CN209963431U - Direct-current busbar for electric vehicle inverter - Google Patents
Direct-current busbar for electric vehicle inverter Download PDFInfo
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- CN209963431U CN209963431U CN201920830174.9U CN201920830174U CN209963431U CN 209963431 U CN209963431 U CN 209963431U CN 201920830174 U CN201920830174 U CN 201920830174U CN 209963431 U CN209963431 U CN 209963431U
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Abstract
A direct current bus bar for an electric vehicle inverter is formed by compounding multiple layers and comprises an insulating layer, and a positive electrode conducting layer and a negative electrode conducting layer which are compounded on two sides of the insulating layer respectively, wherein the direct current bus bar is provided with three pairs of power module positive and negative electrode connecting holes which are respectively and electrically connected with the positive electrode conducting layer and the negative electrode conducting layer, and at least one pair of capacitor positive and negative electrode connecting holes which are respectively and electrically connected with the positive electrode conducting layer and the negative electrode conducting layer, each pair of power module positive and negative electrode connecting holes are used for being correspondingly connected with the positive electrode and the negative electrode of a SiC MOSFET power module, each pair of capacitor positive and negative electrode connecting holes are used for being correspondingly connected with the positive electrode and the negative electrode of a direct current bus capacitor, the direct current bus bar is applied to the vehicle SiC inverter, the distribution of the surface current of the direct current bus bar is more uniform, the condition of overh, the technical requirements of high voltage and large current of the automobile SiC inverter are met.
Description
Technical Field
The utility model relates to a power electronic technology field especially relates to a female row of direct current for electric automobile dc-to-ac converter.
Background
With the rapid development of global economy and technology, energy consumption has increased year by year. Currently, global carbon dioxide (CO)2) 25% of the emissions originate from automobiles. It is reported that, by 2030, global CO2The discharge amount will reach 423 hundred million tons. In China, pollution caused by automobile emission becomes a main factor in urban air pollution, and CO in China2Emission is on the 2 nd global at present, and energy conservation and emission reduction become important topics for the development of the automobile industry. Therefore, the development of new energy automobiles is a necessary strategic measure for realizing energy conservation and emission reduction and the leap-type and sustainable development of the automobile industry in China.
At present, the new energy automobile industry has become an important part of development strategy in China. The transmission modes of current and voltage among the inverter power modules of the electric automobile are various, and the traditional conductors mainly comprise cables, flexible connecting lines and copper bars. With the continuous improvement of traction power of electric locomotives, high voltage and large current conversion technology has become a new research direction.
Traditional bare copper bar, because need leave the electric clearance of certain voltage class between the bare copper bar during current transmission, occupation space is great, has various conductors in the converter moreover, leads to having stray inductance in the circuit. Under high switching frequency, the stray inductance increases the voltage stress of the switching device, and reduces the working stability of the device.
In the electric automobile inverter, the parasitic inductance in the SiC MOSFET power module of the current conversion loop and the equivalent parasitic inductance of the branch support capacitor are fixed and cannot be changed when the elements leave a factory, and the only link capable of reducing the parasitic inductance through design is the direct-current bus link. The function of the direct current bus is to realize the electrical connection between the direct current bus capacitor and the power device. If the cable stranded wire is adopted, although the cable stranded wire has the characteristics of low price and convenient use, the self inductance and the mutual inductance of the cable are both large, and the cable stranded wire is suitable for occasions with medium and small power; the direct connection of the copper bars or the copper plates has the characteristics of easy design, simple manufacture, capability of bearing larger power and the defect of large self-inductance mutual inductance, and is suitable for occasions with high power and low performance requirements.
Therefore, a dc bus with a wide application range and low parasitic inductance is needed.
Disclosure of Invention
The utility model discloses a solve the above-mentioned problem that prior art exists, provide a female row of direct current for electric automobile dc-to-ac converter.
