Interleaved parallel coupling inductor boost converter, control method, controller and medium

Abstract

The invention relates to the technical field of switching power supplies, in particular to an interleaved parallel coupling inductor boost converter, a control method, a controller and a medium, and aims to solve the technical problem of how to realize a converter which better meets the requirements of a space power supply system and has stable and reliable performance. In order to achieve the purpose, the converter comprises an interleaved parallel branch and a filter inductor. The interleaved parallel branch comprises a plurality of boost bridge arms which are connected in parallel and a plurality of energy storage inductors, each boost bridge arm comprises two power electronic devices which are connected in series, and a bridge arm midpoint of each boost bridge arm is connected with a second end of one energy storage inductor; the first ends of the plurality of energy storage inductors are connected with each other and then are connected with the first end of the voltage input end. According to the converter, the interleaving parallel technology is introduced, the energy storage inductor and the filter inductor are coupled, input and output current ripples of the converter can be effectively reduced, the current stress of a power electronic device is reduced, the switching loss of the power electronic device is reduced, and the transient characteristic of the converter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of switching power supplies, and in particular to an interleaved parallel coupled inductor boost converter, a control method, a controller, and a medium. Background Art

[0002] In today's society, environmental and energy issues have become a global concern. Against the backdrop of my country's dual carbon goals and the rapid development of various new and renewable energy sources, research on space solar power stations is of great significance. my country plans to build a MW-class space test station by 2030 and a GW-class commercial space power station by 2050. Research on high-voltage, high-power DC-DC converters in space is one of the core technologies that constrain the development of space power stations. Advances in these technologies will drive leapfrog developments in space technology.

[0003] Space power systems are developing towards high stability, high voltage, high power, and lightweight design. The harsh extreme environments encountered during space power system operation, such as extreme cold and heat, weightlessness and overweight, and electromagnetic radiation, make space high-voltage, high-power DC conversion systems significantly different from terrestrial high-power conversion designs. Many radiation-sensitive devices must be avoided or effectively protected, and many high-performance terrestrial topologies are not suitable for space systems. Currently, research on key technologies for high-voltage, high-power DC conversion in the hundreds of volts and hundreds of kilowatts for space use is still in the theoretical analysis stage. In particular, research on the early topology structure technology of kV / MW-level high-voltage, high-power DC converters requires extensive basic theoretical research. Therefore, the field needs a new DC converter that meets the requirements of space power systems and has stable and reliable performance.

[0004] Accordingly, the art needs a new staggered parallel coupled inductor boost converter solution to solve the above problems. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the present application is proposed to solve or at least partially solve the technical problem of how to realize a converter that better meets the requirements of a space power system and has stable and reliable performance.

[0006] In a first aspect, there is provided an interleaved parallel coupled inductor boost converter comprising: interleaved parallel branches and a filter inductor;

[0007] The staggered parallel branch includes a plurality of parallel boost bridge arms and a plurality of energy storage inductors; the number of the energy storage inductors is the same as the number of the boost bridge arms; the inductance values of the plurality of energy storage inductors are the same;

[0008] Each of the boost bridge arms includes two power electronic devices connected in series;

[0009] The midpoint of each of the boost bridge arms is connected to the second end of an energy storage inductor;

[0010] The first ends of the plurality of energy storage inductors are connected to each other and then to the first end of the voltage input end;

[0011] The first end of the staggered parallel branch is connected to the first end of the filter inductor;

[0012] The second ends of the staggered parallel branches are respectively connected to the second end of the voltage input end and the second end of the voltage output end;

[0013] The second end of the filter inductor is connected to the first end of the voltage output end.

[0014] In one technical solution of the above-mentioned staggered parallel coupled inductor boost converter, there are multiple filter inductors; the number of the filter inductors is the same as the number of the energy storage inductors;

[0015] The first end of each boost bridge arm is respectively connected to the first end of one of the filter inductors;

[0016] The second ends of the plurality of filter inductors are connected to each other and then to the first end of the voltage output end.

