Variable voltage circuit structure based on multi-magnetic column transformer and conversion method

Abstract

The application provides a transformer circuit structure based on a multi-magnetic-column transformer and a transformation method, which can be applied to the technical field of voltage transformation. The circuit comprises a full-bridge inverter module for obtaining a high-frequency alternating voltage; the multi-magnetic-column transformer comprises N primary winding groups and M secondary winding groups, the nth primary winding group and two secondary winding groups corresponding to the nth primary winding group are wound on the same magnetic column, the N primary winding groups and the M secondary winding groups are used for transformer processing of the high-frequency alternating voltage to obtain an intermediate alternating voltage; a synchronous rectification module comprises N rectification and filtering submodules and an output submodule in parallel, the input end of the nth rectification and filtering submodule is electrically connected with the two secondary winding groups corresponding to the nth primary winding group, the output end of the nth rectification and filtering submodule is electrically connected with the output submodule, and the N rectification and filtering submodules and the output submodule are used for rectification and filtering processing of the intermediate alternating voltage to obtain and output a target voltage.

Description

Technical Field

[0001] This invention relates to the field of voltage conversion technology, and more specifically to a transformer circuit structure and conversion method based on a multi-column transformer. Background Technology

[0002] Planar transformers are widely used in power supply applications due to their compact structure and good heat dissipation. However, in high-current output scenarios, existing planar transformers are prone to limitations such as large winding copper losses and uneven current distribution.

[0003] In the process of realizing the above-mentioned inventive concept, it was found that in high-frequency and high-current (frequency > 100kHz, current > 50A) application scenarios, existing planar transformers have large winding copper losses, and the current output through the relevant circuits on the secondary winding side is unevenly distributed, which makes the topology circuit prone to local overheating and other problems during the voltage transformation process. At the same time, since the windings in existing planar transformers are all connected in a fixed way, the applicable range of planar transformers is limited. Summary of the Invention

[0004] In view of the above problems, the present invention provides a transformer circuit structure and transformation method based on a multi-column transformer.

[0005] According to a first aspect of the present invention, a transformer circuit structure based on a multi-column transformer is provided, comprising: a full-bridge inverter module electrically connected to an input power supply, the full-bridge inverter module being used to invert the input voltage to obtain a high-frequency AC voltage; and a multi-column transformer electrically connected to the full-bridge inverter module, the multi-column transformer comprising N primary windings and M secondary windings, wherein the nth primary winding and the two secondary windings corresponding to the nth primary winding are wound together on the same magnetic column, and the N primary windings and M secondary windings are used together to transform the high-frequency AC voltage to obtain an intermediate AC voltage, wherein N≥4 and N is an integer multiple of 4, 1≤n≤N, M=2N; the synchronous rectification module is electrically connected to the multi-column transformer. The synchronous rectification module includes N parallel rectification and filtering sub-modules and an output sub-module electrically connected to the N rectification and filtering sub-modules. The input terminal of the nth rectification and filtering sub-module is electrically connected to the two secondary windings corresponding to the nth primary winding. The output terminal of the nth rectification and filtering sub-module is electrically connected to the output sub-module. The N rectification and filtering sub-modules are used to rectify the intermediate AC voltage to obtain the intermediate DC voltage. The output sub-module is used to filter the intermediate DC voltage to obtain and output the target voltage.

[0006] A second aspect of the present invention provides a voltage conversion method, comprising: sending an input voltage to a full-bridge inverter module; the full-bridge inverter module performing inversion processing on the input voltage to obtain and send a high-frequency AC voltage to a multi-column transformer; based on the turns ratio between the N primary windings and M secondary windings in the multi-column transformer, performing voltage transformation processing on the high-frequency AC voltage to obtain and send an intermediate AC voltage to a synchronous rectification module; and the N rectification and filtering sub-modules and the output sub-module within the synchronous rectification module performing rectification and filtering processing on the intermediate AC voltage to obtain and output a target voltage.

[0007] According to the transformer circuit structure and transformation method based on a multi-column transformer of the present invention, the transformer circuit structure based on the multi-column transformer includes a full-bridge inverter module, a multi-column transformer, and a synchronous rectification module. The input power supply provides an input voltage to the full-bridge inverter module. Through the alternating switching of multiple devices within the full-bridge inverter module, the input voltage is inverted to obtain and supply a high-frequency AC voltage to the multi-column transformer. The multi-column transformer may include multiple column structures, multiple primary windings in multiples of 4, and multiple secondary windings twice the number of primary windings. These windings can be wound on multiple columns of the multi-column transformer, with only two 1-turn secondary windings wound on each column. The multiple primary windings wound on the columns can form multiple current branches. The multiple primary windings can be connected in series, parallel, or a combination of series and parallel connections, allowing the current to be distributed across multiple winding paths. This reduces the current density in a single winding, decreases the equivalent resistance of the winding conductor in a high-frequency environment, and reduces winding copper losses. Meanwhile, by using different connection methods between multiple primary windings, the limitation that the transformer's transformation ratio is restricted by the fixed multiple relationship determined by the number of magnetic columns (for example, the transformation ratio of 4 magnetic columns can only be 4c:1, the transformation ratio of 8 magnetic columns can only be 8c:1, etc., where c is a positive integer) can be overcome when the number of turns in the secondary winding is a single turn. This allows multi-magnetic-column transformers to achieve any even multiple of transformation ratio configuration, broadening the applicability and reliability of multi-magnetic-column transformers under different input and output environments.

[0008] According to an embodiment of the present invention, multiple independent secondary windings connected in parallel are used to draw out and form multiple independent current channels. Combined with multiple rectifier and filter sub-modules in the synchronous rectifier module, multiple secondary winding branch circuits that can be independently rectified and filtered are constructed. By means of physical circuit construction, the current sharing effect of each branch is ensured, while the heat distribution of the circuit is improved, and the device damage caused by excessive local heat growth is avoided, thereby improving the reliability and robustness of the transformer circuit. Attached Figure Description

[0009] The above-mentioned contents, as well as other objects, features and advantages of the present invention, will become clearer from the following description of embodiments of the present invention with reference to the accompanying drawings.

[0010] Figure 1 A schematic diagram of a transformer circuit based on a multi-column transformer according to an embodiment of the present invention is shown.

[0011] Figure 2A A schematic diagram of a multi-column transformer according to an embodiment of the present invention is shown.

[0012] Figure 2B A schematic diagram of a multi-column transformer according to another embodiment of the present invention is shown.

[0013] Figure 3 A schematic diagram of an even-numbered layer circuit board with primary windings arranged according to an embodiment of the present invention is shown.

[0014] Figure 4 A schematic diagram of an odd-layer circuit board with primary windings arranged according to an embodiment of the present invention is shown.

[0015] Figure 5 A schematic diagram of an even-numbered circuit board with primary windings and six magnetic pillars, according to an embodiment of the present invention, is shown.

[0016] Figure 6 A schematic diagram of a two-layer circuit board with secondary windings arranged according to an embodiment of the present invention is shown.

[0017] Figure 7A A top view of the core structure of a multi-pillar transformer according to an embodiment of the present invention is shown.

[0018] Figure 7B A structural side view of the core structure of a multi-pillar transformer according to an embodiment of the present invention is shown.

[0019] Figure 7C A schematic diagram showing the magnetic flux directions of a plurality of primary windings according to an embodiment of the present invention is provided.

[0020] Figure 8 A schematic diagram of the structure of the synchronous rectification module and the full-bridge inverter module according to an embodiment of the present invention is shown.

[0021] Figure 9 A flowchart of a voltage conversion method according to an embodiment of the present invention is shown. Detailed Implementation

[0022] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the embodiments of the invention for ease of explanation. However, it will be apparent that one or more embodiments may be practiced without these specific details. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0023] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The terms “comprising,” “including,” etc., as used herein indicate the presence of the stated features, steps, operations, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, or components.

[0024] All terms used herein (including technical and scientific terms) have the meanings commonly understood by those skilled in the art, unless otherwise defined. It should be noted that the terms used herein are to be interpreted in a manner consistent with the context of this specification, and not in an idealized or overly rigid way.

[0025] When using expressions such as "at least one of A, B and C", they should generally be interpreted in accordance with the meaning that is commonly understood by those skilled in the art (e.g., "a system having at least one of A, B and C" should include, but is not limited to, a system having A alone, a system having B alone, a system having C alone, a system having A and B, a system having A and C, a system having B and C, and / or a system having A, B and C, etc.).

[0026] In the technical solution of this invention, the user information (including but not limited to user personal information, user image information, user device information, such as location information) and data (including but not limited to data used for analysis, stored data, and displayed data) involved are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, storage, use, processing, transmission, provision, invention, and application of related data all comply with relevant laws, regulations, and standards, take necessary confidentiality measures, do not violate public order and good morals, and provide corresponding operation entry points for users to choose to authorize or refuse.

[0027] As power electronics technology advances towards higher frequencies, higher efficiency, and higher power density, magnetic components are gradually evolving from traditional wire-wound structures to planar structures. Planar transformers are typically in the form of printed circuit boards or copper foil windings. Due to their advantages such as compact structure, good heat dissipation, and ease of automated manufacturing, planar transformers are widely used in high-power-density applications such as communication power supplies, server power supplies, data center power modules, and electric vehicle power systems.

[0028] The internal core structure of existing planar transformers is typically based on E-type or U-type core structures. E-type or U-type core structures usually concentrate the primary and secondary windings within a single magnetic column. In existing planar transformers, the windings can be distributed in multiple layers within the core window, and the required number of turns is obtained through interlayer connections on the circuit board. This existing planar transformer exhibits good repeatability under high-frequency conditions. However, due to the thinness of the planar transformer and the high current density, and the fact that the current is mainly concentrated in a local path, the skin effect and proximity effect within the windings are more pronounced in high-current applications. This increases the AC resistance within the circuit, resulting in significant winding copper losses and conductor losses, limiting the transformer efficiency and increasing the design complexity of the transformer.

