CN110868093B - Multi-level inverter circuit with high-voltage output - Google Patents

Multi-level inverter circuit with high-voltage output Download PDF

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CN110868093B
CN110868093B CN201911193235.6A CN201911193235A CN110868093B CN 110868093 B CN110868093 B CN 110868093B CN 201911193235 A CN201911193235 A CN 201911193235A CN 110868093 B CN110868093 B CN 110868093B
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switching element
capacitor
voltage
turned
output
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CN110868093A (en
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叶远茂
怡勇
王晓琳
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Guangdong University of Technology
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Guangdong University of Technology
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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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • 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
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
    • 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
    • H02M7/53871—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 with automatic control of output voltage or current

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

The embodiment of the invention relates to a high-voltage output multi-level inverter circuit which comprises a low-voltage direct-current power supply, at least five half-bridge units, at least four capacitor units and an output end, wherein each half-bridge unit comprises two switching elements which are connected in series; the five half-bridge units are respectively a first half-bridge unit, a second half-bridge unit, a third half-bridge unit, a fourth half-bridge unit and a fifth half-bridge unit; the four capacitor units are respectively a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit. The high-voltage output multi-level inverter circuit outputs the high-voltage alternating current of which the voltage output by a low-voltage direct-current power supply is converted into the voltage of the multi-level alternating current through the on or off of the switching elements on the five half-bridge units from the output end, so that the multi-level alternating current output is realized by adopting one power supply input, and the circuit structure of the high-voltage output multi-level inverter circuit is simple.

Description

Multi-level inverter circuit with high-voltage output
Technical Field
The invention relates to the technical field of power electronic inverter circuits, in particular to a multi-level inverter circuit with high voltage output.
Background
With the development of society, people have more and more demands on non-renewable resources, and non-renewable resources can be used up, so that petroleum, coal and other stone non-renewable energy sources are used by people and are less and less. Therefore, at present, the energy crisis and the energy pollution approach to each other step by step, and the acquisition of new energy has become very urgent, and the distributed power generation technology represented by wind energy and solar energy and the distributed energy storage technology represented by batteries and super capacitors are more and more highly regarded by various countries in the world. The development and application of these emerging energy sources and new technologies is highly dependent on the performance of power electronic inverter devices. Most of the existing power electronic inverter devices are realized by adopting a two-level inverter circuit, and the two-level inverter circuit has the defects of high harmonic content, low efficiency and the like.
With the rapid development of power electronic technology, most of the existing power electronic inverter devices adopt a multi-level inverter circuit to realize power conversion, and the multi-level inverter circuit has the advantages of low harmonic content of output voltage, low voltage stress of devices, less electromagnetic interference, higher efficiency and the like. Typical multilevel inverter circuits include diode clamped, capacitor clamped, and H-bridge cascaded. The diode clamping type and the capacitor clamping type have the problems that circuit clamping is complex and autonomous boosting is not achieved in a multi-level inverter circuit, and the H-bridge cascade type multi-level inverter circuit needs a plurality of independent direct-current power supplies, so that the multi-level inverter circuit is complex.
Therefore, in view of the above circumstances, how to design a multi-level inverter circuit having a simple circuit structure, a small number of input power supplies, and an autonomous boosting capability becomes an important technical problem to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a high-voltage output multi-level inverter circuit, which is used for solving the technical problems that a plurality of input direct-current power supplies are required and automatic boosting is not required in the conventional multi-level inverter circuit.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
a multi-level inverter circuit with high voltage output comprises a low-voltage direct current power supply, at least five half-bridge units, at least four capacitor units and an output end;
the half-bridge unit comprises two switching elements connected in series, and a node connected by the two switching elements is a first series node;
each capacitance unit comprises a capacitor and a diode connected with the capacitor in series, and the node of the capacitor connected with the diode is a second series node;
the five half-bridge units are respectively a first half-bridge unit, a second half-bridge unit, a third half-bridge unit, a fourth half-bridge unit and a fifth half-bridge unit; the four capacitor units are respectively a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit;
the first series node of the first half-bridge unit is connected with the first capacitor unit, and the first capacitor unit is also connected with the negative electrode of the low-voltage direct-current power supply;
the first series node of the second half-bridge unit is connected with the second capacitor unit, and the second capacitor unit is also connected with the anode of the low-voltage direct-current power supply;
the first series node of the third half-bridge unit is respectively connected with the third capacitor unit and the fourth capacitor unit, the third capacitor unit is further connected with the first capacitor unit, and the fourth capacitor unit is further connected with the second capacitor unit;
a first end of the output terminal is connected to the first series node of the fourth half-bridge cell, and a second end of the output terminal is connected to the first series node of the fifth half-bridge cell;
a first end of the fourth half-bridge cell is connected to the second series node of the fourth capacitive cell, and a second end of the fourth half-bridge cell is connected to the second series node of the third capacitive cell.
