CN217984874U - Modular circuit of NPC _ I three-level converter and three-phase NPC-I type three-level converter - Google Patents
Modular circuit of NPC _ I three-level converter and three-phase NPC-I type three-level converter Download PDFInfo
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- CN217984874U CN217984874U CN202220918786.5U CN202220918786U CN217984874U CN 217984874 U CN217984874 U CN 217984874U CN 202220918786 U CN202220918786 U CN 202220918786U CN 217984874 U CN217984874 U CN 217984874U
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Abstract
The utility model provides a three level current transformer's of NPC _ I modular circuit reaches three level current transformer of three-phase NPC-I type relates to power device technical field. The utility model discloses a main topological semiconductor of NPC _ I three-level converter's modular circuit chooses for use same power switch tube module to carry out the modularized design, reduces the BOM kind, makes things convenient for the circuit structure overall arrangement. And simultaneously, the utility model discloses in, each module is placed very compactly to reduce the radiator area, reduce the cost, reduce the current loop size, reduce the return circuit inductance, reduce the semiconductor and turn-off peak voltage, further reduce peak voltage absorption capacitance's specification.
Description
Technical Field
The utility model relates to a power device technical field, concretely relates to NPC _ I three level converter's modular circuit and three-phase NPC-I type three level converter.
Background
A converter is an electrical device that varies the voltage, frequency, number of phases, and other electrical quantities or characteristics of a power system. The converter is widely applied to various power equipment and has various types. Compared with the traditional two-level converter, the NPC-I three-level converter has the advantages of higher voltage level, better output voltage waveform and the like. At present, the high-voltage switch is mature and applied to active front end or variable speed drive and other medium and high voltage industrial applications.
Taking a three-phase three-level converter as an example, a three-phase NPC-I three-level converter in the prior art is shown in fig. 1, and the three-level converter successfully solves the problem of voltage balancing due to the adoption of clamping diodes, so that the application of power electronic devices with low voltage level in a medium-high voltage converter system becomes possible. However, the existing NPC-I three-level converter devices are scattered, which is not beneficial to the layout design of the subsequent circuit.
SUMMERY OF THE UTILITY MODEL
Technical problem to be solved
The utility model provides a not enough to prior art, the utility model provides a NPC _ I three level converter's modular circuit and three-phase NPC-I type three level converter has solved current NPC-I three level converter device and has scattered, is unfavorable for the technical problem of the layout design of follow-up circuit.
(II) technical scheme
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
in a first aspect, the present invention provides a modular circuit of an NPC _ I three-level converter, including: the bridge type bridge circuit comprises a clamping module, an upper bridge arm module and a lower bridge arm module, wherein the clamping module, the upper bridge arm module and the lower bridge arm module respectively comprise a power switch tube module, and each power switch tube module comprises two power switch tubes; wherein,
in the clamping module, an emitting electrode of a first power switch tube is connected with a collecting electrode of a second power switch tube, a common end of the first power switch tube and the second power switch tube is connected with a direct current neutral line DC0, the collecting electrode of the first power switch tube is connected with an upper bridge arm module through a first connecting line, and the emitting electrode of the second power switch tube is connected with a lower bridge arm module through a second connecting line;
and the common end of the upper bridge arm module and the lower bridge arm module is an alternating current output end.
Preferably, in the upper bridge arm module, an emitter of the third power switching tube is connected to a collector of the fourth power switching tube, a common end of the third power switching tube and the fourth power switching tube is connected to the first connection line, a collector of the third power switching tube is connected to the DC positive electrode DC +, and an emitter of the fourth power switching tube is connected to the ac output terminal.
Preferably, in the lower bridge arm module, an emitter of a fifth power switching tube is connected to a collector of a sixth power switching tube, a common end of the fifth power switching tube and the sixth power switching tube is connected to the second connection line, the collector of the fifth power switching tube is connected to the ac output terminal, and the emitter of the sixth power switching tube is connected to the DC negative electrode DC-.
Preferably, the power switch tube is an IGBT.
Preferably, each power switch tube is connected with a freewheeling diode in reverse parallel.
Preferably, on the occasion of low current application, the clamping module, the upper bridge arm module and the lower bridge arm module are power switch tube modules with low current.
Preferably, in a large-current application occasion, the upper bridge arm module and the lower bridge arm module are large-current power switch tube modules, and the clamping module is a large-current power switch tube module or a small-current power switch tube module.
In a second aspect, the present invention provides a layout structure of a modular circuit of an NPC _ I three-level converter as described above, including: and sequentially arranging an upper arm bridge module, a clamping module and a lower arm bridge module, wherein all the modules are connected according to the modular circuit of the NPC _ I three-level converter.
