CN110971137A - Inversion module - Google Patents
Inversion module Download PDFInfo
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- CN110971137A CN110971137A CN201911324271.1A CN201911324271A CN110971137A CN 110971137 A CN110971137 A CN 110971137A CN 201911324271 A CN201911324271 A CN 201911324271A CN 110971137 A CN110971137 A CN 110971137A
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- busbar
- inverter module
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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Abstract
The present invention relates to the field of power electronics technologies, and in particular, to an inverter module, which is a multi-tube parallel inverter module, that is, an upper bridge arm switching tube and a lower bridge arm switching tube of each phase bridge arm included in the inverter module are formed by connecting N switching tubes in parallel, and are N upper switching tubes and N lower switching tubes, respectively. This application arranges N upper switch tube and N lower switch tube one-to-one symmetry in every looks bridge arm on the female arranging of stromatolite, make at any moment, the path length that the electric current flowed through N upper switch tube tends to unanimous and the path length that flows through N lower switch tube tends to unanimous, thereby make the parasitic inductance parameter of each upper switch tube tend to unanimous and make the parasitic inductance parameter of each lower switch tube tend to unanimous, even make each upper switch tube in the contravariant module at the current unanimity of every moment and each lower switch tube at the current unanimity of every moment, and then make the effect of flow equalizing of inverter module obtain improving.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to an inversion module.
Background
At present, when the design of contravariant module, mostly adopt the female switch tube that will separate of stromatolite to arrange to connect as required, make the inner structure of self compacter to make self cost reduction. However, the most important design of the inverter module is to fully utilize the capacity of the switch tube.
The current equalizing effect among the switch tubes is a key factor for limiting the inversion module to fully utilize the capacity of the switch tubes, so that the laminated direct-current busbar is emphasized to be designed in the prior art, the dynamic stray parameters of the inversion module are reduced, and the voltage spike of the inversion module is reduced.
However, the current sharing effect of the inverter module in the prior art is still poor, and an inverter module is urgently needed to improve the current sharing effect of the inverter module in the prior art.
Disclosure of Invention
In view of this, the present invention provides an inverter module, and particularly shows an arrangement manner of each parallel switch tube in a multi-tube parallel inverter module and a lead-out manner of an output line of the inverter module, so that dynamic and static parasitic parameters of the inverter module can be optimized, and a current equalizing effect of the inverter can be optimized.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the application provides an inversion module, includes: the laminated busbar and the bridge arm of at least one phase; each phase of bridge arm comprises an upper bridge arm switching tube and a lower bridge arm switching tube, wherein the upper bridge arm switching tube comprises N upper switching tubes, and the lower bridge arm switching tube comprises N lower switching tubes; n is a positive integer; wherein:
in each phase of bridge arm, the N upper switch tubes and the N lower switch tubes are symmetrically arranged on the laminated busbar one by one;
each upper switch tube and each lower switch tube are respectively connected with the laminated busbar.
Optionally, the laminated busbar includes: the direct current positive busbar, the direct current negative busbar, the alternating current busbar and the outgoing busbar;
the direct-current positive busbar, the direct-current negative busbar and the alternating-current busbar are arranged in a laminated manner through insulating materials;
each upper switch tube and each lower switch tube are respectively connected with the alternating-current busbar, the direct-current positive busbar and the direct-current negative busbar;
the leading-out end of the outgoing line busbar is arranged on one side of the alternating current busbar.
Optionally, a through hole is formed in a preset position of the outgoing line busbar, so that the lengths of the confluence paths from the connection points of the upper switch tubes and the corresponding lower switch tubes in each phase of bridge arm to the output end of the outgoing line busbar are equal.
Optionally, the cross-sectional shape of the through hole is circular or elliptical.
Optionally, the output pins of the N upper switch tubes and the input pins of the N lower switch tubes are respectively connected to corresponding fins on the ac busbar.
Optionally, the leading-out end of the outgoing line busbar is positioned on any side of the alternating current busbar parallel to the symmetrically arranged center line.
Optionally, the leading-out end of the outgoing line busbar is positioned on any side of the alternating current busbar perpendicular to the symmetrically arranged center line.
