Multipath flyback converter and three-phase power converter

Abstract

The invention provides a multi-path flyback converter and a three-phase power converter. The multi-path flyback converter comprises a primary side feedback module, a plurality of transformers and a plurality of driving power supply modules, the plurality of transformers are arranged in a split manner; the transformers and the driving power supply modules are arranged in a one-to-one correspondence manner; the driving power supply module is connected with a secondary winding of the corresponding transformer; the primary side feedback module comprises a feedback winding and a feedback control circuit, the feedback winding is arranged on the primary side of any transformer, the input end of the feedback control circuit is connected with the feedback winding, the output end of the feedback control circuit is connected with the primary side windings of the transformers, and the output end of the feedback control circuit is connected with the primary side windings of the transformers. The feedback control circuit adjusts the input of the primary windings of the plurality of transformers based on the feedback output signal of the feedback winding. According to the configuration, the PCB wiring of the high-voltage area can be simplified, the PCB wiring difficulty is effectively reduced, noise and interference are reduced, and the cost is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flyback converters, and in particular to a multi-path flyback converter and a three-phase power converter. Background Art

[0002] In power converters used in high-voltage and high-power applications, isolated power supplies are often required to power the driver chip. Currently, isolated power supplies generally use circuit topologies with transformers to achieve effective insulation between the high-voltage and low-voltage sides through the relationship between electricity and magnetism. Figure 1 As shown, in some applications of three-phase power converters, the driver chips 04 of the three power switch devices 03 (such as IGBT) of the upper bridge arm 01 and the lower bridge arm 02 respectively need to be powered by isolated power supplies (not shown). In some applications with higher safety requirements, the power supply of the driver chip 04 of each power switch device 03 needs to be independent of each other.

[0003] Flyback converters are widely used in the power supply system of driver chips due to their simple structure and ability to achieve insulation isolation between input and output. Flyback converters include primary-side feedback and secondary-side feedback. The secondary-side feedback form has higher output voltage accuracy and better no-load and full-load characteristics, but requires an optocoupler to achieve this. The life and reliability of optocouplers are difficult to guarantee, so they are not suitable for applications with high reliability requirements such as vehicles.

[0004] The primary-side feedback flyback converter obtains the feedback voltage through the feedback winding set on the primary side of the transformer. This feedback method has a higher life and reliability. When used in three-phase power converter applications, in order to reduce costs, the flyback converters of the upper bridge or lower bridge are generally combined into a transformer. Figure 2 The structure shown. The advantage of this structure is that it includes an integrated transformer 05, which can reduce the board space and has a low cost. However, since the outputs of the three supply driver chips are obtained by an integrated transformer 05, the power supply output line on the high-voltage side of the power converter needs to be routed for a long time to the other two driver chips. In PCB design, due to the requirements of safe spacing, the routing is difficult and easily causes interference. Summary of the invention

[0005] The object of the present invention is to provide a multi-channel flyback converter and a three-phase power converter to solve the problem of long power supply output wiring of the existing multi-channel flyback converter.

[0006] In order to solve the above technical problems, the present invention provides a multi-channel flyback converter, which includes: a primary feedback module, a plurality of transformers and a plurality of drive power supply modules; A plurality of transformers are separately arranged; the transformers are arranged in one-to-one correspondence with the driving power supply modules; the driving power supply modules are connected to the secondary windings of the corresponding transformers; The primary feedback module includes a feedback winding and a feedback control circuit. The feedback winding is arranged on the primary side of any one of the transformers. The input end of the feedback control circuit is connected to the feedback winding. The output end of the feedback control circuit is respectively connected to the primary windings of multiple transformers. The feedback control circuit adjusts the input of the primary windings of multiple transformers based on the feedback output signal of the feedback winding.

[0007] Optionally, each of the transformers includes two independent secondary windings, each of the driving power supply modules includes two power supply units, each of the power supply units includes a positive voltage stabilizing device, and the two power supply units are respectively connected to the two secondary windings to obtain positive and negative voltages respectively.

