Seven-level mixed clamping type converter circuit
The seven-level hybrid clamp converter circuit solves the problems of voltage imbalance and high harmonic distortion in medium and high voltage power applications of traditional multilevel converters by adding diodes and flying capacitors, combined with DC bus capacitors and a three-phase structure, thus achieving more efficient and reliable power conversion.
Patent Information
- Application Number
- CN202510993464.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-18
- Publication Date
- 2025-10-31
AI Technical Summary
Traditional multilevel converters suffer from problems in medium and high voltage power applications, such as voltage imbalance due to differences in device parameters, high losses of switching elements, large electromagnetic interference, high system complexity, and high harmonic distortion rate of output current.
A seven-level hybrid clamp converter circuit is adopted. By adding diodes and flying capacitors, the voltage stress of the switching transistors is reduced, and the voltage ripple is suppressed by the DC bus capacitor. Combined with the three-phase structure, the harmonic distortion rate is reduced.
It effectively reduces the voltage stress of the switching transistor and the harmonic distortion rate of the output current, improves the efficiency and reliability of power conversion, and reduces the number of components and cost.
Smart Images
Figure CN120880217A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of electronic power technology, and in particular to a seven-level hybrid clamping converter circuit. Background Technology
[0002] To address the voltage imbalance and switching element losses caused by differences in device parameters in traditional two-level converters for medium and high voltage power applications, existing technologies often use multi-level converters to reduce switching losses and improve system efficiency.
[0003] However, in the grid connection of new energy sources and medium-voltage high-power fast charging, traditional multilevel converters use more low-frequency power switching elements. Although their operating characteristics make the losses of power switching elements and the electromagnetic interference generated relatively smaller than those of two-level converters, they increase the complexity of the system to a certain extent. This results in traditional multilevel converters using a large number of devices, high device voltage stress, and a high output current harmonic distortion rate. Summary of the Invention
[0004] This invention provides a seven-level hybrid clamp converter circuit to solve the above-mentioned technical problems, thereby reducing the voltage stress of the switching transistors and the harmonic distortion rate of the output current, and thus effectively improving the efficiency and quality of power conversion.
[0005] To address the aforementioned problems, this invention provides a seven-level hybrid clamping converter circuit, specifically comprising a seven-level clamping module and a power supply module; the seven-level clamping module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, a first flying capacitor, a second flying capacitor, a first diode, and a second diode; wherein:
[0006] The drain of the first switching transistor is electrically connected to the first port of the power module, and the source of the first switching transistor is electrically connected to the drain of the second switching transistor.
[0007] The drain of the second switching transistor is electrically connected to the drain of the third switching transistor, and the source of the second switching transistor is electrically connected to the second port of the power module.
[0008] The source of the third switch is electrically connected to the drain of the fourth switch, and the drain of the fourth switch is electrically connected to the positive terminal of the first flying capacitor.
[0009] The source of the fourth switch is electrically connected to the negative terminal of the first diode, and the negative terminal of the first diode is electrically connected to the drain of the fifth switch.
[0010] The negative terminal of the first flying capacitor is electrically connected to the positive terminal of the second flying capacitor, and the positive terminal of the second flying capacitor is electrically connected to the positive terminal of the first diode.
[0011] The positive terminal of the first diode is electrically connected to the negative terminal of the second diode;
[0012] The drain of the sixth switch is electrically connected to the third port of the power module, and the source of the sixth switch is electrically connected to the source of the eighth switch.
[0013] The source of the eighth switch is electrically connected to the drain of the seventh switch, and the source of the seventh switch is electrically connected to the fourth port of the power module.
[0014] The drain of the eighth switch is electrically connected to the source of the ninth switch, and the source of the ninth switch is electrically connected to the negative terminal of the second flying capacitor.
[0015] The drain of the ninth switch is electrically connected to the source of the tenth switch, and the source of the tenth switch is electrically connected to the positive terminal of the second diode.
[0016] The drain of the fourth switch is electrically connected to the source of the tenth switch and serves as the output of the seven-level clamping module.
[0017] The seven-level clamping module described above effectively reduces circuit cost and voltage stress on the four switching transistors by adding two diodes. The seven-level clamping module contains 10 switching transistors, 2 diodes, and 2 flying capacitors. The voltage stress borne by four of the switching transistors is 1 / 3 of the input bus voltage, and the voltage stress borne by the remaining eight switching transistors is 1 / 6 of the input DC bus voltage. Therefore, the above solution effectively reduces device voltage stress, and the seven-level clamping module has lower cost and higher reliability.
[0018] Furthermore, the power supply module includes a DC power supply, a first DC bus capacitor, a second DC bus capacitor, and a third DC bus capacitor; wherein:
[0019] The positive terminal of the first DC bus capacitor serves as the first port of the power module, and the negative terminal of the first DC bus capacitor serves as the second port of the power module.