Preferably, the first half bridge unit includes a first switching element and a second switching element; the second half-bridge unit includes a third switching element and a fourth switching element; the third half-bridge cell includes a fifth switching element and a sixth switching element; the fourth half-bridge cell includes a seventh switching element and an eighth switching element; the fifth half-bridge cell includes a ninth switching element and a tenth switching element;
the first capacitance unit includes a first capacitor and a first diode; the second capacitance unit includes a second capacitor and a second diode; the third capacitance unit includes a third capacitor and a third diode; the fourth capacitance unit includes a fourth capacitor and a fourth diode; wherein the content of the first and second substances,
the first end of the first switching element, the first end of the third switching element and the cathode of the first diode are respectively connected with the negative electrode of the low-voltage direct-current power supply;
a second end of the second switching element, a second end of the fourth switching element and an anode of the second diode are respectively connected with a positive electrode of the low-voltage direct-current power supply;
a second terminal of the first switching element and a first terminal of the second switching element are connected to a second terminal of the first capacitor, respectively;
a second terminal of the third switching element and a first terminal of the fourth switching element are connected to a first terminal of the second capacitor, respectively;
a first end of the first capacitor, an anode of the first diode, a first end of the fifth switching element, and a cathode of the third diode are connected to a first end of the ninth switching element, respectively;
a second terminal of the second capacitor, a cathode of the second diode, a second terminal of the sixth switching element, and an anode of the fourth diode are connected to the second terminal of the tenth switching element, respectively;
a second terminal of the fifth switching element and a first terminal of the sixth switching element are connected to a second terminal of the third capacitor and a first terminal of the fourth capacitor, respectively;
a second terminal of the third capacitor and an anode of the third diode are respectively connected with a first terminal of the seventh switching element;
a second terminal of the fourth capacitor and a cathode of the fourth diode are respectively connected with a second terminal of the eighth switching element;
a second end of the seventh switching element and a first end of the eighth switching element are respectively connected to the first end of the output terminal, and a second end of the ninth switching element and a first end of the tenth switching element are respectively connected to the second end of the output terminal.
Preferably, if the first switching element, the fourth switching element, the fifth switching element, the eighth switching element, and the tenth switching element are turned on, and all other switching elements are turned off, the first capacitor and the second capacitor are respectively connected in series with the low-voltage dc power supply, the low-voltage dc power supply charges the fourth capacitor through the fourth diode, and the voltage output by the output terminal is 0;
if the first switching element, the fourth switching element, the sixth switching element, the seventh switching element, and the ninth switching element are turned on and the other switching elements are all turned off, the first capacitor and the second capacitor are respectively connected in series with the low-voltage direct-current power supply, the low-voltage direct-current power supply charges the third capacitor through the third diode, and the voltage output by the output end is 0.
Preferably, the voltage output by the low-voltage direct-current power supply is VdcIf the first switching element and the third switching element are turned on, and the fifth switching element, the eighth switching element, and the tenth switching element are turned on; or the sixth switching element, the seventh switching element and the ninth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is Vdcor-Vdc；
If the second switching element and the fourth switching element are turned on, and the fifth switching element, the eighth switching element and the tenth switching element are turned on; or the sixth switching element, the seventh switching element and the ninth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is Vdcor-Vdc。
Preferably, the voltage output by the low-voltage direct-current power supply is VdcIf the second switching element and the third switching element are turned on, and the fifth switching element, the eighth switching element, and the tenth switching element are turned on; or the sixth switching element, the seventh switching element and the ninth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is 2Vdcor-2Vdc；
If the first switching element and the fourth switching element are turned on, and the fifth switching element, the eighth switching element and the ninth switching element are turned on; or the sixth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is 3Vdcor-3Vdc；
If the second switching element and the third switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or turn on the fifth switching element, the seventh switching element, and the tenth switching element, and the othersThe switch elements are all turned off, and the voltage output by the output end is 4Vdcor-4Vdc。
Preferably, the voltage output by the low-voltage direct-current power supply is VdcIf the first switching element and the third switching element are turned on, and the sixth switching element, the eighth switching element, and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 5Vdcor-5Vdc；
If the second switching element and the fourth switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 5Vdcor-5Vdc。
Preferably, the voltage output by the low-voltage direct-current power supply is VdcIf the first switching element and the fourth switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 6Vdcor-6Vdc。
Preferably, two of said switching elements form a pair of said half-bridge cells which are complementarily conducting.
Preferably, the switching elements in the five half-bridge units are all N-channel MOSFET or P-channel MOSFET or IGBT devices, wherein:
when each of the switching elements is an N-channel MOSFET, a source of the N-channel MOSFET serves as a first end of each of the switching elements, a drain of the N-channel MOSFET serves as a second end of each of the switching elements, and a gate of the N-channel MOSFET serves as a control end of each of the switching elements;
when each switching element is a P-channel MOSFET, the drain of the P-channel MOSFET serves as the first end of each switching element, the source of the P-channel MOSFET serves as the second end of each switching element, and the gate of the P-channel MOSFET serves as the control end of each switching element;
when each switching element is an IGBT device, an emitter of the IGBT device serves as a first end of each switching element, a collector of the IGBT device serves as a second end of each switching element, and a base of the IGBT device serves as a control end of each switching element.
Preferably, the control terminal of each of the switching elements is connected to a controller, and the controller is configured to control on or off of each of the switching elements to achieve output of multilevel alternating current.
According to the technical scheme, the embodiment of the invention has the following advantages: the high-voltage output multi-level inverter circuit outputs the high-voltage alternating current of the voltage output by a low-voltage direct-current power supply to the voltage of the multi-level alternating current through the on or off of the switching elements on the five half-bridge units from the output end, so that the multi-level alternating current output is realized by adopting one power supply input, the circuit structure of the high-voltage output multi-level inverter circuit is simple, and the technical problems that the existing multi-level inverter circuit needs a plurality of input direct-current power supplies and cannot automatically boost voltage are solved.
