CN112054708A - Unipolar boost inverter of integrated switched capacitor circuit - Google Patents
Unipolar boost inverter of integrated switched capacitor circuit Download PDFInfo
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- CN112054708A CN112054708A CN202010908304.3A CN202010908304A CN112054708A CN 112054708 A CN112054708 A CN 112054708A CN 202010908304 A CN202010908304 A CN 202010908304A CN 112054708 A CN112054708 A CN 112054708A
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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
- 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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- 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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention belongs to the technical field of DC-AC conversion equipment, and relates to a single-pole boosting inverter circuit integrated with a switched capacitor circuit.A power storage unit comprises a switched capacitor network and a quasi-Z source capacitor network, a switch module adopts a traditional inverter bridge, and the drain electrode of an upper bridge wall power switch tube is respectively connected with a second inductor and the anode of a second capacitor in the quasi-Z source network; the source electrode of the lower bridge arm power switch tube is respectively connected with the negative electrode of the direct-current power supply, the cathode of the first capacitor in the quasi-Z source network and the cathode of the third capacitor in the switched capacitor network; the non-coupling inductance unit comprises a first inductance and a second inductance which are not coupled with each other; the circuit has the advantages of reasonable overall structural design, reliable electrical principle, safe use, environmental friendliness, simple operation, high power density and great application potential.
Description
Technical Field
The invention belongs to the technical field of DC-AC conversion equipment, and relates to a unipolar boost inverter circuit integrated with a switched capacitor circuit.
Background
At present, the energy crisis and the problem of environmental pollution are aggravated, and the rapid development of renewable energy sources is promoted. Solar energy has considerable development prospect as one of clean renewable energy sources. The traditional photovoltaic power generation system outputs the output voltage of the photovoltaic cells connected in series in multiple stages to a power grid by using a DC/AD inverter, but the structure of multiple stages has higher production cost and failure rate. On the basis, a DC/DC boost converter is added between the photovoltaic cell and the power grid to complete boosting and then perform inversion, but the structure of the DC/DC-DC/AC leads to the problems of complex system structure, low working efficiency and the like. The Z Source Inverter proposed by the literature 'Peng F Z.Z-Source Inverter [ J ]. IEEE Transactions on Industry Application,2003,39(2):504 and 510' is used as a novel single-stage buck-boost Inverter circuit to add a direct signal into an inversion traditional zero state, and simultaneously realizes the functions of boost and inversion, and has the advantages of simple circuit structure and high safety. However, the self topological structure of the Z-source inverter reflects that the boosting capacity of the Z-source inverter is limited, and the premise of obtaining high boosting is that the direct-through duty ratio is higher, so that the modulation factor of the inverter is reduced, the reverse regulation effect is achieved, and the application range of the Z-source inverter is limited. The transformer type Z-source inverter (Trans-ZSI) proposed by the documents of power electronics,2011,26(12): 3453-. On the basis, the inversion modulation factor is also larger, and higher inversion voltage gain can be obtained. However, the high turn ratio of the coupling inductor causes large leakage inductance, series resistance and other bad parameters, which not only reduces the working efficiency, but also causes large dc link voltage peak due to the energy released by the leakage inductance, and the inversion effect is poor, thereby affecting the working performance of the circuit. The Switched Capacitor Quasi-Switched Boost inverter proposed by the documents 'Nguyen M K, Duong T D, Lim Y C, Kim Y G, Switched-Capacitor quad-Switched Boost Inverters [ J ] IEEE transactions on industrial electronics,2018,65(6):5105-5113. vol.' realizes unipolar high Boost without coupling inductance by introducing a Switched Capacitor structure, but introduces an additional switching tube, thereby increasing the cost of the converter and the complexity of a control circuit.
In order to solve the problems, the multistage circuit can be used for cascading, and higher voltage gain is obtained under the condition of smaller through duty ratio, but the number of elements in the circuit is increased, the complexity of the circuit is improved, and the working efficiency is reduced. Therefore, finding an inverter circuit that can obtain a higher voltage gain at a lower through duty ratio, has a simple structure, a high working efficiency, and a good inverter effect has become a research focus in the present field.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and provides a unipolar voltage-boosting inverter integrated with a switched capacitor circuit.
