CN114726227A - Flyback circuit and power supply - Google Patents
Flyback circuit and power supply Download PDFInfo
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- CN114726227A CN114726227A CN202210640680.8A CN202210640680A CN114726227A CN 114726227 A CN114726227 A CN 114726227A CN 202210640680 A CN202210640680 A CN 202210640680A CN 114726227 A CN114726227 A CN 114726227A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The embodiment of the invention discloses a flyback circuit and a power supply. The flyback circuit includes: an input loop and an output loop; the flyback circuit further includes: at least two first switch modules and at least two transformers; the primary side of each transformer comprises at least two primary windings; the input loop comprises at least two series branches connected in parallel; the input loop is used for providing multi-path electric energy input for each transformer; each series branch comprises N-1 first switch modules connected between N primary windings of at least two transformers; the first switch module is used for connecting the N primary windings connected through the first switch module in series when the first switch module is conducted according to the first control signal; the output loop comprises at least two output branches connected in parallel or in series; the output branch is used for controlling the energy storage or the energy discharge of the transformer; wherein N is a positive integer greater than or equal to 2. Compared with a half-bridge structure designed circuit, the circuit has the advantages that the cost of devices required by the circuit design is low, and the control mode is simpler.
Description
Technical Field
The embodiment of the invention relates to the technical field of power supplies, in particular to a flyback circuit and a power supply.
Background
At present, the photovoltaic system panel can output 1500V of voltage at most. However, the required power of the photovoltaic system power supply and the photovoltaic follow spot control power supply is increasing.
At present, a high-power photovoltaic output high-voltage power supply can be designed by adopting a half-bridge structure, but the control of the high-power photovoltaic output high-voltage power supply with the structural design is complicated and the cost is high.
Disclosure of Invention
The embodiment of the invention provides a flyback circuit and a power supply, which are used for reducing the design cost of an output high-power output circuit and simplifying the control of the output high-power output circuit.
In a first aspect, an embodiment of the present invention provides a flyback circuit, which includes: an input loop and an output loop;
the flyback circuit further includes: at least two first switch modules and at least two transformers;
the primary side of each transformer comprises at least two primary windings;
the input loop comprises at least two series branches connected in parallel; the input loop is used for providing multi-path electric energy input for each transformer;
each series branch comprises N-1 first switch modules connected between N primary windings of at least two transformers; the first switch module is used for connecting the N primary windings connected through the first switch module in series when the first switch module is conducted according to the first control signal;
the output loop comprises at least two output branches connected in parallel or in series;
the output branch is used for controlling the energy storage or the energy discharge of the transformer;
wherein N is a positive integer greater than or equal to 2.
Optionally, the input circuit further comprises a second switch module, and the at least two series branches are connected in parallel through the second switch module;
the second switch module is used for connecting the series branches connected with the second switch module in parallel when the second switch module is conducted according to the second control signal.
Optionally, the output branch comprises a secondary winding of the transformer and a current-cut module;
the first end of the secondary winding is connected with the first end of the interception module, or the second end of the secondary winding is connected with the second end of the interception module;
when the first switch module and the second switch module are conducted, the cut-off module is used for controlling the transformer to store energy; when the first switch module and the second switch module are cut off, the interception module is used for controlling the discharge of the transformer.
Optionally, different transformers comprise the same number of primary windings.
Optionally, the primary windings connected to each other on the same series branch are not arranged adjacently on the transformer.
Optionally, the flyback circuit further includes a power module;
the number of the second switch modules is equal to that of the series branches; the first end of each series branch is connected with the positive pole of the power module, and the second end of each series branch is connected with the negative pole of the power module through the second switch module;
the power module is used for providing electric energy for the series branch.
Optionally, the flyback circuit further includes a first filtering module;
the number of the first filtering modules is in one-to-one correspondence with the primary windings, two ends of each first filtering module are respectively connected with two ends of the primary windings, and the first filtering modules connected with two ends of each primary winding on the same series branch are connected in series;
the first filtering module is used for filtering noise waves doped in the voltage input into the primary winding and clamping the voltage at two ends of the primary winding.
