阅读说明：本技术 一种适用于离子式电推进系统电源处理单元的变压器 (Transformer suitable for ionic electric propulsion system power supply processing unit ) 是由 张保平 武荣 王少宁 郑瀚 尹晓丽 冯玮玮 徐恒通 于 2019-12-26 设计创作，主要内容包括：本发明公开了一种适用于离子式电推进系统电源处理单元的变压器,通过采用态环氧材料制作逐层嵌套的变压器骨架,采用环氧灌封胶将变压器整体灌封,灌封胶通过骨架侧面的开孔将绕组及骨架之间的空隙密实填充,具有固体绝缘作用,防止产生低气压并发生介质阻挡气放电,同时,环氧灌封胶能够与固态环氧骨架表面产生较好的相溶性,并与漆包线之间具有较好的粘接性,保证内部材料间良好的热传导。(The invention discloses a transformer suitable for an ionic electric propulsion system power supply processing unit, which is characterized in that a transformer framework nested layer by layer is manufactured by adopting a state epoxy material, an epoxy pouring sealant is adopted to encapsulate the whole transformer, the pouring sealant densely fills gaps between a winding and the framework through an opening on the side surface of the framework, the transformer has a solid insulation effect, low air pressure is prevented from being generated, dielectric barrier gas discharge is prevented from being generated, meanwhile, the epoxy pouring sealant can generate better intermiscibility with the surface of the solid epoxy framework, and better adhesion property is realized between the epoxy pouring sealant and an enameled wire, so that good heat conduction between internal materials is ensured.)

1. A transformer suitable for an ionic electric propulsion system power supply processing unit comprises a magnetic core (1), a transformer framework, a winding and a shell (8), wherein the transformer framework is encapsulated in the shell (8) by epoxy encapsulating glue; the transformer framework is made of solid epoxy material;

the transformer framework comprises a plurality of sleeved ring bodies, each ring body is a hollow cylinder with a cavity in the side wall, and the ring body positioned on the inner layer is sleeved in the cavity of the ring body positioned on the outer side; the annular body A positioned at the innermost layer is a vacuum sealing cavity, and the magnetic core is packaged in the sealing cavity; winding is wound on the surface of each annular body except the annular body A, the winding generates a magnetic field around the axial direction of the magnetic core (1), and the winding is led out of the input end or the output end of the transformer; the surface of each annular body except the annular body A is provided with a glue filling hole.

2. A transformer according to claim 1, characterised in that the outer surface of the ring-shaped bodies has a limiting structure (9), which limiting structure (9) is adapted to define the distance between the ring-shaped bodies.

3. The transformer according to claim 1, wherein the ring body is divided into an upper portion and a lower portion.

4. The transformer according to claim 1, wherein the outer side surface of the ring body has a ring cutout a, and the inner side surface of the ring body has a ring cutout B and a ring cutout C, the ring cutout a, the ring cutout B, and the ring cutout C dividing the surface of the ring body into an upper portion, a middle portion, and a lower portion, the middle portion being a hollow cylinder.

5. The transformer according to claim 1, wherein the annular body a has vent holes on its surface.

6. The transformer of claim 1, wherein the housing is a hollow cylindrical structure, such that the transformer is potted in a cylindrical shape.

7. The transformer according to claim 1, wherein the spacing structures of the toroidal bodies at different layers are of different sizes.

Technical Field

The invention belongs to the technical field of transformers, and particularly relates to a transformer suitable for a power supply processing unit of an ionic electric propulsion system.

Background

The ion thruster accelerates and draws out plasma in the discharge chamber through high voltage field intensity between the grids to generate reaction force, and is mainly applied to tasks of spacecraft orbit transfer, orbit maintenance, momentum wheel unloading and the like. On the spacecraft, a 100V direct current bus is boosted to high voltage through a switching power supply and is applied to a grid of an ion thruster, and high voltage field intensity between the grids is obtained. The switching power supply converts a 100V direct current power supply into alternating current through an MOSFET, inputs the alternating current into a primary side of a transformer, and boosts the alternating current to a required voltage through a turn ratio. When the existing switching power supply transformer uses an annular magnetic core, two or more windings are usually directly wound on the magnetic core, the windings are isolated by using an insulating film (polyimide or polytetrafluoroethylene), and meanwhile, vacuum dip coating treatment is performed to strengthen insulation. When the secondary voltage is increased to hundreds of volts or more and thousands of volts, because the distance between the low-voltage winding and the high-voltage winding is too small, the uniformity of an electric insulation gap in the manual winding process cannot be ensured, and meanwhile, the quality loss rate of an insulating paint material is higher, so that more air gaps are caused in the product, and the breakdown discharge is easily caused; particularly, after the transformer enters a vacuum environment, air stored in small gaps among windings is difficult to leak quickly, and a dielectric barrier discharge phenomenon is easy to cause during working, so that the service life of the transformer is greatly shortened; in addition, the contact area of the transformer and the mounting surface is only in the shape of a ring line, which is not beneficial to heat dissipation of the transformer.