[0029] Furthermore, the voltage transformation ratio of a transformer typically relies on adjusting the turns ratio between the windings to achieve voltage transformation. However, in high-frequency applications, the longer winding length resulting from a larger number of winding turns can exacerbate the skin effect and proximity effect within the circuit.

[0030] To reduce rectification losses on the secondary winding side, multiple synchronous rectifiers can be used instead of traditional diode rectifiers in E-type and U-type planar transformer structures. However, because the output paths on the secondary winding side are relatively concentrated, the parasitic parameters between different branches differ, which can easily lead to uneven current distribution.

[0031] Based on this, multi-column transformer structures, such as four-column planar transformers, can be adopted, paired with synchronous rectifiers to improve current distribution. However, because the connection method of each column winding in a multi-column transformer is relatively fixed, the equivalent number of turns in a four-column planar transformer is often an integer multiple of 4, which limits the adjustment of the turns ratio and makes it difficult to meet the requirements of high-ratio and high-efficiency applications. During the research, it was found that in high-frequency, high-current applications, existing planar transformers have significant winding copper losses, and the current distribution output through the related circuits on the secondary winding side is uneven. This leads to problems such as localized overheating in the topology circuit during voltage transformation. Furthermore, the fixed connection method of each winding in existing planar transformers limits their applicability.

[0032] In view of this, embodiments of the present invention provide a transformer circuit structure based on a multi-column transformer, comprising: a full-bridge inverter module electrically connected to the input power supply, the full-bridge inverter module being used to invert the input voltage to obtain a high-frequency AC voltage; and a multi-column transformer electrically connected to the full-bridge inverter module, the multi-column transformer comprising N primary windings and M secondary windings, wherein the nth primary winding and the two secondary windings corresponding to the nth primary winding are wound together on the same magnetic column, and the N primary windings and M secondary windings are used together to transform the high-frequency AC voltage to obtain an intermediate AC voltage, where N≥4 and N is an integer multiple of 4, 1≤n≤N, M=2N; the synchronous rectification module is electrically connected to the multi-column transformer. The synchronous rectification module includes N parallel rectification and filtering sub-modules and an output sub-module electrically connected to the N rectification and filtering sub-modules. The input terminal of the nth rectification and filtering sub-module is electrically connected to the two secondary windings corresponding to the nth primary winding. The output terminal of the nth rectification and filtering sub-module is electrically connected to the output sub-module. The N rectification and filtering sub-modules are used to rectify the intermediate AC voltage to obtain the intermediate DC voltage. The output sub-module is used to filter the intermediate DC voltage to obtain and output the target voltage.

[0033] Figure 1 A schematic diagram of a transformer circuit based on a multi-column transformer according to an embodiment of the present invention is shown.

[0034] like Figure 1 As shown, the transformer circuit structure based on the multi-column transformer 102 in this embodiment may include a full-bridge inverter module 101, a multi-column transformer 102, and a synchronous rectification module 103. Figure 1 The diagram shows multiple primary windings 104 with N>4, multiple secondary windings 105 corresponding to the multiple primary windings 104, and multiple rectifier and filter submodules 106.

[0035] Specifically, the full-bridge inverter module 101 can be electrically connected to the input power supply. The full-bridge inverter module 101 is used to invert the input voltage Vin to obtain a high-frequency AC voltage.

[0036] The multi-column transformer 102 can be electrically connected to the full-bridge inverter module 101. The multi-column transformer 102 can include N primary windings 104 and M secondary windings 105. The nth primary winding and the two secondary windings corresponding to the nth primary winding are wound on the same magnetic column. The N primary windings 104 and M secondary windings 105 are used together to transform the high-frequency AC voltage to obtain an intermediate AC voltage. N≥4 and N is an integer multiple of 4, 1≤n≤N, and M=2N.

[0037] The multi-column transformer 102 can be characterized as a transformer comprising multiple column structures. The two secondary windings corresponding to the nth primary winding can be wound on both sides of the nth primary winding, so that the nth primary winding and the two secondary windings are arranged in a multi-layered superposition on the column.

[0038] The multiple primary windings 104 within the multi-column transformer 102 can be connected in series, parallel, or a combination of series and parallel connections, depending on the number of circuit boards. This allows current to be distributed in the conductive paths associated with the multiple primary windings 104, reducing the current density in each conductive path. Furthermore, through various connection methods, different winding turns between the primary and secondary windings can be equivalent to different transformation ratios, enabling the multi-column transformer 102 to achieve any even multiple of transformation ratios.

[0039] Based on the target transformation requirements, the current transformation ratio of the multi-column transformer 102 can be determined. Based on this transformation ratio, the number of turns between the primary and secondary windings can be adjusted to transform the high-frequency AC voltage. Specifically, the number of turns in the primary and secondary windings on each column is the same. Each column can have multiple turns of primary winding, and each secondary winding can have only one turn. For example, the transformation ratio between the nth primary winding and the two corresponding secondary windings can be 5:1:1.

[0040] The synchronous rectification module 103 can be electrically connected to the multi-column transformer 102. The synchronous rectification module 103 can include N parallel rectification and filtering sub-modules 106 and an output sub-module 107 electrically connected to the N rectification and filtering sub-modules 106. The input terminal of the nth rectification and filtering sub-module is electrically connected to the two secondary windings corresponding to the nth primary winding. The output terminal of the nth rectification and filtering sub-module is electrically connected to the output sub-module 107. The N rectification and filtering sub-modules 106 are used to rectify the intermediate AC voltage to obtain the intermediate DC voltage. The output sub-module 107 is used to filter the intermediate DC voltage to obtain and output the target voltage.

[0041] Multiple rectifier devices within the parallel-connected rectifier and filter submodules 106 enable different secondary winding branches to operate in parallel. Responding to the polarity state of the multiple secondary windings 105, the charging and discharging states of the multiple rectifier and filter submodules 106 are controlled. The current after transformation transmitted through different secondary windings is subjected to multi-channel independent transmission and rectification and filtering processing, so that the current distribution in the circuit on the secondary winding side is in a current-equal state. At the same time, the circuits of the multiple secondary windings 105 and the synchronous rectifier module 103 electrically connected to the multiple secondary windings 105 can present an approximately symmetrical structure, further reducing AC losses.

[0042] By controlling the full-bridge inverter module 101 to change the current direction flowing through the multiple series-parallel connected primary windings of the multi-column transformer 102, the magnetic flux direction of the multiple primary windings 104 is reversed. Based on the principle of electromagnetic induction, the polarity state of the multiple secondary windings 105 and the charging and discharging state of the multiple rectifier and filter submodules 106 are changed, thereby enabling the intermediate AC voltage to be rectified through multiple independent channels to obtain and output the target voltage and target current.

[0043] According to an embodiment of the present invention, the transformer circuit structure based on a multi-column transformer includes a full-bridge inverter module, a multi-column transformer, and a synchronous rectification module. The input power supply provides an input voltage to the full-bridge inverter module. Through the alternating switching of multiple devices within the full-bridge inverter module, the input voltage is inverted to obtain and supply a high-frequency AC voltage to the multi-column transformer. The multi-column transformer may include multiple column structures, multiple primary windings in multiples of 4, and multiple secondary windings twice the number of primary windings. These windings can be wound on multiple columns of the multi-column transformer, with only two 1-turn secondary windings wound on each column. The multiple primary windings wound on the columns can form multiple current branches. These primary windings can be connected in series, parallel, or a combination of series and parallel connections, allowing current to be distributed across multiple winding paths. This reduces the current density in a single winding, decreases the equivalent resistance of the winding conductor in a high-frequency environment, and reduces winding copper losses. Meanwhile, by using different connection methods between multiple primary windings, the limitation that the transformer's transformation ratio is restricted by the fixed multiple relationship determined by the number of magnetic columns (for example, the transformation ratio of 4 magnetic columns can only be 4c:1, the transformation ratio of 8 magnetic columns can only be 8c:1, etc., where c is a positive integer) can be overcome when the number of turns in the secondary winding is a single turn. This allows multi-magnetic-column transformers to achieve any even multiple of transformation ratio configuration, broadening the applicability and reliability of multi-magnetic-column transformers under different input and output environments.

[0044] According to an embodiment of the present invention, multiple independent secondary windings connected in parallel are used to draw out and form multiple independent current channels. Combined with multiple rectifier and filter sub-modules in the synchronous rectifier module, multiple secondary winding branch circuits that can be independently rectified and filtered are constructed. By means of physical circuit construction, the current sharing effect of each branch is ensured, while the heat distribution of the circuit is improved, and the device damage caused by excessive local heat growth is avoided, thereby improving the reliability and robustness of the transformer circuit.

[0045] Figure 2A A schematic diagram of a multi-column transformer according to an embodiment of the present invention is shown.

[0046] like Figure 2AAs shown, the multi-column transformer 102 may include four primary windings 104, i.e., when N=4. The same-name terminal of the first primary winding N1 is electrically connected to the same-name terminal of the third primary winding N3, and the opposite-name terminal of the first primary winding N1 is electrically connected to the same-name terminal of the second primary winding N2; the opposite-name terminal of the second primary winding N2 is electrically connected to the opposite-name terminal of the fourth primary winding N4; the opposite-name terminal of the third primary winding N3 is electrically connected to the same-name terminal of the fourth primary winding N4; the same-name terminal of the m-th secondary winding is electrically connected to the first input terminal of the n-th rectifier-filter submodule corresponding to the m-th and m+1-th secondary windings, and the opposite-name terminal of the m-th secondary winding is electrically connected to the same-name terminal of the m+1-th secondary winding; the opposite-name terminal of the m+1-th secondary winding is electrically connected to the second input terminal of the n-th rectifier-filter submodule, where 1≤m<M.

