JP2000114067A - Inductance element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate application to various voltages, and to make it unnecessary to operate the terminal processing of a coil part by simplifying the structure. SOLUTION: When input and output voltages are changed, one or more pertinent plate-shaped coils 21 among the plural kinds of plate-shaped coils 21 are selected. Those plate-shaped coils are inserted into the proper part of a slot so that application to various voltages is facilitated. Also, coils 23 and leads 27 are integrally formed in each plate-shaped coil 21. Therefore, the leads 27 are soldered with the prescribed position of a main substrate 41 so that the electric connection of the main substrate 41 with the coils 23 can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an inductance element having a winding such as a transformer or a choke coil.

[0002]

Generally, as an inductance element used in this type of switching regulator or DC-DC converter, for example, Japanese Patent Application Laid-Open No.
According to JP-A-92663, a winding serving as a conductive winding is wound around a body of a core bobbin, and both ends of the winding are connected to pins projecting below a base of the core bobbin. Later, there is disclosed a transformer in which a core having an arbitrary structure such as an EE type or an EI type is mounted on the integrated coil portion.

Meanwhile, there are various types of main substrates such as switching regulators and DC-DC converters on which such inductance elements are mounted, and various types of input substrates that handle inductance elements accordingly. The output voltage differs for each main board. However, in the above-mentioned conventional inductance element,
If you do not consider the number of turns and thickness of the winding each time,
There was a problem that it was not possible to manufacture products corresponding to various voltages, and it was extremely poor in versatility. Moreover, in order to electrically connect the winding and the main board, first, when manufacturing the inductance element, each end of the winding is connected to a pin at a predetermined position, and then the completed inductance element is connected. Each pin had to be inserted into the land of the main board and connected by soldering, and in a series of operations, terminal treatment for connecting the ends of the windings to the pins was forced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to easily cope with various voltages and to simplify the structure, thereby eliminating the need for terminal treatment of a winding part. An object of the present invention is to provide an inductance element.

[0005]

In order to achieve the above object, an inductance element according to the present invention has a conductive pattern formed on a thin substrate as a winding portion, and an end of the winding portion is connected to a main substrate. It is composed of a plurality of types of plate-like coils integrally formed with a lead-out portion enabling soldering connection, and a bobbin provided with a slot portion capable of stacking the plate-like coils in a plurality of stages.

According to the above configuration, when, for example, the input / output voltage changes according to the type of the main board, one or a plurality of corresponding plate coils are selected from a plurality of types of plate coils and the slot is selected. It only has to be inserted in the right place in the part. In addition, since each of the plate-shaped coils stacked in one or more stages by the slot portion is integrally formed with the drawer portion together with the winding portion, it is only necessary to solder this drawer portion to a predetermined position on the main board and to connect it. The electrical connection between the main substrate and the winding part can be achieved without performing the terminal treatment of the winding part.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the inductance element according to the present invention will be described below with reference to FIGS. The inductance element in the embodiment is a main transformer of a switching regulator. 1 and 2, reference numeral 1 denotes a bobbin formed of a member having an insulating property. The bobbin 1 includes a cylindrical portion 2 in which disk-shaped members are vertically arranged at intervals, and a bobbin 1. A coil insertion portion 3 formed on one side of the portion 2, a mounting portion 4 formed on the opposite side of the coil insertion portion 3, that is, on the other side of the cylindrical portion 2, and a frame provided in a vertical direction of the cylindrical portion 2. And the core mounting portion 5 of the above.

In each of the above-described configurations, the outer shape of the coil insertion portion 3 has a rectangular frame shape, and an opening is formed in a shape into which a plate-shaped coil 21 described later can be inserted.
On the inner surface of the cylindrical portion 2, a plurality of groove-shaped slot portions 6 are formed in multiple stages along the insertion direction of the plate coil 21.
The width of each slot 6 is slightly larger than the thickness of the plate coil 21, and is formed in a shape that allows the plate coil 21 to slide along the slot 6. When the plate thicknesses of the plural types of plate coils 21 are all the same, each slot portion 6
However, when the plate-shaped coils 21 having different thicknesses are present, the widths of the respective slot portions 6 are formed so as to be correspondingly different. This makes it possible to stack the plate-shaped coils 21 in the bobbin 1 in a plurality of stages by the slot portions 6 even when there are plate-shaped coils 21 having various thicknesses.