In order to achieve the above object, the main structure of the unipolar boost inverter of the integrated switched capacitor circuit of the present invention includes a dc power supply, an energy storage unit, a non-coupled inductor unit, and a switch module, where the switch module controls whether the dc power supply and the non-coupled inductor unit provide or stop providing energy to a load by switching on or off; the energy storage unit comprises a switch capacitor network and a quasi-Z source capacitor network, and the switch module is a traditional inverter bridge and comprises six power switch tubes; the drain electrode of the upper bridge wall power switch tube is respectively connected with the second inductor and the anode of a second capacitor in the quasi-Z source network; the source electrode of the lower bridge arm power switch tube is respectively connected with the negative electrode of the direct-current power supply, the cathode of the first capacitor in the quasi-Z source network and the cathode of the third capacitor in the switched capacitor network; the non-coupling inductance unit comprises a first inductor and a second inductor which are not coupled with each other, one end of the first inductor is connected with the anode of the direct-current power supply, and the other end of the first inductor is respectively connected with the anode of a second diode, the cathode of a fourth capacitor and the anode of a fourth diode in the switched capacitor network; one end of the second inductor is respectively connected with the cathode of the third diode in the switched capacitor network, the first diode in the quasi-Z source network and the anode of the first capacitor in the quasi-Z source network.
The switched capacitor network structure consists of a second diode, a third diode, a fourth diode, a fifth diode, a third capacitor and a fourth capacitor, wherein the anode of the second diode is connected with the first inductor, and the cathode of the second diode is connected with the cathode of the second capacitor; the anode of the third diode is respectively connected with the cathode of the fifth diode and the anode of the fourth capacitor, and the cathode of the third diode is connected with the quasi-Z source network; the anode of the fourth diode is respectively connected with the cathodes of the first inductor, the second diode and the fourth capacitor, and the cathode of the fourth diode is connected with the anode of the third capacitor and the anode of the fifth diode; the anode of the fifth diode is respectively connected with the cathode of the fourth diode and the anode of the third capacitor, and the cathode of the fifth diode is respectively connected with the anode of the fourth capacitor and the anode of the third diode; the anode of the third capacitor is respectively connected with the cathode of the fourth diode and the anode of the fifth diode, and the cathode of the third capacitor is connected with the cathode of the direct-current power supply; the anode of the fourth capacitor is respectively connected with the cathode of the fifth diode and the anode of the third diode, and the cathode of the fourth capacitor is respectively connected with the first inductor, the anode of the second diode and the anode of the fourth diode.
The quasi-Z source network consists of a first capacitor, a second capacitor and a first diode, wherein the anode of the first diode is respectively connected with the cathode of the second diode and the cathode of the second capacitor, and the cathode of the first diode is respectively connected with the cathode of a third diode, the anode of the first capacitor and one end of a second inductor; the anode of the first capacitor is connected with the cathode of the first diode, the cathode of the third diode and one end of the second inductor respectively, and the cathode of the first capacitor is connected with the cathode of the direct-current power supply; the anode of the second capacitor is connected with the upper bridge arm of the inverter bridge and one end of the second inductor respectively, and the cathode of the second capacitor is connected with the anode of the first diode and the cathode of the second diode respectively.
The switching-on or switching-off of the switch module adopts a unipolar SPWM control mode, so that the working efficiency of the switch module can be improved, and the switching loss is reduced.
The inverter bridge has two working states in one working period, namely, the inverter bridge is in a through state, the fourth diode, the third diode and the first diode are in reverse cut-off, the second diode and the fourth diode are in forward conduction, at the moment, three main loops exist, the second capacitor discharges, and the second capacitor is connected with the input direct-current power supply in series to store energy for the first inductor; discharging the third capacitor, charging the fourth capacitor, and transferring energy from the third capacitor to the fourth capacitor to realize the process of switching a voltage pump in the capacitor; the first capacitor discharges energy to store energy for the second inductor; secondly, the inverter bridge is in a non-direct-connection state, the fourth diode, the third diode and the first diode are in forward conduction, the second diode and the fourth diode are in reverse cut-off, and the conduction process of energy in the state is direct-current power supply-first inductor-fourth capacitor-third diode-second inductor-VPNThe direct-current power supply and the first inductor are connected in series to charge the third capacitor, the second inductor charges the second capacitor through the first diode, and meanwhile, the direct-current power supply, the first inductor and the fourth capacitor are connected in series to charge the first capacitor.