[0020] The positive terminal of the first DC bus capacitor is electrically connected to one end of the positive terminal of the DC power supply, and the negative terminal of the first DC bus capacitor is electrically connected to the positive terminal of the second DC bus capacitor.
[0021] The negative terminal of the second DC bus capacitor is electrically connected to the positive terminal of the third DC bus capacitor;
[0022] The positive terminal of the third DC bus capacitor serves as the third port of the power module, and the negative terminal of the third DC bus capacitor serves as the fourth port of the power module.
[0023] The negative terminal of the third DC bus capacitor is electrically connected to the negative terminal of the DC power supply.
[0024] In the above scheme, the power supply module can provide voltage support for the seven-level hybrid clamp converter circuit and ensure the stability of each level output; in addition, the DC bus capacitor can effectively suppress voltage ripple and reduce harmonic distortion rate, thereby effectively improving the reliability of the circuit.
[0025] This invention also provides a seven-level hybrid clamping converter system, including a power supply module, an A-phase circuit, a B-phase circuit, and a C-phase circuit; the structures of the A-phase circuit, B-phase circuit, and C-phase circuit are all as described in the seven-level clamping module; wherein:
[0026] The drain of the first switching transistor in phase A circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in phase A circuit is electrically connected to the second port of the power module.
[0027] The drain of the sixth switch transistor in phase A circuit is electrically connected to the third port of the power module, and the source of the seventh switch transistor in phase A circuit is electrically connected to the fourth port of the power module.
[0028] The drain of the first switching transistor in the B-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in the B-phase circuit is electrically connected to the second port of the power module.
[0029] The drain of the sixth switch in the B-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch in the B-phase circuit is electrically connected to the fourth port of the power module.
[0030] The drain of the first switching transistor in the C-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in the C-phase circuit is electrically connected to the second port of the power module.
[0031] The drain of the sixth switch in the C-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch in the C-phase circuit is electrically connected to the fourth port of the power module.
[0032] The above solution, using a three-phase circuit with identical structure, can further reduce the overall harmonic distortion rate of the circuit. The A-phase, B-phase, and C-phase circuits effectively reduce harmonic components and improve circuit reliability. Furthermore, the addition of two diodes to each of the A-phase, B-phase, and C-phase circuits effectively reduces circuit cost and voltage stress on the four switching transistors. Each of the A-phase, B-phase, and C-phase circuits contains 10 switching transistors, 2 diodes, and 2 flying capacitors. The voltage stress borne by four of the switching transistors is 1 / 3 of the input bus voltage, and the voltage stress borne by the remaining eight switching transistors is 1 / 6 of the input DC bus voltage. Therefore, the above solution effectively reduces device voltage stress, and the A-phase, B-phase, and C-phase circuits are lower in cost and higher in reliability.
[0033] Furthermore, the power supply module includes a DC power supply, a first DC bus capacitor, a second DC bus capacitor, and a third DC bus capacitor; wherein:
[0034] The positive terminal of the first DC bus capacitor serves as the first port of the power module, and the negative terminal of the first DC bus capacitor serves as the second port of the power module.
[0035] The positive terminal of the first DC bus capacitor is electrically connected to one end of the positive terminal of the DC power supply, and the negative terminal of the first DC bus capacitor is electrically connected to the positive terminal of the second DC bus capacitor.
[0036] The negative terminal of the second DC bus capacitor is electrically connected to the positive terminal of the third DC bus capacitor;
[0037] The positive terminal of the third DC bus capacitor serves as the third port of the power module, and the negative terminal of the third DC bus capacitor serves as the fourth port of the power module.
[0038] The negative terminal of the third DC bus capacitor is electrically connected to the negative terminal of the DC power supply.
[0039] In the above scheme, the power supply module can provide voltage support for the seven-level hybrid clamp converter circuit and ensure the stability of each level output; in addition, the DC bus capacitor can effectively suppress voltage ripple and reduce harmonic distortion rate, thereby effectively improving the reliability of the circuit.
[0040] This solution also provides a seven-level hybrid clamp converter switching control method, applied to a seven-level hybrid clamp converter circuit described in the above solution. By changing the switching state of the seven-level clamp module, the method controls the magnitude of the output voltage of the seven-level clamp module; including:
[0041] When the first, third, fourth, fifth, and sixth switches are closed, and the second, seventh, eighth, ninth, and tenth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0042] When the second, seventh, eighth, ninth, and tenth switches are closed, and the first, third, fourth, fifth, and sixth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0043] Furthermore, when the first, third, fifth, sixth, and tenth switches are closed, and the second, fourth, seventh, eighth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode conducts, the second diode is cut off, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply voltage.
[0044] When the first, third, fifth, sixth, and tenth switches are closed, and the second, fourth, seventh, eighth, and ninth switches are open, and current flows into the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0045] Furthermore, when the first, third, sixth, ninth, and tenth switches are closed, and the second, fourth, fifth, seventh, and eighth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0046] When the first, fourth, fifth, sixth, and eighth switches are closed, and the second, third, seventh, ninth, and tenth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0047] Furthermore, when the second, third, fifth, sixth, and tenth switches are closed, and the first, fourth, seventh, eighth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode is turned on, the second diode is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply.
