A high-gain and high-power quality converter

Abstract

This application discloses a high-gain, high-power-quality converter, comprising: an input DC power supply, a switching transistor, a coupled inductor, several diodes and capacitors, and a DC load; a PI control circuit is also provided. By combining a voltage multiplier unit, a switching capacitor, and a coupled inductor with a traditional boost converter, the converter can flexibly adjust the converter's duty cycle and the turns ratio of the coupled inductor according to different operating conditions, changing the voltage gain and achieving a high-voltage output. This provides the circuit with high flexibility and effectively avoids problems such as low conversion efficiency caused by the converter operating under extreme duty cycle conditions. Furthermore, when the input voltage or load changes, the converter's duty cycle is controlled and adjusted in real time to stabilize the output voltage, effectively improving the power quality of the output voltage.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a high-gain and high-power quality converter. Background Art

[0002] To reduce environmental pollution and address global energy shortages, new energy sources such as solar, wind, and wave power are rapidly developing. Furthermore, grid-connected renewable energy sources are attracting widespread attention in the power industry. Typically, renewable energy generators have low voltage levels and large output voltage fluctuations, which severely impact the power quality of power systems and hinder their direct integration into the grid. As a key component of renewable energy grid-connected technology, DC converters can increase the voltage level of renewable energy generators and, to a certain extent, improve power quality. Therefore, research and design of converters with high gain and high power quality are highly valuable.

[0003] Traditional boost converters can theoretically achieve high output voltages by adjusting the duty cycle. However, at extremely high duty cycles, the voltage stress of the power switch is approximately equal to the output voltage. Therefore, the switch must withstand extremely high voltages, potentially leading to device breakdown. Furthermore, at extremely high duty cycles, diode reverse recovery is severe, resulting in high converter losses and low efficiency. Furthermore, due to circuit parasitics, the voltage gain of traditional boost converters is still limited. Therefore, traditional boost converters are not suitable for high-voltage applications. Furthermore, when the input voltage or load changes, the converter's output voltage can fluctuate significantly, severely impacting the output power quality. Summary of the Invention

[0004] The present application provides a high-gain, high-power quality converter that can change the voltage gain to achieve high voltage output, making the circuit highly flexible. At the same time, when the input voltage or load changes, the duty cycle of the converter is controlled and adjusted in real time to stabilize the output voltage, thereby effectively improving the power quality of the output voltage.

[0005] In view of this, the present application provides a high-gain high power quality converter, comprising: an input DC power supply V in , switch tube S, coupled inductor, several diodes and capacitors, DC load R;

[0006] in:

[0007] Input DC power supply V in The positive electrode and the coupling inductor leakage inductance L k The first end of the connection;

[0008] Coupled inductor leakage inductance L kThe second end of the coupled inductor primary winding T1 and the first end of the coupled inductor excitation inductor L m The first end of the connection;

[0009] The second end of the coupled inductor primary winding T1 is connected to the coupled inductor excitation inductor L m The second end of the capacitor C1, the second end of the capacitor C2, the anode of the diode D1, and the first end of the switch tube S are connected;

[0010] A first end of the capacitor C1 is connected to the cathode of the diode D2 and the anode of the diode D3;

[0011] The first end of the capacitor C2 is connected to the cathode of the diode D4, the anode of the diode D5, and the second end of the capacitor C5;

[0012] The cathode of the diode D1 is connected to the anode of the diode D2, the second end of the capacitor C3, and the first end of the capacitor C4;

[0013] The cathode of the diode D3 is connected to the first end of the capacitor C3 and the anode of the diode D4;

[0014] The cathode of the diode D5 is connected to the second end of the coupled inductor secondary winding T2 and the second end of the capacitor C6;

[0015] A first end of the capacitor C5 is connected to the anode of the diode D6 and the first end of the coupled inductor secondary winding T2;

[0016] A first end of the capacitor C6 is connected to the cathode of the diode D6 and the anode of the diode D7;

[0017] The cathode of the diode D7 is connected to the first end of the capacitor C7 and the first end of the DC load R;

[0018] Input DC power supply V in The negative electrode is connected to the second end of the switch tube S, the second end of the capacitor C4, the second end of the capacitor C7, and the second end of the DC load R.

