CN112713769A - Single-switch Boost three-level converter based on Boost formula - Google Patents
Single-switch Boost three-level converter based on Boost formula 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
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Abstract
The application discloses three level converter of single switch Boost based on formula of stepping up includes: a first sub-circuit and a second sub-circuit, the first sub-circuit being in series with the second sub-circuit; the first sub-circuit comprises a coupling inductor primary winding, a switching tube, a fourth diode, a sixth diode, a fourth capacitor and a sixth capacitor; the second sub-circuit comprises a coupling inductor secondary winding, a first diode, a second diode, a third diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, an output rectifier diode and a voltage stabilizing capacitor; the switching tube is used for controlling the connection state of the first sub-circuit and the second sub-circuit to form the boost three-level converter. The converter based on cascade or double switches can solve the technical problems that the number of circuit devices is increased, circuit control is complicated, efficiency is not high, and cost is high in the existing converter based on cascade or double switches.
Description
Technical Field
The application relates to the technical field of Boost converters, in particular to a single-switch Boost three-level converter based on a Boost formula.
Background
Solar energy and wind energy are widely applied, however, how to realize grid-connected operation of the systems and meet the requirement of high voltage in a power grid is still the most important problem, and a DC-DC converter with high voltage gain characteristic plays an indispensable role in the new energy power generation grid-connected process. The duty ratio of the conventional BOOST converter cannot be too high due to the influence of parasitic parameters, so that the voltage gain capability of the BOOST converter is low, the voltage stress of a switching tube is large, and the power loss is serious, so that the BOOST converter cannot provide a high enough voltage gain ratio to increase the voltage to meet the grid-connection requirement under the condition of high efficiency. Therefore, a cascade BOOST converter, a dual-switch BOOST three-level converter and the like are sequentially provided, but a series of problems of increased device number, low efficiency, complicated circuit, complicated controller, high cost and the like exist.
Disclosure of Invention
The application provides a single-switch Boost three-level converter based on a Boost formula for solving the technical problems that the existing converter based on cascade connection or double switches causes the quantity of circuit devices to increase, the circuit control is complicated, the efficiency is not high and the cost is high.
In view of the above, a first aspect of the present application provides a single-switch Boost three-level converter based on a Boost formula, including: a first sub-circuit and a second sub-circuit, the first sub-circuit in series with the second sub-circuit;
the first sub-circuit comprises a coupling inductor primary winding, a switching tube, a fourth diode, a sixth diode, a fourth capacitor and a sixth capacitor;
the second sub-circuit comprises a coupling inductor secondary winding, a first diode, a second diode, a third diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, an output rectifier diode and a voltage stabilizing capacitor;
the switching tube is used for controlling the connection state of the first sub-circuit and the second sub-circuit to form the boost three-level converter.
Optionally, the positive electrode of the input power supply is connected to one end of the primary winding of the coupling inductor, and the other end of the primary winding of the coupling inductor is connected to the anode of the sixth diode and the drain of the switching tube, respectively.
Optionally, a cathode of the sixth diode is connected to an anode of the fourth diode and one end of the fourth capacitor, respectively.
Optionally, the other end of the fourth capacitor is connected to one end of the secondary winding of the coupling inductor, one end of the first capacitor, and one end of the fifth capacitor, respectively.
Optionally, the other end of the fifth capacitor is connected to the anode of the third diode and the cathode of the fifth diode, respectively.
Optionally, the other end of the secondary winding of the coupling inductor is connected to one end of the voltage-stabilizing capacitor, one end of the second capacitor, one end of the third capacitor, one end of the sixth capacitor, a cathode of the fourth diode, and an anode of the fifth diode, respectively.
Optionally, the other end of the third capacitor is connected to the anode of the first diode and the cathode of the third diode, respectively.
Optionally, the cathode of the first diode is connected to the anode of the second diode and the other end of the first capacitor, respectively.
Optionally, the cathode of the second diode is connected to the other end of the second capacitor and the anode of the output rectifying diode, respectively.
