CN114337340A - Three-level converter - Google Patents
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- CN114337340A CN114337340A CN202011069105.4A CN202011069105A CN114337340A CN 114337340 A CN114337340 A CN 114337340A CN 202011069105 A CN202011069105 A CN 202011069105A CN 114337340 A CN114337340 A CN 114337340A
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Abstract
The invention discloses a three-level converter, comprising: the half-bridge device comprises a half-bridge device consisting of a first half-bridge module, a second half-bridge module and a third half-bridge module, a first capacitor and a second capacitor; wherein: the first capacitor is connected in series with the second capacitor; a half-bridge arrangement consisting of a first half-bridge module, a second half-bridge module and a third half-bridge module is connected to the first capacitor and the second capacitor, respectively. The three-level converter provided by the invention is formed by three half-bridge modules and two groups of capacitors, and compared with the conventional layout mode that 6 switching devices are formed by 6 single-tube modules, the three-level converter reduces circuit connection wires, reduces stray inductance, inhibits voltage spikes in the switching transient process, and further protects the switching devices in the three-level converter.
Description
Technical Field
The invention relates to the technical field of converters, in particular to a three-level converter.
Background
With the improvement of the national policies and standards for the matching of distributed power supply projects, the distributed power supply, especially the distributed photovoltaic power generation, will show a rapid development trend in a long period of time in the future. With the access of a large amount of distributed energy, the construction and development of the power distribution network in China can be widely influenced. With the rapid development of the fully-controlled power semiconductor technology, a new opportunity is brought to the stage of power transmission and distribution of direct-current electric energy, and the power electronic converter can convert alternating current and direct current of electric power into each other (the alternating current is converted into the direct current, namely rectification, the direct current is converted into the alternating current, namely inversion, the direct current is converted into the direct current, namely chopping, the alternating current is converted into the alternating current, namely frequency conversion), so that the research and the application are vigorous.
The three-level converter has the characteristics of low voltage grade of a switching device and small output ripple, becomes a mainstream product in the field of medium-high voltage conversion, and has applications including the current micro-grid and high-voltage direct-current transmission. However, as shown in fig. 1 and 2, the 6 switching devices of the conventional three-level converter are formed by 6 single-tube modules, so that the conventional three-level converter has a large floor area, poor performance uniformity among the modules, and is prone to cause non-uniformity of the switching devices.
Therefore, how to reasonably arrange the modules of the three-level converter to reduce the circuit connection, reduce the stray inductance, suppress the voltage spike in the switch transient process and further protect the switch device is a problem to be solved urgently.
Disclosure of Invention
In view of this, the present invention provides a three-level converter, which can perform reasonable layout on modules of the three-level converter to reduce circuit connection, reduce stray inductance, suppress voltage spikes in a switching transient process, and further protect a switching device.
The present invention provides a three-level converter, comprising: the half-bridge device comprises a half-bridge device consisting of a first half-bridge module, a second half-bridge module and a third half-bridge module, a first capacitor and a second capacitor; wherein:
the first capacitor is connected in series with the second capacitor;
the half-bridge device composed of the first half-bridge module, the second half-bridge module and the third half-bridge module is respectively connected with the first capacitor and the second capacitor.
Preferably, pin 3 of the first half-bridge module is connected with the first end of the first capacitor;
the 4 th pin of the first half-bridge module is connected with the second end of the first capacitor;
the 11 th pin and the 10 th pin of the first half-bridge module are respectively connected with the 3 rd pin of the second half-bridge module;
the 4 th pin of the second half-bridge module is connected with the 11 th pin and the 10 th pin of the third half-bridge module;
the 11 th pin and the 10 th pin of the second half-bridge module are connected with an output end;
a pin 3 of the third half-bridge module is connected with a first end of the second capacitor;
the 4 th pin of the third half-bridge module is connected with the second end of the second capacitor;
the first end of the first capacitor is connected with the positive electrode;
the series midpoint of the second end of the first capacitor and the first end of the second capacitor is connected with the output end;
the second terminal of the second capacitor is connected to the negative electrode.
