Winding structure of high-voltage and high-frequency loose coupling transformer

Abstract

The utility model discloses a winding structure of a high-voltage and high-frequency loose coupling transformer. The winding structure comprises two gaskets, a primary winding and a secondary winding. The two gaskets are respectively embedded in a primary side iron core and a secondary side iron core of the loose coupling transformer, and the secondary side iron core is synchronously sleeved on a rotating shaft of the loose coupling transformer; the primary winding and the secondary winding are respectively wound in gaskets in the primary side iron core and the secondary side iron core; the utility model can obviously reduce the opposite coupling area of the winding, reduce the leakage inductance, fully utilize the space of the transformer, reduce the volume and weight of the transformer, and improve the power density of the transformer; through the double-layer staggered cake type structure of the primary winding and the secondary winding, the interlayer distributed voltage is obviously reduced, the distributed capacitance between the windings is reduced, the current peak is weakened, the transformer loss is reduced, and the transmission efficiency of the transformer is improved.

Description

Technical Field

[0001] The utility model relates to a winding structure, relates to the technical field of transformers, and in particular to a winding structure of a high-voltage and high-frequency loosely coupled transformer. Background Art

[0002] Loosely coupled transformers are an important part of wireless power transmission systems. In order to reduce the size and weight of transformers and increase power density, high-frequency alternating current needs to be injected into the primary side of the transformer to enhance the strength of the magnetic field excited by the primary current of the loosely coupled transformer. However, when high-frequency alternating current is introduced, the influence of transformer parasitic parameters on system performance cannot be ignored. The parasitic parameters of the transformer mainly include leakage inductance and distributed capacitance. The energy storage of leakage inductance and distributed capacitance has a greater impact under high voltage conditions. When the power tube is converted, both will release energy, causing peak voltage and current, which will increase the loss. The conventional staggered winding structure of the primary and secondary windings can make the magnetic potentials on both sides cancel each other, reduce the maximum value of the magnetic strength, and thus reduce parasitic parameters such as leakage inductance. However, since the loosely coupled transformer is also used in rotating occasions, the staggered winding of the primary and secondary windings will increase the total length of the air gap, which will increase the leakage inductance value of the transformer under this winding structure. Utility Model Content

[0003] In order to solve the problems in the background technology, the utility model provides a winding structure of a high-voltage and high-frequency loosely coupled transformer. The utility model optimizes the winding structure and matches the transformer body to reduce parasitic parameters such as distributed capacitance of the loosely coupled transformer that meets the rotation requirements in high-frequency and high-voltage occasions.

[0004] The technical solution adopted by the utility model is:

[0005] The winding structure of the high-voltage and high-frequency loosely coupled transformer of the utility model comprises:

[0006] Two gaskets are respectively embedded in the primary side iron core and the secondary side iron core of the loosely coupled transformer, and the secondary side iron core is synchronously sleeved on the rotating shaft of the loosely coupled transformer.

[0007] The primary winding is wound in the gasket in the primary side core.

[0008] The secondary winding is wound in the spacers in the secondary side core.

[0009] The two gaskets are both annular sheets, and an annular groove is opened in the middle of the annular surface of one side of each gasket. The annular grooves of the two gaskets are opposite to each other and are arranged symmetrically. The primary winding and the secondary winding are respectively wound in the annular grooves of the two gaskets. The primary winding and the secondary winding are respectively arranged opposite to each other and are arranged symmetrically; the annular surfaces of the other sides of the two gaskets are respectively embedded in the primary side iron core and the secondary side iron core of the loosely coupled transformer.

[0010] The transformer core of the loosely coupled transformer consists of a primary side core and a secondary side core, both of which are semi-can structures. The secondary side core is fixedly mounted on the side of the rotating shaft, and the primary side core is mounted outside the secondary side core and fixed inside the loosely coupled transformer. The primary side core and the secondary side core and the gaskets inside them are not in contact with each other.