The third aspect, the utility model provides a layout structure of NPC _ I three-level converter's modularization circuit, include: an upper arm bridge module, a clamping module and a lower arm bridge module are sequentially arranged, and all modules are connected with one another according to circuits of an NPC _ I three-level converter;
the clamping module comprises two diodes, the common end of a first diode and a second diode is connected with a direct current neutral line DC0, the first diode is connected with the upper bridge arm module through a first connecting wire, and the second diode is connected with the lower bridge arm module through a second connecting wire; the upper bridge arm module and the lower bridge arm module respectively comprise a power switch tube module, and the common end of the upper bridge arm module and the lower bridge arm module is an alternating current output end.
In a fourth aspect, the embodiment of the present invention provides a three-phase NPC-I type three-level converter, including the first half bus capacitor, the second half bus capacitor and U, V, W three-phase circuits, wherein each phase circuit of U, V, W includes the modular circuit of the NPC _ I three-level converter as described above.
(III) advantageous effects
The utility model provides a three level current converter's of NPC _ I modular circuit and three-phase NPC-I type three level current converter. Compared with the prior art, the method has the following beneficial effects:
the utility model discloses a main topology semiconductor of NPC _ I three-level converter's modularization circuit chooses same power switch tube module for use to carry out the modularized design, reduces the BOM kind, makes things convenient for the circuit structure overall arrangement. And simultaneously, the utility model discloses in, each module is placed very compactly to reduce the radiator area, reduce the cost, reduce the current loop size, reduce the return circuit inductance, reduce the semiconductor and turn-off peak voltage, further reduce peak voltage absorption capacitance's specification.
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 description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of a conventional three-phase NPC-I three-level converter;
fig. 2 is a topology diagram of a modular circuit of an NPC _ I three-level converter according to an embodiment of the present invention;
FIG. 3 is a structural layout diagram of the topology diagram shown in FIG. 2 in an application where current is relatively small;
FIG. 4 is a layout diagram of the topology shown in FIG. 2 for relatively high current applications;
fig. 5 is a structural layout diagram of the clamping module in fig. 4 replaced by a low-current power switch tube module.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without making creative efforts belong to the protection scope of the present invention.
The embodiment of the application provides a modular circuit of the NPC _ I three-level converter, solves the technical problems that the existing NPC-I three-level converter is scattered and is not beneficial to layout design of subsequent circuits, realizes modular design and facilitates circuit structure layout.
In order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
The embodiment of the utility model provides a modular circuit of NPC _ I three-level converter, current three-phase NPC-I three-level converter is as shown in figure 1. The modular circuit of the NPC _ I three-level converter according to the embodiment of the present invention is described by taking one phase circuit of the circuit as an example.
As shown in fig. 2, the modular circuit of the NPC _ I three-level converter includes: the three modules comprise power switch tube modules, each power switch tube module comprises two power switch tubes, and each power switch tube is connected with a fly-wheel diode in parallel in a reverse direction. In the embodiment of the utility model provides an in, power switch is IGBT.
In the clamping module, an emitting electrode of a first power switch tube is connected with a collecting electrode of a second power switch tube, a common end of the first power switch tube and the second power switch tube is connected with a direct current neutral line DC0, a collecting electrode of the first power switch tube is connected with a first connecting line, and an emitting electrode of the second power switch tube is connected with a second connecting line.
In the upper bridge arm module, an emitting electrode of a third power switch tube is connected with a collector electrode of a fourth power switch tube, a common end of the third power switch tube and the fourth power switch tube is connected with a first connecting wire, the collector electrode of the third power switch tube is connected with a direct current anode DC +, and the emitting electrode of the fourth power switch tube is connected with an alternating current output end.
In the lower bridge arm module, an emitter of a fifth power switching tube is connected with a collector of a sixth power switching tube, a common end of the fifth power switching tube and the sixth power switching tube is connected with a second connecting wire, the collector of the fifth power switching tube is connected with an alternating current output end, and the emitter of the sixth power switching tube is connected with a direct current cathode DC-.
The first power switch tube, the second power switch tube, the third power switch tube, the fourth power switch tube, the fifth power switch tube and the sixth power switch tube correspond to T1 to T6 in fig. 2.
It should be noted that, in the implementation, the clamping module may also be composed of two conventional clamping diodes. The present application specifically describes replacing the clamp diodes of an existing NPC-I converter by clamp modules. BOM types are reduced, and circuit structure layout is facilitated.
The structural layout of the modular circuit of the NPC _ I three-level converter is shown in figures 3 to 5,
when the current of the application is small, three power switch tube modules with small current, such as FF650R17IE4, are selected. As shown in fig. 3, the upper arm bridge module, the clamp module, and the lower arm bridge module are sequentially arranged from top to bottom, and the modules are connected according to the circuit diagram of fig. 2 and the pin characteristics of the functional modules.
