CN114900029A - Single-phase single-stage coupling inductance type split source boost inverter and method thereof - Google Patents
Single-phase single-stage coupling inductance type split source boost inverter and method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/539—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency
- H02M7/5395—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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Abstract
The invention discloses a single-phase single-stage coupling inductance type split source boost inverter and a method thereof, wherein the boost inverter comprises a boost circuit, a bridge arm direct connection prevention circuit and an output circuit; the booster circuit comprises a first winding, a second winding, a third winding, a fourth winding, a fifth winding, a sixth diode, a sixth MOS tube, a sixth tube, a fourth tube, a sixth tube, a fourth tube, a; the bridge arm through-connection preventing circuit comprises fourth to seventh diodes and first to fourth inductors; the output circuit comprises a fifth inductor, a second capacitor and an output resistor; the first to third windings form a delta connection type coupled inductor. The invention has simple structure and continuous power supply input current, can realize higher voltage gain by adopting the coupling inductors in triangular connection, and can effectively inhibit the voltage peak of an active device. The load current is continuous, the inverter bridge arm adopts a double-BUCK type circuit structure, the bridge arm direct connection risk can be effectively avoided, and the circuit does not have starting impact current and impact current at the moment of switching-on of the switching tube.
Description
Technical Field
The invention relates to the technical field of power electronic circuits, in particular to a single-phase single-stage coupling inductance type split-source boost inverter and a method thereof.
Background
The large consumption of traditional fossil energy such as coal, petroleum and natural gas and the increasingly serious environmental pollution problem caused by the consumption of the traditional fossil energy, various green renewable energy such as wind energy, solar energy, tidal energy, fuel cells and the like are concerned, and the accumulated installed capacity of wind power generation and solar power generation in China stably stays at the top of the world. However, the voltage level generated by such green renewable energy sources as solar energy and wind energy is low, and the conventional voltage-type full-bridge inverter is a step-down inverter, so the output voltage of the green renewable energy power generation system must be boosted to a high voltage level by a high-gain DC-DC converter, and then inverted by an inverter to generate alternating current for use.
In recent years, related researchers have proposed BOOST inverters such as a cascade BOOST inverter, a Z-source inverter, a quasi-Z-source inverter, a switching BOOST inverter, and a quasi-switching BOOST inverter, but they use many active devices and passive devices, so that the overall size, weight, and cost of the converter are greatly increased; secondly, a switch bridge arm of the cascade BOOST inverter needs to be provided with a certain dead time to prevent the switch tube from being damaged due to direct connection of the non-return variable bridge arm; finally, the voltage gain corresponding to the boost inverters still has a large boost space. Therefore, the inverter design with high system reliability and high voltage gain is a key technology in line with the development direction of power electronic technology, while the number of passive devices is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of providing a single-phase single-stage coupling inductance type split source boost inverter and a method thereof aiming at the defects involved in the background technology.
The invention adopts the following technical scheme for solving the technical problems:
a single-phase single-stage coupling inductance type split-source boost inverter comprises first to third windings, first to second capacitors, first to seventh diodes, first to fourth MOS (metal oxide semiconductor) tubes, an output resistor and first to fifth inductors, wherein the first to third windings are connected with the first to second capacitors;
the first winding, the second winding and the third winding form a triangular connection type coupling inductor, and the positive electrode of the second winding is respectively connected with the positive electrode of the third winding and the positive electrode of an input voltage source; the negative electrode of the second winding is respectively connected with the negative electrode of the first winding and the positive electrode of the first diode; the anode of the first winding is connected with the cathode of the third winding, the anode of the second diode and the anode of the third diode respectively;
the cathode of the first diode is respectively connected with the anode of the first capacitor, the drain electrode of the first MOS tube, the cathode of the fourth diode, the drain electrode of the third MOS tube and the cathode of the sixth diode;
the cathode of the first capacitor is respectively connected with the cathode of the input voltage source, the anode of the fifth diode, the source electrode of the second MOS tube, the anode of the seventh diode and the source electrode of the fourth MOS tube;
the source electrode of the first MOS tube is respectively connected with one end of the first inductor and the negative electrode of the fifth diode;
the anode of the fourth diode is respectively connected with the cathode of the second diode, one end of the second inductor and the drain of the second MOS tube;
the source electrode of the third MOS tube is respectively connected with one end of a third inductor and the negative electrode of a seventh diode;
the anode of the sixth diode is respectively connected with the cathode of the third diode, one end of the fourth inductor and the drain of the fourth MOS tube;
one end of the fifth inductor is connected with the other end of the first inductor and the other end of the second inductor respectively, and the other end of the fifth inductor is connected with the anode of the second capacitor and one end of the output resistor respectively;
the negative electrode of the second capacitor is respectively connected with the other end of the fourth inductor, the other end of the output resistor and the other end of the third inductor;
and one end of the fifth inductor, which is connected with the first inductor, is used as one output end a of the single-phase single-stage coupling inductor type split source boost inverter, and one end of the output resistor, which is connected with the third inductor, is used as the other output end b of the single-phase single-stage coupling inductor type split source boost inverter.
