CN110768556B - Multi-level inverter circuit based on buck-boost and inverter system - Google Patents
Multi-level inverter circuit based on buck-boost and inverter system Download PDFInfo
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- CN110768556B CN110768556B CN201911194927.2A CN201911194927A CN110768556B CN 110768556 B CN110768556 B CN 110768556B CN 201911194927 A CN201911194927 A CN 201911194927A CN 110768556 B CN110768556 B CN 110768556B
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
Abstract
The embodiment of the invention relates to a multi-level inverter circuit and an inverter system based on voltage boosting and reducing, which comprise a direct-current power supply, a voltage-reducing inverter unit, a voltage-boosting inverter unit, an alternating-current output end and a controller, wherein the voltage-reducing inverter unit and the voltage-boosting inverter unit are respectively connected with the direct-current power supply in parallel, the voltage-reducing inverter unit and the voltage-boosting inverter unit respectively comprise a plurality of fully-controlled switch elements, and the control ends of all the fully-controlled switch elements are also connected with the controller. This many level inverter circuit based on step-up and step-down converts the voltage of a DC power supply output to many levels alternating current from the output of interchange through switching on or cutting off of each full-controlled switch element on step-down contravariant unit and the step-up contravariant unit for adopt a power input to realize many levels alternating current's output, and this many level inverter circuit based on step-up and step-down's circuit simple structure.
Description
Technical Field
The invention relates to the technical field of power electronic inverter circuits, in particular to a multi-level inverter circuit based on voltage boosting and reducing and an inverter system.
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 multi-level inverter circuit based on voltage boosting and reducing and an inverter system, which are used for solving the technical problems that a plurality of input direct-current power supplies are required and the voltage boosting and reducing cannot be automatically carried out 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 based on voltage boosting and reducing comprises a direct-current power supply, a voltage-reducing inverter unit, a voltage-boosting inverter unit, an alternating-current output end and a controller;
the direct current power supply is used for providing direct current power supply;
the voltage reduction inversion unit is connected with the direct current power supply in parallel, and the voltage reduction output end of the voltage reduction inversion unit is connected with the first end of the alternating current output end;
the boosting inversion unit is connected with the direct-current power supply in parallel, and the boosting output end of the boosting inversion unit is connected with the second end of the alternating-current output end;
the voltage reduction inversion unit and the voltage boosting inversion unit respectively comprise a plurality of full-control switch elements, the control ends of the full-control switch elements are connected with the controller, the controller controls the voltage reduction inversion unit and the voltage boosting inversion unit to be switched on or switched off, and therefore the alternating current output end outputs multi-level alternating current.
Preferably, the step-down inverter unit includes a first fully-controlled switching element, a second fully-controlled switching element, a first capacitor, and a second capacitor;
a first end of the first full-control switching element is connected with a first end of the first capacitor and serves as a first connection end of the voltage reduction inversion unit, a second end of the second full-control switching element is connected with a second end of the second capacitor and serves as a second connection end of the voltage reduction inversion unit, a second end of the first full-control switching element is respectively connected with a first end of the second full-control switching element and a first end of the first switching element and serves as a voltage reduction output end of the voltage reduction inversion unit, and a second end of the first capacitor is respectively connected with a first end of the second capacitor and a second end of the first switching element;
the first connecting end of the voltage reduction inversion unit is connected with the negative electrode of the direct current power supply, and the second connecting end of the voltage reduction inversion unit is connected with the positive electrode of the direct current power supply.
Preferably, the first switch element is a bidirectional full-control switch. The bidirectional full-control switch comprises two IGBT devices which are connected in series in an opposite direction or two MOSFETs which are connected in series in an opposite direction.
Preferably, the first switching element comprises a third fully controlled switching element, a fourth fully controlled switching element, a first diode and a second diode;
a first end of the third fully-controlled switching element is respectively connected with an anode of the first diode and a second end of the first fully-controlled switching element, and a cathode of the first diode and an anode of the second diode are connected and serve as second ends of the first switching element;
and the cathode of the second diode is respectively connected with the first end of the second full-control switching element and the second end of the fourth full-control switching element, and the first end of the fourth full-control switching element is connected with the second end of the third full-control switching element and serves as the voltage reduction output end of the voltage reduction inversion unit.
