Isolated Weinberg converter, control method, controller and storage medium

Abstract

The invention relates to the technical field of switching power supplies, in particular to an isolated Weinberg converter, a control method, a controller and a storage medium, and aims to solve the technical problem of how to reduce the size of the converter on the premise of improving the power density of the converter. In order to achieve the purpose, the isolated Weinberg converter comprises a flyback circuit and a plurality of push-pull circuits connected in parallel, and the flyback circuit and the push-pull circuits are connected in series at the direct current input end and connected in parallel at the direct current output end. The number of push-pull circuits of the Weinberg converter can be increased, and staggered parallel connection of the push-pull circuits is achieved. Every one group of push-pull circuit is added, the actual working frequency and the input and output current ripple frequency of the converter can be improved. The more the push-pull circuits of the converter are, the more the contained power electronic devices are, the faster the equivalent working frequency of the converter is, and the power density of the converter can be effectively improved while the size of the converter is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of switching power supplies, and in particular to an isolated Weinberg converter, a control method, a controller, and a storage medium. Background Art

[0002] The isolated Weinberg topology is a common DC / DC converter topology for space power systems. Its structure consists of a series-connected flyback and push-pull circuit input with parallel outputs. Because of the push-pull circuit, the equivalent operating frequency of the flyback and push-pull transformers in the isolated Weinberg topology is twice the operating frequency of the switching transistor. Compared to other traditional isolation topologies, this topology offers the advantages of higher power density and reliability.

[0003] As future space power systems place increasing demands on the power density, power levels, and efficiency of DC / DC converters, the isolated Weinberg topology operating under hard-switching conditions, which increases power density by increasing switching frequency, will result in reduced efficiency and heat dissipation difficulties. Therefore, it is necessary to effectively reduce the size of the transformer while ensuring increased power density, tailored to the actual needs of space power systems.

[0004] Accordingly, the art needs a new isolated Weinberg 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 reduce the volume of the converter while improving the power density of the converter.

[0006] In a first aspect, an isolated Weinberg converter is provided, the converter comprising:

[0007] Flyback circuit and multiple parallel push-pull circuits;

[0008] The flyback circuit and the plurality of push-pull circuits are connected in series at the DC input end and in parallel at the DC output end;

[0009] The primary circuit of each push-pull circuit includes a first power electronic device, a second power electronic device, and a primary winding; the first end of the first power electronic device is connected to the first end of the primary winding; the first end of the second power electronic device is connected to the second end of the primary winding; the second ends of the first power electronic device and the second power electronic device are connected to each other and then to the second end of the DC input terminal;

[0010] The primary first end of the flyback circuit is connected to the first end of the DC input end;

[0011] The second primary end of the flyback circuit is connected to the middle tap of the primary windings of the plurality of push-pull circuits;

[0012] The secondary circuit of each push-pull circuit includes a first secondary diode, a second secondary diode, and a secondary winding; the first end of the secondary winding is connected to the first end of the first secondary diode; the second end of the secondary winding is connected to the first end of the second secondary diode; the second ends of the first secondary diode and the second secondary diode are connected to each other and then to the first end of the DC output end;

[0013] The first end of the secondary side of the flyback circuit is connected to the first end of the DC output end;

[0014] The second end of the secondary side of the flyback circuit is connected to the secondary windings of the plurality of push-pull circuits.

[0015] In one technical solution of the above-mentioned isolated Weinberg converter, the secondary circuit of the push-pull circuit further includes a third secondary diode and a fourth secondary diode;

[0016] The first end of each secondary winding is connected to the second end of the secondary side of the flyback circuit through the third secondary side diode;

[0017] The second end of each secondary winding is connected to the second end of the secondary side of the flyback circuit through the fourth secondary diode;

[0018] The middle taps of the plurality of secondary windings are connected to each other and then to the second end of the DC output end.

[0019] In one technical solution of the above-mentioned isolated Weinberg converter, the secondary circuit of the push-pull circuit further includes a fifth secondary diode;

[0020] The middle taps of the plurality of secondary windings are connected to each other and then to the first end of the fifth secondary diode;

[0021] The second end of the fifth secondary diode is connected to the second end of the secondary side of the flyback circuit.

