Transformer and multi-split micro inverter
By designing a highly integrated transformer in a one-to-multi-micro-inverter, using the settings of isolated magnetic columns and columns in the winding, the problems of large size and high losses in the prior art are solved, and more efficient work and cost-reducing effects are achieved.
Patent Information
- Application Number
- CN202420280810.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-05
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-05
AI Technical Summary
The number of magnetic devices in the existing one-to-multi-micro-inverters is too large, resulting in large transformer size and high loss, affecting the overall machine size and efficiency.
A transformer is designed, and its magnetic core includes at least two cavity groups and windings. By isolating the magnetic columns and the columns in the winding, the degree of integration and working efficiency of the transformer are improved.
Reduces the size and loss of the transformer, improves working efficiency and reduces hardware costs.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of transformers, in particular to a transformer and a one-to-many micro inverter. Background Art
[0002] Micro inverters have received widespread attention because they can achieve maximum power point tracking (MPPT) at the module level, do not have the short board effect of module series connection, and can achieve module-level operation and maintenance. In order to further save the use of connectors, a one-to-many micro inverter (one inverter corresponds to multiple photovoltaic modules) has been developed based on one micro inverter corresponding to one photovoltaic module. Among them, transformers and inductors are important components in one-to-many micro inverters, which undertake the functions of voltage transformation, isolation and energy storage.
[0003] In order to achieve the one-to-many effect, the existing technical solution integrates multiple transformers, and each path uses independent transformer devices and inductor devices, or integrates the inductor devices and transformers in the same path. Under the existing solution, the number of magnetic devices in the one-to-many micro-inverter is relatively large, and the size and loss of each transformer are relatively large, which affects the overall size and efficiency of the one-to-many micro-inverter. Utility Model Content
[0004] The utility model provides a transformer and a one-to-many micro-inverter, which are used to improve the integration level of the transformer, reduce the size and loss of the transformer, improve the working efficiency of the transformer, and reduce the hardware cost.
[0005] A first aspect of an embodiment of the utility model provides a transformer, comprising: a magnetic core and at least two windings;
[0006] The magnetic core comprises at least two cavity groups, each cavity group comprises a first cavity and a second cavity;
[0007] An isolated magnetic column is formed between any two adjacent cavity groups;
[0008] Each winding is arranged in each cavity of each cavity group;
[0009] The magnetic fluxes formed by any two adjacent windings on the shared isolated magnetic pole are opposite.
[0010] In a feasible implementation manner, the magnetic core includes a first magnetic core unit, a second magnetic core unit and a third magnetic core unit which are stacked;
[0011] Each core unit includes a first surface and a second surface;
[0012] At least two mounting grooves are provided on the first surface of each magnetic core unit, and an isolation magnetic column is formed between any two adjacent mounting grooves;
[0013] The number of the installation slots is the same as the number of winding paths.
[0014] In a feasible implementation manner, the first surface of the first magnetic core unit abuts against the first surface of the second magnetic core unit, and each mounting groove of the first magnetic core unit and each mounting groove of the second magnetic core unit are correspondingly combined into at least two first cavities;
[0015] The first surface of the third magnetic core unit abuts against the second surface of the second magnetic core unit, and each mounting groove of the third magnetic core unit and the second surface of the second magnetic core unit form at least two second cavities.
[0016] In a feasible implementation manner, the magnetic core includes at least two winding center columns and a magnetic core body;
[0017] The number of the winding poles is the same as the number of winding paths;
[0018] A winding center column is provided in each cavity group.
[0019] In a feasible implementation manner, each winding includes a transformer primary winding, a transformer secondary winding and an inductor winding;
[0020] Wherein, the transformer primary winding and the transformer secondary winding are arranged in corresponding first cavities;
[0021] The inductor winding is arranged in the corresponding second cavity.