Preferably, the first switch element comprises a third fully-controlled switch element, a fourth fully-controlled switch element, a fifth fully-controlled switch element, a sixth fully-controlled switch element and a third capacitor;
a first end of the third fully-controlled switching element is connected with a first end of the fifth fully-controlled switching element, a second end of the first fully-controlled switching element and a first end of the third capacitor, respectively, and a second end of the fifth fully-controlled switching element is connected with a first end of the sixth fully-controlled switching element and serves as a second end of the first switching element;
and a second end of the sixth fully-controlled switching element is respectively connected with a first end of the second fully-controlled switching element, a second end of the third capacitor and a second end of the fourth fully-controlled switching element, and a first end of the fourth fully-controlled switching element is connected with a second end of the third fully-controlled switching element and serves as a step-down output end of the step-down inverter unit.
Preferably, the boost inverting unit includes a seventh fully-controlled switching element, an eighth fully-controlled switching element, a ninth switching element, a tenth switching element, an eleventh fully-controlled switching element, a twelfth fully-controlled switching element, a fourth capacitor, and a fifth capacitor；
A first end of the seventh fully-controlled switching element is connected to a second end of the tenth switching element and serves as a first end of the boost inverting unit, a first end of the tenth switching element is respectively connected to a first end of the fourth capacitor and a first end of the eleventh fully-controlled switching element, a second end of the eleventh fully-controlled switching element is connected to a first end of the twelfth fully-controlled switching element and serves as a boost output end of the boost inverting unit, a second end of the twelfth fully-controlled switching element is respectively connected to a first end of the fifth capacitor and a second end of the ninth switching element, a first end of the ninth switching element is connected to a second end of the eighth fully-controlled switching element and serves as a second end of the boost inverting unit, and a first end of the eighth fully-controlled switching element is connected to a second end of the seventh fully-controlled switching element and then is respectively connected to a second end of the fourth capacitor and a first end of the fifth capacitor End connection;
the first end of the boosting inversion unit is connected with the negative electrode of the direct current power supply, and the second end of the boosting inversion unit is connected with the positive electrode of the direct current power supply.
Preferably, the ninth switching element and the tenth switching element are fully-controlled switching elements or diodes. Wherein an anode of the diode serves as a first terminal of the switching element, and a cathode of the diode serves as a second terminal of the switching element.
Preferably, each fully-controlled switching element in the buck inverter unit and the boost inverter unit is an N-channel MOSFET or a P-channel MOSFET or an IGBT device, wherein:
when each full-control switch element is an N-channel MOSFET, the source electrode of the N-channel MOSFET is used as the first end of the full-control switch element, the drain electrode of the N-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the N-channel MOSFET is used as the control end of the full-control switch element;
when each full-control switch element is a P-channel MOSFET, the drain electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the P-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element;
when each of the fully-controlled switch elements is an IGBT device, an emitter of the IGBT device is used as a first end of the fully-controlled switch element, a collector of the IGBT device is used as a second end of the fully-controlled switch element, and a base of the IGBT device is used as a control end of the fully-controlled switch element.
An inverter system comprises the buck-boost-based multi-level inverter circuit and a controller for controlling the on or off of each fully-controlled switch element in the buck-boost-based multi-level inverter circuit, wherein the controller controls the on or off of each fully-controlled switch element in the buck-boost-based multi-level inverter circuit to realize the output of multi-level alternating current.
According to the technical scheme, the embodiment of the invention has the following advantages: this many level inverter circuit based on step-up and step-down converts the voltage of a DC power supply output to many levels alternating current from the output of interchange through switching on or cutting off of each full-controlled switch element on step-down inverter unit and the inverter unit that steps up for adopt a power input to realize many levels alternating current's output, and this many level inverter circuit based on step-up and step-down's circuit simple structure has solved the technical problem that needs a plurality of input DC power supplies and can not automatic step-up and step-down of current many level inverter circuit.
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 frame of a buck-boost-based multi-level inverter circuit according to an embodiment of the present invention.
Fig. 2a is a circuit diagram of a buck-boost-based multi-level inverter circuit buck inverter unit according to a first embodiment of the present invention.
