CN117477975A - Common-ground type switch capacitor multi-level inverter - Google Patents

Common-ground type switch capacitor multi-level inverter Download PDF

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Publication number
CN117477975A
CN117477975A CN202311815217.3A CN202311815217A CN117477975A CN 117477975 A CN117477975 A CN 117477975A CN 202311815217 A CN202311815217 A CN 202311815217A CN 117477975 A CN117477975 A CN 117477975A
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CN
China
Prior art keywords
power switch
switch tube
capacitor
terminal
power supply
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Withdrawn
Application number
CN202311815217.3A
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Chinese (zh)
Inventor
姚佳
嵇保健
吕绪良
李晓鹏
任宇航
任宇珂
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Nanjing Zhiyin Technology Co ltd
Zhejiang Shangyue New Energy Development Co ltd
Nanjing University of Science and Technology
Original Assignee
Nanjing Zhiyin Technology Co ltd
Zhejiang Shangyue New Energy Development Co ltd
Nanjing University of Science and Technology
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Priority to CN202311815217.3A priority Critical patent/CN117477975A/en
Publication of CN117477975A publication Critical patent/CN117477975A/en
Withdrawn legal-status Critical Current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
    • H02M7/483—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
    • H02M7/53—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

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

Abstract

The invention relates to a common-ground type switch capacitor multi-level inverter, which comprises: a base unit, an auxiliary branch and an expandable unit; the base unit includes: DC power supplyPower switch tubePower switch tubePower switch tubePower switch tubePower switch tubeCapacitanceThe method comprises the steps of carrying out a first treatment on the surface of the The auxiliary branch comprises: power switch tubePower switch tubePower switch tubePower switch tubeAuxiliary capacitor. The beneficial effects of the invention are as follows: the capacitors of the basic unit and the expandable unit are connected in series to supply power to the load so as to realize multi-level output and the capacitors in the auxiliary branch circuitThe capacitor is used for charging the capacitor and reducing the voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced. The input and output are grounded together, so that leakage current from an input power supply to a load end can be eliminated, and the method is suitable for application occasions such as photovoltaic power generation requiring high power density.

Description

Common-ground type switch capacitor multi-level inverter
Technical Field
The invention relates to the field of power converters, in particular to a common-ground type switched capacitor multi-level inverter.
Background
In the application of renewable energy grid-connected systems, electric automobiles, flexible alternating current transmission systems or other alternating current distributed power generation systems, compared with a two-level inverter, the multi-level inverter (MLI) has the advantages of low Total Harmonic Distortion (THD), modularization, high fault tolerance and the like.
For renewable energy source application, especially in the field of high-performance flexible photovoltaic power generation, the battery has the characteristics of wide power generation power range, large voltage variation range and the like. In addition, the flexible photovoltaic cell is light in volume and is often used for occasions such as unmanned aerial vehicles, and the interface power supply of the flexible photovoltaic cell has the characteristics of high power density, light weight, wide voltage gain adjustment range and the like besides the performance of a conventional photovoltaic power generation system.
When the output voltage is in AC multi-level, the capacitor of the switch capacitor type inverter needs to be continuously discharged in the working level period, and in order to reduce the ripple wave of the capacitor and improve the quality of the output voltage, a large capacitor (more than millifarads level) is needed. When the output voltage is power frequency or low frequency, the capacitor discharge period is long, so that the capacitance is large, and the power density of the power supply is greatly reduced. In the aspect of capacitor type selection, the electrolytic capacitor has large capacity, but low reliability and precision, and influences the service life and reliability of a power supply. How to realize the low capacitance of the switch capacitance type multi-level inverter, and reducing the whole volume and weight of the power supply become key of the current research.