Preferably, the first half-bridge module comprises: a first switching device and a fifth switching device;
the second half-bridge module includes: a second switching device and a third switching device;
the third half-bridge module includes: a sixth switching device and a fourth switching device; wherein:
the first switching device includes: the first triode, the first diode and the first capacitor;
the second switching device includes: the second triode, the second diode and the second capacitor;
the third switching device includes: a third triode, a third diode and a third capacitor;
the fourth switching device includes: the fourth triode, the fourth diode and the fourth capacitor;
the fifth switching device includes: a fifth triode, a fifth diode and a fifth capacitor;
the sixth switching device includes: a sixth triode, a sixth diode and a sixth capacitor, wherein:
the anode of the first diode is connected with the emitter of the first triode;
the negative electrode of the first diode is connected with the collector electrode of the first triode;
two ends of the first capacitor are respectively connected with a collector and an emitter of the first triode;
the collector of the first triode is connected with the first end of the first capacitor;
the emitter of the first triode is respectively connected with the collector of the second triode and the collector of the fifth triode;
the anode of the fifth diode is connected with the emitter of the fifth triode;
the negative electrode of the fifth diode is connected with the collector electrode of the fifth triode;
two ends of the fifth capacitor are respectively connected with a collector and an emitter of the fifth triode;
an emitter of the fifth triode is connected with a collector of the sixth triode;
the series connection midpoint of the emitter of the fifth triode and the collector of the sixth triode is connected with the output end;
the anode of the second diode is connected with the emitter of the second triode;
the negative electrode of the second diode is connected with the collector electrode of the second triode;
two ends of the second capacitor are respectively connected with a collector and an emitter of the second triode;
the emitter of the second triode is connected with the collector of the third triode;
the series connection midpoint of the emitter of the second triode and the collector of the third triode is connected with the output end;
the anode of the third diode is connected with the emitter of the third triode;
the negative electrode of the third diode is connected with the collector electrode of the third triode;
two ends of the third capacitor are respectively connected with a collector and an emitter of the third triode;
the emitter of the third triode is connected with the collector of the fourth triode;
the series connection midpoint of the emitter of the third triode and the collector of the fourth triode is connected with the emitter of the sixth triode;
the anode of the sixth diode is connected with the emitter of the sixth triode;
the cathode of the sixth diode is connected with the collector of the sixth triode;
two ends of the sixth capacitor are respectively connected with a collector and an emitter of the sixth triode;
the anode of the fourth diode is connected with the emitter of the fourth triode;
the negative electrode of the fourth diode is connected with the collector electrode of the fourth triode;
two ends of the fourth capacitor are respectively connected with a collector and an emitter of the fourth triode;
and the emitter of the fourth triode is connected with the second end of the second capacitor.
Preferably, the first switching device, the second switching device, the third switching device and the fourth switching device are power devices respectively, and the fifth switching device and the sixth switching device are clamping devices.
In summary, the present invention discloses a three-level converter, including: the half-bridge device comprises a half-bridge device consisting of a first half-bridge module, a second half-bridge module and a third half-bridge module, a first capacitor and a second capacitor; wherein: the first capacitor is connected in series with the second capacitor; and a half-bridge device consisting of the first half-bridge module, the second half-bridge module and the third half-bridge module is respectively connected with the first capacitor and the second capacitor. The three-level converter provided by the invention is formed by three half-bridge modules and two groups of capacitors, and compared with the conventional layout mode that 6 switching devices are formed by 6 single-tube modules, the three-level converter reduces circuit connection wires, reduces stray inductance, inhibits voltage spikes in the switching transient process, and further protects the switching devices in the three-level converter.
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 the drawings without creative efforts.
Fig. 1 is a circuit schematic diagram of a three-level converter disclosed in the prior art;
FIG. 2 is a circuit schematic of another three-level converter disclosed in the prior art;
fig. 3 is a schematic structural diagram of an embodiment 1 of a three-level converter according to the present disclosure;
fig. 4 is a circuit diagram of an embodiment 2 of a three-level converter according to the disclosure;
fig. 5 is a circuit diagram of an embodiment 3 of a three-level converter according to the 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.
As shown in fig. 3, which is a schematic structural diagram of an embodiment 1 of a three-level converter disclosed in the present invention, the three-level converter may include: a half-bridge arrangement 31 composed of a first half-bridge module 311, a second half-bridge module 312, and a third half-bridge module 313, a first capacitor 32, and a second capacitor 33; wherein:
the first capacitor 32 is connected in series with the second capacitor 33;
the half-bridge arrangement 31, which is composed of a first half-bridge module 311, a second half-bridge module 312 and a third half-bridge module 313, is connected to a first capacitor 32 and a second capacitor 33, respectively.