[0047] That is, in the case where the multi-column transformer 102 includes four primary windings, the first primary winding N1 and the second primary winding N2 are connected in series, the third primary winding N3 and the fourth primary winding N4 are connected in series, and the first primary winding N1 and the second primary winding N2 are connected in parallel with the third primary winding N3 and the fourth primary winding N4. The first primary winding N1 corresponds to the first secondary winding M1 and the second secondary winding M2, the second primary winding N2 corresponds to the third secondary winding M3 and the fourth secondary winding M4, the third primary winding N3 corresponds to the fifth secondary winding M5 and the sixth secondary winding M6, and the fourth primary winding N4 corresponds to the seventh secondary winding M7 and the eighth secondary winding M8.

[0048] Figure 2B A schematic diagram of a multi-column transformer according to another embodiment of the present invention is shown.

[0049] like Figure 2B As shown, the multi-column transformer 102 can include more than 4 primary windings, i.e., when N=4P. Four primary windings can be regarded as one primary winding unit (or can be regarded as one multi-column transformer). Based on the connection method of multiple primary windings with N=4, the circuit connection is first made inside each primary winding unit, and then multiple primary winding units are connected in parallel (or can be regarded as multiple multi-column transformers are connected in parallel). P is a positive integer greater than 1, 1≤p<P.

[0050] The same-name terminal of the first primary winding in the p-th primary winding unit is electrically connected to the same-name terminal of the third primary winding in the p-th primary winding unit and the same-name terminal of the first primary winding in the (p+1)-th primary winding unit. The opposite-name terminal of the first primary winding in the p-th primary winding unit is electrically connected to the same-name terminal of the second primary winding in the p-th primary winding unit. The opposite-name terminal of the second primary winding in the p-th primary winding unit is electrically connected to the opposite-name terminal of the fourth primary winding in the p-th primary winding unit. The opposite-name terminal of the third primary winding in the p-th primary winding unit... The same-name terminal of the fourth primary winding in the p-th primary winding unit is electrically connected; the opposite-name terminal of the fourth primary winding in the p-th primary winding unit is electrically connected to the opposite-name terminal of the fourth primary winding in the (p+1)-th primary winding unit; the same-name terminal of the m-th secondary winding is electrically connected to the first input terminal of the n-th rectifier-filter submodule corresponding to the m-th and (m+1)-th secondary windings; the opposite-name terminal of the m-th secondary winding is electrically connected to the same-name terminal of the (m+1)-th secondary winding; the opposite-name terminal of the (m+1)-th secondary winding is electrically connected to the second input terminal of the n-th rectifier-filter submodule.

[0051] like Figure 2B As shown, the same-name terminal of the first primary winding N1' in the first primary winding unit 201 is electrically connected to the same-name terminal of the third primary winding N3' in the first primary winding unit 201 and the same-name terminal of the first primary winding N1'' in the second primary winding unit 202. The opposite-name terminal of the first primary winding N1' in the first primary winding unit 201 is electrically connected to the same-name terminal of the second primary winding N2' in the first primary winding unit 201. The opposite-named terminal of the second primary winding N2' is electrically connected to the opposite-named terminal of the fourth primary winding N4' in the first primary winding unit 201; the opposite-named terminal of the third primary winding N3' in the first primary winding unit 201 is electrically connected to the same-named terminal of the fourth primary winding N4' in the first primary winding unit 201; the opposite-named terminal of the fourth primary winding N4' in the first primary winding unit 201 is electrically connected to the opposite-named terminal of the fourth primary winding N4'' in the second primary winding unit 202.

[0052] The same-name terminal of the first primary winding N1'' in the second primary winding unit 202 is electrically connected to the same-name terminal of the third primary winding N3'' in the second primary winding unit 202 and the same-name terminal of the first primary winding N1' in the first primary winding unit 201. The opposite-name terminal of the first primary winding N1'' in the second primary winding unit 202 is electrically connected to the same-name terminal of the second primary winding N2'' in the second primary winding unit 202. The opposite-named terminal of the first primary winding N2'' is electrically connected to the opposite-named terminal of the fourth primary winding N4'' in the second primary winding unit 202; the opposite-named terminal of the third primary winding N3'' in the second primary winding unit 202 is electrically connected to the same-named terminal of the fourth primary winding N4'' in the second primary winding unit 202; the opposite-named terminal of the fourth primary winding N4'' in the second primary winding unit 202 is electrically connected to the opposite-named terminal of the fourth primary winding N4'' in the first primary winding unit 201.

[0053] Taking P=2, i.e. N=8, as an example, the first primary winding N1' and the second primary winding N2' in the first primary winding unit 201 are connected in series, the third primary winding N3' and the fourth primary winding N4' in the first primary winding unit 201 are connected in series, and the first primary winding N1' and the second primary winding N2' in the first primary winding unit 201 are connected in parallel with the third primary winding N3' and the fourth primary winding N4' in the first primary winding unit 201.

[0054] The first primary winding N1'' and the second primary winding N2'' in the second primary winding unit 202 are connected in series. The third primary winding N3'' and the fourth primary winding N4'' in the second primary winding unit 202 are connected in series. The first primary winding N1'' and the second primary winding N2'' in the second primary winding unit 202 are connected in parallel with the third primary winding N3'' and the fourth primary winding N4'' in the second primary winding unit 202.

[0055] The first primary winding unit 201 and the second primary winding unit 202 are connected in parallel.

[0056] The first primary winding N1' in the first primary winding unit 201 corresponds to the first secondary winding M1 and the second secondary winding M2. The second primary winding N2' in the first primary winding unit 201 corresponds to the third secondary winding M3 and the fourth secondary winding M4. The third primary winding N3' in the first primary winding unit 201 corresponds to the fifth secondary winding M5 and the sixth secondary winding M6. The fourth primary winding N4' in the first primary winding unit 201 corresponds to the seventh secondary winding M7 and the eighth secondary winding M8.

[0057] The first primary winding N1'' in the second primary winding unit 202 corresponds to the ninth secondary winding M9 and the tenth secondary winding M10. The second primary winding N2'' in the second primary winding unit 202 corresponds to the eleventh secondary winding M11 and the twelfth secondary winding M12. The third primary winding N3'' in the second primary winding unit 202 corresponds to the thirteenth secondary winding M13 and the fourteenth secondary winding M14. The fourth primary winding N4'' in the second primary winding unit 202 corresponds to the fifteenth secondary winding M15 and the sixteenth secondary winding M16.

[0058] According to embodiments of the present invention, for the winding structure within a multi-column transformer, four primary windings can be used as the dividing lines for circuit connections. Each group of four primary windings is connected using the same series-parallel combination connection method. When there are more than four primary windings, four primary windings are considered as one primary winding unit, and multiple primary winding units with pre-connected internal circuits are connected in parallel. This achieves circuit connection through a series-parallel combination connection method between multiple primary windings, allowing current to be distributed across multiple winding paths. This reduces the current density in a single winding, decreases the equivalent resistance of the winding conductor in high-frequency environments, and thus reduces winding copper losses. Simultaneously, by using different connection methods between multiple primary windings, the multi-column transformer can achieve any even multiple of the turns ratio, broadening its applicability and reliability under different input / output environments.

[0059] Figure 3 A schematic diagram of an even-numbered layer circuit board with primary windings arranged according to an embodiment of the present invention is shown.

[0060] like Figure 3 As shown, when N primary windings are distributed on an even number of circuit board layers and the number of magnetic pillars is N, with the central axis of the circuit board extending along the first direction as the axis of symmetry, the conductive paths within the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulation gaps within the circuit board ( Figure 3The white lines in the diagram are symmetrically distributed on both sides of the central axis along the first direction. That is, taking an even-numbered circuit board as an example with two circuit boards, N=4 and including 4 magnetic pillars, the two magnetic pillars located at the top (the first magnetic pillar and the second magnetic pillar) and the two magnetic pillars located at the bottom (the third magnetic pillar and the fourth magnetic pillar) in each circuit board can be completely symmetrical in terms of winding arrangement.

[0061] Furthermore, taking an even-numbered circuit board as an example with two layers, N=4, and including 4 magnetic pillars, the average shunt high-frequency AC current I corresponding to the high-frequency AC voltage is... p / 2, via the first conductive path laid within the first layer of the circuit board ( Figure 3 The first layer of the circuit board containing the primary winding has a dark blue line and a first via. Figure 3 The yellow circle pointed to by the dark blue line in the first layer circuit board with the primary winding is the first conductive path flowing into the second layer circuit board. Figure 3 The dark blue line in the second layer circuit board containing the primary winding is then routed through the second via in the second layer circuit board. Figure 3 The yellow circle pointed to by the dark blue line in the second-layer circuit board with the primary winding flows into the second conductive path in the first-layer circuit board. Figure 3 The light blue line in the first layer of the circuit board where the primary winding is arranged.

[0062] Meanwhile, via the third conductive path laid within the first layer of the circuit board ( Figure 3 The first layer of the circuit board containing the primary winding has a dark green line) and a third via ( Figure 3 The yellow circle pointed to by the dark green line in the first-layer circuit board with the primary winding flows into the second conductive path in the second-layer circuit board. Figure 3 The dark green line in the second-layer circuit board containing the primary winding is then routed through the fourth via in the second-layer circuit board. Figure 3 The yellow circle pointed to by the dark green line in the second-layer circuit board with the primary winding flows into the fourth conductive path in the first-layer circuit board. Figure 3 The light green line in the first layer of the circuit board with the primary winding is arranged in the middle.

