CN111326330A

CN111326330A - Coil assembly, pulse transformer and medical equipment

Info

Publication number: CN111326330A
Application number: CN202010277326.4A
Authority: CN
Inventors: 龚熙国
Original assignee: Shanghai United Imaging Healthcare Co Ltd
Current assignee: Shanghai United Imaging Healthcare Co Ltd
Priority date: 2020-04-10
Filing date: 2020-04-10
Publication date: 2020-06-23
Also published as: CN116631744A

Abstract

The invention relates to a coil component, a pulse transformer and medical equipment. The coil assembly comprises a magnetic core and a primary coil wound on the magnetic core; an insulating sleeve and an insulating partition plate arranged on the insulating sleeve are further arranged between the magnetic core and the primary coil, and the magnetic core is sleeved with the insulating sleeve; the primary coil comprises at least two primary windings, and each primary winding is wound on the outer side surface of the insulating sleeve in a single-coil mode and arranged at intervals through the insulating partition plate. The coil assembly is provided with the insulating sleeve and the insulating partition plate between the magnetic core and the primary coil, so that each primary winding of the primary coil is wound on the periphery of the insulating sleeve in a single-coil foil winding mode and is arranged at intervals through the insulating partition plate, leakage inductance caused by the primary coil can be correspondingly reduced, the insulating requirement between the primary coil and the magnetic core is met, and the stability of the pulse transformer is correspondingly improved.

Description

Coil assembly, pulse transformer and medical equipment

Technical Field

The invention relates to the technical field of medical equipment, in particular to a coil assembly, a pulse transformer and medical equipment.

Background

The high voltage pulse modulator is a key component in medical equipment and mainly plays a role in providing pulse voltage for a microwave source. The pulse transformer is an important component of the pulse modulator, and generally includes a magnetic core, a primary coil, and a secondary coil. The existing pulse transformer has larger distortion of the pulse waveform output by the pulse transformer due to larger leakage inductance, thereby influencing the stability of the output power of the pulse transformer.

Disclosure of Invention

In view of the above, there is a need to provide an improved coil assembly, pulse transformer and medical device. The coil assembly is provided with the insulating sleeve and the insulating partition plate between the magnetic core and the primary coil, so that each primary winding of the primary coil is wound on the periphery of the insulating sleeve in a single-coil foil winding mode and is arranged at intervals through the insulating partition plate, leakage inductance caused by the primary coil can be correspondingly reduced, the insulating requirement between the primary coil and the magnetic core is met, and the stability of the pulse transformer is correspondingly improved.

A coil component comprises a magnetic core and a primary coil wound on the magnetic core;

an insulating sleeve and an insulating partition plate arranged on the insulating sleeve are further arranged between the magnetic core and the primary coil, and the magnetic core is sleeved with the insulating sleeve;

the primary coil comprises at least two primary windings, and each primary winding is wound on the outer side surface of the insulating sleeve in a single-coil foil mode and is arranged at intervals through the insulating partition plate.

Further, the magnetic core comprises a plurality of magnetic core legs connected in sequence; the inner side surface is attached to the outer side surface corresponding to the magnetic core leg.

So set up, can reduce the distance of insulating sleeve between the magnetic core to the corresponding leakage inductance that reduces.

Furthermore, the number of the insulating partition plates is multiple, and the multiple insulating partition plates are arranged at equal intervals along the axial direction of the insulating sleeve.

The arrangement is that the insulating partition plate and the insulating sleeve are arranged in an enclosing manner to form a plurality of winding slots for arranging a plurality of primary windings; and winding slots are formed at equal intervals such that distances between the respective primary windings disposed in the winding slots are equal.

Furthermore, two ends of each primary winding are respectively and electrically connected with a lead terminal, a lead slot is formed in the position corresponding to the insulating partition plate, and the two lead terminals can extend out of the insulating sleeve through the lead slots.

So set up, can be convenient for primary winding stretch out the wire winding groove and connect in external power.

Further, the bottom wall of the lead groove extends outward and forms a partition plate for partitioning the two lead terminals. With this configuration, leakage inductance and parasitic capacitance between the two lead terminals can be reduced as much as possible.

Further, the thickness of the insulating spacer ranges from 0.5mm to 1 mm. The arrangement is such that the spacing between the primary windings is as small as possible to reduce leakage inductance between the primary windings.

