CN217883246U

CN217883246U - Optimization circuit of NPC-I three-level converter and three-phase NPC-I type three-level converter

Info

Publication number: CN217883246U
Application number: CN202220918760.0U
Authority: CN
Inventors: 李明才; 郭晓兵; 齐海艳; 马现良
Original assignee: Beijing Xingshi Technology Co ltd
Current assignee: Beijing Xingshi Technology Co ltd
Priority date: 2022-04-20
Filing date: 2022-04-20
Publication date: 2022-11-22
Anticipated expiration: 2032-04-20

Abstract

The utility model provides a NPC-I three-level converter's optimization circuit and three-phase NPC-I type three-level converter relates to power device technical field. The utility model discloses a main topological semiconductor of NPC-I three level converter's optimization 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, first connecting wire, and the distance of second connecting wire is short, if need add absorption capacitance and also very well place between the positive and negative of P module and N module, this layout design can reduce the radiator area, and the cost is reduced reduces current return circuit size, reduces the return circuit inductance, reduces the semiconductor turn-off peak voltage, further reduces peak voltage absorption capacitance's specification.

Description

Optimization circuit of NPC-I three-level converter and three-phase NPC-I type three-level converter

Technical Field

The utility model relates to a power device technical field, concretely relates to NPC-I three level current transformer's optimization circuit and three-phase NPC-I type three level current transformer.

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 current transformer's optimization circuit and three-phase NPC-I type three level current transformer has solved current NPC-I three level current transformer 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 an optimization circuit for NPC-I three-level converter, including: three identical power switch tube modules, wherein,

in the first power switch tube 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 an alternating current output end, the collecting electrode of the first power switch tube is connected with a first connecting wire, and the emitting electrode of the second power switch tube is connected with a second connecting wire;

in the second power switch tube module, an emitter of a third power switch tube is connected with a collector 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 of the third power switch tube is connected with a direct current positive pole DC +, and the emitter of the fourth power switch tube is connected with a direct current neutral line DC0;

in the third power switch tube module, an emitter of a fifth power switch tube is connected with a collector of a sixth power switch tube, a common end of the fifth power switch tube and the sixth power switch tube is connected with a second connecting wire, the collector of the fifth power switch tube is connected with a direct current neutral line DC0, and the emitter of the sixth power switch tube is connected with a direct current cathode DC-.

Preferably, 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 are all IGBTs.

Preferably, each IGBT is connected in anti-parallel with a freewheeling diode.

In a second aspect, the present invention provides a layout structure of an optimized circuit of an NPC-I three-level converter as described above, including: the second power switch tube module, the first power switch tube module and the third power switch tube module are sequentially arranged from top to bottom, the connecting terminal connected with the first connecting wire or the second connecting wire is arranged on the first side, and the alternating current output end and the connecting terminal connected with the direct current negative electrode, the direct current positive electrode and the direct current neutral wire are arranged on the second side.

The third aspect, the utility model provides a three-phase NPC-I type three-level converter, including first bus-bar capacitance, second bus-bar capacitance and U, V, W three-phase circuit, every looks circuit of U, V, W all includes as above-mentioned NPC-I three-level converter's optimization circuit.

(III) advantageous effects

The utility model provides a three level converter's of NPC-I optimization circuit and three-phase NPC-I type three level converter. 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 optimization 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, first connecting wire, and the distance of second connecting wire is short, if need add absorption capacitance and also place very well between the positive and negative of second power switch tube module and third power switch tube module, this overall arrangement design can reduce the radiator area, and reduce the cost reduces the electric current return circuit size, reduces the return circuit inductance, reduces the semiconductor turn-off peak voltage, further reduces the specification of peak voltage absorption capacitance.

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 some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a circuit diagram of a prior art three-phase NPC-I three-level converter;

fig. 2 is a main topology diagram of a single-phase NPC-I type three-level according to an embodiment of the present invention;

FIG. 3 is a layout diagram of the circuit of FIG. 2;

fig. 4 is an adapter board and a driver board for the structural layout of the circuit shown in fig. 3.

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 in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The embodiment of the application provides an optimization circuit of an NPC-I three-level converter and a three-phase NPC-I type three-level converter, solves the technical problems that the existing NPC-I three-level converter is scattered in devices and not beneficial to layout design of follow-up circuits, realizes modular design and facilitates layout of a circuit structure.