Optionally, the output branch further includes a second filtering module;
when the first end of the secondary winding is connected with the first end of the interception module, the first end of the second filtering module is connected with the second end of the interception module, and the second end of the second filtering module is connected with the second end of the secondary winding;
when the second end of the secondary winding is connected with the second end of the interception module, the first end of the second filtering module is connected with the first end of the secondary winding, and the second end of the second filtering module is connected with the first end of the interception module; the second filtering module is used for filtering noise waves doped in the output voltage of the output branch circuit.
Optionally, the shut-off module comprises a diode;
the first end of the secondary winding is connected to the anode of the diode, or the second end of the secondary winding is connected to the cathode of the diode.
In a second aspect, an embodiment of the present invention further provides a power supply, which includes the flyback circuit as set forth in any of the above embodiments.
The flyback circuit provided by the embodiment of the invention can improve the total electric energy input at the primary sides of a plurality of transformers through the input loop, namely the input loop comprises at least two series branches connected in parallel; each series branch comprises N-1 first switch modules connected between N primary windings of at least two transformers; the first switch module is used for connecting the N primary windings connected through the first switch module in series when the first switch module is conducted according to the first control signal. Therefore, the voltage input by each series branch is the same, so that the input loop can provide multiple paths of electric energy input for each transformer through a plurality of series branches, and the total electric energy input by the primary sides of all the transformers is improved. The output loop is formed by connecting output branches on the secondary side of each transformer in parallel or in series. The electric energy input by the primary side of each transformer can be transmitted to the secondary side of the transformer through electromagnetic induction, and the total electric energy input by the primary sides of all the transformers is increased, so that the total electric energy output by the secondary sides of all the transformers is increased, and the electric power output by the output loop is increased. According to the connection relation, compared with a circuit designed in a half-bridge structure, the circuit is simpler, and the cost of devices required by design is lower. In addition, the scheme can control the input circuit to input electric energy to each transformer and control the output circuit to output electric power through each series branch only by controlling to simultaneously send the first control signal to each first switch module. Therefore, compared with the control of the half-bridge structure, the control mode of the design is simpler.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a flyback circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the structure of the serial branch in FIG. 1 or FIG. 2;
fig. 4 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of the series circuit of FIG. 4;
fig. 6 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 14 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a power supply according to an embodiment of the invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
An embodiment of the present invention provides a flyback circuit, where fig. 1 is a schematic structural diagram of a flyback circuit provided in an embodiment of the present invention, fig. 2 is a schematic structural diagram of another flyback circuit provided in an embodiment of the present invention, fig. 3 is a schematic structural diagram of a series branch in fig. 1 or fig. 2, and the flyback circuit may include an input loop 100 and an output loop 200; the flyback circuit may further include: at least two first switch modules 111 and at least two transformers; the primary side of each transformer comprises at least two primary windings 112; the input circuit 100 comprises at least two series branches 110 connected in parallel; the input loop 100 is used for providing multiple paths of electric energy input for each transformer; each series branch 110 comprises N-1 first switching modules 111 connected between N primary windings 112 of at least two transformers; the first switch module 111 is configured to connect the N primary windings 112 connected through the first switch module 111 in series when turned on according to the first control signal; the output circuit 200 includes at least two output branches 210 connected in parallel or in series; the output branch 210 is used for controlling the energy storage or the energy discharge of the transformer; wherein N is a positive integer greater than or equal to 2.
The flyback circuit mainly realizes high-power output of the flyback circuit by connecting a plurality of transformers in parallel. The input circuit 100 of the flyback circuit is a circuit connection circuit of the primary sides of a plurality of transformers. Specifically, the input circuit 100 is formed by at least two series branches 110 connected in parallel, and N-1 first switch modules 111 of each series branch 110 are connected between N primary windings 112 of at least two transformers, where N is a positive integer greater than or equal to 2. If the third terminal of the first switch module 111 receives the first control signal, the two terminals of the first switch module 111 connected to the primary windings 112 are connected, so that the N primary windings 112 connected through the first switch module 111 are connected in series. Illustratively, the first switch module 111 includes a transistor, a first terminal and a second terminal of the transistor are connected to the primary winding 112, and a control terminal of the transistor serves as a third terminal of the second switch module. If the third end of the first switch module 111 receives the first control signal, the two ends of the first switch module 111 connected to the primary windings 112 are turned on, and at this time, the N primary windings 112 connected to the first switch module 111 are connected in series, so that the input circuit 100 can provide multiple paths of electric energy input for each transformer through each series branch 110.
