CN112271065A - High-power high-voltage high-frequency transformer - Google Patents
High-power high-voltage high-frequency transformer Download PDFInfo
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- CN112271065A CN112271065A CN202011106620.5A CN202011106620A CN112271065A CN 112271065 A CN112271065 A CN 112271065A CN 202011106620 A CN202011106620 A CN 202011106620A CN 112271065 A CN112271065 A CN 112271065A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/02—Casings
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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Abstract
The invention provides a high-power high-voltage high-frequency transformer, comprising: an insulating spacer; the primary winding and the secondary winding are respectively arranged on two sides of the insulating partition plate, the primary winding and the secondary winding are spirally wound according to a plane to form a wire cake, and an inner hole is formed in the center of the wire cake; the primary and secondary side magnetic cores are arranged in the inner holes of the primary and secondary side windings; the primary side magnetic core is fixed in the primary side shielding case, the secondary side magnetic core is fixed in the secondary side shielding case, and the primary side shielding case and the secondary side shielding case enable the whole high-power high-voltage high-frequency transformer to be in a flat shape. Therefore, the transformer is in an ultrathin flat shape, so that the thermal resistance can be reduced, the withstand voltage and creepage distance can be ensured, the insulating material can be saved, in addition, due to the flat shape, the shielding covers on the two sides are close to each other, the plane is larger, the uniformity of the internal electric field is better, the non-local discharge can be realized, in addition, the insulating plate is arranged between the primary side winding and the secondary side winding, the primary side winding and the secondary side winding of the transformer can be completely isolated, and the high-voltage isolation is realized.
Description
Technical Field
The invention relates to the technical field of transformers, in particular to a high-power high-voltage high-frequency transformer.
Background
With the progress of new energy technology, various power electronic energy conversion devices are continuously emerging. In a power electronic energy conversion device, a high-voltage high-frequency transformer is an indispensable important component.
However, in the related art, the high-power high-voltage high-frequency transformer has the following technical problems:
1. the size and the volume are large, and the magnetic core coil structure of the traditional transformer is adopted, so that the length, the width and the height of the three sizes are approximately in the same order of magnitude.
2. When the high-power high-voltage high-frequency transformer is large in length, width and height, the heat resistance of an outward conduction path of heat inside the transformer is large, and internal temperature rise is caused to be overhigh. In order to obtain reasonable temperature rise, the material consumption of the magnetic core and the coil is increased to obtain lower loss, so that the cost is increased; or additional cooling devices are added, the complexity of the system is increased, the operational reliability is reduced, and the cost is increased inevitably.
3. When the insulating material is applied to 10KV-35KV isolation voltage, the insulating thickness and the creepage distance are main factors for determining the shape and the size of the transformer, and then the magnetic circuit, the winding, the lead terminal, the grounding fastener and the like of the transformer need to increase the insulating and creepage distance in all directions, so that the volume of the high-voltage high-frequency transformer in high-voltage application is remarkably increased. Meanwhile, the shape of the high-voltage and low-voltage part inside the transformer is complex and the voltage is high, so that a strong local electric field is easily formed to cause discharge, which is determined by the structure of the magnetic circuit coil of the traditional transformer. Therefore, the withstand voltage and the partial discharge amount of the high-voltage high-frequency transformer in the related art are extremely difficult to control, and particularly, the partial discharge index is a key factor influencing the power density of the high-voltage isolation high-frequency transformer. In order to solve the problems, the insulation thickness and the creepage distance are usually additionally increased, so that the transformer is large in size, high in material consumption, large in loss, not beneficial to heat dissipation and overhigh in temperature rise;
4. the primary and secondary windings and the magnetic core are mutually wound together, and the isolation grade is not high.
Disclosure of Invention
The invention provides a high-power high-voltage high-frequency transformer, which aims to solve the technical problems and enables the transformer to be in an ultrathin flat shape, thereby reducing thermal resistance, ensuring withstand voltage and creepage distance, saving insulating materials, obviously reducing the weight of the transformer and saving cost.