Optionally, the cathode of the output rectifying diode is connected to the other end of the voltage stabilizing capacitor and one end of the load resistor respectively;
the other end of the sixth capacitor, the source electrode of the switch tube and the other end of the load resistor are connected with the negative electrode of the input power supply.
According to the technical scheme, the embodiment of the application has the following advantages:
in the present application, a single-switch Boost three-level converter based on a Boost formula is provided, including: a first sub-circuit and a second sub-circuit, the first sub-circuit in series with the second sub-circuit; the first sub-circuit comprises a coupling inductor primary winding, a switching tube, a fourth diode, a sixth diode, a fourth capacitor and a sixth capacitor; the second sub-circuit comprises a coupling inductor secondary winding, a first diode, a second diode, a third diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, an output rectifier diode and a voltage stabilizing capacitor; the switching tube is used for controlling the connection state of the first sub-circuit and the second sub-circuit to form the boost three-level converter.
The single-switch Boost three-level converter based on the Boost formula comprises a switch tube, a multiple cascade Boost converter does not exist, the communication state of a first sub-circuit and a second sub-circuit is controlled through the single switch tube, and the conducting wire of the circuit is adjusted, so that the Boost three-level converter is obtained, components required by the circuit are simple, the control is easy to realize, the efficiency can be improved, the number of the components is small, and the cost can be reduced; the problem of three-level voltage imbalance can also be avoided by using a single switch. Therefore, the converter can solve the technical problems that the number of circuit devices is increased, the circuit control is complicated, the efficiency is not high and the cost is high due to the fact that the existing converter based on cascade or double switches is adopted.
Drawings
Fig. 1 is a schematic diagram of a topology structure of a single-switch Boost three-level converter based on a Boost formula according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a first operation mode of a three-level converter according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a second operation mode of the three-level converter according to the embodiment of the present application;
fig. 4 is a schematic structural diagram of a third operation mode of the three-level converter according to the embodiment of the present application;
fig. 5 is a schematic structural diagram of a fourth operation mode of the three-level converter according to the embodiment of the present application;
fig. 6 is a schematic structural diagram of a fifth operation mode of a three-level converter according to an embodiment of the present application;
FIG. 7 is a graph of voltage waveforms of the output voltage, the voltage across the voltage stabilizing capacitor, and the voltage across the sixth capacitor according to an embodiment of the present application;
fig. 8 is a graph illustrating voltage waveforms of voltages at two ends of a primary winding of a coupling inductor, a current flowing through the primary winding of the coupling inductor, and a gate source voltage of a switching tube according to the embodiment of the present application;
fig. 9 is a diagram of a secondary winding L of a coupled inductor according to an embodiment of the present application2Voltage at two ends, current flowing through a secondary winding of the coupling inductor and a voltage waveform diagram of a grid source of the switching tube;
FIG. 10 is a graph of voltage of a third diode, current of the third diode, and gate-source voltage waveform of a switching tube according to an embodiment of the present disclosure;
fig. 11 is a graph of voltage of a fourth diode, current of the fourth diode, and gate-source voltage waveform of a switching tube according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For easy understanding, please refer to fig. 1, the present application provides an embodiment of a single-switch Boost three-level converter based on a Boost formula, including: a first sub-circuit and a second sub-circuit, the first sub-circuit being in series with the second sub-circuit.
The first sub-circuit comprises a coupling inductor primary winding, a switching tube, a fourth diode, a sixth diode, a fourth capacitor and a sixth capacitor;
the second sub-circuit comprises a coupling inductor secondary winding, a first diode, a second diode, a third diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, an output rectifier diode and a voltage stabilizing capacitor;
the switching tube is used for controlling the connection state of the first sub-circuit and the second sub-circuit to form the boost three-level converter.
Furthermore, the positive electrode of the input power supply is connected with one end of the primary winding of the coupling inductor, and the other end of the primary winding of the coupling inductor is respectively connected with the anode of the sixth diode and the drain of the switching tube.
