Transformer and home appliance

Abstract

The utility model discloses a transformer and home electrical equipment relates to transformer technical field. Transformer includes core, primary winding, secondary winding and leakage magnetic sheet, and the core includes the upper yoke of head -to -tail connection, first side yoke, lower yoke and second side yoke, the primary winding is set in at least one of first side yoke and second side yoke, and the secondary winding is set in at least one of first side yoke and second side yoke and is arranged with the interval of primary winding, and one leakage magnetic sheet is set between primary winding and secondary winding and is connected with the core. Through canceling the structure design of the center column of core, can effectively reduce the material consumption of core, is favorable to the reduction of cost. Compared with the arrangement scheme of EI shape core, the primary winding and secondary winding of this embodiment have greater heat dissipation space, can improve the overall heat dissipation effect of transformer, effectively reduce the operation temperature rise of transformer, improve the reliability of transformer.

Description

Technical Field

[0001] This utility model relates to the field of transformer technology, and in particular to a transformer and a household appliance. Background Technology

[0002] Leakage inductance high-voltage transformers used in household appliances such as microwave ovens are core energy conversion components. These transformers stack the primary and secondary windings on the central column of an EI-shaped iron core, and use leakage magnetic sheets inserted between the windings to limit the current and stabilize the voltage of the magnetron. However, due to the magnetic circuit structure characteristics of the EI-shaped iron core, the magnetic flux density in areas such as the side yoke is low, resulting in material redundancy and a large overall core usage, which is detrimental to product lightweighting and cost control. All windings are encased in the iron core, causing heat to accumulate inside and be difficult to dissipate effectively. This leads to high temperature rise and poor heat dissipation after prolonged operation, reducing the transformer's efficiency and reliability. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a transformer that can reduce the amount of material used in the core and facilitate heat dissipation of the windings.

[0004] This utility model also proposes a household appliance having the above-mentioned transformer.

[0005] A transformer according to a first aspect of the present invention includes: an iron core, comprising an upper yoke, a first side yoke, a lower yoke, and a second side yoke connected sequentially from end to end; At least one primary winding is sleeved on at least one of the first side yoke and the second side yoke; At least one secondary winding is sleeved on at least one of the first side yoke and the second side yoke and is spaced apart from the primary winding; At least one magnetic leakage sheet is disposed between the primary winding and the secondary winding and connected to the iron core.

[0006] The transformer according to the embodiments of the present invention has at least the following beneficial effects: By eliminating the center column in the structural design, the amount of material used in the core can be effectively reduced, which is beneficial for the miniaturization, weight reduction, and cost reduction of the transformer. Compared with the EI-shaped core arrangement, placing the primary and secondary windings on the first or second side yoke provides them with more heat dissipation space, improving the overall heat dissipation of the transformer, effectively reducing the operating temperature rise, and thus enhancing the reliability and service life of the transformer.

[0007] According to some embodiments of the present invention, each of the primary winding and the secondary winding is provided, the primary winding is sleeved on the first side yoke, the secondary winding is sleeved on the second side yoke, and the magnetic leakage sheet extends along the upper yoke toward the lower yoke.

[0008] According to some embodiments of the present invention, the secondary winding includes a high-voltage winding and a filament winding, wherein the filament winding is located on the side of the high-voltage winding facing the lower yoke and is spaced apart from the high-voltage winding.

[0009] According to some embodiments of this utility model, there are two primary windings and two secondary windings. The two primary windings are respectively a first primary winding and a second primary winding, and the two secondary windings are respectively a first secondary winding and a second secondary winding. The first primary winding and the first secondary winding are respectively sleeved on the first side yoke, and the second primary winding and the second secondary winding are respectively sleeved on the second side yoke. The magnetic leakage sheet is located between the first primary winding and the first secondary winding.

[0010] According to some embodiments of the present invention, the first primary winding is located on the side of the first secondary winding facing the lower yoke, and the second primary winding is located on the side of the second secondary winding facing the lower yoke.

[0011] According to some embodiments of the present invention, each of the primary winding and the secondary winding is provided, the primary winding is sleeved on the first side yoke, and the secondary winding is sleeved on the first side yoke.

[0012] According to some embodiments of the present invention, the primary winding is located on the side of the secondary winding facing the lower yoke, and the leakage magnetic sheet is located between the primary winding and the secondary winding, and between the first side yoke and the second side yoke.