[0019] Optionally, it further includes: a control circuit;

[0020] The control circuit adopts PI control to sample the output voltage of the high-gain high power quality converter and adjust the duty cycle of the switch tube S, wherein the output voltage is the voltage of the DC load R.

[0021] Optionally, when the high-gain high power quality converter operates in continuous conduction mode, it includes: a first working mode in the time period t0-t1, a second working mode in the time period t1-t2, a third working mode in the time period t2-t3, and a fourth working mode in the time period t3-t4.

[0022] Optionally, the first working mode specifically includes:

[0023] Switch tube S, diode D2, diode D4, diode D5, and diode D6 are forward conducting, and diode D1, diode D3, and diode D7 are reverse blocking; input DC power supply V in The magnetizing inductance L of the coupled inductor m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lk and leakage inductance current i Lk Increase; capacitor C4 provides energy to capacitor C1 through diode D2; capacitor C3 and capacitor C4 provide energy to capacitor C2 through diode D4 and switch tube S; capacitor C5 and capacitor C6 are charged; capacitor C7 provides energy to DC load R.

[0024] Optionally, the second working mode specifically includes:

[0025] Switch tube S, diode D5, and diode D6 are forward conducting, and diode D1, diode D2, diode D3, diode D4, and diode D7 are reverse blocked; input DC power supply V in Continue to the coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lm and leakage inductance current i Lk Increase, and reach the maximum current before the end of this second working mode; capacitor C1 and capacitor C2 are in a fully charged state, and their voltages are respectively; V C4 =V C4 、V C2 =V C3 + V C4 ; Capacitor C5 and capacitor C6 continue to charge; capacitor C7 provides energy to the DC load R; when the switch tube S is in the off state, the second working mode ends.

[0026] Optionally, the third working mode specifically includes:

[0027] Switch tube S, diode D2, diode D4, diode D5, and diode D6 are in the off state, diode D1, diode D3, and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy to capacitor C4 through diode D1; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L kand capacitor C1 provide energy to capacitor C3 through diode D3; the magnetizing inductor current i Lm and leakage inductance current i Lk Reduce; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

[0028] Optionally, the fourth working mode specifically includes:

[0029] Switch tube S, diode D2, diode D3, diode D4, diode D5, and diode D6 are in the off state, diode D1 and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Energy continues to be supplied to capacitor C4 through diode D1; capacitors C1 and C3 are fully charged; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

[0030] Optionally, when the high-gain high power quality converter operates in a stable state, the voltage stress of each capacitor is calculated by volt-second balance, wherein the turns ratio of the secondary winding T2 of the coupled inductor to the primary winding T1 is n.

[0031] Optionally, the voltage stress of each capacitor is expressed as:

[0032] ;

[0033] Where n is the turns ratio of the secondary winding T2 to the primary winding T1 of the coupled inductor.

[0034] Optionally, the high-gain high power quality converter

[0035] The voltage gain M is expressed as:

[0036] ;

[0037] Where M is the voltage gain.

[0038] It can be seen from the above technical solutions that this application has the following advantages:

[0039] This application provides a high-gain, high-power quality converter that combines a voltage multiplier, a switched capacitor, and a coupled inductor with a traditional boost converter. The converter's duty cycle and the coupled inductor's turns ratio can be flexibly adjusted according to operating conditions, varying the voltage gain and achieving high-voltage output. This provides circuit flexibility and effectively avoids problems such as low conversion efficiency caused by operating the converter under extreme duty cycle conditions. Furthermore, when the input voltage or load changes, the converter's duty cycle is controlled and adjusted in real time to stabilize the output voltage, effectively improving the power quality of the output voltage.

[0040] Compared with existing technologies:

[0041] 1. High voltage gain: The duty cycle of the converter and the turns ratio of the coupled inductor can be flexibly adjusted according to different working conditions to improve the voltage gain and achieve high voltage output.