Further, the cathode of the sixth diode is connected to the anode of the fourth diode and one end of the fourth capacitor, respectively.
Furthermore, the other end of the fourth capacitor is connected to one end of the secondary winding of the coupling inductor, one end of the first capacitor, and one end of the fifth capacitor, respectively.
Further, the other end of the fifth capacitor is connected to the anode of the third diode and the cathode of the fifth diode, respectively.
Further, the other end of the secondary winding of the coupling inductor is connected to one end of the voltage-stabilizing capacitor, one end of the second capacitor, one end of the third capacitor, one end of the sixth capacitor, the cathode of the fourth diode, and the anode of the fifth diode, respectively.
Further, the other end of the third capacitor is connected to the anode of the first diode and the cathode of the third diode, respectively.
Further, the cathode of the first diode is connected to the anode of the second diode and the other end of the first capacitor, respectively.
Further, the cathode of the second diode is connected to the other end of the second capacitor and the anode of the output rectifying diode, respectively.
Furthermore, the cathode of the output rectifier diode is respectively connected with the other end of the voltage-stabilizing capacitor and one end of the load resistor; the other end of the sixth capacitor, the source electrode of the switch tube and the other end of the load resistor are connected with the negative electrode of the input power supply.
Referring to fig. 1, reference zero voltage O is coupled to primary winding L of inductor1The equivalent circuit of (1) is leakage inductance
And an excitation inductance LMIdeal primary transformer with N turns1The number of turns of the secondary side ideal transformer is N2And N is the turn ratio of the primary coil and the secondary coil of the coupling inductor.
Input power supply VinHas a current of iinInput power supply VinHas a voltage of VinPrimary winding L of coupled inductor1Current of
Coupled inductor primary winding L1A voltage of both sides of
Coupled inductor primary winding L1Is not sensed
Current of
Coupled inductor primary winding L1Is not sensed
A voltage of both sides of
Secondary winding L of coupling inductor2Current of
Secondary winding L of coupling inductor2A voltage of both sides of
Output rectifier diode DoCurrent of
Output rectifier diode DoA voltage across is
The current flowing through the switching tube S is iSThe voltage at the two ends of S drain-source of the switch tube is VDSThe voltage at two ends of S grid source of the switch tube is VGS。
First diode D1Current of
First diode D1A voltage across is
Second diode D2Current of
Second diode D2A voltage across is
Third diode D3Current of
Third diode D3A voltage across is
Fourth diode D4Current of
Fourth diode D4A voltage across is
Fifth diode D5Current of
Fifth diode D5A voltage across is
Sixth diode D6Current of
Sixth diode D6A voltage across is
A first capacitor C1Current of
A first capacitor C1A voltage across is
Second capacitor C2Current of
Second capacitor C2A voltage across is
Third capacitor C3Current of
Third capacitor C3A voltage across is
Fourth capacitor C4Current of
Fourth capacitor C4A voltage across is
Fifth capacitor C5Current of
Fifth capacitor C5A voltage across is
Sixth capacitor C6Current of
Sixth capacitor C6A voltage across is
Voltage-stabilizing capacitor CoCurrent of
Voltage-stabilizing capacitor CoA voltage across is
The current of the load resistor R is io。
When the three-level converter is constructed by the switching tube, the voltage-stabilizing capacitor CoThe voltage at the two ends is equal to the voltage at the two ends of the sixth capacitor, or the voltage at the two ends of the second capacitor is equal to the voltage at the two ends of the sixth capacitor; the coil ratio N of the primary winding to the secondary winding of the coupling inductor can also be adjusted to 1.
Aiming at the first sub-circuit, when the switching tube S is conducted, the primary winding L of the coupling inductor1And a fourth capacitance C4Storing energy; when the switch tube S is turned off, the input power supply VinPrimary winding L of coupled inductor1A fourth capacitor C4And a secondary winding L of the coupling inductor2Connected in series to a sixth capacitor C6Charging, sixth capacitor C6Is equal to Vin、L1、L2And C4The sum of the voltages of (a).