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, and 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 inventive exercise.
Fig. 1 is a schematic diagram of a high-voltage output multilevel inverter circuit according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a high-voltage output multilevel inverter circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit according to the embodiment of the present invention being 0.
Fig. 4 is a circuit diagram of the output voltage of the output end of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention as the input voltage.
Fig. 5 is a circuit diagram of the output voltage of the output end of the high-voltage output multi-level inverter circuit according to the embodiment of the invention being a negative input voltage.
Fig. 6 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit being twice the input voltage according to the embodiment of the invention.
Fig. 7 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit according to the embodiment of the invention being minus two times the input voltage.
Fig. 8 is a circuit diagram of a multi-level inverter circuit with high voltage output according to an embodiment of the present invention, in which the output voltage of the output terminal is three times the input voltage.
Fig. 9 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit of the embodiment of the invention being minus three times of the input voltage.
Fig. 10 is a circuit diagram of a high-voltage output multi-level inverter circuit according to an embodiment of the present invention, in which the output voltage of the output terminal is four times the input voltage.
Fig. 11 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit being minus four times the input voltage according to the embodiment of the invention.
Fig. 12 is a circuit diagram of a high-voltage output multi-level inverter circuit according to an embodiment of the present invention, in which the output voltage of the output terminal is five times the input voltage.
Fig. 13 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multilevel inverter circuit being minus five times the input voltage according to the embodiment of the present invention.
Fig. 14 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit according to the embodiment of the invention being six times the input voltage.
Fig. 15 is a circuit diagram of the output voltage of the output end of the high-voltage output multilevel inverter circuit according to the embodiment of the present invention being minus six times the input voltage.
Fig. 16 is a switching logic table of the high-voltage output multilevel inverter circuit according to the embodiment of the invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below 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.
The embodiment of the application provides a high-voltage output multi-level inverter circuit, which is used for solving the technical problem that the existing multi-level inverter circuit needs a plurality of input direct-current power supplies and cannot automatically boost.
As shown in fig. 1, fig. 1 is a schematic diagram of a high-voltage output multi-level inverter circuit according to an embodiment of the present invention.
The embodiment of the invention provides a high-voltage output multi-level inverter circuit which comprises a low-voltage direct-current power supply V, at least five half-bridge units, at least four capacitor units and an output end Uo(ii) a The half-bridge unit comprises two switching elements connected in series, and a node connected by the two switching elements is a first series node; each capacitance unit includes a capacitor and a diode connected in series with the capacitor, and a node at which the capacitor is connected to the diode is a second series node. The five half-bridge units are respectively a first half-bridge unit 11, a second half-bridge unit 12, a third half-bridge unit 13, a fourth half-bridge unit 14 and a fifth half-bridge unit 15; the four capacitance units are respectively a first capacitance unit 21, a second capacitance unit 22, a third capacitance unit 23 and a fourth capacitance unit 24.
A first series node of the first half-bridge unit 11 is connected with a first capacitor unit 21, and the first capacitor unit 21 is also connected with the negative electrode of a low-voltage direct-current power supply V; second half-bridgeThe first series node of the unit 12 is connected with a second capacitor unit 22, and the second capacitor unit 22 is also connected with the anode of the low-voltage direct-current power supply V; the first series node of the third half-bridge unit 13 is respectively connected with a third capacitor unit 23 and a fourth capacitor unit 24, the third capacitor unit 23 is further connected with the first capacitor unit 21, and the fourth capacitor unit 24 is further connected with the second capacitor unit 22; output end UoIs connected to the first series node of the fourth half-bridge cell 24, and an output terminal UoIs connected to the first series node of the fifth half-bridge cell 15; a first terminal of the fourth half-bridge cell 14 is connected to the second series node of the fourth capacitive cell 24 and a second terminal of the fourth half-bridge cell 14 is connected to the second series node of the third capacitive cell 23.
The capacitor may be preferably an electrolytic capacitor. The switching element may be an IGBT device or a MOSFET device. Wherein, the output end UoFor connection to a load. The voltage output by the low-voltage DC power supply V is Vdc. Specifically, the switching elements in the five half-bridge units can be N-channel MOSFETs, P-channel MOSFETs or IGBT devices, and when the switching elements are N-channel MOSFETs, the sources of the N-channel MOSFETs are used as the first ends of the switching elements, the drains of the N-channel MOSFETs are used as the second ends of the switching elements, and the gates of the N-channel MOSFETs are used as the control ends of the switching elements; when the switching elements are all P-channel MOSFETs, the drain electrode of each P-channel MOSFET is used as the first end of each switching element, the source electrode of each P-channel MOSFET is used as the second end of each switching element, and the grid electrode of each P-channel MOSFET is used as the control end of each switching element; when the switching elements are all IGBT devices, the emitter of each IGBT device is used as the first end of each switching element, the collector of each IGBT device is used as the second end of each switching element, and the base of each IGBT device is used as the control end of each switching element. The control end of each switching element is connected with the controller, and the controller is used for controlling the on or off of each switching element so as to realize the output of multi-level alternating current.
The high-voltage output multi-level inverter circuit in the embodiment of the invention outputs the high-voltage alternating current which is converted from the voltage output by a low-voltage direct-current power supply to the voltage of the multi-level alternating current through the on or off of the switching elements on the five half-bridge units from the output end, so that the multi-level alternating current output is realized by adopting one power input, the circuit structure of the high-voltage output multi-level inverter circuit is simple, and the technical problems that the existing multi-level inverter circuit needs a plurality of input direct-current power supplies and cannot automatically boost voltage are solved.