Optionally, a preset included angle is kept between the outgoing line busbar and the alternating current busbar.
Optionally, the outgoing line busbar is perpendicular to the alternating current busbar.
Optionally, the upper switching tube and the lower switching tube are any one of a SIC MOS transistor, an IGBT module, or an MOS transistor.
As can be seen from the above technical solutions, the present invention provides an inverter module, including: the laminated bus bar and the bridge arms of at least one phase are provided, each bridge arm of each phase is provided with an upper bridge arm switching tube and a lower bridge arm switching tube, each upper bridge arm switching tube comprises N upper switching tubes, each lower bridge arm switching tube comprises N lower switching tubes, and N is a positive integer. Compared with the prior art, the scheme provided by the application arranges N upper switch tubes and N lower switch tubes in each phase of bridge arm on the laminated busbar in a one-to-one symmetrical manner, so that the path lengths of the currents flowing through the upper switch tubes at any moment tend to be consistent and the path lengths of the currents flowing through the lower switch tubes tend to be consistent, the dynamic parasitic inductance parameters of the inverter module are optimized, the dynamic current-sharing effect of the inverter module is improved, and the overall current-sharing effect of the inverter module is improved. In addition, the through holes are formed in the preset positions of the outgoing line bus bars, so that the lengths of the bus paths from the connection points of the upper and lower switch tubes in each phase of bridge arm to the output end of the outgoing line bus bar are equal, the static parasitic inductance parameters of the inverter module are optimized, and the static current equalizing effect between the upper and lower switch tubes in each pair is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 and 2 are schematic structural diagrams of an inverter module providing different viewing angles according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of an equivalent circuit of an inverter module according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, 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 an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In order to solve the overall poor problem of the effect of flow equalizing of the contravariant module among the prior art, this application embodiment provides an contravariant module, and its concrete structure includes: the laminated busbar and the bridge arm of at least one phase; each phase of bridge arm comprises an upper bridge arm switching tube and a lower bridge arm switching tube, wherein the upper bridge arm switching tube comprises N upper switching tubes, and the lower bridge arm switching tube comprises N lower switching tubes; wherein N is a positive integer.
N upper switch tubes and N lower switch tubes in each phase of bridge arm are symmetrically arranged on the laminated busbar one by one, and each upper switch tube and each lower switch tube are respectively connected with the laminated busbar.
Optionally, the N upper switching tubes and the N lower switching tubes are all any one of SIC MOS transistors (SIC Metal-Oxide-Semiconductor Field Effect transistors, silicon carbide Metal-Oxide-Semiconductor Field Effect transistors), IGBT (Insulated Gate Bipolar Transistor) modules, or MOS transistors (Metal-Oxide-Semiconductor Field Effect transistors).
The inverter module comprises at least one phase bridge arm, so the inverter module can be simplified, namely the inverter module comprises one phase bridge arm as an example for explanation; since each phase bridge arm includes N upper switching tubes and N lower switching tubes, any value of N may be exemplified, for example, each phase bridge arm includes six upper switches and six lower switching tubes; the specific structure of the simplified inverter module is shown in fig. 1 and 2, wherein the six upper switching tubes are a first upper switching tube Q1-1, a second upper switching tube Q1-2, a third upper switching tube Q1-3, a fourth upper switching tube Q1-4, a fifth upper switching tube Q1-5 and a sixth upper switching tube Q1-6, and the six lower switching tubes are a first lower switching tube Q2-1, a second lower switching tube Q2-2, a third lower switching tube Q2-3, a fourth lower switching tube Q2-4, a fifth lower switching tube Q2-5 and a sixth lower switching tube Q2-6.
In order to simplify the description, the inverter module is subjected to equivalent circuit changes; in actual operation, the connection between each switching tube and the laminated busbar can cause the input end and the output end of each switching tube to generate a parasitic inductance, namely, the parasitic inductance generated at the input end of the switching tube can be recorded as an input dynamic inductance, and the parasitic inductance generated at the output end of the switching tube can be recorded as an output dynamic inductance, so that in the equivalent transformation process of a circuit, in order to more simply show the electrical connection relationship of the circuit, the switching tube, the input dynamic inductance and the output dynamic inductance corresponding to the switching tube are equivalent to a switching branch circuit; in addition, a parasitic inductance is generated on a bus path of any upper switch tube and the lower switch tube connected with the upper switch tube, that is, the parasitic inductance can be regarded as the static inductance of the upper switch tube and the lower switch tube.
