KR20040025036A - Mold-style case structure for a secondary-coil in transformer for neon-tube - Google Patents

Mold-style case structure for a secondary-coil in transformer for neon-tube Download PDF

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Publication number
KR20040025036A
KR20040025036A KR1020020056828A KR20020056828A KR20040025036A KR 20040025036 A KR20040025036 A KR 20040025036A KR 1020020056828 A KR1020020056828 A KR 1020020056828A KR 20020056828 A KR20020056828 A KR 20020056828A KR 20040025036 A KR20040025036 A KR 20040025036A
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South Korea
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case
transformer
coil
insulating resin
secondary coil
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KR1020020056828A
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Korean (ko)
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김봉균
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주식회사 대한트랜스
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Priority to KR1020020056828A priority Critical patent/KR20040025036A/en
Publication of KR20040025036A publication Critical patent/KR20040025036A/en

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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
    • H01F27/022—Encapsulation
    • 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
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/327—Encapsulating or impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F38/08—High-leakage transformers or inductances

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulating Of Coils (AREA)

Abstract

PURPOSE: A structure of a mold case for secondary coil of a transformer of a neon tube is provided to prevent an accident due to the electric shock by installing respectively the secondary coils in a separative upper case and a separative lower case, forming a common line within the cases, and filling the cases with the insulating resin. CONSTITUTION: A structure of a mold case for secondary coil of a transformer of a neon tube includes an upper case(1) and a lower case(2). An outer stopper(11), a fixing groove(12), a plurality of inner walls(13,14), a bottom plate(15), a supporting projection(16), and a protective part(18) having a drawing groove(17) are formed at the upper case(1). An inner stopper(21), a fixing projection(22), a plurality of outer walls(23,24), a bottom plate(25), a supporting projection(26), and a protective part(28) having a drawing groove(27) are formed at the lower case(2). The upper case(1) includes a fixing part(19) and a connection part. The lower case(2) includes an insulating resin injection hole(29a) and an air discharging hole(29b).

Description

네온관용 변압기의 2차 코일용 몰드형 케이스의 구조 {Mold-style case structure for a secondary-coil in transformer for neon-tube}Mold-style case structure for a secondary-coil in transformer for neon-tube}

본발명은 네온관용 변압기의 2차코일용 몰드형케이스의 구조에 관한 것으로, 특히 상부가 개방되도록 내외벽을 형성시킨 사각통형의 상하부 케이스 내에 2차코일을 수납하여 그 공통선을 내부에서 연결한 후 절연수지로 상기 상하부케이스 내부를 충전시킴으로써, 절연효율향상과 전압누출방지에 의한 제품의 전기적 성능향상과 수명연장을 구현하고, 구성의 단순화에 의해 제작 및 조립공수 절감과 생산성향상 및 수율증대를 도모하게 된 것이다.The present invention relates to the structure of the mold case for the secondary coil of the neon tube transformer, and in particular, the secondary coil is stored in the upper and lower cases of the rectangular cylindrical shape in which the inner and outer walls are formed so that the upper part is opened, and then the common lines are connected inside. By filling the upper and lower casings with insulating resin, the product improves electrical efficiency and lifespan by improving insulation efficiency and preventing voltage leakage, and by simplifying the construction, it is possible to reduce manufacturing and assembly labor, improve productivity, and increase yield. It is done.

일반적으로, 네온사인(Neon Sign)은 저압가스 속의 글로방전(glow discharge)을 이용한 방전등(放電燈)으로, 네온관등은 방전 개시전압이 높고, 방전 중의 필요전압이 낮다는 부특성(負特性)을 가지고 있으므로 네온관용 변압기는 무부하 전압이 높고 방전전류가 흐르면 전압이 현저하게 저하되는 성질을 가질 필요가 있기 때문에 자기누설변압기라고 하는 특수한 구조의 것을 사용한다.In general, neon sign is a discharge lamp using a glow discharge in a low pressure gas, a neon tube lamp has the characteristics of high discharge start voltage and low required voltage during discharge. Neon tube transformer has special structure called magnetic leakage transformer because it needs to have the property of high no-load voltage and remarkably lower voltage when discharge current flows.