It should be noted that the voltage of the multilevel alternating current means that the output voltage not only has a polarity that can be changed between positive and negative, but also can be gradually increased and then decreased level by level in a step form, so that the output voltage waveform approaches to a sine waveform.
As shown in fig. 2, fig. 2 is a circuit diagram of a high-voltage output multi-level inverter circuit according to an embodiment of the present invention.
In the high-voltage output multilevel inverter circuit provided by the embodiment of the present invention, the first half bridge unit 11 includes a first switching element S1 and a second switching element S2; the second half-bridge cell 12 includes a third switching element S3 and a fourth switching element S4; the third half-bridge cell 13 includes a fifth switching element S5 and a sixth switching element S6; the fourth half-bridge cell 14 includes a seventh switching element S7 and an eighth switching element S8; the fifth half-bridge unit 15 includes a ninth switching element S9 and a tenth switching element S10. The first capacitance unit 21 includes a first capacitor C1 and a first diode D1; the second capacitance unit 22 includes a second capacitor C2 and a second diode D2; the third capacitance unit 23 includes a third capacitor C3 and a third diode D3; the fourth capacitance unit 24 includes a fourth capacitor C4 and a fourth diode D4.
A first terminal of the first switching element S1, a first terminal of the third switching element S3, and a cathode of the first diode D1 are connected to a negative electrode of the low-voltage dc power source V, respectively; a second terminal of the second switching element S2, a second terminal of the fourth switching element S4, and an anode of the second diode D2 are connected to an anode of the low-voltage dc power supply V, respectively; a second terminal of the first switching element S1 and a first terminal of the second switching element S2 are connected to a second terminal of the first capacitor C1, respectively; a second terminal of the third switching element S3 and a first terminal of the fourth switching element S4 are connected to a first terminal of the second capacitor C2, respectively; first terminal of first capacitor C1, first diode DAn anode of 1, a first terminal of the fifth switching element S5, and a cathode of the third diode D3 are connected to a first terminal of the ninth switching element S9, respectively; a second terminal of the second capacitor C2, a cathode of the second diode D2, a second terminal of the sixth switching element S6, and an anode of the fourth diode D4 are connected to a second terminal of the tenth switching element D10, respectively; a second terminal of the fifth switching element S5 and a first terminal of the sixth switching element S6 are connected to a second terminal of the third capacitor C3 and a first terminal of the fourth capacitor C4, respectively; a second terminal of the third capacitor C3 and an anode of the third diode D3 are connected to a first terminal of the seventh switching element S7, respectively; a second terminal of the fourth capacitor C4 and a cathode of the fourth diode D4 are connected to a second terminal of the eighth switching element S8, respectively; the second terminal of the seventh switching element S7 and the first terminal of the eighth switching element S8 are connected to the output terminal U, respectivelyoIs connected to the first terminal of the ninth switching element S9 and the first terminal of the tenth switching element S10 are connected to the output terminal U, respectivelyoIs connected to the second end of the first housing.
The first switching element S1 and the second switching element S2 form a pair of complementary conducting half-bridge units, the third switching element S3 and the fourth switching element S4 form a pair of complementary conducting half-bridge units, the fifth switching element S5 and the sixth switching element S6 form a pair of complementary conducting half-bridge units, the seventh switching element S7 and the eighth switching element S8 form a pair of complementary conducting half-bridge units, and the eighth switching element S9 and the tenth switching element S10 form a pair of complementary conducting half-bridge units. The first capacitor C1 and the second capacitor C2 have the same capacitance and are rated at a voltage equal to the voltage V of the low-voltage DC power supplydcThe third capacitor C3 has the same capacitance as the fourth capacitor C4 and has a voltage rating equal to the low-voltage DC power supply voltage VdcThree times that of the third capacitor C3 and the fourth capacitor C4, namely, the rated voltage value is 3Vdc. In the high-voltage output multi-level inverter circuit, any one of the switching elements is conducted on the first half-bridge unit 11, the second half-bridge unit 12, the third half-bridge unit 13, the fourth half-bridge unit 14 and the fifth half-bridge unit 15, so that the output end U is connected with the output end UoThe multi-level inverter circuit of the high-voltage output outputs alternating voltageWhen multi-level alternating current is generated, any one of the switching elements is conducted on the first half-bridge unit 11, the second half-bridge unit 12, the third half-bridge unit 13, the fourth half-bridge unit 14 and the fifth half-bridge unit 15 which are sequentially switched among various different states in the whole circuit, so that the voltage V of a low-voltage direct current power supply is realizeddcConverted to contain 0, ± Vdc、±2Vdc、±3Vdc、±4Vdc、±5VdcAnd. + -. 6Vdc13 high-voltage alternating currents with different levels are arranged at an output end UoAnd (6) outputting.
As shown in fig. 3, fig. 3 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multilevel inverter circuit according to the embodiment of the present invention being 0.