Compared with the existing DC-AC boost converter, the invention adds a switched capacitor structure on the basis of the original Z source inverter, obviously improves the boost effect through the principle of a voltage pump, furthest improves the voltage gain under the condition of not increasing a coupling inductor and an additional switching tube, avoids the occurrence of the condition of limit duty ratio, realizes the function of wide-range voltage output under the condition of smaller duty ratio, reduces the electromagnetic interference, increases the reliability of the circuit operation, reduces the volume and the weight of a magnetic core inductor under the condition of having the same boost capability, reduces the voltage stress of elements, and improves the conversion efficiency and the power density of the converter; the circuit has the advantages of reasonable overall structural design, reliable electrical principle, safe use, environmental friendliness, simple operation, high power density and great application potential.
Description of the drawings:
fig. 1 is a schematic diagram of the main circuit structure of the present invention.
Fig. 2 is a schematic diagram of the on-state operation of the power switch tube according to the present invention.
Fig. 3 is a schematic diagram of the off state of the power switch tube according to the present invention.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
Example 1:
the schematic circuit diagram of this embodiment is shown in fig. 1, and includes a dc power supply VgThe direct-current power supply comprises an energy storage unit, a non-coupling inductance unit and a switch module, wherein the switch module controls a direct-current power supply V through switching on or offgAnd whether the uncoupled inductive unit provides or ceases to provide energy to the load; the energy storage unit comprises a switch capacitor network and a quasi-Z source capacitor network, the switch module is a traditional inverter bridge and comprises six power switch tubes S1-S6For changing the operating state of the converter, wherein the power switching tube S is arranged on the upper bridge wall1-S3Respectively with the second inductor L2And a second capacitor C in the quasi-Z source network2The anodes of the anode groups are connected; lower bridge arm power switch tube S4-S6Respectively with a DC power supply VgFirst capacitor C in negative electrode and quasi-Z source network1And a third capacitor C in the switched capacitor network3The cathodes of the two electrodes are connected; the non-coupling inductance unit comprises two first inductors L which are not coupled with each other1And a second inductance L2First inductance L1One end of (1) and a DC power supply VgIs connected with the anode of the first diode D, and the other end of the first diode D is respectively connected with a second diode D in the switched capacitor network2Anode of, fourth capacitor C4And a fourth diode D4The anodes of the anode groups are connected; second inductance L2One end of the first diode is respectively connected with a third diode D in the switch capacitor network3A cathode of,First diode D in quasi-Z source network1And a first capacitor C in the quasi-Z source network1The non-coupling inductance unit improves the voltage gain through the voltage pump technology of the switched capacitor, thereby not only avoiding the condition of the limit duty ratio of the converter, but also reducing the conduction and the switching loss of the switching tube.
The switched capacitor network structure of this embodiment is composed of four diodes D2-D5And two capacitors C3、C4Composition of a second diode D2Anode and first inductor L1Connected with the cathode and a second capacitor C2The cathodes of the two electrodes are connected; third diode D3Respectively with the fifth diode D5Cathode and fourth capacitor C4The cathode is connected with the quasi-Z source network; fourth diode D4Respectively with the first inductor L1A second diode D2And a fourth capacitance C4Is connected with the cathode of the third capacitor C3And a fifth diode D5The anodes of the anode groups are connected; fifth diode D5Respectively with a fourth diode D4Cathode and third capacitor C3Are connected with the anode and the cathode is respectively connected with a fourth capacitor C4And a third diode D3The anodes of the anode groups are connected; third capacitor C3Respectively with a fourth diode D4And a fifth diode D5Is connected with the anode of the cathode and the DC power supply VgThe negative electrodes are connected; fourth capacitor C4Respectively with the fifth diode D5And a third diode D3Are connected with the anode and the cathode are respectively connected with the first inductor L1A second diode D2And a fourth diode D4Are connected with each other.