[0008] Optionally, each of the power supply units includes a positive voltage LDO, and the input ends of the positive voltage LDOs of the two power supply units are respectively connected to the same-name ends of the two secondary windings; wherein the ground end of the positive voltage LDO of the first power supply unit is connected to the output end of the positive voltage LDO of the second power supply unit and serves as the output ground.

[0009] Optionally, the output end of the positive voltage LDO of the first power supply unit serves as the output positive electrode, and the ground end of the positive voltage LDO of the second power supply unit serves as the output negative electrode.

[0010] Optionally, the input end of the positive voltage LDO of the first power supply unit is connected to one of the secondary windings through a first diode, and the ground end of the positive voltage LDO of the second power supply unit is connected to another of the secondary windings through a second diode.

[0011] Optionally, the anode of the first diode is connected to the secondary winding, and the cathode of the first diode is connected to the input end of the positive voltage LDO of the first power supply unit; the cathode of the second diode is connected to the other secondary winding, and the anode of the second diode is connected to the ground end of the positive voltage LDO of the second power supply unit.

[0012] Optionally, the specifications of the multiple transformers are the same.

[0013] Optionally, the primary winding of the transformer without the feedback winding is configured for open-loop control.

[0014] In order to solve the above technical problems, the present invention also provides a three-phase power converter, which includes the multi-way flyback converter as described above, and also includes a three-phase power circuit; each phase power circuit includes an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm respectively include a driver chip, and the multi-way flyback converter includes six of the transformers and six of the drive power supply modules, and the six drive power supply modules respectively supply power to the six drive chips of the three-phase power circuit.

[0015] In order to solve the above technical problems, the present invention also provides a three-phase power converter, which includes two multi-way flyback converters as described above, and also includes a three-phase power circuit; each phase power circuit includes an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm respectively include a driving chip; Each of the multi-channel flyback converters includes three transformers and three drive power supply modules, wherein the three drive power supply modules of one multi-channel flyback converter supply power to the three drive chips of the upper bridge arm, and the three drive power supply modules of another multi-channel flyback converter supply power to the three drive chips of the lower bridge arm.

[0016] To summarize, in the multi-channel flyback converter and the three-phase power converter provided by the present invention, the multi-channel flyback converter includes a primary feedback module, multiple transformers and multiple drive power supply modules; the multiple transformers are separately arranged; the transformers and the drive power supply modules are arranged one-to-one; the drive power supply module is connected to the secondary winding of the corresponding transformer; the primary feedback module includes a feedback winding and a feedback control circuit, the feedback winding is arranged at the primary side of any one of the transformers, the input end of the feedback control circuit is connected to the feedback winding, the output end of the feedback control circuit is respectively connected to the primary windings of the multiple transformers, and the feedback control circuit adjusts the input of the primary windings of the multiple transformers based on the feedback output signal of the feedback winding.

[0017] With this configuration, the integrated transformer is split into multiple transformers, and multiple transformers are separately set up to form a parallel relationship. In this way, each transformer can be arranged at the driver chip end in different high-voltage areas, which can simplify the PCB wiring in the high-voltage area, effectively reduce the difficulty of PCB wiring, reduce noise and interference, and improve the stability of the driver chip. On the other hand, multiple transformers share a primary feedback module, and there is no need to set primary feedback for each transformer separately, which effectively reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Those skilled in the art will appreciate that the drawings are provided for a better understanding of the present invention, but do not constitute any limitation on the scope of the present invention.

[0019] Figure 1It is a schematic diagram of a three-phase power converter.

[0020] Figure 2 It is a schematic diagram of a multi-channel flyback converter.

[0021] Figure 3 Schematic diagram of a multi-channel flyback converter according to an embodiment of the present invention.