[0048] When the second, third, fifth, sixth, and tenth switches are closed, and the first, fourth, seventh, eighth, and ninth switches are open, and current flows in from the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply.
[0049] When the second, fifth, sixth, eighth, and tenth switches are closed, and the first, third, fourth, seventh, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode is turned on, the second diode is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply.
[0050] When the second, fifth, sixth, eighth, and tenth switches are closed, and the first, third, fourth, seventh, and ninth switches are open, and current flows in from the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply.
[0051] Furthermore, when the second, third, sixth, ninth, and tenth switches are closed, and the first, fourth, fifth, seventh, and eighth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0052] When the second, fourth, fifth, seventh, and eighth switches are closed, and the first, third, sixth, ninth, and tenth switches are open, both the first and second diodes are not conducting. The output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0053] Furthermore, when the second, fifth, eighth, seventh, and tenth switches are closed, and the first, third, fourth, sixth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode conducts, the second diode is cut off, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0054] When the second, fifth, eighth, seventh, and tenth switches are closed, and the first, third, fourth, sixth, and ninth switches are open, and current flows into the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
[0055] In the above scheme, by controlling the states of the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, and tenth switching transistors, the magnitude of the output voltage of the seven-level clamping module and the conduction status of the first and second diodes can be effectively adjusted. Specifically, the drive signals of the first and second switching transistors are complementary, the drive signals of the third and eighth switching transistors are complementary, the drive signals of the fourth and ninth switching transistors are complementary, the drive signals of the fifth and tenth switching transistors are complementary, and the drive signals of the sixth and seventh switching transistors are complementary. By dynamically adjusting the magnitude of the output voltage of the seven-level clamping module and the conduction status of the first and second diodes, the output harmonic distortion rate and the voltage stress on the devices can be effectively reduced, while also reducing the losses of the switching elements. Attached Figure Description
[0056] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0057] Figure 1 A circuit diagram of a seven-level hybrid clamping converter is provided in one embodiment of the present invention;
[0058] Figure 2 A schematic diagram of a seven-level hybrid clamp converter system provided in an embodiment of the present invention;
[0059] Figure 3This is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0060] Figure 4 (a) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0061] Figure 4 (b) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0062] Figure 5 (a) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0063] Figure 5 (b) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0064] Figure 6 (a) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is 0 of the voltage magnitude of the DC power supply;
[0065] Figure 6 (b) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is 0 of the voltage magnitude of the DC power supply;
[0066] Figure 6 (c) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is 0 of the voltage magnitude of the DC power supply;
[0067] Figure 6 (d) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is 0 of the voltage magnitude of the DC power supply;
[0068] Figure 7 (a) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0069] Figure 7 (b) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0070] Figure 8 (a) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0071] Figure 8 (b) is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage.
[0072] Figure 9 This is an equivalent circuit diagram of a seven-level hybrid clamping converter circuit provided in an embodiment of the present invention, wherein the output voltage is the magnitude of the DC power supply voltage. Detailed Implementation
[0073] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0074] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.
[0075] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.
[0076] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0077] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.
[0078] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).
[0079] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.
[0080] Please see Figure 1 To address the aforementioned issues, this embodiment provides a seven-level hybrid clamping converter circuit, specifically including a seven-level clamping module and a power supply module; the seven-level clamping module includes a first switch Sx1, a second switch Sx1', a third switch Sx2, a fourth switch Sx3, a fifth switch Sx4, a sixth switch Sx5, a seventh switch Sx5', an eighth switch Sx2', a ninth switch Sx4', a tenth switch Sx3', a first flying capacitor Cfx1, a second flying capacitor Cfx2, a first diode Dx1, and a second diode Dx2; wherein:
[0081] The drain of the first switching transistor Sx1 is electrically connected to the first port of the power module, and the source of the first switching transistor Sx1 is electrically connected to the drain of the second switching transistor Sx1'.
[0082] The drain of the second switching transistor Sx1' is electrically connected to the drain of the third switching transistor Sx2, and the source of the second switching transistor Sx1' is electrically connected to the second port of the power module.
[0083] The source of the third switch Sx2 is electrically connected to the drain of the fourth switch Sx3, and the drain of the fourth switch is electrically connected to the positive terminal of the first flying capacitor Cfx1.
[0084] The source of the fourth switch Sx3 is electrically connected to the negative terminal of the first diode Dx1, and the negative terminal of the first diode Dx1 is electrically connected to the drain of the fifth switch Sx4.
[0085] The negative terminal of the first flying capacitor Cfx1 is electrically connected to the positive terminal of the second flying capacitor Cfx2, and the positive terminal of the second flying capacitor Cfx2 is electrically connected to the positive terminal of the first diode Dx1.