[0063] Through the two complete conductive paths located within the two-layer circuit board for transmitting the averaged shunted high-frequency alternating current, the first primary winding is connected in series with the second primary winding, the third primary winding is connected in series with the fourth primary winding, and the first primary winding is connected in parallel with the second primary winding and the third primary winding is connected in parallel with the fourth primary winding.

[0064] The current input terminal and the current output terminal are both located on the same side of the first layer circuit board where the primary winding is located, so that the high-frequency AC current can flow out along the current output terminal which is located on the same side as the current input terminal.

[0065] In this circuit board, different conductive paths located within the same layer can be isolated by insulating gaps. The first conductive path within the first layer is formed by winding a first primary winding along two magnetic pillars parallel to the central axis. The first conductive path within the second layer is formed by winding a second primary winding along two magnetic pillars parallel to the central axis. The third conductive path within the first layer is formed by winding a third primary winding along two other magnetic pillars parallel to the central axis. The second conductive path within the second layer is formed by winding a fourth primary winding along two other magnetic pillars parallel to the central axis. Simultaneously, the central axis extending along the first direction can be characterized as the winding of the first magnetic pillar (e.g., ...) Figure 3 The gray magnetic pillar located in the upper left corner of each circuit board shown) and the third magnetic pillar (as shown) Figure 3 The gray magnetic pillars in the lower left corner of each layer of the circuit board shown are connected by a line perpendicular to the orthographic projection of the line onto the surface of the circuit board.

[0066] By sequentially winding the primary winding along the magnetic post window in each layer of the circuit board, and passing around two magnetic posts in sequence within that layer, a continuous conductive path is formed between the two magnetic posts for the same primary winding. This path is then electrically connected to the conductive paths in adjacent circuit boards via vias, thus achieving a series structure for multi-layer windings. When the number of circuit board layers with primary windings is even, since each primary winding can achieve a connection transition from one magnetic post to the other, after an even number of layers are stacked, the starting and ending ends of the entire winding (the first and second primary windings) can return to the same side, thereby forming a closed loop.

[0067] Simultaneously, the conductive paths corresponding to the two upper magnetic pillars (the first and second magnetic pillars) and the conductive paths corresponding to the two lower magnetic pillars (the third and fourth magnetic pillars) are connected at their starting ends and at their ending ends, thus forming a parallel connection structure. Through this parallel connection between the primary windings, the windings on the corresponding magnetic pillars can participate in current conduction together, allowing for a more even distribution of current among the multiple winding paths.

[0068] According to embodiments of the present invention, when the primary windings are distributed on an even number of circuit board layers, the transmission path of the high-frequency alternating current can be divided into two paths based on different primary windings and magnetic posts, thereby achieving parallel connection between multiple primary windings. Then, utilizing the conductive path formed by the primary windings sequentially passing around two magnetic posts within a single circuit board layer, and combining this with vias positioned between two circuit boards, the conductive paths at the same magnetic post positions within the two circuit boards are electrically connected, thereby achieving series connection between multiple primary windings. This allows the windings on corresponding magnetic posts to participate in current conduction, enabling a more even distribution of current among multiple winding paths while placing the current input and output terminals on the same side. This reduces the need for additional return paths and allows the multi-magnetic-post transformer to achieve any even multiple turns ratio configuration.

[0069] Figure 4 A schematic diagram of an odd-layer circuit board with primary windings arranged according to an embodiment of the present invention is shown.

[0070] like Figure 4 As shown, when N primary windings are distributed on an odd number of layers of a circuit board and the number of magnetic pillars is N, with the central axis of the circuit board extending along the first direction as the axis of symmetry, the conductive paths within the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulation gaps within the circuit board ( Figure 4 The white lines in the diagram are distributed symmetrically on both sides of the central axis along the first direction. That is, taking an odd-numbered circuit board as a three-layer circuit board with N=4 and including 4 magnetic pillars as an example, the two magnetic pillars located at the top (the first magnetic pillar and the second magnetic pillar) and the two magnetic pillars located at the bottom (the third magnetic pillar and the fourth magnetic pillar) in each circuit board can be in a completely symmetrical relationship in terms of winding arrangement.

[0071] In the case where the odd-numbered layer circuit board is a three-layer circuit board with N=4 and includes 4 magnetic pillars, the average shunt high-frequency AC current I corresponding to the high-frequency AC voltage is... p / 2, via the first conductive path laid within the first layer of the circuit board ( Figure 4 The first layer of the circuit board containing the primary winding (red line) and the first via ( Figure 4 The first conductive path (pointed to by the yellow circle in the red line of the first circuit board with the primary winding) flows into the second circuit board. Figure 4 The red wire in the second-layer circuit board with the primary winding is arranged in the middle, and passes through the second via in the second-layer circuit board ( Figure 4 The first conductive path (pointed to by the yellow circle in the red line of the second-layer circuit board with the primary winding) flows into the third-layer circuit board. Figure 4 The red wire in the third layer circuit board with the primary winding is arranged in the middle, and passes through the third via in the third layer circuit board ( Figure 4The yellow circle pointed to by the red line in the third-layer circuit board with the primary winding in the middle flows into the second conductive path in the second-layer circuit board. Figure 4 The pink wire in the second-layer circuit board with the primary winding is arranged in the middle, and passes through the fourth via in the second-layer circuit board ( Figure 4 The yellow circle pointed to by the pink wire in the second circuit board with the primary winding in the middle flows into the second conductive path in the first circuit board. Figure 4 The brown wires in the first layer of the circuit board with the primary winding are arranged in the middle.

[0072] Meanwhile, via the third conductive path laid within the first layer of the circuit board ( Figure 4 The purple wire in the first layer of the circuit board containing the primary winding) and the fifth via ( Figure 4 The yellow circle pointed to by the purple line in the first-layer circuit board with the primary winding flows into the third conductive path in the second-layer circuit board. Figure 4 The purple wire in the second-layer circuit board with the primary winding is arranged in the middle, and passes through the sixth via in the second-layer circuit board ( Figure 4 The yellow circle pointed to by the purple line in the second-layer circuit board with the primary winding in the middle flows into the second conductive path in the third-layer circuit board. Figure 4 The purple wire in the third layer circuit board with the primary winding is arranged in the middle, and passes through the seventh via in the third layer circuit board ( Figure 4 The yellow circle pointed to by the purple line in the third-layer circuit board with the primary winding flows into the fourth conductive path in the second-layer circuit board. Figure 4 The light purple line in the second-layer circuit board with the primary winding is arranged in the middle, and passes through the eighth via in the second-layer circuit board ( Figure 4 The yellow circle pointed to by the light purple line in the second-layer circuit board with the primary winding flows into the fourth conductive path in the first-layer circuit board. Figure 4 The dark blue wire is arranged in the first layer of the circuit board with the primary winding.

[0073] Through the two complete conductive paths located within the three-layer circuit board for transmitting the averaged shunted high-frequency alternating current, the first primary winding is connected in series with the second primary winding, the third primary winding is connected in series with the fourth primary winding, and the first primary winding is connected in parallel with the second primary winding and the third primary winding is connected in parallel with the fourth primary winding.

[0074] In order to ensure that both the current input terminal and the current output terminal are located on the same side of the first circuit board where the primary winding is located, so that the high-frequency AC current can flow out along the current output terminal located on the same side as the current input terminal, for odd-numbered circuit boards, additional return channels can be set in addition to the conductive path corresponding to the primary winding (such as the first conductive path in the third circuit board and the second conductive path in the second circuit board, as well as the second conductive path in the third circuit board and the fourth conductive path in the second circuit board), so that the current output terminal returns to the same side as the current input terminal, thereby forming a complete closed loop. At the same time, the current output terminal can also return to the same side as the current input terminal by means of lead wire connection.

[0075] In this circuit board, different conductive paths located within the same layer are isolated by insulating gaps. The first conductive path within the first layer is formed by winding a first primary winding along two magnetic pillars parallel to the central axis. The first conductive path within the second layer is formed by winding a second primary winding along two magnetic pillars parallel to the central axis. The third conductive path within the first layer is formed by winding a third primary winding along two additional magnetic pillars parallel to the central axis. The third conductive path within the second layer is formed by winding a fourth primary winding along two additional magnetic pillars parallel to the central axis. Simultaneously, the central axis extending along the first direction can be characterized as the winding of the first magnetic pillar (e.g., ...) Figure 4 The gray magnetic pillar located in the upper left corner of each circuit board shown) and the third magnetic pillar (as shown) Figure 4 The gray magnetic pillars in the lower left corner of each layer of the circuit board shown are connected by a line perpendicular to the orthographic projection of the line onto the surface of the circuit board.

[0076] When the number of layers of the circuit board with the primary winding is odd, the starting ends of the conductive paths corresponding to the two upper magnetic pillars (the first and second magnetic pillars) and the conductive paths corresponding to the two lower magnetic pillars (the third and fourth magnetic pillars) are connected to each other, and the ending ends are also connected to each other, so as to form a parallel connection structure to ensure the electrical equivalence between the winding branches.

[0077] By using the above winding connection method, multiple primary windings can be continuously connected under different layer conditions, and a series-parallel combination structure can be formed between multiple magnetic columns to change the transformer's transformation ratio.

[0078] According to embodiments of the present invention, when the primary windings are distributed on an odd-numbered layer circuit board, the transmission path of the high-frequency alternating current can be divided into two paths based on different primary windings and magnetic pillars to achieve parallel connection between multiple primary windings. Then, utilizing the conductive path formed by the primary windings sequentially passing around two magnetic pillars within a single circuit board layer, and combining this with vias positioned between the two circuit boards, the conductive paths at the same magnetic pillar positions within the two circuit boards are electrically connected to achieve series connection between multiple primary windings. However, for an odd-numbered layer circuit board, additional return paths are required to ensure a more even distribution of current among the multiple winding paths, while allowing the current input and output terminals to be located on the same side. This reduces the need for additional return paths and enables the multi-magnetic-pillar transformer 102 to achieve any even-numbered turns ratio configuration.