The invention also discloses a working method of the single-phase single-stage coupling inductor type split-source boost inverter, the triangular connection type coupling inductor is in a charging state, and the boost inverter works in the following four modes:
the first mode is as follows: the second MOS tube, the third MOS tube, the first diode, the second diode, the fifth diode and the sixth diode are turned off, the first MOS tube, the fourth MOS tube, the third diode, the fourth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage;
mode two: the first MOS tube, the fourth MOS tube, the first diode, the third diode, the fourth diode and the seventh diode are turned off, the second MOS tube, the third MOS tube, the second diode, the fifth diode and the sixth diode are turned on, and the output voltage is positive second capacitor voltage;
mode three: the first MOS tube, the third MOS tube, the first diode, the second diode, the fourth diode and the sixth diode are turned off, the second MOS tube, the fourth MOS tube, the third diode, the fifth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage;
and a fourth mode: and the first MOS tube, the third MOS tube, the first diode, the third diode, the fourth diode and the sixth diode are turned off, the second MOS tube, the fourth MOS tube, the second diode, the fifth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage.
The invention also discloses another working method of the single-phase single-stage coupling inductor type split-source boost inverter, the triangular connection type coupling inductor is in a discharging state, and the boost inverter works in the following modes:
a fifth mode: and the second MOS tube, the fourth MOS tube, the second diode, the third diode, the fifth diode and the seventh diode are turned off, the first MOS tube, the third MOS tube, the first diode, the fourth diode and the sixth diode are turned on, and the output voltage is positive second capacitor voltage.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. by adopting the triangular connection type coupling inductor, the voltage gain of the converter is greatly improved, the voltage peak of an active device is eliminated, the number of used passive devices is reduced, the power density of the converter is improved, and the volume, the weight and the cost of the converter are reduced;
2. by adopting a split source structure, the inductance charging duty ratio D is increased to obtain high voltage gain, and the modulation coefficient M is also increased, so that the waveform quality of the output voltage is ensured on the premise of high voltage gain;
3. by adopting a double BUCK structure, bridge arm direct connection risks are effectively inhibited, the dead time setting requirement is reduced, and the waveform quality of output voltage is improved while the reliability of the converter is improved; and the input current and the output current of the converter are continuous, so that the converter is very suitable for the technical field of green renewable energy power generation.
Drawings
FIG. 1 is a circuit schematic of the present invention;
fig. 2(a) and fig. 2(b) are respectively a schematic diagram of a key waveform of a modulation strategy and a control logic diagram of the present invention;
FIG. 3 is a graphical illustration of output boost factor versus conventional Z-source inverters for the present invention;
fig. 4(a), fig. 4(b), fig. 4(c) and fig. 4(d) are schematic diagrams illustrating states of a mode one, a mode two, a mode three and a mode four respectively in the delta connection type coupled inductor charging state according to the present invention;
FIG. 5 is a schematic diagram of the mode of the present invention in the discharging state of the delta connection type coupled inductor;
FIG. 6(a) is a PSIM simulation diagram of the input current, the output voltage, the output current, and the first capacitor voltage of the present invention;
FIG. 6(b) is a schematic diagram of PSIM simulation of voltage stress of the first, second, third and fourth MOS transistors according to the present invention;
FIG. 6(c) is a PSIM simulation diagram of the voltage stress of the first, second and third diodes of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the drawings, components are exaggerated for clarity.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components and/or sections, these elements, components and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, and/or section from another. Thus, a first element, component, and/or section discussed below could be termed a second element, component, or section without departing from the teachings of the present invention.