[0086] The positive terminal of the first diode Dx1 is electrically connected to the negative terminal of the second diode Dx2;
[0087] The drain of the sixth switch Sx5 is electrically connected to the third port of the power module, and the source of the sixth switch Sx5 is electrically connected to the source of the eighth switch Sx2'.
[0088] The source of the eighth switch Sx2' is electrically connected to the drain of the seventh switch Sx5', and the source of the seventh switch Sx5' is electrically connected to the fourth port of the power module.
[0089] The drain of the eighth switch Sx2' is electrically connected to the source of the ninth switch Sx4', and the source of the ninth switch Sx4' is electrically connected to the negative terminal of the second flying capacitor Cfx2.
[0090] The drain of the ninth switch Sx4' is electrically connected to the source of the tenth switch Sx3', and the source of the tenth switch Sx3' is electrically connected to the positive terminal of the second diode Dx2;
[0091] The drain of the fourth switch Sx3 is electrically connected to the source of the tenth switch Sx3', and serves as the output terminal of the seven-level clamping module.
[0092] In this embodiment, the seven-level clamping module effectively reduces circuit cost and voltage stress on the four switching transistors by adding two diodes. The seven-level clamping module contains 10 switching transistors, 2 diodes, and 2 flying capacitors. The voltage stress borne by four of the switching transistors is 1 / 3 of the input bus voltage, and the voltage stress borne by the remaining eight switching transistors is 1 / 6 of the input DC bus voltage. Therefore, this embodiment effectively reduces device voltage stress, resulting in a lower cost and higher reliability for the seven-level clamping module.
[0093] In one embodiment, the power module includes a DC power supply Udc, a first DC bus capacitor Cdc1, a second DC bus capacitor Cdc2, and a third DC bus capacitor Cdc3; wherein:
[0094] The positive terminal of the first DC bus capacitor Cdc1 serves as the first port of the power module, and the negative terminal of the first DC bus capacitor Cdc1 serves as the second port of the power module.
[0095] The positive terminal of the first DC bus capacitor Cdc1 is electrically connected to one end of the positive terminal of the DC power supply Udc, and the negative terminal of the first DC bus capacitor Cdc1 is electrically connected to the positive terminal of the second DC bus capacitor Cdc2.
[0096] The negative terminal of the second DC bus capacitor Cdc2 is electrically connected to the positive terminal of the third DC bus capacitor Cdc3;
[0097] The positive terminal of the third DC bus capacitor Cdc3 serves as the third port of the power module, and the negative terminal of the third DC bus capacitor Cdc3 serves as the fourth port of the power module.
[0098] The negative terminal of the third DC bus capacitor Cdc3 is electrically connected to the negative terminal of the DC power supply Udc.
[0099] In this embodiment, the power supply module can provide voltage support for the seven-level hybrid clamp converter circuit and ensure the stability of each level output; in addition, the DC bus capacitor can effectively suppress voltage ripple and reduce harmonic distortion rate, thereby effectively improving the reliability of the circuit.
[0100] Please see Figure 2 This embodiment also provides a seven-level hybrid clamping converter system, including a power module, an A-phase circuit, a B-phase circuit, and a C-phase circuit; the A-phase circuit, B-phase circuit, and C-phase circuit are all as described in the seven-level clamping module; wherein:
[0101] The drain of the first switching transistor Sx1 in the A-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor Sx1' in the A-phase circuit is electrically connected to the second port of the power module.
[0102] The drain of the sixth switch Sx5 in the A-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch Sx5' in the A-phase circuit is electrically connected to the fourth port of the power module.
[0103] The drain of the first switching transistor Sx1 in the B-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor Sx1' in the B-phase circuit is electrically connected to the second port of the power module.
[0104] The drain of the sixth switch Sx5 in the B-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch Sx5' in the B-phase circuit is electrically connected to the fourth port of the power module.
[0105] The drain of the first switching transistor Sx1 in the C-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor Sx1' in the C-phase circuit is electrically connected to the second port of the power module.
[0106] The drain of the sixth switch Sx5 in the C-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch Sx5' in the C-phase circuit is electrically connected to the fourth port of the power module.
[0107] In this embodiment, by using a three-phase circuit with identical structure, the overall harmonic distortion rate of the circuit can be further reduced. The A-phase, B-phase, and C-phase circuits can effectively reduce harmonic components and improve circuit reliability. Furthermore, the addition of two diodes to each of the A-phase, B-phase, and C-phase circuits effectively reduces circuit cost and the voltage stress on the four switching transistors. Each of the A-phase, B-phase, and C-phase circuits contains 10 switching transistors, 2 diodes, and 2 flying capacitors. The voltage stress borne by four of the switching transistors is 1 / 3 of the input bus voltage, and the voltage stress borne by the remaining eight switching transistors is 1 / 6 of the input DC bus voltage. Therefore, this embodiment effectively reduces device voltage stress, and the A-phase, B-phase, and C-phase circuits have lower cost and higher reliability.