Disclosure of Invention
The invention aims to provide a novel common-ground type switch capacitor multi-level inverter aiming at the defects of the traditional switch capacitor multi-level inverter. The capacitors of the basic unit and the expandable unit are connected in series to supply power to the load so as to realize multi-level output and the capacitors in the auxiliary branch circuit The capacitor is used for charging the capacitor and reducing the voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a common-ground switched-capacitor multi-level inverter comprising: a base unit, an auxiliary branch and an expandable unit;
the base unit includes: DC power supplyPower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->；
The auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Power switch tube->Auxiliary capacitor->；
The expandable unit includes: power switch tubePower switch tube->Power switch tube->Power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->Capacitance->；
Power switch tubeAn upper access port of the expandable unit is formed by the first end of the expandable unit; power switch tube->A second end of the expandable unit forms a lower access port of the expandable unit; power switch tube->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the first member; power switch tube->Is a second terminal of (2) and a power switch tube- >Is a power switch tube>Is connected to the first end of the housing; capacitance->Is a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the first end of the housing; capacitance->Is a second terminal of (2) and a power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the first member; power switch tube->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the first member; power switch tube->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the first end of the housing; capacitance->Is a first terminal of (2) and power switch tube->An upper outlet port of the expandable unit is formed by connecting the first ends of the expandable units; capacitance->Is a second terminal of (2) and a power switch tube->The second ends of the expandable units are connected and form a lower output port of the expandable units;
DC power supplyPositive terminal and power switch tube of (2)>Is connected to the first end of the housing; DC power supply->Is a negative terminal and a power switch tube>Is a power switch tube>Is connected to the second end of the first member; DC power supply->Is grounded; capacitance->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->The first end of the expandable unit is connected with an upper access port of the expandable unit; capacitance->Is a second terminal of (2) and a power switch tube- >The second end of the expandable unit is connected with the lower access port of the expandable unit; power switch tube->The first end of the expandable unit is connected with the upper output port of the expandable unit; power switch tube->The second end of the expandable unit is connected with the lower output port of the expandable unit; power switch tube->Is a second terminal of (2) and a power switch tube->Is connected to the first end of the ground to form an output port；
Capacitance deviceIs a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the second end of the first member;capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the first end of the housing; power switch tubeIs>Is connected to the first end of the housing; power switch tube->Is a second terminal and a capacitance->Is connected to the second end of the first member; power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the positive end of the connecting rod; power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the negative terminal of the battery.
As a further scheme of the invention: power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube- >Power switch tube->Power switch tube->Power switch tubeIs a unidirectional voltage-resistant full-control power switch device;
power switch tubePower switch tube->Power switch tube->Power switch tube->Is a bidirectional voltage-resistant fully-controlled power switch device.
As a further scheme of the invention: and the control is performed by adopting a latest level approximation modulation mode or a sinusoidal pulse width modulation mode.
As a further scheme of the invention: a common-ground switched-capacitor multilevel inverter has a zero-level voltage output state with an output voltage of zero;
in a zero-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->、/>、/>And->Charging; in another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->、/>、/>And->And (5) charging.
As a further scheme of the invention: a common-ground type switch capacitor multi-level inverter has a level voltage output state with output voltage being a power supply voltage value;
in a level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube 、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->、/>、/>And->Charging, DC power supply->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、、/>、/>、/>、/>And->Conduction and power onTube closing->、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->、/>、/>And->Charging, DC power supply->Discharging to load->。
As a further scheme of the invention: a common-ground type switch capacitor multi-level inverter has a two-level voltage output state with an output voltage twice the power supply voltage value;
in a two-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->And->Charging; capacitance->、/>Parallel and direct current power supply->Discharging in series to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>Anddisconnecting; DC power supply->Give the capacitor->Charging; capacitance->By capacitance->Post-charge and DC power supply->Discharging in series to a load。
As a further scheme of the invention: a common-ground type switch capacitor multi-level inverter has a three-level voltage output state with an output voltage of three times the power supply voltage value;
In a three-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->And->Charging; capacitance->And->And direct current power supply->Discharging in series to load->In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->Charging; capacitance->By capacitance->Post-charge and capacitance->Direct current power supply +.>Discharging in series to a load。
As a further scheme of the invention: a common-ground switched capacitor multi-level inverter has a negative one-level voltage output state with an output voltage of a negative supply voltage value;
in a negative one-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->、/>And->Charging; capacitance->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor- >、And->Charging; capacitance->Discharging to load->；
A common-ground switched-capacitor multi-level inverter has a negative two-level voltage output state with an output voltage that is twice the value of the supply voltage;
in a negative two-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->Charging; capacitance->And->Parallel connection and capacitance->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; capacitance->By capacitance->Post-charge and capacitance->Discharging in series to load->；
A common-ground switched capacitor multi-level inverter has a negative three-level voltage output state with an output voltage of three times the negative supply voltage value;
in a negative three-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>And->ConductionThe method comprises the steps of carrying out a first treatment on the surface of the Power switch tube->、/>、/>、/>、/>、/>、/>、/>And->Disconnecting; DC power supply->Give the capacitor->Charging, capacitance->、/>Anddischarging in series to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +. >、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>、/>、/>、/>And->Disconnecting; capacitance->By capacitance->Post-charge and capacitance->、/>Discharging in series to load->。