즉, 1차.2차 코일을 가진다는 것은 일반 변압기와 같지만, 철심(鐵心)의 구성을 연구하여 2차 코일에 전류가 흐를 때, 이것에 의한 자속(磁束)의 대부분이 누설자속이 되게 하며, 이 경우 2차 전류가 흐르면 누설 리액턴스가 강하하기 때문에 2차 전압이 현저하게 저하되도록 하는데, 극단적인 상태로서, 2차를 단락해도 단락전류는 코일이 소손(燒損)될 만한 대전류가 흐르지 않게 되고, 통상적으로 네온변압기의 2차 무부하전압은 15,000V 이하이고, 2차를 단락했을 때의 단락전류는 50mA이하로 되어 있다.In other words, having a primary or secondary coil is the same as a general transformer, but studies the configuration of the iron core so that when the current flows in the secondary coil, most of the magnetic flux caused by this becomes a leakage magnetic flux. In this case, the secondary reactance drops because the leakage reactance drops when the secondary current flows. In an extreme state, even if the secondary is shorted, the short-circuit current prevents the large current from flowing through the coil. Normally, the secondary no-load voltage of the neon transformer is 15,000 V or less, and the short-circuit current when the secondary is shorted is 50 mA or less.

그리고, 2차코일은 'ㅌ'형 코어체의 중앙 철심에 끼워져 코어체의 유도에 의하여 전압을 발생하게 되는데, 두 개의 2차코일이 상호작용을 하여 출력전압 특성을 변화시켜 원하는 전압특성을 얻지 못하게 됨에 따라, 두 개의 2차 코일을 절연체로 보호하여 원하는 특성을 갖는 출력전압을 얻게 된다.In addition, the secondary coil is inserted into the center iron core of the '체' type core body to generate a voltage by induction of the core body, and the two secondary coils interact to change the output voltage characteristics to obtain the desired voltage characteristics. As a result, the two secondary coils are protected with an insulator to obtain an output voltage with the desired characteristics.

도6은 종래 2차코일용 케이스의 구성을 예시한 것으로, 내,외벽(31,32)이 형성되고 차단판(33)에 의해 2차코일이 수납되는 제1수납공간부(34)가 형성되며, 외면 일측에 출력선인출 및 고정을 위한 인출홈(35)및 고정구(36)를 형성시킨 원통형의 케이스(3)와 ;FIG. 6 illustrates a configuration of a conventional secondary coil case, in which inner and outer walls 31 and 32 are formed, and a first storage space 34 in which secondary coils are accommodated by a blocking plate 33 is formed. A cylindrical case 3 having a drawing groove 35 and a fixture 36 for output line drawing and fixing on one side of an outer surface thereof;

내.외벽(41,42)에 의해 제2수납공간부(43)가 형성되어 상기 케이스(3)의 상하부를 복개시키는 제1,2커버(4a,4b)로 구성된다.A second storage space portion 43 is formed by the inner and outer walls 41 and 42, and includes first and second covers 4a and 4b for covering the upper and lower portions of the case 3.

그러나, 상기한 종래 2차 코일용 케이스에서는 조립이 완료된 후 케이스(3)의 내부로 액상의 절연수지를 주입할 경우, 절연수지가 경화되기 전에 케이스(3)외면에 형성된 인출홈(35)등을 통해 절연수지 누설이 발생되는 문제점이 지적되고 있다. 상기한 문제점은 케이스(3)의 내부에 절연수지가 충분히 채워지지 않게됨을 의미하며, 따라서 2차코일간의 상호작용에 의한 전압누출 및 제품의 수명을 단축시키는 주요인을 제공하게 됨은 물론, 두개의 2차코일 공통선이 케이스(3)의 외부에 노출된 상태로 연결되므로, 단선 또는 감전사고 발생우려가 상존하게 된다는 또다른 문제점을 유발하게 된다.However, in the case of the conventional secondary coil case when injecting the liquid insulating resin into the case 3 after the assembly is completed, the withdrawal groove 35 formed on the outer surface of the case 3 before the insulating resin is cured It is pointed out that the problem of insulating resin leakage through. The above problem means that the insulation resin is not sufficiently filled in the case 3, and thus, the main reason is to provide a main factor of shortening the life of the product and voltage leakage due to the interaction of the secondary coil. Since the common coil common wire is exposed to the outside of the case 3, another problem that the disconnection or electric shock is likely to be present.