[0108] In one embodiment, the power module includes a DC power supply Udc, a first DC bus capacitor Cdc1, a second DC bus capacitor Cdc2, and a third DC bus capacitor Cdc3; wherein:
[0109] The positive terminal of the first DC bus capacitor Cdc1 serves as the first port of the power module, and the negative terminal of the first DC bus capacitor Cdc1 serves as the second port of the power module.
[0110] The positive terminal of the first DC bus capacitor Cdc1 is electrically connected to one end of the positive terminal of the DC power supply Udc, and the negative terminal of the first DC bus capacitor Cdc1 is electrically connected to the positive terminal of the second DC bus capacitor Cdc2.
[0111] The negative terminal of the second DC bus capacitor Cdc2 is electrically connected to the positive terminal of the third DC bus capacitor Cdc3;
[0112] The positive terminal of the third DC bus capacitor Cdc3 serves as the third port of the power module, and the negative terminal of the third DC bus capacitor Cdc3 serves as the fourth port of the power module.
[0113] The negative terminal of the third DC bus capacitor Cdc3 is electrically connected to the negative terminal of the DC power supply Udc.
[0114] In this embodiment, the power supply module can provide voltage support for the seven-level hybrid clamp converter circuit and ensure the stability of each level output; in addition, the DC bus capacitor can effectively suppress voltage ripple and reduce harmonic distortion rate, thereby effectively improving the reliability of the circuit.
[0115] This embodiment also provides a seven-level hybrid clamp converter switching control method, applied to the aforementioned seven-level hybrid clamp converter circuit, which controls the magnitude of the output voltage of the seven-level clamp module by changing the switching state of the seven-level clamp module; including:
[0116] When the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the fifth switch Sx4, and the sixth switch Sx5 are closed, and the second switch Sx1', the seventh switch Sx5', the eighth switch Sx2', the ninth switch Sx4', and the tenth switch Sx3' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0117] When the second switch Sx1', the seventh switch Sx5', the eighth switch Sx2', the ninth switch Sx4', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the fifth switch Sx4, and the sixth switch Sx5 are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0118] In one embodiment, when the first switch Sx1, the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0119] When the first switch Sx1, the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0120] In one embodiment, when the first switch Sx1, the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0121] When the first switch Sx1, the fourth switch Sx3, the fifth switch Sx4, the sixth switch Sx5, and the eighth switch Sx2' are closed, and the second switch Sx1', the third switch Sx2, the seventh switch Sx5', the ninth switch Sx4', and the tenth switch Sx3' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0122] In one embodiment, when the second switch Sx1', the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0123] When the second switch Sx1', the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0124] When the second switch Sx1', the fifth switch Sx4, the sixth switch Sx5, the eighth switch Sx2', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the seventh switch Sx5', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0125] When the second switch Sx1', the fifth switch Sx4, the sixth switch Sx5, the eighth switch Sx2', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the seventh switch Sx5', and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0126] In one embodiment, when the second switch Sx1', the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply Udc.
[0127] When the second switch Sx1', the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are closed, and the first switch Sx1, the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are open, both the first diode Dx1 and the second diode Dx2 are not conducting. The output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply Udc.
[0128] In one embodiment, when the second switch Sx1', the fifth switch Sx4, the eighth switch Sx2', the seventh switch Sx5', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the sixth switch Sx5, and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0129] When the second switch Sx1', the fifth switch Sx4, the eighth switch Sx2', the seventh switch Sx5', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the sixth switch Sx5, and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0130] In this embodiment, by controlling the states of the first switch Sx1, the second switch Sx1', the third switch Sx2, the fourth switch Sx3, the fifth switch Sx4, the sixth switch Sx5, the seventh switch Sx5', the eighth switch Sx2', the ninth switch Sx4', and the tenth switch Sx3', the magnitude of the output voltage of the seven-level clamping module and the conduction status of the first diode Dx1 and the second diode Dx2 can be effectively adjusted; wherein, the drive signals of the first switch Sx1 and the second switch Sx1' are complementary, and the third switch Sx5'... The drive signals of Sx2 and the eighth switch Sx2' are complementary; the drive signals of the fourth switch Sx3 and the ninth switch Sx4' are complementary; the drive signals of the fifth switch Sx4 and the tenth switch Sx3' are complementary; and the drive signals of the sixth switch Sx5 and the seventh switch Sx5' are complementary. By dynamically adjusting the output voltage of the seven-level clamping module and the conduction status of the first diode Dx1 and the second diode Dx2, the output harmonic distortion rate and the voltage stress of the devices can be effectively reduced, while the switching element losses can be reduced.
[0131] To more clearly illustrate the seven-level hybrid clamp converter system provided in the above embodiments, and the switching control method applied to the seven-level hybrid clamp converter circuit, and to highlight its technical advantages, a practical example is used below for illustration.