Disclosure of Invention

In view of the above, the present invention provides a transformer suitable for a power processing unit of an ionic electric propulsion system, which can provide corresponding voltage for an ion thruster according to requirements.

The invention provides a transformer suitable for an ionic electric propulsion system power supply processing unit, which comprises a magnetic core 1, a transformer framework, a winding and a shell 8, wherein the transformer framework is encapsulated in the shell 8 by epoxy potting adhesive; the transformer framework is made of solid epoxy material;

the transformer framework comprises a plurality of sleeved ring bodies, each ring body is a hollow cylinder with a cavity in the side wall, and the ring body positioned on the inner layer is sleeved in the cavity of the ring body positioned on the outer side; the annular body A positioned at the innermost layer is a vacuum sealing cavity, and the magnetic core is packaged in the sealing cavity; winding is wound on the surface of each annular body except the annular body A, the winding generates a magnetic field around the axial direction of the magnetic core 1, and the winding is led out of the input end or the output end of the transformer; the surface of each annular body except the annular body A is provided with a glue filling hole.

Further, the outer surface of the ring bodies has a limiting structure 9, and the limiting structure 9 is used for limiting the distance between the ring bodies.

Further, the annular body is divided into an upper part and a lower part.

Further, the outer side surface of the annular body is provided with an annular notch A, the inner side surface of the annular body is provided with an annular notch B and an annular notch C, the annular notch A, the annular notch B and the annular notch C divide the surface of the annular body into an upper part, a middle part and a lower part, and the middle part is a hollow cylinder.

Further, the annular body a has vent holes on its surface.

Furthermore, the shell is of a hollow cylindrical structure, so that the transformer is encapsulated into a cylinder.

Further, the size of the limiting structures of the annular bodies at different layers is different.

Has the advantages that:

1. according to the transformer, the transformer frameworks which are nested layer by layer are manufactured by adopting the state epoxy material, and different intervals are formed among the frameworks, so that the primary winding and the magnetic core are isolated from each other, and the high-voltage winding and the low-voltage winding are isolated from each other, so that the intervals among the high-voltage winding and the low-voltage winding are increased; the transformer is integrally encapsulated by the epoxy encapsulating glue, the encapsulating glue is used for densely filling gaps between the winding and the framework through the opening on the side surface of the framework, the solid insulation effect is achieved, low air pressure is prevented from being generated, medium gas barrier discharge is prevented from being generated, meanwhile, the epoxy encapsulating glue can generate better compatibility with the surface of the solid epoxy framework, better adhesion is achieved between the epoxy encapsulating glue and the enameled wire, and good heat conduction between internal materials is guaranteed;

2. according to the invention, the transformer is encapsulated into a cylinder shape through the cylindrical shell, the cylindrical transformer can increase the contact area with the installation surface, the heat dissipation and conduction of the transformer heat dissipation are facilitated, and the working reliability of the transformer is improved.

Drawings

Fig. 1 is a front view of a transformer suitable for an ionic electric propulsion system power supply processing unit according to the present invention.

Fig. 2 is a schematic diagram of an upper and lower transformer bobbin of a transformer suitable for an ionic electric propulsion system power supply processing unit according to the present invention.

Fig. 3 is a schematic diagram of a transformer skeleton with a three-segment structure of a transformer suitable for an ionic electric propulsion system power supply processing unit according to the present invention.

The winding device comprises a magnetic core 1, an inner framework 2, a primary winding 3, a middle framework 4, a secondary winding A5, an outer framework 6, a secondary winding B7, a shell 8, a sleeve A9, a sleeve B10, a limiting structure 11, an upper annular body 201, a lower annular body 202 and a middle barrel 203.

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.

The transformer suitable for the power supply processing unit of the ionic electric propulsion system comprises a magnetic core 1, a transformer framework, a winding and a shell 8, wherein the transformer framework is made of solid epoxy materials, and the transformer framework is encapsulated in the shell 8 by adopting epoxy potting adhesive.