[0017] In one technical solution of the above-mentioned staggered parallel coupled inductor boost converter, the converter further includes a filter capacitor;

[0018] The first end of the filter capacitor is connected to the second end of the filter inductor;

[0019] The second end of the filter capacitor is connected to the second end of the voltage output end.

[0020] In one technical solution of the above-mentioned interleaved parallel coupled inductor boost converter, the converter further includes a first capacitor;

[0021] The first end of the first capacitor is connected to the first end of the filter inductor;

[0022] The second end of the first capacitor is connected to the second end of the voltage output end.

[0023] In a technical solution of the above-mentioned staggered parallel coupled inductor boost converter, the coupling coefficients between each energy storage inductor and the filter inductor are equal.

[0024] In a technical solution of the above-mentioned staggered parallel coupled inductor boost converter, there are two boost bridge arms and two energy storage inductors.

[0025] In one technical solution of the above-mentioned staggered parallel coupled inductor boost converter, the two energy storage inductors and the filter inductor are integrated on one EI magnetic core;

[0026] The two energy storage inductors are wound on the two edge magnetic columns of the EI magnetic core; and the filter inductor is wound on the middle magnetic column of the EI magnetic core.

[0027] In a second aspect, a control method for an interleaved parallel coupled inductor boost converter is provided, wherein the converter is any one of the above-mentioned interleaved parallel coupled inductor boost converter technical solutions;

[0028] The method comprises:

[0029] Acquiring an output voltage signal from a voltage output terminal of the converter;

[0030] Acquiring a current signal of each energy storage inductor of the converter;

[0031] obtaining a control signal of the power electronic device according to the output voltage signal and the current signal;

[0032] The power electronic device is controlled to switch according to the control signal.

[0033] In a third aspect, a controller is provided, comprising at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores a computer program, and when the computer program is executed by the at least one processor, the method described in any one of the technical solutions of the control method of the above-mentioned staggered parallel coupled inductor boost converter is implemented.

[0034] In a fourth aspect, a computer-readable storage medium is provided, wherein a plurality of program codes are stored in the computer-readable storage medium, wherein the program codes are suitable for being loaded and run by a processor to execute the method described in any one of the technical solutions of the control method of the above-mentioned staggered parallel coupled inductor boost converter.

[0035] The above one or more technical solutions of this application have at least one or more of the following beneficial effects:

[0036] In the implementation of the staggered parallel coupled inductor boost converter technical solution provided by the present application, the converter of the present application includes staggered parallel branches and filter inductors. The staggered parallel branches include multiple parallel boost bridge arms and multiple energy storage inductors, each boost bridge arm includes two power electronic devices connected in series, and the midpoint of each boost bridge arm is respectively connected to the second end of an energy storage inductor; after the first ends of the multiple energy storage inductors are connected to each other, they are connected to the first end of the voltage input end. The converter of the present application introduces staggered parallel technology to couple the energy storage inductor with the filter inductor, which can effectively reduce the input and output current ripple of the converter, reduce the current stress of the power electronic device, reduce the switching loss of the power electronic device, and improve the transient characteristics of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The disclosure of this application will become more easily understood with reference to the accompanying drawings. Those skilled in the art will readily appreciate that these drawings are for illustrative purposes only and are not intended to limit the scope of protection of this application. Among them:

[0038] Figure 1 1 is a schematic diagram of the main components of an interleaved parallel coupled inductor boost converter according to an embodiment of the present application;

[0039] Figure 2 1 is a schematic diagram of the main components of an interleaved parallel coupled inductor boost converter according to an embodiment of the present application;

[0040] Figure 3 1 is a schematic diagram of the main components of an interleaved parallel coupled inductor boost converter according to another embodiment of the present application;

[0041] Figure 4 1 is a schematic diagram of the main components of an EI magnetic core according to an embodiment of the present application;

[0042] Figure 5 is a schematic diagram of a simplified magnetic circuit model of a coupled inductor according to an implementation of an embodiment of the present application;

[0043] Figure 6 1 is a flow chart of main steps of a control method for an interleaved parallel coupled inductor boost converter according to an embodiment of the present application;

[0044] Figure 7 It is a schematic diagram of the main implementation architecture of a control method for an interleaved parallel coupled inductor boost converter according to an implementation of an embodiment of the present application.