Fig. 2b is a circuit diagram of a buck-boost-based multi-level inverter circuit buck inverter unit according to a second embodiment of the present invention.
Fig. 2c is a circuit diagram of a third embodiment of a buck-boost-based multi-level inverter circuit buck inverter unit according to the embodiment of the invention.
Fig. 3 is a circuit diagram of a bidirectional full-control switch of a buck-boost-based multi-level inverter circuit according to an embodiment of the invention.
Fig. 4a is a circuit diagram of a first embodiment of a boost-buck-based multi-level inverter circuit boost inverter unit according to an embodiment of the present invention.
Fig. 4b is a circuit diagram of a second embodiment of a boost-buck-based multi-level inverter circuit boost inverter unit according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a buck-boost based multi-level inverter circuit according to an embodiment of the invention.
Fig. 6 is a switching logic diagram of a buck-boost based multi-level inverter circuit according to an 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 multi-level inverter circuit based on voltage boosting and reducing and an inverter system, which are used for solving the technical problems that the existing multi-level inverter circuit needs a plurality of input direct-current power supplies and can not automatically boost and reduce the voltage.
The first embodiment is as follows:
fig. 1 is a schematic diagram of a frame of a buck-boost-based multi-level inverter circuit according to an embodiment of the present invention.
The embodiment of the invention provides a multi-level inverter circuit based on voltage boosting and reducing, which comprises a direct-current power supply 10, a voltage-reducing inverter unit 20, a voltage-boosting inverter unit 30 and an alternating-current output end UoAnd a controller 40; the direct current power supply is used for providing direct current power supply; the voltage-reducing inverter unit 20 is connected in parallel with the DC power supply 10, and the voltage-reducing output terminal 21 and the AC output terminal U of the voltage-reducing inverter unit 10oIs connected with the first end of the first connecting pipe; the boosting inversion unit 30 is connected in parallel with the dc power supply 10, and the boosting output terminal 31 and the ac output terminal U of the boosting inversion unit 30oIs connected with the second end of the first end; the buck inverter unit 20 and the boost inverter unit 30 both include a plurality of fully-controlled switching elements, the control end of each fully-controlled switching element is also connected with the controller 40, and the controller 40 controls the on/off of each fully-controlled switching element in the buck inverter unit 20 and the boost inverter unit 30 to realize the ac output end UoAnd outputting multilevel alternating current.
It should be noted that the fully-controlled switching element may be an IGBT device, an N-channel or P-channel MOSFET device, or other types of switchesThe switch-off is only required to conform to the principle of a fully-controlled switch, and the application is not particularly limited herein. Wherein, the AC output end UoFor connection to a load. The voltage output by the DC power supply 10 is Vdc. Specifically, each full-control switching element in the buck inverter unit 20 and the boost inverter unit 30 may select an N-channel MOSFET, a P-channel MOSFET, or an IGBT device, when each full-control switching element selects an N-channel MOSFET, the source of the N-channel MOSFET serves as the first end of the full-control switching element, the drain of the N-channel MOSFET serves as the second end of the full-control switching element, and the gate of the N-channel MOSFET serves as the control end of the full-control switching element. When each full-control switch element adopts a P-channel MOSFET, the drain electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the P-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element. When each full-control switch element is an IGBT device, an emitter of the IGBT device is used as a first end of the full-control switch element, a collector of the IGBT device is used as a second end of the switch element, and a base of the IGBT device is used as a control end of the full-control switch element. The control end of each fully-controlled switching element is connected with the controller 40, and the controller 40 is used for controlling the on/off of each fully-controlled switching element so as to output multi-level alternating current.
The multi-level inverter circuit based on the boost-buck converter converts the voltage output by one direct-current power supply into multi-level alternating current through the on-off of all full-control switch elements on the buck inverter unit and the boost inverter unit and outputs the multi-level alternating current from the alternating-current output end, so that the multi-level alternating current output is realized by adopting one power input, the circuit structure of the multi-level inverter circuit based on the boost-buck converter 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 and buck 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. 2a to 2c, fig. 2a is a circuit diagram of a first embodiment of a buck-boost-based multi-level inverter circuit buck-inverter unit according to an embodiment of the present invention; fig. 2b is a circuit diagram of a buck-boost-based multi-level inverter circuit buck inverter unit according to a second embodiment of the present invention; fig. 2c is a circuit diagram of a third embodiment of a buck-boost-based multi-level inverter circuit buck inverter unit according to the embodiment of the invention.