[0013] According to some embodiments of this utility model, each of the primary winding and the secondary winding is provided. The secondary winding includes a high-voltage winding and a filament winding. The primary winding is sleeved on the first side yoke. The high-voltage winding is sleeved on the primary winding and spaced apart from the primary winding. The filament winding is sleeved on the first side yoke and located on the side of the high-voltage winding facing the upper yoke or the lower yoke. The leakage magnetic sheet is provided between the primary winding and the high-voltage winding.

[0014] According to some embodiments of the present invention, two magnetic leakage plates are provided, one of which is located between the first yoke and the second yoke, and the other is located on the side of the first yoke away from the second yoke.

[0015] The household appliance according to a second aspect of the present invention includes the transformer described in the above embodiment.

[0016] The household appliances according to the embodiments of this utility model have at least the following beneficial effects: By adopting the transformer of the first embodiment, the elimination of the center column in the transformer's structural design effectively reduces the amount of core material used, which is beneficial for the miniaturization, weight reduction, and cost reduction of the transformer. Compared with the EI-shaped core arrangement, arranging the primary and secondary windings on the first or second side yoke provides the primary and secondary windings with greater heat dissipation space, improving the overall heat dissipation effect of the transformer, effectively reducing the operating temperature rise of the transformer, thereby enhancing the transformer's reliability and service life.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the transformer according to the first embodiment of this utility model; Figure 2 This is a front view of the transformer according to the first embodiment of this utility model; Figure 3 This is a schematic diagram of the transformer structure according to the second embodiment of this utility model; Figure 4 This is a front view of the transformer according to the second embodiment of this utility model; Figure 5 This is a schematic diagram of the transformer structure according to the third embodiment of this utility model; Figure 6 This is a front view of the transformer according to the third embodiment of this utility model; Figure 7 This is a schematic diagram of the transformer structure according to the fourth embodiment of this utility model; Figure 8 This is a front view of the transformer according to the fourth embodiment of this utility model; Figure 9 yes Figure 8 Sectional view at point AA; Figure 10 This is a top view of the transformer according to the first embodiment of this utility model; Figure 11 yes Figure 10 Sectional view at point BB; Figure label: Transformer 1000; Iron core 100; upper yoke 110; first side yoke 120; lower yoke 130; second side yoke 140; Primary winding 200; First primary winding 210; Second primary winding 220; Secondary winding 300; high voltage winding 310; filament winding 320; insulation layer 330; first and second secondary windings 340; second and third secondary windings 350; 400mm magnetic leakage sheet. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0022] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0023] In related technologies, high-voltage transformers with leakage inductance used in household appliances such as microwave ovens typically employ an EI-shaped core structure, where the primary and secondary windings are stacked together on the central column of the core. This structure results in lower magnetic flux density in areas such as the side yokes of the core, material redundancy, and increased core usage and manufacturing costs. Simultaneously, the windings are completely enclosed by the core, making heat accumulation difficult and leading to excessively high transformer temperatures, which affects equipment reliability and lifespan.

[0024] To solve the above problems, refer to Figure 1 and Figure 2 As shown in the embodiment of this utility model, the transformer 1000 includes an iron core 100, at least one primary winding 200, at least one secondary winding 300, and at least one magnetic leakage sheet 400. The iron core 100 includes four yokes, namely an upper yoke 110, a first side yoke 120, a lower yoke 130, and a second side yoke 140 connected end to end; at least one primary winding 200 is sleeved on at least one of the first side yoke 120 and the second side yoke 140; at least one secondary winding 300 is sleeved on at least one of the first side yoke 120 and the second side yoke 140 and is spaced apart from the primary winding 200; at least one magnetic leakage sheet 400 is disposed between the primary winding 200 and the secondary winding 300 and is connected to the iron core 100.

[0025] For example, the transformer 1000 in this embodiment is a leakage inductance high-voltage transformer used in a microwave oven. The transformer 1000 has two core functions: first, to boost the voltage, raising the household 220V AC power to approximately 2000V, the high voltage required for the magnetron (the core heating element of the microwave oven) to operate; second, to achieve current limiting and voltage regulation, providing a stable and limited operating current to the magnetron through its special "leakage inductance" design. The primary winding 200 serves as the input terminal of the transformer 1000 and is connected to the household 220V AC power supply. After being energized, the primary winding 200 generates an alternating magnetic field in the iron core 100, which is the energy source for the transformer 1000's operation. The secondary winding 300 includes a high-voltage winding 310 and a filament winding 320. The high-voltage winding 310 has a large number of turns; according to the principle of electromagnetic induction, the high-voltage winding 310 can induce approximately 2000V of high-voltage AC power, supplying the anode of the magnetron and providing energy for microwave generation. The filament winding 320 is a secondary winding with very few turns. The filament winding 320 induces a low voltage of 3-4V, which is used to heat the cathode of the magnetron. The filament can only emit electrons after it is heated, which is a prerequisite for the magnetron to work.