For the second sub-circuit, when the switch tube S is conducted, the secondary winding L of the coupling inductor2And a fifth capacitance C5To a third capacitor C3Charging, third capacitor C3Is equal to L2And C5While coupling the secondary winding L of the inductor2And a first capacitor C1Connected in series to a second capacitor C2Charging; when the switch tube S is turned off, the second capacitor C2By output rectifier diode DoVoltage-stabilizing capacitor CoCharging, second capacitor C2Is transferred to a voltage stabilizing capacitor CoThe above. At this time, if the voltage-stabilizing capacitor CoThe voltage at both ends is equal to the sixth capacitor C6Voltage across, or second capacitance C2The voltage at both ends is equal to the sixth capacitor C6And the voltages at the two ends can obtain a boost three-level converter.
The first sub-circuit and the second sub-circuit are interconnected, constrained to each other.
A sixth capacitor C6The other end of the load resistor R, the source electrode of the switching tube S and the other end of the load resistor R are all connected with the negative electrode of the input power supply, so that the technical problem that the traditional three-level ground supply is not available to cause system safety is effectively solved.
The single-switch Boost three-level converter based on the Boost formula in the embodiment of the application can be divided into a plurality of different working modes:
in a first working mode, referring to FIG. 2, the switch tube S is turned on and the input power V is suppliedinPrimary winding L of coupled inductor1Magnetizing inductance L ofMAnd leakage inductance LKCharging so as to flow through the primary winding L of the coupling inductor1Magnetizing inductance L ofMAnd leakage inductance LKThe current of (2) increases linearly. While coupling the secondary winding L of the inductor2In the follow current stage, the current flowing through the follow current stage is reduced; and, a secondary winding L of the coupling inductor2Respectively and input power source VinPrimary winding L of coupled inductor1A fourth capacitor C4Connected in series to a sixth capacitor C6Charging; secondary winding L of coupling inductor2While supplying a fifth capacitor C5And (6) charging. In addition, a secondary winding L of the coupling inductor2And a third capacitor C3Connected in series to the first capacitor C1And (6) charging. Input power supply VinPrimary winding L of coupled inductor1A fourth capacitor C4Secondary winding L of coupled inductor2And a second capacitor C2Are connected in series and together supply power to the load R.
In a second mode, referring to fig. 3, the switching tube S is turned on and coupled to the secondary winding L of the inductor2Afterflow ends, L2Current start ofAnd is increased. Secondary winding L of coupling inductor2Through a fourth diode D4To a fourth capacitor C4Charging; secondary winding L of simultaneous coupling inductor2And a fifth capacitor C5A first capacitor C1Are connected in series and are respectively provided for a third capacitor C3A second capacitor C2And (6) charging. And the sixth capacitor is connected with the voltage stabilizing capacitor in series and supplies power to the load R together.
In this operating state, the circuit parameters satisfy the following equation:
wherein the content of the first and second substances,
when the switch tube is conducted, the voltage of the primary winding of the file is coupled.
In a third mode, referring to fig. 4, the switching tube S is turned off and coupled to the primary winding L of the inductor1Discharge is initiated and the current decreases. Primary winding L stored in coupling inductor1Is less thanKThrough a sixth diode D6A fourth capacitor C4A fifth capacitor C5A third capacitor C3Is discharged to the sixth capacitor C6In (1). Thus, the fourth capacitance C4A fifth capacitor C5A third capacitor C3And a sixth capacitance C6Clamping coupling inductance primary winding L adopting series connection mode1And a switching tube S, thereby inhibiting the primary winding L of the coupling inductor1And voltage spikes of the switching tube S. While coupling the secondary winding L of the inductor2Operating in freewheel mode, the current decreases. Secondary winding L of coupling inductor2Still connected to the fifth capacitor C5Connected in series and through a third diode D3To a third capacitor C3Charging; secondary winding L of coupling inductor2And also a first capacitor C1Connected in series to a second capacitor C2And (6) charging. When coupling the secondary winding L of the inductor2The mode ends when the current of (c) decreases to zero.