[0079] Regarding the number of circuit board layers distributed on the primary winding, when only one turn of the primary winding is formed in each circuit board layer, the number of circuit board layers can be the same as the number of turns of the primary winding on each magnetic post. Thus, when the number of turns of the primary winding is odd, an odd number of circuit board layers can be used, and when the number of turns of the primary winding is even, an even number of circuit board layers can be used.

[0080] When multiple turns of primary winding can be formed in each layer of the circuit board, the number of circuit board layers and the number of turns of the primary winding no longer need to correspond one-to-one. It is only necessary to ensure that the total number of turns of the primary winding in the multi-layer circuit board reaches half of the preset transformer transformation ratio and can achieve the predetermined series, parallel, or series-parallel connection relationship. That is, whether to use an odd or even number of circuit board layers in the transformer can be flexibly determined based on actual engineering conditions such as wiring space, voltage level, cost, and heat dissipation, and there are no specific limitations on this.

[0081] Figure 5 A schematic diagram of an even-numbered circuit board with primary windings and six magnetic pillars, according to an embodiment of the present invention, is shown.

[0082] like Figure 5 As shown, further, in addition to the four-pillar structure described above, it can also include a six-pillar matrix transformer formed by arranging multiple EI-type magnetic core units in a straight line along the same direction. Taking an example where four primary windings are distributed on two layers of a circuit board and the number of magnetic pillars is six, the central axis extending along the first direction of the circuit board is the axis of symmetry. The conductive paths within the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulating gaps within the circuit board are symmetrically distributed on both sides of the central axis along the first direction. Simultaneously, the central axis extending along the first direction can be characterized as the first magnetic pillar (e.g., ...) Figure 5 The first gray magnetic pillar located to the left of the central axis in each layer of the circuit board shown) and the third magnetic pillar (as shown) Figure 5The first gray magnetic column (located to the right of the central axis) in each layer of the circuit board shown is connected to the two points closest to each other by a line perpendicular to the orthographic projection of the line onto the surface of the circuit board.

[0083] When the even-numbered circuit board consists of two circuit boards, N=4, and the number of magnetic pillars is six, the high-frequency AC current corresponding to the high-frequency AC voltage flows through the first conductive path arranged in the first circuit board. Figure 5 The first layer of the circuit board containing the primary winding has a powder wire and a first via. Figure 5 The first conductive path (pointed to by the yellow circle in the pink wire of the first circuit board with the primary winding) flows into the second circuit board. Figure 5 The powder wire in the second layer circuit board with the primary winding is arranged in the middle, and then passes through the second via in the second layer circuit board ( Figure 5 The yellow circle pointed to by the pink wire in the second circuit board with the primary winding in the middle flows into the second conductive path in the first circuit board. Figure 5 The light purple wire in the first layer of the circuit board with the primary winding is arranged in the middle.

[0084] Meanwhile, via the third conductive path laid within the first layer of the circuit board ( Figure 5 The black wires in the first layer of the circuit board containing the primary winding) and the third via ( Figure 5 The yellow circle pointed to by the black line in the first-layer circuit board with the primary winding is the second conductive path that flows into the second-layer circuit board. Figure 5 The black wire in the second-layer circuit board containing the primary winding is then routed through the fourth via in the second-layer circuit board. Figure 5 The yellow circle pointed to by the black line in the second-layer circuit board with the primary winding flows into the fourth conductive path in the first-layer circuit board. Figure 5 The dark green line in the first layer of the circuit board with the primary winding is arranged in the middle.

[0085] In this circuit, the first conductive path within the first layer of the circuit board is formed by winding the first primary winding along the first and second magnetic pillars parallel to the central axis; the first conductive path within the second layer of the circuit board is formed by winding the second primary winding along the first and second magnetic pillars parallel to the central axis; the third conductive path within the first layer of the circuit board is formed by winding the third primary winding along the third and fourth magnetic pillars parallel to the central axis; the second conductive path within the second layer of the circuit board is formed by winding the fourth primary winding along the third and fourth magnetic pillars parallel to the central axis; and the fifth and sixth magnetic pillars are located on both sides of the even-numbered layers of the circuit board to suppress the magnetic flux of the yoke in the multi-pillar transformer.

[0086] That is, a six-pillar matrix transformer can include four magnetic pillars with primary windings in the middle and two magnetic pillars on both sides. The fifth and sixth magnetic pillars can also be called side pillars. The fifth magnetic pillar (the magnetic pillar on the left side of each circuit board in the figure) can be set outside the second magnetic pillar, and the sixth magnetic pillar (the magnetic pillar on the right side of each circuit board in the figure) can be set outside the fourth magnetic pillar. Multiple magnetic pillars can form a closed path of main magnetic flux through magnetic yokes, thus forming a magnetic component structure in the form of a matrix transformer.

[0087] Therefore, it is evident that the core of multi-column transformers achieving arbitrary even-number turns ratio configurations lies not in the requirement that the transformer core structure must adopt a four-column structure, but in the use of a hybrid series-parallel connection for the primary windings. That is, as long as the transformer core structure has multiple columns or magnetic units that can accommodate primary windings, and the primary windings can be connected in a hybrid series-parallel configuration according to their corresponding polarity, arbitrary even-number turns ratio configurations can be achieved.

[0088] According to embodiments of the present invention, for the core structure inside a multi-core transformer, a six-core matrix transformer can also be formed by arranging multiple EI-type core units in a straight line in the same direction. While ensuring that multiple primary windings are connected in series and parallel, the transformation ratio of transformers with various core types can be configured to be any even multiple.

[0089] Figure 6 A schematic diagram of a two-layer circuit board with secondary windings arranged according to an embodiment of the present invention is shown.

[0090] like Figure 6 As shown, the synchronous rectification module may include N first synchronous rectifiers, N second synchronous rectifiers, and 2N capacitors. Multiple secondary windings can be wound on multiple magnetic pillars, and the output terminal of each secondary winding is led out to form multiple relatively independent current channels.

[0091] In the first layer of the circuit board where the secondary windings are arranged, one end of the current channel corresponding to the first secondary winding is electrically connected to the source of the first first synchronous rectifier SR1, and the drain of the first first synchronous rectifier SR1 is electrically connected to the negative terminal of capacitor C. The other end of the current channel corresponding to the first secondary winding is electrically connected to the positive terminal of capacitor C. One end of the current channel corresponding to the third secondary winding is electrically connected to the source of the second first synchronous rectifier SR3, and the drain of the second first synchronous rectifier SR3 is electrically connected to the negative terminal of capacitor C. The other end of the current channel corresponding to the third secondary winding is electrically connected to the source of the second first synchronous rectifier SR3. The positive terminal of capacitor C is electrically connected; one end of the current channel corresponding to the fifth secondary winding is electrically connected to the source of the third first synchronous rectifier SR5, the drain of the third first synchronous rectifier SR5 is electrically connected to the negative terminal of capacitor C, and the other end of the current channel corresponding to the fifth secondary winding is electrically connected to the positive terminal of capacitor C; one end of the current channel corresponding to the seventh secondary winding is electrically connected to the source of the fourth first synchronous rectifier SR7, the drain of the fourth first synchronous rectifier SR7 is electrically connected to the negative terminal of capacitor C, and the other end of the current channel corresponding to the seventh secondary winding is electrically connected to the positive terminal of capacitor C.

[0092] In the second-layer circuit board with secondary windings, one end of the current channel corresponding to the second secondary winding is electrically connected to the source of the first second synchronous rectifier SR2, and the drain of the first second synchronous rectifier SR2 is electrically connected to the negative terminal of capacitor C. The other end of the current channel corresponding to the second secondary winding is electrically connected to the positive terminal of capacitor C. Similarly, one end of the current channel corresponding to the fourth secondary winding is electrically connected to the source of the second second synchronous rectifier SR4, and the drain of the second second synchronous rectifier SR4 is electrically connected to the negative terminal of capacitor C. The other end of the current channel corresponding to the fourth secondary winding is electrically connected to the source of the second second synchronous rectifier SR4. The positive terminal of capacitor C is electrically connected; one end of the current path corresponding to the sixth secondary winding is electrically connected to the source of the third second synchronous rectifier SR6, the drain of the third second synchronous rectifier SR6 is electrically connected to the negative terminal of capacitor C, and the other end of the current path corresponding to the sixth secondary winding is electrically connected to the positive terminal of capacitor C; one end of the current path corresponding to the eighth secondary winding is electrically connected to the source of the fourth second synchronous rectifier SR8, the drain of the fourth second synchronous rectifier SR8 is electrically connected to the negative terminal of capacitor C, and the other end of the current path corresponding to the eighth secondary winding is electrically connected to the positive terminal of capacitor C.

[0093] Among them, the two capacitors corresponding to the two secondary windings located on the same magnetic column can be simplified into a single capacitor in the circuit structure.

[0094] According to an embodiment of the present invention, when the transformation ratio of the multi-pillar transformer is Q:1:1, the turns ratio of the nth primary winding wound on the same magnetic column and the two secondary windings corresponding to the nth primary winding is Q / 2:1:1, where Q≥2.

[0095] According to an embodiment of the present invention, by connecting multiple primary windings 104 in series and parallel, the transformation ratio of the multi-core transformer 102 can be adjusted without changing the core structure to adapt to different input and output voltage requirements.

[0096] According to an embodiment of the present invention, a multi-pillar transformer may further include an upper yoke, multiple magnetic pillars, and a lower yoke.