[0026] The leakage magnetic strip 400 is the core component for achieving the "leakage inductance" function. The leakage magnetic strip 400 is made of stacked silicon steel sheets and is placed between the primary winding 200 and the secondary winding 300. The function of the leakage magnetic strip 400 is to provide a "shortcut" or "bypass" for the magnetic flux generated by the primary winding 200. When the primary winding 200 generates a magnetic field, most of the magnetic field passes through the secondary winding 300 along the bypass loop; this part is the "main magnetic flux." However, due to the presence of the leakage magnetic strip 400, a portion of the magnetic field "takes a shortcut," returning directly through the leakage magnetic strip 400 without passing through the secondary winding 300. This "leaked" magnetic field is the leakage magnetic flux. It is this leakage magnetic flux that constitutes the high leakage inductance of the transformer 1000, achieving the aforementioned current limiting and voltage stabilization functions.

[0027] Because magnetrons are easily affected by current, their equivalent resistance changes drastically during startup and operation. Without current limiting, a huge current would instantly burn out the magnetron. Due to the presence of the leakage flux 400, the transformer 1000 can utilize its high leakage inductance to act as an inductor in series in the circuit. When the magnetron attempts to draw excessive current, this "equivalent inductance" generates a reverse voltage, thus limiting the current to a safe range and serving as a current limiter. Simultaneously, when the mains voltage fluctuates, because the core 100 operates in a deep magnetic saturation state, combined with the leakage inductance, the power output to the magnetron remains relatively stable, thus serving as a voltage regulator.

[0028] In this embodiment, the core 100, by eliminating the central column, effectively reduces the material usage, which is beneficial for the miniaturization, weight reduction, and cost reduction of the transformer 1000. Compared to the arrangement of the EI-shaped core 100, arranging the primary winding 200 and secondary winding 300 on the first yoke 120 or the second yoke 140 provides greater heat dissipation space for the primary winding 200 and secondary winding 300, improving the overall heat dissipation effect of the transformer 1000, effectively reducing the operating temperature rise of the transformer 1000, thereby enhancing the reliability and service life of the transformer 1000.

[0029] Reference Figure 1 and Figure 2 As shown in the embodiment of this utility model, a primary winding 200 and a secondary winding 300 are each provided. The primary winding 200 is sleeved on the first yoke 120, and the secondary winding 300 is sleeved on the second yoke 140. The magnetic leakage sheet 400 extends along the upper yoke 110 toward the lower yoke 130. For example, with... Figure 2 Taking the direction in the middle as an example, the magnetic leakage sheet 400 is arranged to extend in the vertical direction.

[0030] With the above scheme, the primary winding 200 and the secondary winding 300 are respectively arranged on two independent first yokes 120 and second yokes 140, increasing the heat dissipation area of ​​the primary winding 200 and the secondary winding 300. Because the outer surfaces of the primary winding 200 and the secondary winding 300 are directly exposed to the air, rather than being wrapped by another winding or yoke, the heat dissipation conditions are improved, effectively reducing the temperature rise of the transformer 1000 during operation. At the same time, the magnetic flux forms a single, continuous loop, flowing sequentially through the first yoke 120, the upper yoke 110, the second yoke 140, and the lower yoke 130, which can improve the uniformity of the magnetic flux density on the magnetic circuit, and can use less core material 100 to carry the same amount of total magnetic flux, thereby reducing weight and volume while meeting power requirements.