The transformer framework comprises a plurality of layers of annular bodies, each annular body is a hollow cylinder with a cavity in the side wall, and the annular bodies are nested layer by layer from inside to outside, for example, the annular body in the inner layer is nested in the cavity of the annular body in the outer layer. The annular body is of an up-down split structure, and the upper annular body 201 and the lower annular body 202 are buckled to form the annular body, as shown in fig. 2. The outer surface of the ring body is provided with a limiting structure, the distance between the mutually nested ring bodies can be limited, and the limiting structure can have different sizes so as to ensure that different intervals are formed between the frameworks of all layers, so that the primary winding is isolated from the magnetic core, the high-voltage winding is isolated from the low-voltage winding, and the intervals between the high-voltage winding and the low-voltage winding are fully increased.

The annular body positioned on the innermost layer is a sealed cavity body, the sealed cavity body is provided with a vent hole used for vacuumizing the sealed cavity body, the magnetic core is packaged in the sealed cavity body, and the winding is not wound on the outer surface of the annular body packaged with the magnetic core. The annular body encapsulated with the magnetic core is nested in the cylindrical cavity of the annular body on the outer layer, the winding is wound on the outer surface of the annular body on the axial direction of the annular body on the outer layer, the side wall of the annular body on the outer layer is provided with an opening, pouring sealant flows into the annular body through the opening to densely fill the gap between the winding and the framework, the solid insulation effect is achieved, low air pressure is prevented from being generated, and dielectric barrier gas discharge is prevented from occurring. The input or output end of the transformer is led out through the winding.

The shell of the transformer is of a hollow cylindrical structure, so that the transformer is encapsulated into a cylindrical shape, the cylindrical transformer can increase the contact area with an installation surface, conduction and heat dissipation are facilitated, and the working reliability of the transformer is improved.

Example (b):

in this embodiment, a 4-layer cylindrical transformer bobbin structure is taken as an example to illustrate the transformer suitable for the power processing unit of the ionic electric propulsion system, as shown in fig. 1, the transformer includes a magnetic core 1, an inner bobbin 2, a primary winding 3, an intermediate bobbin 4, a secondary winding a5, an outer bobbin 6, a secondary winding B7, a housing 8, a sleeve a9, a sleeve B10, and a mounting screw hole 11.

The magnetic core is an annular magnetic core, the input voltage of a primary winding is 100V, the number of turns is 8, each turn is composed of 15 strands of enameled wires with the specification of 0.56mm, the enameled wires can pass 15A current to the maximum and can be wound on an inner framework, and the distance between the inner framework and a middle framework is 1.5 mm; the secondary winding A is 44 turns, each turn is composed of 7 strands of enameled wires with the specification of 0.4mm, the enameled wires can pass 5A of current to the maximum extent and are wound on the middle framework, the distance between the middle framework and the outer framework is 1.5mm, and the secondary winding A outputs 600-700V high voltage; the secondary winding B is 33 turns, each turn is composed of 3 strands of enameled wires with the specification of 0.4mm, the enameled wires can be wound on an outer framework through 500mA current to the maximum extent, the distance between the outer framework and the shell is 2mm, and the secondary winding B outputs 300V high voltage. The design ensures the space between the primary winding and the magnetic core and between the high-voltage winding and the low-voltage winding, and prevents the discharge breakdown caused by the over-small space.

In another embodiment, in order to facilitate the processing of a ring body with a higher height, the ring body is divided into three parts, namely an upper ring body 201, a lower ring body 202 and a middle cylinder 203, and the three parts are combined to form the ring body, as shown in fig. 3.

According to the invention, under the constraint of the shell, the transformer is integrally encapsulated by using the epoxy encapsulating glue, so that no gap is formed in the transformer, and the glue is cured by heating and drying after encapsulation. In a low-pressure gas or vacuum state, a low-pressure region or a gap cannot be formed between high pressure and low pressure due to the existence of the colloid, so that low-pressure discharge breakdown is avoided; after the colloid is solidified, the bottom surface of the transformer is a cylindrical surface, the transformer is fastened on the mounting surface through the mounting screw hole, the bottom surface of the transformer is fully contacted with the mounting surface, heat dissipation of the transformer through conduction is facilitated, failure of the transformer due to overheating is prevented, and reliability of the transformer is improved.

In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.