[0022] In a technical solution of the above-mentioned isolated Weinberg converter, the converter further includes a first clamping power electronic device and a second clamping power electronic device;

[0023] The first end of the first clamping power electronic device is connected to the first end of each primary winding;

[0024] The first end of the second clamping power electronic device is connected to the second end of each primary winding;

[0025] The second ends of the first clamping power electronic device and the second power electronic device are connected to each other and then to the second end of the DC input end.

[0026] In one technical solution of the above-mentioned isolated Weinberg converter, the converter further includes a clamping capacitor;

[0027] a first end of the clamping capacitor and second ends of the first clamping power electronic device and the second clamping power electronic device;

[0028] The second end of the clamping capacitor is connected to the second end of the DC input end.

[0029] In one technical solution of the above-mentioned isolated Weinberg converter, the primary windings and secondary windings of the plurality of push-pull circuits are wound on the edge magnetic poles of the EI magnetic core;

[0030] The primary winding and the secondary winding of the flyback circuit are wound on the middle magnetic column of the EI magnetic core.

[0031] In one technical solution of the above-mentioned isolated Weinberg converter, the converter further includes an input capacitor;

[0032] The input capacitor is connected in parallel with the DC input terminal; and / or,

[0033] The converter further includes an output capacitor;

[0034] The output capacitor is connected in parallel with the DC output terminal.

[0035] In a second aspect, a control method for an isolated Weinberg converter is provided, wherein the isolated Weinberg converter is a converter described in any one of the above-mentioned technical solutions for the isolated Weinberg converter;

[0036] The method comprises:

[0037] Controlling the power electronic devices to be turned on in sequence according to a phase difference of 2π / N to achieve control of the converter;

[0038] Wherein, N is the number of bridge arms formed by power electronic devices in the push-pull circuit connected in parallel in the converter.

[0039] 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 above-mentioned method for controlling the isolated Weinberg converter is implemented.

[0040] In a fourth aspect, a computer-readable storage medium is provided, which stores a plurality of program codes, 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 above-mentioned control method of the isolated Weinberg converter.

[0041] The above one or more technical solutions of this application have at least one or more of the following beneficial effects:

[0042] In implementing the technical solution of the isolated Weinberg converter provided by the present application, the isolated Weinberg converter of the present application includes a flyback circuit and a plurality of push-pull circuits connected in parallel, wherein the flyback circuit and the plurality of push-pull circuits are connected in series at the DC input end and in parallel at the DC output end. It is possible to increase the number of push-pull circuits of the Weinberg converter and realize staggered parallel connection of the push-pull circuits. Each additional set of push-pull circuits can achieve an increase in the actual operating frequency of the converter and the input and output current ripple frequency. The more push-pull circuits the converter of the present application has, the more power electronic devices it contains, and the faster the equivalent operating frequency of the converter. While reducing the volume of the converter, it can effectively improve the power density of the converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] 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:

[0044] Figure 1 1 is a schematic diagram of the main components of an isolated Weinberg converter according to an embodiment of the present application;

[0045] Figure 2 1 is a schematic diagram of the main components of an isolated Weinberg converter according to another embodiment of the present application;

[0046] Figure 3 1 is a schematic diagram of a magnetic integration structure of an isolated Weinberg converter according to an embodiment of the present application;

[0047] Figure 4 1 is a flow chart of main steps of a control method for an isolated Weinberg converter according to an embodiment of the present application.

[0048] Reference numerals:

[0049] 11: Flyback circuit; 12: Push-pull circuit; 121: First power electronic device; 122: Second power electronic device; 123: Primary winding; 124: Secondary winding; 125: First secondary diode; 126: Second secondary diode; 127: Third secondary diode; 128: Fourth secondary diode; 129: Fifth secondary diode; 13: First clamping power electronic device; 14: Second clamping power electronic device; 15: Clamping capacitor; 16: Input capacitor; 17: Output capacitor. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] Here we first explain some terms involved in this application.

[0053] 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.

[0054] 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). Moreover, these fully controlled power semiconductor devices are all three-terminal devices, such as MOSFET, which includes source, drain, and gate; IGBT, which includes collector, emitter, and gate; and IGCT, which includes collector, emitter, and gate.