[0009] A plate-shaped coil serving as a winding substrate processed into a plate shape
Reference numeral 21 denotes a thin-layer substrate 22 having an insulating property, in which a conductive pattern is formed as a winding portion 23 on the front and back surfaces, and specifically, a disc-shaped portion 25 having a substantially circular hole 24 formed in the center. When,
A finger hook 26 protruding in the left-right direction from one side of the disk 25
And a pair of lead-out portions 27 protruding outward from the disc-shaped portion 25 on the opposite side of the finger hook portion 26 and formed at both ends of the winding portion 23. And the winding part 23,
A spiral, that is, a spiral shape is provided around a hole 24 into which a main leg 52 of a core 51 described later can be inserted. Here, the outer shape including the plate thickness of the plate-shaped coil 21 is all the same here. Thereby, all the plate-shaped coils 21 can be inserted into an arbitrary slot portion 6.

As shown in FIG. 3, the plate coil 21 has a winding portion.
A plurality of 23 types having different shapes are prepared in advance. In FIG. 3, for convenience, the plate coil 21 used as the primary winding of the transformer is referred to as a primary winding coil 31, and the plate coil 21 used as the secondary winding of the transformer is referred to as a secondary winding. Description will be given as the coil 32. On the input side, the primary winding coil 31 has a high voltage but a small current, so that the width of the winding portion 23 is smaller than the secondary winding coil 32,
There are many turns. In FIG. 3, a winding portion 23 having a total of six turns is formed on both surfaces of a thin substrate 22. vice versa,
The secondary winding coil 32 on the output side has a low voltage but a large current, so that the winding portion 23 is smaller than the primary winding coil 31.
Is large and the number of turns is small. In FIG. 3, a winding portion 23 having a total of two turns is formed on both surfaces of a thin substrate 22. Here, two types of plate coils 21 are shown, but by changing the shape and the number of turns of the winding portion 23,
An arbitrary plate coil 21 corresponding to the input / output voltage can be obtained. Also, even if the winding portion 23 is formed as wide as possible, if a single plate-shaped coil 21 does not allow current to flow any more, each lead portion 27 of the plurality of plate-shaped coils 21 is If a connection is made with a main board 41 to be described later on which an inductance element is attached, it is possible to cope with a large current.

When the plate-shaped coil 21 is mounted on an arbitrary slot portion 6, the lead-out portion 27 of the plate-shaped coil 21 is inserted into the square hole 8 formed in the mounting portion 4, and the opposite side of the finger hook portion 26. Is arranged so that the distal end surface of the disk-shaped portion 25 abuts on the inner bottom surface of the mounting portion 4. At this time, the plate coil 21
The disk-shaped portion 25 is disposed substantially coaxially with the cylindrical portion 2, and a drawer portion 27 is disposed so as to protrude outward from the bottom surface of the mounting portion 4. An elastic engaging portion 28 is provided on the mounting portion 4 so as to protrude outward in the same direction as the drawer portion 27. On the other hand, a main board 41 on which main components of various power supply devices such as a switching regulator are mounted is a plate-shaped insulating member.
A conductive pattern 43 is formed on one surface or both surfaces of the conductive pattern 43, and a conductive plating through hole 44 corresponding to the lead portion 27 is formed at an appropriate position of the conductive pattern 43, and a portion where the conductive pattern 43 is not formed. Further, a hole 45 for engaging with the engaging portion 28 is formed. The shape and number of the engaging portions 28 are not particularly limited, and a positioning pin or the like may be provided instead of the engaging portions 28.