[0022] In the attached figure: 01-upper bridge arm; 02-lower bridge arm; 03-power switch device; 04-driver chip; 05-integrated transformer; 06-center tap; 10-primary feedback module; 11-feedback winding; 12-feedback control circuit; 20-transformer; 21-primary winding; 22-secondary winding; 30-drive power supply module; 31-power supply unit. DETAILED DESCRIPTION

[0023] In order to make the purpose, advantages and features of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the drawings are all in a very simplified form and are not drawn to scale, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. In addition, the structure shown in the drawings is often a part of the actual structure. In particular, the emphasis of each drawing is different, and sometimes different scales are used.

[0024] As used in the present invention, the singular forms "a", "an", "one" and "the" include plural objects, the term "or" is usually used to include the meaning of "and / or", the term "several" is usually used to include the meaning of "at least one", and the term "at least two" is usually used to include the meaning of "two or more". In addition, the terms "first", "second" and "third" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" and "third" may explicitly or implicitly include one or at least two of the features, "one end" and "the other end" as well as "proximal end" and "distal end" generally refer to two corresponding parts, which include not only endpoints. In addition, as used in the present invention, "installed", "connected", "connected", and one element "set" on another element should be understood in a broad sense, usually only indicating that there is a connection, coupling, cooperation or transmission relationship between the two elements, and the connection, coupling, cooperation or transmission between the two elements can be direct or indirect through an intermediate element, and cannot be understood as indicating or implying the spatial position relationship between the two elements, that is, one element can be in any orientation such as inside, outside, above, below or one side of another element, unless the content clearly indicates otherwise. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, directional terms such as above, below, up, down, upward, downward, left, right, etc. are used relative to the exemplary embodiments as shown in the figures, with the upward or upper direction toward the top of the corresponding figure, and the downward or lower direction toward the bottom of the corresponding figure.

[0025] The object of the present invention is to provide a multi-channel flyback converter and a three-phase power converter to solve the problem of long power supply output wiring of the existing multi-channel flyback converter.

[0026] The inventor has found that the existing multi-channel flyback converter (such as Figure 2 The case shown in the figure usually adopts an integrated transformer design, which has only one integrated transformer 05 to power the three driver chips. This means that the output of the integrated transformer 05 needs to be connected to the three driver chips respectively.

[0027] Since the positions of the three driver chips may be dispersed on the PCB (for example, corresponding to different bridge arms of the three phases), the power supply line output from the integrated transformer 05 needs to be extended to the position of each driver chip. If the integrated transformer 05 is located close to one of the driver chips, the power supply lines of the other two driver chips need to be laid out with longer traces to connect to the position of the integrated transformer.

[0028] Those skilled in the art know that in a three-phase power converter, each driver chip is generally located on the high-voltage side. Since the operating voltage on the high-voltage side is higher, the wiring on the high-voltage side needs to meet certain creepage distance and electrical clearance requirements to avoid high-voltage breakdown or arc discharge. Due to the scattered locations of the three driver chips, the power supply line may need to bypass other components or wiring, which will result in a longer wiring path and further increase the complexity of the PCB layout. In addition, longer power supply lines may introduce more noise and interference, affecting the stability of the driver chip.

[0029] For flexible PCB layout, please refer to Figure 3 The embodiment of the present invention provides a multi-channel flyback converter, which includes: a primary feedback module 10, a plurality of transformers 20 and a plurality of drive power supply modules 30; the plurality of transformers 20 are separately arranged; the transformers 20 and the drive power supply modules 30 are arranged one by one; the drive power supply module 30 is connected to the secondary winding 22 of the corresponding transformer 20; the primary feedback module 10 includes a feedback winding 11 and a feedback control circuit 12, the feedback winding 11 is arranged at the primary side of any of the transformers 20, the input end of the feedback control circuit 12 is connected to the feedback winding 11, the output end of the feedback control circuit 12 is respectively connected to the primary windings 21 of the plurality of transformers 20, and the feedback control circuit 12 adjusts the input of the primary windings 21 of the plurality of transformers 20 based on the feedback output signal of the feedback winding 11.