As shown in fig. 3, an equivalent circuit of the inverter module after performing equivalent change includes: the first upper switching branch 101, the second upper switching branch 102, the third upper switching branch 103, the fourth upper switching branch 104, the fifth upper switching branch 105, the sixth upper switching branch 106, the first lower switching branch 201, the second lower switching branch 202, the third lower switching branch 203, the fourth lower switching branch 204, the fifth lower switching branch 205, the sixth lower switching branch 206, the first static inductor Le1, the second static inductor Le2, the third static inductor Le3, the fourth static inductor Le4, the fifth static inductor Le5 and the sixth static inductor Le 6.
The input ends of the first upper switch branch 101, the second upper switch branch 102, the third upper switch branch 103, the fourth upper switch branch 104, the fifth upper switch branch 105 and the sixth upper switch branch 106 are all connected, and the connection point is used as the positive pole of the direct current side of the inverter module; the output ends of the first lower switching branch 201, the second lower switching branch 202, the third lower switching branch 203, the fourth lower switching branch 204, the fifth lower switching branch 205 and the sixth lower switching branch 206 are all connected, and the connection point is used as the negative pole of the dc side of the inverter module.
The output end of the first upper switching branch 101, the input end of the first lower switching branch 201 and one end of the first static inductor Le1 are all connected; the output end of the second upper switching branch 102, the input end of the second lower switching branch 202, and one end of the second static inductor Le2 are all connected; the output end of the third upper switching branch 103, the input end of the third lower switching branch 203 and one end of the third static inductor Le3 are all connected; the output end of the fourth upper switching branch 104, the input end of the fourth lower switching branch 204, and one end of the fourth static inductor Le4 are all connected; the output end of the fifth upper switching branch 105, the input end of the fifth lower switching branch 205, and one end of the fifth static inductor Le5 are all connected; the output terminal of the sixth upper switching branch 106, the input terminal of the sixth lower switching branch 206, and one terminal of the sixth static inductor Le6 are all connected.
The other end of the first static inductor Le1, the other end of the second static inductor Le2, the other end of the third static inductor Le3, the other end of the fourth static inductor Le4, the other end of the fifth static inductor Le5 and the other end of the sixth static inductor Le6 are all connected, and the connection point is used as an alternating current side output end of the inverter module.
Specifically, the first upper switching branch 101 has a specific structure as shown in fig. 3, and includes a first positive input dynamic inductor La1, a first upper switching tube Q1-1, and a first positive output dynamic inductor Lb 1.
One end of the first positive input dynamic inductor La1 serves as an input end of the first upper switch branch 101, the other end of the first positive input dynamic inductor La1 is connected to an input end of the first upper switch transistor Q1-1, an output end of the first upper switch transistor Q1-1 is connected to one end of the first positive output dynamic inductor Lb1, and the other end of the first positive output dynamic inductor Lb1 serves as an output end of the first upper switch branch 101.
It should be noted that the specific structures of the other switch branches are similar to the specific structure of the first upper switch branch 101, and may be derived by referring to the specific structure of the first upper switch branch 101, which is not described in detail herein; in addition, it should be noted that, in practical applications, the sum of the first positive input dynamic inductor La1 and the first positive output dynamic inductor Lb1 in the first upper switch branch 101 is referred to as a first positive dynamic inductor, and the remaining switch branches are the same as the first positive dynamic inductor, and are not described again.
Because the first upper switch tube Q1-1 and the first lower switch tube Q2-1 are symmetrically arranged on the laminated busbar, the commutation path is shortest, and other pairs of upper and lower switch tubes are also symmetrically arranged on the laminated busbar, and the commutation path is also shortest, so that the path lengths of current flowing through the upper switch tubes tend to be consistent, and the path lengths of current flowing through the lower switch tubes tend to be consistent, that is, in an equivalent circuit, the positive dynamic inductances of the upper switch branches tend to be consistent, and the negative dynamic inductances of the lower switch branches tend to be consistent, the dynamic current equalizing effect between the upper switch tubes and the dynamic current equalizing effect between the lower switch tubes are improved.