In an embodiment of the present invention, the first switch element S1, the fourth switch element S4, the fifth switch element S5, the eighth switch element S8, and the tenth switch element S10 are turned on, all the other switch elements are turned off, the first capacitor C1 and the second capacitor C2 are respectively connected in series with the low-voltage dc power supply V, the low-voltage dc power supply V charges the fourth capacitor C4 through the fourth diode D2, and the output terminal U is connected to the output terminal UoThe output voltage is 0. The first switching element S1, the fourth switching element S4, the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on, all other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are respectively connected with the low-voltage direct-current power supply V in series, the low-voltage direct-current power supply V charges the third capacitor C3 through the third diode D3, and the output end U is connected with the output end UoThe output voltage is 0.
It should be noted that, the first switching element S1, the fourth switching element S4, the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on, all the other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are respectively connected in series with the low-voltage dc power supply V, the low-voltage dc power supply V charges the fourth capacitor C4 through the fourth diode D4, and at the same time, since the fourth diode D4, the eighth switching element S8 and the tenth switching element S10 are turned on, the output terminal U is connected to the output terminal UoThe output voltage is 0. Turn on the first switching element S1, the fourth switching element S4, the sixth switching element S6, the seventh switching element S7, the ninth switching element S9, and othersThe first capacitor C1 and the second capacitor C2 are respectively connected in series with the low voltage dc power source V which charges the third capacitor C3 through the third diode D3, and at the same time, the output terminal U is turned on because the third diode D3, the seventh switching element S7 and the ninth switching element S9 are turned onoThe output voltage is 0.
As shown in fig. 4 and 5, fig. 4 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention as the input voltage, and fig. 5 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention as the negative input voltage.
In one embodiment of the present invention, the low voltage DC power supply V outputs a voltage VdcIf the first switching element S1 and the third switching element S3 are turned on, and the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on; or the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on, all other switching elements are turned off, and the output terminal U is connected to the groundoThe output voltage is Vdcor-Vdc；
If the second switching element S2 and the fourth switching element S4 are turned on, and the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on; or the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on, all other switching elements are turned off, and the output terminal U is connected to the output terminal UoThe output voltage is Vdcor-Vdc。
It should be noted that the low voltage dc power supply V outputs a voltage VdcAs shown in fig. 4, when the first switching element S1, the third switching element S3, the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low voltage dc power supply V charges the second capacitor C2 through the second diode D2, the first capacitor C1 and the second capacitor C2 are connected in series through the first switching element S1 and the third switching element S3, then connected in series through the fifth switching element S5 and the fourth capacitor C4 in reverse direction, and connected from the output terminal U4 through the eighth switching element S8 and the tenth switching element S10oThe output voltage/level is + Vdc(ii) a When the second switching element S2, the fourth switching element S4, the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 through the first diode D1, the first capacitor C1 and the second capacitor C2 are connected in series through the second switching element S2 and the fourth switching element S4, then connected in series through the fifth switching element S5 and the fourth capacitor C4 in reverse direction, and connected from the output terminal U4 through the eighth switching element S8 and the tenth switching element S10oThe output voltage/level is + Vdc. As shown in fig. 5, when the first switching element S1, the third switching element S3, the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on and all other switching elements are turned off, the low voltage dc power source V charges the second capacitor C2 through the second diode D2, the first capacitor C1 and the second capacitor C2 are connected in series through the first switching element S1 and the third switching element S3, then connected in series through the sixth switching element S6 and the third capacitor C3 in reverse direction, and connected from the output terminal U3 through the seventh switching element S7 and the ninth switching element S9oThe output voltage/level is-Vdc(ii) a When the second switching element S2, the fourth switching element S4, the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 through the first diode D1, the first capacitor C1 and the second capacitor C2 are connected in series through the second switching element S2 and the fourth switching element S4, then connected in series through the sixth switching element S6 and the third capacitor C3 in reverse direction, and connected in series through the seventh switching element S7 and the ninth switching element S9 from the output terminal U3oThe output voltage/level is-Vdc。
As shown in fig. 6 and 7, fig. 6 is a circuit diagram illustrating that the output voltage of the output terminal of the high-voltage output multi-level inverter circuit is twice the input voltage according to the embodiment of the present invention, and fig. 7 is a circuit diagram illustrating that the output voltage of the output terminal of the high-voltage output multi-level inverter circuit is minus twice the input voltage according to the embodiment of the present invention.
In one embodiment of the present invention, the voltage outputted by the low voltage DC power supply VIs a VdcIf the second switching element S2 and the third switching element S3 are turned on, and the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on; or the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on, all other switching elements are turned off, and the output terminal U is connected to the groundoThe output voltage/level is 2Vdcor-2Vdc。
It should be noted that the low voltage dc power supply V outputs a voltage VdcAs shown in fig. 6, when the second switching element S2, the third switching element S3, the fifth switching element S5, the eighth switching element S8 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low-voltage dc power source V charges the first capacitor C1 and the second capacitor C2 through the first diode D1 and the second diode D2, respectively, is connected in series with the fourth capacitor C4 in reverse through the fifth switching element S5, and is also connected from the output terminal U through the eighth switching element S8 and the tenth switching element S10oThe output voltage/level is 2Vdc. As shown in fig. 7, when the second switching element S2, the third switching element S3, the sixth switching element S6, the seventh switching element S7 and the ninth switching element S9 are turned on and all other switching elements are turned off, the low-voltage dc power source V charges the first capacitor C1 and the second capacitor C2 through the first diode D1 and the second diode D2, respectively, and is connected in series with the third capacitor C3 in reverse through the sixth switching element S5 and also from the output terminal U through the seventh switching element S7 and the ninth switching element S9oThe output voltage/level is-2Vdc。
As shown in fig. 8 and 9, fig. 8 is a circuit diagram illustrating that the output voltage of the output end of the high-voltage output multi-level inverter circuit is three times the input voltage, and fig. 9 is a circuit diagram illustrating that the output voltage of the output end of the high-voltage output multi-level inverter circuit is minus three times the input voltage.
