KR102275643B1 - Transformer Using Induction Coils - Google Patents

Abstract

Provided, in accordance with one embodiment of the present disclosure, is a transformer comprising: a support core; a primary coil wound around the support core; a secondary coil wound around the support core, wherein at least one part of the secondary coil is disposed between the primary coils in a radially outward direction around the support core and at least one part of the primary coil is disposed between the secondary coils; and one or more magnetic cores disposed between the primary coils, between the secondary coils, or between the primary coil and the secondary coil. Therefore, a main objective of the present invention is to provide the transformer comprising the induction coil having an appropriate inductance while mitigating a proximity effect.

Description

Transformer Using Induction Coils

The present disclosure relates to a transformer including an induction coil.

The content described in this section merely provides background information for the present disclosure and does not constitute the prior art.

As is widely known, a transformer is an induction device that converts AC power of one winding (primary side) into AC power of the same frequency in the other winding (secondary side) by magnetic induction through a magnetic field. refers to Usually the primary winding is connected to the power supply and the secondary winding is connected to the load.

1 is a view showing a winding structure of a conventional transformer.

Referring to FIG. 1 , a conventional transformer 1 ′ includes a support core 10 , a primary coil 11 , and a secondary coil 12 . For convenience of description, other components other than those for describing the winding method of the transformer 1' are omitted. In the conventional transformer 1 ′, the primary coil 11 is wound around the support core 10 so as to surround at least a part of the support core 10 . After the primary coil 11 is wound by the target number of turns, the secondary coil 12 is wound around the support core 10 . That is, in the conventional transformer 1', it is common that the primary coil 11 and the secondary coil 12 are sequentially wound in time series.

On the other hand, there is a case where a high-frequency voltage of 10 kHz or more flows through the transformer 1'. The high-frequency current is concentrated on the surface of the conductor, that is, the wound primary coil 11 by the skin effect, and the primary coil 11 has high-frequency resistance. When the primary coil 11 is present in proximity to the secondary coil 12, which is another conductor, to increase the magnetic flux density in the space between the two, the high-frequency current flows more concentratedly than in the part close to the secondary coil 12. This is called the proximity effect and increases the high-frequency resistance of the conductor. Accordingly, there is a problem in that the total resistance of the conventional transformer 1' increases while the amount of heat generated by the transformer 1' increases.

) 값은 캐패시터의 캐패시턴스(C) 값과 유도코일의 누설 인덕턴스(L) 값으로 결정된다. 이때, 상용의 캐패시터의 C 값은 일정한 범위로 제한된다. 따라서, L값을 조정함으로써,

을 만족시키게 된다. 이에, 유도코일의 권취 방식 또는 구조에 따라 L값을 조정하는 것이 일반적이다. 그러나, 유도코일의 권취 방식 또는 구조 설계에 있어서, 여러가지 요인으로 인한 제약 조건이 존재한다. The transformer 1' can resonate, and the resonant frequency (

) value is determined by the capacitance (C) value of the capacitor and the leakage inductance (L) value of the induction coil. At this time, the C value of the commercial capacitor is limited to a certain range. Therefore, by adjusting the L value,

will satisfy Therefore, it is common to adjust the L value according to the winding method or structure of the induction coil. However, in the winding method or structural design of the induction coil, there are constraints due to various factors.

That is, there is a need for a transformer design having a limited leakage inductance value while solving the heating effect due to the proximity effect.

Accordingly, a main object of the present disclosure is to provide a transformer including an induction coil having an appropriate inductance while mitigating the proximity effect.

In addition, the present disclosure has a main purpose to provide a transformer winding method for winding a coil with a minimum number of turns.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

Accordingly, a main object of the present disclosure is to provide a winding assembly for a transformer having an appropriate inductance while mitigating the proximity effect.