[0031] Reference Figure 2As shown in the embodiment of this utility model, the secondary winding 300 includes a high-voltage winding 310 and a filament winding 320. The filament winding 320 is located on the side of the high-voltage winding 310 facing the lower yoke 130 and is spaced apart from the high-voltage winding 310. For example, the filament winding 320 is located below the high-voltage winding 310. The high-voltage winding 310 is the winding used to generate high-voltage output, and its function is to convert the electrical energy of the primary winding 200 into high-voltage electrical energy output. The high-voltage winding 310 has an extremely fine wire diameter and a large number of turns. The filament winding 320 is the winding that supplies power to the magnetron filament. The filament winding 320 has a thick wire diameter and a small number of turns. The spaced-apart arrangement means that an air gap is formed between the high-voltage winding 310 and the filament winding 320 and filled with an insulating dielectric layer. This can be achieved using an epoxy resin spacer or a ceramic gasket. Because the potential difference between the high-voltage winding 310 and the filament winding 320 is large, for example, it can reach 4000V, an insulating medium needs to be filled between them in order to avoid breakdown and burn out the transformer 1000.

[0032] For example, the secondary winding 300 mounted on the second yoke 140 is divided into two independent parts: a high-voltage winding 310 and a filament winding 320. Since the high-voltage winding 310 generates significantly more heat than the filament winding 320, the high-voltage winding 310 is positioned close to the upper yoke 110, while the filament winding 320 is located directly below it and spaced apart. When the high-voltage winding 310 operates, the heat generated diffuses upwards towards the upper yoke 110 through the air gap, reducing the continuous heating of the filament winding 320. Meanwhile, the heat from the filament winding 320 can be conducted outwards through the lower yoke 130 region, facilitating heat dissipation.

[0033] In this embodiment, by independently positioning the filament winding 320 below the high-voltage winding 310, not only is the filament lead length shortened, but the open space in the lower yoke 130 region also enhances heat dissipation. This effectively reduces the overall temperature rise of the secondary winding 300 and prevents thermal coupling between the high-voltage winding 310 and the filament winding 320. The arrangement of the filament winding 320 close to the lower yoke 130 facilitates rapid heat dissipation, improving the operational reliability of the transformer 1000 in high-temperature environments.

[0034] Reference Figure 3 and Figure 4As shown in the embodiment of this utility model, there are two sets of primary winding 200 and two sets of secondary winding 300. The two sets of primary winding 200 are the first primary winding 210 and the second primary winding 220, respectively. The two sets of secondary winding 300 are the first secondary winding 340 and the second secondary winding 350, respectively. The first primary winding 210 and the first secondary winding 340 are respectively sleeved on the first yoke 120, and the second primary winding 220 and the second secondary winding 350 are respectively sleeved on the second yoke 140. The magnetic leakage sheet 400 is located between the first primary winding 210 and the first secondary winding 340, and between the second primary winding 220 and the second secondary winding 350.

[0035] For example, the first yoke 120 and the second yoke 140 each independently carry a primary winding 200 and a secondary winding 300, forming a symmetrical spatial arrangement. A magnetic leakage sheet 400 is arranged in the gap between the primary winding 200 and the secondary winding 300 of the same yoke, reducing magnetic flux density fluctuations in the main magnetic circuit through magnetic circuit shunting. Since the two windings are installed on the two side yokes respectively, the magnetic flux distribution of the core 100 is homogenized, and the utilization rate of the magnetic material in the regions of the first yoke 120 and the second yoke 140 is improved.

[0036] This embodiment achieves magnetic balance by distributing the windings to both yokes, forming a symmetrical layout. Since the winding structures and generated magnetic fields on the first yoke 120 and the second yoke 140 are completely symmetrical, the electromagnetic forces they generate during operation cancel each other out. This reduces the vibration of the core 100 caused by magnetic field imbalance, lowers the operating noise of the transformer 1000, and improves the overall user experience of the microwave oven. Simultaneously, heat dissipation efficiency and uniformity are optimized. The windings, as heat sources, are evenly distributed on the first yoke 120 and the second yoke 140, rather than concentrated in one place. This allows heat to dissipate over a larger surface area, avoiding localized overheating and resulting in a more uniform temperature distribution throughout the transformer 1000. This reduces the overall operating temperature rise and helps improve the long-term reliability and service life of the transformer 1000.

[0037] Reference Figure 4 As shown in the embodiment of this utility model, the first primary winding 210 is located on the side of the first secondary winding 340 facing the lower yoke 130, and the second primary winding 220 is located on the side of the second secondary winding 350 facing the lower yoke 130. The first primary winding 210 and the second primary winding 220 are respectively arranged on the side of the first secondary winding 340 and the second secondary winding 350 facing the lower yoke 130, so that the magnetic flux generated by the primary winding 200 preferentially forms a closed loop through the lower yoke 130, reducing the diffusion path of the magnetic flux in the side yoke region, making the magnetic flux density of the core 100 tend to be balanced in the side yoke region, and reducing the cross-sectional area redundancy of the core 100.

