CN115691960A - Transformer - Google Patents

Abstract

The invention provides a transformer, which can inhibit the enlargement of the transformer and improve the vibration resistance. The inner core (16) is formed from a material containing a magnetic body, and is provided with a first flange section (161), a second flange section (162), and a core section (163). The core (163) extends in the vertical direction between the first flange section (161) and the second flange section (162). The conductive wire (17) is wound around the core (163). The outer core (15) is formed from a material containing a magnetic body, and is provided with a peripheral wall (151) that surrounds at least a portion of the first flange section (161) and the core section (163) from the left-right direction. The inner core (16) is a single piece part. The second flange (162) has a portion that faces the peripheral wall (151) in the vertical direction.

Description

Transformer device

Technical Field

The present invention relates to a transformer.

Background

Patent document 1 discloses a transformer including a first core, a second core, and a conductive wire. The first core has a first flange portion, a second flange portion, and a core portion extending in a first direction between the first flange portion and the second flange portion. The conductive wire is wound around the core. The second core has a wall portion surrounding at least a part of the first flange portion and the core portion from a second direction intersecting the first direction. The first core and the second core are formed of a material containing a magnetic body.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-004905

Disclosure of Invention

Problems to be solved by the invention

The purpose of the present invention is to improve vibration resistance while suppressing the size increase of a transformer.

Means for solving the problems

One aspect of the present invention to achieve the above object is a transformer including:

a first core having a first flange portion, a second flange portion, and a core portion extending in a first direction between the first flange portion and the second flange portion, and formed of a material including a magnetic body;

a conductive wire wound around the core; and

a second core having a wall portion surrounding the first flange portion and at least a part of the core portion from a second direction intersecting the first direction, and formed of a material containing a magnetic body,

the first core is a one-piece part,

the second flange portion has a portion opposed to the wall portion in the first direction.

According to the above configuration, the second flange portion of the first core and the wall portion of the second core can form a structure capable of suppressing leakage of magnetic flux generated from the coil to the outside. By suppressing leakage of magnetic flux to the outside, a decrease in inductance can be suppressed. Since there is no need to take measures to increase the number of turns of the conductive wire by estimating the amount of decrease in inductance, it is possible to suppress the size increase of the transformer.

Further, since the structure capable of suppressing leakage of magnetic flux to the outside is realized by the second flange portion which is a part of the first core which is a single component, it is not necessary to prepare another member dedicated to leakage suppression. This can further suppress an increase in size of the transformer, reduce the number of parts, and reduce the number of manufacturing steps, and can increase the strength of the structure against the influence of vibration applied from the outside.

As a result, the vibration resistance can be improved while suppressing an increase in size of the transformer.

Drawings

Fig. 1 illustrates an appearance of a transformer of an embodiment.

Fig. 2 illustrates an external appearance of a transformer of an embodiment.

Fig. 3 illustrates an external appearance of the above-described transformer with the outer shield case removed.

Fig. 4 illustrates an appearance of the above-described transformer with the inner shield case removed.

Fig. 5 illustrates an appearance of the above-described transformer with the outer core removed.

Fig. 6 illustrates an appearance of the above-described transformer as viewed from above.

Fig. 7 illustrates a cross section of the transformer viewed from the direction of the arrows along the line VII-II in fig. 6.

Fig. 8 illustrates a cross section of the transformer viewed from the direction of the arrows along the line VIII-III in fig. 6.

Fig. 9 shows another example of the structure of the inner core.

Fig. 10 is a perspective view illustrating an external design of a transformer according to an embodiment.

Fig. 11 is a front view illustrating an external design of the transformer of fig. 10.

Fig. 12 is a rear view illustrating an external design of the transformer of fig. 10.

Fig. 13 is a plan view illustrating an external design of the transformer of fig. 10.

Fig. 14 is a bottom view illustrating an external design of the transformer of fig. 10.

Fig. 15 is a left side view illustrating an external design of the transformer of fig. 10.

Fig. 16 is a right side view illustrating an external design of the transformer of fig. 10.

In the figure:

10-a transformer; 15-outer core; 151-peripheral wall; 16-inner core; 161 — a first flange portion; 162 — a second flange portion; 163-a core; 17-an electrically conductive wire; 18-the channel.

Detailed Description

Examples of the embodiments will be described below in detail with reference to the accompanying drawings. In the drawings, an arrow F indicates the front of the illustrated configuration. Arrow B indicates the rear of the illustrated construction. Arrow U indicates the top of the illustrated configuration. Arrow D indicates the underside of the illustrated construction. Arrow R indicates the right of the illustrated configuration. Arrow L indicates the left of the illustrated configuration. These expressions of directions are used for convenience of explanation, and do not limit the posture and direction of the structure shown in the drawings in an actual use state.