[0097] According to an embodiment of the present invention, the upper magnetic yoke can be a magnetic conductor disposed at the top of the transformer, used to distribute the magnetic flux generated in multiple magnetic columns when a high-frequency AC current corresponding to the high-frequency AC voltage flows into N primary windings, and to transmit the distributed magnetic flux to the lower magnetic yoke through multiple magnetic columns.

[0098] According to an embodiment of the present invention, multiple magnetic pillars may have their first ends disposed on the lower surface of the upper magnetic yoke and their second ends disposed on the upper surface of the lower magnetic yoke. Each magnetic pillar is surrounded by a winding window and each magnetic pillar has an air gap space. The multiple magnetic pillars are used to carry multiple primary windings and multiple secondary windings and provide a magnetic flux channel for magnetic flux transmission.

[0099] According to an embodiment of the present invention, the lower magnetic yoke can be a magnetic conductor disposed at the bottom of the transformer, used to distribute the magnetic flux generated in multiple magnetic columns when a high-frequency AC current corresponding to the high-frequency AC voltage flows into N primary windings, and to transmit the distributed magnetic flux to the upper magnetic yoke through multiple magnetic columns.

[0100] Figure 7A A top view of the core structure of a multi-pillar transformer according to an embodiment of the present invention is shown.

[0101] like Figure 7A As shown, the four magnetic pillars can be symmetrically distributed on the surface of the upper yoke. To ensure that there is no geometric interference between the four magnetic pillars and that the pillars do not exceed the outer boundary of the magnetic core, the outer side length lc of the magnetic core, which can characterize the overall size of the magnetic core structure, and the center-to-center distance l between adjacent magnetic pillars, which can characterize the degree of magnetic flux coupling between the pillars, are used. w The magnetic column radius R1, which can characterize the magnetic flux density distribution and the cross-sectional area of ​​the magnetic column, satisfies a first predetermined relationship, which can be shown in formula (1).

[0102] 2*R1 <l w <l c -2*R1(1)

[0103] Where R1>0.

[0104] Figure 7B A structural side view of the core structure of a multi-pillar transformer according to an embodiment of the present invention is shown.

[0105] like Figure 7B As shown, the core structure of this multi-pillar transformer can be a four-pillar core structure, including an upper yoke, a lower yoke, and four pillars connected between the upper and lower yokes. Winding windows are formed around the pillars. The upper and lower yokes are respectively connected to one end of each pillar, and air gaps exist between each pillar, forming an air gap connection, thus constituting a closed magnetic circuit structure. In this structure, the pillars can carry the windings and provide a magnetic flux channel, while the upper and lower yokes can be used to distribute and merge the magnetic flux between different pillars. Primary and secondary windings can be wound in each winding window. The primary and secondary windings on each pillar can be led out through wires to form electrical ports. The arrangement of the primary and secondary windings on each pillar can be achieved using a multi-layer stacking method, and electrical connections between different circuit boards can be achieved through through-holes or leads. The yoke thickness t can be used to ensure the carrying capacity of the magnetic flux circuit. p >0, which determines the effective height t of the magnetic post, which determines the winding window space and leakage inductance characteristics. l >0 can be used to adjust the equivalent inductance and suppress core saturation. The air gap length l g ≥0, where l g When lg = 0, it indicates that there is no obvious air gap in the magnetic column; when lg > 0, it indicates that there is a relatively obvious air gap in the magnetic column, and the air gap length l g It can be determined based on the target inductance, excitation current, and core material properties.

[0106] Figure 7C A schematic diagram showing the magnetic flux directions of a plurality of primary windings according to an embodiment of the present invention is provided.

[0107] like Figure 7CAs shown, the current direction of the primary winding can be set on each magnetic column, so that the current direction in each magnetic column can be distributed according to a predetermined relationship. Specifically, when the full-bridge circuit outputs a high-frequency AC voltage, the high-frequency AC current corresponding to the high-frequency AC voltage can flow in from one end of the primary winding, pass through each winding in sequence, and be distributed among multiple magnetic columns according to the connection relationship. In each magnetic column, the current can generate a magnetomotive force, thereby establishing a magnetic flux in the magnetic core. The magnetic flux φ / 2 can enter the upper yoke along the direction of the magnetic column, be distributed laterally and longitudinally in the upper yoke, and then return to the lower yoke through other magnetic columns, thus forming a closed magnetic flux loop. By configuring the connection method of each winding, the current magnitude in each magnetic column can satisfy a preset proportional relationship, thereby realizing the distribution of magnetic flux among multiple magnetic columns. This can be characterized as the magnetic flux direction being inward. This can be characterized as the magnetic flux direction being outward.

[0108] In the transformer circuit structure based on multi-column transformer, the magnetic flux density and winding voltage in the circuit can satisfy a second predetermined relationship, which can be shown in formula (2).

[0109] B=U m / (4×f×N×Ae)(2;

[0110] Where B can be characterized as magnetic flux density, U m It can be represented as winding voltage, f can be represented as operating frequency, N can be represented as the number of winding turns, and Ae can be represented as the equivalent core cross-sectional area.

[0111] Meanwhile, since the magnetic flux density in the core cannot be saturated and cannot exceed the maximum magnetic flux density of the core material, the equivalent core cross-sectional area for the upper and lower yokes can be as shown in formula (3), and the winding voltage and the maximum magnetic flux density of the upper and lower yokes can satisfy the third predetermined relationship, which can be as shown in formula (4); the equivalent core cross-sectional area for the magnetic column can be as shown in formula (5), and the winding voltage and the maximum magnetic flux density of the magnetic column can satisfy the fourth predetermined relationship, which can be as shown in formula (6).

[0112] Ae'=t p *l w (3);

[0113] Here, Ae' can be characterized as the equivalent core cross-sectional area for the upper and lower yokes.

[0114] U m / (4×f×N×t p ×l w ) < B m '(4)

[0115] Among them, B m 'It can be characterized as the maximum magnetic flux density of the upper and lower magnetic yokes.'

[0116] Ae''=π* R l 2 (5);

[0117] Here, Ae'' can be characterized as the equivalent core cross-sectional area of ​​the magnetic column.

[0118] U m / (4×f×N×π*R l 2 ) < B m ''(6;

[0119] Among them, B m '' can be characterized as the maximum magnetic flux density of a magnetic column.

[0120] Figure 8 A schematic diagram of the structure of a synchronous rectification module according to an embodiment of the present invention is shown.

[0121] like Figure 8 As shown, in Figure 2A Based on this, the synchronous rectification module can include N rectification and filtering sub-modules and an output sub-module 107.

[0122] Specifically, the nth rectifier and filter submodule may include: an nth first synchronous rectifier, the source of which is electrically connected to the same-name terminal of the (2n-1)th secondary winding, the drain of which is electrically connected to the drain of the nth second synchronous rectifier, and the gate of which is electrically connected to the controller; an nth second synchronous rectifier, the source of which is electrically connected to the opposite-name terminal of the (2n-1)th secondary winding, the drain of which is electrically connected to the first terminal of the nth first capacitor, and the gate of which is electrically connected to the controller; and an nth first capacitor, the first terminal of which is electrically connected to the drain of both the nth first and nth second synchronous rectifiers, and the second terminal of which is electrically connected to the opposite-name terminal of the (2n-1)th secondary winding and the same-name terminal of the (2n-1)th secondary winding.

[0123] like Figure 8As shown, in the first rectifier and filter submodule, the source of the first synchronous rectifier SR1 is electrically connected to the same-name terminal of the first secondary winding M1, the drain of the first synchronous rectifier SR1 is electrically connected to the drain of the first second synchronous rectifier SR2, and the gate of the first synchronous rectifier SR1 is electrically connected to the controller; the source of the first second synchronous rectifier SR2 is electrically connected to the opposite-name terminal of the second secondary winding M2, the drain of the first second synchronous rectifier SR2 is electrically connected to the first terminal of the first capacitor C1, and the gate of the first second synchronous rectifier SR2 is electrically connected to the controller; the first terminal of the first capacitor C1 is electrically connected to the drain of the first synchronous rectifier SR1 and the drain of the first second synchronous rectifier SR2, and the second terminal of the first capacitor C1 is electrically connected to the opposite-name terminal of the first secondary winding M1 and the same-name terminal of the second secondary winding M2.

[0124] The source of the second first synchronous rectifier SR3 in the second rectifier and filter submodule is electrically connected to the same-name terminal of the third secondary winding M3. The drain of the second first synchronous rectifier SR3 is electrically connected to the drain of the second second synchronous rectifier SR4. The gate of the second first synchronous rectifier SR3 is electrically connected to the controller. The source of the second second synchronous rectifier SR4 is electrically connected to the opposite-name terminal of the fourth secondary winding M4. The drain of the second second synchronous rectifier SR4 is electrically connected to the first terminal of the second first capacitor C2. The gate of the second second synchronous rectifier SR4 is electrically connected to the controller. The first terminal of the second first capacitor C2 is electrically connected to the drain of the second first synchronous rectifier SR3 and the drain of the second second synchronous rectifier SR4. The second terminal of the second first capacitor C2 is electrically connected to the opposite-name terminal of the third secondary winding M3 and the same-name terminal of the fourth secondary winding M4.

[0125] The source of the third first synchronous rectifier SR5 in the third rectifier and filter submodule is electrically connected to the same-name terminal of the fifth secondary winding M5. The drain of the third first synchronous rectifier SR5 is electrically connected to the drain of the third second synchronous rectifier SR6. The gate of the third first synchronous rectifier SR5 is electrically connected to the controller. The source of the third second synchronous rectifier SR6 is electrically connected to the opposite-name terminal of the sixth secondary winding M6. The drain of the third second synchronous rectifier SR6 is electrically connected to the first terminal of the third first capacitor C3. The gate of the third second synchronous rectifier SR6 is electrically connected to the controller. The first terminal of the third first capacitor C3 is electrically connected to the drain of the third first synchronous rectifier SR5 and the drain of the third second synchronous rectifier SR6. The second terminal of the third first capacitor C3 is electrically connected to the opposite-name terminal of the fifth secondary winding M5 and the same-name terminal of the sixth secondary winding M6.

