JPH0754979Y2 - Bobbin for insulated transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bobbin for an insulation type transformer used in, for example, a high frequency switching power supply of an electronic device such as a television receiver.

[Conventional technology]

The IEC standard is one of the safety standards for electronic devices such as television receivers.In this standard, the creepage space distance for ensuring insulation between the primary side and the secondary side of an insulated high-frequency switching transformer is set to 6 mm or more. In some cases, it is necessary to clear this strict IEC standard in international competition in the electronic equipment industry.

FIG. 6 shows a symmetrical structure of a general bobbin of an insulation type high frequency switching transformer used for a switching power supply of a television receiver in a form of an upper half. In this type of bobbin, a cylindrical coil winding body 2 is erected from the center of the upper surface side of the terminal pedestal 1, and a rising end of the coil winding body 2 is provided with a collar (not shown). A plurality of terminal pins (6 pins on one side, 12 pins in total on both sides in FIG. 6) 3 are provided at both end edges on the bottom side of the pair of opposite sides of the terminal pedestal 1 at regular intervals. It is projected right below. A plurality of lead wire accommodating grooves 4 are formed on both side end surfaces of the terminal pedestal 1 at the same pitch intervals as the arrangement pitch of the terminal pins 3.

Further, a notch groove 5 is formed on the other pair of opposed end faces in the direction perpendicular to the side end face on the side where the lead wire accommodating groove 4 is formed. The bottom surface 6 of the notch groove 5 is formed in an arc surface corresponding to the outer peripheral surface of the winding wound around the coil winding body 2.

This bobbin is fitted and mounted on the E-shaped core 7. At the time of this fitting and mounting, the center leg 7a of the E-shaped core 7 is fitted into the cylindrical hole of the coil winding body portion 2 and the cutout groove 5 is fitted. The outer legs 7b, 7c of the E-shaped core 7 are fitted in. The inner surfaces of the outer legs 7b, 7c (the surfaces facing the arcuate surface of the bottom surface 6 of the cutout groove 5) are arcuate surfaces that become thinner toward the center so as to match the arcuate surface of the bottom surface 6.

When the assembly of this type of bobbin and the E-shaped core 7 is used as an insulation type switching transformer, the lead wire of the plurality of layers of the primary coil wound around the coil winding body portion 2 corresponds to the lead wire accommodation groove 4. The lead-out end portion is connected to the corresponding terminal pin 3 by being entangled.

[Problems to be solved by the device]

However, this type of general insulation type high frequency switching transformer bobbin has a plurality of lead wire accommodating grooves 4.
Are arranged at a wide pitch equal to the pitch of the terminal pins 3, the outermost groove 4 of the lead wire accommodating groove 4 and the groove E
When the protruding tips A of the outer legs 7b and 7c of the mold core 7 are close to each other and the E-core 7 is connected to the secondary side ground of the circuit, the creepage clearance defined by the IEC standard, that is, the outermost position It becomes difficult to secure a creeping space distance of 6 mm or more between the lead wire 10 on the primary side of the coil winding housed in the lead wire housing concave groove 4 and the projecting tip end portion A of the outer legs 7b and 7c of the E-shaped core 7. , IEC
There is a problem that the standard cannot be cleared. To clear this IEC standard, as shown in Fig. 7,
An arc R with a radius of 6 mm centered on the protruding tip A of the outer legs 7b, 7c
It is necessary to provide a guide wall 8 having a guide wall, and to draw out the lead wire 10 along the guide wall 8, but the trouble of having to pull out the lead wire 10 carefully so that it does not come off the guide wall 8 is there.

Further, as shown in FIG. 8, in a multi-output type bobbin provided with more multi-output terminal pins 3 (FIG. 8 is a 16-pin bobbin), the lead wire receiving recessed groove 4 at the end and the end The second lead wire receiving recessed groove 4 together is included in the region of a radius 6 mm from the protruding tip A of the outer leg 7b, 7c, and as shown in FIG. 9, the outer leg 7b, 7c is protruded. Even if a guide wall 8 having a radius of 6 mm is provided from the tip portion A to secure a creeping space distance, the lead wire is guided along the guide wall 8 and is led out to the endmost lead wire receiving concave groove 4. The lead wire led out to the second lead wire accommodation groove 4 from the end comes into contact with or is very close to each other, and each lead wire 10
A new problem arises in that insulation between them cannot be achieved.

