CN112564529B - Boost seven-level inverter - Google Patents
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- CN112564529B CN112564529B CN202011429202.XA CN202011429202A CN112564529B CN 112564529 B CN112564529 B CN 112564529B CN 202011429202 A CN202011429202 A CN 202011429202A CN 112564529 B CN112564529 B CN 112564529B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- 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
Abstract
The invention provides a boost seven-level inverter, which comprises a direct current input module, a first topology module and a second topology moduleA topology module; the direct current input module comprises a direct current power supply and a capacitor C 1 And capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the The first topology module includes a diode D 1 Diode D 2 Switch tube S 1 Switch tube S 2 Switch tube S 3 And a switch tube S 4 The method comprises the steps of carrying out a first treatment on the surface of the The second topology module includes a diode D 3 Diode D 4 Capacitance C 3 Capacitance C 4 Switch tube S 5 Switch tube S 6 And a switch tube S 7 . The invention provides a boost seven-level inverter, which can realize seven different-level alternating current outputs by only seven switching tubes, four capacitors and four diodes, has a simple circuit structure and low cost, and solves the problems that the existing inverter circuit is complex in structure and needs more electronic devices.
Description
Technical Field
The invention relates to the technical field of power conversion, in particular to a boost seven-level inverter.
Background
At present, new energy power generation is developed at home and abroad, but under the general condition, the direct current output by the new energy power generation device is unstable and cannot be directly supplied to users needing the alternating current. Thus, inversion techniques employing DC-AC conversion are required to convert direct current to alternating current, which may be incorporated into the utility grid if desired. The multilevel inverter has the advantages of low output voltage harmonic content, low switching tube voltage stress, low switching loss, low electromagnetic interference and the like, and is widely applied to new energy power generation. The traditional multilevel inverter comprises an inverter circuit such as a diode clamping type, a flying capacitor type, a cascade H bridge and the like. However, as the number of output levels increases, the current inverter circuit structure is complex and requires more electronic devices, increasing the system cost and complexity of system control.
In the prior art, as disclosed in China patent publication No. CN106849719A, seven-level inverter and seven-level inversion topological structure of 2017, 6 and 13, electronic devices required by an inverter circuit are reduced, but the circuit structure is still relatively complex.
Disclosure of Invention
The invention provides a boost seven-level inverter, which aims to overcome the technical defects that the existing inverter circuit is complex in structure and needs more electronic devices.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a boost seven-level inverter comprises a direct current input module, a first topology module and a second topology module; the direct current input module is electrically connected with the first topological module, and the first topological module is electrically connected with the second topological module;
the direct current input module comprises a direct current power supply and a capacitor C 1 And capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the Positive pole of the direct current power supply and capacitor C 1 Is electrically connected with one end of the capacitor C and the negative electrode of the direct current power supply 2 Is electrically connected with one end of the capacitor C 1 And the other end of (C) and the capacitor C 2 Is connected to the other end of the seven-level inverter and serves as a neutral point of the seven-level inverter;
the first topology module includes a diode D 1 Diode D 2 Switch tube S 1 Switch tube S 2 Switch tube S 3 And a switch tube S 4 The method comprises the steps of carrying out a first treatment on the surface of the The switch tube S 1 Is electrically connected with the positive pole of the DC power supply, the switch tube S 1 Respectively with diode D 1 Is a cathode of the switch tube S 2 Is electrically connected with one end of the switch tube S 2 And the other end of the switch tube S 3 Is electrically connected with one end of the switch tube S 3 Respectively with diode D 2 Positive electrode of (a) switching tube S 4 Is electrically connected with one end of the switch tube S 4 The other end of the diode D is electrically connected with the negative electrode of the direct current power supply 1 Positive electrode of (D) diode D 2 The negative electrodes of the electrodes are connected with neutral points;
the second topology module includes a diode D 3 Diode D 4 Capacitance C 3 Capacitance C 4 Switch tube S 5 Switch tube S 6 And a switch tube S 7 The method comprises the steps of carrying out a first treatment on the surface of the The diode D 3 Is electrically connected with one end of the first topological module, and the diode D 3 Respectively with the negative electrode of the capacitor C 3 One end of (S) a switching tube 5 Is electrically connected with one end of the diode D 4 Is electrically connected with the other end of the first topological moduleIs connected with the diode D 4 Positive electrode of (C) and capacitor C respectively 4 One end of (S) a switching tube 6 Is electrically connected with one end of the capacitor C 3 The other end of (C) and the capacitance C 4 And the other end of the switch tube S 7 One end of (a) is connected with the switch tube S 2 Is electrically connected with the other end of the connecting rod; switch tube S 5 Is provided with a switch tube S 6 And the other end of the switch tube S 7 The other ends of the two terminals are all used as alternating current output terminals.