The term "front-rear direction" used in the present specification means a direction along the above-described front and rear directions. The term "up-down direction" used in the present specification means a direction along the above-described upper and lower directions. The term "left-right direction" used in the present specification means a direction along the above-mentioned left and right directions.

The expression "extend in the front-rear direction" used in the present specification includes an extension inclined with respect to the front-rear direction and an extension closer to the front-rear direction than the up-down direction and the left-right direction.

The expression "extend in the vertical direction" used in the present specification includes extending obliquely to the vertical direction and extending at an inclination closer to the vertical direction than to the front-rear direction and the left-right direction.

The expression "extend in the left-right direction" used in the present specification includes extending obliquely to the left-right direction and extending at an inclination closer to the left-right direction than to the front-back direction and the up-down direction.

Fig. 1 illustrates an appearance of a transformer 10 according to an embodiment viewed from the upper left rear. Fig. 2 illustrates an appearance of the transformer 10 as viewed from the lower left front. The transformer 10 includes an outer shield case 11, a base 12, and a plurality of terminals 13.

The outer shield shell 11 is formed of a material having conductivity. The base 12 is formed of a material having electrical insulation. Each of the plurality of terminals 13 is formed of a material having conductivity.

Fig. 3 illustrates an appearance of the transformer 10 in a state where the outer shield case 11 is removed. The transformer 10 includes an inner shield case 14.

The inner shield case 14 includes a fitting hole 141. The outer shield shell 11 is fixed to the inner shield shell 14 by fitting a fitting hole 141 with a fitting projection, not shown, formed on an inner wall surface of the outer shield shell 11.

As illustrated in fig. 2 and 3, the inner shield case 14 includes a pair of engaging pieces 142. The inner shield case 14 is fixed to the base 12 by the engagement of the pair of engagement pieces 142 with the base 12.

Fig. 4 illustrates an appearance of the transformer 10 in a state where the inner shield case 14 is removed. The transformer 10 includes an outer core 15. The outer core 15 is formed of a material containing a magnetic body.

Fig. 5 illustrates the appearance of the transformer 10 with the outer core 15 removed. The transformer 10 includes an inner core 16. The inner core 16 is formed of a material containing a magnetic body.

The inner core 16 includes a first flange 161, a second flange 162, and a core 163. The core 163 extends in the up-down direction between the first flange 161 and the second flange 162. The inner core 16 is an example of the first core. The up-down direction is an example of the first direction.

The inner core 16 is a one-piece part. The term "one-piece part" as used in this specification refers to a part having a unitary construction. The term "one-piece part" is used in a meaning distinguished from a part integrated by combining a plurality of parts by various methods. Examples of the various methods include adhesion, joining, fusion, welding, engagement, fitting, and screwing.

Fig. 6 illustrates an appearance of the transformer 10 as viewed from above. Fig. 7 illustrates a cross section of the transformer 10 viewed from the arrow direction along the line VII-II in fig. 6. Fig. 8 illustrates a cross section of the transformer 10 viewed from the direction of the arrows along the line VIII-III in fig. 6. Although not shown in fig. 5, the coil is formed by winding the conductive wire 17 around the core 163.

The outer core 15 includes a peripheral wall 151. The peripheral wall 151 surrounds the first flange 161 and the core 163 of the inner core 16 from the front-rear direction and the left-right direction. The outer core 15 is an example of a second core. The front-back direction and the left-right direction are examples of the second direction. The peripheral wall 151 is an example of a wall portion.

The outer core 15 includes a top wall 152. The top wall 152 has a portion vertically opposed to the first flange 161 of the inner core 16. The top wall 152 is connected to the upper end of the peripheral wall 151. Thereby, the outer core 15 closes the upper side of the inner core 16.

As illustrated in fig. 7, the maximum dimension in the left-right direction of the second flange portion 162 is larger than the maximum dimension in the left-right direction of the first flange portion 161. Thus, the second flange 162 has a portion facing the lower end of the peripheral wall 151 of the outer core 15 in the vertical direction.

With this configuration, the peripheral wall of the outer core 15 and the second flange 162 of the inner core 16 can form a structure capable of suppressing leakage of magnetic flux generated from the coil to the outside. By suppressing leakage of magnetic flux to the outside, a decrease in inductance can be suppressed. Since there is no need to take measures to increase the number of turns of the conductive wire 17 in anticipation of the amount of decrease in inductance, it is possible to suppress an increase in size of the transformer 10.

Further, since the structure capable of suppressing leakage of magnetic flux to the outside is realized by the second flange portion 162 which is a part of the inner core 16 as a single component, it is not necessary to prepare another member dedicated to leakage suppression. This can further suppress an increase in size of the transformer 10, reduce the number of components, and reduce the number of manufacturing steps, and can increase the strength of the structure against the influence of vibration applied from the outside.

As a result, the vibration resistance can be improved while suppressing an increase in size of the transformer 10.