In one embodiment of the present invention, the buck inverter unit 20 includes a first fully-controlled switching element S1, a second fully-controlled switching element S2, a first switching element, a first capacitor C1, and a second capacitor C2.
A first end of the first fully-controlled switching element S1 is connected to a first end of the first capacitor C1 and serves as a first connection end of the buck inverter unit 20, a second end of the second fully-controlled switching element S2 is connected to a second end of the second capacitor C2 and serves as a second connection end of the buck inverter unit 20, a second end of the first fully-controlled switching element S1 is connected to a first end of the second fully-controlled switching element S2 and a first end of the first switching element respectively and serves as a buck output end 21 of the buck inverter unit 20, and a second end of the first capacitor C1 is connected to a first end of the second capacitor C2 and a second end of the first switching element respectively; the first connection end of the voltage-reducing inverter unit 20 is connected to the negative electrode of the dc power supply 10, and the second connection end of the voltage-reducing inverter unit 20 is connected to the positive electrode of the dc power supply 10.
It should be noted that the first capacitor C1 and the second capacitor C2 may be electrolytic capacitors, and other types of capacitors may be used as long as the principles of the first capacitor C1 and the second capacitor C2 are satisfied, and the present application is not limited thereto.
In the first embodiment of the step-down inverter unit 20, as shown in fig. 2a, the first switching element is a bidirectional fully-controlled switch.
It should be noted that, as shown in fig. 3, the bidirectional fully-controlled switch may mainly be composed of two IGBT devices connected in series in an opposite direction, and the bidirectional fully-controlled switch may also be composed of two MOSFETs connected in series in an opposite direction.
In the second embodiment of the buck inverter unit 20, as shown in fig. 2b, the first switching element includes a third fully-controlled switching element S3, a fourth fully-controlled switching element S4, a first diode D1 and a second diode D2; a first terminal of the third fully-controlled switching element S3 is connected to an anode of the first diode D1 and a second terminal of the first fully-controlled switching element S1, respectively, and a cathode of the first diode D1 and an anode of the second diode are connected and serve as second terminals of the first switching element; the cathode of the second diode D2 is connected to the first terminal of the second fully-controlled switching element S2 and the second terminal of the fourth fully-controlled switching element S4, respectively, and the first terminal of the fourth fully-controlled switching element S4 is connected to the second terminal of the third fully-controlled switching element S3 and serves as the step-down output terminal 21 of the step-down inverter unit 20.
It should be noted that the diodes may be other types of diodes as long as the principles of the first diode D1 and the second diode D2 are satisfied, and the application is not limited herein.
In the third embodiment of the buck inverter unit 20, as shown in fig. 2C, the first switching element includes a third fully-controlled switching element S3, a fourth fully-controlled switching element S4, a fifth fully-controlled switching element S5, a sixth fully-controlled switching element S6, and a third capacitor C3; a first terminal of the third fully-controlled switching element S3 is connected to a first terminal of the fifth fully-controlled switching element S5, a second terminal of the first fully-controlled switching element S2, and a first terminal of the third capacitor C3, respectively, and a second terminal of the fifth fully-controlled switching element S5 and a first terminal of the sixth fully-controlled switching element S6 are connected to serve as a second terminal of the first switching element; a second terminal of the sixth fully-controlled switching element S6 is connected to the first terminal of the second fully-controlled switching element S2, the second terminal of the third capacitor C3, and the second terminal of the fourth fully-controlled switching element S4, respectively, and a first terminal of the fourth fully-controlled switching element S4 is connected to the second terminal of the third fully-controlled switching element S3 and serves as the step-down output terminal 21 of the step-down inverter unit 20.
The third capacitor C3 may be preferably an electrolytic capacitor, or may be another type of capacitor, as long as the principle of the third capacitor C3 is satisfied, and the present application is not limited thereto.