본 발명은 상기한 문제점들을 감안하여 2차코일이 독립된 케이스내에 각각 수납되게 하고, 그 공통선이 케이스 내에서 연결되도록 하며, 케이스의 내부를 절연수지로 완전히 충전되도록 함으로써, 전압누출 방지에 의한 전기적 성능향상과제품의 수명연장을 구현할 수 있게된 네온관용 변압기의 2차코일용 몰드형케이스의 구조를 제공함에 그 목적이 있다.In view of the above-described problems, the present invention allows secondary coils to be housed in separate cases, the common lines are connected in the case, and the inside of the case is completely charged with an insulating resin, thereby preventing electrical leakage. The purpose of the present invention is to provide a structure of a molded case for the secondary coil of the neon tube transformer that can realize the performance improvement and the life of the product.

상기 목적을 효과적으로 달성하기 위하여 본 발명에서는 상,하로 대응결합하는 상,하케이스의 외측에 인출홈을 포함하는 보호구를 형성시켜 공통선을 상하케이스의 내부에서 연결시키도록 하고, 상기 하부 케이스의 외면에는 절연수지 주입구와 공기 배출구를 형성시켜 줌으로써 단선 및 감전사고 우려를 미연에 방지함과 동시에 제품의 품질향상과 수명연장이 구현되도록 하였다.In order to effectively achieve the above object, the present invention forms a protective device including a drawing groove on the outer side of the upper and lower cases corresponding to the upper and lower sides so as to connect the common line in the upper and lower cases, and the outer surface of the lower case. Insulation resin inlet and air outlet were formed to prevent disconnection and electric shock, while improving product quality and lifespan.

도 1은 본 발명에 의한 케이스의 분해 사시도.1 is an exploded perspective view of a case according to the present invention.

도 2는 본 발명에 의한 케이스의 분해 사시도.Figure 2 is an exploded perspective view of the case according to the present invention.

도 3은 도 2의 A부 확대 단면도.3 is an enlarged cross-sectional view of portion A of FIG.

도 4는 도 2의 B부 확대 단면도.4 is an enlarged cross-sectional view of portion B of FIG. 2;

도 5는 본 발명에 의한 케이스의 사용상태도.5 is a use state of the case according to the present invention.

도 6은 종래 케이스의 구성 예시도.6 is a diagram illustrating a configuration of a conventional case.

- 도면의 주요부분에 대한 상세한 설명 -Detailed description of the main parts of the drawings

1 : 상부케이스 2 : 하부케이스 3 : 케이스 4a,4b : 제1,2커버DESCRIPTION OF SYMBOLS 1 Upper case 2 Lower case 3 Cases 4a and 4b 1st and 2nd cover

5a,5b : 출력선 11 : 외측걸림턱 12 : 고정요홈 15,25 : 분판5a, 5b: Output line 11: Outer locking jaw 12: Fixing recess 15,25: Separation

15a : 연결공 17,27 :인출홈 18,28 : 보호구 19 : 고정구15a: connection hole 17,27: withdrawal groove 18,28: protective equipment 19: fixture

21 : 내측걸림턱 22: 고정돌기 29a : 절연수지 주입구21: internal locking jaw 22: fixing projection 29a: insulated resin inlet

29b : 공기배출구29b: air outlet

이하에서 상기 본발명의 바람직한 구성예를 첨부도면에 의해 상세히 설명한다.Hereinafter, the preferred configuration of the present invention will be described in detail by the accompanying drawings.