In addition, the present disclosure has a main purpose to provide a transformer winding method for winding a coil with a minimum number of turns.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

1 is an understanding view showing a winding structure of a conventional transformer.
2 is a perspective view of a transformer according to an embodiment of the present disclosure.
3 is an understanding view showing a winding structure of a coil according to an embodiment of the present disclosure.
4 is a longitudinal cross-sectional view taken along IV-IV' of a winding configuration of a coil according to an embodiment of the present disclosure.
5 is an exploded perspective view showing a state in which a coil of a transformer is deployed in a plane according to an embodiment of the present disclosure.
6 is an enlarged bottom view of a transformer showing a connection state of a secondary coil according to an embodiment of the present disclosure.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to components in each drawing, it should be noted that the same components are given the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present disclosure, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present disclosure, the detailed description thereof will be omitted.

In describing the components of the embodiment according to the present disclosure, reference numerals such as first, second, i), ii), a), b) may be used. These signs are only for distinguishing the elements from other elements, and the nature, order, or order of the elements are not limited by the signs. When a part in the specification 'includes' or 'includes' a certain component, it means that other components may be further included, rather than excluding other components, unless explicitly stated to the contrary. .

In the present disclosure, for convenience of description, components other than components for describing the winding method of the coil of the transformer 1, for example, a power supply unit, a capacitor, and the like are omitted.

2 is a perspective view of a transformer according to an embodiment of the present disclosure. 3 is a cross-sectional view illustrating a winding configuration of a coil according to an embodiment of the present disclosure.

2 and 3, the transformer 1 includes a support core 10, a primary coil 20, a secondary coil 30, a magnetic core 40, an insulating thin film (not shown) and an electrode 60. includes all or part of it.

The support core 10 is disposed at the center of the transformer 1 . The support core 10 may be configured in a form in which steel plates are stacked in order to prevent loss due to eddy current while providing sufficient support force. A primary coil 20 and a secondary coil 30 of approximately thin plate shape may be sequentially stacked and wound on the support core 10 .

The primary coil 20 is wound around the support core 10 . The primary coil 20 may be electrically connected to the input part by attaching the electrodes 60a and 60b to the ends thereof.

The secondary coil 30 is also wound around the support core 10 . At least a portion of the secondary coil 30 is disposed between the primary coil 20 and the adjacent primary coil 20 in a radially outward direction with respect to the support core 10 . That is, at least some of the wound coils of the transformer 1 may be arranged such that the primary coil 20 and the secondary coil 30 are alternately stacked or wound with each other. Referring to FIG. 2 , at least a portion of a portion on which the coil is wound is a coil of the same type, for example, the primary coil 20 and the primary coil 20 or the secondary coil 30 and the secondary coil 30 are stacked or continuous. can be wound up. That is, the primary coil 20 may include a portion continuously wound in a radially outward direction, and may include a portion in which the secondary coil 30 is continuously wound in a radially outward direction. In the illustrated embodiment, only the secondary coil 30 has been illustrated as including such a portion. Whether or not there is a region in which only the secondary coil 30 is wound is determined by the ratio of the target number of turns of the primary coil 20 and the target number of turns of the secondary coil 30 , that is, the turns ratio.

When the target number of turns of the primary coil 20 is m, the target number of turns of the secondary coil 30 is n, the quotient obtained by dividing n by m is x, and the remainder obtained by dividing n by m is y, Equation 1 holds .

에 대해, 수학식 2가 성립한다. In addition, the total number of turns is the T variable

, Equation 2 holds.

는 n 및 m의 관계에 따라 변하는 값으로, 0 또는 1이 된다. y가 x의 정수배에 해당하는 경우,

의 값은 0이 될 것이다. y가 x의 정수배에 해당하지 않는 경우,

의 값은 1이 될 것이다. In this case, the variable

is a value that varies depending on the relationship between n and m, and is 0 or 1. If y is an integer multiple of x, then

The value of will be 0. If y is not an integer multiple of x,

The value of will be 1.

In this case, [x] means the maximum integer that does not exceed x.

In order to minimize T, the secondary coil 30 includes first to xth secondary coils.

인 경우를 일 예시적으로 본 개시의 권취 방법을 설명한다. 수학식 3은

일 때 수학식 1 및 수학식 2의 방식으로 나타낸 것이다.

A case in which the winding method of the present disclosure is described as an example. Equation 3 is

It is shown in the manner of Equations 1 and 2 when .

At this time, x=2, y=3.

