Transformer assembly, transformer, and power converter

Abstract

Embodiments of the present application provide a transformer assembly (10), a transformer (20), and a power converter. The transformer assembly (10) is used for the transformer (20). The transformer assembly (10) comprises: a current transformer (11) and a fixing member (12). The fixing member (12) comprises a first fixing portion (121) and a second fixing portion (122). The first fixing portion (121) is connected to the second fixing portion (122), and the first fixing portion (121) is used for fixing at least part of a transformer winding (21). The second fixing portion (122) is provided with a recess (122a), the recess (122a) being used for accommodating at least part of the current transformer (11).

Description

Transformer components, transformers and power converters

[0001] Related applications

[0002] This application claims priority to Chinese patent application filed on July 23, 2024, with application number 202421757050X, entitled "Transformer Assembly, Transformer and Power Converter", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power electronics technology, and in particular to transformer components, transformers, and power converters. Background Technology

[0004] A transformer is a device that changes alternating current voltage through the principle of electromagnetic induction, enabling voltage changes between its input and output terminals. A transformer typically consists of a primary winding, a secondary winding, and a magnetic core. The ratio of the primary to the secondary winding determines the relationship between the input and output voltages.

[0005] In some applications of transformers, it is necessary to install current transformers to measure the input or output current of the transformer. Therefore, in related technologies, current transformers and transformers are integrated into one unit.

[0006] However, integrating current transformers with transformers in related technologies carries a certain risk of insulation failure. Summary of the Invention

[0007] Based on this, embodiments of this application provide a transformer assembly, a transformer, and a power converter.

[0008] A first aspect of this application provides a transformer assembly for a transformer, the transformer assembly comprising:

[0009] Current transformer;

[0010] The fastener includes a first fixing part and a second fixing part, the first fixing part being connected to the second fixing part, the first fixing part being used to fix at least a portion of the transformer winding, and the second fixing part being provided with a groove for accommodating at least a portion of the current transformer.

[0011] In some embodiments, the second fixing part has a mounting surface, and the groove is disposed on the side of the second fixing part opposite to the mounting surface.

[0012] In some embodiments, the second fixing part has a mounting surface, and the groove is disposed on the mounting surface of the second fixing part.

[0013] In some embodiments, the second fixing portion is disposed on the circuit board, and the mounting surface is disposed facing the circuit board.

[0014] In some embodiments, the current transformer includes a transformer winding, the transformer winding includes a first lead, and a first distance between the transformer winding and the first lead is greater than or equal to the safety distance.

[0015] In some embodiments, the second fixing part includes a first pin, the first lead is electrically connected to the first pin, and the second distance between the current transformer winding and the first pin is greater than or equal to the safety distance.

[0016] In some embodiments, the current transformer includes a transformer winding, at least a portion of the surface of the transformer winding is covered with an insulating element, the transformer winding includes a second lead, the transformer winding includes a first lead, and a third distance between the second lead and the first lead is greater than or equal to a safety distance.

[0017] In some embodiments, the current transformer winding further includes a winding body, the surface of which is covered with the insulating member, the second fixing part includes a first pin and a second pin, the first lead is electrically connected to the first pin, the distance between the winding body and the first pin is a fourth distance, the second lead is electrically connected to the second pin, the distance between the winding body and the second pin is a fifth distance, and the sum of the fourth distance and the fifth distance is greater than or equal to the safety distance.

[0018] In some embodiments, the current transformer includes a magnetic core in the shape of a ring.

[0019] In some embodiments, the groove is a circular ring structure, and the magnetic core can be fitted into the groove.

[0020] In some embodiments, the current transformer includes a transformer winding wound around a magnetic core, and a portion of the transformer winding located in the second fixed part passes through the magnetic core.

[0021] In some embodiments, the second fixing part is provided with a through hole, which is located within the area enclosed by the sidewall of the groove, and the portion of the transformer winding located in the second fixing part passes through the through hole.

[0022] In some embodiments, the shape of the groove is adapted to the shape of the magnetic core.

[0023] A second aspect of this application provides a transformer, including a transformer core, transformer windings, and the transformer assembly described in any one of the preceding claims.

[0024] A third aspect of this application provides a power converter, the power converter including a circuit board and the transformer described above, the transformer being electrically connected to the circuit board. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the disclosed drawings without creative effort.

[0026] Figure 1 is a first-view schematic diagram of the transformer assembly in the first embodiment of this application.