[0042] 2. High reliability: Under complex working conditions such as input voltage changes and load changes, it can achieve fast response, stabilize output voltage, and improve the power quality of output voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 A high-gain, high-power quality converter provided in an embodiment of the present application;

[0044] Figure 2 This is a working waveform diagram of a high-gain and high-power quality converter provided in an embodiment of the present application;

[0045] Figure 3 This is a first operating mode of a high-gain, high-power quality converter provided in an embodiment of the present application;

[0046] Figure 4 This is a second operating mode of a high-gain, high-power quality converter provided in an embodiment of the present application;

[0047] Figure 5 This is a third operating mode of a high-gain, high-power quality converter provided in an embodiment of the present application;

[0048] Figure 6 This is the fourth operating mode of a high-gain, high-power quality converter provided in an embodiment of the present application. DETAILED DESCRIPTION

[0049] In order to help those skilled in the art better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0050] See also Figure 1 , a high-gain, high-power-quality converter provided in an embodiment of the present application includes: an input DC power supply Vin, a switch tube S, a coupled inductor, a plurality of diodes and capacitors, and a DC load R;

[0051] in:

[0052] Input DC power supply V in The positive electrode and the coupling inductor leakage inductance L k The first end of the connection;

[0053] Coupled inductor leakage inductance L k The second end of the coupled inductor primary winding T1 and the first end of the coupled inductor excitation inductor L m The first end of the connection;

[0054] The second end of the coupled inductor primary winding T1 is connected to the coupled inductor excitation inductor L m The second end of the capacitor C1, the second end of the capacitor C2, the anode of the diode D1, and the first end of the switch tube S are connected;

[0055] A first end of the capacitor C1 is connected to the cathode of the diode D2 and the anode of the diode D3;

[0056] The first end of the capacitor C2 is connected to the cathode of the diode D4, the anode of the diode D5, and the second end of the capacitor C5;

[0057] The cathode of the diode D1 is connected to the anode of the diode D2, the second end of the capacitor C3, and the first end of the capacitor C4;

[0058] The cathode of the diode D3 is connected to the first end of the capacitor C3 and the anode of the diode D4;

[0059] The cathode of the diode D5 is connected to the second end of the coupled inductor secondary winding T2 and the second end of the capacitor C6;

[0060] A first end of the capacitor C5 is connected to the anode of the diode D6 and the first end of the coupled inductor secondary winding T2;

[0061] A first end of the capacitor C6 is connected to the cathode of the diode D6 and the anode of the diode D7;

[0062] The cathode of the diode D7 is connected to the first end of the capacitor C7 and the first end of the DC load R;

[0063] Input DC power supply V in The negative electrode is connected to the second end of the switch tube S, the second end of the capacitor C4, the second end of the capacitor C7, and the second end of the DC load R.

[0064] It should be noted that the control circuit of the converter of this embodiment adopts PI control, that is, the output voltage is sampled and the duty cycle of the switch is adjusted through PI regulation. Its basic characteristics are Figure 1 shown.

[0065] In one embodiment, when the high-gain high power quality converter operates in the continuous conduction mode, it includes: a first operating mode in the time period t0-t1, a second operating mode in the time period t1-t2, a third operating mode in the time period t2-t3, and a fourth operating mode in the time period t3-t4. Figure 2 shown.

[0066] in:

[0067] The first working mode, such as Figure 3 As shown, specifically including:

[0068] Switch tube S, diode D2, diode D4, diode D5, and diode D6 are forward conducting, and diode D1, diode D3, and diode D7 are reverse blocking; input DC power supply V in The magnetizing inductance L of the coupled inductor m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lk and leakage inductance current i Lk Increase; capacitor C4 provides energy to capacitor C1 through diode D2; capacitor C3 and capacitor C4 provide energy to capacitor C2 through diode D4 and switch tube S; capacitor C5 and capacitor C6 are charged; capacitor C7 provides energy to DC load R.