Furthermore, the input circuit 100 is formed by connecting at least two series branches 110 in parallel or in series, the input circuit 100 is formed by connecting at least two series branches 110 in parallel in fig. 1, and the input circuit 100 is formed by connecting at least two series branches 110 in series in fig. 2. The voltage input to each series branch 110 of the input circuit 100 is the same, so that the input circuit 100 can provide multiple power inputs to each transformer through multiple series branches 110, thereby increasing the total power input to the primary side of all transformers. The output circuit 200 is formed by connecting output branches 210 on the secondary side of each transformer in parallel or in series. The electric energy input to the primary side of each transformer can be transmitted to the secondary side of the transformer through electromagnetic induction, and the total electric energy input to the primary side of all the transformers is increased, so that the total electric energy output from the secondary side of all the transformers is increased, and further the electric power output by the output loop 200 is increased.
It should be noted that, the flyback circuit adopts a flyback topology structure, and in the process that the input loop 100 inputs electric energy for each transformer, each output branch 210 of the output loop 200 does not release electric energy along with the input of the electric energy of the input loop 100, and at this time, each output branch 210 can control each transformer to store electric energy; when the input circuit 100 stops inputting power for each transformer, each output branch 210 can control each transformer to discharge power, so that the output power of the output circuit 200 is increased.
The flyback circuit provided by the embodiment of the invention can improve the total electric energy input at the primary side of a plurality of transformers through the input loop, namely the input loop comprises at least two series branches connected in parallel; each series branch comprises N-1 first switch modules which are connected between N primary windings of at least two transformers; the first switch module is used for connecting the N primary windings connected through the first switch module in series when the first switch module is conducted according to the first control signal. Therefore, the voltage input by each series branch is the same, so that the input loop can provide multiple paths of electric energy input for each transformer through a plurality of series branches, and the total electric energy input by the primary sides of all the transformers is improved. The output loop is formed by connecting output branches on the secondary side of each transformer in parallel or in series. The electric energy input by the primary side of each transformer can be transmitted to the secondary side of the transformer through electromagnetic induction, and the total electric energy input by the primary sides of all the transformers is increased, so that the total electric energy output by the secondary sides of all the transformers is increased, and the electric power output by the output loop is increased. According to the connection relation, compared with a circuit designed in a half-bridge structure, the circuit is simpler, and the cost of devices required by design is lower. In addition, the scheme can control the input circuit to input electric energy to each transformer and control the output circuit to output electric power through each series branch only by controlling to simultaneously send the first control signal to each first switch module. Therefore, compared with the control of the half-bridge structure, the control mode of the design is simpler.
For example, fig. 4 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and fig. 5 is a schematic structural diagram of the series branch 110 in fig. 4, as shown in fig. 4-5, the flyback circuit includes two transformers and two first switching modules 111, a primary side of each transformer includes two primary windings 112, and a west side of each transformer includes one output branch 210.
The input circuit 100 includes two series arms 110 shown in fig. 5, and each series arm 110 is a connection line when N is equal to 2. The first series branch 110 is a first primary winding 112 of a first transformer connected to a first primary winding 112 of a second transformer via a first switching module 111; the second series branch 110 is a second primary winding 112 on the first transformer connected to a second primary winding 112 on the second transformer via another first switching module 111. The input circuit 100 comprises two series branches 110 connected in parallel, i.e. a first end of a first primary winding 112 on a first transformer is connected to a first end of a second primary winding 112, and a second end of the first primary winding 112 on the second transformer is connected to a second end of the second primary winding 112. As can be seen from the above connection relationship, the first transformer and the second transformer can both input the electric energy through the first series branch 110 and the second series branch 110, so that the total electric energy input by the primary side of the first transformer and the primary side of the second transformer can be increased. The output loop 200 is a parallel loop of the output branch 210 of the first transformer and the output branch 210 of the second transformer. The electric energy input to the primary side of each transformer can be transmitted to the secondary side of the transformer through electromagnetic induction, and the total electric energy input to the primary side of the first transformer and the primary side of the second transformer is increased, so that the total electric energy output from the secondary side of the first transformer and the secondary side of the second transformer can be increased, and further, the electric power output from the output loop 200 is increased.