[0126] The source of the fourth first synchronous rectifier SR7 in the fourth rectifier and filter submodule is electrically connected to the same-name terminal of the seventh secondary winding M7. The drain of the fourth first synchronous rectifier SR7 is electrically connected to the drain of the fourth second synchronous rectifier SR8. The gate of the fourth first synchronous rectifier SR7 is electrically connected to the controller. The source of the fourth second synchronous rectifier SR8 is electrically connected to the opposite-name terminal of the eighth secondary winding M8. The drain of the fourth second synchronous rectifier SR8 is electrically connected to the first terminal of the fourth first capacitor C4. The gate of the fourth second synchronous rectifier SR8 is electrically connected to the controller. The first terminal of the fourth first capacitor C4 is electrically connected to the drain of both the fourth first synchronous rectifier SR7 and the fourth second synchronous rectifier SR8. The second terminal of the fourth first capacitor C4 is electrically connected to the opposite-name terminal of the seventh secondary winding M7 and the same-name terminal of the eighth secondary winding M8.

[0127] The output submodule 107 may include: a second capacitor Cout, the first terminal of which is electrically connected to the first terminals of N first capacitors, and the second terminal of which is electrically connected to the second terminals of the N first capacitors; and an output load R. L The first terminal of the output load is electrically connected to the first terminal of the second capacitor Cout, and the output load R L The second terminal is electrically connected to the second terminal of the second capacitor Cout.

[0128] The second capacitor Cout can be used to filter the intermediate DC voltage to obtain the target voltage.

[0129] According to an embodiment of the present invention, by setting multiple independent synchronous rectifiers and capacitors adapted to each secondary winding, multiple secondary winding branch circuits that can be independently rectified and filtered can be constructed. While ensuring the current sharing effect of each branch, the heat distribution of the circuit is improved, the device damage caused by excessive local heat growth is avoided, and the reliability and robustness of the transformer circuit are improved.

[0130] like Figure 8 As shown, the full-bridge inverter module may include a full-bridge inverter submodule 801 and a resonant oscillator module 802.

[0131] Specifically, the full-bridge inverter submodule 801 can be electrically connected to the input power supply. The full-bridge inverter submodule includes a first power switch Q1, a second power switch Q2, a third power switch Q3, and a fourth power switch Q4. The first terminal of the first power switch Q1 is electrically connected to the positive terminal of the input power supply, and the second terminal of the first power switch Q1 is electrically connected to the resonant module. The first terminal of the second power switch Q2 is electrically connected to the resonant module, and the second terminal of the second power switch Q2 is electrically connected to the negative terminal of the input power supply. The first terminal of the third power switch Q3 is electrically connected to the positive terminal of the input power supply, and the second terminal of the third power switch Q3 is electrically connected to the resonant module. The first terminal of the fourth power switch Q4 is electrically connected to the resonant module, and the second terminal of the fourth power switch Q4 is electrically connected to the negative terminal of the input power supply. The full-bridge inverter submodule 801 is used to invert the input voltage Vin in response to the control of the duty cycle of the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 to obtain an intermediate high-frequency voltage.

[0132] The resonant module 802 can be electrically connected to the full-bridge inverter submodule 801. The resonant module includes a resonant capacitor C. r Resonant inductor L r And I magnetizing inductors, I = N / 2, 1 ≤ i ≤ I, and resonant capacitor C. r The first terminal is electrically connected to the second terminal of the first power switch Q1, and the resonant capacitor C r The second terminal is connected to the resonant inductor L r The first terminal is electrically connected; resonant inductor L r The second end of the i-th magnetizing inductor is electrically connected to the same-name end of the 2N-1-th primary winding; the first end of the i-th magnetizing inductor is electrically connected to the same-name end of the 2i-1-th primary winding, and the second end of the i-th magnetizing inductor is electrically connected to the opposite-name end of the 2i-th primary winding; the resonator module 802 is used to resonate the intermediate high-frequency voltage to obtain a high-frequency AC voltage.

[0133] like Figure 8 As shown, the resonant capacitor C r The first terminal is electrically connected to the second terminal of the first power switch Q1, and the resonant capacitor C r The second terminal is connected to the resonant inductor L r The first terminal is electrically connected; resonant inductor L r The second end is electrically connected to the same-named end of the first primary winding N1 and the same-named end of the third primary winding N3.

[0134] The first magnetizing inductor L m1 The first terminal is electrically connected to the corresponding terminal of the first primary winding N1, and the first magnetizing inductor L m1 The second terminal is electrically connected to the opposite terminal of the second primary winding N2; the second magnetizing inductor Lm2 The first terminal is electrically connected to the corresponding terminal of the third primary winding N3, and the second magnetizing inductor L m2 The second end is electrically connected to the opposite end of the fourth primary winding N4.

[0135] According to an embodiment of the present invention, a full-bridge inverter module may include a full-bridge inverter submodule and a resonant module. By controlling the on and off states of the first, second, third, and fourth power switches within the full-bridge inverter submodule, the magnetizing inductor stores or releases energy to output a high-frequency AC voltage to the primary winding and controls the polarity of the secondary winding.

[0136] Figure 9 A flowchart of a voltage conversion method according to an embodiment of the present invention is shown.

[0137] like Figure 9 As shown, the voltage conversion method of this embodiment includes operations S910 to S940.

[0138] In operation of S910, the input power supply sends the input voltage to the full-bridge inverter module.

[0139] In operation of the S920, the full-bridge inverter module performs inversion processing on the input voltage to obtain and send a high-frequency AC voltage to the multi-column transformer.

[0140] In operation of S930, based on the turns ratio between the N primary windings and M secondary windings in the multi-column transformer, the high-frequency AC voltage is transformed to obtain and send an intermediate AC voltage to the synchronous rectification module.

[0141] In operation of S940, the N rectification and filtering submodules and output submodules in the synchronous rectification module rectify and filter the intermediate AC voltage to obtain and output the target voltage.

[0142] Those skilled in the art will understand that the features described in the various embodiments of the present invention can be combined or combined in various ways, even if such combinations or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments of the present invention can be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All such combinations and / or combinations fall within the scope of the present invention.

Claims

1. A transformer circuit structure based on a multi-column transformer, characterized in that, include: The full-bridge inverter module is electrically connected to the input power supply and is used to invert the input voltage to obtain a high-frequency AC voltage. A multi-column transformer, electrically connected to the full-bridge inverter module, includes N primary windings and M secondary windings. The nth primary winding and the two secondary windings corresponding to the nth primary winding are wound on the same magnetic column. The N primary windings and M secondary windings are used together to transform the high-frequency AC voltage to obtain an intermediate AC voltage. N≥4 and N is an integer multiple of 4, 1≤n≤N, M=2N, P is a positive integer greater than 1, and 1≤p<P. The synchronous rectification module, electrically connected to the multi-column transformer, includes N parallel rectifier and filter sub-modules and an output sub-module electrically connected to the N rectifier and filter sub-modules. The input terminal of the nth rectifier and filter sub-module is electrically connected to the two secondary windings corresponding to the nth primary winding. The output terminal of the nth rectifier and filter sub-module is electrically connected to the output sub-module. The N rectifier and filter sub-modules are used to rectify the intermediate AC voltage to obtain an intermediate DC voltage. The output sub-module is used to filter the intermediate DC voltage to obtain and output the target voltage. In the case of N=4, the same-name terminal of the first primary winding is electrically connected to the same-name terminal of the third primary winding, and the opposite-name terminal of the first primary winding is electrically connected to the same-name terminal of the second primary winding; the opposite-name terminal of the second primary winding is electrically connected to the opposite-name terminal of the fourth primary winding; the opposite-name terminal of the third primary winding is electrically connected to the same-name terminal of the fourth primary winding; the same-name terminal of the m-th secondary winding is electrically connected to the first input terminal of the n-th rectifier-filter submodule corresponding to the m-th and m+1-th secondary windings; the opposite-name terminal of the m-th secondary winding is electrically connected to the same-name terminal of the m+1-th secondary winding; the opposite-name terminal of the m+1-th secondary winding is electrically connected to the second input terminal of the n-th rectifier-filter submodule, where 1≤m<M; With N=4P, four primary windings form one primary winding unit. The same-name terminal of the first primary winding in the p-th primary winding unit is electrically connected to the same-name terminal of the third primary winding in the p-th primary winding unit and the same-name terminal of the first primary winding in the (p+1)-th primary winding unit. The opposite-name terminal of the first primary winding in the p-th primary winding unit is electrically connected to the same-name terminal of the second primary winding in the p-th primary winding unit. The opposite-name terminal of the second primary winding in the p-th primary winding unit is electrically connected to the opposite-name terminal of the fourth primary winding in the p-th primary winding unit. The p-th primary winding unit... The opposite-name terminal of the third primary winding in the p-th primary winding unit is electrically connected to the same-name terminal of the fourth primary winding in the p-th primary winding unit; the opposite-name terminal of the fourth primary winding in the p-th primary winding unit is electrically connected to the opposite-name terminal of the fourth primary winding in the p+1-th primary winding unit; the same-name terminal of the m-th secondary winding is electrically connected to the first input terminal of the n-th rectifier-filter submodule corresponding to the m-th and m+1-th secondary windings; the opposite-name terminal of the m-th secondary winding is electrically connected to the same-name terminal of the m+1-th secondary winding; the opposite-name terminal of the m+1-th secondary winding is electrically connected to the second input terminal of the n-th rectifier-filter submodule.