[0055] See attached Figure 1 , Figure 1 FIG. 1 is a schematic diagram of the main components of an isolated Weinberg converter according to an embodiment of the present application. Figure 1 As shown, the isolated Weinberg converter of the embodiment of the present application mainly includes: a flyback circuit 11 and a plurality of push-pull circuits 12 connected in parallel; the flyback circuit 11 and the plurality of push-pull circuits 12 are connected in series at the DC input end and in parallel at the DC output end; the primary circuit of each push-pull circuit 12 includes a first power electronic device 121, a second power electronic device 122 and a primary winding 123; the first end of the first power electronic device 121 is connected to the first end of the primary winding 123; the first end of the second power electronic device 122 is connected to the second end of the primary winding 123; the second ends of the first power electronic device 121 and the second power electronic device 122 are connected to each other and then connected to the second end of the DC input end; the first end of the primary side of the flyback circuit 11 is connected to the DC output end. The first end of the input end is connected; the second end of the primary side of the flyback circuit 11 is connected to the middle tap of the primary winding 123 of the multiple push-pull circuits 12; the secondary circuit of each push-pull circuit 12 includes a first secondary diode 125, a second secondary diode 126 and a secondary winding 124; the first end of the secondary winding 124 is connected to the first end of the first secondary diode 125; the second end of the secondary winding 124 is connected to the first end of the second secondary diode 126; the second ends of the first secondary diode 125 and the second secondary diode 126 are connected to each other and then connected to the first end of the DC output end; the first end of the secondary side of the flyback circuit 11 is connected to the first end of the DC output end; the second end of the secondary side of the flyback circuit 11 is connected to the secondary winding 124 of the multiple push-pull circuits 12.

[0056] In this embodiment, if Figure 1 As shown, n groups of parallel push-pull circuits 12 can be set, and the flyback circuit 11 and the n groups of parallel push-pull circuits 12 are connected in series at the DC input end and in parallel at the DC output end. It is possible to increase the number of push-pull circuits 12 of the Weinberg converter and realize the staggered parallel connection of the push-pull circuits 12. Each additional group of push-pull circuits 12 can achieve an increase in the actual operating frequency of the converter and the input and output current ripple frequency. The more push-pull circuits 12 the converter of the present application has, the more power electronic devices it contains, and the faster the equivalent operating frequency of the converter. While reducing the volume of the converter, it can effectively improve the power density of the converter.

[0057] in, Figure 1 Q1 in the figure is the first power electronic device 121 , and Q2 is the second power electronic device 122 .

[0058] In one embodiment, the first power electronic device and the second power electronic device may be controllable power electronic devices, such as metal oxide semiconductor field effect transistors (MOSFETs).

[0059] One implementation method, such as Figure 1 As shown, the secondary circuit of the push-pull circuit 12 may further include a third secondary diode 127 and a fourth secondary diode 128; the first end of each secondary winding 124 is connected to the second secondary end of the flyback circuit 11 through the third secondary diode 127; the second end of each secondary winding 124 is connected to the second secondary end of the flyback circuit 11 through the fourth secondary diode 128; and the middle taps of the multiple secondary windings 124 are connected to each other and then to the second end of the DC output end.

[0060] In another embodiment, Figure 2 As shown, the secondary circuit of the push-pull circuit 12 may further include a fifth secondary diode 129; the middle taps of the multiple secondary windings 124 are connected to each other and then to the first end of the fifth secondary diode 129; the second end of the fifth secondary diode 129 is connected to the second end of the secondary side of the flyback circuit 11.

[0061] In one embodiment, Figure 1 As shown, the converter may further include a first clamped power electronic device 13 and a second clamped power electronic device 14; the first end of the first clamped power electronic device 13 is connected to the first end of each primary winding 123; the first end of the second clamped power electronic device 14 is connected to the second end of each primary winding 123; the second ends of the first clamped power electronic device 13 and the second power electronic device 122 are connected to each other and then to the second end of the DC input terminal.

[0062] in, Figure 1 Qclamp1 is the first clamping power electronic device 13 , and Qclamp2 is the second clamping power electronic device 14 .

[0063] In one embodiment, the first clamping power electronic device 13 and the second clamping power electronic device 14 may be metal oxide semiconductor field effect transistors (MOSFETs).

[0064] In one embodiment, Figure 1 As shown, the converter may further include a clamping capacitor 15; a first end of the clamping capacitor 15 is connected to the second end of the first clamping power electronic device 13 and the second clamping power electronic device 14; and a second end of the clamping capacitor 15 is connected to the second end of the DC input terminal.