Further, the insulating sleeve is made of an epoxy resin plate; and/or the presence of a catalyst in the reaction mixture,

the insulating partition plate is made of an epoxy resin plate. So set up to make the cost of manufacture of insulating sleeve and insulating barrier lower, and correspondingly can make the magnetic core separate with between the primary winding, make simultaneously and separate between each primary winding.

Further, at least two groups of the primary windings are arranged in parallel.

Further, the coil assembly further comprises a secondary coil, an isolation framework is arranged between the secondary coil and the primary coil, and the secondary coil is wound on the periphery of the primary coil in a stacked mode through the isolation framework; and/or the presence of a catalyst in the reaction mixture,

the secondary coil is formed by winding a plurality of turns of conducting wires. So set up, isolation framework can separate primary coil and secondary coil.

Further, the magnetic core comprises a plurality of magnetic core legs connected in sequence; the number of the secondary coils is two, and each group of the secondary coils are respectively wound on the two oppositely arranged magnetic core legs.

The invention also provides a pulse transformer comprising a coil assembly as described in any one of the above.

The invention also provides medical equipment which comprises the pulse transformer.

The invention provides a coil assembly, wherein an insulating sleeve and an insulating partition plate are arranged between a magnetic core and a primary coil, so that each primary winding of the primary coil is wound on the periphery of the insulating sleeve in a single-coil foil winding mode and is arranged at intervals through the insulating partition plate, the leakage inductance caused by the primary coil can be correspondingly reduced, the insulating requirement between the primary coil and the magnetic core is met, and the stability of a pulse transformer is correspondingly improved.

Drawings

FIG. 1 is a schematic diagram of a coil assembly according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the primary and secondary windings of the coil assembly of FIG. 1;

FIG. 3 is a schematic diagram of the primary coil of the coil assembly of FIG. 1;

FIG. 4 is a cross-sectional view of the magnetic core leg sleeved by the insulating sleeve shown in FIG. 3;

FIG. 5 is a cross-sectional view of the coil assembly of FIG. 3 from another perspective;

fig. 6 is a schematic diagram of a primary winding in one of the winding slots of the coil assembly shown in fig. 3.

100, a coil assembly; 10. a magnetic core; 11. a magnetic core leg; 20. a primary coil; 21. a primary winding; 211. a metal foil; 212. an insulating layer; 22. a lead terminal; 30. a secondary coil; 40. isolating the skeleton; 50. an insulating sleeve; 51. a winding slot; 60. an insulating spacer; 61. a lead slot; 62. a partition plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a coil assembly 100 according to an embodiment of the present invention.

The invention provides a coil assembly 100, which is applied to a pulse transformer, wherein the coil assembly 100 is used for converting voltage in the pulse transformer.

The coil assembly 100 is used as a key component of a pulse transformer and is applied to a high-voltage pulse modulator.

The high-voltage pulse modulator is a key component in medical equipment, and mainly has the function of outputting a series of pulse voltages with high power, a certain repetition frequency and a certain pulse width to loads such as a magnetron or a speed regulating tube. The high-voltage pulse modulator is generally composed of three parts, namely a high-voltage direct-current power supply, a switching unit and a pulse transformer.

The pulse transformer plays the roles of boosting pulse voltage, electrical isolation and impedance matching in the high-voltage pulse modulator. Compared with the common transformer, the design key of the pulse transformer is that the parasitic parameters such as leakage inductance and distributed capacitance are accurate enough, and only then, the pulse waveform distortion output by the pulse transformer can be within an allowable range. Therefore, the design of the coil assembly 100 in the pulse transformer is important.

Of course, the coil assembly 100 of the present invention may also be applied to other general transformers.

The coil assembly 100 includes a magnetic core 10, a primary coil 20, and a secondary coil 30, and the primary coil 20 and the secondary coil 30 are respectively wound around the magnetic core 10. The magnetic core 10 is used for winding a primary coil 20 and a secondary coil 30, the primary coil 20 is used for connecting with an external power supply, and the secondary coil 30 is used for connecting with an output end.

When the primary coil 20 is connected to an external power supply, the primary coil 20 and the secondary coil 30 have different numbers of turns, so that the secondary coil 30 generates and outputs a corresponding induced voltage.