[0027] Figure 2 is an enlarged view of point A in Figure 1.

[0028] Figure 3 is a second-view schematic diagram of the transformer assembly in the first embodiment of this application.

[0029] Figure 4 is a second-view schematic diagram of the transformer assembly in the second embodiment of this application.

[0030] Figure 5 is a third-view schematic diagram of a transformer in one embodiment of this application.

[0031] Figure 6 is a fourth-view schematic diagram of the transformer assembly in the third embodiment of this application.

[0032] Figure 7 is a fifth-view schematic diagram of the transformer assembly in the fourth embodiment of this application.

[0033] Figure 8 is a fifth-view schematic diagram of the transformer assembly in the fifth embodiment of this application.

[0034] Explanation of reference numerals in the attached figures: 10. Transformer assembly; 11. Current transformer; 111. Transformer winding; 1111. Winding body; 1112. Second lead-out terminal; 112. Magnetic core; 12. Fixing member; 121. First fixing part; 122. Second fixing part; 122a. Groove; 1221. First pin; 1222. Second pin; 122b. Through hole; 12a. Mounting surface; 20. Transformer; 21. Transformer winding; 211. First lead-out terminal; 22. Transformer magnetic core. Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] In the description of this application, it should be understood that if terms such as "thickness", "upper", "top", "bottom", "inner", "outer", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0037] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0038] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" the second feature indicates that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "upper," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] A transformer includes a transformer assembly and transformer windings wound on the transformer assembly. The current in the transformer windings is usually detected by a current transformer.

[0042] In traditional testing processes, one approach is to separate the current transformer from the transformer winding, but this method tends to result in complex and bulky equipment. Another approach is to integrate the current transformer with the transformer winding to reduce the equipment size. However, since the transformer winding conductors have a higher voltage than the current transformer, there is a voltage difference between them. Therefore, when the voltage difference between the transformer winding and the current transformer is large and they are close together after integration, the air and insulation materials between the transformer winding and the current transformer can be broken down, causing insulation failure and the risk of short circuits between the transformer winding and the current transformer.

[0043] Referring to Figures 1, 2, and 3, based on this, and addressing the problem of insulation failure in transformers after the integration of traditional transformer windings and current transformers, this application provides a transformer assembly 10 for use in a transformer 20, which includes a transformer winding 21.

[0044] The transformer assembly 10 includes a current transformer 11 and a fixing member 12. The fixing member 12 includes a first fixing part 121 and a second fixing part 122 connected to the first fixing part 121. The first fixing part 121 is used to fix at least a portion of the transformer winding 21 to facilitate the winding of the transformer winding 21 around the magnetic core or iron core of the transformer 20.

[0045] The second fixing part 122 is provided with a groove 122a, which is used to accommodate at least a portion of the current transformer 11. This increases the distance between the current transformer 11 and the transformer winding 21 while keeping the volume of the transformer assembly 10 unchanged, thereby reducing the probability of insulation failure. Furthermore, when at least a portion of the current transformer 11 is housed within the inner wall of the groove 122a, it is blocked by the inner wall, increasing the distance between the portion of the current transformer 11 disposed in the groove 122a and the transformer winding 21, thus also reducing the probability of insulation failure between the current transformer 11 and the transformer winding 21. In addition, when the distance between the current transformer 11 and the transformer winding 21 meets the safety distance requirement, by placing the current transformer 11 in the groove 122a, the space occupied by the current transformer 11 outside the groove 122a can be reduced, thereby reducing the overall volume of the transformer assembly 10. Furthermore, it also shortens the distance between the groove 122a and the transformer winding 21, thereby reducing the volume of the transformer assembly 10.

[0046] It should be noted that the transformer winding 21 is formed by winding a conductive first wire around the transformer's magnetic core or iron core. The surface of the first wire is covered with an insulating material to reduce the probability of short circuit caused by insulation failure of the first wire itself. The specific form of the insulating material is not limited. For example, the surface of the first wire can be coated with insulating varnish to form an insulating material; or the surface of the first wire can be covered with insulating plastic to form an insulating material.

[0047] It should be noted that a portion of the transformer winding 21 is located in the first fixed part 121 for transformer transformation, and another portion is located in the second fixed part 122 to facilitate electrical connection between the transformer winding 21 and external components. It can be understood that the portion of the transformer winding 21 located in the second fixed part does not need to be wound. The current transformer 11 is fitted in the portion of the transformer winding 21 in the second fixed part to detect the current in the transformer winding 21.