[0030] In the multi-channel flyback converter provided by the embodiment of the present invention, the integrated transformer is split into multiple transformers 20, and the multiple transformers 20 are separately arranged to form a parallel relationship, so that each transformer 20 can be arranged at the driver chip end of different high-voltage areas, thereby allowing flexible wiring, simplifying the PCB wiring in the high-voltage area, effectively reducing the difficulty of PCB wiring, reducing noise and interference, and improving the stability of the driver chip. On the other hand, multiple transformers 20 can share a primary feedback module 10, and there is no need to set primary feedback for each transformer 20, which effectively reduces the cost.

[0031] Figure 3The multi-way flyback converter shown includes three outputs, which can be used to supply power to three driver chips of different phases (such as ABC phases) of a bridge arm (such as an upper bridge arm or a lower bridge arm) of a three-phase power converter, for example. In high-voltage and high-power application scenarios (such as vehicles), the driver chips of power switching devices (such as MOSFET or IGBT) often require positive and negative voltage power supply, wherein the negative voltage can be used to quickly shut down the power switching device, for example. It should be noted that in the multi-way flyback converter provided in the embodiment of the present invention, the number of transformers 20 and drive power supply modules 30 is not limited to three, and can be, for example, two, four, five, six or more, and the number can be arranged according to functional requirements, which is not limited in this embodiment.

[0032] Corresponding to the three-way output, the multi-way flyback converter includes three transformers 20 and corresponding three drive power supply modules 30. It can be understood that each transformer 20 includes a primary winding 21 and a secondary winding 22. Figure 3 In the illustrated example, the primary feedback module 10 includes a feedback winding 11 , which can be wound around the primary side of any transformer 20 .

[0033] The main function of the feedback winding 11 is to detect changes in the feedback voltage and output these changes to the feedback control circuit 12. Since the parameters such as the number of turns of the primary winding 21 and the feedback winding 11 of the transformer 20 are fixed after the transformer 20 is designed and manufactured, the voltage of the primary winding 21 can be known by detecting the change in the feedback voltage of the feedback winding 11, so that the input of the primary winding 21 is controlled and adjusted by the feedback control circuit 12, and the output of the secondary winding 22 is controlled and adjusted. The specific principle can be referred to the prior art, and will not be described in detail here.

[0034] In an alternative example, the primary winding 21 of the transformer 20 without the feedback winding 11 is configured for open loop control. Figure 3 , the first transformer 20 from the top is provided with a feedback winding 11 (or its feedback winding 11 is connected to the feedback control circuit 12), and the primary winding 21 of the transformer 20 is substantially configured for closed-loop control, that is, the feedback winding 11 actually reflects the voltage change of the primary winding 21 of the transformer 20. The second transformer 20 and the third transformer 20 from the top may not be provided with a feedback winding 11 (or their feedback winding 11 is not connected to the feedback control circuit 12), and at this time, it is considered that these two transformers 20 are not provided with a feedback winding 11, and their primary windings 21 are substantially configured for open-loop control, and their input control depends on the feedback control circuit 12.

[0035] The inventor has found that in multiple transformers 20 arranged in parallel, especially in the application of three-phase power converters, although there are three independent transformers 20 and drive power supply modules 30, since their outputs are usually synchronized and balanced, one feedback winding 11 is sufficient to provide sufficient feedback information to adjust the output voltage of the entire system, or to integrate the output voltage information of the three phases in some way. Therefore, only one feedback winding 11 and feedback control circuit 12 can be set, without the need to set an independent feedback winding 11 and feedback control circuit 12 for each phase. This can simplify the design and reduce costs, while still meeting the requirements of output voltage accuracy.