[0011] The two gaskets are symmetrical to the symmetry plane at the center position between them, the primary winding and the secondary winding are arranged symmetrically to the symmetry plane of the two gaskets, and the primary winding and the secondary winding are concentrically coupled and have no offset.

[0012] The primary winding and the secondary winding are both double-layer alternating windings, the total number of turns N of the primary winding and the secondary winding is the same, and N is an even number; the first winding layer of the primary winding and the secondary winding is located on the side close to the center of the two gaskets, and the second winding layer is located on the side away from the center of the two gaskets and fits the inner wall surface of the annular groove of the gasket where it is located, the first winding layer and the second winding layer are both wound into a circular pancake shape with the rotation axis as the central axis, the first winding layer and the second winding layer are arranged in an overlapping manner, and each turn in the first winding layer and the second winding layer is wound The group wires are arranged in sequence and closely fit along the groove width direction of the annular groove of the gasket; the individual winding wires in the two winding layers are superimposed and arranged alternately, the 1st, 3rd, ..., N-1th turns of the winding wire are located in the second winding layer, and the 2nd, 4th, ..., Nth turns of the winding wire are located in the first winding layer, the 1st turn of the winding wire is wound around the circumference of the annular groove of the gasket at the top corner of the annular groove and is located on the side close to the rotation axis, each turn of the winding wire in the first winding layer is closely fitted between the previous turn and the next turn of the winding wire in the second winding layer, and the last turn of the winding wire in the two winding layers is arranged alternately.

[0013] The first turn of the winding wire in the first winding layer and the last turn of the winding wire in the second winding layer do not fit the side wall surface of the annular groove, and the last turn of the winding wire in the first winding layer and the first turn of the winding wire in the second winding layer both fit the side wall surface of the annular groove.

[0014] The total number of turns of each layer of the primary winding and the secondary winding is the same.

[0015] The primary winding and the secondary winding are both bonded in the annular grooves of their respective gaskets by epoxy adhesive; and the adjacent turns of winding wires in the primary winding are bonded to each other by epoxy adhesive.

[0016] The beneficial effects of the utility model are:

[0017] 1. Compared with the single-layer winding, this winding structure significantly reduces the winding positive coupling area, reduces the leakage inductance, fully utilizes the transformer space, reduces the transformer volume and weight, and improves the transformer power density.

[0018] 2. Compared with the cross-type winding structure, the winding structure of the utility model significantly reduces the inter-layer distributed voltage, reduces the distributed capacitance between windings, weakens the current spike, reduces the transformer loss, and improves the transformer transmission efficiency.

[0019] 3. The winding structure of the utility model can reduce the influence of parasitic parameters on system performance under high-frequency conditions and optimize the transmission performance of the transformer, whether in static or rotating situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the utility model;

[0021] In the figure: 1. primary side iron core, 2. secondary side iron core, 3. rotating shaft, 4. primary winding, 5. secondary winding, 6. gasket. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In the winding structure of a high-voltage and high-frequency loosely coupled transformer provided by the utility model, the transformer core of the loosely coupled transformer is composed of a primary side core 1 and a secondary side core 2, the primary side core 1 and the secondary side core 2 of the transformer core are both in a semi-can structure, the secondary side core 2 is fixedly sleeved on the side of the rotating shaft 3, the primary side core 1 is sleeved outside the secondary side core 2 and fixed inside the loosely coupled transformer, the primary side core 1 and the secondary side core 2 and the gasket 6 inside thereof are not in contact; the primary side core 1 and the secondary side core 2 are loosely coupled through an air gap, which is convenient for wireless power transmission in rotating occasions. High frequency and high voltage are specifically higher than 100K frequency and higher than 800V voltage.