The technical scheme adopted by the invention is as follows:
a high power, high voltage, high frequency transformer comprising: an insulating spacer; the primary winding and the secondary winding are respectively arranged on two sides of the insulating partition plate, the primary winding and the secondary winding are spirally wound according to a plane to form a wire cake, and an inner hole is formed in the center of the wire cake; the primary side magnetic core is arranged in an inner hole of the primary side winding, and the secondary side magnetic core is arranged in an inner hole of the secondary side winding; the high-power high-voltage high-frequency transformer comprises a primary side shielding cover and a secondary side shielding cover, wherein a primary side magnetic core is fixed in the primary side shielding cover, a secondary side magnetic core is fixed in the secondary side shielding cover, and the primary side shielding cover and the secondary side shielding cover enable the whole high-power high-voltage high-frequency transformer to be in a flat shape.
According to the high-power high-voltage high-frequency transformer, the primary winding and the secondary winding are respectively arranged on two sides of the insulating partition plate, the primary winding and the secondary winding are spirally wound according to a plane to form a wire cake, an inner hole is formed in the center of the wire cake, the primary magnetic core is arranged in the inner hole of the primary winding, the secondary magnetic core is arranged in the inner hole of the secondary winding, the primary magnetic core is fixed in the primary shielding case, the secondary magnetic core is fixed in the secondary shielding case, and the primary shielding case and the secondary shielding case enable the whole high-power high-voltage high-frequency transformer to be in a flat shape. Therefore, the transformer is made to be in an ultrathin flat shape by utilizing the winding in a special shape, the thickness of the outward conduction direction of internal heat is smaller, the heat dissipation area is larger, the thermal resistance can be reduced, the withstand voltage and the creepage distance can be ensured by changing the thickness of the insulating partition plate, the space in each direction for insulation is reduced, the insulating material is greatly saved, the whole weight of the transformer is obviously reduced, the power density is improved, the cost is also saved, in addition, due to the flat shape, the distance between the shielding covers at two sides is closer, the plane is larger, the uniformity of the internal electric field is better, the distortion of the internal electric field can be reduced, the corona onset voltage is reduced, the occurrence of partial discharge is effectively inhibited, no partial discharge can be realized, the insulating plate is arranged between the primary side winding and the secondary side winding, the primary side and the secondary side of the transformer can be completely.
The high-power high-voltage high-frequency transformer provided by the invention can also have the following accessory technical characteristics:
specifically, the material, shape size identical of primary side magnetic core and vice limit magnetic core, wherein, primary side magnetic core with vice limit magnetic core includes: the magnetic circuit comprises a core column, a plurality of magnetic yokes and a pole shoe, wherein the core column and the plurality of magnetic yokes form an annular groove for placing the primary winding or the secondary winding, the core column and the pole shoe are aligned in opposite directions to form a magnetic circuit, and the plurality of magnetic yokes are hollowed out.
Specifically, the stem is formed by connecting a cylinder and a regular polygon cylinder, and the cylinder is arranged in the inner hole.
Furthermore, the regular polygon cylinder of the core column is connected with the plurality of magnetic yokes outwards, the magnetic yokes are arranged in a radial radiation mode and equally divide the whole circumference, and the end parts of the magnetic yokes are connected with the pole shoes.
Specifically, the primary side shielding case and the secondary side shielding case comprise filling holes, filling process holes and lead holes, and the filling holes are used for vacuum filling of heat-conducting insulating pouring sealant into an inner cavity of a filling mold when the high-power high-voltage high-frequency transformer is filled and sealed by the filling mold; the encapsulation process hole is used for exhausting air and removing redundant colloid after encapsulation is finished; the lead wire hole is used for leading out lead wires of the primary winding and the secondary winding.
Specifically, the insulating spacer includes: the umbrella skirt is arranged on the part of the insulating partition plate, which is exposed out of the primary side shielding case and the secondary side shielding case.