Fig. 6 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and as shown in fig. 6, the input circuit 100 further includes a second switch module 113, and at least two series branches are connected in parallel through the second switch module 113; the second switch module 113 is configured to connect the series branches connected to the second switch module 113 in parallel when the second switch module is turned on according to the second control signal.
Specifically, each series branch is connected to a first end of a second switch module 113, and second ends of the second switch modules 113 are connected to each other. The third terminal of the second switch module 113 may receive a second control signal, and the second control module may control the conduction state of the first terminal and the second terminal of the second switch module 113 according to the second control signal. For example, if the second switch modules 113 receive the second control signal and the first ends and the second ends of the second switch modules 113 are connected, the series branches connected to the second switch modules 113 may be connected in parallel by simultaneously sending the second control signal to each of the second switch modules 113. In addition, the second switch module 113 may include a transistor, a first terminal of the transistor is used as the first terminal of the second switch module 113, a second terminal of the transistor is used as the second terminal of the second switch module 113, and a control terminal of the transistor is used as the third terminal of the second switch module 113.
Fig. 6 is a schematic structural diagram of another flyback circuit according to the embodiment of the present invention, and fig. 7 is a schematic structural diagram of another flyback circuit according to the embodiment of the present invention, as shown in fig. 6 to 7, an output branch 210 includes a secondary winding 211 of a transformer and a current-cut module 212; a first end of the secondary winding 211 is connected to a first end of the current intercepting module 212, or a second end of the secondary winding 211 is connected to a second end of the current intercepting module 212; when the first switch module 111 and the second switch module 113 are turned on, the cut-off module 212 is used for controlling the transformer to store energy; the shut-off module 212 is used to control the transformer discharge when the first and second switch modules 111, 113 are turned off.
Specifically, a first end of the secondary winding 211 in fig. 6 is connected with a first end of the current intercepting module 212. In fig. 7, the second end of the secondary winding 211 is connected to the second end of the current intercepting module 212. The current cutoff module 212 may control the direction of current flow in the secondary winding 211. When the first switch module 111 and the second switch module 113 are turned on, the cut-off module 212 may open the output branch 210 where the secondary winding 211 is located, and cannot release the electric energy input to the transformer by the input circuit 100, thereby controlling the transformer to store energy. When the first switch module 111 and the second switch module 113 are turned off, the cut-off module 212 may turn on the output branch 210 where the secondary winding 211 is located, and may release the electric energy input to the transformer by the input circuit 100, thereby controlling the discharge of the output branch 210 of the transformer.
Fig. 8 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and as shown in fig. 9, different transformers include the same number of primary windings 112.
The same number of primary windings 112 included in different transformers can ensure that the voltages input at the primary side of the different transformers are the same, so that the secondary-side output voltages of the transformers are the same. The flyback circuit in fig. 9 includes six first switching modules 111 and two transformers, each of which includes four primary windings 112. The input loop 100 of the flyback circuit includes two series branches. The first series branch comprises 3 first switching modules 111 connected between the first primary winding 112 of the first transformer, the third primary winding 112 of the first transformer, the first primary winding 112 of the second transformer and the third primary winding 112 of the second transformer. The second series branch comprises 3 first switching modules 111 connected between the second primary winding 112 of the first transformer, the fourth primary winding 112 of the first transformer, the second primary winding 112 of the second transformer and the fourth primary winding 112 of the second transformer. Since the voltages inputted to each series branch are equal and each series branch includes four identical primary windings 112, the divided voltages at each primary winding 112 can be made equal, thereby ensuring that the voltages inputted to the primary sides of different transformers are the same.