The three-level converter provided by the embodiment is formed by three half-bridge modules and two groups of capacitors, and compared with the existing layout mode that 6 switching devices are formed by 6 single-tube modules as shown in fig. 1 and fig. 2, the three-level converter reduces circuit connection wires, reduces stray inductance, inhibits voltage spikes in the switching transient process, and further protects the switching devices in the three-level converter.
As shown in fig. 4, which is a circuit schematic diagram of an embodiment 2 of a three-level converter disclosed in the present invention, the three-level converter may include: a first half-bridge Module1, a second half-bridge Module2, a third half-bridge Module3, a first capacitor C1 and a second capacitor C2; wherein:
a pin 3 of the first half-bridge Module1 is connected to a first end of a first capacitor C1;
the 4 th pin of the first half-bridge Module1 is connected to the second end of the first capacitor C1;
the 11 th pin and the 10 th pin of the first half-bridge Module1 are respectively connected with the 3 rd pin of the second half-bridge Module 2;
the 4 th pin of the second half-bridge Module2 is connected with the 11 th pin and the 10 th pin of the third half-bridge Module 3;
the 11 th pin and the 10 th pin of the second half-bridge Module2 are connected with an output end;
a pin 3 of the third half-bridge Module3 is connected to a first terminal of a second capacitor C2;
the 4 th pin of the third half-bridge Module3 is connected to the second terminal of the second capacitor C2;
a first terminal of the first capacitor C1 is connected to the positive electrode;
the series midpoint of the second terminal of the first capacitor C1 and the first terminal of the second capacitor C2 is connected to the output terminal;
a second terminal of the second capacitor C2 is connected to the negative electrode.
The three-level converter provided by the embodiment adopts the first half-bridge Module1, the second half-bridge Module2, the third half-bridge Module3, and the two sets of capacitors of the first capacitor C1 and the second capacitor C2, and compared with the existing layout mode that 6 switching devices shown in fig. 1 are composed of 6 single-tube modules, the three-level converter reduces circuit connection lines, reduces stray inductance, suppresses voltage spikes in the switching transient process, and further protects the switching devices in the three-level converter.
As shown in fig. 5, which is a schematic circuit diagram of an embodiment 3 of a three-level converter disclosed in the present invention, the three-level converter may include: a first half-bridge Module1, a second half-bridge Module2, a third half-bridge Module3, a first capacitor C1 and a second capacitor C2; wherein:
the first half-bridge Module1 includes: a first switching device S1 and a fifth switching device S5;
the second half-bridge Module2 includes: a second switching device S2 and a third switching device S3;
the third half-bridge Module3 includes: a sixth switching device S6 and a fourth switching device S4;
wherein the first switching device S1 includes: the first triode, the first diode and the first capacitor;
the second switching device S2 includes: the second triode, the second diode and the second capacitor;
the third switching device S3 includes: a third triode, a third diode and a third capacitor;
the fourth switching device S4 includes: the fourth triode, the fourth diode and the fourth capacitor;
the fifth switching device S5 includes: a fifth triode, a fifth diode and a fifth capacitor;
the sixth switching device S6 includes: a sixth triode, a sixth diode and a sixth capacitor, wherein:
the anode of the first diode is connected with the emitter of the first triode;
the negative electrode of the first diode is connected with the collector electrode of the first triode, and two ends of the first capacitor are respectively connected with the collector electrode and the emitter electrode of the first triode;
the collector of the first triode is connected with the first end of a first capacitor C1;
the emitter of the first triode is respectively connected with the collector of the second triode and the collector of the fifth triode;
the anode of the fifth diode is connected with the emitter of the fifth triode;
the negative electrode of the fifth diode is connected with the collector electrode of the fifth triode;
two ends of the fifth capacitor are respectively connected with a collector and an emitter of the fifth triode;
an emitter of the fifth triode is connected with a collector of the sixth triode;
the series midpoint of the emitter of the fifth triode and the collector of the sixth triode is connected with the output end;
the anode of the second diode is connected with the emitter of the second triode;
the negative electrode of the second diode is connected with the collector electrode of the second triode;
two ends of the second capacitor are respectively connected with a collector and an emitter of the second triode;
the emitter of the second triode is connected with the collector of the third triode;
the series midpoint of the emitter of the second triode and the collector of the third triode is connected with the output end;
the anode of the third diode is connected with the emitter of the third triode;
the negative electrode of the third diode is connected with the collector electrode of the third triode;
two ends of the third capacitor are respectively connected with a collector and an emitter of the third triode;
the emitter of the third triode is connected with the collector of the fourth triode;
the series connection midpoint of the emitter of the third triode and the collector of the fourth triode is connected with the emitter of the sixth triode;
the anode of the sixth diode is connected with the emitter of the sixth triode;
the cathode of the sixth diode is connected with the collector of the sixth triode;
two ends of the sixth capacitor are respectively connected with a collector and an emitter of the sixth triode;
the anode of the fourth diode is connected with the emitter of the fourth triode;
the negative electrode of the fourth diode is connected with the collector electrode of the fourth triode, and two ends of the fourth capacitor are respectively connected with the collector electrode and the emitter electrode of the fourth triode;
the emitter of the fourth transistor is connected to the second terminal of the second capacitor C2.