도 1은 본발명에 의한 2차코일용 케이스의 분해사시도로서, 도2에서는 그 조립상태를 단면도로 나타내었고, 도 3 및 도 4는 도2의 A,B부를 확대단면도로 나타내었으며, 도 5는 본발명에 의한 2차코일용 케이스의 사용상태를 나타내었다.1 is an exploded perspective view of a case for a secondary coil according to the present invention. In FIG. 2, an assembled state thereof is illustrated in a cross-sectional view, and FIGS. 3 and 4 are enlarged cross-sectional views of parts A and B of FIG. Shows the state of use of the secondary coil case according to the present invention.

본 발명 2차 코일용 케이스는, 외측걸림턱(11)과 내측걸림턱(21)에 의해 적층되어 고정요홈(12)과 고정돌기(22)에 의해 대응결합되고, 내,외벽(13,14,23,24)의 저부를 연결하는 밑판(15,25)의 복수개소에 받침턱(16,26)이 형성되며, 상기 외벽(14,24)의 일측에는 내향개구된 인출홈(17,27)을 포함하는 보호구(18,28)를 형성시킨 상,하부 케이스(1,2)로 구성되고 ;The secondary coil case of the present invention is laminated by the outer locking jaw 11 and the inner locking jaw 21 and correspondingly coupled by the fixing recess 12 and the fixing protrusion 22, and the inner and outer walls 13 and 14. Supporting jaw (16, 26) is formed in a plurality of places of the bottom plate (15, 25) connecting the bottom of the, 23, 24, the inlet openings 17, 27 inwardly opened on one side of the outer wall (14, 24) It consists of the upper and lower cases (1, 2) formed protective equipment (18, 28) including;

상기 상부케이스(1)는, 외벽(14)의 외측에 돌출형성시킨 고정구(1)와 밑판(15)에 형성시킨 연결공(15a)을 구비하며; 상기 하부케이스(2)는, 외벽(24)의외면상부에 절연수지 주입구(29a)와 공기 배출구(29b)를 구비하여 된 것이다.The upper case (1) has a fastener (1) protruding to the outside of the outer wall (14) and a connecting hole (15a) formed in the bottom plate (15); The lower case 2 is provided with an insulating resin inlet 29a and an air outlet 29b on the outer surface of the outer wall 24.

상기 상부본체(1)와 하부본체(2)는 내벽(13,23)과 외벽(14,24)을 갖는 중공의 사각통형으로서, 상부본체(1) 및 하부본체(2)의 내부에는 2차코일을 수납하는 안착부(1a,2a)를 마련하되, 밑면과 일정거리만큼 이격시키기위한 받침턱(1b,2b)을 밑판(15,25)에 형성하여 2차코일을 수납하며, 이때 상기 2차코일은 상부본체(1)와 하부본체(2)에 수월히 수납되도록 내벽(13,23)과 외벽(14,24)으로부터 일정거리만큼 이격되도록 한다.The upper body (1) and the lower body (2) is a hollow rectangular cylinder having an inner wall (13, 23) and the outer wall (14, 24), the inside of the upper body (1) and the lower body (2) The mounting parts 1a and 2a for accommodating the coil are provided, and the base jaws 1b and 2b are formed on the bottom plates 15 and 25 to be spaced apart from the bottom by a predetermined distance to accommodate the secondary coils. The car coil is spaced apart from the inner walls 13 and 23 and the outer walls 14 and 24 by a predetermined distance so as to be easily accommodated in the upper body 1 and the lower body 2.

상기 상부본체(1)와 하부본체(2)에 수남되는 2차코일의 출력선은 외벽(14,24)에 형성된 인출홈(17,27)으로 인출하며, 상기 인출홈(17,27)의 주위에는 2차코일의 출력선(5a,5b)을 보호하기 위한 보호구(18,28)를 형성하고, 상기 상부본체(1)에는 하부본체(2)의 인출홈(27)으로 인출된 2차코일의 출력선(5b)이 상부본체(1)의 외벽(14)에 고정될 수 잇도록 고정구(19)를 형성한다.The output lines of the secondary coils remaining in the upper main body 1 and the lower main body 2 are drawn out to the drawing grooves 17 and 27 formed in the outer walls 14 and 24, respectively. A protective device (18, 28) for protecting the output lines (5a, 5b) of the secondary coil is formed around the secondary body, the upper body (1) is drawn out to the withdrawal grooves 27 of the lower body (2) The fixture 19 is formed so that the output line 5b of the coil can be fixed to the outer wall 14 of the upper body 1.