[0048] In specific embodiments of this application, it will be understood that the materials used to make the first fixing part 121 and the second fixing part 122 have high electrical resistance. The specific materials used to make the first fixing part 121 and the second fixing part 122 are not limited, and may include, for example, phenolic plastics, flame-retardant nylon, flame-retardant PET (Polyethylene Terephthalate), flame-retardant PBT (Polybutylene Terephthalate), LCP (Liquid Crystal Polymer), etc.

[0049] Please refer to Figures 1 and 2. In some embodiments, the current transformer 11 is entirely housed within the groove 122a, which helps to reduce the external space occupied by the current transformer 11, thereby reducing the volume of the transformer assembly 10. Here, "the current transformer 11 is entirely housed within the groove 122a" means that the groove edge of the groove 122a protrudes beyond the top surface of the current transformer 11.

[0050] It is understandable that the shape of the groove 122a can be adapted to the shape of the current transformer 11 housed therein, as long as the current transformer 11 can be housed in the groove 122a.

[0051] Please continue to refer to Figures 1, 2 and 3. In some embodiments, the second fixing part 122 has a mounting surface 12a, wherein the mounting surface 12a refers to the surface of the second fixing part 122 facing the external component when it is mounted on the external component.

[0052] A groove 122a is provided on the side of the second fixing part 122 opposite to the mounting surface 12a. Correspondingly, the current transformer 11 is also provided on the side of the second fixing part 122 opposite to the mounting surface 12a. Therefore, when the current transformer 11 is connected to an external component, the portion between them separated by the second fixing part 122 increases the resistance between the portion of the current transformer 11 provided in the groove 122a and the transformer winding 21, thereby reducing the probability of insulation failure between the current transformer 11 and the transformer winding 21. At the same time, the portion between the current transformer 11 and the external component separated by the second fixing part 122 can reduce the probability of insulation failure between the current transformer 11 and the circuit board. In the direction perpendicular to the mounting surface, the external component can arrange circuitry at the position corresponding to the current transformer 11, thereby improving the utilization rate of the external component.

[0053] It is understandable that external components have circuits, and the circuits in external components have current and a certain voltage.

[0054] In some other embodiments, referring to FIG4, the second fixing part 122 has a mounting surface 12a, and a groove 122a is provided on the mounting surface 12a of the second fixing part 122. It is understood that the mounting surface 12a is oriented towards external components, and the current transformer 11 is located in the space formed between the wall of the groove 122a and the mounting surface 12a. Thus, on the side facing away from the mounting surface 122a, the space occupied by the current transformer 11 can be reduced, facilitating the placement of other components.

[0055] In some embodiments, the external component is a circuit board (a circuit board is a substrate used for mounting electronic or electrical components and connecting circuits, and the circuit board has conductive lines). The second fixing part 122 is disposed on the circuit board, and the mounting surface 12a is disposed facing the circuit board, which facilitates the transformer winding 21 and the current transformer 11 to be electrically connected to the external component through the lines on the circuit board.

[0056] Specifically, the second fixing part 122 is disposed on the circuit board, the mounting surface 12a can be disposed facing the circuit board, and the groove 122a is disposed on the side of the second fixing part 122 facing away from the mounting surface 12a. That is, the current transformer 11 is disposed on the side of the second fixing part 122 facing away from the mounting surface 12a. Therefore, the current transformer 11 is spaced apart from the circuit board by the portion of the second fixing part 122.

[0057] Thus, by placing the current transformer 11 on the side away from the mounting surface 12a, and having a second fixing part 122 between the current transformer 11 and the circuit board, the probability of insulation failure between the current transformer 11 and the circuit board is reduced. In the direction perpendicular to the mounting surface, the circuit board can arrange the circuit at the position corresponding to the current transformer 11, thereby improving the utilization rate of the circuit board.

[0058] In some embodiments, referring to Figures 1, 2, and 3, the transformer winding 21 includes a first lead-out terminal 211. The current transformer 11 includes a transformer winding 111, and the first distance between the transformer winding 111 and the first lead-out terminal 211 is greater than or equal to the safety distance. It is understood that the transformer winding 111 is formed by winding a second conductive wire. Since the voltage difference between each turn of the second wire is particularly small during winding, the second wire only needs to meet the functional insulation requirements. Therefore, the second wire may not be covered with an insulating component, which helps to reduce the volume occupied by the transformer winding 111 and also helps to reduce costs.