Alternatively, with continued reference to fig. 9, the interconnected primary windings 112 on the same series branch are not located adjacent to each other on the transformer.
Wherein the coupling degree of the transformer can be adjusted by adjusting the position on the transformer at which the primary windings 112 connected to each other on the same series branch are arranged. The primary windings 112 connected to each other in the same series branch are not arranged adjacently on the transformer, so that the coupling degree of the primary winding 112 on the primary side of the transformer and the secondary winding 211 on the secondary side of the transformer is consistent.
Optionally, with continued reference to fig. 9, the flyback circuit further includes a power module 300; the number of the second switch modules 113 is equal to the number of the series branches; a first end of each series branch is connected with the positive electrode of the power module 300, and a second end of each series branch is connected with the negative electrode of the power module 300 through the second switch module 113; the power module 300 is used to provide power to the serial branches.
Specifically, the power module 300 provides the same voltage to each series branch according to the connection relationship. The number of the second switch modules 113 is equal to the number of the serial branches, a first end of each second switch module 113 is connected to a second end of the serial branch, and a second end of each second switch module 113 is connected to a negative electrode of the power module 300. Therefore, the first series branch is connected in series with a second switch module 113. In addition, the first switch module 111 may be the same as the second switch module 113, and in this design, each series branch employs a plurality of first switch modules 111 and one second switch module 113, so that the first series branch is connected in series with one second switch module 113.
Fig. 10 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and as shown in fig. 10, the flyback circuit further includes a first filtering module 400; the number of the first filtering modules 400 is one-to-one corresponding to the number of the primary windings 112, two ends of each first filtering module 400 are respectively connected with two ends of the primary winding 112, and the first filtering modules 400 connected with two ends of each primary winding 112 on the same serial branch are connected in series; the first filtering module 400 is used for filtering noise doped in the voltage input to the primary winding 112 and clamping the voltage across the primary winding 112.
As can be seen from the above connection relationship, each first filtering module 400 is connected in parallel with the primary winding 112, so that each first filtering module 400 can filter noise doped in the input voltage of the primary winding 112 connected in parallel therewith, thereby ensuring the stability of the voltage input to each primary winding 112.
In addition, the first filtering modules 400 connected to both ends of each primary winding 112 in the same serial branch are connected in series, so that the voltages dropped across both ends of each primary winding 112 in the same serial branch are equal. Each first filtering module 400 is connected in parallel with a primary winding 112, so that each first filtering module 400 can clamp the voltage across the primary winding 112 connected in parallel with it, so as to equalize the voltage across each primary winding 112 on the same series branch.
Fig. 11 is a schematic structural diagram of another flyback circuit according to the embodiment of the present invention, and fig. 12 is a schematic structural diagram of another flyback circuit according to the embodiment of the present invention, as shown in fig. 11-12, the output branch 210 further includes a second filtering module 213; when the first end of the secondary winding 211 is connected with the first end of the interception module 212, the first end of the second filtering module 213 is connected with the second end of the interception module 212, and the second end of the second filtering module 213 is connected with the second end of the secondary winding 211; when the second end of the secondary winding 211 is connected to the second end of the cut-off module 212, the first end of the second filtering module 213 is connected to the first end of the secondary winding 211, and the second end of the second filtering module 213 is connected to the first end of the cut-off module 212; the second filtering module 213 is used for filtering out noise doped in the output voltage of the output branch 210.
Specifically, the second filtering module 213 may filter noise doped in the output voltage of the output branch 210, so as to ensure the stability of the output voltage of the secondary winding 211 of each transformer. In fig. 11, a first end of the secondary winding 211 is connected to a first end of the cutoff module 212, a first end of the second filtering module 213 is connected to a second end of the cutoff module 212, and a second end of the second filtering module 213 is connected to a second end of the secondary winding 211. In fig. 12, the second end of the secondary winding 211 is connected to the second end of the cutoff module 212, the first end of the second filtering module 213 is connected to the first end of the secondary winding 211, and the second end of the second filtering module 213 is connected to the first end of the cutoff module 212.