In an embodiment of the present invention, if the first switching element S1 and the fourth switching element S4 are turned on, and the fifth switching element S5, the eighth switching element S8 and the ninth switching element S9 are turned on; or and turn on the sixth switching element S6, the seventh switching element S7 and the tenth switching element S7Switching element S10, all other switching elements are turned off, and output terminal UoThe output voltage/level is 3Vdcor-3Vdc。
It should be noted that the low voltage dc power supply V outputs a voltage VdcAs shown in fig. 8, when the first switching element S1, the fourth switching element S4, the fifth switching element S5, the eighth switching element S8 and the ninth switching element S9 are turned on and all other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are respectively connected in series with the low-voltage dc power supply V and then charge the fourth capacitor C4 through the fourth diode D4, and the fourth capacitor C4 is charged from the output terminal U through the fifth switching element S5, the eighth switching element S8 and the ninth switching element S9oThe output voltage/level is 3Vdc. As shown in fig. 9, when the first switching element S1, the fourth switching element S4, the sixth switching element S6, the seventh switching element S7 and the tenth switching element S10 are turned on and all other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are respectively connected in series with the low-voltage dc power supply V and then charge the third capacitor C3 through the third diode D3, and the third capacitor C3 is charged from the output terminal U through the sixth switching element S6, the seventh switching element S7 and the tenth switching element S10oThe output voltage/level is-3Vdc。
As shown in fig. 10 and 11, fig. 10 is a circuit diagram of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention in which the output voltage of the output terminal is four times the input voltage, and fig. 11 is a circuit diagram of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention in which the output voltage of the output terminal is minus four times the input voltage.
In an embodiment of the present invention, if the second switching element S2 and the third switching element S3 are turned on, and the sixth switching element S6, the eighth switching element S8 and the ninth switching element S9 are turned on; or the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on, all the other switching elements are turned off, and the voltage/level of the output terminal vout is 4Vdcor-4Vdc。
It should be noted that the low voltage dc power supply V outputs a voltage VdcIf it is on, as shown in FIG. 10The second switching element S2, the third switching element S3, the sixth switching element S6, the eighth switching element S8, the ninth switching element S9 and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 and the second capacitor C2 through the first diode D1 and the second diode D2, respectively, and is connected in series with the fourth capacitor C4 through the sixth switching element S6 and then is connected from the output terminal U through the eighth switching element S8 and the ninth switching element S9oThe output voltage/level is 4Vdc. As shown in fig. 11, when the second switching element S2, the third switching element S3, the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 and the second capacitor C2 through the first diode D1 and the second diode D2, respectively, and is connected in series with the third capacitor C3 through the fifth switching element S5 and then passes through the seventh switching element S7 and the tenth switching element S10 from the output terminal UoThe output voltage/level is-4Vdc。
As shown in fig. 12 and 13, fig. 12 is a circuit diagram of five times the output voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention, and fig. 13 is a circuit diagram of minus five times the input voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention.
In one embodiment of the present invention, the low voltage DC power supply outputs a voltage VdcIf the first switching element S1 and the third switching element S3 are turned on, and the sixth switching element S6, the eighth switching element S8 and the ninth switching element S9 are turned on; or the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on, all other switching elements are turned off, and the output terminal U is connected to the power supplyoThe output voltage is 5Vdcor-5Vdc(ii) a If the second switching element S2 and the fourth switching element S4 are turned on, and the sixth switching element S6, the eighth switching element S8 and the ninth switching element S9 are turned on; or the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on, all other switching elements are turned off, and the output terminal U is connected to the power supplyoThe output voltage is 5Vdcor-5Vdc。
As shown in fig. 12, when the first switching element S1, the third switching element S3, the sixth switching element S6, the eighth switching element S8, and the ninth switching element S9 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the second capacitor C2 through the second diode D2, the first capacitor C1 and the second capacitor C2 are connected in series through the first switching element S1 and the third switching element S3, and then connected in series through the sixth switching element S6 and the fourth capacitor C4, and then connected in series through the eighth switching element S8 and the ninth switching element S9 from the output terminal U3583oThe output voltage is 5Vdc(ii) a When the second switching element S2, the fourth switching element S4, the sixth switching element S6, the eighth switching element S8 and the ninth switching element S9 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 through the first diode D1, the first capacitor C1 and the second capacitor C2 are connected in series through the second switching element S2 and the fourth switching element S4, and then connected in series through the sixth switching element S6 and the fourth capacitor C4, and then connected in series through the eighth switching element S8 and the ninth switching element S9 from the output terminal U4oThe output voltage is 5Vdc. As shown in fig. 13, when the first switching element S1, the third switching element S3, the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the second capacitor C2 through the second diode D2, the first capacitor C1 and the second capacitor C2 are connected in series through the first switching element S1 and the third switching element S3, and then connected in series through the fifth switching element S5 and the third capacitor C3, and then connected in series through the seventh switching element S7 and the tenth switching element S10 from the output terminal U3oThe output voltage is-5Vdc(ii) a When the second switching element S2, the fourth switching element S4, the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on and all other switching elements are turned off, the low-voltage dc power supply V charges the first capacitor C1 through the first diode D1, the first capacitor C1 and the second capacitor C2 are connected in series through the second switching element S2 and the fourth switching element S4, and then connected in series through the fifth switching element S5 and the third capacitor C3, and then connected in series through the seventh switching element S7 and the tenth switching element S7From the output U, piece S10oThe output voltage is-5Vdc。
As shown in fig. 14 and 15, fig. 14 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention being six times the input voltage, and fig. 15 is a circuit diagram of the output voltage of the output terminal of the high-voltage output multi-level inverter circuit according to the embodiment of the present invention being minus six times the input voltage.
