Dead-time free three-level topology circuit

Abstract

The embodiment of the present application provides a kind of dead zone-free three-level topology circuit, belong to power electronics technical field.The topology circuit includes: first DC power supply, second DC power supply, first controllable switch, second controllable switch, third controllable switch, fourth controllable switch, fifth controllable switch, sixth controllable switch, first anti-straight-through inductance, second anti-straight-through inductance, AC side load and controller, the controller is connected with the first controllable switch, second controllable switch, third controllable switch, fourth controllable switch, fifth controllable switch and sixth controllable switch, for determining control signal according to the input level of input terminal and the demand level of output terminal.The topology circuit eliminates the problem of bridge arm straight-through, without adding dead zone in the driving signal of bridge arm switch power tube, so as to improve the quality of bridge arm output electric energy.

Description

Technical Field

[0001] This invention relates to the field of power electronics technology, and more specifically to a dead-zone-free three-level topology circuit. Background Technology

[0002] Three-level is a commonly used power inverter topology for converting direct current (DC) to alternating current (AC). In a three-level topology, the power switches of each half-bridge inverter can be turned on and off independently, resulting in three distinct output levels: positive, negative, and zero. The positive level is formed by the upper transistor of the upper half-bridge inverter being on and the lower transistor of the lower half-bridge inverter being on; the negative level is formed by the lower transistor of the upper half-bridge inverter being on and the upper transistor of the lower half-bridge inverter being on; and the zero level is formed when both transistors of the two half-bridge inverters are off. By switching between positive and negative levels, the three-level topology can generate an output voltage waveform that approximates an ideal sine wave. Compared to the traditional two-level topology, the three-level topology exhibits lower total harmonic distortion (THD) and higher output quality, thus enabling more efficient and accurate power conversion. It is widely used in industrial drives, electric vehicles, and renewable energy applications.

[0003] Traditional three-level topologies suffer from shoot-through issues in the bridge arms. This leads to unnecessary energy waste and overload of the power switches, while also increasing power system losses and heat. To address this issue, a dead time needs to be added to the drive signal of the bridge arm switching power transistors. However, the dead time introduces low-order harmonics into the bridge arm output voltage, reducing the power quality of the bridge arm output. Summary of the Invention

[0004] The purpose of this invention is to provide a dead-time-free three-level topology circuit, which can eliminate the shoot-through problem of the bridge arm and eliminate the need to add a dead time to the drive signal of the bridge arm switching power transistor, thereby improving the output power quality of the bridge arm.

[0005] To achieve the above objectives, embodiments of the present invention provide a dead-time-free three-level topology circuit, the topology circuit comprising:

[0006] First DC power supply;

[0007] The second DC power supply is connected in series with the first DC power supply.

[0008] A first controllable switch, one end of which is connected to the positive terminal of the first DC power supply;

[0009] A second controllable switch, one end of which is connected to the positive terminal of the first DC power supply;

[0010] A third controllable switch, one end of which is connected to the negative terminal of the first DC power supply, and the other end of which is connected to the other end of the first controllable switch;

[0011] A fourth controllable switch, one end of the third controllable switch is connected to the negative terminal of the first DC power supply, and the other end of the fourth controllable switch is connected to the other end of the second controllable switch;

[0012] A fifth controllable switch, one end of which is connected to the negative terminal of the second DC power supply, and the other end of which is connected to the other end of the third controllable switch;

[0013] A sixth controllable switch, one end of which is connected to the negative terminal of the second DC power supply, and the other end of which is connected to the other end of the fourth controllable switch;

[0014] The first anti-straight-through inductor has one end connected to the other end connection point of the first controllable switch, the third controllable switch and the fifth controllable switch;

[0015] The second anti-straight-through inductor has one end connected to the other end connection point of the second controllable switch, the fourth controllable switch and the sixth controllable switch, and one end of the second anti-straight-through inductor is connected to the other end of the first anti-straight-through inductor.

[0016] An AC-side load, one end of which is connected to the connection point of the first anti-short-circuit inductor and the second anti-short-circuit inductor, and the other end of which is connected to the connection point of the first DC power supply and the second DC power supply.

[0017] The controller, connected to the first, second, third, fourth, fifth, and sixth controllable switches, is used to determine the control signal based on the input level at the input terminal and the required level at the output terminal.