[0022] In a feasible implementation manner, the primary winding of the transformer in each winding is arranged at a side of the corresponding first cavity close to the inductor winding, and the secondary winding of the transformer in each winding is arranged at a side of the corresponding first cavity away from the inductor winding.
[0023] In a feasible implementation manner, the secondary winding of the transformer and the inductor winding in each winding are continuously wound.
[0024] In a feasible implementation manner, the currents in the secondary winding of the transformer and the inductor winding in each winding are the same in magnitude and direction.
[0025] In a feasible implementation manner, the magnetic fluxes of the secondary winding of the transformer and the inductor winding in each winding in the shared magnetic circuit on the magnetic core are opposite.
[0026] In a feasible implementation manner, the number of turns of the secondary winding of the transformer in each winding is the same, the number of turns of the primary winding of the transformer in each winding is the same, and the number of turns of the inductor winding in each winding is the same.
[0027] In a feasible implementation manner, a magnetic core center column is disposed in each installation slot.
[0028] In a feasible implementation manner, each magnetic core unit further includes two edge magnetic columns, and the edge magnetic columns are used to provide a partial magnetic circuit for one winding.
[0029] In a feasible implementation manner, the area of the edge magnetic column on the first surface is half of the area of the core column on the first surface, and the area of the isolation magnetic column on the first surface is greater than half of the area of the core column on the first surface.
[0030] In a feasible implementation manner, an air gap is provided between the magnetic core center column of the first magnetic core unit and the magnetic core center column of the second magnetic core unit.
[0031] In a feasible implementation manner, an air gap is provided between the magnetic core center column of the third magnetic core unit and the second surface of the second magnetic core unit.
[0032] A second aspect of the embodiment of the utility model provides a one-to-many micro-inverter, comprising:
[0033] A main power circuit, at least two photovoltaic modules and a transformer as described in any embodiment of the first aspect;
[0034] The main power circuit is used to convert direct current into alternating current;
[0035] The photovoltaic module is used to change the voltage of the direct current generated by the photovoltaic assembly;
[0036] The transformer is used to isolate the primary side and the secondary side of the transformer.
[0037] In the technical solution provided by the embodiment of the utility model, the transformer includes a magnetic core and at least two windings; the magnetic core includes at least two cavity groups, each cavity group includes a first cavity and a second cavity; an isolated magnetic column is formed between any two adjacent cavity groups; each winding is arranged in each cavity of each cavity group; the magnetic flux formed by any two adjacent windings on the shared isolated magnetic column is opposite. The embodiment of the utility model improves the integration level of the transformer, reduces the size and loss of the transformer, improves the working efficiency of the transformer, and reduces the hardware cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0038] Figure 1 A schematic diagram of a transformer in an embodiment of the utility model;
[0039] Figure 2 Another schematic diagram of the magnetic core in the transformer in the embodiment of the utility model;
[0040] Figure 3 Another schematic diagram of the magnetic core in the transformer in the embodiment of the utility model;
[0041] Figure 4 This is a schematic diagram of a transformer in an embodiment of the utility model when the magnetic core is not wound with windings;
[0042] Figure 5 This is a schematic diagram of a transformer after the magnetic core is wound with windings in an embodiment of the utility model;
[0043] Figure 6 This is a schematic structural diagram of the first magnetic core unit in an embodiment of the utility model;
[0044] Figure 7 A schematic diagram of a common magnetic circuit of a transformer in an embodiment of the utility model;
[0045] Figure 8 It is a schematic diagram of a one-to-many micro-inverter in an embodiment of the utility model. DETAILED DESCRIPTION
[0046] The utility model provides a transformer and a one-to-many micro-inverter, which are used to improve the integration level of the transformer, reduce the size and loss of the transformer, improve the working efficiency of the transformer, and reduce the hardware cost.
[0047] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here, for example, can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.