As shown in fig. 4a and 4b, fig. 4a is a circuit diagram of a first embodiment of a boost-buck-based multi-level inverter circuit of a boost-buck inverter unit according to an embodiment of the present invention; fig. 4b is a circuit diagram of a second embodiment of a boost-buck-based multi-level inverter circuit boost inverter unit according to an embodiment of the present invention.
In one embodiment of the present invention, the boosting inverting unit 30 includes a seventh fully-controlled switching element S7, an eighth fully-controlled switching element S8, a ninth switching element S9, a tenth switching element S10, an eleventh fully-controlled switching element S11, a twelfth fully-controlled switching element S12, a fourth capacitor S4, and a fifth capacitor S5; a first terminal of a seventh fully-controlled switching element S7 is connected to a second terminal of a tenth switching element S10 and serves as a first terminal of the boosting and inverting unit 30, a first terminal of a tenth switching element S10 is respectively connected to a first terminal of a fourth capacitor C4 and a first terminal of an eleventh fully-controlled switching element S11, a second terminal of an eleventh fully-controlled switching element S11 is connected to a first terminal of a twelfth fully-controlled switching element S12 and serves as a boosting output terminal 31 of the boosting and inverting unit 30, a second terminal of the twelfth fully-controlled switching element S12 is respectively connected to a first terminal of a fifth capacitor C5 and a second terminal of a ninth switching element S9, a first terminal of the ninth switching element S9 is connected to a second terminal of an eighth fully-controlled switching element S8 and serves as a second terminal of the boosting and inverting unit 30, a first end of the eighth fully-controlled switch element S8 is connected to the second end of the seventh fully-controlled switch element S7, and then respectively connected to the second end of the fourth capacitor C4 and the first end of the fifth capacitor C5; a first end of the boosting inverter unit 30 is connected to the negative electrode of the dc power supply 10, and a second end of the boosting inverter unit 30 is connected to the positive electrode of the dc power supply 10.
It should be noted that the fourth capacitor C4 and the fifth capacitor C5 may be electrolytic capacitors, and other types of capacitors may be used as long as the principles of the fourth capacitor C4 and the fifth capacitor C5 are satisfied, and the present application is not limited thereto. As shown in fig. 4a, the ninth switching element S9 and the tenth switching element S10 are both preferably fully controlled switching elements. As shown in fig. 4b, the ninth switching element S9 and the tenth switching element S10 are each preferably a diode, an anode of which is the first terminal of the switching element, and a cathode of which is the second terminal of the switching element. Other types of diodes may be used as the diodes, as long as the principles of the ninth switching element S9 and the tenth switching element S10 are satisfied, and the present application is not limited thereto.
As shown in fig. 5 and 6, fig. 5 is a circuit diagram of a buck-boost based multi-level inverter circuit according to an embodiment of the present invention, and fig. 6 is a switching logic diagram of the buck-boost based multi-level inverter circuit according to an embodiment of the present invention.
In the embodiment of the present invention, the voltage output by the dc power supply 10 is VdcAs shown in fig. 5 and 6, the first switching element in buck inverter unit 20 is a bidirectional full-control switch BS, and the ninth switching element S9 and the tenth switching element S10 in boost inverter unit 30 are diodes, for example. If the first full-control switch element S1, the eighth full-control switch element S8 and the twelfth full-control switch element S12 are turned on and other switch elements are all turned off, the AC output end U is connectedoThe output voltage is +2Vdc。
If the bidirectional full-control switch BS, the eighth full-control switch element S8 and the twelfth full-control switch element S12 are turned on, other switch elements are all turned off, and the alternating current output end U is connectedoThe output voltage is +1.5Vdc。
If the first full-control switch element S1, the seventh full-control switch element S7 and the twelfth full-control switch element S12 are turned on and other switch elements are all turned off, the AC output end U is connectedoThe output voltage is + Vdc。
If the bidirectional full-control switch BS, the seventh full-control switch element S7 and the twelfth full-control switch element S12 are turned on, other switch elements are all turned off, and the alternating current output end U is connectedoThe output voltage is 0.5Vdc。
If the second full-control switch element S2, the seventh full-control switch element S7 and the twelfth full-control switch element S12 are turned on and other switch elements are all turned off, the AC output end U is connectedoThe output voltage is 0.