[0036] Preferably, the specifications of the plurality of transformers 20 are the same. Here, the same specifications of the plurality of transformers 20 means that the parameters such as the number of turns and wire diameter of the primary windings 21 and the secondary windings 22 of the plurality of transformers 20 are the same. Since the primary side of at least one of the transformers 20 also has a feedback winding 11, in order to simplify manufacturing, in some embodiments, all transformers 20 can be uniformly designed to include a feedback winding 11. In actual use, the feedback winding 11 of one of the transformers 20 is selected to be connected to the feedback control circuit 12, and the feedback windings 11 of the other transformers 20 are left hanging (such as Figure 3 ). With such configuration, the model of all transformers 20 can be the same. Of course, in other embodiments, it is also possible to distinguish between transformers 20 with feedback windings 11 and transformers 20 without feedback windings 11, that is, to distinguish between two models. However, the other parameters of the two models of transformers 20 are the same except for the feedback windings 11, and they should still be regarded as the same specifications. It is easy to understand that transformers 20 of the same specifications are easier to keep consistent in application, especially when used under the control of a single primary feedback module 10 as in this embodiment.

[0037] The inventors further discovered that when using primary feedback, in order to meet the requirements of no-load and full-load output voltage accuracy, the secondary output of the transformer 20 generally needs to be stabilized by a voltage stabilizer. The voltage stabilizer can be, for example, a low-dropout linear regulator (LDO). As mentioned above, the driver chip of the power switching device often requires positive and negative voltages. In order to obtain positive and negative voltages, a common setting method is to set the secondary winding 22 of the transformer 20 to a winding with a center tap, such as Figure 2As shown, when there is a center tap 06, positive and negative voltages can be simply obtained through a rectifier circuit, and then the positive and negative voltages can be stabilized respectively using a positive voltage LDO and a negative voltage LDO. A positive voltage LDO refers to an LDO whose output terminal (OUT) potential is higher than its ground terminal (reference ground, GND) potential, while a negative voltage LDO refers to an LDO whose output terminal (OUT) potential is lower than its ground terminal (reference ground, GND) potential. Of course, the secondary winding 22 of the transformer 20 can also be a single winding, and positive and negative voltages can also be obtained through a rectifier circuit and a voltage division circuit, and then the positive and negative voltages can also be stabilized respectively using a positive voltage LDO and a negative voltage LDO. Of course, LDO is not the only option for a voltage stabilizing device. In some other embodiments, a switching regulator or other voltage stabilizing devices with similar functions can also be used.

[0038] Generally, the price of negative voltage stabilizers (whose definition can refer to the description of negative voltage LDO above, i.e., voltage stabilizers with output potential lower than the reference ground potential) is greater than the price of positive voltage stabilizers (whose definition can refer to the description of positive voltage LDO above, i.e., voltage stabilizers with output potential higher than the reference ground potential), and among voltage stabilizers of similar specifications, the performance of negative voltage stabilizers is often weaker than that of positive voltage stabilizers. In order to further reduce the cost, in an optional embodiment, each of the transformers 20 includes two independent secondary windings 22, and each of the driving power supply modules 30 includes two power supply units 31, wherein each power supply unit 31 includes a positive voltage stabilizer, and the two power supply units 31 are respectively connected to the two secondary windings 22 to obtain positive and negative voltages respectively. By setting a double winding on the secondary side of the transformer 20, two isolated outputs can be realized, and the two outputs can each use a positive voltage stabilizer, but may not include a negative voltage stabilizer, and finally the positive and negative voltages are coupled together to realize positive and negative voltage outputs. The double winding configuration has very limited impact on the increase in cost, and the elimination of the negative voltage stabilizer can effectively reduce costs, and reduce the types of components during circuit design and manufacturing, facilitating the unification of specifications and parameters. It should be noted that the positive voltage stabilizer here is not limited to a single integrated voltage stabilizer chip, and in some embodiments it should be understood that it can include a positive voltage stabilizer component assembly formed by combining several discrete components.

[0039] Please refer to Figure 3In one example, LDO is used as a demonstration of a voltage stabilizing device, and each of the power supply units 31 includes a positive voltage LDO, and the input terminals (OUT) of the positive voltage LDOs of the two power supply units 31 are respectively connected to the same-name terminals of the two secondary windings 22; wherein the ground terminal (GND) of the positive voltage LDO (U1) of the first power supply unit 32 is connected to the output terminal (OUT) of the positive voltage LDO (U2) of the second power supply unit 31, and serves as the output ground. Furthermore, the output terminal (OUT) of the positive voltage LDO (U1) of the first power supply unit 31 serves as the output positive electrode, and the ground terminal (GND) of the positive voltage LDO (U2) of the second power supply unit serves as the output negative electrode. Such a configuration realizes that both power supply units 31 only use positive voltage LDOs, and no negative voltage LDO is set, and finally positive and negative voltage outputs are obtained through the coupling of the two power supply units 31.