[0048] See also Figure 1 , a schematic diagram of a transformer provided by an embodiment of the utility model specifically includes:
[0049] A magnetic core 100 and at least two windings 200;
[0050] The magnetic core 100 includes at least two cavity groups 300 , each cavity group 300 includes a first cavity 310 and a second cavity 320 ;
[0051] An isolated magnetic column is formed between any two adjacent cavity groups 300;
[0052] Each winding 200 is disposed in each cavity of each cavity group 300;
[0053] The magnetic fluxes formed by any two adjacent windings 200 on the shared isolated magnetic poles are opposite.
[0054] In the embodiment of the utility model, the winding direction of each winding is set so that the magnetic fluxes formed by any two adjacent windings on the shared isolation magnetic column are opposite, and the functions of multiple transformers are integrated together, thereby improving the integration level of the transformer, reducing the size and loss of the transformer, improving the working efficiency of the transformer, and reducing the hardware cost.
[0055] In a possible implementation, Figure 2 As shown, the magnetic core 100 includes a first magnetic core unit 110, a second magnetic core unit 120 and a third magnetic core unit 130 which are stacked;
[0056] Each core unit includes a first surface and a second surface;
[0057] At least two mounting grooves are provided on the first surface of each magnetic core unit, and an isolation magnetic column is formed between any two adjacent mounting grooves;
[0058] The number of the installation slots is the same as the number of winding paths.
[0059] It should be noted that when the magnetic core adopts the structure of the present embodiment, each magnetic core unit can be provided with a wire outlet notch at a position corresponding to the mounting groove to facilitate the outlet of the wire ends of the winding.
[0060] In a possible implementation, Figure 2 As shown, the first surface of the first magnetic core unit 110 abuts against the first surface of the second magnetic core unit 120, and each mounting groove of the first magnetic core unit 110 and each mounting groove of the second magnetic core unit 120 are correspondingly combined into at least two first cavities 310;
[0061] The first surface of the third magnetic core unit 130 abuts against the second surface of the second magnetic core unit 120 , and each mounting groove of the third magnetic core unit 130 and the second surface of the second magnetic core unit form at least two second cavities 320 .
[0062] In this embodiment, the first magnetic core unit 110, the second magnetic core unit 120 and the third magnetic core unit 130 have the same specifications. It is understandable that because the coil in the second cavity 320 formed by the third magnetic core unit 130 and the second magnetic core unit 120 is small, the height of the third magnetic core unit 130 can be appropriately reduced according to actual conditions, thereby reducing the capacity of the second cavity 320, which is not specifically limited here.
[0063] It should be noted that when at least two windings in the transformer provided in this embodiment are three windings, three single transformers are integrated together, such as Figure 3 As shown, the structure of the transformer including three windings is different from that of the transformer including two windings in that one more cavity group (a first cavity and a second cavity) is formed. The working principles of the transformer including three windings and the transformer including two windings are the same. Therefore, in this embodiment and subsequent embodiments, two windings are taken as an example for description.
[0064] In a feasible implementation manner, the magnetic core includes at least two winding center posts and a magnetic core body; the number of the winding center posts is the same as the number of winding paths; and a winding center post is inserted into each cavity group.
[0065] It should be noted that when the magnetic core adopts the structure of the present embodiment, a hollow structure will be formed where the winding center column is installed. Because, when a wire outlet notch is set at the corresponding position of the installation groove of the magnetic core body, the wire outlet notch cannot be set too deep, that is, the diameter of the magnetic core center column must be smaller than the maximum width of the projection area of the transformer in the horizontal direction, so as to ensure the integrity of the magnetic core body and make it a whole.
[0066] In a possible implementation, Figure 2 As shown, each winding 200 includes a transformer primary winding 210, a transformer secondary winding 220 and an inductor winding 230;
[0067] The transformer primary winding 210 and the transformer secondary winding 220 are disposed in the corresponding first cavity 310;
[0068] The inductor winding 230 is disposed in the corresponding second cavity 320 .