Referring to fig. 1, the invention discloses a single-phase single-stage coupled inductor split-source boost inverter, which comprises a boost circuit, a bridge arm through-connection prevention circuit and an output circuit; the booster circuit comprises a first winding, a second winding, a third winding, a fourth winding, a fifth winding, a sixth diode, a sixth MOS tube, a sixth tube, a fourth tube, a sixth tube, a fourth tube, a; the bridge arm through-connection preventing circuit comprises fourth to seventh diodes and first to fourth inductors; the output circuit comprises a fifth inductor, a second capacitor and an output resistor;
the first winding, the second winding and the third winding form a triangular connection type coupling inductor, and the positive electrode of the second winding is respectively connected with the positive electrode of the third winding and the positive electrode of an input voltage source; the negative electrode of the second winding is respectively connected with the negative electrode of the first winding and the positive electrode of the first diode; the anode of the first winding is connected with the cathode of the third winding, the anode of the second diode and the anode of the third diode respectively;
the cathode of the first diode is respectively connected with the anode of the first capacitor, the drain electrode of the first MOS tube, the cathode of the fourth diode, the drain electrode of the third MOS tube and the cathode of the sixth diode;
the cathode of the first capacitor is respectively connected with the cathode of the input voltage source, the anode of the fifth diode, the source electrode of the second MOS tube, the anode of the seventh diode and the source electrode of the fourth MOS tube;
the source electrode of the first MOS tube is respectively connected with one end of the first inductor and the negative electrode of the fifth diode;
the anode of the fourth diode is respectively connected with the cathode of the second diode, one end of the second inductor and the drain of the second MOS tube;
the source electrode of the third MOS tube is respectively connected with one end of a third inductor and the negative electrode of a seventh diode;
the anode of the sixth diode is respectively connected with the cathode of the third diode, one end of the fourth inductor and the drain of the fourth MOS tube;
one end of the fifth inductor is connected with the other end of the first inductor and the other end of the second inductor respectively, and the other end of the fifth inductor is connected with the anode of the second capacitor and one end of the output resistor respectively;
the negative electrode of the second capacitor is respectively connected with the other end of the fourth inductor, the other end of the output resistor and the other end of the third inductor;
and one end of the fifth inductor, which is connected with the first inductor, is used as one output end a of the single-phase single-stage coupling inductor type split source boost inverter, and one end of the output resistor, which is connected with the third inductor, is used as the other output end b of the single-phase single-stage coupling inductor type split source boost inverter.
In FIG. 1, V dc Is a voltage source, N 1 、N 2 、N 3 Respectively a first, a second and a third winding, C 1 、C 2 Respectively a first and a second capacitor, D 1 、D 2 、D 3 、D 4 、D 5 、D 6 、D 7 Respectively a first, a second, a third, a fourth, a fifth, a sixth and a seventh diode, S 1 、S 2 、S 3 、S 4 Respectively a first, a second, a third and a fourth MOS transistor, L 1 、L 2 、L 3 、L 4 、L 5 Respectively a first, a second, a third, a fourth and a fifth inductor, R 1 Is an output resistor.
As shown in fig. 2(a), the key waveform diagram of the pulse width modulation strategy of the present invention is composed of three waveforms: first modulated wave V ra A second modulated wave V rb And carrier V tri 。
First modulated wave V ra And carrier wave V tri Comparing to obtain a first MOS transistor S and a second MOS transistor S 1 、S 2 A second modulation wave V rb And carrier wave V tri Comparing to obtain a third MOS tube S and a fourth MOS tube S 3 、S 4 The drive signal of (2).
As shown in FIG. 2(b), V ra Greater than V tri When S is present 1 Opening; v ra Less than V tri When S is present 2 Opening; v rb Greater than V tri When S is present 3 General formula I, V rb Less than V tri When S is present 4 The method is simple.
Fig. 3 is a graph illustrating the output boost factor versus a conventional Z-source inverter for the present invention.