Preferably, the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with the other end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to one end of the first connector.
Preferably, the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with one end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to the other end of the first circuit board.
Preferably, the switching tube S 7 Is a bidirectional switch tube.
Preferably, the switching tube S 7 Consists of two IGBTs (Insulated Gate Bipolar Transistor, insulated gate bipolar transistors) connected in series in opposite directions.
Preferably, the switching tube S 7 Consists of two MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistor) in anti-series connection.
Preferably, the switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 5 And a switch tube S 6 Are IGBTs.
Preferably, the switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 5 And a switch tube S 6 Are MOSFETs.
Preferably, the IGBT or MOSFET is connected in reverse parallel with a diode.
Preferably, the capacitor C 1 And capacitor C 2 The model of the capacitor C is the same 3 And capacitor C 4 Model of (2)The same applies.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
the invention provides a boost type seven-level inverter, which can realize seven different-level alternating current outputs by only seven switching tubes, four capacitors and four diodes, and has simple circuit structure and lower cost.
Drawings
FIG. 1 is a schematic diagram of a circuit connection according to one embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit for converting the voltage 2E of a DC power supply into +3E level AC power for output according to one embodiment of the present invention;
FIG. 3 is a schematic diagram of a circuit for converting the voltage 2E of a DC power supply into +2E level AC power for output according to one embodiment of the present invention;
FIG. 4 is a schematic diagram showing a circuit operating state of converting the voltage 2E of the DC power supply into +E level AC output according to one embodiment of the present invention;
FIG. 5 is a schematic diagram showing another circuit operating state of converting the voltage 2E of the DC power supply into +E level AC output according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of a circuit for converting the voltage 2E of the DC power supply into 0 level AC output according to one embodiment of the present invention;
FIG. 7 is a schematic diagram showing an operation state of a circuit for converting the voltage 2E of the DC power supply into an-E level AC output according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of another circuit operating state for converting the voltage 2E of the DC power supply to an-E level AC output according to one embodiment of the present invention;
FIG. 9 is a schematic diagram of a circuit for converting the voltage 2E of a DC power supply into an AC output of-2E level according to one embodiment of the present invention;
FIG. 10 is a schematic diagram of a circuit for converting the voltage 2E of a DC power supply into an AC output of-3E level according to one embodiment of the present invention;
FIG. 11 is a schematic diagram showing simulation results of output voltages according to one embodiment of the present invention;
FIG. 12 is a schematic diagram of a circuit connection according to another embodiment of the present invention;
FIG. 13 is a schematic diagram showing the operation of a circuit for converting the voltage 2E of a DC power supply into +3E level AC power output according to another embodiment of the present invention;
FIG. 14 is a schematic diagram showing the operation of a circuit for converting the voltage 2E of a DC power supply into +2E level AC power output according to another embodiment of the present invention;
FIG. 15 is a schematic diagram showing an operation state of a circuit for converting the voltage 2E of the DC power supply into +E level AC output according to another embodiment of the present invention;
FIG. 16 is a schematic diagram showing another circuit operating state of converting the voltage 2E of the DC power supply into +E level AC output according to another embodiment of the present invention;
FIG. 17 is a schematic diagram showing the operation of a circuit for converting the voltage 2E of the DC power supply into 0 level AC output according to another embodiment of the present invention;
FIG. 18 is a schematic diagram showing an operation state of a circuit for converting the voltage 2E of the DC power supply into an-E level AC output according to another embodiment of the present invention;
FIG. 19 is a schematic diagram showing another circuit operation state of converting the voltage 2E of the DC power supply into an-E level AC output according to another embodiment of the present invention;