[0069] The position of the first cavity 310 can be referred to Figure 3 or Figure 4 As shown, the position of the second cavity 320 can also refer to Figure 3 or Figure 4 As shown, Figure 3 and Figure 4 In the figure, only the first cavity and the second cavity where one winding is located are marked, and the first cavity and the second cavity of other windings are similar and are not shown in the figure.
[0070] It should be noted that each winding is only wound in the stacking direction of the three magnetic core units or wound on the same winding center column, that is, the first cavity where the transformer secondary winding 220 and the transformer primary winding 210 are located in the same winding and the second cavity where the inductor winding 230 is located are continuously arranged in a direction perpendicular to the magnetic core unit (i.e., the stacking direction). The winding can be composed of Litz wire, copper foil or copper sheet, etc., which is not limited here.
[0071] In a possible implementation, Figure 5 As shown, the primary winding of the transformer in each winding is arranged at a side of the corresponding first cavity close to the inductor winding, and the secondary winding of the transformer in each winding is arranged at a side of the corresponding first cavity far from the inductor winding.
[0072] Figure 4 This is a schematic diagram of the magnetic core without winding. Figure 5 The figure is a schematic diagram after winding, where AN1, AN2, and AN3 are the windings of the A-circuit transformer, AN1 is the inductor winding, AN2 is the primary winding, and AN3 is the secondary winding of the transformer. Through the special setting of the winding direction, the magnetic flux in the shared magnetic circuit of AN1 and AN3 cancels each other. Similarly, BN1, BN2, and BN3 are the windings of the B-circuit transformer, BN1 is the inductor winding, BN2 is the primary winding of the transformer, and BN3 is the secondary winding of the transformer. The A-circuit transformer and the B-circuit transformer are integrated together to form a cross-linked magnetic integrated transformer.
[0073] It can be understood that if the second surface of the first magnetic core unit is in contact with the horizontal plane, then the inductor winding is arranged in the second cavity in the magnetic core, and the primary winding of the transformer is arranged in the upper half of the first cavity, and the secondary winding of the transformer is arranged in the lower half corresponding to the first cavity, that is, the secondary winding of the transformer is arranged away from the side of the inductor winding (close to the second surface of the first magnetic core unit).
[0074] In a feasible implementation manner, the transformer secondary winding 220 and the inductor winding 230 in each winding are continuously wound.
[0075] like Figure 5 As shown, AN1, AN2, and AN3 are windings of the A-circuit transformer, AN1 is the inductor winding, and AN3 is the secondary winding of the transformer. AN1 and AN3 are continuously wound together, and the magnetic flux in the shared magnetic circuit of AN1 and AN3 is offset by the special setting of the winding direction. BN1 and BN3 are continuously wound together, and the magnetic flux in the shared magnetic circuit of BN1 and BN3 is offset by the special setting of the winding direction.
[0076] In the embodiment of the present application, the secondary winding of the transformer and the inductor winding in the same winding are connected continuously and share the magnetic circuit, which significantly reduces the size and cost of the device.
[0077] In a feasible implementation manner, the currents in the secondary winding of the transformer and the inductor winding in each winding are the same in magnitude and direction.
[0078] In the embodiment of the present application, since the secondary winding of the transformer and the inductor winding in the same winding are continuously connected, the current in the secondary winding of the transformer and the inductor winding are the same in magnitude and direction.
[0079] In a feasible implementation manner, the magnetic fluxes of the secondary winding of the transformer and the inductor winding in each winding in the shared magnetic circuit on the magnetic core are opposite.
[0080] Because the current in the secondary winding of the transformer and the inductor winding are of the same magnitude and direction, the magnetic flux of the magnetic circuit shared by the secondary winding of the transformer and the inductor winding is always opposite by setting the winding direction, thereby reducing the magnetic loss of the transformer. It can be understood that in the optimal case, the magnetic flux of the magnetic circuit shared by the secondary winding of the transformer and the inductor winding will cancel each other out, that is, zero.