The invention also discloses a working method of the single-phase single-stage coupling inductance type split-source boost inverter, the triangular connection type coupling inductance is in a charging state, and the converter works in the following four modes:
a first mode: as shown in FIG. 4(a), the first diode D 1 A second diode D 2 A fifth diode D 5 A sixth diode D 6 Off, third diode D 3 A fourth diode D 4 The seventh diode D 7 Conducting the second MOS transistor S 2 And the third MOS transistor S 3 Turn off, the first MOS transistor S 1 And the fourth MOS transistor S 4 On, voltage source V dc Charging the delta-connected coupling inductor with a first capacitor C 1 A second capacitor C with positive discharge output voltage 2 A voltage;
mode two: as shown in fig. 4(b), a first diode D 1 A third diode D 3 A fourth diode D 4 The seventh diode D 7 Off, second diode D 2 A fifth diode D 5 A sixth diode D 6 Conducting the first MOS transistor S 1 And the fourth MOS transistor S 4 Turn-off, second MOS transistor S 2 And the third MOS transistor S 3 On, voltage source V dc Charging the delta-connected coupling inductor with a first capacitor C 1 A second capacitor C with positive discharge output voltage 2 A voltage;
a third mode: as shown in FIG. 4(c), the firstDiode D 1 A second diode D 2 A fourth diode D 4 A sixth diode D 6 Off, third diode D 3 A fifth diode D 5 The seventh diode D 7 Conducting the first MOS transistor S 1 And the third MOS transistor S 3 Turn-off, second MOS transistor S 2 And the fourth MOS transistor S 4 On, voltage source V dc Charging the delta-connected coupling inductor with a first capacitor C 1 Second capacitor C with positive output voltage when disconnected 2 A voltage;
and a fourth mode: as shown in fig. 4(D), the first diode D 1 A third diode D 3 A fourth diode D 4 A sixth diode D 6 Off, second diode D 2 A fifth diode D 5 The seventh diode D 7 Conducting the first MOS transistor S 1 And the third MOS transistor S 3 Turn-off, second MOS transistor S 2 And the fourth MOS transistor S 4 On, voltage source V dc Charging the delta connection type coupling inductor with a first capacitor C 1 Second capacitor C with positive output voltage when disconnected 2 A voltage.
The invention also discloses another working method of the single-phase single-stage coupling inductor type split-source boost inverter, the triangular connection type coupling inductor is in a discharging state, and the boost inverter works in the following modes:
a fifth mode: as shown in fig. 5, a second diode D 2 A third diode D 3 A fifth diode D 5 The seventh diode D 7 Off, the first diode D 1 A fourth diode D 4 A sixth diode D 6 Conducting the second MOS transistor S 2 And the fourth MOS transistor S 4 Turn-off, first MOS transistor S 1 And the third MOS transistor S 3 On, voltage source V dc The triangular connection type coupling inductor couples with the first capacitor C 1 A second capacitor C with positive output voltage 2 A voltage.
From FIG. 2(a), the modulation factor is M ac Offset is M dc Setting the charging duty ratio of the delta connection type coupling inductor of the inverter toD is shown as the formula (1).
During the charging operation of the delta-connected coupled inductor, the operation of modes 1 to 4 is defined as follows:
V dc ＝V N3 (2)
during the operation of the delta connection type coupled inductor in the discharging state, the operation condition of the mode 5 is corresponded, so the following formula is provided:
the voltage-second product of the inductance voltage is balanced to obtain
From (4), the converter DC voltage gain is
Gain of AC output voltage of
In steady state, the first MOS transistor S 1 A second MOS transistor S 2 And the third MOS transistor S 3 And the fourth MOS transistor S 4 Has a voltage stress of
In steady state, the first diode D 1 A second onePolar tube D 2 A third diode D 3 Respectively of voltage stress of
V D1 ＝V C -V dc +V N2 (8)
Compared with the traditional impedance source boosting inverter, the circuit can adjust the output voltage gain by adjusting the duty ratio and also can adjust the output voltage gain by setting a proper winding ratio, and the adjustment freedom degree of the output voltage gain is high.
FIG. 3 shows the output boost factor versus the conventional Z-source inverter for the circuit of the present invention, where the abscissa is the modulation factor M ac It can be seen from the figure that the output DC gain and AC gain of the circuit of the present invention follows the modulation factor M ac The gain of the high voltage can be obtained on the premise of ensuring the high quality of the output voltage.
In summary, the circuit of the invention has higher voltage gain, eliminates the voltage peak of the active device, reduces the number of the passive devices, improves the power density of the converter, and reduces the volume, the weight and the cost of the converter; the inductance charging duty ratio D is increased to obtain high voltage gain, and the modulation coefficient M can be increased at the same time, so that the waveform quality of the output voltage is ensured on the premise of high voltage gain; the bridge arm direct-connection risk is effectively inhibited, the dead time setting requirement is reduced, and the waveform quality of the output voltage is improved while the reliability of the converter is improved; and the input current and the output current of the converter are continuous, so that the converter is very suitable for the technical field of green renewable energy power generation.