According to the scheme provided by the application, the N upper switch tubes and the N lower switch tubes in each phase of bridge arm are symmetrically arranged on the alternating-current busbar one by one, so that the path lengths of the currents flowing through the upper switch tubes at any moment tend to be consistent, and the path lengths of the currents flowing through the lower switch tubes tend to be consistent, the dynamic parasitic inductance parameters of the inverter module are optimized, the dynamic current-sharing effect of the inverter module is improved, and the overall current-sharing effect of the inverter module is improved.
On the basis of the foregoing embodiments, another embodiment of the present application provides a specific implementation manner of a laminated busbar, as shown in fig. 1, the specific structure includes: a dc positive bus bar (not shown), a dc negative bus bar (not shown), an ac bus bar 20 and a line outgoing bus bar 10.
The direct current positive busbar, the direct current negative busbar and the alternating current busbar 20 are stacked through an insulating material.
The input end of each upper switch tube is connected with a direct-current positive busbar, and the output end of each lower switch tube is connected with a direct-current negative busbar; the output end of each upper switch tube and the input end of each lower switch tube are respectively connected with an alternating current bus bar 20.
It should be noted that, in practical application, the output end of each upper switch tube is implemented as an output pin, and the input end of each lower switch tube is implemented as an input pin, so that the specific implementation manner that the output end of each upper switch tube and the input end of each lower switch tube are connected to the ac busbar 20 is as follows: the alternating-current busbar 20 is provided with 2N fins, and the output pin of each upper switch tube and the input pin of each lower switch tube are respectively connected with the corresponding fins on the alternating-current busbar 20.
In the present embodiment, the leading end 11 of the outlet busbar 10 is disposed on one side of the ac busbar 20. Specifically, the leading-out end 11 of the outgoing bus bar 10 may be located on any side of the ac bus bar 20 parallel to the symmetrically arranged center line (as shown in fig. 1), or may be located on any side of the ac bus bar 20 perpendicular to the symmetrically arranged center line (not shown), which is not specifically limited herein, and is within the protection scope of the present application as the case may be.
In addition, in the present embodiment, a preset included angle is maintained between the outgoing line busbar 10 and the alternating current busbar 20, where the preset included angle is an angle preset according to an actual situation, and a value range is 0 to 180 degrees; however, it should be noted that the preset included angle of 90 ° is an optimal implementation manner of the inverter module, and can be applied to most scenes, and the preset included angle of other angles can only be applied to some special scenes.
The rest of the structure and the working principle are the same as those of the above embodiments, and are not described in detail here.
In comparison with the above embodiments, the difference between the implementation of the inverter module provided in the embodiment of the present application and the implementation of the inverter module provided in the above embodiments is as follows:
through holes 13 (as shown in fig. 1) are formed in preset positions of the outgoing busbar 10, so that lengths of bus paths from connection points of the upper switch tubes and the corresponding lower switch tubes in each phase of bridge arms to an output end 12 of the outgoing busbar 10 are equal.
It should be noted that the preset position is a position pre-selected on the outgoing bus bar 10 according to the specific structure of the laminated bus bar and the actual arrangement condition of the switch tubes.
For better illustration, as in the above embodiments, the inverter module is described below as including a phase arm, and the phase arm includes six upper switching tubes and six lower switching tubes.