FIG. 20 is a schematic diagram showing the operation of a circuit for converting the voltage 2E of a DC power supply into an AC output of-2E level according to another embodiment of the present invention;
FIG. 21 is a schematic diagram of the circuit for converting the voltage 2E of the DC power supply into an AC output of-3E level according to another embodiment of the present invention;
FIG. 22 is a schematic diagram of simulation results of output voltages according to another embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
A boost seven-level inverter comprises a direct current input module, a first topology module and a second topology module; the direct current input module is electrically connected with the first topological module, and the first topological module is electrically connected with the second topological module;
the direct current input module comprises a direct current power supply and a capacitor C 1 And capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the Positive pole of the direct current power supply and capacitor C 1 Is electrically connected with one end of the capacitor C and the negative electrode of the direct current power supply 2 Is electrically connected with one end of the capacitor C 1 And the other end of (C) and the capacitor C 2 Is connected to the other end of the seven-level inverter and serves as a neutral point of the seven-level inverter;
the first topology module includes a diode D 1 Diode D 2 Switch tube S 1 Switch tube S 2 Switch tube S 3 And a switch tube S 4 The method comprises the steps of carrying out a first treatment on the surface of the The switch tube S 1 Is electrically connected with the positive pole of the DC power supply, the switch tube S 1 Respectively with diode D 1 Is a cathode of the switch tube S 2 Is electrically connected with one end of the switch tube S 2 And the other end of the switch tube S 3 Is electrically connected with one end of the switch tube S 3 Respectively with diode D 2 Positive electrode of (a) switching tube S 4 Is electrically connected with one end of the switch tube S 4 The other end of the diode D is electrically connected with the negative electrode of the direct current power supply 1 Positive electrode of (D) diode D 2 The negative electrodes of the electrodes are connected with neutral points;
the second topology module includes a diode D 3 Diode D 4 Capacitance C 3 Capacitance C 4 Switch tube S 5 Switch tube S 6 And a switch tube S 7 The method comprises the steps of carrying out a first treatment on the surface of the The diode D 3 Is electrically connected with one end of the first topological module, and the diode D 3 Respectively with the negative electrode of the capacitor C 3 One end of (S) a switching tube 5 Is electrically connected with one end of the diode D 4 Is electrically connected with the other end of the first topological module, and the diode D 4 Positive electrode of (C) and capacitor C respectively 4 One end of (S) a switching tube 6 Is electrically connected with one end of the capacitor C 3 The other end of (C) and the capacitance C 4 And the other end of the switch tube S 7 One end of (a) is connected with the switch tube S 2 Is electrically connected with the other end of the connecting rod; switch tube S 5 Is provided with a switch tube S 6 And the other end of the switch tube S 7 The other ends of the two terminals are all used as alternating current output terminals.
More specifically, as shown in FIG. 1, the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with the other end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to one end of the first connector.
In the implementation process, for the seven-level inverter shown in fig. 1, assuming that the voltage of the dc power supply is 2E, when the switching tube S 1 、S 3 And S is 4 Turned on to S 2 When the switch is turned off, the direct current power supply passes through the switch tube S 1 、S 3 、S 4 Diode D 3 To capacitor C 3 Charging (charging loop: DC power supply-S) 1 -D 3 -C 3 -S 3 -S 4 -direct current power supply), such that C 3 Is equal to the voltage 2E of the input dc power supply; when the switch tube S 1 、S 2 And S is 4 Turned on to S 3 When the switch is turned off, the direct-current voltage passes through the switch tube S 1 、S 2 、S 4 Diode D 4 To capacitor C 4 Charging (charging loop: DC power supply-S) 1 -S 2 -C 4 -D 4 -S 4 -direct current power supply), such that C 4 Is equal to the voltage 2E of the input dc power supply. It can be seen that the capacitance C 3 And C 4 The voltage of (2) may automatically stabilize at 2E. Capacitor C 1 And C 2 Is a voltage dividing capacitor. The voltage 2E of a direct-current voltage source can be converted into alternating-current power output with 7 different levels, namely 0, +/-E, +/-2E and+/-3E, by controlling the orderly on-off of 7 switching tubes in the circuit.