[0045] Reference numerals:

[0046] 11: boost bridge arm; 12: energy storage inductor; 13: filter inductor; 14: filter capacitor; 15: first capacitor. DETAILED DESCRIPTION

[0047] Some embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application.

[0048] In the description of this application, "module" and "processor" may include hardware, software or a combination of the two. A module may include hardware circuits, various suitable sensors, communication ports, and memories, and may also include software components, such as program code, or a combination of software and hardware. The term "A and / or B" represents all possible combinations of A and B, such as just A, just B, or A and B. The term "at least one A or B" or "at least one of A and B" has a similar meaning to "A and / or B" and may include just A, just B, or A and B. The singular terms "a" and "the" may also include plural forms.

[0049] Here we first explain some terms involved in this application.

[0050] Power electronic devices, also known as power semiconductor devices, are high-power electronic devices used primarily in power conversion and control circuits in power equipment. They can be either controllable or uncontrollable.

[0051] Controllable power electronic devices can be fully controlled power semiconductor devices, such as Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), Insulated Gate Bipolar Transistor (IGBT), or Integrated Gate Commutated Thyristors (IGCT). Furthermore, these fully controlled power semiconductor devices are all three-terminal devices, such as MOSFETs, which include a source, drain, and gate; IGBTs, which include a collector, emitter, and gate; and IGCTs, which include a collector, emitter, and gate.

[0052] See attached Figure 1 , Figure 1 FIG is a schematic diagram of the main components of the staggered parallel coupled inductor boost converter according to an embodiment of the present application. Figure 1As shown, the converter of the embodiment of the present application mainly includes an interleaved parallel branch and a filter inductor 13. The interleaved parallel branch includes multiple parallel boost bridge arms 11 and multiple energy storage inductors 12; the number of energy storage inductors 12 is the same as the number of boost bridge arms 11; the inductance value of the multiple energy storage inductors 12 is the same; each boost bridge arm 11 includes two power electronic devices connected in series; the midpoint of each boost bridge arm 11 is respectively connected to the second end of an energy storage inductor 12; the first ends of the multiple energy storage inductors 12 are connected to the first end of the voltage input terminal after being interconnected; the first end of the interleaved parallel branch is connected to the first end of the filter inductor 13; the second end of the interleaved parallel branch is respectively connected to the second end of the voltage input terminal and the second end of the voltage output terminal; the second end of the filter inductor 13 is connected to the first end of the voltage output terminal.

[0053] In this embodiment, the converter introduces staggered parallel technology to couple the energy storage inductor 12 with the filter inductor 13, which can effectively reduce the input and output current ripple of the converter, reduce the current stress of the power electronic devices, reduce the switching loss of the power electronic devices, and improve the transient characteristics of the converter.

[0054] In one embodiment, there can be multiple filter inductors 13; the number of filter inductors 13 is the same as the number of energy storage inductors 12; the first end of each boost bridge arm 11 is connected to the first end of a filter inductor 13; the second ends of multiple filter inductors 13 are connected to each other and then connected to the first end of the voltage output end.

[0055] In a specific example, Figure 1 As shown, there are two boost bridge arms 11, two filter inductors 13, and two energy storage inductors 12. L1 and L2 are energy storage inductors 12; L3 and L4 are filter inductors 13; and C0 is filter capacitor 14. Q1 and Q2 form one boost bridge arm 11, while Q3 and Q4 form another boost bridge arm 11. L1 = L2, L3 = L4, and L1 and L3, L2 and L4 are coupled separately. Q1 and Q3 conduct in a 180° staggered pattern, effectively reducing the converter's input and output current ripple, reducing the filter inductor 13 and filter capacitor 14, improving the converter's power level, and reducing the current stress of power electronic components.