[0018] Optionally, the controller is used to:

[0019] When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor;

[0020] When the required level is positive, a level signal indicating closure is sent to the first controllable switch, a level signal indicating opening or closure is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch.

[0021] When the required level is positive, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is closed is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

[0022] Optionally, the controller is used to:

[0023] When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor;

[0024] When the required level is 0, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is closed is sent to the third controllable switch, a level signal indicating that the switch is open or closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

[0025] When the required level is 0, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

[0026] Optionally, the controller is used to:

[0027] When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor;

[0028] When the required level is negative, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is closed is sent to the fifth controllable switch, and a level signal indicating that the switch is open or closed is sent to the sixth controllable switch.

[0029] When the required level is negative, a level signal indicating that the switch is open is sent to the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch.

[0030] Optionally, the controller is used to:

[0031] When the input terminal is the other end of the first anti-straight-through inductor, determine the instantaneous value of the AC voltage at the other end of the first anti-straight-through inductor;

[0032] Determine whether the instantaneous value of the AC voltage is greater than a preset first voltage threshold;

[0033] If it is determined that the instantaneous value of the AC voltage is greater than the first voltage threshold, a level signal indicating closure is sent to the first controllable switch, a level signal indicating opening is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch.

[0034] When the instantaneous value of the AC voltage is determined to be equal to the first voltage threshold, a level signal indicating closure is sent to the first controllable switch, a level signal indicating closure is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch.

[0035] Optionally, the controller is further configured to:

[0036] If it is determined that the instantaneous value of the AC voltage is less than the first voltage threshold, then it is determined whether the instantaneous value of the AC voltage is greater than a preset second voltage threshold;

[0037] If the instantaneous value of the AC voltage is determined to be less than the first voltage threshold and greater than the second voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is closed is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

[0038] When the instantaneous value of the AC voltage is determined to be equal to the second voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is closed is sent to the third controllable switch, a level signal indicating that the switch is closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

[0039] Optionally, the controller is used to:

[0040] If it is determined that the instantaneous value of the AC voltage is less than the second voltage threshold, then it is determined whether the instantaneous value of the AC voltage is greater than a preset third voltage threshold.

[0041] If the instantaneous value of the AC voltage is determined to be less than the second voltage threshold and greater than the third voltage threshold, an open signal is sent to the first controllable switch, an open signal is sent to the second controllable switch, an open signal is sent to the third controllable switch, an open signal is sent to the fourth controllable switch, an open signal is sent to the fifth controllable switch, and an closed signal is sent to the sixth controllable switch.

[0042] When the instantaneous value of the AC voltage is determined to be equal to the third voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is closed is sent to the fifth controllable switch, and a level signal indicating that the switch is closed is sent to the sixth controllable switch.

[0043] If the instantaneous value of the AC voltage is determined to be less than the third voltage threshold, an indicator signal to open is sent to the first controllable switch, an indicator signal to open is sent to the second controllable switch, an indicator signal to open is sent to the third controllable switch, an indicator signal to open is sent to the fourth controllable switch, an indicator signal to close is sent to the fifth controllable switch, and an indicator signal to open is sent to the sixth controllable switch.

[0044] Optionally, the controller is used to:

[0045] The bridge arm output voltage is determined according to formula (1).

[0046] U B =(S1+S2)U P +(S3+S4)U O +(S5+S6)U N -(S1∧S2)U P -(S3∧S4)U O -(S5∧S6)U N (1)

[0047] Among them, U B S1 is the switching signal controlling the first controllable switch, S2 is the switching signal controlling the second controllable switch, S3 is the switching signal controlling the third controllable switch, S4 is the switching signal controlling the fourth controllable switch, S5 is the switching signal controlling the fifth controllable switch, and S6 is the switching signal controlling the sixth controllable switch. U P For a positive voltage, U O When the voltage is 0, U N ∧ represents negative voltage and is the AND operator.

[0048] Through the above technical solution, the dead-time-free three-level topology circuit provided by the present invention uses two anti-shoo-through inductors, namely the first anti-shoo-through inductor and the second anti-shoo-through inductor, to combine the current of the switching branches corresponding to the same polarity current, thereby eliminating the shoot-through problem of the bridge arm and eliminating the need to add a dead time to the drive signal of the bridge arm switching power transistor, thus improving the output power quality of the bridge arm.