As shown in FIG. 2, when the switching tube S 1 、S 2 、S 4 And S is 5 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into +3E level alternating current to be output; u (u) o For AC voltage output, i o Is a current;
as shown in FIG. 3, when the switching tube S 2 、S 3 And S is 5 When the other switching tubes are turned off and turned on, the voltage 2E of the DC power supply can be converted into the AC power output u of +2E level o ；
As shown in FIG. 4, when the switching tube S 1 、S 3 、S 4 And S is 5 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current with +E level for output;
as shown in FIG. 5, when the switching tube S 1 、S 2 、S 4 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current with +E level for output;
as shown in FIG. 6, when the switching tube S 2 、S 3 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into 0-level alternating current output;
as shown in FIG. 7, when the switching tube S 1 、S 3 、S 4 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current of-E level to be output;
as shown in FIG. 8, when the switching tube S 1 、S 2 、S 4 And S is 6 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current of-E level to be output;
as shown in FIG. 9, when the switching tube S 2 、S 3 And S is 6 When the other switching tubes are turned off and turned on at the same time, the switch tube can be turned on directlyThe voltage 2E of the current power supply is converted into alternating current output of-2E level;
as shown in FIG. 10, when the switching tube S 1 、S 3 、S 4 And S is 6 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into the alternating current of-3E level to be output;
the detailed switching logic is shown in table 1, where 1 and 0 correspond to on and off of the switching tube, respectively, and C, D and N correspond to the charging, discharging and idle states of the capacitor, respectively.
Table 1 is the switching logic and output level of the seven-level inverter in example 1.
TABLE 1
And building a simulation model of the seven-level inverter in the embodiment in Matlab/Simulink. The parameters of the simulation model are as follows: dc power supply voltage 2e=200v, capacitor C 1 、C 2 、C 3 And C 4 The size of (2) mF, and the load resistance R is 100 omega; the switch control adopts multi-carrier SPWM modulation in which carrier phase shifting and carrier lamination are mixed, the frequency of modulation wave is 10kHz, the frequency of carrier wave is 50Hz, and the modulation ratio is 0.98. The simulated waveform of the output voltage is shown in fig. 11. Simulation results prove that the seven-level inverter can output alternating current with 7 different levels, and the amplitude of the output voltage is 1.5 times of that of the output voltage, so that the seven-level inverter has voltage boosting capability.
Example 2
More specifically, as shown in FIG. 12, the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with one end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to the other end of the first circuit board.
In the implementation process, for the seven-level inverter shown in fig. 12, assuming that the voltage of the dc power supply is 2E, when the switching tube S 3 And S is 4 Conduct and S 1 And S is 2 When the switch is turned off, the DC power supplyThrough diode D 3 Is a capacitor C 3 Charging to make C 3 Is equal to the input voltage 2E; when the switch tube S 1 And S is 2 Conduct and S 3 And S is 4 When the power is turned off, the direct current power supply passes through the diode D 4 Is a capacitor C 4 Charging to make C 4 Is equal to the input voltage 2E. It can be seen that the capacitance C 3 And C 4 The voltage of (2) may automatically stabilize at 2E. Capacitor C 1 And C 2 Is a voltage dividing capacitor with a voltage equal to E. The voltage 2E of a direct-current voltage source can be converted into alternating-current power output with 7 different levels, namely 0, +/-E, +/-2E and+/-3E, by controlling the orderly on-off of 7 switching tubes in the circuit.