The secondary coil 30 includes a first secondary coil 32 (refer to FIGS. 4 and 5) and a second secondary coil 34 (refer to FIGS. 4 and 5). The first secondary coil 32 and the second secondary coil 34 are disposed to be spaced apart from each other, and disposed to be stacked with the primary coil 20 . The primary coil 20 and the secondary coil 30 are wound simultaneously, and the total number of turns at that time becomes 7 turns. At this time, the secondary coil 30 should be wound three more turns. The secondary coil 30 includes a first secondary coil 32 and a second secondary coil 34 . Two turns among the three turns may be additionally wound by the first secondary coil 32 , and the remaining one turn may be wound by the second secondary coil 34 . In more detail, the additional winding portion of the first secondary coil 32 and the second secondary coil 34 may be simultaneously wound by one turn at the point before the turn at the same time as the primary coil 20 . One last turn is additionally wound in the first secondary coil (32). At this time, the first secondary coil 32 is possible in both the area before or after the primary coil 20 is wound. Accordingly, the total number of turns of the coil required to manufacture the transformer 1 is 9 turns.

일 경우, 즉,

의 정수배에 해당할 경우, 추가 턴은 필요 없으므로 총 턴수

이 될 수 있다. 이러한 경우, 도 3에서 도시된 것과는 달리, 임의의 이차코일(30)과 가장 인접한 코일이 이차코일(30)인 부분, 즉, 이차코일(30)만으로 구성된 영역은 형성되지 않게 된다.if

If , that is,

If it is an integer multiple of , no additional turns are required, so the total number of turns

this can be In this case, unlike the one illustrated in FIG. 3 , a portion in which the secondary coil 30 and the coil closest to any secondary coil 30 is the secondary coil 30 , that is, a region composed of only the secondary coil 30 is not formed.

The secondary coil 30 may be electrically connected to the output unit by attaching the electrodes 60c and 60d to the ends thereof.

The proximity effect becomes more pronounced as the cross-sectional area of the conductor increases. The primary coil 20 and the secondary coil 30 are wound simultaneously in time series and alternately arranged. That is, the cross-sectional area of the conventional transformer 1' is determined by the cross-section of the multi-layer winding section, but in the transformer 1 according to the present disclosure, the cross-sectional area of the conductor is equal to the longitudinal cross-sectional area of the single-layer coil. . Due to this, the proximity effect of the transformer 1 can be effectively solved, and the heat generation problem of the transformer 1 can be alleviated. For example, the temperature of the transformer 1 manufactured by this winding method may be preferably 80°C to 100°C.

) 값을 만족하기 위한 전체 인덕턴스 값이 형성되지 않는 문제가 발생할 수 있다. 이러한 문제를 방지하기 위하여, 본 개시에 의한 변압기(1)는 자성체 코어(40)를 포함할 수 있다.As the opposing area of the primary coil 20 and the secondary coil 30 increases, the proximity effect and leakage inductance tend to decrease at high frequencies. That is, the transformer 1 according to the present disclosure has a structure in which the facing area is greatly increased by overlapping and winding. Accordingly, the leakage inductance of the transformer 1 may converge to zero. Accordingly, the resonance frequency (

), there may be a problem that the total inductance value to satisfy the value is not formed. In order to prevent this problem, the transformer 1 according to the present disclosure may include a magnetic core 40 .

The magnetic core 40 is configured to artificially generate an inductance corresponding to a leakage inductance L value generated in the transformer 1 ′ shown in FIG. 1 . The leaked magnetic field may be concentrated along the magnetic core 40 . To this end, the magnetoresistance of the magnetic core 40 should be smaller than the magnetoresistance of air. Due to the magnetic field concentrated in the magnetic core 40, the induction transformer 1 has an inductance value for the resonant circuit to have a resonant frequency (f) value.

Accordingly, the transformer 1 can solve the problem due to the proximity effect due to the simultaneous winding of the primary coil 20 and the secondary coil 30 , and includes the magnetic core 40 , so that the appropriate inductance can satisfy the resonance frequency. can cause

The magnetic core 40 may extend in a direction parallel to the central axis around which the primary coil 20 is wound, that is, the winding axis. Further, the magnetic core 40 may have a width such that the transformer 1 includes one or more ducts 70 through which air or a magnetic field may pass between the coils adjacent to each other.