[0059] The first lead 211 refers to one end of the transformer winding 21 that is electrically connected to external components. It can be understood that the first lead 211 is not covered with an insulating material so that it can be electrically connected to external components.

[0060] The first distance refers to the shortest distance in space between the current transformer winding 111 and the first lead 211 without obstruction. For example, referring to Figure 6, L1 in Figure 6 represents the shortest distance between the current transformer winding 111 and the first lead 211 on the plane, to illustrate the approximate distance between the current transformer winding 111 and the first lead 211, while the first distance is the spatial unfolding of L1, and the first distance is greater than L1.

[0061] Safety distance refers to the minimum distance required between two conductors to meet insulation requirements. It is understandable that the specific value of the safety distance is related to the voltage of the transformer winding 21 and the voltage of the current transformer 11 during operation; the greater the voltage difference between the two, the greater the safety distance. Furthermore, it is understandable that when there is an insulator (an insulating medium other than air, such as glass or ceramic) between the two conductors, the insulation prevents a short circuit due to insulation failure, making it easier to meet the safety distance requirement. However, when there is no insulator between the two conductors, insulation failure is more likely to occur, breaking down the air and causing a short circuit; therefore, meeting the safety distance requirement is even more crucial.

[0062] Thus, by making the first distance between the current transformer winding 111 and the first lead 211 greater than or equal to the safety distance, it is beneficial to meet the distance requirements between the current transformer winding 111 and the first lead 211, thereby reducing the probability of short circuits in the current transformer winding 111 and the transformer winding 21 caused by insulation failure.

[0063] In some specific embodiments of this application, the safety distance is 6.3 mm, and the first distance between the current transformer winding 111 and the first lead-out terminal 211 is greater than or equal to 6.3 mm.

[0064] In some embodiments, referring to Figures 1, 2 and 3, the second fixing part 122 includes a first pin 1221, and a first lead-out terminal 211 is electrically connected to the first pin 1221 so that the first lead-out terminal 211 can be connected to an external circuit through the first pin 1221. The second distance between the current transformer winding 111 and the first pin 1221 is greater than or equal to the safety distance.

[0065] The second distance refers to the shortest unobstructed distance in space between the current transformer winding 111 and the first pin 1221. For example, referring to Figure 7, L2 in Figure 7 represents the shortest distance between the current transformer winding 111 and the first pin 1221 on the plane, to illustrate the approximate distance between the current transformer winding 111 and the first pin 1221, while the second distance is the spatial unfolding of L2, and the second distance is greater than L2.

[0066] Thus, by making the second distance between the current transformer winding 111 and the first pin 1221 greater than or equal to the safety distance, it is beneficial to meet the distance requirements between the current transformer winding 111 and the first pin 1221, thereby reducing the probability of short circuits in the current transformer winding 111 and the transformer winding 21 caused by insulation failure.

[0067] In some specific embodiments of this application, the safety distance is 6.3 mm, and the first distance between the current transformer winding 111 and the first pin 1221 is greater than or equal to 6.3 mm.

[0068] In some embodiments, referring to Figures 1, 2, and 3, the current transformer 11 includes a transformer winding 111, at least a portion of which is covered with an insulating element to increase the resistance between the transformer winding 111 and the outside, thereby reducing the probability of insulation failure between the transformer winding 111 and the outside. The transformer winding 111 includes a second lead 1112, which is not covered with an insulating element to facilitate connection with an external circuit. The transformer winding 21 includes a first lead 211, which is electrically connected to an external circuit. The third distance between the second lead 1112 and the first lead 211 is greater than or equal to the safety distance.

[0069] It should be noted that "at least a portion of the surface of the transformer winding 111 is covered with an insulating element" means that at least a portion of the surface of the second conductor forming the transformer winding 111 is covered with an insulating element to reduce the risk of insulation failure of the second conductor itself. The specific form of the insulating element is not limited; for example, it can be formed by coating the surface of the second conductor with insulating varnish or by covering the surface of the second conductor with insulating plastic.

[0070] The second lead 1112 refers to one end of the current transformer winding 111 that is electrically connected to external components. It is understood that the second lead 1112 is not covered with an insulating material to enable electrical connection with external components.

[0071] The third distance refers to the shortest unobstructed distance in space between the second lead 1112 and the first lead 211. For example, referring to Figure 6, L3 in Figure 6 represents the shortest distance in the plane between the transformer winding 111 and the first lead 211, to illustrate the approximate distance between the transformer winding 111 and the first lead 211, while the third distance is the spatial unfolding of L3, and the third distance is greater than L3.