As shown in FIG. 13, when the switching tube S 1 、S 2 And S is 5 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into +3E level alternating current to be output;
as shown in FIG. 14, when the switching tube S 2 、S 3 And S is 5 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into +2E level alternating current to be output;
as shown in FIG. 15, when the switching tube S 1 、S 2 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current with +E level for output;
as shown in FIG. 16, when the switching tube S 3 、S 4 And S is 5 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current with +E level for output;
as shown in FIG. 17, when the switching tube S 2 、S 3 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into 0-level alternating current output;
as shown in FIG. 18, when the switching tube S 1 、S 2 And S is 6 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current of-E level to be output;
as shown in FIG. 19, when the switching tube S 3 、S 4 And S is 7 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into alternating current of-E level to be output;
as shown in FIG. 20, when the switching tube S 2 、S 3 And S is 6 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into the alternating current of-2E level to be output;
as shown in FIG. 21, when the switching tube S 3 、S 4 And S is 6 When the other switching tubes are turned off, the voltage 2E of the direct current power supply can be converted into the alternating current of-3E level to be output;
the detailed switching logic is shown in table 2, where 1 and 0 correspond to on and off of the switching tube, respectively, and C, D and N correspond to the charging, discharging and idle states of the capacitor, respectively.
Table 2 is the switching logic and output level of the seven-level inverter in example 2.
TABLE 2
And building a simulation model of the seven-level inverter in the embodiment in Matlab/Simulink. The parameters of the simulation model are as follows: dc power supply voltage 2e=200v, capacitor C 1 、C 2 、C 3 And C 4 The magnitude of (2) is 4mF, the load resistance R is 50Ω, the carrier frequency modulated by SWPM is 3kHZ, and the modulation wave frequency is 50HZ. The simulated waveform of the output voltage is shown in fig. 22. Simulation results prove that the seven-level inverter can output alternating current with 7 different levels, and the amplitude of the output voltage is 1.5 times of that of the output voltage, so that the seven-level inverter has voltage boosting capability.
More specifically, the switching tube S 7 Is a bidirectional switch tube.
More specifically, the switching tube S 7 Consists of two IGBTs or two MOSFETs which are connected in reverse series.
More specifically, the switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 5 And a switch tube S 6 Are IGBTs or MOSFETs.
More specifically, the IGBT or MOSFET is connected in reverse parallel with a diode.
More specifically, the capacitor C 1 And capacitor C 2 The model of the capacitor C is the same 3 And capacitor C 4 Is the same as the model number of the model number.
In the specific implementation process, the capacitor C 1 And C 2 For dividing the input DC voltage into halves, capacitor C 3 And C 4 For inputting the magnitude of the dc voltage. It can be seen from both tables 1 and 2 that each capacitor is charged multiple times during one input voltage period, so that their voltages are automatically balanced.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
1. The boost seven-level inverter is characterized by comprising a direct current input module, a first topology module and a second topology module; the direct current input module is electrically connected with the first topological module, and the first topological module is electrically connected with the second topological module;
the direct current input module comprises a direct current power supply and a capacitor C 1 And capacitor C 2 The method comprises the steps of carrying out a first treatment on the surface of the Positive pole of the direct current power supply and capacitor C 1 Is electrically connected with one end of the capacitor C and the negative electrode of the direct current power supply 2 Is electrically connected with one end of the capacitor C 1 And the other end of (C) and the capacitor C 2 Is connected to the other end of the seven-level inverter and serves as a neutral point of the seven-level inverter;