[0040] Optionally, the input terminal (IN) of the positive voltage LDO (U1) of the first power supply unit 31 is connected to one of the secondary windings 22 through the first diode D1, and the ground terminal (GND) of the positive voltage LDO (U2) of the second power supply unit 31 is connected to the other secondary winding 22 through the second diode D2. Further, the positive electrode of the first diode D1 is connected to the secondary winding 22, and the negative electrode of the first diode D1 is connected to the input terminal (IN) of the positive voltage LDO (U1) of the first power supply unit 31; the negative electrode of the second diode D2 is connected to the other secondary winding 22, and the positive electrode of the second diode D2 is connected to the ground terminal (GND) of the positive voltage LDO (U2) of the second power supply unit 31. The second diode D2 is arranged on the ground terminal (GND) side of the positive voltage LDO (U2), which is conducive to controlling electromagnetic interference (EMI).

[0041] Please refer to Figure 1The embodiment of the present invention further provides a three-phase power converter, which includes the multi-way flyback converter as described above, and also includes three-phase power circuits A, B, and C; each phase power circuit includes an upper bridge arm 01 and a lower bridge arm 02, and the upper bridge arm 01 and the lower bridge arm 02 each include a driver chip 04, and the multi-way flyback converter includes six transformers 20 and six driver power supply modules 30, and the six driver power supply modules 30 respectively supply power to the six driver chips 04 of the three-phase power circuit. In some embodiments, the six transformers 20 and the six driver power supply modules 30 can share the same primary feedback module 10. In other embodiments, the three-phase power converter may include two multi-way flyback converters, wherein each of the multi-way flyback converters includes three transformers 20 and three driver power supply modules 30, wherein the three driver power supply modules 30 of one of the multi-way flyback converters supply power to the three driver chips 04 of the upper bridge arm 01, and the three driver power supply modules 30 of the other multi-way flyback converter supply power to the three driver chips 04 of the lower bridge arm 02. That is, the three transformers 20 and the three driving power supply modules 30 of the upper bridge arm 01 share one primary feedback module 10 , and the three transformers 20 and the three driving power supply modules 30 of the lower bridge arm 02 share one primary feedback module 10 .

[0042] Based on the three-phase power converter as described above, an embodiment of the present invention further provides a vehicle, which includes the three-phase power converter as described above. The vehicle may include a motor (such as a new energy vehicle), which uses the three-phase power converter as described above to drive the motor or generate electricity. Of course, the present invention does not limit the function of the motor on the vehicle, and it does not have to be used to drive the vehicle to run.

[0043] In summary, in the multi-channel flyback converter and the three-phase power converter provided by the present invention, the multi-channel flyback converter includes a primary feedback module, a plurality of transformers and a plurality of drive power supply modules; the plurality of transformers are separately arranged; the transformers are arranged one by one with the drive power supply modules; the drive power supply module is connected to the secondary winding of the corresponding transformer; the primary feedback module includes a feedback winding and a feedback control circuit, the feedback winding is arranged at the primary side of any of the transformers, the input end of the feedback control circuit is connected to the feedback winding, the output end of the feedback control circuit is respectively connected to the primary windings of the plurality of transformers, and the feedback control circuit adjusts the input of the primary windings of the plurality of transformers based on the feedback output signal of the feedback winding. In this configuration, by splitting the integrated transformer into a plurality of transformers, the plurality of transformers are separately arranged to form a parallel relationship, so that each transformer can be arranged at the drive chip end of different high-voltage areas, which can simplify the PCB wiring in the high-voltage area, effectively reduce the difficulty of PCB wiring, reduce noise and interference, and improve the stability of the drive chip. On the other hand, a plurality of transformers share a primary feedback module, and there is no need to set primary feedback for each transformer, which effectively reduces the cost.