[0049] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0050] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0051] Figure 1 This is a schematic diagram of a dead-zone-free three-level topology circuit according to an embodiment of the present invention;

[0052] Figure 2 This is a switch sequence list of a dead-zone-free three-level topology circuit according to an embodiment of the present invention;

[0053] Figure 3 This is a switching logic table for generating AC current in a dead-zone-free three-level topology circuit according to an embodiment of the present invention.

[0054] Figure 4 This is a switching logic table for generating DC current in a dead-zone-free three-level topology circuit according to an embodiment of the present invention.

[0055] Explanation of reference numerals in the attached figures

[0056] DC1, First DC power supply; DC2, Second DC power supply

[0057] S1, first controllable switch; S2, second controllable switch

[0058] S3, third controllable switch; S4, fourth controllable switch

[0059] S5, fifth controllable switch; S6, sixth controllable switch

[0060] L1, first anti-straight-through inductor; L2, second anti-straight-through inductor.

[0061] AC, AC side load P, power supply positive terminal

[0062] O, power connection point N, negative power terminal

[0063] B1, first switch group connection point; B2, second switch group connection point. Detailed Implementation

[0064] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0065] like Figure 1 The diagram shown is a schematic representation of a dead-zone-free three-level topology circuit according to an embodiment of the present invention. Figure 1The topology circuit may include a first DC power supply DC1, a second DC power supply DC2, a first controllable switch S1, a second controllable switch S2, a third controllable switch S3, a fourth controllable switch S4, a fifth controllable switch S5, a sixth controllable switch S6, a first anti-surge inductor L1, a second anti-surge inductor L2, an AC-side load AC, and a controller. The second DC power supply DC2 is connected in series with the first DC power supply DC1. One end of the first controllable switch S1 is connected to the positive terminal of the first DC power supply DC1, and one end of the second controllable switch S2 is also connected to the positive terminal of the first DC power supply DC1. One end of the third controllable switch S3 is connected to the negative terminal of the first DC power supply DC1, and the other end of the third controllable switch S3 is connected to the other end of the first controllable switch S1. One end of the third controllable switch S3 is also connected to the negative terminal of the first DC power supply DC1, and the other end of the fourth controllable switch S4 is connected to the other end of the second controllable switch S2. One end of the fifth controllable switch S5 is connected to the negative terminal of the second DC power supply DC2, and the other end of the fifth controllable switch S5 is connected to the other end of the third controllable switch S3. One end of the sixth controllable switch S6 is connected to the negative terminal of the second DC power supply DC2, and the other end of the sixth controllable switch S6 is connected to the other end of the fourth controllable switch S4. One end of the first anti-surge inductor L1 is connected to the connection point of the other ends of the first controllable switch S1, the third controllable switch S3, and the fifth controllable switch S5. One end of the second anti-surge inductor L2 is connected to the connection point of the other ends of the second controllable switch S2, the fourth controllable switch S4, and the sixth controllable switch S6, and one end of the second anti-surge inductor L2 is connected to the other end of the first anti-surge inductor L1. One end of the AC load AC is connected to the connection point of the first anti-surge inductor L1 and the second anti-surge inductor L2, and the other end of the AC load AC is connected to the connection point of the first DC power supply DC1 and the second DC power supply DC2. The controller is connected to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6, and is used to determine the control signal based on the input level at the input terminal and the required level at the output terminal.

[0066] With the input terminal being one of the first, third, and fifth controllable switches, in order to output a positive level, in one embodiment of the present invention, the controller can be used to:

[0067] When the input terminal is one end of the first controllable switch S1, the third controllable switch S3, and the fifth controllable switch S5, determine the required level of the other end of the first anti-straight-through inductor L1;

[0068] When the required level is positive, a level signal indicating closure is sent to the first controllable switch S1, a level signal indicating opening or closing is sent to the second controllable switch S2, a level signal indicating opening is sent to the third controllable switch S3, a level signal indicating opening is sent to the fourth controllable switch S4, a level signal indicating opening is sent to the fifth controllable switch S5, and a level signal indicating opening is sent to the sixth controllable switch S6.