The invention has the beneficial effects that:
the transformer is in an ultrathin flat shape, the thickness of the internal heat in the outward conduction direction is smaller, the heat dissipation area is larger, the thermal resistance can be reduced, the withstand voltage and the creepage distance can be ensured by changing the thickness of the insulating partition plate, the space in each direction for insulation is reduced, the insulating material is greatly saved, the whole weight of the transformer is obviously reduced, the power density is improved, and the cost is also saved.
Drawings
FIG. 1 is a side sectional view of a high power, high voltage, high frequency transformer in accordance with one embodiment of the present invention;
FIG. 2 is a schematic winding diagram of the primary winding and the secondary winding of one embodiment of the present invention;
FIG. 3 is a side sectional view of a high power, high voltage, high frequency transformer according to another embodiment of the present invention;
FIG. 4 is a schematic view of an insulating spacer according to one embodiment of the present invention;
FIG. 5 is a schematic view of a 2-leg core configuration according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of a 4-leg core configuration according to one embodiment of the present invention;
FIG. 7 is a schematic diagram of a 6-leg core configuration according to one embodiment of the present invention;
FIG. 8 is a schematic diagram of an 8-leg core configuration according to one embodiment of the present invention;
fig. 9 is a schematic structural view of a front four-sided stem of one embodiment of the present invention;
fig. 10 is a schematic structural view of a regular hexagonal stem of one embodiment of the present invention;
figure 11 is a schematic diagram of the primary and secondary side shields of one embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a side sectional view of a high power, high voltage, high frequency transformer in accordance with one embodiment of the present invention. As shown in fig. 1, the high power, high voltage, and high frequency transformer includes: the transformer comprises an insulating partition plate 1, a primary winding 2, a secondary winding 3, a primary magnetic core 4, a secondary magnetic core 5, a primary shielding case 6 and a secondary shielding case 7.
The primary winding 2 and the secondary winding 3 are respectively arranged on two sides of the insulating partition board 1, as shown in fig. 2, the primary winding 2 and the secondary winding 3 are spirally wound according to a plane to form a wire cake, and an inner hole is formed in the center of the wire cake. The primary side magnetic core 4 is arranged in an inner hole of the primary side winding 2, and the secondary side magnetic core 5 is arranged in an inner hole 21 of the secondary side winding 3; the primary side magnetic core 4 is fixed in the primary side shielding case 6, the secondary side magnetic core 5 is fixed in the secondary side shielding case 7, and the primary side shielding case 6 and the secondary side shielding case 7 enable the whole high-power high-voltage high-frequency transformer to be in a flat shape.
Specifically, as shown in fig. 1, insulating materials with a temperature resistance higher than the maximum operating temperature of the transformer can be used to manufacture the insulating spacer 1, such as: phenolic resins, epoxy resins, electroceramics, polyimides, polytetrafluoroethylene, polysulfones, and the like. The insulating spacer 1 should be a monolithic piece of material that is dense and uniform, free of internal voids and bubbles, and free of cracks and holes on the surface. The insulating partition board 1 is used for bearing high isolation voltage between the primary side and the secondary side, is used for main insulation between the primary side and the secondary side, and can realize high-voltage isolation of 42kv-75kv between the primary side winding and the secondary side winding. When the material and the manufacturing process of the insulating partition board 1 are determined, the thickness of the central flat plate area is a main determining factor of the isolation withstand voltage between the original secondary side. The insulating separator 1 has another function of: on the premise of meeting the requirement of voltage resistance, the thickness of the middle flat plate area of the insulating partition plate 1 is changed, and the excitation inductance and the leakage inductance of the transformer can be adjusted. The effect of the insulating spacer 1 makes it possible for the transformer proposed by the present invention to adjust the inductance by the thickness of the insulating spacer, in addition to the inductance by the core and coil parameters. The effect of adjusting the inductance by the thickness of the insulating partition board 1 is combined with the effect of adjusting the inductance by the relevant parameters of the magnetic core coil, so that a more flexible inductance adjusting method can be provided, and the inductance adjusting range is effectively enlarged. In various types of power electronic conversion topologies, the leakage inductance and the excitation inductance of an isolation transformer are required to participate in the control process of energy conversion, and when the leakage inductance or the excitation inductance of the transformer cannot meet the requirements of topology conversion, an additional inductance is required. The transformer provided by the invention has a large inductance adjustment range, does not need an external inductor for most applications, and can better realize the magnetic integration of the transformer in a large application range.