The quasi-Z source network of the embodiment is composed of two capacitors C1、C2And a diode D1Composition of a first diode D1Respectively with the second diode D2And a second capacitor C2Are connected to the cathodes of the third diodes D, respectively3Cathode and first capacitor C1And the second inductor L2One end of the two ends are connected; a first capacitor C1Respectively with the first diode D1Cathode of (2), third diode D3And the cathode and the second inductor L2Is connected with one end of the cathode, and the cathode is connected with a direct current power supply VgThe negative electrodes are connected; second capacitor C2Respectively connected with the upper bridge arm of the inverter bridge and the second inductor L2Are connected to one end, and the cathodes are respectively connected to the first diodes D1And a second diode D2Are connected to each other.
Diode D in this embodiment1～D5The fast recovery diode is a semiconductor diode with the characteristics of good switching characteristic and short reverse recovery time, the internal structure of the fast recovery diode is different from that of a common PN junction diode, the fast recovery diode belongs to a PIN junction diode, namely, a base region I is added between a P-type silicon material and an N-type silicon material to form a PIN silicon chip, and the fast recovery diode can achieve the effects of short reverse recovery time, low forward voltage and high reverse voltage resistance when being applied to the embodiment because the base region is thin and the reverse recovery charge is very small.
In this embodiment, the switching module is turned on or off by using an SPWM control method, and the SPWM control method includes a bipolar SPWM control method and a unipolar control method. Compared with a unipolar mode, the bipolar SPWM mode control circuit and the main circuit are simpler, but the unipolar SPWM mode has smaller high harmonic components in output voltage than the bipolar SPWM mode, and the switching-on or switching-off of the switch module is realized by the unipolar SPWM control method, so that the working efficiency of the switch module can be improved, and the switching loss is reduced.
The working state diagram of the present embodiment is shown in fig. 2 and 3. In one working period, there are two working states in total, the working state in the through state is schematically shown in fig. 2, and the fourth diode D4A third diode D3A first diode D1Reverse cut-off, second diode D2A fourth diode D4Forward conduction, when there are three main loops, the second capacitor C2Discharging, the first inductance L being connected in series with the input DC power supply1Storing energy; third capacitor C3Discharge, fourth capacitance C4Charging, energy from a third capacitor C3Transferred to a fourth capacitor C4The process of voltage pump in the switched capacitor is realized; a first capacitor C1Discharging into a second inductance L2Storing energy; FIG. 3 shows the operating state in the non-through state, the fourth diode D4A third diode D3A first diode D1Forward conducting, second diode D2A fourth diode D4Reverse cut-off, in which the energy is conducted by the DC power supply VgFirst inductance L1-a fourth capacitance C4-a third diode D3A second inductance L2-VPND.C. power supply VgAnd a first inductance L1Connected in series to a third capacitor C3Charging, second inductance L2Through a first diode D1To the second capacitor C2Charging, and at the same time, DC power supply VgA first inductor L1A fourth capacitor C4Connected in series as a first capacitor C1And (6) charging.
The topology structure of the inverter described in this embodiment has two operation modes in a specific operation process:
in the mode I, namely when the inverter bridge is in a direct-through state, the KVL law of the circuit can be obtained:
when the mode II, namely the inverter bridge is in a non-through state, the KVL law of the circuit can be obtained:
by means of a first inductance L1A second L2The expression of the output direct current bus voltage obtained by the volt-second balance rule is as follows:
where B is the voltage gain of the converter and DshIs the duty cycle.