The magnetic core 10 is substantially hollow and cylindrical, and the cross section of the magnetic core 10 has a square frame shape. It is understood that in other embodiments, the magnetic core 10 may be provided in other shapes, such as a cylindrical shape or a solid columnar shape, as long as the primary coil 20 and the secondary coil 30 can be wound.

The magnetic core 10 includes four core legs 11, and the four core legs 11 are sequentially joined to form the magnetic core 10 in a square tube shape. It is understood that, in other embodiments, the number of the core legs 11 may be one, two, three, or five or more, as long as the primary coil 20 and the secondary coil 30 can be wound.

In the present embodiment, the magnetic core 10 is formed by stacking a plurality of silicon steel sheets along the axial direction of the magnetic core 10, so as to increase or decrease the magnetic flux between the primary coil 20 and the secondary coil 30.

In one embodiment, the number of the primary coils 20 is two, and the two sets of primary coils 20 are correspondingly wound around the two oppositely disposed core legs 11. It is understood that in other embodiments, the number of the primary coils 20 may be one or more than three, as long as the primary coils are wound around the magnetic core 10 or the magnetic core legs 11 and connected to an external power source.

In one embodiment, the primary coil 20 includes at least two primary windings 21, and the at least two primary windings 21 are connected in parallel with respect to the same external power source. Of course, the specific arrangement between the primary windings 21 is set accordingly according to the actual transformation requirements of the pulse transformer. Preferably, the number of primary coils 20 is two, and the primary coils are respectively arranged on two core legs 11 of the magnetic core 10 which are oppositely arranged.

Referring to fig. 2, fig. 2 is a schematic structural diagram illustrating a winding manner of the primary coil 20 and the secondary coil 30 in the coil assembly 100 shown in fig. 1.

In the present embodiment, the secondary coil 30 and the primary coil 20 are wound around the same core leg 11, and an isolation bobbin 40 is further provided between the secondary coil 30 and the primary coil 20. The secondary coil 30 is wound around the outer periphery of the primary coil 20 via an isolation bobbin 40. The isolation bobbin 40 is used to separate the primary coil 20 and the secondary coil 30.

Preferably, the number of secondary coils 30 is two, each being wound on two oppositely disposed magnetic core legs 11 provided with primary coils 20.

It is understood that in other embodiments, the secondary coil 30 and the primary coil 20 may be respectively wound on two oppositely disposed core legs 11. The two winding manners of the secondary coil 30 and the primary coil 20 are set according to the actual working conditions.

The same secondary winding 30 is wound on the same core leg 11 using multiple turns of wire, so that the secondary winding 30 can generate a larger induced voltage.

Referring to fig. 3 and 4 together, fig. 3 is a schematic structural diagram of the primary coil 20 of the coil assembly 100 shown in fig. 1; fig. 4 is a cross-sectional view of the insulating sleeve 50 of the coil assembly 100 shown in fig. 3 covering the magnetic core leg 11.

The existing coil assembly 100 has the problems of large leakage inductance and the like in the use process of the pulse transformer, so that the waveform distortion of the pulse voltage output by the pulse transformer is large, and the stability of the pulse transformer is influenced.

In order to reduce the leakage inductance of the coil assembly 100 in the pulse transformer, an insulating sleeve 50 and an insulating spacer 60 are further disposed between the magnetic core 10 and the primary coil 20, such that each primary winding 21 of the primary coil 20 is wound around the outer circumference of the insulating sleeve 50 in a single foil winding manner and is spaced apart by the insulating spacer 60, so that the leakage inductance caused by the primary coil 20 can be correspondingly reduced, and simultaneously, the insulation requirement between the primary coil 20 and the magnetic core 10 is met, thereby correspondingly improving the stability of the pulse transformer.

In the present embodiment, the structure of the primary coil 20 itself is improved to reduce the leakage inductance generated by the primary coil 20. The secondary coil 30 in the coil assembly 100 is not necessarily a setting member.

The insulating sleeve 50 is sleeved on the magnetic core leg 11 and is arranged between the magnetic core 10 and the primary coil 20; the insulating spacer 60 surrounds the insulating sleeve 50 along a circumferential direction of the insulating sleeve 50. The insulating sleeve 50 serves to isolate the primary coil 20 from the magnetic core 10, and the insulating spacer 60 serves to space the respective primary windings 21.