The utility model provides a direct current bus bar for an electric vehicle inverter, which is formed by compounding a plurality of layers, and comprises an insulating layer, and a positive conductive layer and a negative conductive layer which are compounded on two sides of the insulating layer respectively;
the direct current bus bar is provided with three pairs of power module positive and negative connecting holes which are respectively and electrically connected with the positive and negative conducting layers, and at least one pair of capacitor positive and negative connecting holes which are respectively and electrically connected with the positive and negative conducting layers, wherein each pair of power module positive and negative connecting holes are used for being correspondingly connected with the positive and negative electrodes of a SiC MOSFET power module, and each pair of capacitor positive and negative connecting holes are used for being correspondingly connected with one pair of positive and negative electrodes of a direct current bus capacitor;
the arrangement directions of the positive and negative connecting holes of the power module and the capacitor are parallel to the current direction on the direct-current bus;
the direct current busbar is positioned at a side edge which is provided with a positive electrode connecting part and a negative electrode connecting part which are respectively electrically connected with the positive electrode conducting layer and the negative electrode conducting layer, the side edge which is provided with the positive electrode connecting part and the negative electrode connecting part of the power supply is vertical to the current direction on the direct current busbar, and the positive electrode connecting part and the negative electrode connecting part of the power supply are used for being connected with the positive electrode and the negative electrode of the
As the utility model discloses a further preferred technical scheme is every right power module is just, the negative pole connecting hole is one, and three is right power module is just, the negative pole connecting hole is two lines of three rows of distributions on female arranging of direct current.
As the utility model discloses a further preferred technical scheme is two lines three rows power module is just, the negative pole connecting hole is evenly laid on the female regional one side of arranging of direct current, electric capacity is just, the negative pole connecting hole is evenly laid on the female opposite side region of arranging of direct current.
As a further preferred technical scheme of the utility model, power module just, the negative pole connecting hole and electric capacity just, the negative pole connecting hole is the female through-hole that arranges of running through direct current from top to bottom.
As a further preferred technical solution of the present invention, the power module positive connecting hole and the capacitor positive connecting hole include a positive connecting hole site located on the positive conducting layer, and a positive avoiding hole site located on the negative conducting layer and the insulating layer and corresponding to the positive connecting hole site up and down, and the positive avoiding hole site has a larger aperture than the positive connecting hole site; the power module negative pole connecting hole with electric capacity negative pole connecting hole is including being located the negative pole on the negative pole conducting layer and connecting the hole site to and be located on positive conducting layer and the insulating layer with the hole site is dodged to the negative pole that the negative pole corresponds from top to bottom, just the hole site is dodged to the negative pole aperture is greater than the hole site is connected to the negative pole aperture.
As a further preferred technical scheme of the utility model, the power just, negative pole connecting portion are outwards extended and are buckled by just, negative pole conducting layer respectively and constitute the L type and form, have just, the power connecting hole that the negative pole is connected that is used for corresponding with DC power supply on the power just, the negative pole connecting portion.
As a further preferred technical scheme of the utility model, just, the negative pole conducting layer is the copper, female whole appearance of arranging of direct current is dull and stereotyped platelike.
The utility model discloses a female row of direct current for electric automobile dc-to-ac converter through adopting above-mentioned technical scheme, has following beneficial effect:
1) the distribution of the surface current of the direct-current busbar is more uniform, the condition of overhigh local current density is avoided, and a large-area dead copper area is not existed;
2) the parasitic inductance of the direct-current busbar is small;
3) the structure is simple, and the processing is convenient.
Drawings
FIG. 1 is a schematic diagram of a spatial position of a DC bus bar used in an inverter of an electric vehicle in the inverter according to an embodiment.
Fig. 2 is a schematic perspective view of a dc bus for an electric vehicle inverter.
Fig. 3 is a schematic structural diagram of an embodiment provided by a dc bus for an electric vehicle inverter.
Fig. 4 is a schematic structural diagram of another embodiment provided by a dc bus bar for an electric vehicle inverter.
Fig. 5(a) is a schematic diagram of the effect of mutual overlapping of currents on the positive and negative conductive layers of the dc bus when the direction of the current is perpendicular to the arrangement direction of the capacitor electrodes.
Fig. 5(b) is a schematic diagram of the effect of mutual overlapping of currents on the positive and negative conductive layers of the dc bus when the directions of currents are parallel to each other in the arrangement direction of the capacitor electrodes.
Fig. 6 (a) is a surface current distribution cloud chart of the positive conductive layer of the dc bus bar.
Fig. 6 (b) is a cloud diagram of the surface current distribution of the dc bus negative conductive layer.
In the figure: 1. insulating layer, 2, positive conducting layer, 21, power module positive connecting hole, 22, capacitor positive connecting hole, 23, power supply positive connecting part, 3, negative conducting layer, 31, power module negative connecting hole, 32, capacitor negative connecting hole, 33, power supply negative connecting part, 100, direct current busbar, 200, SiC MOSFET power module, 300 and direct current bus capacitor.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
As shown in fig. 1 to 3, a dc bus bar for an electric vehicle inverter is a composite laminated bus bar formed by compounding multiple layers, and the overall shape of the dc bus bar is a flat plate, and includes an insulating layer 1, and a positive electrode conductive layer 2 and a negative electrode conductive layer 3 respectively compounded on two sides of the insulating layer 1, wherein the positive electrode conductive layer 2 and the negative electrode conductive layer 3 are both copper plates.