[0132] In the seven-level hybrid clamp converter system, the drive signals of the first switch Sx1 and the second switch Sx1' of the A-phase circuit are complementary, the drive signals of the third switch Sx2 and the eighth switch Sx2' are complementary, the drive signals of the fourth switch Sx3 and the tenth switch Sx3' are complementary, the drive signals of the fifth switch Sx4 and the ninth switch Sx4' are complementary, and the drive signals of the sixth switch Sx5 and the seventh switch Sx5' are complementary.
[0133] The drive signals of the first switch Sx1 and the second switch Sx1' of the B-phase circuit are complementary; the drive signals of the third switch Sx2 and the eighth switch Sx2' are complementary; the drive signals of the fourth switch Sx3 and the tenth switch Sx3' are complementary; the drive signals of the fifth switch Sx4 and the ninth switch Sx4' are complementary; and the drive signals of the sixth switch Sx5 and the seventh switch Sx5' are complementary.
[0134] The drive signals of the first switch Sx1 and the second switch Sx1' of the C-phase circuit are complementary, the drive signals of the third switch Sx2 and the eighth switch Sx2' are complementary, the drive signals of the fourth switch Sx3 and the tenth switch Sx3' are complementary, the drive signals of the fifth switch Sx4 and the ninth switch Sx4' are complementary, and the drive signals of the sixth switch Sx5 and the seventh switch Sx5' are complementary.
[0135] Please see Figure 3 When the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the fifth switch Sx4, and the sixth switch Sx5 are closed, and the second switch Sx1', the seventh switch Sx5', the eighth switch Sx2', the ninth switch Sx4', and the tenth switch Sx3' are open, the first diode Dx1 and the second diode Dx2 are not conducting. At this time, regardless of whether current flows out or in, the first flying capacitor Cfx1 and the second flying capacitor Cfx2 are unaffected, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0136] Please see Figure 4 (a) When the first switch Sx1, the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, the first flying capacitor Cfx1 enters the charging state, the second flying capacitor Cfx2 is unaffected, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0137] Please see Figure 4 (b) When the first switch Sx1, the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, the first flying capacitor Cfx1 enters the discharge state, the second flying capacitor Cfx2 is unaffected, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0138] Please see Figure 5(a) When the first switch Sx1, the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are closed, and the second switch Sx1', the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are open, the first diode Dx1 and the second diode Dx2 are both not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0139] When current flows out from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the charging state; when current flows in from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the discharging state.
[0140] Please see Figure 5 (b) When the first switch Sx1, the fourth switch Sx3, the fifth switch Sx4, the sixth switch Sx5, and the eighth switch Sx2' are closed, and the second switch Sx1', the third switch Sx2, the seventh switch Sx5', the ninth switch Sx4', and the tenth switch Sx3' are open, the first diode Dx1 and the second diode Dx2 are both not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0141] When current flows out from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the discharge state; when current flows in from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the charging state.
[0142] Please see Figure 6 (a) When the second switch Sx1', the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, the first flying capacitor Cfx1 enters the charging state, the second flying capacitor Cfx2 is unaffected, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0143] Please see Figure 6(b) When the second switch Sx1', the third switch Sx2, the fifth switch Sx4, the sixth switch Sx5, and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the seventh switch Sx5', the eighth switch Sx2', and the ninth switch Sx4' are open, and current flows in from the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, the first flying capacitor Cfx1 enters the discharge state, the second flying capacitor Cfx2 is unaffected, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0144] Please see Figure 6 (c) When the second switch Sx1', the fifth switch Sx4, the sixth switch Sx5, the eighth switch Sx2', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the seventh switch Sx5', and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, the first flying capacitor Cfx1 is unaffected, the second flying capacitor Cfx2 enters the discharge state, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0145] Please see Figure 6 (d) When the second switch Sx1', the fifth switch Sx4, the sixth switch Sx5, the eighth switch Sx2', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the seventh switch Sx5', and the ninth switch Sx4' are open, and current flows in from the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, the first flying capacitor Cfx1 is unaffected, the second flying capacitor Cfx2 enters the charging state, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply Udc.
[0146] Please see Figure 7 (a) When the second switch Sx1', the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are closed, and the first switch Sx1, the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0147] When current flows out from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the charging state; when current flows in from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the discharging state.
[0148] Please see Figure 7 (b) When the second switch Sx1', the fourth switch Sx3, the fifth switch Sx4, the seventh switch Sx5', and the eighth switch Sx2' are closed, and the first switch Sx1, the third switch Sx2, the sixth switch Sx5, the ninth switch Sx4', and the tenth switch Sx3' are open, both the first diode Dx1 and the second diode Dx2 are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply Udc.
[0149] When current flows out from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the discharge state; when current flows in from the output terminal of the seven-level clamping module, both the first flying capacitor Cfx1 and the second flying capacitor Cfx2 enter the charging state.