[0044] It should be noted that the above embodiments can be combined with each other. The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention. Any changes and modifications made by ordinary technicians in the field of the present invention based on the above disclosure are within the protection scope of the present invention.

Claims

1. A multi-channel flyback converter, characterized in that: include: A primary feedback module, multiple transformers, and multiple drive power supply modules; A plurality of said transformers are separately arranged; The transformer is arranged in one-to-one correspondence with the driving power supply module; The driving power supply module is connected to the corresponding secondary winding of the transformer; The primary feedback module includes a feedback winding and a feedback control circuit. The feedback winding is arranged on the primary side of any one of the transformers. The input end of the feedback control circuit is connected to the feedback winding. The output end of the feedback control circuit is respectively connected to the primary windings of multiple transformers. The feedback control circuit adjusts the input of the primary windings of multiple transformers based on the feedback output signal of the feedback winding.

2. The multi-channel flyback converter according to claim 1, characterized in that: Each of the transformers includes two independent secondary windings, each of the driving power supply modules includes two power supply units, each of the power supply units includes a positive voltage stabilizing device, and the two power supply units are respectively connected to the two secondary windings to obtain positive and negative voltages respectively.

3. The multi-channel flyback converter according to claim 2, characterized in that: Each of the power supply units includes a positive voltage LDO, and the input ends of the positive voltage LDOs of the two power supply units are respectively connected to the same-name ends of the two secondary windings; wherein the ground end of the positive voltage LDO of the first power supply unit is connected to the output end of the positive voltage LDO of the second power supply unit and serves as the output ground.

4. The multi-channel flyback converter according to claim 3, characterized in that: The output end of the positive voltage LDO of the first power supply unit serves as an output positive electrode, and the ground end of the positive voltage LDO of the second power supply unit serves as an output negative electrode.

5. The multi-channel flyback converter according to claim 3, characterized in that: The input end of the positive voltage LDO of the first power supply unit is connected to one of the secondary windings through a first diode, and the ground end of the positive voltage LDO of the second power supply unit is connected to the other secondary winding through a second diode.

6. The multi-channel flyback converter according to claim 5, characterized in that: The anode of the first diode is connected to the secondary winding, and the cathode of the first diode is connected to the input end of the positive voltage LDO of the first power supply unit; the cathode of the second diode is connected to the other secondary winding, and the anode of the second diode is connected to the ground end of the positive voltage LDO of the second power supply unit.

7. The multi-channel flyback converter according to claim 1, characterized in that: The specifications of the multiple transformers are the same.

8. The multi-channel flyback converter according to claim 1, characterized in that: The primary winding of the transformer without the feedback winding is configured for open-loop control.

9. A three-phase power converter, characterized in that: It comprises a multi-channel flyback converter according to any one of claims 1 to 8, and also comprises a three-phase power circuit; each phase power circuit comprises an upper bridge arm and a lower bridge arm, the upper bridge arm and the lower bridge arm respectively comprise a driver chip, the multi-channel flyback converter comprises six of the transformers and six of the driver power supply modules, and the six of the driver power supply modules respectively supply power to the six of the driver chips of the three-phase power circuit.

10. A three-phase power converter, characterized in that: The invention comprises two multi-channel flyback converters according to any one of claims 1 to 8, and further comprises a three-phase power circuit; each phase power circuit comprises an upper bridge arm and a lower bridge arm, and the upper bridge arm and the lower bridge arm respectively comprise a driving chip; Each of the multi-channel flyback converters includes three transformers and three drive power supply modules, wherein the three drive power supply modules of one multi-channel flyback converter supply power to the three drive chips of the upper bridge arm, and the three drive power supply modules of another multi-channel flyback converter supply power to the three drive chips of the lower bridge arm.

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