In the present invention, the primary winding 2 and the secondary winding 3 are wound using litz wires, and the cross-sectional shape of the litz wires may be circular, square or rectangular. The side length of the cross section of the litz wire is adjusted, and the thickness and the outer contour size of the winding can be adjusted. The primary and secondary windings are wound in a planar spiral to form a coil, as shown in fig. 2, the center of the coil has a region without winding, called a coil inner hole 21, for placing a magnetic core. The wire cake can be wound in a single layer or in a double layer or a multilayer. All the geometries of the primary winding 2 and the secondary winding 3 may be the same or different.
The primary side shielding cover 6 and the secondary side shielding cover 7 are used for electromagnetically shielding the transformer, so that the magnetic field leakage of the transformer is reduced, the electric field inside the transformer tends to be uniform, and the occurrence of partial discharge is effectively inhibited. The primary side shield 6 and the secondary side shield 7 are characterized in that: the conductive, magnetic and heat-conducting properties are all good, and the plate is a thin plate material.
The high-power high-voltage high-frequency transformer utilizes the winding with a special shape to enable the transformer to be in an ultrathin flat shape, the thickness of the internal heat in the outward conduction direction is smaller, the heat dissipation area is larger, the thermal resistance can be reduced, the withstand voltage and the creepage distance can be ensured by changing the thickness of the insulating partition plate, the space in each direction for insulation is reduced, the insulating material is greatly saved, the overall weight of the transformer is obviously reduced, the power density is improved, the cost is also saved, and due to the flat shape, the distance between the shielding covers at two sides is closer, the plane is larger, the uniformity of the internal electric field is better, the distortion of the internal electric field can be reduced, the corona voltage is reduced, the occurrence of partial discharge is effectively inhibited, and no partial discharge can be realized.
According to an embodiment of the present invention, as shown in fig. 3, the insulating spacer 1 may include: and the umbrella skirt 11 is arranged at the part of the insulating partition plate 1, which exposes the primary side shielding case 6 and the secondary side shielding case 7.
Specifically, when the umbrella skirt 11 is arranged around the insulating partition plate 1, the insulating partition plate needs to be obtained by one-step pressing through a mold, and when the umbrella skirt is not arranged around the insulating partition plate, the insulating partition plate can be obtained by pressing through the mold or cutting through an extruded section. The size or umbrella skirt which is more abundant than the original secondary side shielding cover has the function of increasing the surface creepage distance between the original secondary sides and meeting the requirement of corresponding voltage grade on surface flashover. Among them, the insulating spacer 1 can be referred to fig. 4.
According to an embodiment of the present invention, the primary core 4 and the secondary core 5 are made of the same material and have the same shape and size, wherein, as shown in fig. 5 to 8, the primary core 4 and the secondary core 5 comprise: the core column 31, the multiple magnetic yokes 32 and the pole shoes 33, the core column 31 and the multiple magnetic yokes 32 form an annular groove for placing the primary winding 2 or the secondary winding 3, the core column 31 and the pole shoes 33 are aligned in opposite directions to form a magnetic circuit, and the multiple magnetic yokes 32 are hollowed out, so that heat dissipation of an internal winding is facilitated. In fig. 5 to 8, the left side is a sectional view of the magnetic core, and the right side is a side view of the sectional view.