이와같이 구성된 본발명 2차코일용 케이스는 상부본체(1)와 하부본체(2)를 결합함에 있어서, 상부케이스(1)와 하부케이스(2)에 수납되는 2차코일의 공통선을 연결하기 위하여, 상부케이스(1)의 내벽(13)에 근접하는 위치의 밑판(15)에 연결공(15a)이 형성되어, 하부케이스(2)에 수납되는 2차코일의 공통선을 연결공(15a)을 통과하여 상부케이스(1)에 수남되는 2차코일의 공통선과 연결시킨 후, 상부케이스(1)와 하부케이스(2)를 결합한다.The secondary coil case of the present invention configured as described above, in connecting the upper body (1) and the lower body (2), in order to connect the common line of the secondary coils stored in the upper case (1) and the lower case (2) The connection hole 15a is formed in the bottom plate 15 at a position close to the inner wall 13 of the upper case 1, and connects a common line of the secondary coils stored in the lower case 2 to the connection hole 15a. After passing through and connected with the common line of the second coil remaining in the upper case 1, the upper case 1 and the lower case 2 are combined.

이때, 상부케이스(1)와 하부케이스(2)가 일정높이를 갖으며 결합되도록 상부케이스(1)의 하측 외부와 하부케이스(2)의 상측 내부에 내,외측 걸림턱(11,21)이형성되며, 상부케이스(1)의 외측걸림턱(11) 하측에 고정요홈(12)이 형성되고 하부케이스(2)의 내측걸림턱(21)상측에 상기 고정요홈(12)과 대응하는 고정돌기(22)가 형성되어있으므로 상,하부케이스(1,2)는 견고히 조립된다.In this case, the inner and outer locking jaws 11 and 21 are formed in the lower outer side of the upper case 1 and the upper inner side of the lower case 2 so that the upper case 1 and the lower case 2 have a predetermined height. Fixing groove 12 is formed on the lower side of the outer engaging jaw (11) of the upper case (1) and the fixing projection corresponding to the fixing groove (12) above the inner engaging jaw (21) of the lower case ( Since 22) is formed, the upper and lower cases (1, 2) are firmly assembled.

한편, 상부케이스(1)와 하부케이스(2)가 결합된 후, 상부케이스(1)와 하부케이스(2)의 내부에 절연수지액을 주입하게 되는데, 하부케이스(2)의 외벽(24)상부에는 절연수지를 하부케이스(2)의 내부로 주입할 수 있도록 수지주입구(29a)가 형성되며, 절연수지가 주입됨에 따라 하부케이스(2)내의 공기가 외부로 배출되도록 하는 공기 배출구(29b)가 형성되어, 절연수지가 충분히 주입될 수 있도록 하며, 일정시간이 경과한 후에는 절연수지는 경화된다.Meanwhile, after the upper case 1 and the lower case 2 are combined, the insulating resin solution is injected into the upper case 1 and the lower case 2, and the outer wall 24 of the lower case 2 is provided. A resin inlet 29a is formed in the upper portion to inject the insulating resin into the lower case 2, and an air outlet 29b for discharging the air in the lower case 2 to the outside as the insulating resin is injected. Is formed so that the insulating resin can be sufficiently injected, and after a certain time has elapsed, the insulating resin is cured.

이상의 설명은 본발명의 일실시예로서 필요에 따라 기본 개념을 벗어나지 않는 범위내에서 다양한 변형이 가능함은 물론이다.The above description is one embodiment of the present invention, and of course, various modifications may be made without departing from the basic concept as necessary.