[0150] Please see Figure 8 (a) When the second switch Sx1', the fifth switch Sx4, the seventh switch Sx5', the eighth switch Sx2', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the sixth switch Sx5, and the ninth switch Sx4' are open, and current flows out from the output terminal of the seven-level clamping module, the first diode Dx1 is turned on, the second diode Dx2 is turned off, the first flying capacitor Cfx1 is unaffected, and the second flying capacitor Cfx2 enters the discharge state. The output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0151] Please see Figure 8 (b) When the second switch Sx1', the fifth switch Sx4, the eighth switch Sx2', the seventh switch Sx5', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the sixth switch Sx5, and the ninth switch Sx4' are open, and current flows into the output terminal of the seven-level clamping module, the first diode Dx1 is cut off, the second diode Dx2 is turned on, the first flying capacitor Cfx1 is unaffected, and the second flying capacitor Cfx2 enters the charging state. The output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0152]
[0153] Please see Figure 9 When the second switch Sx1', the seventh switch Sx5', the eighth switch Sx2', the ninth switch Sx4', and the tenth switch Sx3' are closed, and the first switch Sx1, the third switch Sx2, the fourth switch Sx3, the fifth switch Sx4, and the sixth switch Sx5 are open, the first diode Dx1 and the second diode Dx2 are not conducting. At this time, regardless of whether current flows out or in, the first flying capacitor Cfx1 and the second flying capacitor Cfx2 are unaffected, and the output voltage of the seven-level clamping module is the magnitude of the DC power supply Udc.
[0154] Furthermore, the schematic diagrams in the above embodiments are for illustrating the circuit's operational path in this state. The faded portion of the circuit in the diagrams indicates that the component is in a non-conductive state.
[0155] The seven-level hybrid clamp converter proposed in the above embodiment effectively reduces circuit cost and voltage stress on the four switching transistors by adding two diodes. The seven-level clamp module contains 10 switching transistors, 2 diodes, and 2 flying capacitors. The voltage stress borne by four switching transistors is 1 / 3 of the input bus voltage, and the voltage stress borne by the remaining eight switching transistors is 1 / 6 of the input DC bus voltage. Therefore, the above embodiment effectively reduces device voltage stress, and the seven-level clamp module has lower cost and higher reliability.
[0156] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.
Claims
1. A seven-level hybrid clamping converter circuit, characterized in that, Specifically, it includes a seven-level clamping module and a power supply module; the seven-level clamping module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, a first flying capacitor, a second flying capacitor, a first diode, and a second diode; wherein: The drain of the first switching transistor is electrically connected to the first port of the power module, and the source of the first switching transistor is electrically connected to the drain of the second switching transistor. The drain of the second switching transistor is electrically connected to the drain of the third switching transistor, and the source of the second switching transistor is electrically connected to the second port of the power module. The source of the third switch is electrically connected to the drain of the fourth switch, and the drain of the fourth switch is electrically connected to the positive terminal of the first flying capacitor. The source of the fourth switch is electrically connected to the negative terminal of the first diode, and the negative terminal of the first diode is electrically connected to the drain of the fifth switch. The negative terminal of the first flying capacitor is electrically connected to the positive terminal of the second flying capacitor, and the positive terminal of the second flying capacitor is electrically connected to the positive terminal of the first diode. The positive terminal of the first diode is electrically connected to the negative terminal of the second diode; The drain of the sixth switch is electrically connected to the third port of the power module, and the source of the sixth switch is electrically connected to the source of the eighth switch. The source of the eighth switch is electrically connected to the drain of the seventh switch, and the source of the seventh switch is electrically connected to the fourth port of the power module. The drain of the eighth switch is electrically connected to the source of the ninth switch, and the source of the ninth switch is electrically connected to the negative terminal of the second flying capacitor. The drain of the ninth switch is electrically connected to the source of the tenth switch, and the source of the tenth switch is electrically connected to the positive terminal of the second diode. The drain of the fourth switch is electrically connected to the source of the tenth switch and serves as the output of the seven-level clamping module.
2. The seven-level hybrid clamp converter circuit according to claim 1, characterized in that, The power module includes a DC power supply, a first DC bus capacitor, a second DC bus capacitor, and a third DC bus capacitor; wherein: The positive terminal of the first DC bus capacitor serves as the first port of the power module, and the negative terminal of the first DC bus capacitor serves as the second port of the power module. The positive terminal of the first DC bus capacitor is electrically connected to one end of the positive terminal of the DC power supply, and the negative terminal of the first DC bus capacitor is electrically connected to the positive terminal of the second DC bus capacitor. The negative terminal of the second DC bus capacitor is electrically connected to the positive terminal of the third DC bus capacitor; The positive terminal of the third DC bus capacitor serves as the third port of the power module, and the negative terminal of the third DC bus capacitor serves as the fourth port of the power module. The negative terminal of the third DC bus capacitor is electrically connected to the negative terminal of the DC power supply.