)를 만족하는 인덕턴스(L) 값을 갖게 된다.The magnetic core 40 may be disposed such that at least one surface faces at least one of the primary coil 20 and the secondary coil 30 . Accordingly, a magnetic field generated from either the primary coil 20 or the secondary coil 30 may be concentrated into the magnetic core 40 . Accordingly, the flux linkage formed in the magnetic core 40 increases, and the inductance increases in proportion to the increased magnetic flux. Accordingly, the transformer 1 has a resonance frequency (

) has an inductance (L) value that satisfies the

The magnetic core 40 may include a notch portion 42 . The notch 42 may extend along the height direction of the magnetic core 40 . At least a portion of the notch 42 is preferably formed on a surface facing the primary coil 20 or the secondary coil 30 . Accordingly, heat radiated from the primary coil 20 or the secondary coil 30 may be discharged. However, the present disclosure is not limited thereto, and the direction of the notch may be variously arranged according to the winding structure of the transformer 1 .

A duct 70 may be formed between adjacent coils due to the magnetic core 40 . The duct 70 preferably has a width sufficient to allow air and magnetic fields to pass therethrough. Air heated by the primary coil 20 and the secondary coil 30 may be discharged through the duct 70 . Accordingly, excessive heat generation of the transformer 1 can be effectively prevented.

The magnetic core 40 may be formed of a ferrite core. When the ferrite core is close to the conductor, the inductance of the conductor increases.

A plurality of magnetic cores 40 may be disposed between adjacent coils. In this case, the plurality of magnetic cores 40 are disposed to be spaced apart from each other. The spacing and the number of magnetic cores 40 may be appropriately designed according to the value of the required inductance according to the value of the resonance frequency. However, the present disclosure is not limited to the shape, number, and arrangement of the magnetic core 40 , and may be designed in various ways according to the characteristics of the resonance circuit and the characteristics of the transformer.

An insulating thin film (not shown) may be disposed between the secondary coil 30 and the secondary coil 30 , or between the secondary coil 30 and the primary coil 20 . The surface of the primary coil 20 and the secondary coil 30 may be insulated with enamel or the like, but may not be completely electrically insulated. By inserting an insulating thin film (not shown) between adjacent coils, a short circuit or interference between the coils can be effectively prevented. On the other hand, although specific dimensions or shapes of the insulating thin film are not shown in the present disclosure, the shape and arrangement method of the insulating thin film may be appropriately employed by those skilled in the art.

The electrode 60 includes primary side electrodes 60a and 60b and secondary side electrodes 60c and 60d connected to the primary side. An input voltage may be applied through the primary side electrodes 60a and 60b, and an output voltage may be transmitted to the load side through the secondary side electrodes 60c and 60d.

4 is a longitudinal cross-sectional view taken along IV-IV' of a winding configuration of a coil according to an embodiment of the present disclosure. 5 is an exploded perspective view showing a state in which a coil of a transformer is deployed in a plane according to an embodiment of the present disclosure. 6 is an enlarged bottom view of a transformer showing a connection state of a secondary coil according to an embodiment of the present disclosure. Meanwhile, in FIG. 4 , the electrode 60 is omitted.

인 경우를 가정하여 설명하며, 반드시 이에 한정되지 않고

과

이 정수비로 이루어진 모든 경우에 대하여 적용될 수 있다.4 and 5, the structure of the transformer 1 according to the present disclosure will be described in detail. On the other hand, in this embodiment,

The description is made on the assumption that , and is not necessarily limited thereto

and

It can be applied to all cases consisting of this integer ratio.

을 일차코일(20)의 목표 턴수

으로 나눈 몫

는 2이다. 따라서, 이차코일(30)은 제1 이차코일(32) 및 제2 이차코일(34)로 구성된다. 한편,

가 3일 경우, 이차코일(30)은 제3 이차코일(미도시)을 더 포함할 수 있다. The primary coil 20 and the secondary coil 30 may be sequentially stacked and wound. At this time, the target number of turns of the secondary coil (30)

is the target number of turns of the primary coil (20)

share divided by

is 2 Accordingly, the secondary coil 30 includes the first secondary coil 32 and the second secondary coil 34 . Meanwhile,

When is 3, the secondary coil 30 may further include a third secondary coil (not shown).

