JPH0520305U - coil - Google Patents

Abstract

(57) [Abstract] [Purpose] Easy to handle large current, no variation in characteristics, simple structure, easy to assemble, less influence of leakage flux on others, and excellent high frequency characteristics. Get the product. [Structure] The pattern 3 of the printed circuit board 26 on a part of the winding
0 is used. Then, the bobbin is unnecessary, and the assembly can be easily performed. Moreover, even if the electric wire 22 used is thick, the electric wire 22 can be in good contact with the pattern 30, so that it is easy to cope with a large current. Further, since the position of the electric wire 22 forming the winding can be determined by the position of the electric wire mounting hole 28 provided on the printed circuit board 26, variations in characteristics are reduced. And the core 24
Use an undivided one. Then, the leakage flux decreases,
There is no adverse effect on others. Further, the position of the electric wire mounting hole 28 is determined so that the electric wires 22 do not contact each other. Then, the stray capacitance between the wires is reduced, and the high frequency characteristics are improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil formed by winding an electric wire around a leg of a core.

[0002]

[Prior Art]

 Conventionally, coil components such as choke coils and line filters have a structure in which windings are assembled to the core. The core is made of E-shaped, I-shaped, U-shaped, etc. spliced cores, and the winding is made by winding the wire around a bobbin with terminal pins a number of times and adhering adjacent wires. Is used.

FIG. 10 is a perspective view showing an example of a line filter. In the figure, 10 is a bobbin with terminal pins 12 (12a, ... 12d), 14 and 16 are first and second windings wound around the bobbin 10, and 18 (18a, 18b) are U-shaped attached to the bobbin 10. Is the core. However, the first and second windings 14 and 16 are arranged on both sides of the partition wall 20 of the bobbin 10, respectively.

[0004]

[Problems to be solved by the device]

 However, when two electric wires are wound around the bobbin 10 at predetermined positions in this manner to form the first and second windings 14 and 16, the ends of the windings are twisted to the corresponding terminal pins 12. Need to be soldered. For this reason, the thicker the wire, the more difficult it is to twist the cable, which easily causes poor contact and makes it difficult to handle large currents.

Further, when two U-shaped cores are joined to form a magnetic path, the magnetic resistance at the joining portions of both cores 18 naturally becomes larger than the others. Therefore, the amount of magnetic flux leaking into the air also increases. Normally, if there is a metal conductor nearby, the leakage flux will cause eddy current loss and raise the temperature, and if there is a coil nearby, the leakage flux will interlink, causing malfunction. It becomes a noise source to the equipment and has other adverse effects.

Moreover, when the electric wires are closely attached to each other and wound around the bobbin 10, the stray capacitance between the electric wires for each winding increases, so that the high frequency characteristics of the windings 14 and 16 deteriorate.

The present invention has been made by paying attention to such conventional problems, and it is easy to cope with a large current, does not have variations in characteristics, has a simple structure, is easy to assemble, and has no leakage. It is an object of the present invention to provide a coil which has little influence on others due to a magnetic flux and has excellent high frequency characteristics.

[0008]

[Means for Solving the Problems]

 To achieve the above object, the coil according to the present invention comprises a winding wire 36 (38) wound around a leg 34 of a core 24, and a pattern 30 of a printed circuit board 26 is used as a part of the winding wire 36. ..

It is preferable that the core 24 is not divided.

Further, the position of the electric wire mounting hole 28 provided in the pattern portion of the printed board 26 may be determined so that the installed electric wires 22 do not contact each other.

[0011]

[Action]

 When the pattern 30 of the printed circuit board 26 is used for a part of the winding wire 36 with the above structure, the wire attachment hole 28 is opened in the pattern portion of the printed circuit board 26, and the end of the wire 22 is placed in the attachment hole 28. Can be inserted and soldered. At that time, even if the electric wire 22 is thick, the contact with the pattern 30 can be favorably performed. Therefore, the plurality of electric wires 22 are wound around the legs 34 of the core 24, the electric wires 22 are connected in series through the pattern 30, and the winding 36 is wound around the legs 34 of the core 24. Then, the core 24 can be pressed and fixed onto the printed circuit board 26 by the plurality of electric wires 22.