[0069] The second working mode, such as Figure 4 As shown, specifically including:

[0070] Switch tube S, diode D5, and diode D6 are forward conducting, and diode D1, diode D2, diode D3, diode D4, and diode D7 are reverse blocked; input DC power supply V in Continue to the coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lm and leakage inductance current i LkIncrease, and reach the maximum current before the end of this second working mode; capacitor C1 and capacitor C2 are in a fully charged state, and their voltages are respectively; V C4 =V C4 、V C2 =V C3 + V C4 ; Capacitor C5 and capacitor C6 continue to charge; capacitor C7 provides energy to the DC load R; when the switch tube S is in the off state, the second working mode ends.

[0071] The third working mode, such as Figure 5 As shown, specifically including:

[0072] Switch tube S, diode D2, diode D4, diode D5, and diode D6 are in the off state, diode D1, diode D3, and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy to capacitor C4 through diode D1; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k and capacitor C1 provide energy to capacitor C3 through diode D3; the magnetizing inductor current i Lm and leakage inductance current i Lk Reduce; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

[0073] The fourth working mode, such as Figure 6 As shown, specifically including:

[0074] Switch tube S, diode D2, diode D3, diode D4, diode D5, and diode D6 are in the off state, diode D1 and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Energy continues to be supplied to capacitor C4 through diode D1; capacitors C1 and C3 are fully charged; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

[0075] Furthermore, in one embodiment, when the high-gain high power quality converter operates in a stable state, the voltage stress of each capacitor is calculated by volt-second balance, wherein the turns ratio of the secondary winding T2 of the coupled inductor to the primary winding T1 is n.

[0076] The expression for the voltage stress of a capacitor is:

[0077] ;

[0078] Where n is the turns ratio of the secondary winding T2 to the primary winding T1 of the coupled inductor.

[0079] According to the above expression of capacitor voltage stress, the voltage gain M of the high-gain high power quality converter can be obtained as follows:

[0080] ;

[0081] Where M is the voltage gain.

[0082] The high-gain, high-power-quality converter provided in this application consists of a DC input power supply, a switching transistor, a coupled inductor, seven diodes, seven capacitors, and a DC load. The converter's structure can be modified to adjust the duty cycle and turns ratio of the coupled inductor according to different operating conditions, thereby varying the voltage gain and achieving high-voltage output over a wide voltage range. The converter's control circuit utilizes PI control, which adjusts the switching transistor's duty cycle in real time by sampling the output voltage. This allows for rapid response, stable output voltage, and improved power quality under complex operating conditions such as input voltage and load variations.

[0083] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described systems and units can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0084] The terms "first," "second," "third," "fourth," and the like (if any) in the specification of the present application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or apparatus.

[0085] It should be understood that in this application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or plural.

[0086] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0088] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name: Read-Only Memory, English abbreviation: ROM), random access memory (full name: Random Access Memory, English abbreviation: RAM), disk or optical disk, and other media that can store program code.