The present invention has been made in order to solve the above-mentioned conventional problems, and its purpose is to be able to secure a sufficient creepage space distance of the IEC standard, and moreover, the number of terminal pins and the number of lead wire accommodating concave grooves are the same. Therefore, it is easy to draw out the coil winding wire that is drawn into each of the lead wire accommodation recessed grooves.
Another object of the present invention is to provide an insulation type transformer bobbin that can reliably insulate each lead wire.

[Means for Solving the Problems]

The present invention is configured as follows to achieve the above object. That is, according to the present invention, a coil winding body portion having a center hole is erected on the upper surface side of a terminal pedestal, and a plurality of terminal pins are formed at predetermined intervals on the bottom surface side insulating portions of a pair of opposite sides of the terminal pedestal. In the insulating transformer bobbin in which the other pair of opposite sides of the terminal pedestal are fitted and mounted between the outer legs of the E-shaped core, the side end surface of the terminal pedestal on the side on which the terminal pin is provided. In the central portion, a plurality of lead wire accommodating concave grooves as many as the number of the terminal pins are formed such that the groove pitch on the bottom surface side is larger than the upper surface side of the terminal pedestal, and the groove pitch on the bottom surface side of the terminal pin is The lead wires are arranged in a concentrated manner with a pitch smaller than the arrangement pitch, and the lead wires are provided between the lead wires of the coil lead wires on the bottom surface of the pedestal from the outlet of the lead wire receiving concave groove on the bottom surface side of the terminal pedestal to the root of the terminal pin. Line accommodation recess Slope or a step is configured as being provided to ensure the outlet and the insulating distance of the base in the thickness direction between the bottom surface of the root portion of the terminal pin.

[Action]

When the bobbin of the present invention is used, for example, for an insulation type high frequency switching transformer, the lead wires of the plurality of primary coils wound around the winding drum are formed one by one in the central portion of the side end surface of the terminal pedestal. Through the individual lead wire accommodating concave grooves that are present, it is entangled with the root of the corresponding terminal pin. In the present invention, the plurality of lead wire accommodating concave grooves are centrally provided in the central portion of the side end surface of the pedestal, and the groove pitch on the bottom surface side (groove outlet side) is formed smaller than the arrangement pitch of the terminal pins. The distance between the lead wire housed in the lead wire housing groove at the end and the outer leg of the E-shaped core increases,
This distance sufficiently clears the creepage space distance of 6 mm or more specified by the IEC standard. In addition, since an inclination or a step is provided in the lead-out path of the lead-out wire from the outlet of the lead-out wire accommodating groove to the root of the terminal pin, the tangled portion of the lead-out wire entangled at the base of the terminal pin and its adjacent side Insulation distances in the horizontal direction and the height direction are ensured between the lead lines drawn to the terminal pins, and sufficient insulation between the lead lines drawn to the terminal pins is ensured.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In the description of the present embodiment, the same parts as those in the conventional example are designated by the same reference numerals, and the duplicate description thereof will be omitted.

1 to 4 show the construction of an embodiment of an insulating type transformer bobbin according to the present invention. In the bobbin of the present embodiment, as in the conventional bobbin, a plurality of terminal pins 3 are provided directly below both end edges on the bottom surface side of a pair of opposite sides of the terminal pedestal 1 with a pitch interval required by the insulation standard. A plurality of lead wire accommodating concave grooves 4 of the same number as the terminal pins 3 are concentrated in the central portion of the side end surface of the terminal pedestal 1 on the side where the terminal pins 3 are provided. Has been formed. That is, these lead wire accommodation recessed grooves 4
Are intensively arranged with a pitch smaller than the pitch of the terminal pins 3. As shown in FIG. 2, the lead wire accommodating concave groove 4 has a wider pitch interval on the bottom surface side than on the upper surface side of the terminal pedestal 1, and accordingly, the lead wire accommodating recesses 4 are separated from the center position on both sides. The concave groove 4 is an oblique groove in which the bottom surface side of the terminal pedestal 1 spreads outward, and it is easy to draw out the lead wire 10 drawn out through the lead wire accommodation groove 4 toward the corresponding terminal pin 3, and It is easy to get entangled in the pin 3.