If the bidirectional full-control switch BS, the eighth full-control switch element S8 and the eleventh full-control switch element S11 are turned on, other switch elements are all turned off, and the alternating current output end U is connectedoThe output voltage is-0.5Vdc。
If the first full-control switch element S1, the seventh full-control switch element S7 and the eleventh full-control switch element S11 are turned on and other switch elements are all turned off, the AC output end U is connected to the power supplyoThe output voltage is-Vdc。
If the bidirectional full-control switch BS, the seventh full-control switch element S7 and the eleventh full-control switch element S11 are turned on, other switch elements are all turned off, and the alternating current output end U is connectedoThe output voltage is-1.5Vdc。
If the second full-control switch element S2, the seventh full-control switch element S7 and the eleventh full-control switch element S11 are turned on and other switch elements are all turned off, the AC output end U is connectedoThe output voltage is-2Vdc。
As shown in FIG. 6 and known from the above, the output voltage of the buck-boost based multi-level inverter circuit can be from-2Vdc、-1.5VdcStep-by-step increase to +2VdcThen gradually reduced to-2VdcAnd the output of multilevel AC is realized by increasing and decreasing back and forth, so that the output voltage of the DC power supply is VdcThe amplitude of the alternating current output by the multi-level inverter circuit based on the boost and buck is 2Vdc. The first capacitor C1 and the second capacitor C2 have the same capacitance value, and the first capacitor C1 and the second capacitor C2 are connected in series and then connected in parallel with the dc power supply 10, so that the voltages of the first capacitor C1 and the second capacitor C2 are the same and equal to half of the voltage of the dc power supply 10, namely Vdc2; the first full-control switch element S1, the second full-control switch element S2 and the bidirectional full-control switch BS are conducted in a time-sharing mode; the voltage of the buck output terminal 21 of the buck inverter unit 20 may be at 0 and ± V with respect to the potential of the connection point of the first capacitor C1 and the second capacitor C2dc/2 the three levels are alternated; the seventh fully-controlled switching element S7 and the eighth fully-controlled switching element S8 are complementarily and alternately turned on, so that the fourth capacitor C4 and the fifth capacitor C5 are connected in parallel with the dc power supply 10 at time intervals, and the voltages of the fourth capacitor C4 and the fifth capacitor C5 are equal to the voltage V of the dc power supply 10dc(ii) a The eleventh fully-controlled switching element S11 and the twelfth fully-controlled switching element S12 are also complementarily and alternately turned on; according to a seventh full-control switch element S7, an eighth full-control switch elementThe voltage at the boost output terminal 31 of the boost inverter unit 30 can be within ± V by different turn-on sequences of the controlled switch element S8, the eleventh fully-controlled switch element S11 and the twelfth fully-controlled switch element S12dc2 and. + -. 3Vdc/2 the four levels alternate; therefore, according to the combination of different switching states of the first fully-controlled switching element S1, the second fully-controlled switching element S2, the bidirectional fully-controlled switch BS, the seventh fully-controlled switching element S7, the eighth fully-controlled switching element S8, the eleventh fully-controlled switching element S11 and the twelfth fully-controlled switching element S12, the buck-boost multi-level inverter circuit can output 0, ± V through the two buck output terminals 21 and the boost output terminal 31dc/2、±Vdc、±3V dc2 and. + -. 2VdcThese nine different ac levels.
Example two:
the embodiment of the invention also provides an inverter system, which comprises the boost-buck-based multi-level inverter circuit and a controller 40 for controlling each fully-controlled switching element in the boost-buck-based multi-level inverter circuit to be switched on or switched off, wherein the controller 40 controls each fully-controlled switching element in the boost-buck-based multi-level inverter circuit to be switched on or switched off to realize the output of multi-level alternating current.
It should be noted that the multi-level inverter circuit based on buck-boost is described in detail in the first embodiment, and is not illustrated in the first embodiment.