Fig. 13 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and as shown in fig. 13, the current intercepting module 212 includes a diode D; a first end of the secondary winding 211 is connected to an anode of the diode D, or a second end of the secondary winding 211 is connected to a cathode of the diode D.
Specifically, current may flow from the anode of the diode D to the cathode of the diode D, and current may not flow from the cathode of the diode D to the anode of the diode D. Therefore, according to the connection relationship, when the first switch module 111 and the second switch module 113 are turned on, the diode D may open the output branch 210 where the secondary winding 211 is located, and the input circuit 100 cannot release the electric energy input to the transformer, so as to control the transformer to store energy. When the first switch module 111 and the second switch module 113 are turned off, the diode D may turn on the output branch 210 where the secondary winding 211 is located, and may release the electric energy input to the transformer by the input circuit 100, thereby controlling the transformer to discharge energy.
In addition, the cut-off module may further include synchronous transistors, wherein each transistor is connected in series with a secondary winding, and control terminals of all the transistors are connected to the same signal output terminal of the control chip. When the transistor is not conducted according to the synchronous control signal sent by the control chip, the electric energy input to the transformer by the input loop cannot be released, so that the energy storage of the transformer is controlled. When the transistor is conducted according to the synchronous control signal sent by the control chip, the electric energy input to the transformer by the input loop can be released, and therefore the energy release of the transformer is controlled.
Fig. 14 is a schematic structural diagram of another flyback circuit according to an embodiment of the present invention, and as shown in fig. 14, the flyback circuit includes: an input loop 100 and an output loop 200; the flyback circuit further includes: six first switch modules 111, two second switch modules 113 and two transformers; the primary side of each transformer includes four primary windings 112; the input loop 100 comprises two series branches connected in parallel; the first series branch comprises 3 first switching modules 111 connected between the first primary winding 112 of the first transformer, the third primary winding 112 of the first transformer, the first primary winding 112 of the second transformer and the third primary winding 112 of the second transformer. The second series branch comprises 3 first switching modules 111 connected between the second primary winding 112 of the first transformer, the fourth primary winding 112 of the first transformer, the second primary winding 112 of the second transformer and the fourth primary winding 112 of the second transformer. Each primary winding 112 is connected in parallel with a first filtering module 400, and the primary windings 112 of each series branch are connected in series corresponding to the first filtering modules 400 connected in parallel. The output loop 200 comprises two output branches 210 connected in parallel; each output branch 210 comprises a secondary winding 211 and a cut-off module, a first end of the secondary winding 211 being connected to a first end of the cut-off module. A first end of each series branch is connected to the positive pole of the power module 300, and a second end of each series branch is connected to the negative pole of the power module 300 through the second switch module 113. The first filtering module 400 includes a first capacitor C1, the first switch module 111 and the second switch module 113 are the same and can be metal-oxide semiconductor field effect transistors M with the same specification, the second filtering module 213 includes a second capacitor C2, and the cut-off module includes a diode D.
Fig. 15 is a schematic structural diagram of a power supply according to an embodiment of the present invention, and as shown in fig. 15, the power supply 01 includes a flyback circuit 02 according to any embodiment of the present invention.
The power supply 01 includes the flyback circuit 02 provided in any embodiment of the present invention, and thus has the beneficial effects of the flyback circuit 02 provided in the embodiment of the present invention, which are not described herein again.
It should be understood that various forms of the flows shown above may be used, with steps reordered, added, or deleted. For example, the steps described in the present invention may be executed in parallel, sequentially, or in different orders, and are not limited herein as long as the desired results of the technical solution of the present invention can be achieved.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A flyback circuit, comprising: an input loop and an output loop;
the flyback circuit further includes: at least two first switch modules and at least two transformers;
the primary side of each transformer comprises at least two primary windings;
the input loop comprises at least two series branches connected in parallel; the input loop is used for providing multi-path electric energy input for each transformer;
each series branch comprises N-1 first switch modules connected between N primary windings of at least two transformers; the first switch module is used for connecting the N primary windings connected through the first switch module in series when the first switch module is conducted according to a first control signal;
the output loop comprises at least two output branches connected in parallel or in series;
the output branch is used for controlling the energy storage or release of the transformer;
wherein N is a positive integer greater than or equal to 2.