[0069] When the required voltage level is positive, a signal indicating that the switch is open is sent to the first controllable switch S1, a signal indicating that the switch is closed is sent to the second controllable switch S2, a signal indicating that the switch is open is sent to the third controllable switch S3, a signal indicating that the switch is open is sent to the fourth controllable switch S4, a signal indicating that the switch is open is sent to the fifth controllable switch S5, and a signal indicating that the switch is open is sent to the sixth controllable switch S6. Figure 2 and Figure 3 As shown.

[0070] With the input terminals being one of the first, third, and fifth controllable switches, in order to output a 0 level, in one embodiment of the present invention, the controller can be used to:

[0071] When the input terminal is one end of the first controllable switch S1, the third controllable switch S3, and the fifth controllable switch S5, determine the required level of the other end of the first anti-straight-through inductor L1;

[0072] When the required level is 0, a level signal indicating that the switch is open is sent to the first controllable switch S1, a level signal indicating that the switch is open is sent to the second controllable switch S2, a level signal indicating that the switch is closed is sent to the third controllable switch S3, a level signal indicating that the switch is open or closed is sent to the fourth controllable switch S4, a level signal indicating that the switch is open is sent to the fifth controllable switch S5, and a level signal indicating that the switch is open is sent to the sixth controllable switch S6.

[0073] When the required level is 0, a signal indicating that the switch is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0074] With the input terminal being one of the first, third, and fifth controllable switches, in order to output a negative level, in one embodiment of the present invention, the controller can be used to:

[0075] When the input terminal is one end of the first controllable switch S1, the third controllable switch S3, and the fifth controllable switch S5, determine the required level of the other end of the first anti-straight-through inductor L1;

[0076] When the required level is negative, a level signal indicating that the switch is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0077] When the required level is negative, a signal indicating that the switch is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0078] With the input terminal being the other end of the first anti-shot inductor, in order to output a DC voltage, in one embodiment of the invention, the controller can be used to:

[0079] When the input terminal is the other end of the first anti-straight-through inductor L1, determine the instantaneous value of the AC voltage at the other end of the first anti-straight-through inductor L1;

[0080] Determine whether the instantaneous value of the AC voltage is greater than a preset first voltage threshold;

[0081] When the instantaneous value of the AC voltage is determined to be greater than the first voltage threshold, a level signal indicating closure is sent to the first controllable switch S1, a level signal indicating opening is sent to the second controllable switch S2, a level signal indicating opening is sent to the third controllable switch S3, a level signal indicating opening is sent to the fourth controllable switch S4, a level signal indicating opening is sent to the fifth controllable switch S5, and a level signal indicating opening is sent to the sixth controllable switch S6.

[0082] When the instantaneous value of the AC voltage is determined to be equal to the first voltage threshold, a level signal indicating closure is sent to the first controllable switch S1, a level signal indicating closure is sent to the second controllable switch S2, a level signal indicating opening is sent to the third controllable switch S3, a level signal indicating opening is sent to the fourth controllable switch S4, a level signal indicating opening is sent to the fifth controllable switch S5, and a level signal indicating opening is sent to the sixth controllable switch S6. Figure 4 As shown.

[0083] With the input terminal being the other end of the first anti-shot inductor, in order to output a DC voltage, in one embodiment of the invention, the controller can be used to:

[0084] If the instantaneous value of the AC voltage is determined to be less than the first voltage threshold, then it is determined whether the instantaneous value of the AC voltage is greater than the preset second voltage threshold.

[0085] When it is determined that the instantaneous value of the AC voltage is less than the first voltage threshold and greater than the second voltage threshold, a level signal indicating that it is open is sent to the first controllable switch S1, a level signal indicating that it is closed is sent to the second controllable switch S2, a level signal indicating that it is open is sent to the third controllable switch S3, a level signal indicating that it is open is sent to the fourth controllable switch S4, a level signal indicating that it is open is sent to the fifth controllable switch S5, and a level signal indicating that it is open is sent to the sixth controllable switch S6.

[0086] When the instantaneous value of the AC voltage is determined to be equal to the second voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch S1, a level signal indicating that the switch is open is sent to the second controllable switch S2, a level signal indicating that the switch is closed is sent to the third controllable switch S3, a level signal indicating that the switch is closed is sent to the fourth controllable switch S4, a level signal indicating that the switch is open is sent to the fifth controllable switch S5, and a level signal indicating that the switch is open is sent to the sixth controllable switch S6.