3. A seven-level hybrid clamp converter system, characterized in that, It includes a power supply module, an A-phase circuit, a B-phase circuit, and a C-phase circuit; wherein the A-phase circuit, B-phase circuit, and C-phase circuit are all seven-level clamping modules as described in claim 1 or 2; wherein: The drain of the first switching transistor in phase A circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in phase A circuit is electrically connected to the second port of the power module. The drain of the sixth switch transistor in phase A circuit is electrically connected to the third port of the power module, and the source of the seventh switch transistor in phase A circuit is electrically connected to the fourth port of the power module. The drain of the first switching transistor in the B-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in the B-phase circuit is electrically connected to the second port of the power module. The drain of the sixth switch in the B-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch in the B-phase circuit is electrically connected to the fourth port of the power module. The drain of the first switching transistor in the C-phase circuit is electrically connected to the first port of the power module, and the source of the second switching transistor in the C-phase circuit is electrically connected to the second port of the power module. The drain of the sixth switch in the C-phase circuit is electrically connected to the third port of the power module, and the source of the seventh switch in the C-phase circuit is electrically connected to the fourth port of the power module.
4. A seven-level hybrid clamp converter system according to claim 3, characterized in that, The power module includes a DC power supply, a first DC bus capacitor, a second DC bus capacitor, and a third DC bus capacitor; wherein: The positive terminal of the first DC bus capacitor serves as the first port of the power module, and the negative terminal of the first DC bus capacitor serves as the second port of the power module. The positive terminal of the first DC bus capacitor is electrically connected to one end of the positive terminal of the DC power supply, and the negative terminal of the first DC bus capacitor is electrically connected to the positive terminal of the second DC bus capacitor. The negative terminal of the second DC bus capacitor is electrically connected to the positive terminal of the third DC bus capacitor; The positive terminal of the third DC bus capacitor serves as the third port of the power module, and the negative terminal of the third DC bus capacitor serves as the fourth port of the power module. The negative terminal of the third DC bus capacitor is electrically connected to the negative terminal of the DC power supply.
5. A switching control method for a seven-level hybrid clamping converter, characterized in that, Applied to a seven-level hybrid clamping converter circuit as described in claim 1 or 2, the magnitude of the output voltage of the seven-level clamping module is controlled by changing the switching state of the seven-level clamping module; comprising: When the first, third, fourth, fifth, and sixth switches are closed, and the second, seventh, eighth, ninth, and tenth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage. When the second, seventh, eighth, ninth, and tenth switches are closed, and the first, third, fourth, fifth, and sixth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
6. The seven-level hybrid clamp converter switching control method according to claim 5, characterized in that, Also includes: When the first, third, fifth, sixth, and tenth switches are closed, and the second, fourth, seventh, eighth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode conducts, the second diode is cut off, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage. When the first, third, fifth, sixth, and tenth switches are closed, and the second, fourth, seventh, eighth, and ninth switches are open, and current flows into the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
7. The seven-level hybrid clamp converter switching control method according to claim 5, characterized in that, Also includes: When the first, third, sixth, ninth, and tenth switches are closed, and the second, fourth, fifth, seventh, and eighth switches are open, neither the first nor the second diode is conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage. When the first, fourth, fifth, sixth, and eighth switches are closed, and the second, third, seventh, ninth, and tenth switches are open, both the first and second diodes are not conducting, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
8. The seven-level hybrid clamp converter switching control method according to claim 5, characterized in that, Also includes: When the second, third, fifth, sixth, and tenth switches are closed, and the first, fourth, seventh, eighth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode is turned on, the second diode is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply. When the second, third, fifth, sixth, and tenth switches are closed, and the first, fourth, seventh, eighth, and ninth switches are open, and current flows in from the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply. When the second, fifth, sixth, eighth, and tenth switches are closed, and the first, third, fourth, seventh, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode is turned on, the second diode is turned off, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply. When the second, fifth, sixth, eighth, and tenth switches are closed, and the first, third, fourth, seventh, and ninth switches are open, and current flows in from the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is 0, which is the voltage of the DC power supply.
9. The seven-level hybrid clamp converter switching control method according to claim 5, characterized in that, Also includes: When the second, third, sixth, ninth, and tenth switches are closed, and the first, fourth, fifth, seventh, and eighth switches are open, both the first and second diodes are not conducting. The output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage. When the second, fourth, fifth, seventh, and eighth switches are closed, and the first, third, sixth, ninth, and tenth switches are open, both the first and second diodes are not conducting. The output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.
10. The seven-level hybrid clamp converter switching control method according to claim 5, characterized in that, Also includes: When the second, fifth, eighth, seventh, and tenth switches are closed, and the first, third, fourth, sixth, and ninth switches are open, and current flows out from the output terminal of the seven-level clamping module, the first diode conducts, the second diode is cut off, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage. When the second, fifth, eighth, seventh, and tenth switches are closed, and the first, third, fourth, sixth, and ninth switches are open, and current flows into the output terminal of the seven-level clamping module, the first diode is cut off, the second diode is turned on, and the output voltage of the seven-level clamping module is equal to the magnitude of the DC power supply voltage.