[0056] In another specific example, Figure 2 As shown, there are two boost bridge arms 11 and two energy storage inductors 12, and one filter inductor 13. L1=L2, the duty cycle D of the power electronic devices is equal, and Q1 and Q3 are turned on alternately 180 degrees. The energy storage inductors L1 and L2 are coupled with the filter inductor L3, and the coupling coefficients between L1 and L3 and between L2 and L3 are equal. Figure 2The shown converter can effectively reduce the input and output ripples of the converter, reduce the filter inductor 13 and filter capacitor 14, lower the current stress of power electronic devices, reduce the switching losses of power electronic devices, and achieve efficient power conversion. On this basis, the energy storage inductors 12 corresponding to the two boost arms 11 are respectively coupled with the filter inductor 13, which can retain the advantages of interleaved parallel connection while transferring the right half-plane zero point to the left half-plane, greatly improving the stability of the converter.

[0057] Figure 2 The working states of the converter in [reference] are shown in Table 1. The converter has four working states, namely: State 1: Q1 and Q3 are conducting, Q2 and Q4 are off; State 2: Q1 and Q4 are conducting, Q2 and Q3 are off; State 3: Q2 and Q3 are conducting, Q1 and Q4 are off; State 4: Q2 and Q4 are conducting, Q1 and Q3 are off. It can be divided into two cases: when D < 0.5, it includes working states two, three, and four; when D > 0.5, it includes working states one, two, and three.

[0058] Table 1 Working state diagram of the two-phase interleaved parallel coupled inductor boost converter

[0059] In the third example, as Figure 3 shown, there are three boost arms 11 and three energy storage inductors 12, and one filter inductor 13. Among them, the energy storage inductors 12L1 = L2 = L3, the duty cycles D of the power electronic devices are equal, Q1, Q3, and Q5 conduct with a 120° stagger, and the energy storage inductors L1, L2, and L3 are coupled with the filter inductor L4, and the coupling coefficients between L1 and L4, L2 and L4, and L3 and L4 are equal.

[0060] Figure 3 The working states of the converter in [reference] are shown in Table 2. The converter has eight working states, namely: State 1: Q1, Q3, and Q5 are conducting, Q2, Q4, and Q6 are off; State 2: Q1, Q3, and Q6 are conducting, Q2, Q4, and Q5 are off; State 3: Q1, Q4, and Q5 are conducting, Q2, Q3, and Q6 are off; State 4: Q1, Q4, and Q6 are conducting, Q2, Q3, and Q5 are off; State 5: Q2, Q3, and Q5 are conducting, Q1, Q4, and Q6 are off; State 6: Q2, Q3, and Q6 are conducting, Q1, Q4, and Q5 are off; State 7: Q2, Q4, and Q5 are conducting, Q1, Q3, and Q6 are off; State 8: Q2, Q4, and Q6 are conducting, Q1, Q3, and Q5 are off. It can be divided into three cases: when 0 < D < 1 / 3, it includes working states four, six, seven, and eight; when 1 / 3 < D < 2 / 3, it includes working states two, three, four, five, six, and seven; when 2 / 3 < D < 1, it includes working states one, two, three, and five.

[0061] Table 2 Working state diagram of three-phase interleaved parallel coupled inductor boost converter

[0062] In one embodiment, the converter may further include a filter capacitor 14 , wherein a first end of the filter capacitor 14 is connected to a second end of the filter inductor 13 , and a second end of the filter capacitor 14 is connected to a second end of the voltage output terminal.

[0063] in, Figure 1 、 Figure 2 、 Figure 3 C0 in FIG is a filter capacitor 14 .

[0064] In one embodiment, the converter may further include a first capacitor 15 , wherein a first end of the first capacitor 15 is connected to a first end of the filter inductor 13 , and a second end of the first capacitor 15 is connected to a second end of the voltage output terminal.

[0065] in, Figure 1 C1 and C2 in are first capacitors 15. Figure 1 In the embodiment, the first capacitor 15 is also connected in series with the resistors, that is, C1 is connected in series with Rd1, and C2 is connected in series with Rd2.

[0066] Figure 2 and Figure 3 C1 in is the first capacitor 15 .