2. The flyback circuit of claim 1 wherein the input loop further comprises a second switching module, at least two of the series legs being connected in parallel by the second switching module;
and the second switch module is used for connecting the series branches connected with the second switch module in parallel when the second switch module is conducted according to a second control signal.
3. The flyback circuit of claim 2 wherein the output branch comprises a secondary winding of the transformer and a current cutoff module;
the first end of the secondary winding is connected with the first end of the interception module, or the second end of the secondary winding is connected with the second end of the interception module;
when the first switch module and the second switch module are conducted, the cut-off module is used for controlling the transformer to store energy; when the first switch module and the second switch module are cut off, the interception module is used for controlling the discharge of the transformer.
4. The flyback circuit of claim 1 wherein different ones of the transformers include the same number of primary windings.
5. The flyback circuit of claim 1 wherein the primary windings interconnected on the same series leg are not disposed adjacent to each other on the transformer.
6. The flyback circuit of claim 2 further comprising a power module;
the number of the second switch modules is equal to that of the series branches; the first end of each series branch is connected with the positive pole of the power supply module, and the second end of each series branch is connected with the negative pole of the power supply module through the second switch module;
the power module is used for providing electric energy for the series branch.
7. The flyback circuit of claim 1 further comprising a first filtering module;
the number of the first filtering modules is in one-to-one correspondence with the primary windings, two ends of each first filtering module are respectively connected with two ends of the primary windings, and the first filtering modules connected with two ends of each primary winding on the same serial branch are connected in series;
the first filtering module is used for filtering noise waves doped in the voltage input into the primary winding and clamping the voltage at two ends of the primary winding.
8. The flyback circuit of claim 3 wherein the output branch further comprises a second filtering module;
when the first end of the secondary winding is connected with the first end of the interception module, the first end of the second filtering module is connected with the second end of the interception module, and the second end of the second filtering module is connected with the second end of the secondary winding;
when the second end of the secondary winding is connected with the second end of the interception module, the first end of the second filtering module is connected with the first end of the secondary winding, and the second end of the second filtering module is connected with the first end of the interception module; the second filtering module is used for filtering noise waves doped in the output voltage of the output branch circuit.
9. A flyback circuit as in claim 3 wherein the current cutoff module comprises a diode;
the first end of the secondary winding is connected with the anode of the diode, or the second end of the secondary winding is connected with the cathode of the diode.
10. A power supply comprising the flyback circuit of any of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210640680.8A CN114726227B (en) | 2022-06-08 | 2022-06-08 | Flyback circuit and power supply |
| TW111122540A TWI833246B (en) | 2022-06-08 | 2022-06-17 | Flyback circuits and power supplies |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210640680.8A CN114726227B (en) | 2022-06-08 | 2022-06-08 | Flyback circuit and power supply |
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| CN114726227A true CN114726227A (en) | 2022-07-08 |
| CN114726227B CN114726227B (en) | 2022-08-30 |
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| CN202210640680.8A Active CN114726227B (en) | 2022-06-08 | 2022-06-08 | Flyback circuit and power supply |
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| TW (1) | TWI833246B (en) |
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| US8384245B2 (en) * | 2009-05-13 | 2013-02-26 | Solar Semiconductor, Inc. | Methods and apparatuses for photovoltaic power management |
| TWI608696B (en) * | 2016-04-26 | 2017-12-11 | 群光電能科技股份有限公司 | Power conversion system |
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| EP1107438A2 (en) * | 1999-12-10 | 2001-06-13 | ABB Industry Oy | Balancing circuit for voltage division between capacitors |
| CN104852588A (en) * | 2015-06-09 | 2015-08-19 | 黑龙江大学 | Auxiliary power supply suitable for high-voltage input and multi-output occasions |
| TW201924203A (en) * | 2017-10-27 | 2019-06-16 | 新加坡商西拉娜亞洲私人有限公司 | Merged voltage-divider forward converter |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI833246B (en) | 2024-02-21 |
| TW202349839A (en) | 2023-12-16 |
| CN114726227B (en) | 2022-08-30 |
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