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 (5)
1. A multi-level inverter circuit based on voltage boosting and reducing is characterized by comprising a direct-current power supply, a voltage-reducing inverter unit, a voltage-boosting inverter unit, an alternating-current output end and a controller;
the direct current power supply is used for providing direct current power supply;
the voltage reduction inversion unit is connected with the direct current power supply in parallel, and the voltage reduction output end of the voltage reduction inversion unit is connected with the first end of the alternating current output end;
the boosting inversion unit is connected with the direct-current power supply in parallel, and the boosting output end of the boosting inversion unit is connected with the second end of the alternating-current output end;
the voltage reduction inversion unit and the voltage boosting inversion unit respectively comprise a plurality of full-control switching elements, the control end of each full-control switching element is also connected with a controller, and the controller controls the connection or disconnection of each full-control switching element in the voltage reduction inversion unit and the voltage boosting inversion unit so as to realize that the alternating current output end outputs multi-level alternating current;
the voltage reduction inversion unit comprises a first full-control switch element, a second full-control switch element, a first capacitor and a second capacitor; the boosting inversion unit comprises a seventh full-control switching element, an eighth full-control switching element, a ninth switching element, a tenth switching element, an eleventh full-control switching element, a twelfth full-control switching element, a fourth capacitor and a fifth capacitor; the first end of the first full-control switch element is connected with the first end of the first capacitor and serves as the first connection end of the voltage reduction inversion unit, the second end of the second full-control switch element is connected with the second end of the second capacitor and serves as the second connection end of the voltage reduction inversion unit, and the second end of the first full-control switch element is divided intoThe second end of the first capacitor is connected with the first end of the second capacitor and the second end of the first switch element respectively; the first connecting end of the voltage-reducing inversion unit is connected with the negative electrode of the direct-current power supply, and the second connecting end of the voltage-reducing inversion unit is connected with the positive electrode of the direct-current power supply; the first switch element is a bidirectional full-control switch, and the voltage output by the direct-current power supply is Vdc；
A first end of the seventh fully-controlled switching element is connected to a second end of the tenth switching element and serves as a first end of the boost inverting unit, a first end of the tenth switching element is respectively connected to a first end of the fourth capacitor and a first end of the eleventh fully-controlled switching element, a second end of the eleventh fully-controlled switching element is connected to a first end of the twelfth fully-controlled switching element and serves as a boost output end of the boost inverting unit, a second end of the twelfth fully-controlled switching element is respectively connected to a first end of the fifth capacitor and a second end of the ninth switching element, a first end of the ninth switching element is connected to a second end of the eighth fully-controlled switching element and serves as a second end of the boost inverting unit, and a first end of the eighth fully-controlled switching element is connected to a second end of the seventh fully-controlled switching element and then is respectively connected to a second end of the fourth capacitor and a first end of the fifth capacitor End connection; the first end of the boosting inversion unit is connected with the negative electrode of the direct current power supply, and the second end of the boosting inversion unit is connected with the positive electrode of the direct current power supply;
if the bidirectional full-control switch, the eighth full-control switch element and the twelfth full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end is +1.5Vdc(ii) a If the bidirectional full-control switch, the seventh full-control switch element and the eleventh full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end is-1.5Vdc；
If the first full-control switch element is turned onThe other switch elements are all turned off, and the voltage output by the alternating current output end UO is + Vdc(ii) a If the first full-control switch element, the seventh full-control switch element and the eleventh full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end UO is-Vdc；
If the first full-control switch element, the eighth full-control switch element and the twelfth full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end UO is +2Vdc(ii) a If the second full-control switch element, the seventh full-control switch element and the eleventh full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end UO is-2Vdc；
If the bidirectional full-control switch, the seventh full-control switch element and the twelfth full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end UO is 0.5Vdc(ii) a If the bidirectional full-control switch, the eighth full-control switch element and the eleventh full-control switch element are switched on and other switch elements are all switched off, the voltage output by the alternating current output end UO is-0.5Vdc；
If the second full-control switch element, the seventh full-control switch element and the twelfth full-control switch element are turned on, other switch elements are all turned off, and the voltage output by the alternating current output end Uo is 0.
2. The buck-boost based multi-level inverter circuit according to claim 1, wherein the bi-directional fully controlled switch comprises two reverse series connected IGBT devices or two reverse series connected MOSFETs.