When the undivided core 24 is used, since there is no joint, the leakage magnetic flux is reduced.

If the position of the wire mounting hole 28 is determined so that the wires 22 do not contact each other, the stray capacitance between the wires is reduced.

[0014]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a perspective view showing a state of the line filter to which the present invention is applied as seen from the back side, FIG. 2 is a perspective view showing the state of the line filter as seen from the front side, and FIG. 3 is each configuration at the time of assembling the line filter. It is a perspective view which shows the correspondence of arrangement | positioning of components. In the figure, 22 (22a, ... 22d) are U-shaped electric wires, 24 is an undivided J-shaped core, and 26 is a printed circuit board on which the electric wires 22 and the core 24 are installed. If the core is not divided, there is no joint and the leakage flux decreases.

Square holes 28 for attaching the four electric wires 22 are formed in the center of the printed circuit board 26 side by side in a matrix of 2 rows and 4 columns. At that time, the positions of the respective mounting holes 28 are set so as to penetrate through the end portions of the respective patterns 30 (30a, ... 30f) provided on the back surface of the printed circuit board 26 as shown in FIG. Moreover, in order to reduce the floating electrostatic capacity between the electric wires 22, the electric wires 22 to be installed are not brought into contact with each other. 32 (32a, ... 32d) is a terminal provided at one end of each pattern 30a, 30c, 30d, 30f.

At the time of assembly, first, the core 24 is placed on the surface of the printed circuit board 26, and the respective electric wires 22 are arranged and wound at predetermined positions of the central leg 34 of the core 24. It is inserted into each of the mounting holes 28. At that time, the respective electric wires 22, the core 24, and the printed circuit board 26 are arranged after being associated with each other as shown in FIG.

Next, the end portion of each electric wire 22 and the pattern 30 are soldered. At this time, since the electric wire 22 is simply inserted into the mounting hole 28 and soldered, the connection with the pattern 30 can be made well even if the electric wire 22 is thick. Therefore, the electric wires 22a and 22b are connected in series via the pattern 30b, and the electric wires 22c and 22d are connected in series via the pattern 30e. Then, the windings 36 and 38 wound around the central leg 34 of the core 24 are completed, and the line filter 40 as shown in FIGS. At this time, when the central legs 34 are equidistantly spaced and pressed by the four electric wires 22 arranged in a line, the core 24 is satisfactorily fixed on the printed circuit board 26. Note that FIG. 5 is an electric circuit diagram of the line filter 40.

By winding each electric wire 22 around the central leg 34 of the core 24 in this manner, the bobbin that has been used conventionally becomes unnecessary. Moreover, since the core 24 is placed horizontally on the printed circuit board 26, the line filter 40 can be made thin. At the time of use, the windings 36 and 38 are respectively interposed between the commercial power source lines having different polarities, so that the winding 36 is connected using the terminals 32a and 32b, and the winding 38 is connected using the terminals 32c and 32d.

FIG. 6 is a perspective view showing a correspondence relationship of arrangement of each component when assembling another line filter to which the present invention is applied. In the figure, 42 (42a, ... 42f) are U-shaped electric wires, 44 is an undivided square-shaped core, and 46 is a printed circuit board on which the electric wires 42 and the core 44 are installed.

Mounting holes 48 for mounting the six electric wires 42 are formed in a matrix of four rows and three columns over almost the entire area of the printed circuit board 46. At that time, the positions of the respective mounting holes 48 are set so as to penetrate through the end portions of the respective patterns 50 (50a, ... 50h) provided on the back surface of the printed circuit board 46, as shown in FIG. Moreover, the electric wires 42 to be installed are prevented from coming into contact with each other. 52 (52a, ... 52d) is a terminal provided at one end of each pattern 50a, 50d, 50e, 50h.