Three pairs of power module positive and negative connecting holes 21 and 31 respectively electrically connected with the positive and negative conducting layers 2 and 3, and at least one pair of capacitor positive and negative connecting holes 22 and 32 respectively electrically connected with the positive and negative conducting layers 2 and 3 are formed in the direct-current busbar 100, each pair of power module positive and negative connecting holes 21 and 31 is used for being correspondingly connected with the positive and negative electrodes of one SiC MOSFET power module 200, and each pair of capacitor positive and negative connecting holes 22 and 32 is used for being correspondingly connected with one positive and negative electrodes of the direct-current bus capacitor 300.
The arrangement directions of the positive and negative connection holes 21 and 31 of the power module and the arrangement directions of the positive and negative connection holes 22 and 32 of the capacitor are all parallel to the current direction on the dc bus bar 100.
The DC bus bar 100 is provided with a positive and a negative electrode connecting parts 23, 33 at one side which are respectively electrically connected with the positive and the negative electrode conducting layers 2, 3, the side provided with the positive and the negative electrode connecting parts 23, 33 is vertical to the current direction on the DC bus bar 100, and the positive and the negative electrode connecting parts 23, 33 of the power are used for being connected with the positive and the negative electrodes of the DC power.
Specifically, referring to fig. 4, the dc busbar 100 of the present invention is used as an electrical connection between the SiC MOSFET power module 200, the dc bus capacitor 300 and the dc power supply in the SiC inverter of the vehicle, and the positive and negative terminals (the "+" and "-" signs on the SiC MOSFET power module 200 in fig. 4) of the three SiC MOSFET power modules 200 and the positive and negative terminals (the "+" and "-" signs on the dc bus capacitor 300 in fig. 4) of the dc bus capacitor 300 are connected correspondingly. The dotted line frame is a space position where the reserved direct current busbar 100 is located, a proper size parameter of the direct current busbar 100 is designed according to the space position, the direct current busbar 100 is installed at the dotted line frame position, and the three SiC MOSFET power modules 200, the direct current bus capacitor 300 and each terminal on the direct current capacitor are electrically connected, so that parasitic inductance on the direct current busbar 100 is as low as possible.
In specific implementation, each pair of power module positive and negative connection holes 21, 31 is a row, three pairs of power module positive and negative connection holes 21, 31 are distributed on the dc bus bar 100 in two rows and three columns, the power module positive and negative connection holes 21, 31 in two rows and three columns are uniformly distributed on one side area of the dc bus bar 100, and the capacitor positive and negative connection holes 22, 32 are uniformly distributed on the other side area of the dc bus bar 100.
When a dc bus capacitor 300 with only one pair of positive and negative electrodes is used, a pair of capacitor positive and negative connecting holes 22 and 32 are correspondingly formed on the dc bus 100, and the arrangement is shown in fig. 3; when the dc bus capacitor 300 having three pairs of positive and negative electrodes is used, three pairs of capacitor positive and negative connection holes 22 and 32 are correspondingly disposed on the dc bus 100, and are distributed in four rows and three columns with the positive and negative connection holes of all rate modules, and the arrangement is shown in fig. 4.
In specific implementation, the positive and negative connecting holes 21 and 31 of the power module and the positive and negative connecting holes 22 and 32 of the capacitor are through holes which vertically penetrate through the direct current busbar 100, the positive connecting hole 21 of the power module and the positive connecting hole 22 of the capacitor comprise a positive connecting hole site which is positioned on the positive conducting layer 2, and positive avoiding hole sites which are positioned on the negative conducting layer 3 and the insulating layer 1 and vertically correspond to the positive connecting hole site, and the aperture of the positive avoiding hole site is larger than that of the positive connecting hole site; the power module cathode connecting hole 31 and the capacitor cathode connecting hole 32 comprise a cathode connecting hole site on the cathode conducting layer 3 and a cathode avoiding hole site corresponding to the cathode connecting hole up and down on the anode conducting layer 2 and the insulating layer 1, and the aperture of the cathode avoiding hole site is larger than that of the cathode connecting hole site.
In a specific embodiment, the power source positive and negative electrode connecting portions 23 and 33 are formed by extending and bending the positive and negative electrode conductive layers 2 and 3 outward to form an L shape, and the power source positive and negative electrode connecting portions 23 and 33 have power source connecting holes for connecting the positive and negative electrodes corresponding to the dc power source.