A common-ground switched-capacitor multi-level inverter comprising: a base unit, an auxiliary branch and an expandable unit;
the expandable unit comprises a plurality of expandable base units; a plurality of expansion foundation units are connected in series in sequence; the extension base unit includes: the power supply comprises an upper first power switch tube, an upper second power switch tube, a lower first power switch tube, a lower second power switch tube, a middle power switch tube and a unit capacitor;
the first end of the upper first power switch tube forms an upper access port of the expansion base unit; the second end of the lower first power switch tube forms a lower access port of the expansion base unit; the first end of the middle power switch tube is connected with the second end of the upper first power switch tube and the second end of the upper second power switch tube; the second end of the middle power switch tube is connected with the first end of the lower first power switch tube and the first end of the lower second power switch tube; the first end of the unit capacitor is connected with the first end of the upper second power switch tube and forms an upper output port of the expansion base unit; the second end of the unit capacitor is connected with the second end of the lower second power switch tube and forms a lower output port of the expansion base unit;
The upper access port and the lower access port of the first expansion base unit in series connection respectively form an upper access port and a lower access port of the expandable unit; the upper outlet port and the lower outlet port of the last expansion base unit connected in series respectively form an upper outlet port and a lower outlet port of the expandable unit;
the base unit includes: DC power supplyPower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->；
The auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Power switch tube->Auxiliary capacitor->；
DC power supplyPositive terminal and power switch tube of (2)>Is connected to the first end of the housing; DC power supply->Is a negative terminal and a power switch tube>Is a power switch tube>Is connected to the second end of the first member; DC power supply->Is grounded; capacitance->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->The first end of the expandable unit is connected with an upper access port of the expandable unit; capacitance->Is a second terminal of (2) and a power switch tube->The second end of the expandable unit is connected with the lower access port of the expandable unit; power switch tube->The first end of the expandable unit is connected with the upper output port of the expandable unit; power switch tube- >The second end of the expandable unit is connected with the lower output port of the expandable unit; power switch tube->Is a second terminal of (2) and a power switch tube->Is connected to the first terminal of (2) and forms an output port with ground +.>；
Capacitance deviceIs a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the second end of the first member; capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the first end of the housing; power switch tubeIs>Is connected to the first end of the housing; power switch tube->Is a second terminal and a capacitance->Is connected to the second end of the first member; power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the positive end of the connecting rod; power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the negative terminal of the battery.
As a further scheme of the invention: a common-ground switched capacitor multi-level inverter has a plurality of output voltages; the common-ground type switched capacitor multi-level inverter has two different working modes for each output voltage; the output voltage is used for high-frequency switching between two working modes during output.
Compared with the prior art, the invention has the beneficial effects that: the capacitors of the basic unit and the expandable unit are connected in series to supply power to the load so as to realize multi-level output and the capacitors in the auxiliary branch circuit The capacitor is used for charging the capacitor and reducing the voltage ripple of the capacitor, so that the capacitance value of the capacitor is greatly reduced.
The input and output are grounded together, so that leakage current from an input power supply to a load end can be eliminated, and the method is suitable for application occasions such as photovoltaic power generation requiring high power density.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
Drawings
FIG. 1 is a circuit diagram of a common-ground switched-capacitor multi-level inverter of the present invention employing two extended base units;
FIG. 2 is an output waveform of the common-mode switched-capacitor multi-level inverter of FIG. 1 in a sinusoidal pulse width modulation mode;
FIG. 3 is a schematic diagram of an extension of the common-ground switched-capacitor multi-level inverter of FIG. 1;
FIG. 4a is a schematic diagram of an operational mode in which the output voltage of a common-mode switched-capacitor multi-level inverter of FIG. 1 is zero, the current trend being shown by arrows;
FIG. 4b is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is zero, with the current trend shown by arrows;
FIG. 4c is a schematic diagram of an operation mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is at a level, the current trend being shown by arrows;
FIG. 4d is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is at a level, the current trend being shown by arrows;
FIG. 4e is a schematic diagram of an operation mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is two-level, the current trend being shown by arrows;
FIG. 4f is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is two-level, with the current trend shown by the arrow;
FIG. 4g is a schematic diagram of an operational mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is three levels, with the current trend shown by arrows;
FIG. 4h is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is three levels, with the current trend shown by the arrows;
FIG. 4i is a schematic diagram of an operating mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is negative, the current trend being shown by arrows;
FIG. 4j is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is negative, with the current trend shown by the arrow;
FIG. 4k is a schematic diagram of an operating mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is negative two levels, with current flow indicated by arrows;
FIG. 4l is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is negative two levels, with the current trend shown by the arrows;
FIG. 4m is a schematic diagram of an operational mode in which the output voltage of the common-mode switched-capacitor multi-level inverter of FIG. 1 is negative three levels, with current flow shown by arrows;
fig. 4n is a schematic diagram of another mode of operation in which the output voltage of the common-mode switched-capacitor multi-level inverter of fig. 1 is negative three levels, with the current trend shown by the arrows.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a common-ground switched capacitor multi-level inverter can achieve 7 levels. A common-ground switched-capacitor multi-level inverter comprising: a base unit S1, an auxiliary branch S2 and a scalable unit S3.