In this embodiment, as shown in FIGS. 3 and 4, the lead-in wire 10 extends from the outlet side of the lead-out wire recessed groove 4 to the bottom surface 9 of the root of the terminal pin 3 in the lead-out path. There is an inclination 11 that gradually increases in height from the outlet of 4 toward the bottom surface 9 of the root of the terminal pin 3. Therefore, the corresponding terminal pin 3 is passed through the lead wire accommodating groove 4.
The part 12a of the leader line 10 that is entangled in the wire and the part of the leader line 10 on the slope 11 surface of the leader line 10 next to it
Not only the distance on the horizontal plane (insulation distance) but also the distance in the height direction (thickness direction of the terminal pedestal 1) (insulation distance) is ensured between the wire 12b and 12b.

Note that, as shown in FIG. 5, the distance in the height direction between the adjacent barbed portion 12a and the lead wire portion 12b on the inclined surface is as shown in FIG. It can be ensured also by providing a step h between the bottom portion 9 of the knotted portion.

In the present embodiment configured as described above, the lead wire accommodating recessed grooves 4 are centrally provided in the central portion of both end portions of the terminal pedestal 1 with a pitch interval narrower (smaller) than the pitch interval of the terminal pins. Therefore, when the bobbin of this embodiment is mounted on the E-shaped core 7, the distance between the outer legs 7b and 7c of the E-shaped core 7 and the lead wire 10 accommodated in the groove 4 at the end is It becomes larger, and it becomes possible to secure a sufficient creepage clearance defined by the IEC standard. Further, since the lead wire accommodating concave groove 4 is an oblique groove that opens outward toward the bottom surface side of the terminal pedestal 1, the lead wire 10 is drawn toward the corresponding terminal pin 3 on the outlet side of the groove 4. As a result, the work of pulling out to the terminal pin 3 can be performed smoothly. In addition, since the creepage space distance is sufficiently secured, it is possible to linearly draw each lead wire 10 from each individual lead wire accommodation groove 4 and twist the lead wire 10 to the corresponding terminal pin 3. Connection work of the lead wire 10 to the terminal pin 3 is also facilitated. Furthermore, since the lead wire accommodating recessed grooves 4 are intensively formed in the central portion of the end portion of the terminal pedestal 1, the corresponding lead pin accommodating groove 4 has a corresponding terminal pin 3.
Although the distance on the plane of each lead wire 10 that is drawn out to the terminal becomes small, in the present embodiment, as described above, the slope 11 or the step is formed in the path from the outlet of the accommodation groove 4 to the root bottom surface 9 of the terminal pin 3. Is provided, it is possible to secure a distance in the height direction between the barbed portion 12a of the lead wire 10 and the lead wire portion 12b on the inclined or stepped surface. It is possible to ensure the insulation of the.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and various modes of implementation can be adopted. For example, in the above-described embodiment, it is possible to provide a guide wall in the lead-out path of the lead-out wire 10 from the outlet side of the lead-out wire accommodation groove 4 to the root bottom surface 9 of the terminal pin 3. If the guide wall is provided in this manner, the work of pulling out the lead wire 10 can be performed more easily.

In the above embodiment, the bobbin of the insulation type high frequency switching transformer used for the switching power supply of the television receiver is described as an example.
For example, the bobbin of a flyback transformer can be used as a bobbin for a transformer other than a high frequency.

