, and radiation interference can be generated by the differential mode current and the common mode current.

A power wire in the power electronic device generates strong radiation to form a high-efficiency radiation antenna; when the power electronic complete machine system works, a loop formed by differential mode current can form a loop antenna, and electromagnetic interference is radiated outwards; the power electronic device generally adopts a metal shell for electromagnetic shielding, and when a gap exists in the shielding shell, a gap antenna is formed to radiate electromagnetic interference outwards; a large amount of radiated noise interference signals not only affect the radio equipment around the power electronic device, but also affect the operational reliability of the electronic control unit of the power electronic device by conduction or radiation, especially the electronic control unit with high electromagnetic sensitivity in the high-voltage high-power electronic device system, and the problem of electromagnetic compatibility EMC caused by this is particularly prominent and needs to be paid more attention.

In order to balance voltage fluctuation caused by IGBT switches in the power electronic integrated device, a power bus capacitor is required to be adopted for filtering so as to stabilize voltage.

Generally, aluminum electrolytic capacitors are discrete structures and include products with lead wires, soldering lugs, bolts and other leading-out modes, users need to combine the products in series and parallel, and integrate various performance parameters to adapt to indexes of the products such as voltage, power, ripple current, correction frequency, temperature coefficient and the like, so that a power bus filter capacitor of the capacitor combination for power electronic devices is formed.

The aluminum electrolytic capacitor module integrating the discrete aluminum electrolytic capacitors into a whole can enhance the heat dissipation capability and optimize the electrical performance, and the small aluminum electrolytic capacitor integrated module products disclosed in patent 202011082745.9 or 202011082897.9 greatly improve the ripple current capability, the high-frequency characteristic, the long service life and other electrical properties.

Due to the fact that multiple electromagnetic radiation noises exist in a power electronic system device, particularly higher harmonics exist on a power direct-current bus, and an aluminum electrolytic capacitor cannot effectively absorb or filter out the higher harmonics smoothly, reverse pulse current formation can be conducted on a negative electrode foil by electrolyte inside the aluminum electrolytic capacitor, and then a large amount of gas and heat are generated to enable the aluminum electrolytic capacitor to age and fail quickly.

Safety capacitors are generally used for preventing electric shock and protecting personal safety, X capacitors are used for suppressing circuit differential mode interference, and Y capacitors are used for suppressing circuit common mode interference.

The invention content is as follows:

the invention provides an aluminum electrolytic capacitor module integrated with a Y capacitor, which aims to prevent aluminum foil polarization of a cathode of an aluminum electrolytic capacitor, prolong the service life and improve the reliability of the aluminum electrolytic capacitor, and simultaneously help to improve EMI electromagnetic interference of a power electronic complete machine system and improve EMC reliability.

The utility model provides an integrated Y electric capacity's aluminum electrolytic capacitor module, includes aluminum electrolytic capacitor, positive negative pole conductive copper bar, Y electric capacity and earth connection, wherein aluminum electrolytic capacitor positive negative pole and positive negative pole conductive copper bar correspond the electricity and connect, and the Y electric capacity has two kinds of electricity of positive pole conductive copper bar ground wire and negative pole conductive copper bar ground wire to be connected, and Y electric capacity and aluminum electrolytic capacitor constitute the circuit parallel structure on positive negative pole conductive copper bar.

The Y capacitor is integrated through the aluminum electrolytic capacitor module, so that the problem that the electrolyte in the aluminum electrolytic capacitor carries out reverse pulse current formation on the negative electrode foil due to higher harmonics existing on a power direct current bus is effectively solved, and the aluminum electrolytic capacitor is prevented from aging and losing efficacy in advance; and meanwhile, the Y capacitor effectively inhibits the common-mode interference of the power electronic device, and the EMC reliability of the whole power electronic device system is improved.

Description of the drawings:

the above and other features of the present invention will be presented in the following description with reference to the accompanying drawings;

FIG. 1: the structure diagram of the circuit of the aluminum electrolytic capacitor module integrated with the Y capacitor;

FIG. 2: the positive and negative electrode conductive copper bars, the Y capacitor and the aluminum electrolytic capacitor are assembled together;

FIG. 3: the Y capacitor and the grounding wire are assembled schematically;

FIG. 4: and the appearance schematic diagram of the integrated Y capacitor of the aluminum electrolytic capacitor module.

The figures in the drawings represent the following:

1-positive electrode conductive copper bar

11-positive electrode conductive copper bar negative electrode terminal through hole

2-negative electrode conductive copper bar

3-Y capacitor

31-positive electrode conductive copper bar ground wire bridging capacitor

32-negative electrode conductive copper bar ground wire cross-over capacitor

4-aluminium electrolytic capacitor

5-earth wire

51-ground terminal

The specific implementation mode is as follows:

the present invention will be described in further detail with reference to the following detailed description and accompanying drawings. In the following embodiments, numerous details are set forth in order to provide a better understanding of the present invention. However, those skilled in the art will readily recognize that certain features may be replaced or omitted by other elements, materials, methods, or the like in various instances. In some cases, related operations are not shown or described in the specification, so as to avoid obscuring the core of the present application from excessive description, and to enable those skilled in the art to fully understand the related operations from the description in the specification and the general knowledge in the art.