[0038] Reference Figure 5 and Figure 6 As shown in the embodiment of this utility model, a primary winding 200 and a secondary winding 300 are each provided. The primary winding 200 is sleeved on the first yoke 120, and the secondary winding 300 is sleeved on the first yoke 120. The primary winding 200 is located on the side of the secondary winding 300 facing the lower yoke 130. The magnetic leakage sheet 400 is located between the primary winding 200 and the secondary winding 300, and between the first yoke 120 and the second yoke 140. The magnetic leakage sheet 400 extends horizontally.

[0039] For example, the primary winding 200, filament winding 320, and high-voltage winding 310 are arranged on the same first yoke 120 of the core 100. When alternating current is applied to the primary winding 200, alternating magnetic flux is generated in the core 100. The main magnetic flux passes sequentially along the first yoke 120 through the filament winding 320 and the high-voltage winding 310, and forms a complete circuit through other yokes of the core 100, thereby inducing the required voltage on the secondary side. Unlike the first embodiment described above, the leakage magnetic sheet 400 here is horizontally inserted between the primary winding 200 and the secondary winding 300, creating a magnetic shunt between the two yokes of the core 100. Therefore, a portion of the magnetic flux generated by the primary winding 200 will choose this "shortcut," flowing directly through the leakage magnetic sheet 400 to the opposite yoke, instead of passing upwards through the secondary winding 300. This structured and controllable leakage flux path accurately constructs the leakage inductance characteristics required by the transformer 1000, which is used to achieve current limiting and voltage regulation protection for the magnetron.

[0040] In this embodiment, by concentrating the primary winding 200 and secondary winding 300 on the first side yoke 120, the overall structure of the transformer 1000 becomes more compact, which helps to reduce the external size and space occupied by the transformer 1000, adapting to the design trend of microwave oven miniaturization. Simultaneously, the structure of horizontally inserting the leakage magnetic sheet 400 between the primary and secondary windings 300 allows for more direct control of the leakage inductance. By adjusting the thickness, insertion depth, or material of the leakage magnetic sheet 400, the magnitude of the leakage flux can be easily changed, thereby precisely "customizing" the current limiting and voltage regulation characteristics of the transformer 1000 to match the operating requirements of different magnetron models.

[0041] Reference Figure 7 , Figure 8 and Figure 9As shown in the embodiment of this utility model, a primary winding 200 and a secondary winding 300 are each provided. The secondary winding 300 includes a high-voltage winding 310 and a filament winding 320. The primary winding 200 is sleeved on the first yoke 120. The high-voltage winding 310 is sleeved on the primary winding 200 and spaced apart from it. The filament winding 320 is sleeved on the first yoke 120 and located on the side of the high-voltage winding 310 facing the upper yoke 110 or the lower yoke 130. A magnetic leakage sheet 400 is provided between the primary winding 200 and the high-voltage winding 310. Two magnetic leakage sheets 400 are provided, one of which is located between the first yoke 120 and the second yoke 140, and the other is located on the side of the first yoke 120 away from the second yoke 140. An insulating layer 330 is also sleeved on the outer side of the high-voltage winding 310.

[0042] For example, using a coaxial winding structure, the primary winding 200, high-voltage winding 310, and filament winding 320 are all wound together on the same first yoke 120 of the UI-shaped iron core 100. The primary winding 200 is in the innermost layer, close to the first yoke 120; the high-voltage winding 310 is wound outside the primary winding 200; and the filament winding 320 is at the upper end of the primary winding 200 and the high-voltage winding 310. The leakage magnetic sheet 400 is vertically inserted between the primary winding 200 and the high-voltage winding 310, parallel to the yoke of the iron core 100. When the primary winding 200 is energized, the generated main magnetic flux passes through both the inner primary winding 200 and the outer secondary winding 300 simultaneously, achieving voltage boost. Meanwhile, due to the presence of the built-in leakage magnetic sheet 400, it provides a local magnetic circuit that bypasses the secondary winding 300 for the magnetic flux generated by the primary winding 200. This part of the leakage magnetic flux is effectively guided and enhanced, thereby forming a stable and sufficiently large leakage inductance to achieve the current limiting and voltage regulation functions of the magnetron.