The utility model discloses a structural principle:
high-frequency current flows through two conductors which are close to each other, and if the distance h between the two conductors and the width w of the conductors meet h < < w, namely the two conductors have larger areas and are closely attached through the insulating layer 1, the high-frequency current is mainly distributed on two planes which are close to each other and are formed by combining the skin effect; in addition, when the directions of high-frequency currents flowing through the two conductors are opposite, the directions of magnetic induction lines generated by the two currents are opposite, magnetic fields radiated outside are mutually counteracted, equivalently, the loop parasitic inductance formed by the two conductors is suppressed to a certain degree, the suppression degree depends on the distribution area and strength of the currents opposite in the pair of directions in the two conductors, and the principle is that the parasitic inductance of the laminated busbar is low.
According to the principle, in the application of SiC MOSFET electric automobile inverter, the device switching speed is fast, the current change in the commutation return circuit is very fast, the current in the return circuit is a high frequency current in the twinkling of an eye this moment, to SiC MOSFET electric automobile inverter, what adopt is the two level topologies of three-phase, by two upper and lower SiC MOSFET encapsulated in a power module in the bridge arm, the conductor that flows through high frequency current in the commutation return circuit so only positive and negative direct current generating line, and the current that flows through positive and negative generating line is the same size all the time opposite direction, use under this condition the utility model discloses a female 100 (female arranging of compound stromatolite) of arranging of direct current will gain less parasitic inductance.
The following description will take the examples to describe the influence of the arrangement direction of the positive and negative electrode positions of the capacitor on the parasitic inductance, and the arrangement direction of the positive and negative electrode positions of the capacitor generally has two forms: one is perpendicular to the direction of the current path on the dc bus bar 100, as shown in fig. 5 (a); the other is parallel to the current path direction on the dc bus bar 100, as shown in fig. 5 (b). Fig. 5 shows a schematic diagram of the overlapping effect of the currents on the positive and negative conductive layers 2, 3 of the dc busbar 100 in these two cases, fig. 5(b) shows the implementation method of the present invention, and in fig. 5,
is a connection point of a positive electrode of the capacitor and a positive plate of the busbar,
the current path of the positive plate of the busbar is the connection point of the negative electrode of the capacitor and the negative plate of the busbar, and the current path of the negative plate of the busbar is the connection point of the negative plate of the capacitor and the busbar.
It can be seen that under the guidance of the positive and negative conductive layers 2 and 3 of the capacitor in the situation shown in fig. 5(a), the current distribution ranges on the positive and negative conductive layers 2 and 3 of the dc bus 100 are staggered by a certain distance in the capacitor electrode arrangement direction, so that a part of the currents on the positive and negative plates are not overlapped, the magnetic fields cannot be offset with each other, a lamination blind area is caused, and the parasitic inductance is large;
in the case shown in fig. 5(b), the distribution of the current on the two plates is similar under the guidance of the positive and negative conductive layers 2 and 3 of the capacitor, and the overlapping area of the current is large, so that the effect of mutual cancellation of the magnetic fields is good, and correspondingly, the parasitic inductance of the dc busbar 100 is small.
Therefore, the utility model discloses well female row 100 of direct current adopts the positive and negative electrode array orientation of electric capacity and female row on the hole site that current direction parallel mode set up electric capacity just, negative pole connecting hole 22, 32 to reduce the female parasitic inductance of arranging 100 of direct current.
In the experimental process, a current distribution cloud picture on the surface of the direct-current busbar 100 can be obtained through simulation, and referring to fig. 6, wherein 6 (a) is a current distribution cloud picture on the top surface of the positive conducting layer 2, 6 (b) is a current distribution cloud picture on the bottom surface of the negative conducting layer 3, the dark part in the two pictures shows that the current density is high, and the light part shows that the current density is low, so that the current distribution on the surface of the direct-current busbar 100 is uniform, the gradient is low, the current distribution on the surface of the direct-current busbar 100 is more uniform, the situation of overhigh local current density is avoided, and a large-area dead copper.