[Effect of device]

In the present invention, the lead wire accommodating concave grooves are centrally provided in the central portion of the end portion of the terminal pedestal with a groove pitch interval which is smaller on both the inlet side and the outlet side (bottom surface side) than the arrangement pitch interval of the terminal pins. , It is possible to increase the distance between the outer leg of the E-shaped core fitted and mounted on the terminal pedestal and the coil lead wire housed in the lead wire housing recess groove at the outermost end, and clear the creeping clearance according to the IEC standard sufficiently. It becomes possible. Further, since there is an inclination or a step between the lead-out paths of the lead wires from the outlet of the lead-out wire accommodation groove on the bottom surface side of the terminal pedestal to the root bottom surface of the terminal pin, the pitch spacing of the lead wire accommodation groove Despite making the lead wire accommodating concave groove concentrated, the distance in the height direction as well as the distance on the horizontal plane can be secured between the lead wires, which ensures the insulation between the lead wires. As a result, even for a multi-output type bobbin, the creepage space distance and insulation between each lead wire can be sufficiently secured.

In addition, the lead wire accommodating concave groove has a groove pitch larger on the bottom surface side than on the upper surface side of the terminal pedestal, and because the number of terminal pins and the number of the lead wire accommodating concave grooves are the same, when drawing out the lead wire of the coil. In addition, even if the number of cores of the coil lead wire is the same as the number of terminal pins, one lead wire can be accommodated in one lead wire accommodation groove and smoothly pulled out to the corresponding terminal pin. As a result, it is possible to improve the efficiency of the work of connecting the lead wire to the terminal pin, and since a plurality of coil lead wires are not housed in one coil lead wire housing groove. Also, there is no need to worry that a plurality of coil lead wires come into contact with each other in the coil lead wire accommodating concave groove and cause an insulation problem.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of one embodiment of an insulation type bobbin according to the present invention on one side of a symmetrical portion, FIG. 2 is a front view of the bobbin of the same embodiment, and FIG. 3 is a view of the same embodiment. FIG. 4 is a bottom view showing the bobbin on one side of the symmetrical portion, FIG. 4 is a perspective view showing a slanted portion provided in the lead-out path of the lead line of the embodiment, and FIG. 5 is formed in the lead-out path of the lead line of the embodiment. 6 is a plan view showing a structure of a conventional bobbin for a general insulation type high frequency switching transformer on one side of a symmetrical type, and FIG. 7 is a creeping space distance in the bobbin of the conventional example. Explanatory drawing showing the securing means of No. 8
FIG. 9 is a plan view showing a conventional multi-output type bobbin on one side of a symmetric type, and FIG. 9 is an explanatory view showing a difficult state of securing a creeping space distance occurring in the multi-output type bobbin. 1 ... Terminal pedestal, 2 ... Coil winding body part, 3 ... Terminal pin, 4 ... Drawer wire receiving groove, 5 ... Notched groove, 6
…… Bottom, 7 …… E-shaped core, 7a …… Center leg, 7b, 7c ……
Outer legs, 8 ... Guide wall, 9 ... Bottom of barbed, 10 ...
… Leader line, 11 …… Inclination, 12a …… Bald part, 12b…
… The part of the leader line on the inclined surface.

Claims (1)

[Scope of utility model registration request] 1. A coil winding body portion having a center hole is erected on the upper surface side of a terminal pedestal, and a plurality of terminal pins are formed at predetermined intervals at the bottom side edges of a pair of opposite sides of the terminal pedestal. In the insulating transformer bobbin in which the other pair of opposite sides of the terminal pedestal are fitted and mounted between the outer legs of the E-shaped core, the side end surface of the terminal pedestal on the side on which the terminal pin is provided. In the central portion, a plurality of lead wire accommodating concave grooves as many as the number of the terminal pins are formed such that the groove pitch on the bottom surface side is larger than the upper surface side of the terminal pedestal, and the groove pitch on the bottom surface side of the terminal pin is The lead wires are arranged in a concentrated manner with a pitch smaller than the arrangement pitch, and the lead wires are provided between the lead wires of the coil lead wires on the bottom surface of the pedestal from the outlet of the lead wire receiving concave groove on the bottom surface side of the terminal pedestal to the root of the terminal pin. Exit of wire receiving groove Isolated transformer bobbin, characterized in that the inclined or stepped to ensure the thickness direction of the insulating distance of the base between the bottom surface of the root portion of the terminal pins are provided.