[0087] With the input terminal being the other end of the first anti-shot inductor, in order to output a DC voltage, in one embodiment of the invention, the controller can be used to:

[0088] If the instantaneous value of the AC voltage is determined to be less than the second voltage threshold, then determine whether the instantaneous value of the AC voltage is greater than the preset third voltage threshold.

[0089] When it is determined that the instantaneous value of the AC voltage is less than the second voltage threshold and greater than the third voltage threshold, a level signal indicating that it is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0090] When the instantaneous value of the AC voltage is determined to be equal to the third voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0091] If the instantaneous value of the AC voltage is determined to be less than the third voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch S1, the second controllable switch S2, the third controllable switch S3, the fourth controllable switch S4, the fifth controllable switch S5, and the sixth controllable switch S6.

[0092] Furthermore, when the input terminal is one end of the first controllable switch S1, the third controllable switch S3, or the fifth controllable switch S5, the controller can also be used for:

[0093] The bridge arm output voltage is determined according to formula (1).

[0094] U B =(S1+S2)U P +(S3+S4)U O +(S5+S6)U N -(S1∧S2)U P -(S3∧S4)U O -(S5∧S6)U N (1)

[0095] Among them, U B For the bridge arm output voltage, S1 is the switching signal controlling the first controllable switch S1, S2 is the switching signal controlling the second controllable switch S2, S3 is the switching signal controlling the third controllable switch S3, S4 is the switching signal controlling the fourth controllable switch S4, S5 is the switching signal controlling the fifth controllable switch S5, and S6 is the switching signal controlling the sixth controllable switch S6. U P For a positive voltage, U O When the voltage is 0, U N ∧ represents negative voltage and is the AND operator.

[0096] Through the above technical solution, the dead-time-free three-level topology circuit provided by the present invention uses two anti-shoo-through inductors, namely the first anti-shoo-through inductor and the second anti-shoo-through inductor, to combine the current of the switching branches corresponding to the same polarity current, thereby eliminating the shoot-through problem of the bridge arm and eliminating the need to add a dead time to the drive signal of the bridge arm switching power transistor, thus improving the output power quality of the bridge arm.

[0097] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0098] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A dead-time-free three-level topology circuit, characterized in that, The topology circuit includes: First DC power supply; The second DC power supply is connected in series with the first DC power supply. A first controllable switch, one end of which is connected to the positive terminal of the first DC power supply; A second controllable switch, one end of which is connected to the positive terminal of the first DC power supply; A third controllable switch, one end of which is connected to the negative terminal of the first DC power supply, and the other end of which is connected to the other end of the first controllable switch; A fourth controllable switch, one end of which is connected to the negative terminal of the first DC power supply, and the other end of which is connected to the other end of the second controllable switch; A fifth controllable switch, one end of which is connected to the negative terminal of the second DC power supply, and the other end of which is connected to the other end of the third controllable switch; A sixth controllable switch, one end of which is connected to the negative terminal of the second DC power supply, and the other end of which is connected to the other end of the fourth controllable switch; The first anti-straight-through inductor has one end connected to the other end connection point of the first controllable switch, the third controllable switch and the fifth controllable switch; The second anti-straight-through inductor has one end connected to the other end connection point of the second controllable switch, the fourth controllable switch and the sixth controllable switch, and one end of the second anti-straight-through inductor is connected to the other end of the first anti-straight-through inductor. An AC-side load, one end of which is connected to the connection point of the first anti-short-circuit inductor and the second anti-short-circuit inductor, and the other end of which is connected to the connection point of the first DC power supply and the second DC power supply. The controller, connected to the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch, is used to determine the control signal based on the input level at the input terminal and the required level at the output terminal. The controller is used for: When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, and the required level of the other end of the first anti-straight-through inductor is positive, the level signal controlling the first controllable switch to the sixth controllable switch is: 011111, 001111, or 101111. When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, and the required level of the other end of the first anti-straight-through inductor is 0 level, the level signal controlling the first controllable switch to the sixth controllable switch is: 011111, 001111, or 101111.