[0067] In one embodiment, see the attached Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the main components of an EI core according to an embodiment of the present application. Figure 4 As shown, for a converter with two boost bridge arms 11 and two energy storage inductors 12, the two energy storage inductors 12 and the filter inductor 13 are integrated on one EI core; the two energy storage inductors 12 are wound around the two edge magnetic columns of the EI core (ie, Figure 4 Φ1 and Φ2); filter inductor 13 is wound around the middle magnetic column of the EI core (ie, Figure 4 The EI core forms a symmetrical structure and meets the requirement of L1 = L2. The coupling coefficient between L1 and L2 is k1, and the coupling coefficient between L1 and L3 and between L2 and L3 is k2.

[0068] The simplified magnetic circuit model between the energy storage inductor 12 and the filter inductor 13 is as follows: Figure 5 As shown, the self-inductance and mutual inductance calculation formulas between the filter inductor 13 and the energy storage inductor 12 can be obtained as shown in the following formulas (1)-(4):

[0069]

[0070]

[0071]

[0072]

[0073] Among them, N1 is the number of turns of L1 and L2, N3 is the number of turns of L3, M 13 is the mutual inductance between L1 and L3, M 12 is the mutual inductance between L1 and L2, R1 is the series resistance of L1, R2 is the series resistance of L2, and R3 is the series resistance of L3.

[0074] The relationship between the coupling coefficient k1 and the coupling coefficient k2 can be obtained as shown in formula (5):

[0075] 2k2 2 +k1=1 (5)

[0076] Furthermore, the present application also provides a control method for an interleaved parallel coupled inductor boost converter.

[0077] See attached Figure 6 , Figure 6 FIG. 1 is a flow chart showing the main steps of a control method for an interleaved parallel coupled inductor boost converter according to an embodiment of the present application. Figure 6 As shown, the interleaved parallel coupled inductor boost converter in the embodiment of the present application is the converter described in the above interleaved parallel coupled inductor boost converter embodiment. The control method of the interleaved parallel coupled inductor boost converter in the embodiment of the present application mainly includes the following steps S101 to S104.

[0078] Step S101: obtaining an output voltage signal from a voltage output terminal of a converter.

[0079] Step S102: obtaining a current signal of each energy storage inductor of the converter.

[0080] Step S103: obtaining a control signal of the power electronic device according to the output voltage signal and the current signal.

[0081] Step S104: performing switching control on the power electronic device according to the control signal.

[0082] In this embodiment, please refer to the attached Figure 7 , Figure 7 FIG. 1 is a schematic diagram of the main implementation architecture of a control method for an interleaved parallel coupled inductor boost converter according to an embodiment of the present application. Figure 7As shown, for a converter with two boost bridge arms and two energy storage inductors, the output voltage signal v0(s) of the voltage output terminal of the converter can be obtained, and the current signal i of each energy storage inductor of the converter can be obtained. L1 (s), i L2 (s). Calculate v0(s) and v*0(s) to get W v (s); according to W v (s)Get i* L (s). L1 (s), i L2 (s) respectively with i* L The calculated signal (s) is compared with triangle wave 1 and triangle wave 2, respectively. Based on the comparison results, a control signal for each power electronic device is obtained. The control signal can be a PWM (Pulse Width Modulation) signal. PWM1, PWM2, PWM3, and PWM4 are the control signals for Q1, Q2, Q3, and Q4, respectively.

[0083] It should be pointed out that although the various steps in the above embodiments are described in a specific order, those skilled in the art will understand that in order to achieve the effect of the present application, different steps do not have to be performed in such an order. They can be performed simultaneously (in parallel) or in other orders. These adjusted solutions are equivalent to the technical solutions described in this application, and therefore will also fall within the scope of protection of this application.

[0084] Those skilled in the art will appreciate that all or part of the process of implementing the method of the above embodiment of the present application can also be completed by instructing related hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, the steps of each of the above method embodiments can be implemented. The computer program includes computer program code, which can be in source code form, object code form, executable file, or some intermediate form.

[0085] Another aspect of the present application provides a computer-readable storage medium.