[0024] like Figure 1 As shown, the winding structure of the high-voltage and high-frequency loosely coupled transformer of the utility model includes a primary winding 4, a secondary winding 5 and two gaskets 6, the two gaskets 6 are respectively embedded in the primary side iron core 1 and the secondary side iron core 2 of the loosely coupled transformer, the secondary side iron core 2 is synchronously mounted on the rotating shaft 3 of the loosely coupled transformer, the primary winding 4 and the secondary winding 5 are respectively wound on the inner hollow column wall surface of the gasket 6 in the primary side iron core 1 and the secondary side iron core 2, and are arranged axially, so as to adapt to the situation of limited transformer layout space; the primary winding 4 and the secondary winding 5 are both bonded in the annular grooves of their respective gaskets 6 by epoxy glue.

[0025] The two gaskets 6 are both annular sheets, and an annular groove is provided in the middle of the annular surface of one side of each gasket 6. The annular grooves of the two gaskets 6 are opposite to each other and arranged symmetrically. The primary winding 4 and the secondary winding 5 are respectively wound in the annular grooves of the two gaskets 6. The primary winding 4 and the secondary winding 5 are opposite to each other and arranged symmetrically. The annular surfaces of the other sides of the two gaskets 6 are respectively embedded in the primary side iron core 1 and the secondary side iron core 2 of the loosely coupled transformer. The two gaskets 6 are symmetrical to the symmetry plane at the center position between the two gaskets 6. The primary winding 4 and the secondary winding 5 are arranged symmetrically to the symmetry plane of the two gaskets 6. The primary winding 4 and the secondary winding 5 are concentrically coupled and have no offset.

[0026] The gasket 6 is a thin-walled hollow ring with an upper opening whose bottom contour is adapted to the inner surface contour of the core. The primary winding 4 and the secondary winding 5 are respectively fixed to the gasket 6 by epoxy glue, so that the primary winding 4 and the secondary winding 6 are concentrically facing each other, avoiding displacement when the secondary side core 2 rotates at high speed, thereby reducing the coupling effect and affecting the transmission effect of the transformer.

[0027] The primary winding 4 and the secondary winding 5 are both double-layer alternating windings, and the number of turns of the windings is alternately wound in sequence, so that the distributed voltage between the layers is the voltage drop of a single-turn coil, which significantly reduces the inter-layer voltage. If there are n turns of coils, the inter-layer voltage drop is U / n, where U is the voltage, thereby reducing the distributed capacitance between the windings, weakening the current spike, reducing the transformer loss, and improving the transformer transmission efficiency. The total number of turns N of the primary winding 4 and the secondary winding 5 is the same, N is an even number, and the total number of turns of each winding layer of the primary winding 4 and the secondary winding 5 is the same. In specific implementation, a primary winding 4 and a secondary winding 5 with a total number of turns of 10 are used, and the number of turns of each winding layer in the primary winding 4 and the secondary winding 5 is 5; the first winding layer of the primary winding 4 and the secondary winding 5 are both located on the side close to the center of the two gaskets 6, and the second winding layer is located on the side away from the center of the two gaskets 6 and fits the inner wall surface of the annular groove of the gasket 6 where it is located. The first winding layer and the second winding layer are both wound into a circular pancake shape with the rotating shaft 3 as the central axis. The first winding layer and the second winding layer The winding layers are arranged overlapping each other, and each turn of the winding wire in the first winding layer and the second winding layer is tightly fitted in sequence along the groove width direction of the annular groove of the gasket 6; the winding wires in the two winding layers are overlapped and arranged alternately, the Ⅰ, Ⅲ, Ⅴ, Ⅶ, Ⅸ turns of the winding wire are located in the second winding layer, and the Ⅱ, Ⅳ, Ⅵ, Ⅷ, and Ⅹ turns of the winding wire are located in the first winding layer, the first turn of the winding wire is wound around the top corner of the annular groove of the gasket 6 along the circumferential direction of the annular groove and is located on the side close to the rotating shaft 3, each turn of the winding wire in the first winding layer is tightly fitted between the previous turn and the next turn of the winding wire in the second winding layer, and the last turn of the winding wire in the two winding layers is arranged alternately. The first turn of the winding wire in the first winding layer and the last turn of the winding wire in the second winding layer do not fit the side wall of the annular groove, and the last turn of the winding wire in the first winding layer and the first turn of the winding wire in the second winding layer both fit the side wall of the annular groove. Adjacent turns of the winding wire in the primary winding 4 are bonded to each other by epoxy glue, making the coil structure more compact and stable, and preventing the winding structure from being deformed due to high-speed centrifugal force.