The insulating sleeve 50 is substantially cylindrical, and the cross section of the insulating sleeve 50 is a square frame. The shape of the insulating sleeve 50 is adapted to the core leg 11 such that the inner side of the insulating sleeve 50 fits the outer side of the core leg 11, so as to reduce the volume of the coil assembly 100 accordingly. It is understood that in other embodiments, the insulating sleeve 50 can be provided in other shapes, such as a cylindrical shape, as long as it can match the shape of the core leg 11; the insulating sleeve 50 can also be directly sleeved on the periphery of the magnetic core 10 according to the requirement of working conditions.

The insulating spacer 60 is a substantially annular spacer, and is circumferentially provided around the outer periphery of the insulating sleeve 50. A winding slot 51 is formed between the insulating partition 60 and the insulating sleeve 50; one primary winding 21 is disposed in each winding slot 51.

In one embodiment, the number of the insulating spacers 60 is plural, and the plural insulating spacers 60 are arranged at equal intervals in the axial direction of the insulating sleeve 50. The arrangement is such that the insulating partition 60 and the insulating sleeve 50 are surrounded to form a plurality of winding slots 51 for arranging a plurality of primary windings 21; and the winding slots 51 are formed at equal intervals such that the distances between the respective primary windings 21 disposed in the winding slots 51 are equal.

In one embodiment, since the magnetic core 10 is a unitary structure that is not cut, the insulating sleeve 50 is provided as a separate structure in order to facilitate the installation of the insulating sleeve 50 on the magnetic core leg 11. After the insulating sleeves 50 are mounted on the core legs 11, the separate insulating sleeves 50 are fixedly connected by gluing or the like. It should be noted that if the insulating sleeve 50 is connected by gluing, the insulating sleeve needs to be connected by using insulating glue.

In one embodiment, the insulating sleeve 50 and the insulating spacer 60 are made of epoxy resin, so that the manufacturing cost of the insulating sleeve 50 and the insulating spacer 60 is low, and accordingly, the isolation between the magnetic core 10 and the primary winding 21 can be ensured.

Referring to fig. 5, fig. 5 is a cross-sectional view of the coil assembly 100 shown in fig. 3 from another perspective.

In the present embodiment, the primary winding 21 includes a metal foil 211 and an insulating layer 212 covering an outer surface of the metal foil 211. The metal foil 211 is used for electrical connection with an external power source, and the insulating layer 212 is used for isolating the metal foil 211 from the outside. The primary winding 21 is disposed in the winding slot 51 in a single-winding foil-winding manner and is attached to the outer surface of the insulating sleeve 50. The mode of single-circle foil winding refers to; the primary winding 21 is wound in the winding slot 51 in the form of a metal foil 211 in a single turn and is closely attached to the outer side of the insulating sleeve 50. Since the primary windings 21 are respectively disposed in the corresponding winding slots 51, the primary windings 21 are not easily overlapped with each other when being wound. By the arrangement, the winding efficiency of the primary winding 21 is improved; and parasitic parameters such as leakage inductance and distributed capacitance between the primary windings 21 can be reduced accordingly.

In one embodiment, the metal foil 211 is a copper foil, and the width of the copper foil is equal to or slightly smaller than the width of the winding slot 51, so that the copper foil can better fit on the inner wall of the winding slot 51, in consideration of the manufacturing cost and the conductivity of the primary winding 21. So configured, the primary winding 21 can reduce leakage inductance accordingly. It is understood that, regardless of the production cost, the metal foil 211 may be made of other materials, such as silver foil, etc., as long as the metal foil can be electrically connected to an external power source.

In one embodiment, the plurality of primary windings 21 are arranged in parallel with respect to the same external power source in consideration of the transformation performance of the coil assembly 100. Preferably, a plurality of primary windings 21 in the same primary coil 20 are wound around the same core leg 11 at the same time, so that a plurality of primary windings 21 arranged in parallel are connected to the same external power source.

In one embodiment, the thickness of the insulating spacer 60 ranges from 0.5mm to 1mm in order to minimize the spacing between the primary windings 21 to reduce leakage inductance between the primary windings 21.

Referring to fig. 6, fig. 6 is a schematic structural diagram of the primary winding 21 in one winding slot 51 of the coil assembly 100 shown in fig. 3.