[0065] in, Figure 1Cclamp in the figure is the clamping capacitor 15. Connecting a larger clamping capacitor 15 to the drain of the power electronic device and connecting it through the first clamping power electronic device 13 and the second clamping power electronic device 14 can clamp the maximum voltage of the first power electronic device 121 and the second power electronic device 122 when they are turned off to the capacitor voltage value of the clamping capacitor 15, effectively preventing overvoltage damage to the first power electronic device 121 and the second power electronic device 122. This enables zero-voltage turn-on and zero-voltage turn-off of the first clamping power electronic device 13 and the second clamping power electronic device 14, effectively reducing the switching loss of the power electronic device without affecting the operating characteristics of the converter. While improving the converter circuit efficiency, it also effectively reduces the ringing voltage amplitude.

[0066] In one embodiment, the primary windings 123 and secondary windings 124 of the push-pull circuits 12 are wound on the edge magnetic poles of the EI core; the primary windings 123 and secondary windings 124 of the flyback circuit 11 are wound on the middle magnetic pole of the EI core.

[0067] In this embodiment, please refer to the attached Figure 3 , Figure 3 FIG. 1 is a schematic diagram of a magnetic integration structure of an isolated Weinberg converter according to an embodiment of the present application. Figure 3 As shown, multiple sets of push-pull circuit windings 12 are wound on both sides of the EI core. The flyback circuit winding 11 is also wound around the center leg of the core. This achieves decoupled magnetic integration of the flyback circuit 11 and the push-pull circuit 12 of the isolated Weinberg converter, effectively reducing the number of transformers in the converter, reducing the converter's size, and improving the converter's power density. Np represents the primary winding, and Ns represents the secondary winding.

[0068] In one embodiment, the converter may further include an input capacitor 16; the input capacitor 16 may be connected in parallel with the DC input terminal. Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 Cin in FIG. 1 is the input capacitor 16 .

[0069] In one embodiment, the converter may further include an output capacitor 17, which may be connected in parallel with the DC output terminal. Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 Cout in FIG. 1 is the output capacitor 17 .

[0070] Furthermore, the present application also provides a control method for an isolated Weinberg converter.

[0071] See attached Figure 4 , Figure 4 FIG. 1 is a flow chart showing the main steps of a control method for an isolated Weinberg converter according to an embodiment of the present application. Figure 4 As shown, the isolated Weinberg converter in the embodiment of the present application is the converter described in the above-mentioned isolated Weinberg converter embodiment. The control method of the isolated Weinberg converter in the embodiment of the present application mainly includes the following step S101.

[0072] Step S101: Controlling the power electronic devices to be turned on in sequence according to a phase difference of 2π / N to achieve control of the converter; wherein N is the number of bridge arms formed by the power electronic devices in the parallel push-pull circuit in the converter.

[0073] In this embodiment, each power electronic device is turned on in sequence with a phase difference of 2π / N, and the on-time of each power electronic device is dT / N. Under the premise that the operating frequency of each power electronic device remains unchanged, the on-time of each power electronic device can be shortened. The actual operating frequency of the converter is N times the switching frequency of the power electronic device. The more power electronic devices there are, the faster the equivalent operating frequency of the converter is, which can achieve the purpose of reducing the volume of the converter while improving the power density of the converter.

[0074] 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.

[0075] It will be understood by those skilled in the art that all or part of the processes in the method for implementing the above embodiment of the present application can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by a processor, it can implement the steps of the above-mentioned various method embodiments. The computer program includes computer program code, which can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may include: any entity or device, medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electric carrier signal, telecommunication signal and software distribution medium, etc. that can carry the computer program code.

[0076] Another aspect of the present application provides a computer-readable storage medium.

[0077] 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 of the isolated Weinberg converter of the above-mentioned method embodiment, and the program can be loaded and run by the processor to implement the control method of the above-mentioned isolated Weinberg converter. For ease of explanation, only the parts related to the embodiment of the present application are shown. For specific technical details not disclosed, please refer to the method part of the embodiment of the present application. The computer-readable storage medium can be a storage device formed by various electronic devices, such as a magnetic disk, a hard disk, an optical disk, a flash memory, a read-only memory, a random access memory, etc. Optionally, the computer-readable storage medium in the embodiment of the present application is a non-temporary computer-readable storage medium.