Fourth working dieReferring to FIG. 5, a fifth diode D5A first diode D1And an output rectifier diode D0Zero current conduction. Input power supply VinPrimary winding L of coupled inductor1A fourth capacitor C4Secondary winding L of coupled inductor2And a second capacitor C2Connected in series to a sixth capacitor C6Charging; secondary winding L of simultaneous coupling inductor2Through a fifth diode D5To a fifth capacitor C5And (6) charging. Thus the fourth capacitance C4A fifth capacitor C5And a sixth capacitance C6Indirectly feeding primary winding L of coupled inductor1And a switching tube C6Primary winding L of clamping and suppressing coupled inductor1And a switching tube C6While storing the primary winding L of the coupled inductor1Is less thanKThereby improving the efficiency of the boost converter. In addition, a secondary winding L of the coupling inductor2And a third capacitor C3Connected in series and via a first diode D1For the first capacitor C1And (6) charging. At the same time, the input power VinPrimary winding L of coupled inductor1A fourth capacitor C4Secondary winding L of coupled inductor2And a second capacitor C2In series connection with a load R and a voltage-stabilizing capacitor C0And (5) supplying power. When flowing through the primary winding L of the coupling inductor1Is less thanKThe mode ends when the current of (c) decreases to zero.
In a fifth mode of operation, please refer to fig. 6, the sixth diode D6Zero current off, sixth capacitor C6And a second capacitor C2The series connection supplies power to a load R. In addition, a secondary winding L of the coupling inductor2Still through the fifth diode D5To a fifth capacitor C5Charging; while coupling the secondary winding L of the inductor2Still connected to the third capacitor C3Connected in series and via a first diode D1For the first capacitor C1And (6) charging. When the next switching cycle comes, the mode ends.
When the circuit operates in the fourth mode and the fifth mode, the circuit parameters satisfy the following equation:
wherein the content of the first and second substances,
when the switch tube is turned off, the voltage of the primary winding of the inductor is coupled.
The following equations can be organized according to the equations satisfied by all the circuit parameters:
the gain of the boost three-level converter is as follows:
when N is 1, there is the following equation:
thus, by making 1: 1, which is a three-level converter, while the voltage gain of the converter is
It can be seen that the converter needs to be set to obtain a three-level converter when N is 1.
When the single-switch Boost three-level converter based on the Boost formula operates according to the first working mode to the fifth working mode, S-gate-source voltage V of a switching tube in a circuitGSThree-level converter output voltage VoVoltage stabilizing capacitor C0Voltage across
Sixth capacitor C6Voltage across
Coupled inductor primary winding L1Voltage across
Primary winding L of current-coupling inductor1Electric current
Secondary winding L of coupling inductor2Voltage across
Secondary winding L of current-coupling inductor2Electric current
Third diode D3Voltage of
Third diode D3Current of
Fourth diode D4Voltage of
Fourth diode D4Current of
Is shown in fig. 7-11, wherein fig. 7 is a graph showing the waveform of the input power source Vin40V, duty ratio D is 0.58, output voltage VoVoltage stabilizing capacitor two-terminal voltage
And the voltage across the sixth capacitor
A waveform diagram; FIG. 8 shows the state of the input power supply Vin40V, when the duty ratio D is 0.58, the primary winding L of the coupling inductor1Voltage across
Primary winding L of current-coupling inductor1Electric current
And the S grid source voltage V of the switching tubeGSA waveform diagram; FIG. 9 shows the state of the input power supply Vin40V, when the duty ratio D is 0.58, the secondary winding L of the coupling inductor2Voltage across
Secondary winding L of current-coupling inductor2Electric current
And the S grid source voltage V of the switching tubeGSA waveform diagram; FIG. 10 shows the state of the input power supply Vin40V, and the duty ratio D is 0.58, and the third diode D3Voltage of
Third diode D3Current of
And the S grid source voltage V of the switching tubeGSA waveform diagram; FIG. 11 shows the state of an input power supply Vin40V, and the duty ratio D is 0.58, the fourth diode D4Voltage of
Fourth diode D4Current of
And the S grid source voltage V of the switching tubeGSAnd (4) waveform diagrams.