At the time of assembly, first, the core 44 is placed on the surface of the printed circuit board 46, the electric wires 42 are respectively placed and wound at predetermined positions of both legs 54 (54a, 54b) of the printed circuit board 46, and then the respective ends thereof are wound. It inserts in the inside of each corresponding mounting hole 48, respectively. Further, the ends of each wire 42 and the pattern 50 are respectively soldered, the wires 42a, 42b and 42c are connected in series through the patterns 50b and 50c, and the wires 42d, 42e and 42f are connected through the patterns 50f and 50g. Connect in series. Then, a line filter having windings wound around both legs 54 of the core 44 is obtained.

FIG. 8 is a perspective view showing the correspondence relationship of the arrangement of each component when assembling another line filter to which the present invention is applied. In the figure, 54 is a U-shaped electric wire, 56 is an undivided toroidal core, and 58 is a printed circuit board on which the electric wires 54 and the core 56 are installed. Also in this case, the electric wires 54 are divided into two groups of five wires, and the electric wires 54 of each group are connected in series with a pattern interposed. Then, a line filter in which two windings are wound around the toroidal core 56 is obtained.

Although various line filters have been described in the above embodiments, a choke coil can be similarly manufactured. However, in the case of the choke coil 60, the number of windings 64 wound around the core 62 is one, as shown in FIG.

[0024]

[Effect of the device]

 According to the present invention described above, since the pattern of the printed circuit board is used for a part of the winding wire, the core is placed on the printed circuit board, a plurality of electric wires are respectively wound around the cores and attached to the printed circuit board. The winding can be formed by interposing. Therefore, the bobbin is not necessary and the assembling becomes easy. Moreover, even if the electric wire to be used is thick, it can be connected well to the pattern, so that it becomes easy to cope with a large current. Further, since the position of the electric wire forming the winding can be determined by the position of the electric wire mounting hole provided on the printed circuit board, variations in characteristics are reduced.

When an undivided core is used, the leakage magnetic flux is reduced, so that it is possible to prevent other adverse effects.

If the positions of the wire mounting holes are determined so that the wires do not come into contact with each other, the stray capacitance between the wires is reduced, so that high frequency characteristics can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a state of a line filter to which the present invention is applied, viewed from the back side.

FIG. 2 is a perspective view showing a state of the line filter viewed from the front side.

FIG. 3 is a perspective view showing a correspondence relationship of arrangement of each component at the time of assembling the line filter.

FIG. 4 is a bottom view of a printed circuit board forming the line filter.

FIG. 5 is an electric circuit diagram of the line filter.

FIG. 6 is a perspective view showing a correspondence relationship of arrangement of each component when assembling another line filter to which the present invention is applied.

FIG. 7 is a bottom view of a printed circuit board forming the line filter.

FIG. 8 is a perspective view showing a correspondence relationship of arrangement of each component when assembling another line filter to which the present invention is applied.

FIG. 9 is an electric circuit diagram of a choke coil to which the present invention is applied.

FIG. 10 is a perspective view showing a conventional line filter.

[Explanation of symbols]

22, 42, 54 ... Electric wires 24, 44, 56, 62 ... Cores 26, 46, 58 ... Printed circuit boards 28, 48 ... Electric wire mounting holes 30, 50 ... Patterns 32, 52 ... Terminals
34, 54 ... Legs 36, 38, 64 ... Winding 40 ... Line filter 60 ... Choke coil

Claims (3)

[Scope of utility model registration request] 1. A coil comprising a winding wound around a leg of a core, wherein a pattern of a printed circuit board is used for a part of the winding. 2. The coil according to claim 1, wherein an undivided core is used. 3. The coil according to claim 1, wherein the position of the wire mounting hole formed in the pattern portion of the printed circuit board is determined so that the installed wires do not contact each other.