[0072] Thus, by making the third distance between the first lead 211 and the second lead 1112 greater than or equal to the safety distance, it is beneficial to meet the distance requirements between the first lead 211 and the second lead 1112, thereby reducing the probability of short circuits in the transformer winding 111 and the transformer winding 21 caused by insulation failure.

[0073] In some specific embodiments of this application, the safety distance is 6.3 mm, and the third distance between the second lead-out terminal 1112 and the first lead-out terminal 211 is greater than or equal to 6.3 mm.

[0074] In some embodiments, referring to Figures 1, 2, and 3, the transformer winding 111 further includes a winding body 1111 covered with an insulating element. The second fixing part 122 includes a first pin 1221 and a second pin 1222. The first lead-out end 211 is electrically connected to the first pin 1221, so that the first lead-out end 211 is electrically connected to an external circuit through the first pin 1221. The distance between the winding body 1111 and the first pin 1221 is a fourth distance. The second lead-out end 1112 is electrically connected to the second pin 1222, so that the second lead-out end 1112 is electrically connected to an external circuit through the second pin 1222. The distance between the winding body 1111 and the second pin 1222 is a fifth distance. The sum of the fourth distance and the fifth distance is greater than or equal to the safety distance.

[0075] It should be noted that the transformer winding 111 is formed by a second conductor. A portion of the surface of the second conductor is covered with an insulating material to form the winding body 1111, while the other portion of the second conductor is not covered with an insulating material to form the second lead-out terminal 1112.

[0076] The fourth distance refers to the shortest distance in space between the winding body 1111 and the first pin 1221 without obstruction. For example, referring to Figure 8, L4 in Figure 8 represents the shortest distance between the winding body 1111 and the first pin 1221 on the plane, to illustrate the approximate distance between the winding body 1111 and the first pin 1221, while the fourth distance is the spatial unfolding of L4, and the fourth distance is greater than L4.

[0077] The fifth distance refers to the shortest distance in space between the winding body 1111 and the second pin 1222 without obstruction. For example, referring to Figure 8, L4 in Figure 8 represents the shortest distance between the winding body 1111 and the second pin 1222 on the plane, to illustrate the approximate distance between the winding body 1111 and the second pin 1222, while the fifth distance is L5 unfolded in space, and the fifth distance is greater than L5.

[0078] Thus, by making the fourth and fifth distances greater than or equal to the safety distances, it is beneficial to meet the distance requirements between the first lead-out terminal 211 and the second lead-out terminal 1112 and the winding body 1111, thereby reducing the probability of insulation failure causing short circuits in the transformer winding 111 and the transformer winding 21 respectively.

[0079] In some specific embodiments of this application, the safety distance is 6.3 mm, and the sum of the fourth distance and the fifth distance is greater than or equal to 6.3 mm.

[0080] In some embodiments, referring to Figures 1, 2, 3, and 4, the current transformer 11 includes a magnetic core 112, with a transformer winding 111 wound around the magnetic core 112. A portion of the transformer winding 21 located in the second fixing part 122 passes through the magnetic core 112 to generate an electromagnetic field when energized. This allows the transformer winding 111 to detect the current in the transformer winding 21 by sensing changes in the electromagnetic field. The magnetic core 112 enhances the change in the electromagnetic field, thus facilitating sensing by the transformer winding 111. Specifically, the magnetic core 112 is annular, which facilitates the passage of the portion of the transformer winding 21 located in the second fixing part 122. It is understood that in other embodiments, the shape of the magnetic core 112 can be determined as needed, as long as it facilitates the passage of the portion of the transformer winding 21 located in the second fixing part 122; this is not limited here.

[0081] Correspondingly, the groove 122a is also a ring structure that matches the magnetic core 112, so that the magnetic core 112 can be fitted into the groove 122a, which facilitates the assembly of the magnetic core 112 and the groove 122a.

[0082] In some embodiments, referring to Figures 1, 2, 3 and 4, the second fixing part 122 is provided with a through hole 122b, which is located within the area enclosed by the side wall of the groove 122a. The portion of the transformer winding 21 located in the second fixing part 122 passes through the through hole 122b to facilitate the passage of the magnetic core 112.

[0083] This application provides a transformer 20, as shown in FIG5, including a transformer core 22, a transformer winding, and a transformer assembly 10 as described in any of the above claims.