The single-switch Boost three-level converter based on the Boost formula comprises a switch tube, a multiple cascade Boost converter does not exist, the communication state of a first sub-circuit and a second sub-circuit is controlled through the single switch tube, and the conducting wire of the circuit is adjusted, so that the Boost three-level converter is obtained, components required by the circuit are simple, the control is easy to realize, the efficiency can be improved, the number of the components is small, and the cost can be reduced; the problem of three-level voltage imbalance can also be avoided by using a single switch. Therefore, the converter can solve the technical problems that the number of circuit devices is increased, the circuit control is complicated, the efficiency is not high and the cost is high due to the fact that the existing converter based on cascade or double switches is adopted.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A single-switch Boost three-level converter based on a Boost formula is characterized by comprising: a first sub-circuit and a second sub-circuit, the first sub-circuit in series with the second sub-circuit;
the first sub-circuit comprises a coupling inductor primary winding, a switching tube, a fourth diode, a sixth diode, a fourth capacitor and a sixth capacitor;
the second sub-circuit comprises a coupling inductor secondary winding, a first diode, a second diode, a third diode, a fifth diode, a first capacitor, a second capacitor, a third capacitor, a fifth capacitor, an output rectifier diode and a voltage stabilizing capacitor;
the switching tube is used for controlling the connection state of the first sub-circuit and the second sub-circuit to form the boost three-level converter.
2. The Boost-formula-based single-switch Boost three-level converter according to claim 1, wherein an anode of an input power supply is connected to one end of the primary winding of the coupling inductor, and the other end of the primary winding of the coupling inductor is connected to an anode of the sixth diode and a drain of the switching tube, respectively.
3. A single-switch Boost three-level converter according to claim 2, wherein the cathode of said sixth diode is connected to the anode of said fourth diode and one end of said fourth capacitor, respectively.
4. A single-switch Boost three-level converter according to claim 3, wherein the other end of the fourth capacitor is connected to one end of the secondary winding of the coupled inductor, one end of the first capacitor and one end of the fifth capacitor, respectively.
5. A single-switch Boost three-level converter based on a Boost formula according to claim 4, characterized in that the other end of said fifth capacitor is connected to the anode of said third diode and the cathode of said fifth diode respectively.
6. The Boost-formula-based single-switch Boost three-level converter according to claim 5, wherein the other end of the secondary winding of the coupling inductor is connected to one end of the voltage-stabilizing capacitor, one end of the second capacitor, one end of the third capacitor, one end of the sixth capacitor, a cathode of the fourth diode, and an anode of the fifth diode, respectively.
7. A single-switch Boost three-level converter based on a Boost formula according to claim 6, characterized in that the other end of said third capacitor is connected to the anode of said first diode and the cathode of said third diode respectively.
8. A single-switch Boost three-level converter according to claim 7, wherein the cathode of said first diode is connected to the anode of said second diode and the other end of said first capacitor, respectively.
9. A single-switch Boost three-level converter according to claim 8, wherein the cathode of said second diode is connected to the other end of said second capacitor and the anode of said output rectifying diode, respectively.
10. The Boost-formula-based single-switch Boost three-level converter according to claim 9, wherein the cathode of the output rectifying diode is connected to the other end of the voltage-stabilizing capacitor and one end of a load resistor, respectively;
the other end of the sixth capacitor, the source electrode of the switch tube and the other end of the load resistor are connected with the negative electrode of the input power supply.
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