As illustrated in fig. 4, a screw groove 153 is formed in the outer surface of the peripheral wall 151 of the outer core 15. In addition, a cross groove 154 is formed in the upper surface of the top wall 152 of the outer core 15.

On the other hand, as illustrated in fig. 8, a screw groove 143 is formed in a part of the inner surface of the inner shield shell 14. The screw groove 143 is screwed with the screw groove 153 of the outer core 15. Thereby, the outer core 15 is supported by the inner shield shell 14 so as to be rotatable about the core portion 163 of the inner core 16.

An opening 144 is formed in an upper portion of the inner shield shell 14. An opening 111 is formed in an upper portion of the outer shield shell 11. Thereby, as illustrated in fig. 1 and 6, the cross groove 154 of the outer core 15 is exposed to the outside through the opening 144 and the opening 111.

The outer core 15 is rotated by engaging a tool such as a phillips screwdriver with the phillips recess 154, and the outer core 15 is displaced in the vertical direction. The value of the inductance can be adjusted by changing the position of the outer core 15 with respect to the inner core 16.

In such a configuration, a situation occurs in which a part of the core 163 of the inner core 16 is not surrounded by the peripheral wall 151 of the outer core 15. In other words, the magnetic flux generated from the coil is likely to leak to the outside. However, as described above, since the second flange portion 162 extends to a position facing the lower end of the peripheral wall 151, leakage of magnetic flux accompanying displacement of the outer core 15 can be minimized.

As illustrated in fig. 8, the maximum dimension in the front-rear direction of the second flange portion 162 is equal to the maximum dimension in the front-rear direction of the first flange portion 161. Thus, in the transformer 10, the passage 18 is formed at a position where the second flange 162 does not face the peripheral wall 151 of the outer core 15.

The plurality of terminals 13 are formed integrally with the base 12. Each of the plurality of terminals 13 includes a mounting terminal 131 and a coil terminal 132.

The mounting terminal 131 is electrically connected to a circuit element formed on a circuit board when the transformer 10 is mounted on the circuit board.

An end 171 of the conductive wire 17 wound around the core 163 of the inner core 16 is drawn out through the passage 18 and electrically connected to the coil terminal 132. That is, a portion of conductive line 17 extends within channel 18.

With such a configuration, it is possible to suppress a reduction in efficiency of the operation of drawing the end portion 171 of the conductive line 17 for electrical connection to an external circuit.

Fig. 9 shows another example of the shape of the inner core 16. In this example, the maximum dimension in the front-rear direction of the second flange portion 162 is also larger than the maximum dimension in the front-rear direction of the first flange portion 161. That is, the second flange 162 also has a portion vertically opposed to the peripheral wall 151 of the outer core 15 in the front-rear direction.

In this case, the passage 18 for leading out the end portion 171 of the conductive line 17 for the purpose of electrical connection with an external circuit is formed as a part of the second flange portion 162. In this example, the channel 18 is formed by grooves formed in the front end portion and the rear end portion of the second flange portion 162, respectively.

The duct 18 may be formed by a through hole formed at a position of the second flange portion 162 not vertically opposed to the peripheral wall 151.

According to the above configuration, it is possible to suppress a decrease in efficiency of the operation of drawing the end portion 171 of the conductive wire 17 for electrical connection to an external circuit, and to increase the size of the second flange portion 162 to the maximum extent, thereby improving the effect of suppressing leakage of magnetic flux generated from the coil to the outside.

The above-described embodiments are merely illustrative for easy understanding of the present invention. The configuration of the above-described embodiment can be modified and improved as appropriate without departing from the gist of the present invention.

In the above embodiment, the outer core 15 is displaceable relative to the inner core 16. However, a structure in which the outer core 15 cannot be displaced with respect to the inner core 16 may be employed.

Fig. 10 to 16 illustrate an external design of a transformer according to an embodiment. Fig. 10 is a perspective view. Fig. 11 is a front view. Fig. 12 is a rear view. Fig. 13 is a plan view. Fig. 14 is a bottom view. Fig. 15 is a left side view. Fig. 16 is a right side view.

Claims (4)

1. A transformer is characterized by comprising:

a first core having a first flange portion, a second flange portion, and a core portion extending in a first direction between the first flange portion and the second flange portion, and formed of a material including a magnetic body;

a conductive wire wound around the core; and

a second core having a wall portion surrounding the first flange portion and at least a part of the core portion from a second direction intersecting the first direction, and formed of a material containing a magnetic body,

the first core is a one-piece part,

the second flange portion has a portion opposed to the wall portion in the first direction.

2. The transformer of claim 1,

the second core is displaceable in the first direction.

3. Transformer according to claim 1 or 2,

the second flange portion defines a passage at a position not opposed to the wall portion in the first direction,

a portion of the conductive line extends within the channel.

4. The transformer of claim 3,

the channel is formed as part of the second flange portion.

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