An EE 51 forms a magnetic circuit of a transformer.
The core of the mold. The core 51 is mounted on the core mounting portion 5 of the bobbin 1, and has a main leg 52 provided at the center.
And side legs 53 provided on both sides of the main leg 52. The main leg 52 is formed in a shape that allows the cylindrical portion 2 and the hole 24 of the plate-shaped coil 21 to be inserted. Although only one core 51 is shown in FIG. 1, there is actually another core 51 having the same shape.
A predetermined closed magnetic circuit is formed by matching 51 with each other.

In order to manufacture the transformer having the above structure, one or more plate coils 21 corresponding to the specification of the main board 41 are first selected from a plurality of types of plate coils 21, and both sides of the finger hook portion 26 are selected. Each of the plate-shaped coils 21 is inserted one by one from the coil insertion portion 3 into the determined position of the slot portion 6 while being sandwiched by fingers. The plate-shaped coil 21 can be inserted into the inside of the bobbin 1 along the slot 6,
When the distal end surface of the disk-shaped portion 25 comes into contact with the inner bottom surface of the mounting portion 4 after 27 is inserted into the square hole 8 formed in the mounting portion 4, the plate-shaped coil 21 can be further inserted. become unable. In this state, the lead-out portion 27 of the plate-shaped coil 21 is connected to the mounting portion 4 so that the plate-shaped coil 21 can be connected to the main substrate 41 to be described later by soldering.
Protruding outward from the bottom surface.

After inserting the respective plate-shaped coils 21 at predetermined positions of the slot portion 6 until the base end of the finger hook portion 26 abuts against the coil insertion portion 3, a pair of the coiled portions 21 is attached to the core mounting portion 5 of the bobbin 1. The core 51 is mounted so that the cores 51 face each other.
When the core 51 is mounted, the main leg 52 of the core 51 is inserted into the hole 24 of each plate coil 21. Therefore, the movement of the plate coil 21 is particularly restricted in the horizontal direction, and the plate coil 21 is mounted in a stable state inside the bobbin 1. Can be In the process of manufacturing the transformer alone so far, since the winding part 23 and the lead part 27 are formed integrally with the plate-shaped coil 21, both ends of the winding part 23 are connected to the lead part 27 as in the conventional case. Work is not required.

Next, the completed transformer is mounted on the main board 41. Specifically, the pull-out portions 27 of the plate-shaped coils 21 are inserted into the plated through holes 44 while the engaging portions 28 of the bobbin 1 are pushed into the holes 45 of the main board 41 against its own elasticity. When the head of the engaging portion 28 comes out of the hole 45 of the main board 41, the force applied to the engaging portion 28 is released, the engaging portion 28 spreads outward, and the bobbin 1 is easily removed from the main board 41. You will not be able to leave. At the same time, the mounting portion 5 of the bobbin 1 is abutted on the mounting surface of the main board 41. In this state, each plate coil 21
By electrically connecting the lead portion 27 to the plated through hole 44 by soldering, electrical connection between the winding portion 23 and the main board 41 is achieved.

As described above, according to the above embodiment, the conductive pattern is formed on the thin layer substrate 22 as the winding portion 23, and the end of the winding portion 23 can be connected to the main substrate 41 by soldering. A plurality of types of plate-shaped coils 21 integrally formed with a drawer portion 27 to be
The bobbin 1 having the slot portion 6 in which the plate coils 21 can be stacked in a plurality of stages constitutes a transformer as an inductance element.

In this case, if, for example, the input / output voltage changes according to the type of the main substrate 41, a plurality of types of plate-shaped coils
It is only necessary to select one or a plurality of the corresponding plate-like coils 21 from among the 21 and insert them into appropriate positions of the slot portion 6. Also,
In each of the plate-shaped coils 21 stacked in one or more stages by the slot portion 6, the lead portion 27 is formed integrally with the winding portion 23. Therefore, the lead portion 27 is connected to a predetermined position of the main substrate 41 by soldering. By simply doing so, the electrical connection between the main board 41 and the winding part 23 can be achieved without performing the terminal treatment of the winding part 23. Therefore, it is possible to easily cope with various voltages, and furthermore, by simplifying the structure in which the winding part 23 and the lead-out part 27 are integrated, the terminal treatment of the winding part 23 becomes unnecessary.