Further, as shown in fig. 5 to 10, the stem 31 is formed by connecting a cylindrical body and a regular polygonal cylindrical body, and the cylindrical body is disposed in the inner hole.
The regular polygonal cylinder of the stem 31 is outwardly connected with a plurality of yokes 32, the plurality of yokes 32 are radially arranged and equally divide the whole circumference, and the end parts of the yokes 32 are connected with pole shoes 33.
Specifically, the magnetic core can be made of any grade of manganese-zinc ferrite soft magnetic material, and can be made of other soft porcelain materials, such as amorphous materials, nanocrystalline materials, metal powder cores and the like. The shape of the magnetic core can be shown in reference to fig. 5-8, and can be in other forms, but the common characteristics are that: the core leg 31 (the area surrounded by the dotted line in the figure) of the magnetic core is formed by connecting a thin cylinder and a thin regular polygonal cylinder, as shown in fig. 9-10. The regular polygonal cylinder of the core column 31 is outwards connected with a plurality of magnetic yokes 32, the magnetic yokes 32 are radially arranged and equally divided into the whole circumference, and the end parts of the magnetic yokes 32 are connected with pole shoes 33; the core columns and all pole shoes of the primary side magnetic core and the secondary side magnetic core are aligned oppositely to form a magnetic circuit (an insulating partition plate is arranged in the middle); the magnetic yokes are in a hollow state, so that heat dissipation of the internal winding is facilitated. The magnetic cores in these shapes can be integrated or spliced and combined. The number of the magnetic yokes is not limited to 2, 4, 6 and 8, and can be any integer greater than 1, including singular magnetic yokes such as 3, 5 and 7.
According to an embodiment of the present invention, as shown in fig. 11, the primary shielding case 6 and the secondary shielding case 7 include a potting hole 61, a potting process hole 62 and a lead hole 63, where the potting hole 61 is used for vacuum-potting a heat-conducting insulating potting adhesive in an inner cavity of a potting mold when the high-power high-voltage high-frequency transformer is potted by using the potting mold; the encapsulation process hole 62 is used for exhausting air and removing redundant colloid after encapsulation is finished; the lead holes 63 are used for leading out leads of the primary winding and the secondary winding.
Specifically, as shown in fig. 3, the high-power, high-voltage and high-frequency transformer further includes: primary side heat conduction casting glue 8, vice limit heat conduction casting glue 9, in the generation technology of high-power high-voltage high-frequency transformer, the reasonable clearance between shield cover and the magnetic core: on the premise of ensuring that the pouring sealant fully flows to fill all the gaps, the gaps are as small as possible. The filling hole 61, the filling process hole 62 and the lead hole 63 may be arranged at the positions shown in fig. 11, or may not be arranged at the positions shown in fig. 11, so that the corresponding requirements can be met.
And fixing the primary side shielding case 6 in the potting mold by using the potting mold, fixing the primary side magnetic core 4 in the primary side shielding case 6, fixing the primary side winding 2 in the primary side magnetic core 4, and leading out a lead from a lead hole 63 of the shielding case and sealing the gap. The sub-shield case 7 is fixed in the potting mold, the sub-core 5 is fixed in the sub-shield case 7, the sub-winding 3 is fixed in the sub-core 5, and the lead wire is led out from the shield case lead hole 63 and the gap is closed by using the potting mold.
Placing an insulating partition plate 1 in the middle of the molds on the two sides, simultaneously using an encapsulating mold to ensure that all pole shoes of the original secondary side magnetic cores are aligned in opposite directions, aligning core columns of the magnetic cores in opposite directions, and then buckling the molds. After the molds on the two sides are buckled, heat-conducting insulating pouring sealant is poured into the inner cavity of the mold in a vacuum mode through the pouring hole 61. After the heat-conducting potting adhesive is cured, the mold is removed, and all parts of the transformer form a whole.