[0028] Those skilled in the art will easily think of other embodiments of the present application after considering the contents disclosed in the specification and practice sections. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary technical means in the art that are not disclosed in the present application.

Claims

1. A winding structure of a high-voltage and high-frequency loosely coupled transformer, characterized in that: include: Two gaskets (6) are respectively embedded in the primary side iron core (1) and the secondary side iron core (2) of the loosely coupled transformer, and the secondary side iron core (2) is synchronously sleeved on the rotating shaft (3) of the loosely coupled transformer; A primary winding (4) is wound in a gasket (6) in the primary side iron core (1); The secondary winding (5) is wound in a gasket (6) in the secondary side iron core (2).

2. The winding structure of the high-voltage and high-frequency loosely coupled transformer according to claim 1 is characterized in that: The two gaskets (6) are both annular sheets, and an annular groove is provided in the middle of an annular surface on one side of each gasket (6). The annular grooves of the two gaskets (6) are opposite to each other and are spaced apart and symmetrically arranged. The primary winding (4) and the secondary winding (5) are respectively wound in the annular grooves of the two gaskets (6). The primary winding (4) and the secondary winding (5) are opposite to each other and are spaced apart and symmetrically arranged. The annular surfaces on the other sides of the two gaskets (6) are respectively embedded in the primary side iron core (1) and the secondary side iron core (2) of the loosely coupled transformer.

3. The winding structure of the high-voltage and high-frequency loosely coupled transformer according to claim 2 is characterized in that: The two gaskets (6) are symmetrical to a symmetry plane at a central position therebetween, and the primary winding (4) and the secondary winding (5) are arranged symmetrically to the symmetry plane of the two gaskets (6).

4. The winding structure of the high-voltage and high-frequency loosely coupled transformer according to claim 2 is characterized in that: The primary winding (4) and the secondary winding (5) are both double-layer alternating windings, and the total number of turns N of the primary winding (4) and the secondary winding (5) are the same; the first winding layer of the primary winding (4) and the secondary winding (5) are both located on a side close to the center of the two gaskets (6), and the second winding layer is located on a side away from the center of the two gaskets (6) and fits the inner wall surface of the annular groove of the gasket (6) where it is located; the first winding layer and the second winding layer are both wound into a circular pancake shape with the rotation axis (3) as the central axis; the first winding layer and the second winding layer are arranged to overlap each other, and the first winding layer and the second winding layer are arranged to overlap each other. Each turn of the winding wire in the winding layer is arranged in sequence and closely fit along the groove width direction of the annular groove of the gasket (6); the winding wires in the two winding layers are superimposed and arranged alternately, the 1st, 3rd, ..., N-1th turns of the winding wire are located in the second winding layer, and the 2nd, 4th, ..., Nth turns of the winding wire are located in the first winding layer, the 1st turn of the winding wire is wound around the top corner of the annular groove of the gasket (6) along the circumference and is located on the side close to the rotating shaft (3), each turn of the winding wire in the first winding layer is closely fitted between the previous turn and the next turn of the winding wire in the second winding layer, and the last turn of the winding wire in the two winding layers is arranged alternately.

5. The winding structure of the high-voltage and high-frequency loosely coupled transformer according to claim 4 is characterized in that: The total number of turns of each layer of the primary winding (4) and the secondary winding (5) are the same.

6. The winding structure of the high-voltage and high-frequency loosely coupled transformer according to claim 4, characterized in that: The primary winding (4) and the secondary winding (5) are both bonded to the annular grooves of their respective gaskets (6) by epoxy glue; adjacent turns of winding wires in the primary winding (4) are bonded to each other by epoxy glue.

Images