Further, as an effect of the embodiment, in the present embodiment, a hole 24 is formed in the plate coil 21 and the main leg 52 of the core 51 forming a magnetic circuit is inserted into the hole 24. .
Therefore, if the main leg 52 of the core 51 is inserted into the hole 24 after the plate coil 21 is inserted into the slot portion 6, the main leg 52 of the core 51 originally prevents a part of the magnetic circuit from coming off of the plate coil 21. And the plate coil 21 can be stably mounted on the bobbin 1 with a reasonable configuration. Further, a finger hook 26 is formed on the plate-shaped coil 21 at a position different from the winding portion 23 so that the finger-shaped coil 21 can be held by a finger. Accordingly, the plate coil 21 can be easily inserted into a predetermined portion of the slot 6 by using the finger hook 26 without directly touching the winding 23. The finger hook 26 is formed so as to come into contact with the coil insertion portion 3 which is the insertion portion of the plate coil 21 formed on the bobbin 1 when the plate coil 21 is mounted. leg
Together with 52, the mounting position of the plate coil 21 can be defined in a stable state.

The plate-shaped coil 21 is not limited to one having a conductive pattern formed on a thin-layer substrate 22 as shown in FIGS. 1 and 3, but may have a structure as shown in FIG. A device using a flexible substrate may be used. A plate-shaped coil 60 shown in FIG. 4 is a disc-shaped bobbin 61 made of synthetic resin.
And a wire rod 63 wound around the central cylindrical portion 62 of the bobbin 61. The wire 63 in which the copper wire is covered with the insulator is radially spread and spirally arranged between a pair of upper and lower flanges 64 formed on the bobbin 61. A fan-shaped notch 65 is formed in the upper flange 64, and a pair of locking pieces 66 for holding the winding start and end ends of the wire 63 radially from the base end of the notch 65 are provided. It is formed. Locking piece 66
A notch 67 is formed as a guide for guiding the winding start end of the wire 63 to the vicinity of the central cylindrical portion 62 and guiding the winding end of the wire 63 to the locking piece 66 side. 67 allows the wire 63 to be easily wound around the bobbin 61. The plate-shaped coil 60 also has the finger hook 26 formed thereon.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the present invention is applicable to, for example, a choke coil and the like in addition to the transformer in the embodiment.

[0021]

According to the inductance element of the present invention, a conductive pattern is formed on a thin substrate as a winding portion, and a lead portion for enabling soldering connection with the main substrate is integrally formed at an end of the winding portion. It is composed of a plurality of types of formed plate coils and a bobbin having a slot portion capable of stacking the plate coils in a plurality of stages, and can easily cope with various voltages, and has a structure. Can eliminate the need for terminal treatment of the winding part.

[Brief description of the drawings]

FIG. 1 is a plan view of an exploded state of each part according to an embodiment of the present invention.

FIG. 2 is a front view showing the bobbin and the core.

FIG. 3 is a plan view showing a plurality of types of plate coils alone.

FIG. 4 is a perspective view of a plate coil showing another modified example of the embodiment.

[Explanation of symbols]

 1 bobbin 6 slot 21 plate coil 22 thin board 23 winding 27 drawer 41 main board

Claims (1)

[Claims] 1. A plurality of types of plate-like members in which a conductive pattern is formed as a winding portion on a thin-layer substrate, and a drawing portion for enabling soldering connection with a main substrate is integrally formed at an end of the winding portion. An inductance element, comprising: a coil; and a bobbin having a slot portion capable of stacking the plate-shaped coils in a plurality of stages.