When the current of the application is larger, three power switch tube modules with large current, such as FF1000R17IE4 and FF1400R17IE4, are selected. As shown in fig. 4, the upper arm bridge module, the clamp module, and the lower arm bridge module are sequentially arranged from top to bottom, and the modules are connected according to the circuit diagram of fig. 2 and the pin characteristics of the functional modules. In a specific implementation process, because the current of the clamp module is pulsed, the clamp module can select a power switch tube module with a small current, and compared with the structural layout of fig. 4, the cost can be saved. The structural layout is shown in fig. 5.
The embodiment of the utility model provides a three-phase NPC-I type three-level converter is still provided, including DC power supply, first bus-bar capacitance, second bus-bar capacitance and U, V, W three-phase circuit, wherein, every looks circuit of U, V, W all includes as above-mentioned modular circuit.
In summary, compared with the prior art, the method has the following beneficial effects:
the utility model discloses a main topological semiconductor of NPC _ I three-level converter's modular circuit chooses for use same power switch tube module to carry out the modularized design, reduces the BOM kind, makes things convenient for the circuit structure overall arrangement. And simultaneously, the utility model discloses in, each module is placed very compactly to reduce the radiator area, reduce the cost, reduce the current loop size, reduce the return circuit inductance, reduce the semiconductor and turn-off peak voltage, further reduce peak voltage absorption capacitance's specification.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, 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 phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A modular circuit of an NPC _ I three-level converter, comprising: the bridge type bridge circuit comprises a clamping module, an upper bridge arm module and a lower bridge arm module, wherein the clamping module, the upper bridge arm module and the lower bridge arm module respectively comprise a power switch tube module, and each power switch tube module comprises two power switch tubes; wherein,
in the clamping module, an emitting electrode of a first power switch tube is connected with a collecting electrode of a second power switch tube, a common end of the first power switch tube and the second power switch tube is connected with a direct current neutral line DC0, the collecting electrode of the first power switch tube is connected with an upper bridge arm module through a first connecting line, and the emitting electrode of the second power switch tube is connected with a lower bridge arm module through a second connecting line;
and the common end of the upper bridge arm module and the lower bridge arm module is an alternating current output end.
2. The modular circuit of the NPC _ I three-level converter as claimed in claim 1, wherein in the upper bridge arm module, an emitter of the third power switch tube is connected to a collector of the fourth power switch tube, a common terminal of the third power switch tube and the fourth power switch tube is connected to the first connection line, a collector of the third power switch tube is connected to the DC positive electrode DC +, and an emitter of the fourth power switch tube is connected to the ac output terminal.
3. The modular circuit of the NPC _ I three-level converter according to claim 1, wherein in the lower bridge arm module, an emitter of a fifth power switch tube is connected to a collector of a sixth power switch tube, a common terminal of the fifth power switch tube and the sixth power switch tube is connected to the second connection line, the collector of the fifth power switch tube is connected to the ac output terminal, and the emitter of the sixth power switch tube is connected to the DC negative DC-.
4. The modular circuit of the NPC _ I three-level converter according to claim 1, wherein the power switch tube is an IGBT.
5. The modular circuit of the NPC _ I three-level converter of claim 1, wherein each of the power switching tubes is connected in anti-parallel with a freewheeling diode.
6. The modular circuit of the NPC _ I three-level converter as claimed in any of claims 1 to 5, wherein the clamping module, the upper arm module and the lower arm module are power switching tube modules with small current in small current application.
7. The modular circuit of the NPC _ I three-level converter as claimed in any of claims 1 to 5, wherein in a high current application, the upper bridge arm module and the lower bridge arm module are selected from a high current power switch tube module, and the clamping module is selected from a high current power switch tube module or a low current power switch tube module.
8. A three-phase NPC-I type three-level converter comprises an upper half bus capacitor, a lower half bus capacitor and a U, V and W three-phase circuit, wherein each U, V and W phase circuit comprises a modular circuit of the NPC-I three-level converter as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220918786.5U CN217984874U (en) | 2022-04-20 | 2022-04-20 | Modular circuit of NPC _ I three-level converter and three-phase NPC-I type three-level converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220918786.5U CN217984874U (en) | 2022-04-20 | 2022-04-20 | Modular circuit of NPC _ I three-level converter and three-phase NPC-I type three-level converter |
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| CN217984874U true CN217984874U (en) | 2022-12-06 |
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| CN202220918786.5U Active CN217984874U (en) | 2022-04-20 | 2022-04-20 | Modular circuit of NPC _ I three-level converter and three-phase NPC-I type three-level converter |
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