[0086] In an embodiment of a computer-readable storage medium according to the present application, the computer-readable storage medium can be configured to store a program for executing the control method for the interleaved parallel coupled inductor boost converter of the above-described method embodiment. The program can be loaded and executed by a processor to implement the control method for the interleaved parallel coupled inductor boost converter. Optionally, the computer-readable storage medium in this embodiment of the present application is a non-transitory computer-readable storage medium.

[0087] Another aspect of the present application also provides a controller.

[0088] In an embodiment of a controller according to the present application, the controller may include at least one processor; and a memory communicatively connected to the at least one processor; wherein a computer program is stored in the memory, and when the computer program is executed by the at least one processor, the method described in any of the above embodiments is implemented.

[0089] In some embodiments of the present application, the controller described in the present application may be a single-chip microcomputer, a DSP (Digital Signal Processing) chip, an FPGA (Field Programmable Gate Array) chip, etc., and the embodiments of the present application are not limited to this.

[0090] Thus far, the technical solution of the present application has been described in conjunction with an embodiment shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.

Claims

1. A staggered parallel coupled inductor boost converter, characterized in that: include: Interleaved parallel branches and filter inductors; The staggered parallel branch includes a plurality of parallel boost bridge arms and a plurality of energy storage inductors; the number of the energy storage inductors is the same as the number of the boost bridge arms; the inductance values of the plurality of energy storage inductors are the same; Each of the boost bridge arms includes two power electronic devices connected in series; The midpoint of each of the boost bridge arms is connected to the second end of an energy storage inductor; The first ends of the plurality of energy storage inductors are connected to each other and then to the first end of the voltage input end; The first end of the staggered parallel branch is connected to the first end of the filter inductor; The second ends of the staggered parallel branches are respectively connected to the second end of the voltage input end and the second end of the voltage output end; The second end of the filter inductor is connected to the first end of the voltage output end.

2. The interleaved parallel coupled inductor boost converter according to claim 1, characterized in that: There are multiple filter inductors; the number of the filter inductors is the same as the number of the energy storage inductors; The first end of each boost bridge arm is respectively connected to the first end of one of the filter inductors; The second ends of the plurality of filter inductors are connected to each other and then to the first end of the voltage output end.

3. The interleaved parallel coupled inductor boost converter according to claim 1 or 2, characterized in that: The converter further includes a filter capacitor; The first end of the filter capacitor is connected to the second end of the filter inductor; The second end of the filter capacitor is connected to the second end of the voltage output end.

4. The interleaved parallel coupled inductor boost converter according to claim 3, characterized in that: The converter further includes a first capacitor; The first end of the first capacitor is connected to the first end of the filter inductor; The second end of the first capacitor is connected to the second end of the voltage output end.

5. The interleaved parallel coupled inductor boost converter according to claim 1, characterized in that: The coupling coefficients between each energy storage inductor and the filter inductor are equal.

6. The interleaved parallel coupled inductor boost converter according to claim 5, characterized in that: There are two boost bridge arms and two energy storage inductors.

7. The interleaved parallel coupled inductor boost converter according to claim 6, characterized in that: The two energy storage inductors and the filter inductor are integrated on an EI magnetic core; The two energy storage inductors are wound on the two edge magnetic columns of the EI magnetic core; and the filter inductor is wound on the middle magnetic column of the EI magnetic core.

8. A control method for an interleaved parallel coupled inductor boost converter, characterized in that: The converter is a converter according to any one of claims 1 to 7; The method comprises: Acquiring an output voltage signal from a voltage output terminal of the converter; Acquiring a current signal of each energy storage inductor of the converter; obtaining a control signal of the power electronic device according to the output voltage signal and the current signal; The power electronic device is controlled to switch according to the control signal.

9. A controller, characterized in that: include: at least one processor; and, a memory communicatively coupled to the at least one processor; The memory stores a computer program, and when the computer program is executed by the at least one processor, the control method of the interleaved parallel coupled inductor boost converter according to claim 8 is implemented.

10. A computer-readable storage medium storing a plurality of program codes, characterized in that: The program code is suitable for being loaded and run by a processor to execute the control method of the interleaved parallel coupled inductor boost converter according to claim 8.

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