Therefore, the plate type high-voltage isolation high-frequency transformer provided by the invention is very thin, and the whole large plane is a good radiating surface. The power plate of the high-power electronic and the radiator are generally rectangular in shape, one side of the power plate is often a ventilation air duct, and the ideal integral structure is that the front and the back of the air duct are not blocked. Therefore, the flat-plate transformer and the flat-plate power circuit board can be easily combined into a unit device with higher power density, and the radiating plane of the flat-plate transformer and the radiating plane of the power board can be leaned together to form an air channel, so that the flat-plate transformer is very beneficial to the overall structural design of a high-power electronic device, the power density can be improved, and a reasonable radiating air channel can be formed.
The high-power high-voltage high-frequency transformer provided by the invention has the advantages that due to the characteristics of a flat plate structure, the thickness direction of the internal heat conducted outwards is small, the heat dissipation area is large, and the heat resistance is very small. Therefore, the transformer does not need to rely on high consumption materials to reduce the temperature rise, and does not need to additionally add a separate heat dissipation device. Or when the ventilation capacity and the temperature rise requirement of the system are given, the transformer provided by the invention can meet the same temperature rise requirement of the traditional transformer by using less materials. This means that the transformer of the present invention can save material, reduce loss, improve efficiency and reduce cost.
According to the high-power high-voltage high-frequency transformer provided by the invention, the high-voltage side and the low-voltage side are respectively positioned at the two sides of the insulating partition plate through the flat insulating structure, and the voltage resistance and creepage are ensured only by the thickness of the insulating partition plate in all high-voltage insulation problems, so that the space of the traditional transformer structure in all directions for insulation is reduced, the insulating material is greatly saved, the whole weight of the transformer is obviously reduced, the power density is improved, and the cost is also saved.
The high-power high-voltage high-frequency transformer provided by the invention can adjust the inductance by using the parameters of the magnetic core and the coil, and has the possibility of adjusting the inductance by using the thickness of the partition plate. The adjustment effect of the thickness of the insulating partition plate on the inductance is combined with the adjustment effect of the related parameters of the magnetic core coil on the inductance, so that a more flexible inductance adjustment method can be provided, and the adjustment range of the inductance is effectively enlarged. In various types of power electronic conversion topologies, the leakage inductance and the excitation inductance of an isolation transformer are required to participate in the control process of energy conversion, and when the leakage inductance or the excitation inductance of the transformer cannot meet the requirements of topology conversion, an additional inductance is required. The transformer provided by the invention has a large inductance adjustment range, does not need an external inductor for most applications, and can better realize the magnetic integration of the transformer in a large application range.
The high-power high-voltage high-frequency transformer provided by the invention has the advantages that the shape is flat, the shielding covers at two sides are close to each other and have larger planes, the uniformity of an internal electric field is better, the distortion of the internal electric field can be reduced, the corona voltage is reduced, the occurrence of partial discharge is effectively inhibited, and no partial discharge can be realized.
In summary, according to the high-power high-voltage high-frequency transformer of the invention, the primary winding and the secondary winding are respectively arranged on two sides of the insulating partition plate, the primary winding and the secondary winding are spirally wound according to a plane to form a wire cake, the wire cake has an inner hole in the center, the primary magnetic core is arranged in the inner hole of the primary winding, the secondary magnetic core is arranged in the inner hole of the secondary winding, the primary magnetic core is fixed in the primary shielding case, the secondary magnetic core is fixed in the secondary shielding case, and the primary shielding case and the secondary shielding case enable the whole high-power high-voltage high-frequency transformer to be in a flat shape. Therefore, the transformer is made to be in an ultrathin flat shape by utilizing the winding in a special shape, the thickness of the outward conduction direction of internal heat is smaller, the heat dissipation area is larger, the thermal resistance can be reduced, the withstand voltage and the creepage distance can be ensured by changing the thickness of the insulating partition plate, the space in each direction for insulation is reduced, the insulating material is greatly saved, the whole weight of the transformer is obviously reduced, the power density is improved, the cost is also saved, in addition, due to the flat shape, the distance between the shielding covers at two sides is closer, the plane is larger, the uniformity of the internal electric field is better, the distortion of the internal electric field can be reduced, the corona onset voltage is reduced, the occurrence of partial discharge is effectively inhibited, no partial discharge can be realized, the insulating plate is arranged between the primary side winding and the secondary side winding, the primary side and the secondary side of the transformer can be completely.