The utility model discloses a female 100 that arranges of direct current is as the electrical connection between SiC MOSFET power module 200, direct current bus-bar capacitor 300 and the DC power supply in car SiC inverter, not only makes the female distribution of 100 surface current of arranging of direct current more even, does not have the too high condition of local current density, does not also have the regional existence of the dead copper of large tracts of land, and the female 100 parasitic inductance of arranging of direct current is little in addition, satisfies car SiC inverter high voltage, the technical requirement of heavy current.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A direct current bus bar for an electric vehicle inverter is formed by compounding multiple layers and is characterized by comprising an insulating layer, and a positive electrode conducting layer and a negative electrode conducting layer which are compounded on two sides of the insulating layer respectively;
the direct current bus bar is provided with three pairs of power module positive and negative connecting holes which are respectively and electrically connected with the positive and negative conducting layers, and at least one pair of capacitor positive and negative connecting holes which are respectively and electrically connected with the positive and negative conducting layers, wherein each pair of power module positive and negative connecting holes are used for being correspondingly connected with the positive and negative electrodes of a SiC MOSFET power module, and each pair of capacitor positive and negative connecting holes are used for being correspondingly connected with one pair of positive and negative electrodes of a direct current bus capacitor;
the arrangement directions of the positive and negative connecting holes of the power module and the capacitor are parallel to the current direction on the direct-current bus;
the direct current busbar is positioned at one side edge and is provided with a positive electrode connecting part and a negative electrode connecting part which are respectively electrically connected with the positive electrode conducting layer and the negative electrode conducting layer, the side edge provided with the positive electrode connecting part and the negative electrode connecting part of the power supply is vertical to the current direction on the direct current busbar, and the positive electrode connecting part and the negative electrode connecting part of the power supply are used for being connected with the positive electrode and the negative electrode of the direct current power.
2. The direct-current busbar for the inverter of the electric vehicle as claimed in claim 1, wherein each pair of the positive and negative connecting holes of the power module is a column, and three pairs of the positive and negative connecting holes of the power module are distributed on the direct-current busbar in two rows and three columns.
3. The direct-current bus bar for the electric vehicle inverter according to claim 2, wherein the power module positive and negative connecting holes in two rows and three columns are uniformly distributed on one side region of the direct-current bus bar, and the capacitor positive and negative connecting holes are uniformly distributed on the other side region of the direct-current bus bar.
4. The direct-current busbar for the electric vehicle inverter according to claim 1, wherein the power module positive and negative electrode connecting holes and the capacitor positive and negative electrode connecting holes are through holes which penetrate through the direct-current busbar from top to bottom.
5. The direct-current bus bar for the electric vehicle inverter according to claim 4, wherein the power module positive connecting hole and the capacitor positive connecting hole comprise a positive connecting hole site on a positive conducting layer and a positive avoiding hole site corresponding to the positive connecting hole site up and down on a negative conducting layer and an insulating layer, and the aperture of the positive avoiding hole site is larger than that of the positive connecting hole site; the power module negative pole connecting hole with electric capacity negative pole connecting hole is including being located the negative pole on the negative pole conducting layer and connecting the hole site to and be located on positive conducting layer and the insulating layer with the hole site is dodged to the negative pole that the negative pole corresponds from top to bottom, just the hole site is dodged to the negative pole aperture is greater than the hole site is connected to the negative pole aperture.
6. The direct-current bus bar for the electric vehicle inverter according to claim 5, wherein the power source positive and negative electrode connecting portions are respectively formed by extending and bending a positive and negative electrode conductive layer outwards to form an L shape, and the power source positive and negative electrode connecting portions are provided with power source connecting holes for connecting positive and negative electrodes corresponding to the direct-current power source.
7. The direct-current busbar for the inverter of the electric vehicle according to any one of claims 1 to 6, wherein the positive and negative conductive layers are copper plates, and the direct-current busbar is flat-plate-shaped in overall appearance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920830174.9U CN209963431U (en) | 2019-06-04 | 2019-06-04 | Direct-current busbar for electric vehicle inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920830174.9U CN209963431U (en) | 2019-06-04 | 2019-06-04 | Direct-current busbar for electric vehicle inverter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112713787A (en) * | 2020-12-22 | 2021-04-27 | 中车永济电机有限公司 | Composite busbar for integrated capacitor of charger |
| CN114076860A (en) * | 2020-08-19 | 2022-02-22 | 华中科技大学 | Voltage detection device for half-bridge type power module |
-
2019
- 2019-06-04 CN CN201920830174.9U patent/CN209963431U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114076860A (en) * | 2020-08-19 | 2022-02-22 | 华中科技大学 | Voltage detection device for half-bridge type power module |
| CN114076860B (en) * | 2020-08-19 | 2023-02-28 | 华中科技大学 | Voltage detection device for half-bridge type power module |
| CN112713787A (en) * | 2020-12-22 | 2021-04-27 | 中车永济电机有限公司 | Composite busbar for integrated capacitor of charger |
| CN112713787B (en) * | 2020-12-22 | 2022-07-19 | 中车永济电机有限公司 | Composite busbar for integrated capacitor of charger |
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