In the above embodiment, the three-level converter is composed of 6 switching devices and two sets of capacitors, where the 6 switching devices are composed of three half-bridge modules, and the first half-bridge Module1 composed of the first switching device S1 and the fifth switching device S5, the second half-bridge Module2 composed of the second switching device S2 and the third switching device S3, and the third half-bridge Module3 composed of the sixth switching device S6 and the fourth switching device S4 respectively reduce circuit connections, reduce stray inductance, suppress voltage spikes during switching transients, and further protect the switching devices in the three-level converter, compared with the conventional layout mode in which 6 switching devices are composed of 6 single-transistor modules as shown in fig. 2.
Specifically, the first switching device, the second switching device, the third switching device, and the fourth switching device in the three-level converter provided in this embodiment may be power devices, and the fifth switching device and the sixth switching device may be clamping devices, respectively.
Specifically, the heat dissipation method of the three-level converter provided by this embodiment may be air cooling, water cooling, or other cooling methods.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
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 steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
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 (4)
1. A three-level converter, comprising: the half-bridge device comprises a half-bridge device consisting of a first half-bridge module, a second half-bridge module and a third half-bridge module, a first capacitor and a second capacitor; wherein:
the first capacitor is connected in series with the second capacitor;
the half-bridge device composed of the first half-bridge module, the second half-bridge module and the third half-bridge module is respectively connected with the first capacitor and the second capacitor.
2. The three-level converter according to claim 1, wherein pin 3 of said first half-bridge module is connected to a first terminal of said first capacitor;
the 4 th pin of the first half-bridge module is connected with the second end of the first capacitor;
the 11 th pin and the 10 th pin of the first half-bridge module are respectively connected with the 3 rd pin of the second half-bridge module;
the 4 th pin of the second half-bridge module is connected with the 11 th pin and the 10 th pin of the third half-bridge module;
the 11 th pin and the 10 th pin of the second half-bridge module are connected with an output end;
a pin 3 of the third half-bridge module is connected with a first end of the second capacitor;
the 4 th pin of the third half-bridge module is connected with the second end of the second capacitor;
the first end of the first capacitor is connected with the positive electrode;
the series midpoint of the second end of the first capacitor and the first end of the second capacitor is connected with the output end;
the second terminal of the second capacitor is connected to the negative electrode.