In one embodiment of the present invention, the low voltage DC power supply outputs a voltage VdcIf the first switching element S1 and the fourth switching element S4 are turned on, and the sixth switching element S6, the eighth switching element S8 and the ninth switching element S9 are turned on; or the fifth switching element S5, the seventh switching element S7 and the tenth switching element S10 are turned on, all other switching elements are turned off, and the output terminal U is connected to the power supplyoThe output voltage is 6Vdcor-6Vdc。
As shown in fig. 14, when the first switching element S1, the fourth switching element S4, the sixth switching element S6, the eighth switching element S8, and the ninth switching element S9 are turned on and all other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are connected in series to the low-voltage dc power supply V, respectively, and then the third capacitor C3 is charged through the third diode D3, and the third capacitor C3 is connected in series to the fourth capacitor C4, and then the eighth switching element S8 and the ninth switching element S9 are connected from the output terminal UoThe output voltage is 6Vdc. As shown in fig. 15, when the first switching element S1, the fourth switching element S4, the fifth switching element S5, the seventh switching element S7, and the tenth switching element S10 are turned on and all other switching elements are turned off, the first capacitor C1 and the second capacitor C2 are connected in series to the low-voltage dc power supply V, respectively, and then the fourth capacitor C4 is charged through the fourth diode D4, and the third capacitor C3 is connected in series to the fourth capacitor C4, and then the output terminal U is connected from the seventh switching element S7 and the tenth switching element S10 through the seventh switching element S7 and the tenth switching element S10oThe output voltage is-6Vdc。
The high-voltage output multi-level inverter circuit can control the reasonable on and off of the first to tenth switching elements to convert the voltage V of a low-voltage DC power supply V intodcIs converted into a compound containing0、±Vdc、±2Vdc、±3Vdc、±4Vdc、±5Vdcc and. + -. 6VdcAnd 13, outputting high-voltage alternating currents with different levels. As shown in the table 1 below, the following examples,
TABLE 1 switching logic table of high-voltage output multi-level inverter circuit
Figure GDA0003017877930000161
Referring to table 1, the output voltage of the high voltage output multi-level inverter circuit may be from-6Vdc、-5VdcGradually increased to +6VdcThen gradually reduced to-6VdcAnd the output of multilevel AC is realized by increasing and decreasing back and forth, so that the output voltage of the low-voltage DC power supply is VdcThe amplitude of the alternating current output by the high-voltage output multi-level inverter circuit is 6VdcAnd the output of multilevel alternating current is realized.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and 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 units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (8)

1. A multi-level inverter circuit with high voltage output is characterized by comprising a low-voltage direct current power supply, at least five half-bridge units, at least four capacitor units and an output end;
the half-bridge unit comprises two switching elements connected in series, and a node connected by the two switching elements is a first series node;
each capacitance unit comprises a capacitor and a diode connected with the capacitor in series, and the node of the capacitor connected with the diode is a second series node;
the five half-bridge units are respectively a first half-bridge unit, a second half-bridge unit, a third half-bridge unit, a fourth half-bridge unit and a fifth half-bridge unit; the four capacitor units are respectively a first capacitor unit, a second capacitor unit, a third capacitor unit and a fourth capacitor unit;
the first series node of the first half-bridge unit is connected with the first capacitor unit, and the first capacitor unit is also connected with the negative electrode of the low-voltage direct-current power supply;
the first series node of the second half-bridge unit is connected with the second capacitor unit, and the second capacitor unit is also connected with the anode of the low-voltage direct-current power supply;
the first series node of the third half-bridge unit is respectively connected with the third capacitor unit and the fourth capacitor unit, the third capacitor unit is further connected with the first capacitor unit, and the fourth capacitor unit is further connected with the second capacitor unit;
a first end of the output terminal is connected to the first series node of the fourth half-bridge cell, and a second end of the output terminal is connected to the first series node of the fifth half-bridge cell;
a first end of the fourth half-bridge cell is connected to the second series node of the fourth capacitive cell, and a second end of the fourth half-bridge cell is connected to the second series node of the third capacitive cell;
the first half-bridge unit includes a first switching element and a second switching element; the second half-bridge unit includes a third switching element and a fourth switching element; the third half-bridge cell includes a fifth switching element and a sixth switching element; the fourth half-bridge cell includes a seventh switching element and an eighth switching element; the fifth half-bridge cell includes a ninth switching element and a tenth switching element;
the first capacitance unit includes a first capacitor and a first diode; the second capacitance unit includes a second capacitor and a second diode; the third capacitance unit includes a third capacitor and a third diode; the fourth capacitance unit includes a fourth capacitor and a fourth diode; wherein the content of the first and second substances,
the first end of the first switching element, the first end of the third switching element and the cathode of the first diode are respectively connected with the negative electrode of the low-voltage direct-current power supply;
a second end of the second switching element, a second end of the fourth switching element and an anode of the second diode are respectively connected with a positive electrode of the low-voltage direct-current power supply;
a second terminal of the first switching element and a first terminal of the second switching element are connected to a second terminal of the first capacitor, respectively;
a second terminal of the third switching element and a first terminal of the fourth switching element are connected to a first terminal of the second capacitor, respectively;