Example 2:
in this embodiment, when the output voltage is required to be converted to 3.63 times the input voltage, if the output voltage expression of the conventional quasi-Z source topology is adopted:
when the requirement of output voltage is met, the duty ratio value is 0.362, and at the moment, due to the limitation of the modulation ratio, the duty ratio of the switching tube of the inverter bridge is in a limit state, so that the working efficiency and the quality of an output waveform are influenced, and related devices are greatly damaged;
when the converter gain expression proposed according to the present embodiment:
when the through duty cycle is 0.15, the output requirement is achieved. Therefore, compared with the original quasi-Z source topology, the present embodiment can realize the output of the wide-range voltage, avoid the occurrence of the limit duty cycle, effectively improve the working efficiency of the topology, and reduce the loss of each device.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (4)
1. A single-pole voltage-boosting inverter integrated with a switched capacitor circuit is characterized in that a main structure comprises a direct-current power supply, an energy storage unit, a non-coupling inductance unit and a switch module, wherein the switch module controls whether the direct-current power supply and the non-coupling inductance unit provide or stop providing energy for a load through switching on or off; the energy storage unit comprises a switch capacitor network and a quasi-Z source capacitor network, the switch module is a traditional inverter bridge, and the drain electrode of an upper bridge wall power switch tube of the inverter bridge is respectively connected with a second inductor and the anode of a second capacitor in the quasi-Z source network; the source electrode of the lower bridge arm power switch tube is respectively connected with the negative electrode of the direct-current power supply, the cathode of the first capacitor in the quasi-Z source network and the cathode of the third capacitor in the switched capacitor network; the non-coupling inductance unit comprises a first inductor and a second inductor which are not coupled with each other, one end of the first inductor is connected with the anode of the direct-current power supply, and the other end of the first inductor is respectively connected with the anode of a second diode, the cathode of a fourth capacitor and the anode of a fourth diode in the switched capacitor network; one end of the second inductor is respectively connected with the cathode of the third diode in the switched capacitor network, the first diode in the quasi-Z source network and the anode of the first capacitor in the quasi-Z source network.
2. The unipolar scalable inverter of integrated switched capacitor circuits of claim 1 wherein said switched capacitor network structure is comprised of a second diode, a third diode, a fourth diode and a fifth diode, a third capacitor and a fourth capacitor, the anode of the second diode being connected to the first inductor and the cathode of the second diode being connected to the cathode of the second capacitor; the anode of the third diode is respectively connected with the cathode of the fifth diode and the anode of the fourth capacitor, and the cathode of the third diode is connected with the quasi-Z source network; the anode of the fourth diode is respectively connected with the cathodes of the first inductor, the second diode and the fourth capacitor, and the cathode of the fourth diode is connected with the anode of the third capacitor and the anode of the fifth diode; the anode of the fifth diode is respectively connected with the cathode of the fourth diode and the anode of the third capacitor, and the cathode of the fifth diode is respectively connected with the anode of the fourth capacitor and the anode of the third diode; the anode of the third capacitor is respectively connected with the cathode of the fourth diode and the anode of the fifth diode, and the cathode of the third capacitor is connected with the cathode of the direct-current power supply; the anode of the fourth capacitor is respectively connected with the cathode of the fifth diode and the anode of the third diode, and the cathode of the fourth capacitor is respectively connected with the first inductor, the anode of the second diode and the anode of the fourth diode.
3. The unipolar scalable inverter of the integrated switched capacitor circuit of claim 1, wherein the quasi-Z source network is comprised of a first capacitor, a second capacitor, and a first diode, an anode of the first diode being connected to a cathode of the second diode and a cathode of the second capacitor, respectively, and a cathode of the first diode being connected to a cathode of the third diode, an anode of the first capacitor, and one terminal of the second inductor, respectively; the anode of the first capacitor is connected with the cathode of the first diode, the cathode of the third diode and one end of the second inductor respectively, and the cathode of the first capacitor is connected with the cathode of the direct-current power supply; the anode of the second capacitor is connected with the upper bridge arm of the inverter bridge and one end of the second inductor respectively, and the cathode of the second capacitor is connected with the anode of the first diode and the cathode of the second diode respectively.
4. The unipolar scalable inverter of the integrated switched capacitor circuit of claim 1, wherein the switching modules are turned on or off in a unipolar SPWM control scheme.
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