The circuit of the invention works at M ac ＝0.625、M dc 0.4, switching frequency f s 33kHz, input voltage V dc ＝30V、C 1 470uF, triangle connection type coupling inductance winding ratio N1: N2: N3: 20:30:10, L 1 ＝L 2 ＝L 3 ＝L 4 ＝0.1mH、L 5 ＝1.5mH、C 2 ＝10uF、R 1 When the voltage is equal to 50 Ω, a schematic diagram of the PSIM simulation of the input current, the output voltage, the output current, and the first capacitor voltage is shown in fig. 6(a), a schematic diagram of the PSIM simulation of the voltage stress of the first, second, third, and fourth MOS transistors is shown in fig. 6(b), and a schematic diagram of the PSIM simulation of the voltage stress of the first, second, and third diodes is shown in fig. 6 (c).
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. A single-phase single-stage coupling inductance type split-source boost inverter is characterized by comprising first to third windings, first to second capacitors, first to seventh diodes, first to fourth MOS (metal oxide semiconductor) tubes, an output resistor and first to fifth inductors;
the first winding, the second winding and the third winding form a triangular connection type coupling inductor, and the positive electrode of the second winding is respectively connected with the positive electrode of the third winding and the positive electrode of an input voltage source; the negative electrode of the second winding is respectively connected with the negative electrode of the first winding and the positive electrode of the first diode; the anode of the first winding is connected with the cathode of the third winding, the anode of the second diode and the anode of the third diode respectively;
the cathode of the first diode is respectively connected with the anode of the first capacitor, the drain electrode of the first MOS tube, the cathode of the fourth diode, the drain electrode of the third MOS tube and the cathode of the sixth diode;
the cathode of the first capacitor is respectively connected with the cathode of the input voltage source, the anode of the fifth diode, the source electrode of the second MOS tube, the anode of the seventh diode and the source electrode of the fourth MOS tube;
the source electrode of the first MOS tube is respectively connected with one end of the first inductor and the negative electrode of the fifth diode;
the anode of the fourth diode is respectively connected with the cathode of the second diode, one end of the second inductor and the drain of the second MOS tube;
the source electrode of the third MOS tube is respectively connected with one end of a third inductor and the negative electrode of a seventh diode;
the anode of the sixth diode is respectively connected with the cathode of the third diode, one end of the fourth inductor and the drain of the fourth MOS tube;
one end of the fifth inductor is connected with the other end of the first inductor and the other end of the second inductor respectively, and the other end of the fifth inductor is connected with the anode of the second capacitor and one end of the output resistor respectively;
the negative electrode of the second capacitor is respectively connected with the other end of the fourth inductor, the other end of the output resistor and the other end of the third inductor;
and one end of the fifth inductor, which is connected with the first inductor, is used as one output end a of the single-phase single-stage coupling inductor type split source boost inverter, and one end of the output resistor, which is connected with the third inductor, is used as the other output end b of the single-phase single-stage coupling inductor type split source boost inverter.
2. The method of claim 1, wherein the delta connection type coupling inductor is in a charging state, and the boost inverter operates in the following four modes:
the first mode is as follows: the second MOS tube, the third MOS tube, the first diode, the second diode, the fifth diode and the sixth diode are turned off, the first MOS tube, the fourth MOS tube, the third diode, the fourth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage;
mode two: the first MOS tube, the fourth MOS tube, the first diode, the third diode, the fourth diode and the seventh diode are turned off, the second MOS tube, the third MOS tube, the second diode, the fifth diode and the sixth diode are turned on, and the output voltage is positive second capacitor voltage;
mode three: the first MOS tube, the third MOS tube, the first diode, the second diode, the fourth diode and the sixth diode are turned off, the second MOS tube, the fourth MOS tube, the third diode, the fifth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage;
and a fourth mode: and the first MOS tube, the third MOS tube, the first diode, the third diode, the fourth diode and the sixth diode are turned off, the second MOS tube, the fourth MOS tube, the second diode, the fifth diode and the seventh diode are turned on, and the output voltage is positive second capacitor voltage.
3. The operating method of the single-phase single-stage coupled inductor split-source boost inverter according to claim 1, wherein the delta-connection coupled inductor is in a discharging state, and the boost inverter operates in the following modes:
a fifth mode: and the second MOS tube, the fourth MOS tube, the second diode, the third diode, the fifth diode and the seventh diode are turned off, the first MOS tube, the third MOS tube, the first diode, the fourth diode and the sixth diode are turned on, and the output voltage is positive second capacitor voltage.
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