을

으로 나눈 나머지

는 3이다. 이때,

를

로 나눈 몫은 1이다. 제1 이차코일(32)과 제2 이차코일(34)에서 각각 1턴을 동시에 권취해, 이차코일(30) 전체적으로 총 2턴이 더 추가된다. 이로써, 이차코일은 총 16턴이 권취된다. 마지막 1턴은 제1 이차코일(32) 혹은 제2 이차코일 중 어느 하나의 코일에서 권취될 수 있다. 도 4 및 도 5에서는 일차코일(20) 및 이차코일(30)이 모두 권취된 후, 마지막으로 1턴이 제1 이차코일(32)에서 더 권취되는 것으로 도시된다. 그러나 본 개시는 이에 한정되지 않고, 남은 턴이 제1 이차코일(32) 내지 제x 이차코일(미도시) 중 어느 하나에서 배분되어 적절하게 권취될 수 있다. 일차코일(20) 및 이차코일(30)이 동시에 권취되므로, 최소한의 턴수로 변압기(1)가 제조될 수 있다. 따라서, 변압기(1)의 제조 효율이 증대되는 효과가 있다.

of

remainder divided by

is 3 At this time,

to

The quotient divided by is 1. 1 turn is wound simultaneously in each of the first secondary coil 32 and the second secondary coil 34 , and a total of two more turns is added to the overall secondary coil 30 . Thereby, the secondary coil is wound a total of 16 turns. The last one turn may be wound in any one of the first secondary coil 32 or the second secondary coil. In FIGS. 4 and 5 , after both the primary coil 20 and the secondary coil 30 are wound, one turn is shown to be further wound by the first secondary coil 32 . However, the present disclosure is not limited thereto, and the remaining turns may be distributed in any one of the first secondary coil 32 to the xth secondary coil (not shown) to be appropriately wound. Since the primary coil 20 and the secondary coil 30 are wound at the same time, the transformer 1 can be manufactured with a minimum number of turns. Accordingly, there is an effect that the manufacturing efficiency of the transformer 1 is increased.

The primary coil 20 has a first width L1, and the first secondary coil 32 has a second width L2. The second width L2 may be equal to or longer than the first width L1 . In this case, the difference between the first width L1 and the second width L2 will be as much as the length to be additionally wound.

A method of connecting the secondary coil 30 according to the present disclosure will be described with reference to FIGS. 5 and 6 .

As described above, in order for the secondary coil 30 to become 17 turns, the first secondary coil 32 and the second secondary coil 34 must be electrically connected. Accordingly, the first secondary coil 32 includes a first inner terminal formed at one end in a radially inward direction with respect to the support core 10 and a first outer terminal 320 formed at the other end in a radially outward direction. The second secondary coil 34 also includes a second inner terminal 340 and a second outer terminal 342 . The first outer terminal 320 and the second inner terminal 340 may be connected in series. For this reason, the secondary coil 30 may have a total of 17 turns by serial connection of the first primary coil 20 wound by 9 turns and the second secondary coil 34 wound by 8 turns.

The first outer terminal 320 includes a first outer protrusion 322 protruding in a direction parallel to the winding axis of the secondary coil 30 with respect to the winding direction of the secondary coil 30 .

The second inner terminal 340 includes a second inner protrusion 344 protruding in a direction parallel to the winding axis of the secondary coil 30 with respect to the winding direction of the secondary coil 30 .

The first outer protrusion 322 and the second inner protrusion 344 are connected through a conductive wire 50 . The conductive wire 50 may be connected while crossing the coils based on the winding direction of the coils in a state in which the primary coil 20 and the secondary coil 30 are wound.

At least a portion of the first outer protrusion 322 and the second inner protrusion 344 may be configured as a mold busbar.