The base unit S1 includes: DC power supplyPower switch tube->Power switch tube->Power switchTube->Power switch tube->Power switch tube->Capacitance->。
The auxiliary branch S2 comprises: power switch tubePower switch tube->Power switch tube->Power switch tubeAuxiliary capacitor->。
The expandable unit S3 includes: power switch tubePower switch tube->Power switch tube->Power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->Capacitance->。
Power switch tubeConstitutes the upper access port 1' of the scalable unit S3. Power switch tube->The second end of (a) constitutes the lower access port 2' of the scalable unit S3. Power switch tube->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the first connector. Power switch tube->Is a second terminal of (2) and a power switch tube->Is a power switch tube >Is connected to the first end of the housing. Capacitance->Is a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the first end of the housing. Capacitance->Is a second terminal of (2) and a power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the first connector. Power switch tube->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the second end of the housing. Power switch tube->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is the first end of (1)Are connected.
Capacitance deviceIs a first terminal of (2) and power switch tube->Is connected to and constitutes the upper outlet port 4' of the expandable unit S3. Capacitance->Is a second terminal of (2) and a power switch tube->Is connected to and constitutes the lower outlet port 3' of the expandable unit S3.
DC power supplyPositive terminal and power switch tube of (2)>Is connected to the first end of the housing. DC power supply->Is a negative terminal and a power switch tube>Is a power switch tube>Is connected to the second end of the first connector. DC power supply->The negative terminal of (2) is grounded. Capacitance->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the upper access port 1' of the expandable unit S3. Capacitance->Is a second terminal of (2) and a power switch tube->Is connected to the lower access port 2' of the expandable unit S3. Power switch tube- >Is connected to the upper outlet port 4' of the expandable unit S3. Power switch tube->Is connected to the lower outlet port 3' of the expandable unit S3. Power switch tube->Is a second terminal of (2) and a power switch tube->Is connected to the first terminal of (2) and forms an output port with ground +.>。
Capacitance deviceIs a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the second end of the first connector. Capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the first end of the housing. Power switch tubeIs>Is connected to the first end of the housing. Power switch tube->Is a second terminal and a capacitance->Is connected to the second end of the first connector. Power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the positive end of the connecting rod. Power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the negative terminal of the battery.
Specifically, power switching tubePower switch tube->Power switch tube->Power switch tube->Power onTube closing->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Is a unidirectional voltage-resistant fully-controlled power switch device. Power switch tube- >Power switch tube->Power switch tube->Power switch tube->Is a bidirectional voltage-resistant fully-controlled power switch device.
As a specific embodiment, referring to fig. 2, the common-ground switched capacitor multilevel inverter is controlled by adopting a sinusoidal pulse width modulation mode. As an alternative embodiment, the control may also be performed by using a recent level approximation modulation scheme.
As a specific embodiment, a common-mode switched-capacitor multi-level inverter has a plurality of output voltages. A common-ground switched capacitor multi-level inverter has two different modes of operation for each output voltage. The output voltage is used for high-frequency switching between two working modes during output. During each voltage level output period, the high frequency switches two switching modes, and the redundant switching states can enable the capacitor to be used for switchingAnd other capacitors are charged, and the voltage ripple of the capacitor is reduced, so that the capacitance value of the capacitor is greatly reduced.
A common-ground switched-capacitor multi-level inverter has a zero-level voltage output state with an output voltage of zero. The output voltage is zero. In a zero-level voltage output state, a common-ground type switched capacitor multi-level inverter has two working modes.
In one mode of operation, as shown in FIG. 4a, the power switch tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->、、/>And->And (5) charging. Power switch tube->、/>、/>、/>、/>Form a closed loop, which is a load->And a freewheel path is provided to realize zero-level output. In another mode of operation, as shown in FIG. 4b, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->、/>、/>And->And (5) charging. Power switch tube->、/>、/>、/>、/>Form a closed loop, which is a load->And a freewheel path is provided to realize zero-level output.
A common-ground type switched capacitor multi-level inverter has a level voltage output state in which the output voltage is the supply voltage value. The output voltage is at a level. In a level voltage output state, a common-ground switched capacitor multi-level inverter has two modes of operation. In one mode of operation, as shown in FIG. 4c, the power switch tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->、/>、/>And->Charging, DC power supply->Discharging to load->A level output is realized. In another mode of operation, as shown in FIG. 4d, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>And- >And (5) disconnecting. DC power supply->Give the capacitor->、/>、/>And->Charging, DC power supply->Discharging to load->A level output is realized.