3. The three-level converter according to claim 2, wherein the first half-bridge module comprises: a first switching device and a fifth switching device;
the second half-bridge module includes: a second switching device and a third switching device;
the third half-bridge module includes: a sixth switching device and a fourth switching device; wherein:
the first switching device includes: the first triode, the first diode and the first capacitor;
the second switching device includes: the second triode, the second diode and the second capacitor;
the third switching device includes: a third triode, a third diode and a third capacitor;
the fourth switching device includes: the fourth triode, the fourth diode and the fourth capacitor;
the fifth switching device includes: a fifth triode, a fifth diode and a fifth capacitor;
the sixth switching device includes: a sixth triode, a sixth diode and a sixth capacitor, wherein:
the anode of the first diode is connected with the emitter of the first triode;
the negative electrode of the first diode is connected with the collector electrode of the first triode;
two ends of the first capacitor are respectively connected with a collector and an emitter of the first triode;
the collector of the first triode is connected with the first end of the first capacitor;
the emitter of the first triode is respectively connected with the collector of the second triode and the collector of the fifth triode;
the anode of the fifth diode is connected with the emitter of the fifth triode;
the negative electrode of the fifth diode is connected with the collector electrode of the fifth triode;
two ends of the fifth capacitor are respectively connected with a collector and an emitter of the fifth triode;
an emitter of the fifth triode is connected with a collector of the sixth triode;
the series connection midpoint of the emitter of the fifth triode and the collector of the sixth triode is connected with the output end;
the anode of the second diode is connected with the emitter of the second triode;
the negative electrode of the second diode is connected with the collector electrode of the second triode;
two ends of the second capacitor are respectively connected with a collector and an emitter of the second triode;
the emitter of the second triode is connected with the collector of the third triode;
the series connection midpoint of the emitter of the second triode and the collector of the third triode is connected with the output end;
the anode of the third diode is connected with the emitter of the third triode;
the negative electrode of the third diode is connected with the collector electrode of the third triode;
two ends of the third capacitor are respectively connected with a collector and an emitter of the third triode;
the emitter of the third triode is connected with the collector of the fourth triode;
the series connection midpoint of the emitter of the third triode and the collector of the fourth triode is connected with the emitter of the sixth triode;
the anode of the sixth diode is connected with the emitter of the sixth triode;
the cathode of the sixth diode is connected with the collector of the sixth triode;
two ends of the sixth capacitor are respectively connected with a collector and an emitter of the sixth triode;
the anode of the fourth diode is connected with the emitter of the fourth triode;
the negative electrode of the fourth diode is connected with the collector electrode of the fourth triode;
two ends of the fourth capacitor are respectively connected with a collector and an emitter of the fourth triode;
and the emitter of the fourth triode is connected with the second end of the second capacitor.
4. The three-level converter according to claim 3, wherein the first, second, third and fourth switching devices are power devices, respectively, and the fifth and sixth switching devices are clamp devices.
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| CN202011069105.4A CN114337340A (en) | 2020-09-30 | 2020-09-30 | Three-level converter |
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| CN202011069105.4A CN114337340A (en) | 2020-09-30 | 2020-09-30 | Three-level converter |
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| JP2009232621A (en) * | 2008-03-24 | 2009-10-08 | Toshiba Mitsubishi-Electric Industrial System Corp | Power converter |
| CN102946205A (en) * | 2012-10-29 | 2013-02-27 | 华为技术有限公司 | Three-level inverter and power supply equipment |
| CN103401455A (en) * | 2013-06-26 | 2013-11-20 | 山西潞安环保能源开发股份有限公司 | Modulation method for active neutral-point clamp type tri-level inverter |
| CN104980054A (en) * | 2014-04-03 | 2015-10-14 | 施耐德东芝换流器欧洲公司 | Multi-level power converter |
| CN106655853A (en) * | 2015-07-22 | 2017-05-10 | 艾默生网络能源有限公司 | Three-level inverter |
| EP3174190A1 (en) * | 2015-11-24 | 2017-05-31 | ABB Schweiz AG | Three level converter |
| US20190052177A1 (en) * | 2017-08-10 | 2019-02-14 | Delta Electronics (Shanghai) Co., Ltd. | Power electronic conversion unit and system |
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2020
- 2020-09-30 CN CN202011069105.4A patent/CN114337340A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009232621A (en) * | 2008-03-24 | 2009-10-08 | Toshiba Mitsubishi-Electric Industrial System Corp | Power converter |
| CN102946205A (en) * | 2012-10-29 | 2013-02-27 | 华为技术有限公司 | Three-level inverter and power supply equipment |
| CN103401455A (en) * | 2013-06-26 | 2013-11-20 | 山西潞安环保能源开发股份有限公司 | Modulation method for active neutral-point clamp type tri-level inverter |
| CN104980054A (en) * | 2014-04-03 | 2015-10-14 | 施耐德东芝换流器欧洲公司 | Multi-level power converter |
| CN106655853A (en) * | 2015-07-22 | 2017-05-10 | 艾默生网络能源有限公司 | Three-level inverter |
| EP3174190A1 (en) * | 2015-11-24 | 2017-05-31 | ABB Schweiz AG | Three level converter |
| US20190052177A1 (en) * | 2017-08-10 | 2019-02-14 | Delta Electronics (Shanghai) Co., Ltd. | Power electronic conversion unit and system |
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