the saidThe first topology module includes a diode D 1 Diode D 2 Switch tube S 1 Switch tube S 2 Switch tube S 3 And a switch tube S 4 The method comprises the steps of carrying out a first treatment on the surface of the The switch tube S 1 Is electrically connected with the positive pole of the DC power supply, the switch tube S 1 Respectively with diode D 1 Is a cathode of the switch tube S 2 Is electrically connected with one end of the switch tube S 2 And the other end of the switch tube S 3 Is electrically connected with one end of the switch tube S 3 Respectively with diode D 2 Positive electrode of (a) switching tube S 4 Is electrically connected with one end of the switch tube S 4 The other end of the diode D is electrically connected with the negative electrode of the direct current power supply 1 Positive electrode of (D) diode D 2 The negative electrodes of the electrodes are connected with neutral points;
the second topology module includes a diode D 3 Diode D 4 Capacitance C 3 Capacitance C 4 Switch tube S 5 Switch tube S 6 And a switch tube S 7 The method comprises the steps of carrying out a first treatment on the surface of the The diode D 3 Is electrically connected with one end of the first topological module, and the diode D 3 Respectively with the negative electrode of the capacitor C 3 One end of (S) a switching tube 5 Is electrically connected with one end of the diode D 4 Is electrically connected with the other end of the first topological module, and the diode D 4 Positive electrode of (C) and capacitor C respectively 4 One end of (S) a switching tube 6 Is electrically connected with one end of the capacitor C 3 The other end of (C) and the capacitance C 4 And the other end of the switch tube S 7 One end of (a) is connected with the switch tube S 2 Is electrically connected with the other end of the connecting rod; switch tube S 5 Is provided with a switch tube S 6 And the other end of the switch tube S 7 The other ends of the two terminals are all used as alternating current output terminals.
2. The boost seven level inverter of claim 1, wherein the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with the other end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to one end of the first connector.
3. The boost seven level inverter of claim 1, wherein the diode D 3 Positive electrode of (d) and switching tube S 1 Is electrically connected with one end of the diode D 4 Is connected with the negative pole of the switch tube S 4 Is electrically connected to the other end of the first circuit board.
4. The boost seven-level inverter of claim 1, wherein the switching tube S 7 Is a bidirectional switch tube.
5. The boost seven level inverter of claim 4, wherein the switching tube S 7 The IGBT is formed by reversely connecting two IGBTs in series, and a diode is reversely connected in parallel with the IGBTs.
6. The boost seven level inverter of claim 4, wherein the switching tube S 7 Consists of two MOSFETs which are connected in reverse series and are connected in reverse parallel with a diode.
7. The boost seven-level inverter of claim 1, wherein the switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 5 And a switch tube S 6 The two transistors are all IGBTs, and the IGBTs are reversely connected with a diode in parallel.
8. The boost seven-level inverter of claim 1, wherein the switching tube S 1 Switch tube S 2 Switch tube S 3 Switch tube S 4 Switch tube S 5 And a switch tube S 6 Are MOSFETs, and a diode is reversely connected in parallel with the MOSFETs.
9. A boost seven level inverter according to claim 1, wherein the capacitor C 1 And capacitor C 2 The model of the capacitor C is the same 3 And capacitor C 4 Is the same as the model number of the model number.
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| CN102638191A (en) * | 2012-04-13 | 2012-08-15 | 阳光电源股份有限公司 | Seven-level inversion topology unit and seven-level inverter |
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| CN109039123A (en) * | 2018-05-25 | 2018-12-18 | 西安理工大学 | A kind of seven electrical level inverter of booster type |
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| CN102638191A (en) * | 2012-04-13 | 2012-08-15 | 阳光电源股份有限公司 | Seven-level inversion topology unit and seven-level inverter |
| CN102647102A (en) * | 2012-04-13 | 2012-08-22 | 阳光电源股份有限公司 | Seven-level inversion topological unit and seven-level inverter |
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| CN109474196A (en) * | 2017-09-07 | 2019-03-15 | 北京德意新能电气有限公司 | Seven level inverse conversion topological structures of one kind and seven electrical level inverters |
| CN108683347A (en) * | 2018-04-17 | 2018-10-19 | 西安工业大学 | The seven electrical level inverter topological structures based on voltage-multiplying circuit and seven electrical level inverters |
| CN108616224A (en) * | 2018-05-25 | 2018-10-02 | 西安理工大学 | A kind of single-phase seven electrical level inverter of booster type |
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