On the other hand, when the secondary coil 30 further includes a third secondary coil (not shown), the second outer protrusion (not shown) and the third inner protrusion (not shown) include the first outer protrusion 322 and the second The inner protrusion 344 may be connected in a connected manner.

The above description is merely illustrative of the technical idea of this embodiment, and various modifications and variations will be possible by those skilled in the art to which this embodiment belongs without departing from the essential characteristics of the present embodiment. Accordingly, the present embodiments are intended to explain rather than limit the technical spirit of the present embodiment, and the scope of the technical spirit of the present embodiment is not limited by these embodiments. The protection scope of the present embodiment should be interpreted by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present embodiment.

1: Transformer 10: Supporting core
20: primary coil 30: secondary coil
32: first secondary coil 34: second secondary coil
40: magnetic core 50: conducting wire
60: electrode 70: duct
1': conventional transformer
L1: first length L2: second length

Claims (15)

support core;
a primary coil wound around the support core;
a secondary coil wound around the support core; and
one or more magnetic cores disposed between the primary coils, between the secondary coils, or between the primary coil and the secondary coil;
including,
At least a portion of the secondary coil is disposed between the primary coil in a radially outward direction with respect to the support core,
A transformer including an induction coil, characterized in that at least a portion of the primary coil is disposed between the secondary coils. According to claim 1,
The secondary coil includes a first secondary coil and a second secondary coil,
The second secondary coil is parallel to the first secondary coil and the transformer including an induction coil, characterized in that it is spaced apart in the winding axis direction. 3. The method of claim 2,
The secondary coil includes a third secondary coil,
The third secondary coil is parallel to the second secondary coil and is spaced apart from each other in the direction of the winding shaft. 4. The method of claim 3,
The first secondary coil includes a first outer terminal formed in a radially outward direction at one end,
The second secondary coil includes a second inner terminal formed in a radially inward direction at one end and a second outer terminal formed in a radially outward direction at the other end,
A transformer including an induction coil, characterized in that the first outer terminal and the second inner terminal are electrically interconnected. 5. The method of claim 4,
The first secondary coil includes a first outer protrusion, at least a portion of which protrudes in a direction parallel to the winding shaft of the secondary coil,
The second inner terminal includes a second inner protrusion, at least a portion of which protrudes in a direction parallel to the winding shaft of the secondary coil,
A transformer including an induction coil, characterized in that the first outer protrusion and the second inner protrusion are connected to each other by conducting wires. 6. The method of claim 5,
A transformer including an induction coil, characterized in that the conducting wire crosses the secondary coil with respect to the winding direction of the secondary coil. 6. The method of claim 5,
At least one of the first outer protrusion and the second inner protrusion includes a mold busbar. According to claim 1,
The magnetic core extends in a direction parallel to the winding axis of the primary coil,
Transformer comprising an induction coil, characterized in that it comprises one or more ducts formed by the magnetic core. According to claim 1,
The magnetic core is a transformer including an induction coil, characterized in that at least part of the ferrite core. According to claim 1,
At least one surface of the magnetic core is opposite to at least one of the secondary coil and the primary coil. According to claim 1,
The magnetic core is a transformer including an induction coil, characterized in that it comprises a notch extending parallel to the winding shaft on at least one surface facing the primary coil or the secondary coil. 12. The method according to any one of claims 7 to 11,
A transformer including an induction coil, characterized in that when the magnetic core is arranged in plurality, the coils are arranged to be spaced apart from each other along a winding direction. According to claim 1,
Further comprising an insulating thin film wound around the support core and configured to block electrical and magnetic interference between neighboring coils,
At least a portion of the insulating thin film is disposed between the primary coil and the secondary coil, or between the secondary coil and an adjacent secondary coil. According to claim 1,
When the target number of turns of the primary coil is m, the target number of turns of the secondary coil is n, and the quotient obtained by dividing the n by the m is x,
The secondary coil includes first to x-th secondary coils,
The total number of turns is T, the remainder of dividing the n by the m is y, the variable is

When you say

A transformer including an induction coil, characterized in that it satisfies the equation of 15. The method of claim 14,
The α is a transformer including an induction coil, characterized in that 0 or 1.

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