a first end of the first capacitor, an anode of the first diode, a first end of the fifth switching element, and a cathode of the third diode are connected to a first end of the ninth switching element, respectively;
a second terminal of the second capacitor, a cathode of the second diode, a second terminal of the sixth switching element, and an anode of the fourth diode are connected to the second terminal of the tenth switching element, respectively;
a second terminal of the fifth switching element and a first terminal of the sixth switching element are connected to a second terminal of the third capacitor and a first terminal of the fourth capacitor, respectively;
a second terminal of the third capacitor and an anode of the third diode are respectively connected with a first terminal of the seventh switching element;
a second terminal of the fourth capacitor and a cathode of the fourth diode are respectively connected with a second terminal of the eighth switching element;
a second terminal of the seventh switching element and a first terminal of the eighth switching element are respectively connected to the first terminal of the output terminal, and a second terminal of the ninth switching element and a first terminal of the tenth switching element are respectively connected to the second terminal of the output terminal
If the first switching element, the fourth switching element, the fifth switching element, the eighth switching element and the tenth switching element are turned on and all other switching elements are turned off, the first capacitor and the second capacitor are respectively connected in series with the low-voltage direct-current power supply, the low-voltage direct-current power supply charges the fourth capacitor through the fourth diode, and the voltage output by the output end is 0;
if the first switching element, the fourth switching element, the sixth switching element, the seventh switching element, and the ninth switching element are turned on and the other switching elements are all turned off, the first capacitor and the second capacitor are respectively connected in series with the low-voltage direct-current power supply, the low-voltage direct-current power supply charges the third capacitor through the third diode, and the voltage output by the output end is 0.
2. The high-voltage-output multi-level inverter circuit according to claim 1, wherein the low-voltage DC power supply outputs a voltage VdcIf the first switching element and the third switching element are turned on, and the fifth switching element, the eighth switching element, and the tenth switching element are turned on; or the sixth switching element, the seventh switching element and the ninth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is Vdcor-Vdc；
If the second switching element and the fourth switching element are turned on, and the fifth switching element, the eighth switching element and the tenth switching element are turned on; or and turning on the sixth switching element,The seventh switching element and the ninth switching element, and the other switching elements are all turned off, and the voltage output from the output terminal is Vdcor-Vdc。
3. The high-voltage-output multi-level inverter circuit according to claim 1, wherein the low-voltage DC power supply outputs a voltage VdcIf the second switching element and the third switching element are turned on, and the fifth switching element, the eighth switching element, and the tenth switching element are turned on; or the sixth switching element, the seventh switching element and the ninth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is 2Vdcor-2Vdc；
If the first switching element and the fourth switching element are turned on, and the fifth switching element, the eighth switching element and the ninth switching element are turned on; or the sixth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output end is 3Vdcor-3Vdc；
If the second switching element and the third switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 4Vdcor-4Vdc。
4. The high-voltage-output multi-level inverter circuit according to claim 1, wherein the low-voltage DC power supply outputs a voltage VdcIf the first switching element and the third switching element are turned on, and the sixth switching element, the eighth switching element, and the ninth switching element are turned on; or and turns on the fifth switching element, the seventh switching element and the tenth switching elementAll other switch elements are turned off, and the voltage output by the output end is 5Vdcor-5Vdc；
If the second switching element and the fourth switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 5Vdcor-5Vdc。
5. The high-voltage-output multi-level inverter circuit according to claim 1, wherein the low-voltage DC power supply outputs a voltage VdcIf the first switching element and the fourth switching element are turned on, and the sixth switching element, the eighth switching element and the ninth switching element are turned on; or the fifth switching element, the seventh switching element and the tenth switching element are turned on, all the other switching elements are turned off, and the voltage output by the output terminal is 6Vdcor-6Vdc。
6. The high-voltage-output multilevel inverter circuit according to claim 1, wherein the two switching elements form a pair of complementary conducting half-bridge cells.
7. The high-voltage-output multi-level inverter circuit according to claim 1, wherein the switching elements in the five half-bridge units are all N-channel MOSFET or P-channel MOSFET or IGBT devices, and wherein:
when the switch elements are all N-channel MOSFETs, the source electrode of each N-channel MOSFET is used as the first end of each switch element, the drain electrode of each N-channel MOSFET is used as the second end of each switch element, and the grid electrode of each N-channel MOSFET is used as the control end of each switch element;
when the switching elements are all P-channel MOSFETs, the drain of each P-channel MOSFET is used as the first end of the switching element, the source of each P-channel MOSFET is used as the second end of the switching element, and the gate of each P-channel MOSFET is used as the control end of the switching element;
when the switching elements are all IGBT devices, the emitter of each IGBT device is used as the first end of each switching element, the collector of each IGBT device is used as the second end of each switching element, and the base of each IGBT device is used as the control end of each switching element.
8. The high-voltage-output multi-level inverter circuit according to claim 7, wherein the control terminal of each of the switching elements is connected to a controller, and the controller is configured to control the switching elements to be turned on or off to output a multi-level alternating current.
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