In one embodiment, in order to facilitate the primary windings 21 to be extended and connected to an external power source, the two ends of each primary winding 21 are respectively electrically connected with the lead terminals 22, and the insulating partition 60 is provided with lead slots 61 at positions relatively close to the two ends of the primary winding 21, so that the two lead terminals 22 can be extended out of the insulating sleeve 50 through the lead slots 61. The metal foil 211 of the primary winding 21 may be connected to the lead terminals 22 by welding or the like. So set up, can be convenient for primary 21 to stretch out wire winding groove 51 and connect in external power.

Further, in order to reduce the leakage inductance and parasitic capacitance of the lead terminal 22 as much as possible, the bottom wall of the lead groove 61 is extended outward and forms a partition plate 62; the partition plate 62 is located in the middle of the lead groove 61 and connected to an adjacent partition plate. The spacing plate 62 serves to separate the two lead terminals 22. It will be appreciated that the shape of the partition plate 62 may be set accordingly depending on the actual conditions.

The invention provides a coil assembly 100, wherein an insulating sleeve 50 and an insulating partition 60 are arranged between a magnetic core 10 and a primary coil 20, so that each primary winding 21 of the primary coil 20 is wound on the periphery of the insulating sleeve 50 in a single-turn foil winding mode and is arranged at intervals through the insulating partition 60, the leakage inductance caused by the primary coil 20 can be correspondingly reduced, the insulating requirement between the primary coil 20 and the magnetic core 10 is met, and the stability of a pulse transformer is correspondingly improved.

The present invention also provides a pulse transformer (not shown) including the coil assembly 100 described above.

The invention also provides medical equipment which comprises the high-voltage pulse modulator provided with the pulse transformer. The medical device may provide radiation therapy to a patient.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A coil component comprises a magnetic core (10) and a primary coil (20) wound on the magnetic core (10); it is characterized in that the preparation method is characterized in that,

an insulating sleeve (50) and an insulating partition plate (60) arranged on the insulating sleeve (50) are further arranged between the magnetic core (10) and the primary coil (20), and the magnetic core (10) is sleeved with the insulating sleeve (50);

the primary coil (20) comprises at least two primary windings (21), and each primary winding (21) is wound on the outer side surface of the insulating sleeve (50) in a single-coil foil mode and is arranged at intervals through the insulating partition plates (60).

2. Coil assembly according to claim 1, wherein the magnetic core (10) comprises a plurality of successively connected core legs (11); the inner side surface of the insulating sleeve (50) is attached to the outer side surface corresponding to the magnetic core leg (11).

3. The coil assembly according to claim 1, wherein the insulating spacer (60) is plural in number, and the plural insulating spacers (60) are arranged at equal intervals in an axial direction of the insulating sleeve (50).

4. The coil assembly according to claim 1, wherein each of the primary windings (21) has a lead terminal (22) electrically connected to each of two ends thereof, and the insulating partition (60) has a lead groove (61) formed at a corresponding position, and both of the lead terminals (22) can extend out of the insulating sleeve (50) through the lead groove (61).

5. The coil assembly according to claim 4, wherein a bottom wall of the lead groove (61) extends outward and forms a spacing plate (62), the spacing plate (62) being used to separate the two lead terminals (22).

6. Coil assembly according to claim 1, wherein the insulating spacer (60) has a thickness in the range of 0.5mm to 1 mm.

7. Coil assembly according to claim 1, wherein the insulating sleeve (50) is made of an epoxy resin plate; and/or the presence of a catalyst in the reaction mixture,

the insulating partition plate (60) is made of an epoxy resin plate.

8. Coil assembly according to claim 1, wherein at least two sets of said primary windings (21) are arranged in parallel.

9. The coil assembly according to claim 1, further comprising a secondary coil (30), wherein an isolation frame (40) is disposed between the secondary coil (30) and the primary coil (20), and the secondary coil (30) is wound around the periphery of the primary coil (20) through the isolation frame (40); and/or the presence of a catalyst in the reaction mixture,

the secondary coil (30) is formed by winding a plurality of turns of conducting wires.

10. Coil assembly according to claim 9, wherein the core (10) comprises a plurality of successively connected core legs (11); the number of the secondary coils (30) is two, and each group of the secondary coils (30) are respectively wound on the two oppositely arranged magnetic core legs (11).

11. A pulse transformer, characterized in that it comprises a coil assembly according to any one of claims 1 to 10.

12. A medical device, characterized in that it comprises a pulse transformer according to claim 11.