[0078] Another aspect of the present application also provides a controller.

[0079] 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 control method of the isolated Weinberg converter described in any embodiment of the control method of the isolated Weinberg converter is implemented.

[0080] In some embodiments of the present application, the controller of the present application may be, but is not limited to, a mobile phone, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an in-vehicle device, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), an augmented reality (AR) or virtual reality (VR) device, etc., and the embodiments of the present application are not limited thereto.

[0081] 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. An isolated Weinberg converter, characterized in that: The converter comprises: Flyback circuit and multiple parallel push-pull circuits; The flyback circuit and the plurality of push-pull circuits are connected in series at the DC input end and in parallel at the DC output end; The primary circuit of each push-pull circuit includes a first power electronic device, a second power electronic device, and a primary winding; the first end of the first power electronic device is connected to the first end of the primary winding; the first end of the second power electronic device is connected to the second end of the primary winding; the second ends of the first power electronic device and the second power electronic device are connected to each other and then to the second end of the DC input terminal; The primary first end of the flyback circuit is connected to the first end of the DC input end; The second primary end of the flyback circuit is connected to the middle tap of the primary windings of the plurality of push-pull circuits; The secondary circuit of each push-pull circuit includes a first secondary diode, a second secondary diode, and a secondary winding; the first end of the secondary winding is connected to the first end of the first secondary diode; the second end of the secondary winding is connected to the first end of the second secondary diode; the second ends of the first secondary diode and the second secondary diode are connected to each other and then to the first end of the DC output end; The first end of the secondary side of the flyback circuit is connected to the first end of the DC output end; The second end of the secondary side of the flyback circuit is connected to the secondary windings of the plurality of push-pull circuits.

2. The isolated Weinberg converter according to claim 1, wherein: The secondary circuit of the push-pull circuit further includes a third secondary diode and a fourth secondary diode; The first end of each secondary winding is connected to the second end of the secondary side of the flyback circuit through the third secondary side diode; The second end of each secondary winding is connected to the second end of the secondary side of the flyback circuit through the fourth secondary diode; The middle taps of the plurality of secondary windings are connected to each other and then to the second end of the DC output end.

3. The isolated Weinberg converter according to claim 1, wherein: The secondary side circuit of the push-pull circuit further includes a fifth secondary side diode; The middle taps of the plurality of secondary windings are connected to each other and then to the first end of the fifth secondary diode; The second end of the fifth secondary diode is connected to the second end of the secondary side of the flyback circuit.

4. The isolated Weinberg converter according to any one of claims 1 to 3, characterized in that: The converter further comprises a first clamping power electronic device and a second clamping power electronic device; The first end of the first clamping power electronic device is connected to the first end of each primary winding; The first end of the second clamping power electronic device is connected to the second end of each primary winding; The second ends of the first clamping power electronic device and the second power electronic device are connected to each other and then to the second end of the DC input end.

5. The isolated Weinberg converter according to claim 4, wherein: The converter further includes a clamping capacitor; a first end of the clamping capacitor and second ends of the first clamping power electronic device and the second clamping power electronic device; The second end of the clamping capacitor is connected to the second end of the DC input end.

6. The isolated Weinberg converter according to any one of claims 1 to 3, characterized in that: The primary windings and secondary windings of the plurality of push-pull circuits are wound on the edge magnetic columns of the EI magnetic core; The primary winding and the secondary winding of the flyback circuit are wound on the middle magnetic column of the EI magnetic core.

7. The isolated Weinberg converter according to any one of claims 1 to 3, characterized in that: The converter further includes an input capacitor; The input capacitor is connected in parallel with the DC input terminal; and / or, The converter further includes an output capacitor; The output capacitor is connected in parallel with the DC output terminal.

8. A control method for an isolated Weinberg converter, characterized in that: The isolated Weinberg converter is a converter according to any one of claims 1 to 7; The method comprises: Controlling the power electronic devices to be turned on in sequence according to a phase difference of 2π / N to achieve control of the converter; Wherein, N is the number of bridge arms formed by power electronic devices in the push-pull circuit connected in parallel in the converter.

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 isolated Weinberg 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 isolated Weinberg converter according to claim 8 .

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