The following are preferred embodiments:

as shown in fig. 1, which is a circuit structure diagram of an aluminum electrolytic capacitor module integrated with Y capacitors, a plurality of aluminum electrolytic capacitors 4 are connected in parallel with two

series Y capacitors

31 and 32, and bridged between positive and negative

conductive copper bars

1 and 2, and a ground wire 5 is led out between the two

series Y capacitors

31 and 32.

As shown in fig. 2, the assembly diagram of the positive and negative electrode conductive copper bars, the Y capacitor and the aluminum electrolytic capacitor is shown, the positive and negative electrode laminated

conductive copper bars

1 and 2 at the front part of the aluminum electrolytic capacitor module are connected in parallel with the aluminum electrolytic capacitor 4, integrated inside the capacitor module and correspondingly electrically connected, meanwhile, the Y capacitor 31 is electrically connected with the positive electrode conductive copper bar 1, and the lead of the Y capacitor 32 passes through the positive electrode conductive copper bar through hole 11 and is electrically connected with the negative electrode conductive copper bar 2.

As shown in fig. 3, which is an assembly diagram of the Y capacitor and the ground line, the lead wires on the other sides of the

Y capacitors

31 and 32 are electrically connected to the ground copper bar 5, so that the Y capacitor 31 is formed to bridge the positive conductive copper bar 1 and the ground line 5, the Y capacitor 31 is connected to the negative conductive copper bar 2 and the ground line 5, and the ground copper bar 5 has a through terminal 51.

As shown in fig. 4, which is an appearance schematic diagram of an integrated Y capacitor of an aluminum electrolytic capacitor module, a bus terminal structure is arranged at the front end of the aluminum electrolytic capacitor module, positive and negative

conductive copper bars

1 and 2 are electrically connected with positive and negative power buses of the whole machine, and a grounding wire adapter terminal 51 is arranged at the rear end of the aluminum electrolytic capacitor module and is led out from the interior of the aluminum electrolytic capacitor module for electrically connecting with a grounding wire of the whole machine.

The invention has been described above using specific examples, which are only intended to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. The utility model provides an integrated Y electric capacity's aluminum electrolytic capacitor module, includes aluminum electrolytic capacitor, positive negative pole conductive copper bar, Y electric capacity and earth connection, wherein aluminum electrolytic capacitor positive negative pole and positive negative pole conductive copper bar correspond the electricity and connect, and the Y electric capacity has two kinds of electricity of positive pole conductive copper bar earth connection and negative pole conductive copper bar earth connection to be connected, and Y electric capacity and aluminum electrolytic capacitor constitute the parallel circuit structure on positive negative pole conductive copper bar.

2. The aluminum electrolytic capacitor module of claim 1, wherein the aluminum electrolytic capacitor module comprises: including any structural manner of aluminum electrolytic capacitor module.

3. The aluminum electrolytic capacitor module of claim 1, wherein the aluminum electrolytic capacitor module comprises: the aluminum electrolytic capacitor bank can be connected to the positive and negative conductive copper bars in parallel, or can be connected in series or in series-parallel.

4. The Y-capacitor integrated aluminum electrolytic capacitor module as claimed in claim 1, wherein the Y-capacitor is characterized in that: any kind of capacitor such as a ceramic capacitor or a film capacitor may be used.

5. The aluminum electrolytic capacitor module integrated with Y capacitor as claimed in claims 1 and 4, wherein the Y capacitor is characterized in that: one Y capacitor can be used in a bridging mode, and a plurality of Y capacitors can be used in a bridging mode in parallel.

6. The Y-capacitor integrated aluminum electrolytic capacitor module as claimed in claim 1, wherein the Y-capacitor electrical connection is characterized by: the Y capacitor can be connected with the positive conductive copper bar and the negative conductive copper bar in series and simultaneously electrically connected with the ground wire in two ways, and the Y capacitor can be independently electrically connected with the positive conductive copper bar or the negative conductive copper bar and the ground wire in one way.

7. The aluminum electrolytic capacitor module integrated with Y capacitor as claimed in claim 1, 5, wherein the position of Y capacitor is characterized by: the Y capacitor or the Y capacitor bank can be internally arranged in the aluminum electrolytic capacitor module or externally hung outside the aluminum electrolytic capacitor module.

8. The aluminum electrolytic capacitor module integrated with Y capacitor as claimed in claim 1, 5, 7, wherein the electrical connection of the Y capacitor or the Y capacitor bank is characterized in that: the welding mode or the screw tightening mode can be adopted to electrically connect the synchronous aluminum electrolytic capacitor module with the power semiconductor module.

9. The Y-capacitor integrated aluminum electrolytic capacitor module as claimed in claim 1, wherein the ground line is characterized by: the metal conducting wire can be a metal conducting bar in any shape.

10. The aluminum electrolytic capacitor module with integrated Y capacitor as claimed in claims 1 and 8, wherein the grounding line is characterized by: the direct leading-out can be connected with the ground wire of the whole machine, and the switching terminal can also be arranged and then connected with the ground wire of the whole machine.