[0084] The transformer 20 provided in this application integrates the current transformer 11 into the transformer assembly 10 described above. Simultaneously, by providing a first fixing part 121 and a second fixing part 122 in the transformer assembly 10, at least a portion of the transformer winding 21 and the current transformer 11 can be respectively mounted. By providing a groove 122a in the second fixing part 122, at least a portion of the current transformer 11 can be accommodated, which helps reduce the probability of insulation failure and also helps reduce the volume of the transformer assembly 10, thereby reducing the volume of the transformer 20.

[0085] This application provides a power converter, which includes a circuit board and the transformer described above, with the transformer electrically connected to the circuit board.

[0086] Power converters can be micro-inverters, energy storage converters, optimizers, etc. For example, the DC terminal of a power converter can be connected to a DC source, and the AC terminal can be connected to an AC source, allowing the power converter to convert input DC power into AC power output, or vice versa. For instance, power converters can be applied in the field of photovoltaic power generation technology. The DC power generated by photovoltaic power generation technology is converted back into AC power by the power converter, and this AC power becomes usable electrical energy and is input to the power grid through a connector.

[0087] The power converter provided in this application embodiment, by using the transformer 20 described above, helps to reduce the probability of insulation failure and also helps to reduce the size of the transformer 20, thereby helping to reduce the size of the power converter.

[0088] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0089] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A transformer assembly for use in a transformer, wherein, The transformer assembly comprises: a current transformer; a fixing member comprising a first fixing part and a second fixing part, the first fixing part being connected with the second fixing part, the first fixing part being used for fixing at least part of a transformer winding, the second fixing part being provided with a groove, the groove being used for accommodating at least part of the current transformer.

2. The transformer assembly of claim 1, wherein, The second fixing part has an assembly surface, and the groove is arranged on a surface of the second fixing part opposite to the assembly surface.

3. The transformer assembly of claim 1, wherein, The second fixing part has an assembly surface, and the groove is arranged on the assembly surface of the second fixing part.

4. The transformer assembly of claim 2 or 3, wherein, The second fixing part is arranged on a circuit board, and the assembly surface is arranged towards the circuit board.

5. The transformer assembly of claim 1, wherein, The current transformer comprises a transformer winding, and the transformer winding comprises a first lead-out end, a first distance between the transformer winding and the first lead-out end being greater than or equal to a safety distance.

6. The transformer assembly of claim 5, wherein, The second fixing part comprises a first pin, the first lead-out end being electrically connected with the first pin, and a second distance between the transformer winding and the first pin being greater than or equal to the safety distance.

7. The transformer assembly of claim 1, wherein, The current transformer comprises a transformer winding, and at least part of a surface of the transformer winding is covered with an insulating member, the transformer winding comprising a second lead-out end, the transformer winding comprising a first lead-out end, and a third distance between the second lead-out end and the first lead-out end being greater than or equal to a safety distance.

8. The transformer assembly of claim 7, wherein, The transformer winding further comprises a winding body, a surface of the winding body being covered with the insulating member, the second fixing part comprising a first pin and a second pin, the first lead-out end being electrically connected with the first pin, a fourth distance between the winding body and the first pin, the second lead-out end being electrically connected with the second pin, and a fifth distance between the winding body and the second pin, a sum of the fourth distance and the fifth distance being greater than or equal to the safety distance.

9. The transformer assembly of claim 1, wherein, The current transformer comprises a magnetic core, and the magnetic core has a shape of a circular ring.

10. The transformer assembly of claim 9, wherein, The groove has a structure of a circular ring, and the magnetic core can be arranged in the groove in a fitting manner.

11. The transformer assembly of claim 9, wherein, The current transformer comprises a transformer winding, the transformer winding being arranged around the magnetic core, and the transformer winding being arranged in the second fixing part and passing through the magnetic core.

12. The transformer assembly of claim 9, wherein, The second fixing part is provided with a through hole, the through hole being arranged in a range surrounded by a side wall of the groove, and the transformer winding being arranged in the second fixing part and passing through the through hole.

13. The transformer assembly of claim 9, wherein, The groove has a shape matched with that of the magnetic core.

14. A transformer, wherein, The power transformer comprises a transformer magnetic core, a transformer winding, and the transformer assembly according to any one of claims 1-13.

15. A power converter, wherein, The power transformer comprises a circuit board and the transformer according to claim 14, and the transformer is electrically connected with the circuit board.

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