3. The buck-boost based multi-level inverter circuit according to claim 1, wherein the ninth switching element and the tenth switching element are fully controlled switching elements or diodes; wherein the content of the first and second substances,
the anode of the diode is used as the first end of the switching element, and the cathode of the diode is used as the second end of the switching element.
4. The buck-boost-based multi-level inverter circuit according to claim 1, wherein each fully-controlled switching element in the buck inverter unit and the boost inverter unit is an N-channel MOSFET or a P-channel MOSFET or an IGBT device, and wherein:
when each full-control switch element is an N-channel MOSFET, the source electrode of the N-channel MOSFET is used as the first end of the full-control switch element, the drain electrode of the N-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the N-channel MOSFET is used as the control end of the full-control switch element;
when each full-control switch element is a P-channel MOSFET, the drain electrode of the P-channel MOSFET is used as the first end of the full-control switch element, the source electrode of the P-channel MOSFET is used as the second end of the full-control switch element, and the grid electrode of the P-channel MOSFET is used as the control end of the full-control switch element;
when each of the fully-controlled switch elements is an IGBT device, an emitter of the IGBT device is used as a first end of the fully-controlled switch element, a collector of the IGBT device is used as a second end of the fully-controlled switch element, and a base of the IGBT device is used as a control end of the fully-controlled switch element.
5. An inverter system comprising the buck-boost multi-level inverter circuit according to any one of claims 1 to 4 and a controller for controlling on/off of each fully-controlled switching element in the buck-boost multi-level inverter circuit, wherein the controller controls on/off of each fully-controlled switching element in the buck-boost multi-level inverter circuit to realize output of multi-level alternating current.
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| CN111884534A (en) * | 2020-07-13 | 2020-11-03 | 广东工业大学 | Multi-level boost inverter circuit based on switch capacitor and flying capacitor |
| CN113037115B (en) * | 2021-02-25 | 2022-07-05 | 国网福建省电力有限公司电力科学研究院 | Six-switch five-level inverter and working method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625037A (en) * | 2004-12-10 | 2005-06-08 | 华中科技大学 | Cascad multi-level inverter |
| JP2010246189A (en) * | 2009-04-01 | 2010-10-28 | Nagaoka Univ Of Technology | Power conversion equipment |
| CN103368427A (en) * | 2012-04-05 | 2013-10-23 | 艾默生网络能源有限公司 | Single-phase inverter and system thereof and three-phase inverter and system thereof |
| CN105071679A (en) * | 2015-07-20 | 2015-11-18 | 厦门大学 | Five-level self-balanced inverter based on bridge switched capacitor module |
| CN110098756A (en) * | 2019-05-30 | 2019-08-06 | 广东工业大学 | A kind of single supply cascade connection type switching capacity multi-level inverter circuit |
| CN110112943A (en) * | 2019-05-20 | 2019-08-09 | 广东工业大学 | A kind of both-end multi-level inverter circuit and inversion system |
-
2019
- 2019-11-28 CN CN201911194927.2A patent/CN110768556B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1625037A (en) * | 2004-12-10 | 2005-06-08 | 华中科技大学 | Cascad multi-level inverter |
| JP2010246189A (en) * | 2009-04-01 | 2010-10-28 | Nagaoka Univ Of Technology | Power conversion equipment |
| CN103368427A (en) * | 2012-04-05 | 2013-10-23 | 艾默生网络能源有限公司 | Single-phase inverter and system thereof and three-phase inverter and system thereof |
| CN105071679A (en) * | 2015-07-20 | 2015-11-18 | 厦门大学 | Five-level self-balanced inverter based on bridge switched capacitor module |
| CN110112943A (en) * | 2019-05-20 | 2019-08-09 | 广东工业大学 | A kind of both-end multi-level inverter circuit and inversion system |
| CN110098756A (en) * | 2019-05-30 | 2019-08-06 | 广东工业大学 | A kind of single supply cascade connection type switching capacity multi-level inverter circuit |
Non-Patent Citations (1)
| Title |
|---|
| A New Six-Switch Five-Level Boost-Active Neutral Point Clamped (5L-Boost-ANPC) Inverter;Yam P. Siwakoti;《IEEE》;20181231;第2424-2430页 * |
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