[0090] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A high-gain, high-power-quality converter, characterized in that: include: Input DC power supply V in , switch tube S, coupled inductor, several diodes and capacitors, DC load R; in: Input DC power supply V in The positive electrode and the coupling inductor leakage inductance L k The first end of the connection; Coupled inductor leakage inductance L k The second end of the coupled inductor primary winding T1 and the first end of the coupled inductor excitation inductor L m The first end of the connection; The second end of the coupled inductor primary winding T1 is connected to the coupled inductor excitation inductor L m The second end of the capacitor C1, the second end of the capacitor C2, the anode of the diode D1, and the first end of the switch tube S are connected; A first end of the capacitor C1 is connected to the cathode of the diode D2 and the anode of the diode D3; The first end of the capacitor C2 is connected to the cathode of the diode D4, the anode of the diode D5, and the second end of the capacitor C5; The cathode of the diode D1 is connected to the anode of the diode D2, the second end of the capacitor C3, and the first end of the capacitor C4; The cathode of the diode D3 is connected to the first end of the capacitor C3 and the anode of the diode D4; The cathode of the diode D5 is connected to the second end of the coupled inductor secondary winding T2 and the second end of the capacitor C6; A first end of the capacitor C5 is connected to the anode of the diode D6 and the first end of the coupled inductor secondary winding T2; A first end of the capacitor C6 is connected to the cathode of the diode D6 and the anode of the diode D7; The cathode of the diode D7 is connected to the first end of the capacitor C7 and the first end of the DC load R; Input DC power supply V in The negative electrode is connected to the second end of the switch tube S, the second end of the capacitor C4, the second end of the capacitor C7, and the second end of the DC load R; When the high-gain high power quality converter operates in the continuous conduction mode, it includes: a first working mode in the time period t0-t1, a second working mode in the time period t1-t2, a third working mode in the time period t2-t3, and a fourth working mode in the time period t3-t4; The first working mode specifically includes: Switch tube S, diode D2, diode D4, diode D5, and diode D6 are forward conducting, and diode D1, diode D3, and diode D7 are reverse blocking; input DC power supply V in The magnetizing inductance L of the coupled inductor m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lk and leakage inductance current i Lk Increase; capacitor C4 provides energy to capacitor C1 through diode D2; capacitor C3 and capacitor C4 provide energy to capacitor C2 through diode D4 and switch tube S; capacitor C5 and capacitor C6 are charged; capacitor C7 provides energy to DC load R.

2. The high-gain, high-power-quality converter according to claim 1, characterized in that: Also includes: control circuit; The control circuit adopts PI control to sample the output voltage of the high-gain high power quality converter and adjust the duty cycle of the switch tube S, wherein the output voltage is the voltage of the DC load R.

3. The high-gain, high-power-quality converter according to claim 1, characterized in that: The second working mode specifically includes: Switch tube S, diode D5, and diode D6 are forward conducting, and diode D1, diode D2, diode D3, diode D4, and diode D7 are reverse blocked; input DC power supply V in Continue to the coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy, excitation inductor current i Lm and leakage inductance current i Lk Increase, and reach the maximum current before the end of this second working mode; capacitor C1 and capacitor C2 are in a fully charged state, and their voltages are respectively; V C4 =V C4 、V C2 =V C3 + V C4 ; Capacitor C5 and capacitor C6 continue to charge; capacitor C7 provides energy to the DC load R; when the switch tube S is in the off state, the second working mode ends.

4. The high-gain, high-power-quality converter according to claim 1, characterized in that: The third working mode specifically includes: Switch tube S, diode D2, diode D4, diode D5, and diode D6 are in the off state, diode D1, diode D3, and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Provide energy to capacitor C4 through diode D1; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k and capacitor C1 provide energy to capacitor C3 through diode D3; the magnetizing inductor current i Lm and leakage inductance current i Lk Reduce; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

5. The high-gain, high-power-quality converter according to claim 1, characterized in that: The fourth working mode specifically includes: Switch tube S, diode D2, diode D3, diode D4, diode D5, and diode D6 are in the off state, diode D1 and diode D7 are forward conducting; input DC power supply V in , coupled inductor excitation inductance L m and coupling inductor leakage inductance L k Energy continues to be supplied to capacitor C4 through diode D1; capacitors C1 and C3 are fully charged; input DC power supply V in , coupled inductor excitation inductance L m , coupled inductor leakage inductance L k , capacitor C2, capacitor C5 and capacitor C6 provide energy to capacitor C7 and DC load R through diode D7.

6. The high-gain and high-power quality converter according to claim 1, characterized in that: When the high-gain high power quality converter operates in a stable state, the voltage stress of each capacitor is calculated by volt-second balance, wherein the turns ratio of the secondary winding T2 of the coupled inductor to the primary winding T1 is n.

7. The high-gain, high-power-quality converter according to claim 6, characterized in that: The expression of the voltage stress of each capacitor is: ； Where n is the turns ratio of the secondary winding T2 to the primary winding T1 of the coupled inductor.

8. The high-gain, high-power-quality converter according to claim 7, characterized in that: The voltage gain M of the high-gain high power quality converter is expressed as: ； Where M is the voltage gain.

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