A common-ground type switched capacitor multi-level inverter has a two-level voltage output state in which the output voltage is twice the supply voltage value. The output voltage is two levels. At the position ofThe two-level voltage output state is that a common-ground type switch capacitor multi-level inverter has two working modes. In one mode of operation, as shown in FIG. 4e, the power switch tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->And->And (5) charging. Capacitance->、/>Parallel and direct current power supply->Discharging in series to load->And realizing two-level output. In another mode of operation, as shown in FIG. 4f, the power switch tube +.>、/>、/>、/>、/>、/>、/>、/>、、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->And (5) charging. Capacitance->By capacitance->Post-charge and DC power supply->Discharging in series to load->And realizing two-level output.
A common-ground type switched capacitor multi-level inverter has a three-level voltage output state in which the output voltage is three times the supply voltage value. The output voltage is three levels. In a three-level voltage output state, a common-ground type switched capacitor multi-level inverter has two working modes. In one mode of operation, as shown in FIG. 4g, the power switch tube 、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supplyGive the capacitor->And->And (5) charging. Capacitance->And->And direct current power supply->Discharging in series to load->Three-level output is realized. In another mode of operation, as shown in FIG. 4h, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>Andconducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->And (5) charging. Capacitance->By capacitance->Post-charge and capacitance->Direct current power supply +.>Discharging in series to load->Three-level output is realized.
A common-ground switched-capacitor multilevel inverter has a negative one-level voltage output state with an output voltage of a negative supply voltage value. The output voltage is negative one level. At a negative level voltageThe output state is that a common-ground type switch capacitor multi-level inverter has two working modes. In one mode of operation, as shown in FIG. 4i, the power switch tube、/>、/>、/>、、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->、/>And->And (5) charging. Capacitance->Discharging to load->Negative one-level output is realized. In another mode of operation, as shown in FIG. 4j, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->、/>And->And (5) charging. Capacitance- >Discharging to load->Negative one-level output is realized.
A common-ground switched-capacitor multilevel inverter has a negative two-level voltage output state with an output voltage that is twice the value of the supply voltage. The output voltage is negative two levels. In a negative two-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes. In one mode of operation, as shown in FIG. 4k, the power switch tube、/>、/>、、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->And (5) charging. Capacitance->And->Parallel connection and capacitance->Discharging to load->And realizing negative two-level output. In another mode of operation, as shown in FIG. 4l, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. Capacitance->By capacitance->Post-charge and capacitance->Discharging in series to load->And realizing negative two-level output.
A common-ground switched-capacitor multi-level inverter has a negative three-level voltage output state with an output voltage that is three times the negative supply voltage value. The output voltage is negative three levels. In a negative three-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes. In one mode of operation, as shown in FIG. 4m, the power switch tube 、/>、/>、、/>、/>、/>、/>、/>And->Conducting. Power switch tube->、/>、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. DC power supply->Give the capacitor->Charging, capacitance->、/>And->Discharging in series to load->Negative three-level output is realized. In another mode of operation, as shown in FIG. 4n, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>、/>、/>、/>And->And (5) disconnecting. Capacitance->By capacitance->Post-charge and capacitance->、/>Discharging in series to load->Negative three-level output is realized.
The above description has been made of a common-ground type switched capacitor multilevel inverter capable of realizing 7 levels. The number of levels achievable by the common-mode switched capacitor multilevel inverter is based on the number of extended base units of the expandable unit. When extended to a capacitorThe output AC voltage level number is 2n+1, n is a natural number greater than or equal to 2. The number of extended base units is n-1 at this time. The extension of the 7-level common-ground switched-capacitor multilevel inverter to capacitor +.>I.e. n=3. The number of extension base units is 2.
As shown in fig. 3, a common-ground switched capacitor multi-level inverter includes: a base unit S1, an auxiliary branch S2 and a scalable unit S3.
The expandable unit comprises a plurality of expandable base units. The expansion foundation units are connected in series in sequence. The extension base unit includes: the power supply comprises an upper first power switch tube, an upper second power switch tube, a lower first power switch tube, a lower second power switch tube, a middle power switch tube and a unit capacitor. The first end of the upper first power switch tube forms an upper access port of the extension base unit. The second end of the lower first power switch tube forms a lower access port of the extension base unit. The first end of the middle power switch tube is connected with the second end of the upper first power switch tube and the second end of the upper second power switch tube. The second end of the middle power switch tube is connected with the first end of the lower first power switch tube and the first end of the lower second power switch tube. The first end of the unit capacitor is connected with the first end of the upper second power switch tube and forms an upper output port of the extended basic unit. The second end of the unit capacitor is connected with the second end of the lower second power switch tube and forms a lower output port of the extension base unit. The upper access port and the lower access port of the first expansion base unit connected in series respectively form an upper access port and a lower access port of the expandable unit. The upper outlet port and the lower outlet port of the last expansion base unit in series connection respectively form an upper outlet port and a lower outlet port of the expandable unit. The plurality of extension base units are sequentially connected in series, which means that an upper access port of a later extension base unit is connected to an upper access port of a previous extension base unit, and a lower access port of the later extension base unit is connected to a lower access port of the previous extension base unit.