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 NPC-I three-level converter's optimization circuit specifically is a three-phase NPC-I three-level converter's optimization circuit. The conventional three-phase NPC-I three-level converter is shown in FIG. 1. The optimization circuit of the NPC-I three-level converter according to the embodiment of the present invention is described by taking one of the phase circuits of the circuit as an example.

As shown in fig. 2, the optimization circuit of the NPC-I three-level converter includes: an O module (a first power switch tube module), a P module (a second power switch tube module) and an N module (a third power switch tube module);

wherein, P module, N module and O module all include a power switch tube module, include two power switch tubes in every power switch tube module the embodiment of the utility model provides an in, power switch tube is IGBT.

In the O 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 an alternating current output end, the collecting electrode of the first power switch tube is connected with a first connecting wire, and the emitting electrode of the second power switch tube is connected with a second connecting wire;

in the P 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 a direct current neutral line DC0;

in the N module, an emitting electrode of a fifth power switch tube is connected with a collector electrode of a sixth power switch tube, a common end of the fifth power switch tube and the sixth power switch tube is connected with a second connecting wire, the collector electrode of the fifth power switch tube is connected with a direct current neutral line DC0, and the emitting electrode of the sixth power switch 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-T6 in the figure 2, and the first power switch tube module, the second power switch tube module and the third power switch tube module sequentially correspond to the O module, the P module and the N module in the figure 2.

The structural layout of the optimization circuit of the NPC-I three-level converter is shown in fig. 3, the P module, the O module, and the N module are sequentially arranged from top to bottom, the connection terminals connected to the first connection line or the second connection line are disposed on the same side, and the ac output terminal and the connection terminals connected to the dc negative electrode, the dc positive electrode, and the dc neutral line are disposed on the same side. In the structural layout, the modules are placed very compactly, the distance between the first connecting line and the second connecting line is short, and the P module and the N module are placed very well if absorption capacitors are added between the positive and negative electrodes of the modules. The whole layout is beneficial to reducing the area of the radiator, reducing a current loop and reducing the turn-off peak of the semiconductor device.

Fig. 4 shows the adapter board and the driving board corresponding to the P module, the O module and the N module in fig. 3. The adapter plates are welded and fixed to the corresponding modules by screws. As shown in the figure, the driving plate is made into a T shape, and a gray area is left for placing the absorption capacitors of the P module and the N module. The driving board and the adapter board are in female connection through the pin header, multipoint contact is adopted, installation is very convenient, a large number of driving wires can be saved, the steps of manual production and quality inspection are saved, the structure is simpler, the reliability is better, and the process quality problem of driving wire harnesses is not needed to worry.

The embodiment of the utility model provides a three-phase NPC-I type three-level converter is still provided, including 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 NPC-I three-level converter's optimization circuit.

In summary, compared with the prior art, the method has the following beneficial effects:

the utility model discloses a three level current transformer's of NPC-I optimization circuit's main topology semiconductor 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, first connecting wire, and the distance of second connecting wire is short, if need add absorption capacitance and also very well place between the positive and negative of P module and N module, this layout design can reduce the radiator area, and the cost is reduced reduces current return circuit size, reduces the return circuit inductance, reduces the semiconductor turn-off peak voltage, further reduces peak voltage absorption capacitance's specification.

It should be noted that, in this document, relational terms such as first and second, and the like are 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 the same; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand 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

1. An optimization circuit of an NPC-I three-level converter, comprising: three identical power switch tube modules, wherein,

in the third power switch tube module, an emitter of a fifth power switch tube is connected with a collector of a sixth power switch tube, a common end of the fifth power switch tube and the sixth power switch tube is connected with a second connecting wire, the collector of the fifth power switch tube is connected with a direct current neutral line DC0, and the emitter of the sixth power switch tube is connected with a direct current negative pole DC-.

2. The optimization circuit of the NPC-I three-level converter according to claim 1, wherein 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 are all IGBTs.

3. The optimization circuit of an NPC-I three-level converter according to claim 2, wherein each of the IGBTs is connected in anti-parallel with a freewheeling diode.

4. 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 the optimization circuit of the NPC-I three-level converter as claimed in any one of claims 1 to 3.