2. The circuit structure according to claim 1, characterized in that, With N primary windings distributed on an even number of circuit board layers and N magnetic pillars, the conductive paths within the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulating gaps within the circuit board are symmetrically distributed on both sides of the central axis along the first direction. In the case where the even-numbered circuit board has two layers and N=4, the high-frequency AC current corresponds to the high-frequency AC voltage. The first conductive path flows into the second conductive path of the second circuit board through the first conductive path and the first via in the first circuit board, and then flows into the second conductive path of the first circuit board through the second via in the second circuit board. It flows into the second conductive path in the second circuit board through the third conductive path and the third via in the first circuit board, and then into the fourth conductive path in the first circuit board through the fourth via in the second circuit board. So that the first primary winding is connected in series with the second primary winding, the third primary winding is connected in series with the fourth primary winding, the first primary winding is connected in parallel with the second primary winding and the third primary winding is connected in parallel with the fourth primary winding, and the high-frequency AC current flows out along the current output terminal located on the same side as the current input terminal. In this circuit board, different conductive paths located on the same layer are isolated by insulating gaps; the first conductive path in the first layer of the circuit board is formed by winding the first primary winding along two magnetic pillars parallel to the central axis; the first conductive path in the second layer of the circuit board is formed by winding the second primary winding along two magnetic pillars parallel to the central axis; the third conductive path in the first layer of the circuit board is formed by winding the third primary winding along two other magnetic pillars parallel to the central axis; and the second conductive path in the second layer of the circuit board is formed by winding the fourth primary winding along two other magnetic pillars parallel to the central axis.

3. The circuit structure according to claim 1, characterized in that, When N primary windings are distributed on an odd number of layers of circuit board and the number of magnetic pillars is N, with the central axis of the circuit board extending along the first direction as the axis of symmetry, the conductive paths in the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulating gaps in the circuit board are symmetrically distributed on both sides of the central axis along the first direction. In the case of an odd-numbered circuit board with three layers and N=4, the high-frequency AC current corresponds to the high-frequency AC voltage. The first conductive path flows into the second conductive path of the second circuit board through the first conductive path and the first via in the first circuit board, the second via in the second circuit board flows into the first conductive path of the third circuit board, the third via in the third circuit board flows into the second conductive path of the second circuit board, and the fourth via in the second circuit board flows into the second conductive path of the first circuit board. The third conductive path flows into the third conductive path of the second circuit board through the third conductive path and the fifth via in the first circuit board, the sixth via in the second circuit board flows into the second conductive path of the third circuit board, the seventh via in the third circuit board flows into the fourth conductive path of the second circuit board, and the eighth via in the second circuit board flows into the fourth conductive path of the first circuit board. This allows the high-frequency alternating current to flow out along the current output terminal, which is located on the same side as the current input terminal. In this circuit board, different conductive paths located within the same circuit board layer are isolated by insulating gaps. The first conductive path within the first circuit board layer is formed by winding the first primary winding along two magnetic pillars parallel to the central axis. The first conductive path within the second circuit board layer is formed by winding the second primary winding along two magnetic pillars parallel to the central axis. The third conductive path within the first circuit board layer is formed by winding the third primary winding along two other magnetic pillars parallel to the central axis. The third conductive path within the second circuit board layer is formed by winding the fourth primary winding along two other magnetic pillars parallel to the central axis.

4. The circuit structure according to claim 1, characterized in that, With four primary windings distributed on a two-layer circuit board and six magnetic pillars, the conductive paths within the circuit board are symmetrically distributed on both sides of the central axis along the first direction, and the insulating gaps within the circuit board are symmetrically distributed on both sides of the central axis along the first direction. High-frequency alternating current corresponding to high-frequency alternating voltage. The first conductive path flows into the second conductive path of the second circuit board through the first conductive path and the first via in the first circuit board, and then flows into the second conductive path of the first circuit board through the second via in the second circuit board. It flows into the second conductive path in the second circuit board through the third conductive path and the third via in the first circuit board, and then into the fourth conductive path in the first circuit board through the fourth via in the second circuit board. In this circuit, the first conductive path within the first layer of the circuit board is formed by winding the first primary winding along the first and second magnetic pillars parallel to the central axis; the first conductive path within the second layer of the circuit board is formed by winding the second primary winding along the first and second magnetic pillars parallel to the central axis; the third conductive path within the first layer of the circuit board is formed by winding the third primary winding along the third and fourth magnetic pillars parallel to the central axis; the second conductive path within the second layer of the circuit board is formed by winding the fourth primary winding along the third and fourth magnetic pillars parallel to the central axis; and the fifth and sixth magnetic pillars are located on both sides of the even-numbered layers of the circuit board to suppress the magnetic flux of the yoke in the multi-pillar transformer.

5. The circuit structure according to any one of claims 2 to 4, characterized in that, When the transformation ratio of a multi-column transformer is Q:1:1, the turns ratio of the nth primary winding wound on the same column to the two secondary windings corresponding to the nth primary winding is Q / 2:1:1, where Q≥2.

6. The circuit structure according to claim 1, characterized in that, Multi-column transformers also include: The upper yoke, a magnetic conductor located at the top of the transformer, is used to distribute the magnetic flux generated in multiple magnetic columns when a high-frequency AC current corresponding to the high-frequency AC voltage flows into N primary windings, and to transmit the distributed magnetic flux to the lower yoke through multiple magnetic columns. Multiple magnetic pillars, with the first end of each magnetic pillar disposed on the lower surface of the upper magnetic yoke and the second end of each magnetic pillar disposed on the upper surface of the lower magnetic yoke. Each magnetic pillar is surrounded by a winding window and has an air gap space. The multiple magnetic pillars are used to carry multiple primary windings and multiple secondary windings and provide a magnetic flux channel for magnetic flux transmission. The lower yoke, a magnetic conductor located at the bottom of the transformer, is used to distribute the magnetic flux generated in multiple magnetic columns when a high-frequency AC current corresponding to the high-frequency AC voltage flows into N primary windings, and to transmit the distributed magnetic flux to the upper yoke through multiple magnetic columns.

7. The circuit structure according to claim 1, characterized in that, The nth rectifier filter submodule includes: The source of the nth first synchronous rectifier is electrically connected to the same-name terminal of the 2n-1th secondary winding, the drain of the nth first synchronous rectifier is electrically connected to the drain of the nth second synchronous rectifier, and the gate of the nth first synchronous rectifier is electrically connected to the controller. The nth second synchronous rectifier has its source electrically connected to the opposite terminal of the 2nth secondary winding, its drain electrically connected to the first terminal of the nth first capacitor, and its gate electrically connected to the controller. The first terminal of the nth first capacitor is electrically connected to the drain of the nth first synchronous rectifier and the drain of the nth second synchronous rectifier, and the second terminal of the nth first capacitor is electrically connected to the opposite terminal of the 2n-1th secondary winding and the same terminal of the 2nth secondary winding. The output submodule includes: The second capacitor has its first terminal electrically connected to the first terminals of N first capacitors, and its second terminal electrically connected to the second terminals of N first capacitors. The output load has its first terminal electrically connected to the first terminal of the second capacitor, and its second terminal electrically connected to the second terminal of the second capacitor.

8. The circuit structure according to claim 1, characterized in that, The full-bridge inverter module includes: The full-bridge inverter submodule is electrically connected to the input power supply. The full-bridge inverter submodule includes a first power switch, a second power switch, a third power switch, and a fourth power switch. The first terminal of the first power switch is electrically connected to the positive terminal of the input power supply, and the second terminal of the first power switch is electrically connected to the resonator module. The first terminal of the second power switch is electrically connected to the resonator module, and the second terminal of the second power switch is electrically connected to the negative terminal of the input power supply. The first terminal of the third power switch is electrically connected to the positive terminal of the input power supply, and the second terminal of the third power switch is electrically connected to the resonator module. The first terminal of the fourth power switch is electrically connected to the resonator module, and the second terminal of the fourth power switch is electrically connected to the negative terminal of the input power supply. The full-bridge inverter submodule is used to invert the input voltage in response to the control of the duty cycle of the first power switch, the second power switch, the third power switch and the fourth power switch to obtain the intermediate high-frequency voltage. The resonant module is electrically connected to the full-bridge inverter submodule. The resonant module includes a resonant capacitor, a resonant inductor, and I magnetizing inductors, where I = N / 2, 1 ≤ i ≤ I. The first terminal of the resonant capacitor is electrically connected to the second terminal of the first power switch, and the second terminal of the resonant capacitor is electrically connected to the first terminal of the resonant inductor. The second terminal of the resonant inductor is electrically connected to the terminal of the primary winding with the same name as the (2n-1)th primary winding. The first terminal of the i-th magnetizing inductor is electrically connected to the same-name terminal of the (2i-1)-th primary winding, and the second terminal of the i-th magnetizing inductor is electrically connected to the opposite-name terminal of the 2i-th primary winding. The resonator module is used to resonate the intermediate high-frequency voltage to obtain the high-frequency AC voltage.

9. A voltage transformation method for the circuit structure according to any one of claims 1 to 8, characterized in that, include: The input power supply sends the input voltage to the full-bridge inverter module; The full-bridge inverter module performs inversion processing on the input voltage to obtain and send a high-frequency AC voltage to the multi-column transformer; Based on the turns ratio between the N primary windings and M secondary windings in the multi-column transformer, the high-frequency AC voltage is transformed to obtain and send an intermediate AC voltage to the synchronous rectification module. The synchronous rectification module contains N rectification and filtering sub-modules and an output sub-module that rectify and filter the intermediate AC voltage to obtain and output the target voltage.

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