In the description of the present invention, it is to be understood that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly and include, for example, fixed connections, detachable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (6)
1. A high power, high voltage, high frequency transformer, comprising:
an insulating spacer;
the primary winding and the secondary winding are respectively arranged on two sides of the insulating partition plate, the primary winding and the secondary winding are spirally wound according to a plane to form a wire cake, and an inner hole is formed in the center of the wire cake;
the primary side magnetic core is arranged in an inner hole of the primary side winding, and the secondary side magnetic core is arranged in an inner hole of the secondary side winding;
the high-power high-voltage high-frequency transformer comprises a primary side shielding cover and a secondary side shielding cover, wherein a primary side magnetic core is fixed in the primary side shielding cover, a secondary side magnetic core is fixed in the secondary side shielding cover, and the primary side shielding cover and the secondary side shielding cover enable the whole high-power high-voltage high-frequency transformer to be in a flat shape.
2. The high power, high voltage and high frequency transformer according to claim 1, wherein the primary core and the secondary core are made of the same material, have the same shape and size, and comprise: the magnetic circuit comprises a core column, a plurality of magnetic yokes and a pole shoe, wherein the core column and the plurality of magnetic yokes form an annular groove for placing the primary winding or the secondary winding, the core column and the pole shoe are aligned in opposite directions to form a magnetic circuit, and the plurality of magnetic yokes are hollowed out.
3. The high power, high voltage, high frequency transformer according to claim 2, wherein said core is formed by a cylinder and a regular polygonal cylinder, said cylinder being disposed in said inner bore.
4. The high power, high voltage and high frequency transformer according to claim 3, characterized in that the regular polygonal cylinder of said core is connected with said plurality of yokes outwards, said plurality of yokes are arranged radially and equally distributed on the whole circumference, and the ends of the yokes are connected with pole shoes.
5. The high-power high-voltage high-frequency transformer according to claim 1, wherein the primary side shield and the secondary side shield comprise filling holes, filling process holes and lead holes, and the filling holes are used for vacuum filling of heat-conducting insulating filling glue into the inner cavity of the filling mould when the high-power high-voltage high-frequency transformer is filled and sealed by the filling mould; the encapsulation process hole is used for exhausting air and removing redundant colloid after encapsulation is finished; the lead wire hole is used for leading out lead wires of the primary winding and the secondary winding.
6. The high power, high voltage, high frequency transformer according to any of claims 1-5, wherein said insulating spacer comprises: the umbrella skirt is arranged on the part of the insulating partition plate, which is exposed out of the primary side shielding case and the secondary side shielding case.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071583A (en) * | 2020-07-23 | 2020-12-11 | 中国科学院电工研究所 | High-isolation voltage-resistant planar transformer and high-voltage insulation method thereof |
| CN114334385A (en) * | 2022-01-06 | 2022-04-12 | 清华大学 | Megawatt medium-frequency shell type isolation transformer based on amorphous magnetic core |
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2020
- 2020-10-16 CN CN202011106620.5A patent/CN112271065A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112071583A (en) * | 2020-07-23 | 2020-12-11 | 中国科学院电工研究所 | High-isolation voltage-resistant planar transformer and high-voltage insulation method thereof |
| US11328857B2 (en) | 2020-07-23 | 2022-05-10 | Institute Of Electrical Engineering, Chinese Academy Of Sciences | High-voltage isolation withstand planar transformer and high-voltage insulation method thereof |
| CN114334385A (en) * | 2022-01-06 | 2022-04-12 | 清华大学 | Megawatt medium-frequency shell type isolation transformer based on amorphous magnetic core |
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