Power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->And capacitance->A first extension base unit is formed. Power switch tube->As the upper first power switch tube. Power switch tubeAs an upper second power switch tube. Power switch tube->As the lower first power switch tube. Power switch tube->As a lower second power switch tube. Power switch tube->As a medium power switching tube. Capacitance->As a cell capacitance.
Power switch tubePower switch tube->Power switch tube->Power switch->Power switch tube->And capacitance->A second extension base unit is formed. Power switch tube->As the upper first power switch tube. Power switch tubeAs an upper second power switch tube. Power switch tube->As the lower first power switch tube. Power switch->As a lower second power switch tube. Power switch tube->As a medium power switching tube. Capacitance->As a cell capacitance.
Different numbers of extension base units may be extended as desired. For example, when expanding to the n-1 th, the last expansion unit is formed by a power switch tubePower switch tube->Power switch tube->Power switch tube- >Power switch tube->And capacitance->The last extension base unit is formed. Power switch tube->As the upper first power switch tube.
Power switch tubeAs an upper second power switch tube. Power switch tube->As the lower first power switch tube. Power switch tube->As a lower second power switch tube. Power switch tube->As a medium power switching tube. Capacitance->As a cell capacitance.
The base unit S1 includes: DC power supplyPower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->。
The auxiliary branch S2 comprises: power switch tubePower switch tube->Power switch tube->Power switch tubeAuxiliary capacitor->。
DC power supplyPositive terminal and power switch tube of (2)>Is connected to the first end of the housing. DC power supply->Is a negative terminal and a power switch tube>Is a power switch tube>Is connected to the second end of the first connector. DC power supply->The negative terminal of (2) is grounded. Capacitance->Is a first terminal of (2) and power switch tube->Second terminal of (2) power switch tube->Is connected to the upper access port 1' of the expandable unit S3. Capacitance->Is a second terminal of (2) and a power switch tube->Is connected to the lower access port 2' of the expandable unit S3.
Power switch tubeIs connected to the upper outlet port 4' of the expandable unit S3. Power switch tube->Is connected to the lower outlet port 3' of the expandable unit S3. Power switch tube->Is a second terminal of (2) and a power switch tube->Is connected to the first terminal of (2) and forms an output port with ground +.>。
Capacitance deviceIs a first terminal of (2) and power switch tube->Is a power switch tube>Is connected to the second end of the first connector. Capacitance->Is a second terminal of (2) and a power switch tube->Is a power switch tube>Is connected to the first end of the housing. Power switch tubeIs>Is connected to the first end of the housing. Power switch tube->Is a second terminal and a capacitance->Is connected to the second end of the first connector. Power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the positive end of the connecting rod. Power switch tube->Is connected with the second terminal of the direct current power supply +.>Is connected with the negative terminal of the battery.
As a specific embodiment, a common-mode switched-capacitor multi-level inverter has a plurality of output voltages. A common-ground switched capacitor multi-level inverter has two different modes of operation for each output voltage. The output voltage is used for high-frequency switching between two working modes during output.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims (10)

1. A common-ground switched capacitor multi-level inverter, comprising: a base unit, an auxiliary branch and an expandable unit;
the base unit includes: DC power supplyPower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->；
The auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Power switch tube->Auxiliary capacitor->；
The expandable unit includes: power switch tubePower switch tube->Power switch tube->Power switch tubePower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->Capacitance->；
The power switch tube Form an upper access port of the expandable unit; the power switch tube->A second end of the expandable unit constitutes a lower access port of the expandable unit; the power switch tube->Is connected to the first end of the power switch tube>Is the second terminal of the power switch tube +.>Is connected to the second end of the first member; the power switch tube->Is connected to the second terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; said capacitor->Is connected to the first end of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; said capacitor->Is connected to the second terminal of the power switch tube>Is the second terminal of the power switch tube +.>Is connected to the second end of the first member; the power switch tube->Is connected to the first end of the power switch tube>Is the second terminal of the power switch tube +.>Is connected to the second end of the first member; the power switch tube->Is connected to the second terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; said capacitor->Is connected to the first end of the power switch tube>Is connected with the first end of the expandable unit and forms an upper output port of the expandable unit; said capacitor->Is connected to the second terminal of the power switch tube >The second ends of the expandable units are connected and form a lower output port of the expandable units;
the direct current power supplyIs connected with the positive terminal of the power switch tube>Is connected to the first end of the housing; the direct current power supply->Is connected to the negative terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member; the direct current power supply->Is grounded; said capacitor->Is connected to the first end of the power switch tube>Is the second terminal of the power switch tube +.>The first end of the expandable unit is connected with an upper access port of the expandable unit; said capacitor->Is connected to the second terminal of the power switch tube>The second end of the expandable unit is connected with the lower access port of the expandable unit; the power switch tube->Is connected with the upper outlet port of the expandable unit; the power switch tube->The second end of the expandable unit is connected with the lower output port of the expandable unit; the power switch tube->Is connected to the second terminal of the power switch tube>Is connected to the first terminal of (2) and forms an output port with ground +.>；
The capacitorIs connected to the first end of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member; said capacitor->Is connected to the second terminal of the power switch tube >Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; the power switch tube->Is +.>Is connected to the first end of the housing; the power switch tube->Is connected to the second terminal of (c) and the capacitor +.>Is connected to the second end of the first member; the power switch tube->Is connected to the second terminal of the DC power supply +.>Is connected with the positive end of the connecting rod; the power switch tube->Is connected to the second terminal of the DC power supply +.>Is connected with the negative terminal of the battery.
2. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the power switch tubeThe power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>The power switch tube>Is a unidirectional voltage-resistant full-control power switch device;
the power switch tubeThe power switch tube>The power switch tube>The power switch tube>Is a bidirectional voltage-resistant fully-controlled power switch device.
3. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
and the control is performed by adopting a latest level approximation modulation mode or a sinusoidal pulse width modulation mode.
4. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor multi-level inverter has a zero-level voltage output state with zero output voltage;
in the zero-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、And->Conducting; the power switch tube->、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->、/>、/>And->Charging; in another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、、/>、/>、/>、/>And->Conducting; power switch tube->、/>、/>、/>、/>And->Disconnecting; the direct current power supplyTo the capacitor->、/>、/>And->And (5) charging.
5. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor multi-level inverter has a level voltage output state with output voltage being a power supply voltage value;
In the one-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction, the power switch tube is->、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->、/>、/>And->Charging, the direct current power supply is->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another working mode, the power switch tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conduction, the power switch tube is->、/>、/>、、/>And->Disconnecting; the direct current power supply->To the capacitor->、/>、/>And->Charging, the direct current power supply is->Discharging to load->。
6. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor multi-level inverter has a two-level voltage output state that the output voltage is twice the power supply voltage value;
in the two-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->And->Charging; said capacitor->、/>Parallel connection and the direct current power supply +. >Discharging in series to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->Charging; said capacitor->By the capacitance->After charging and said direct current power supply->Discharging in series to load->。
7. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor multi-level inverter has a three-level voltage output state that the output voltage is three times the power supply voltage value;
in the three-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To said capacitorAnd->Charging; said capacitor->And->And the direct current power supply +.>Discharging in series to load->In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->Charging; said capacitor->By the capacitance->After charging and said capacitance->The direct current power supply +. >Discharging in series to load->。
8. A common-mode switched-capacitor multilevel inverter as claimed in claim 1, wherein,
the common-ground type switch capacitor multi-level inverter has a negative one-level voltage output state with a negative power supply voltage value;
in the negative one-level voltage output state, the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>、/>、/>Andconducting; the power switch tube->、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To said capacitor、/>And->Charging; said capacitor->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、And->Disconnecting; the direct current power supply->To the capacitor->、/>And->Charging; said capacitor->Discharging to load->；
The common-ground type switch capacitor multi-level inverter has a negative two-level voltage output state with the output voltage being twice the power supply voltage value;
in the negative two-level voltage output state, the common-ground type switch capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube 、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To the capacitor->Charging; said capacitor->And->Parallel connection and said capacitance->Discharging to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、/>、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、、/>、/>、/>、/>And->Disconnecting; said capacitor->By the capacitance->After charging and said capacitance->Discharging in series to load->；
The common-ground type switch capacitor multi-level inverter has a negative three-level voltage output state with an output voltage of three times the negative power supply voltage value;
at the negative three levelThe voltage output state is that the common-ground type switched capacitor multi-level inverter has two working modes; in one mode of operation, the power switching tube、/>、/>、/>、/>、/>、/>、/>、/>And->Conducting; the power switch tube->、/>、/>、/>、/>、/>、/>、/>And->Disconnecting; the direct current power supply->To said capacitorCharging, the capacitance->、/>And->Discharging in series to load->The method comprises the steps of carrying out a first treatment on the surface of the In another mode of operation, the power switch tube is +.>、、/>、/>、/>、/>、/>、/>、/>And->Conduction and power switch tube->、/>、/>、/>、/>、/>、/>、/>And->Disconnecting; said capacitor->By the capacitance->After charging and said capacitance->、/>Discharging in series to load->。
9. A common-ground switched capacitor multi-level inverter, comprising: a base unit, an auxiliary branch and an expandable unit;