[0081] In a feasible implementation manner, the number of turns of the secondary winding of the transformer in each winding is the same, the number of turns of the primary winding of the transformer in each winding is the same, and the number of turns of the inductor winding in each winding is the same.
[0082] like Figure 5 As shown, AN1, AN2, and AN3 are windings of transformer A, AN1 is an inductor winding, AN2 is a transformer primary winding, and AN3 is a transformer secondary winding. AN1 and AN3 are connected continuously, and BN1, BN2, and BN3 are windings of transformer B, BN1 is an inductor winding, BN2 is a transformer primary winding, and BN3 is a transformer secondary winding. In order to make the parameters of each transformer the same, the number of turns of the windings between each path should be the same, that is, the number of turns of the transformer secondary winding AN3 in the A winding is the same as the number of turns of the transformer secondary winding BN3 in the B winding, the number of turns of the transformer primary winding AN2 in the A winding is the same as the number of turns of the transformer primary winding BN2 in the B winding, and the number of turns of the inductor winding AN1 in the A winding is the same as the number of turns of the inductor winding BN1 in the B winding.
[0083] In a feasible implementation manner, a magnetic core center column is disposed in each installation slot.
[0084] For example, Figure 6As shown, for the first magnetic core unit 110, a magnetic core center column 112 is disposed in each installation slot 111. It is understandable that the structures of the second magnetic core unit and the third magnetic core unit are the same as that of the first magnetic core unit, and will not be described in detail here.
[0085] It should be noted that when the first magnetic core unit, the second magnetic core unit and the third magnetic core unit are stacked, the first surface of the first magnetic core unit abuts against the first surface of the second magnetic core unit, and the first surface of the third magnetic core unit abuts against the second surface of the second magnetic core unit, then the magnetic core center column set on each magnetic core unit can be regarded as a whole, that is, a winding center column. Each winding corresponds to a winding center column, that is, each transformer corresponds to a winding center column.
[0086] In a feasible implementation manner, each magnetic core unit further includes two edge magnetic columns, and the edge magnetic columns are used to provide a partial magnetic circuit for one winding.
[0087] For example, Figure 6 As shown, corresponding to the first magnetic core unit 110, the first magnetic core unit 110 further includes two edge magnetic columns 114, and the edge magnetic columns 114 are used to provide a partial magnetic circuit for one winding.
[0088] Similarly, an isolation magnetic column 113 is formed between two adjacent mounting grooves.
[0089] It should be noted that if Figure 6 As shown, when the first magnetic core unit 110 needs to accommodate two windings, the number of mounting slots 111 is two, the number of corresponding core columns 112 is two, and the number of corresponding isolation magnetic columns 113 is one; when the first magnetic core unit 110 needs to accommodate three windings, the number of mounting slots 111 is three, the number of corresponding core columns 112 is three, and the number of corresponding isolation magnetic columns 113 is two. The number of edge magnetic columns 114 corresponding to the first magnetic core unit 110 is always two. Among them, the structure of the magnetic core unit determines the number of windings that can be accommodated, which can be adjusted according to actual conditions, and the details will not be repeated here.
[0090] In a feasible implementation manner, the area of the edge magnetic column on the first surface is half of the area of the core column on the first surface, and the area of the isolation magnetic column on the first surface is greater than half of the area of the core column on the first surface.
[0091] It should be noted that in order to avoid interference between the two windings, taking into account the unbalanced working state of the two windings, a variety of working conditions need to be considered, such as the two working voltages or currents are inconsistent, or even the worst working condition where one winding is not working and the other is working at full load. At this time, the magnetic flux of the shared magnetic circuit is the largest, and the effective cross-sectional area of the shared magnetic circuit needs to be limited, otherwise it will cause magnetic saturation.