[0043] By arranging all the primary windings 200 and high-voltage windings 310 concentrically and embedding the leakage magnetic sheet 400 within them, the transformer 1000 achieves a compact structure and reduced radial dimensions, facilitating installation within the limited internal space of a microwave oven. Secondly, the nested winding method naturally creates a good insulation structure. The primary winding 200 is located in the innermost layer, close to the grounded core 100, while the high-voltage winding 310 is on the outside, separated by an insulation structure and the leakage magnetic sheet 400. Furthermore, an insulation layer 330 is also arranged on the outer side of the high-voltage winding 310. This arrangement facilitates reliable electrical isolation between high and low voltages, providing excellent insulation performance and high safety. Simultaneously, it helps dissipate heat from the high-voltage winding 310, which generates significant heat, reducing the temperature rise of the transformer 1000.

[0044] Reference Figure 9 , Figure 10 and Figure 11As shown in the embodiment of this utility model, two magnetic leakage plates 400 are provided. One magnetic leakage plate 400 is located between the first side yoke 120 and the second side yoke 140, and the other magnetic leakage plate 400 is located on the side of the first side yoke 120 opposite to the second side yoke 140. Both magnetic leakage plates 400 extend vertically. By designing the two magnetic leakage plates 400 to be arranged at different positions in the core 100, the leakage flux between the primary winding 200 and the secondary winding 300 is guided in segments. A parallel magnetic circuit is formed by the magnetic leakage plates 400 on both sides of the first side yoke 120, thereby reducing the fluctuation of magnetic flux density in the main magnetic circuit of the core 100. The magnetic leakage plates 400 are fixed to the core 100 by welding or riveting, and their height and width are matched to the size of the core 100 according to the magnetic flux adjustment requirements.

[0045] Through the above technical solution, this embodiment can optimize the magnetic flux distribution in the main magnetic circuit and the outer region of the side yoke of the core 100. While reducing the overall volume of the core 100, the extended heat dissipation surface formed by the leakage magnetic sheet 400 accelerates the heat dissipation of the winding, thereby achieving a dual improvement in material cost and heat dissipation performance.

[0046] This utility model discloses a method for designing the dimensions of the leakage magnetic sheet 400 of a transformer 1000 according to an embodiment of the present invention. The transformer 1000 is the same as the transformer 1000 described in the above embodiment. The dimension design method includes: Calculate the cross-sectional area S of core 100. c ,satisfy:

[0047] Among them, P eff PF is the effective value of the output power of transformer 1000, in W; PF is the power factor of transformer 1000, ranging from 0.85 to 0.9. Calculate the number of turns N1 of the primary winding 200 and the number of turns N2 of the high-voltage winding 310, satisfying:

[0048]

[0049] Where f is the operating frequency of transformer 1000 in Hz, B0 is the operating magnetic flux density of transformer 1000, and U 1n The rated effective voltage of the primary winding is 200V, in units of V and U. 20n This is the effective value of the rated no-load voltage of the high-voltage winding 310, in V; Calculate the primary magnetic flux Φ1 generated by the primary winding 200 and the secondary magnetic flux Φ2 generated by the high-voltage winding 310, satisfying:

[0050]

[0051] Calculate the cross-sectional area of ​​the magnetic leakage sheet 400. S σ ,satisfy:

[0052] Where, k σ The cross-sectional coefficient of the 400mm magnetic leakage sheet ranges from 0.75 to 0.8. Calculate the width d of the magnetic leakage sheet 400. σ and height h σ ,like Figure 2 As shown, when the magnetic leakage sheet 400 is arranged vertically, the following conditions are met:

[0053]

[0054] Among them, h w The shortest distance between the upper yoke and the lower yoke; like Figure 4 As shown, when the magnetic leakage sheet 400 is arranged in a horizontal direction, the following conditions are met:

[0055]

[0056] Where, d w It is the shortest distance between the first parayoke and the second parayoke.