2. The topology circuit according to claim 1, characterized in that, The controller is used for: When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor; When the required level is positive, a level signal indicating closure is sent to the first controllable switch, a level signal indicating opening or closure is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch. When the required level is positive, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is closed is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

3. The topology circuit according to claim 1, characterized in that, The controller is used for: When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor; When the required level is 0, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is closed is sent to the third controllable switch, a level signal indicating that the switch is open or closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch. When the required level is 0, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

4. The topology circuit according to claim 1, characterized in that, The controller is used for: When the input terminal is one end of the first controllable switch, the third controllable switch, and the fifth controllable switch, determine the required level of the other end of the first anti-straight-through inductor; When the required level is negative, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is closed is sent to the fifth controllable switch, and a level signal indicating that the switch is open or closed is sent to the sixth controllable switch. When the required level is negative, a level signal indicating that the switch is open is sent to the first controllable switch, the second controllable switch, the third controllable switch, the fourth controllable switch, the fifth controllable switch, and the sixth controllable switch.

5. The topology circuit according to claim 1, characterized in that, The controller is used for: When the input terminal is the other end of the first anti-straight-through inductor, determine the instantaneous value of the AC voltage at the other end of the first anti-straight-through inductor; Determine whether the instantaneous value of the AC voltage is greater than a preset first voltage threshold; If it is determined that the instantaneous value of the AC voltage is greater than the first voltage threshold, a level signal indicating closure is sent to the first controllable switch, a level signal indicating opening is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch. When the instantaneous value of the AC voltage is determined to be equal to the first voltage threshold, a level signal indicating closure is sent to the first controllable switch, a level signal indicating closure is sent to the second controllable switch, a level signal indicating opening is sent to the third controllable switch, a level signal indicating opening is sent to the fourth controllable switch, a level signal indicating opening is sent to the fifth controllable switch, and a level signal indicating opening is sent to the sixth controllable switch.

6. The topology circuit according to claim 5, characterized in that, The controller is also used for: If it is determined that the instantaneous value of the AC voltage is less than the first voltage threshold, then it is determined whether the instantaneous value of the AC voltage is greater than a preset second voltage threshold; If the instantaneous value of the AC voltage is determined to be less than the first voltage threshold and greater than the second voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is closed is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch. When the instantaneous value of the AC voltage is determined to be equal to the second voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is closed is sent to the third controllable switch, a level signal indicating that the switch is closed is sent to the fourth controllable switch, a level signal indicating that the switch is open is sent to the fifth controllable switch, and a level signal indicating that the switch is open is sent to the sixth controllable switch.

7. The topology circuit according to claim 6, characterized in that, The controller is used for: If it is determined that the instantaneous value of the AC voltage is less than the second voltage threshold, then it is determined whether the instantaneous value of the AC voltage is greater than a preset third voltage threshold. If the instantaneous value of the AC voltage is determined to be less than the second voltage threshold and greater than the third voltage threshold, an open signal is sent to the first controllable switch, an open signal is sent to the second controllable switch, an open signal is sent to the third controllable switch, an open signal is sent to the fourth controllable switch, an open signal is sent to the fifth controllable switch, and an closed signal is sent to the sixth controllable switch. When the instantaneous value of the AC voltage is determined to be equal to the third voltage threshold, a level signal indicating that the switch is open is sent to the first controllable switch, a level signal indicating that the switch is open is sent to the second controllable switch, a level signal indicating that the switch is open is sent to the third controllable switch, a level signal indicating that the switch is open is sent to the fourth controllable switch, a level signal indicating that the switch is closed is sent to the fifth controllable switch, and a level signal indicating that the switch is closed is sent to the sixth controllable switch. If the instantaneous value of the AC voltage is determined to be less than the third voltage threshold, an indicator signal to open is sent to the first controllable switch, an indicator signal to open is sent to the second controllable switch, an indicator signal to open is sent to the third controllable switch, an indicator signal to open is sent to the fourth controllable switch, an indicator signal to close is sent to the fifth controllable switch, and an indicator signal to open is sent to the sixth controllable switch.

8. The topology circuit according to claim 1, characterized in that, The controller is used for: The bridge arm output voltage is determined according to formula (1). ，（1） in, The output voltage of the bridge arm. To control the switching signal of the first controllable switch. To control the switching signal of the second controllable switch, To control the switching signal of the third controllable switch, To control the switching signal of the fourth controllable switch, To control the switching signal of the fifth controllable switch, To control the switching signal of the sixth controllable switch, It is a positive voltage. The voltage is 0. It is a negative voltage. For the AND operator.

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