[0092] In this implementation, the effective area of the isolation magnetic columns and the edge magnetic columns is limited to ensure that when any one path in the transformer is working, the energy transmitted will not be transferred to another adjacent path, that is, it will not interfere with the working state of the other path, thereby reducing magnetic loss, improving the working efficiency of the transformer, and at the same time improving the integration level of the transformer, reducing the size of the transformer, and reducing the hardware cost.
[0093] like Figure 6 As shown, assuming that the magnetic core includes A and B paths, the effective cross-sectional area of the core column 112 in each path is Ae, the effective cross-sectional area of the edge magnetic columns 114 on both sides is Ae / 2, and the cross-sectional area of the isolation magnetic column shared by A and B paths must not be less than Ae / 2. Similarly, when the magnetic core includes A, B, and C paths, then the effective cross-sectional area of the core column 112 in each path is Ae, the effective cross-sectional area of the edge magnetic columns 114 on both sides is Ae / 2, the cross-sectional area of the isolation magnetic column shared by A and B paths must not be less than Ae / 2, and the cross-sectional area of the isolation magnetic column shared by C and B paths must not be less than Ae / 2.
[0094] When the magnetic core includes at least two winding center columns and a magnetic core body, the cross-sectional area of the isolated magnetic column in the magnetic core body is greater than half of the cross-sectional area of the winding center column.
[0095] In a feasible implementation manner, an air gap is provided between the magnetic core center column of the first magnetic core unit and the magnetic core center column of the second magnetic core unit.
[0096] The middle column of the transformer core can be added with an air gap depending on the circuit topology used.
[0097] When an air gap needs to be added, an air gap is provided on a contact surface between a magnetic core center column of the first magnetic core unit and a magnetic core center column of the second magnetic core unit.
[0098] In a feasible implementation manner, an air gap is provided between the magnetic core center column of the third magnetic core unit and the second surface of the second magnetic core unit.
[0099] When an air gap needs to be added, an air gap is provided between the magnetic core center column of the third magnetic core unit and the second surface of the second magnetic core unit.
[0100] It should be noted that an air gap cannot be set at the common magnetic circuit of the transformer secondary winding and the inductor winding in each winding, and an air gap cannot be set at the common magnetic circuit of the two windings to ensure that the working conditions of the two windings do not interfere with each other. Figure 7As shown in the figure, the horizontal frame (H frame) is the common magnetic circuit part of the transformer winding (including the transformer primary winding and the transformer secondary winding) and the inductor winding in each winding, and the vertical frame (S frame) is the common magnetic circuit part of the transformer winding of line A and the transformer winding of line B, and the inductor winding of line A and the inductor winding of line B. No air gap can be set in the area of the horizontal frame and the vertical frame to avoid interference.
[0101] The present utility model also provides a one-to-many micro-inverter, which specifically includes:
[0102] In a feasible implementation, a main power circuit, at least two photovoltaic modules and a transformer in any of the above implementations;
[0103] The main power circuit is used to convert direct current into alternating current;
[0104] The photovoltaic module is used to change the voltage of the direct current generated by the photovoltaic assembly;
[0105] The transformer is used to isolate the primary side and the secondary side of the transformer.
[0106] It is understandable that the number of PV modules that can be connected will vary depending on the structure of the transformer, e.g. Figure 8 As shown in the figure, a circuit structure diagram of a one-to-two micro inverter includes, in addition to the A-way photovoltaic module and the B-way photovoltaic module connected to the primary side of the transformer, a main power circuit connected to the secondary side of the transformer. The photovoltaic module also needs to be connected to the photovoltaic assembly. Figure 8 Not shown in FIG.
[0107] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.
[0108] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0109] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0110] Finally, it should be noted that the above embodiments are only specific implementation methods of the utility model, which are used to illustrate the technical solution of the utility model, rather than to limit it. The protection scope of the utility model is not limited thereto. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art should understand that any technician familiar with the technical field can still modify the technical solution recorded in the above embodiments within the technical scope disclosed by the utility model, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiment of the utility model, and should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.