In practical application, if the leading-out end 11 of the outgoing busbar 10 is led out from the position shown in fig. 1, it can be found by referring to fig. 2 that the leading-out end 11 of the outgoing busbar 10 is close to the fourth lower switching tube Q2-4 and the fifth lower switching tube Q2-5, the path length from the connection point of the fourth upper switching tube Q1-4 and the fourth lower switching tube Q2-4 and the connection point of the fifth upper switching tube Q1-5 and the fifth lower switching tube Q2-5 to the output end 12 of the outgoing busbar 10 is shortest, and the path length from the connection point of the first upper switching tube Q1-1 and the first lower switching tube Q2-1 to the output end 12 of the outgoing busbar 10 is longest; therefore, the through hole 13 is arranged at the preset position of the outgoing bus bar 10, and the path from the connection point of the fourth upper switch tube Q1-4 and the fourth lower switch tube Q2-4 and the path from the connection point of the fifth upper switch tube Q1-5 and the fifth lower switch tube Q2-5 to the output end 12 of the outgoing bus bar 10 are lengthened, so that the path lengths from the connection points of each pair of upper and lower switch tubes to the output end 12 of the outgoing bus bar 10 tend to be consistent, that is, in an equivalent circuit, the inductance values of the first static inductance Le1 to the sixth static inductance Le6 tend to be consistent, and therefore, the static current equalizing effect between each pair of upper and lower switch tubes is improved.
Therefore, the same principle can be used for pushing out, when the leading-out end 11 of the outgoing line busbar 10 is replaced by a position, the through hole 13 also adaptively changes the position of the through hole, and then the function of improving the overall static current equalizing effect of the inverter module is realized.
As can be seen from the above, compared to the above embodiments, the present embodiment further improves the overall current sharing effect of the inverter module by improving the static current sharing effect.
Optionally, in practical application, the shape of the through hole 13 may be a circle or an ellipse, which is not specifically limited herein, and may be selected according to practical situations, as long as the shape capable of achieving the above effects is within the protection scope of the present application.
The rest of the structure and the working principle are the same as those of the above embodiments, and are not described in detail here.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An inverter module, comprising: the laminated busbar and the bridge arm of at least one phase; each phase of bridge arm comprises an upper bridge arm switching tube and a lower bridge arm switching tube, wherein the upper bridge arm switching tube comprises N upper switching tubes, and the lower bridge arm switching tube comprises N lower switching tubes; n is a positive integer; wherein:
in each phase of bridge arm, the N upper switch tubes and the N lower switch tubes are symmetrically arranged on the laminated busbar one by one;
each upper switch tube and each lower switch tube are respectively connected with the laminated busbar.
2. The inverter module according to claim 1, wherein the laminated busbar includes: the direct current positive busbar, the direct current negative busbar, the alternating current busbar and the outgoing busbar;
the direct-current positive busbar, the direct-current negative busbar and the alternating-current busbar are arranged in a laminated manner through insulating materials;
each upper switch tube and each lower switch tube are respectively connected with the alternating-current busbar, the direct-current positive busbar and the direct-current negative busbar;
the leading-out end of the outgoing line busbar is arranged on one side of the alternating current busbar.
3. The inverter module according to claim 2, wherein through holes are formed in preset positions of the outgoing bus bar, so that the lengths of the bus paths from the connection points of the upper switch tubes and the corresponding lower switch tubes in each phase of bridge arms to the output ends of the outgoing bus bar are equal.
4. The inverter module according to claim 3, wherein the through-hole has a circular or elliptical cross-sectional shape.
5. The inverter module according to claim 2, wherein the output pins of the N upper switching tubes and the input pins of the N lower switching tubes are respectively connected to corresponding fins on the ac busbar.
6. The inverter module of claim 2, wherein the leading-out ends of the outgoing line bus bars are positioned on any side of the alternating current bus bars parallel to the symmetrically arranged center lines.
7. The inverter module of claim 2, wherein the leading-out ends of the outgoing busbar are positioned on any side of the alternating-current busbar perpendicular to the symmetrically arranged center line.
8. The inverter module of claim 2, wherein a preset included angle is maintained between the outgoing busbar and the alternating-current busbar.
9. The inverter module according to claim 8, wherein the outlet busbar is perpendicular to the AC busbar.
10. The inverter module according to any one of claims 1 to 9, wherein the upper switching transistor and the lower switching transistor are each any one of a silicon carbide metal-oxide-semiconductor field effect transistor (SIC MOS transistor), an insulated gate bipolar transistor module (IGBT module), or a metal-oxide-semiconductor field effect transistor (MOS transistor).
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| CN201911324271.1A CN110971137A (en) | 2019-12-18 | 2019-12-18 | Inversion module |
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|---|---|---|---|
| CN201911324271.1A CN110971137A (en) | 2019-12-18 | 2019-12-18 | Inversion module |
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