이상의 설명에서와 같이 본발명 2차코일용 케이스는 2차코일이 독립된 상,하부 케이스(1,2)내에 각각 수납되게 하고, 그 공통선이 내부에서 연결되도록 함으로써 단선 및 감전사고 우려를 근본적으로 해소시키고, 상기 상,하부케이스(1,2)의 내부에는 절연수지가 완전히 충전되도록 함으로써 제품의 품질향상과 수명연장을 적극적으로 구현하며, 전체적인 구성의 단순화에 의해 제작과 조립공수의 최소화와 생산성 및 수율증대를 도모할 수 있는 등의 효과가 있다.As described above, the secondary coil case of the present invention allows secondary coils to be housed in separate upper and lower cases (1, 2), respectively, and common lines thereof are connected internally, thereby causing a risk of disconnection and electric shock. To solve the problem, the upper and lower cases (1, 2) inside the insulating resin to be completely filled to actively implement the quality improvement and life extension of the product, by simplifying the overall configuration to minimize the production and assembly labor and productivity And yields can be increased.

Claims (1)

외측걸림턱(11)과 내측걸림턱(21)에 의해 적층되어 고정요홈(12)과 고정돌기(22)에 의해 대응결합되고, 내.외벽(13,14,23,24)의 저부를 연결하는 밑판(15,25)의 복부개소에 받침턱(16,26)이 형성되며, 상기 외벽(14,24)의 일측에는 내향개구된 인출홈(17,27)을 포함하는 보호구(18,28)를 형성시킨 상,하부 케이스(1,2)로 구성되고.Stacked by the outer locking jaw (11) and the inner locking jaw (21) is correspondingly coupled by the fixing groove 12 and the fixing projection 22, connecting the bottom of the inner and outer walls (13, 14, 23, 24) Supporting jaw (16, 26) is formed in the abdominal portion of the bottom plate (15, 25) to be, one side of the outer wall (14, 24), the protective device (18, 28) including an inwardly open draw-out groove (17, 27) ) Is formed of upper and lower cases (1, 2). 상기 상부케이스(1)는, 외벽(14)의 외측에 돌출형성시킨 고정구(19)와 밑판(15)에 형성시킨 연결공(15a)을 구비하며;The upper case (1) has a fixture (19) protruding on the outside of the outer wall (14) and a connecting hole (15a) formed in the bottom plate (15); 상기 하부케이스(2)는, 외벽(24)의 외면 상부에 절연수지 주입구(29a)와 공기 배출구(29b)를 구비하여서된 것을 특징으로 하는 네온관용 변압기의 2차 코일용 몰드형 케이스의 구조.The lower case (2), the structure of the molded case for the secondary coil of the neon tube transformer, characterized in that it is provided with an insulating resin inlet (29a) and the air outlet (29b) on the upper surface of the outer wall (24).
KR1020020056828A 2002-09-18 2002-09-18 Mold-style case structure for a secondary-coil in transformer for neon-tube KR20040025036A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100852618B1 (en) * 2006-11-30 2008-08-18 강명순 Current Transformer and the Metodthereof
WO2017175930A1 (en) * 2016-04-05 2017-10-12 엘에스산전 주식회사 Electronic device insulating structure
CN108806966A (en) * 2018-06-07 2018-11-13 伍尔特电子(深圳)有限公司 A kind of preparation method of transformer winding, transformer winding and transformer

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KR19980027747U (en) * 1996-11-19 1998-08-05 김봉균 Bobbin case structure for secondary coil winding of neon tube transformer
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KR20000012212U (en) * 1998-12-16 2000-07-05 김봉균 Output lead wire insulated connection of transformer for neon tube

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Publication number Priority date Publication date Assignee Title
KR910018892U (en) * 1990-04-26 1991-11-29 한국트랜스 주식회사 Neon transformer secondary high pressure winding bobbin
KR940001899U (en) * 1992-06-03 1994-01-03 주식회사 조일전자 Neon Transformer's Connection
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100852618B1 (en) * 2006-11-30 2008-08-18 강명순 Current Transformer and the Metodthereof
WO2017175930A1 (en) * 2016-04-05 2017-10-12 엘에스산전 주식회사 Electronic device insulating structure
CN108806966A (en) * 2018-06-07 2018-11-13 伍尔特电子(深圳)有限公司 A kind of preparation method of transformer winding, transformer winding and transformer

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