Claims
1. A transformer, characterized in that: include: A magnetic core and at least two windings; The magnetic core comprises at least two cavity groups, each cavity group comprises a first cavity and a second cavity; An isolated magnetic column is formed between any two adjacent cavity groups; Each winding is arranged in each cavity of each cavity group; The magnetic fluxes formed by any two adjacent windings on the shared isolated magnetic pole are opposite.
2. The transformer according to claim 1, characterized in that: The magnetic core comprises a first magnetic core unit, a second magnetic core unit and a third magnetic core unit which are stacked; Each core unit includes a first surface and a second surface; At least two mounting grooves are provided on the first surface of each magnetic core unit, and an isolation magnetic column is formed between any two adjacent mounting grooves; The number of the installation slots is the same as the number of winding paths.
3. The transformer according to claim 2, characterized in that: The first surface of the first magnetic core unit abuts against the first surface of the second magnetic core unit, and each mounting groove of the first magnetic core unit and each mounting groove of the second magnetic core unit are correspondingly combined into at least two first cavities; The first surface of the third magnetic core unit abuts against the second surface of the second magnetic core unit, and each mounting groove of the third magnetic core unit and the second surface of the second magnetic core unit form at least two second cavities.
4. The transformer according to claim 1, characterized in that: The magnetic core comprises at least two winding center columns and a magnetic core body; The number of the winding poles is the same as the number of winding paths; A winding center column is provided in each cavity group.
5. The transformer according to claim 1, characterized in that: Each winding includes a transformer primary winding, a transformer secondary winding and an inductor winding; Wherein, the transformer primary winding and the transformer secondary winding are arranged in corresponding first cavities; The inductor winding is arranged in the corresponding second cavity.
6. The transformer according to claim 5, characterized in that: The primary winding of the transformer in each winding is arranged at a side of the corresponding first cavity close to the inductor winding, and the secondary winding of the transformer in each winding is arranged at a side of the corresponding first cavity far from the inductor winding.
7. The transformer according to claim 5, characterized in that: The secondary winding of the transformer and the inductor winding in each winding are continuously wound.
8. The transformer according to claim 5, characterized in that: The current in the secondary winding of the transformer and the inductor winding in each winding is the same in magnitude and direction.
9. The transformer according to claim 5, characterized in that: The magnetic fluxes of the secondary winding of the transformer and the inductor winding in each winding in the common magnetic circuit on the magnetic core are opposite.
10. The transformer according to claim 5, characterized in that: The number of turns of the secondary winding of the transformer in each winding is the same, the number of turns of the primary winding of the transformer in each winding is the same, and the number of turns of the inductor winding in each winding is the same.
11. The transformer according to claim 2, characterized in that: A magnetic core center column is arranged in each installation slot.
12. The transformer according to claim 11, characterized in that Each magnetic core unit further includes two edge magnetic columns, and the edge magnetic columns are used to provide a partial magnetic circuit for one winding.
13. The transformer according to claim 12, characterized in that: The area of the edge magnetic column on the first surface is half of the area of the magnetic core column on the first surface, and the area of the isolation magnetic column on the first surface is greater than half of the area of the magnetic core column on the first surface.
14. The transformer according to claim 11, characterized in that An air gap is provided between the magnetic core center column of the first magnetic core unit and the magnetic core center column of the second magnetic core unit.
15. The transformer according to claim 11, characterized in that: An air gap is provided between the magnetic core center column of the third magnetic core unit and the second surface of the second magnetic core unit.
16. A one-to-many micro-inverter, characterized in that: include: A main power circuit, at least two photovoltaic modules and a transformer as claimed in any one of claims 1 to 15; The main power circuit is used to convert direct current into alternating current; The photovoltaic module is used to change the voltage of the direct current generated by the photovoltaic assembly; The transformer is used to isolate the primary side and the secondary side of the transformer.