[0057] The calculation of the cross-sectional area of ​​core 100 incorporates the power factor, avoiding the dimensional redundancy of core 100 caused by neglecting the power factor in traditional methods. The calculation of the number of winding turns is based on the dynamic balance between operating frequency and magnetic flux density, preventing magnetic circuit saturation or material waste. The determination of the cross-sectional area of ​​the leakage flux sheet 400 is achieved by quantifying the magnetic flux difference, precisely controlling the cross-sectional area of ​​the leakage flux path, thereby reducing the inefficient magnetic flux distribution in the side yoke region of core 100. The design of the lamination width and height is combined with the structural parameters of core 100. For example, when the laminations are arranged vertically, the height is determined by the spacing between the upper yoke 110 and the lower yoke 130, and the width is automatically adapted by the ratio of cross-sectional area to height, ensuring the matching of the leakage flux channel and the winding heat dissipation gap.

[0058] This utility model discloses a household appliance according to one embodiment, including the transformer 1000 described in the above embodiment. The appliance can be a microwave oven, a household sterilizer, a dish sterilizer, an air purifier, a water purifier, etc. The household appliance of this utility model uses the transformer 1000 described in the above embodiment. By eliminating the central column in the core 100 structure, the material usage of the core 100 can be effectively reduced, which is beneficial for the miniaturization, weight reduction, and cost reduction of the transformer 1000. Compared to the arrangement of the EI-shaped core 100, arranging the primary winding 200 and the secondary winding 300 on the first side yoke 120 or the second side yoke 140 provides greater heat dissipation space for the primary winding 200 and the secondary winding 300, improving the overall heat dissipation effect of the transformer 1000, effectively reducing the operating temperature rise of the transformer 1000, thereby improving the reliability and service life of the transformer 1000.

[0059] Since the household appliances adopt all the technical solutions of the transformer 1000 in the above embodiments, they have at least all the beneficial effects brought about by the technical solutions in the above embodiments, which will not be repeated here.

[0060] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A transformer, characterized in that, include: The iron core consists of the upper yoke, the first side yoke, the lower yoke, and the second side yoke, which are connected end to end. At least one primary winding is sleeved on at least one of the first side yoke and the second side yoke; At least one secondary winding is sleeved on at least one of the first side yoke and the second side yoke and is spaced apart from the primary winding; At least one magnetic leakage sheet is disposed between the primary winding and the secondary winding and connected to the iron core.

2. The transformer according to claim 1, characterized in that: Each of the primary winding and the secondary winding is provided. The primary winding is sleeved on the first side yoke, and the secondary winding is sleeved on the second side yoke. The magnetic leakage sheet extends along the upper yoke toward the lower yoke.

3. The transformer according to claim 2, characterized in that: The secondary winding includes a high-voltage winding and a filament winding. The filament winding is located on the side of the high-voltage winding facing the lower yoke and is spaced apart from the high-voltage winding.

4. The transformer according to claim 1, characterized in that: There are two primary windings and two secondary windings. The two primary windings are a first primary winding and a second primary winding, and the two secondary windings are a first secondary winding and a second secondary winding. The first primary winding and the first secondary winding are respectively sleeved on the first side yoke, and the second primary winding and the second secondary winding are respectively sleeved on the second side yoke. The magnetic leakage sheet is located between the first primary winding and the first secondary winding.

5. The transformer according to claim 4, characterized in that: The first primary winding is located on the side of the first secondary winding facing the lower yoke, and the second primary winding is located on the side of the second secondary winding facing the lower yoke.

6. The transformer according to claim 1, characterized in that: Each of the primary winding and the secondary winding is provided, with the primary winding sleeved on the first side yoke and the secondary winding sleeved on the first side yoke.

7. The transformer according to claim 6, characterized in that: The primary winding is located on the side of the secondary winding facing the lower yoke, and the leakage magnetic sheet is located between the primary winding and the secondary winding, and between the first side yoke and the second side yoke.

8. The transformer according to claim 1, characterized in that: Each of the primary winding and the secondary winding is provided. The secondary winding includes a high-voltage winding and a filament winding. The primary winding is sleeved on the first side yoke. The high-voltage winding is sleeved on the primary winding and spaced apart from the primary winding. The filament winding is sleeved on the first side yoke and located on the side of the high-voltage winding facing the upper yoke or the lower yoke. The leakage magnetic sheet is provided between the primary winding and the high-voltage winding.

9. The transformer according to claim 8, characterized in that: The magnetic leakage sheet is provided in two parts, one of which is located between the first side yoke and the second side yoke, and the other of which is located on the side of the first side yoke away from the second side yoke.

10. A household appliance, characterized in that: The transformer includes any one of claims 1 to 9.

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