The expandable unit comprises a plurality of expansion basic units; the expansion foundation units are sequentially connected in series; the extension base unit includes: the power supply comprises an upper first power switch tube, an upper second power switch tube, a lower first power switch tube, a lower second power switch tube, a middle power switch tube and a unit capacitor;
the first end of the upper first power switch tube forms an upper access port of the expansion base unit; the second end of the lower first power switch tube forms a lower access port of the expansion base unit; the first end of the middle power switch tube is connected with the second end of the upper first power switch tube and the second end of the upper second power switch tube; the second end of the middle power switch tube is connected with the first end of the lower first power switch tube and the first end of the lower second power switch tube; the first end of the unit capacitor is connected with the first end of the upper second power switch tube and forms an upper output port of the expansion base unit; the second end of the unit capacitor is connected with the second end of the lower second power switch tube and forms a lower output port of the expansion base unit;
the upper access port and the lower access port of the first expansion base unit in series connection respectively form an upper access port and a lower access port of the expandable unit; the upper outlet port and the lower outlet port of the last expansion base unit in series connection respectively form an upper outlet port and a lower outlet port of the expandable unit;
The base unit includes: DC power supplyPower switch tube->Power switch tube->Power switch tube->Power switch tube->Power switch tube->Capacitance->；
The auxiliary branch comprises: power switch tubePower switch tube->Power switch tube->Power switch tube->Auxiliary capacitor->；
The direct current power supplyIs connected with the positive terminal of the power switch tube>Is connected to the first end of the housing; the direct current power supply->Is connected to the negative terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member; the direct current power supply->Is grounded; said capacitor->Is connected to the first end of the power switch tube>Is the second terminal of the power switch tube +.>The first end of the expandable unit is connected with an upper access port of the expandable unit; said capacitor->Is connected to the second terminal of the power switch tube>The second end of the expandable unit is connected with the lower access port of the expandable unit; the power switch tube->Is connected with the upper outlet port of the expandable unit; the power switch tube->The second end of the expandable unit is connected with the lower output port of the expandable unit; the power switch tube->Is connected to the second terminal of the power switch tube>Is connected to the first end of the ground to form an output port ；
The capacitorIs connected to the first end of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the second end of the first member; said capacitor->Is connected to the second terminal of the power switch tube>Is a first terminal of the power switch tube +.>Is connected to the first end of the housing; the power switch tube->Is +.>Is connected to the first end of the housing; the power switch tube->Is connected to the second terminal of (c) and the capacitor +.>Is connected to the second end of the first member; the power switch tube->Is connected to the second terminal of the DC power supply +.>Is connected with the positive end of the connecting rod; the power switch tube->Is connected to the second terminal of the DC power supply +.>Is connected with the negative terminal of the battery.
10. A common-mode switched-capacitor multilevel inverter as claimed in claim 9, wherein,
the common-ground type switch capacitor multi-level inverter is provided with a plurality of output voltages; the common-ground type switch capacitor multi-level inverter has two different working modes for each output voltage; the output voltage is used for high-frequency switching between two working modes during output.
CN202311815217.3A 2023-12-27 2023-12-27 Common-ground type switch capacitor multi-level inverter Withdrawn CN117477975A (en)

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CN113783449A (en) * 2021-09-03 2021-12-10 南京理工大学 Common-ground type double-output switch capacitance type multi-level inverter
CN116317648A (en) * 2023-03-28 2023-06-23 南京理工大学 Expandable common-ground type switch capacitor multi-level inverter
CN116647119A (en) * 2023-03-28 2023-08-25 南京理工大学 Common-ground type switched capacitor inverter with continuous input current and control method thereof

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Publication number Priority date Publication date Assignee Title
CN113783449A (en) * 2021-09-03 2021-12-10 南京理工大学 Common-ground type double-output switch capacitance type multi-level inverter
CN116317648A (en) * 2023-03-28 2023-06-23 南京理工大学 Expandable common-ground type switch capacitor multi-level inverter
CN116647119A (en) * 2023-03-28 2023-08-25 南京理工大学 Common-ground type switched capacitor inverter with continuous input current and control method thereof

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Title
JIANDONG ZHANG，ET AL.: "A COMMON GROUND (CG) SWITCHED CAPACITOR MULTILEVEL INVERTER (SCMLI) WITH AN ADDITIONAL CHARGE PUMP CELL FITTED FOR PHOTOVOLTAICS - SUPPLIED ENERGY SYSTEMS", 2023 25TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE\'23 ECCE EUROPE), 2 October 2023 (2023-10-02), pages 1 - 8 *

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