JPH0310650Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention relates to a transformer for a switching regulator, and in particular facilitates the work of fixing lead wires at the start and end ends of a section-wound transformer winding. This article relates to a transformer for a section-wound switching regulator.

[Conventional technology]

Conventionally, in transformers for switching regulators, transformer winding is usually carried out to fill the entire winding space of the bobbin, and in order to downsize the transformer itself, the flanges at both ends of the winding space of the bobbin are lowered. , the winding was done to almost the same height as the height of the brim.

[Problem that the invention attempts to solve]

However, in the above configuration, the lead wire at the end of the winding cannot be fixed by hooking it on the collar, and the lead wire is fixed using an adhesive tape. On the other hand, when the transformer winding is section-wound, it is necessary to fix the lead wires at the beginning and end of each section's winding, and as mentioned above, the wires must be fixed to the same height as the collar height. When winding, it becomes difficult to lock and fix not only the lead wire at the end of the winding, but also the lead wire at the start end of the winding to the collar. Therefore, the lead wire at the end of each winding and, in some cases, the lead wire at the start end of each winding must also be fixed with adhesive tape, which has the drawback of very poor workability. Furthermore, if the brim is made higher, it becomes possible to engage and fix the lead wires at the winding start end and the winding end end to the brim, but this has the disadvantage of increasing the size of the transformer.

[Means for solving problems]

The present invention was made to solve the above problems, and the section winding bobbin is provided with a non-winding groove and a collar for processing the lead wire, so that the lead wire of each winding can be locked and fixed to the collar. To provide a transformer for a section-wound switching regulator with improved workability.

〔Example〕

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, one embodiment of a transformer for a section-wound switching regulator of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a plan view showing an example of a section winding bobbin used in an embodiment of a transformer for a switching regulator according to the present invention. The bobbin is shown when winding is divided into A, B, C, and D. This bobbin 10 includes a terminal drawer side rib 11, a top rib 12, a first, a second, and a third rib.
three intermediate collars 13, 14 and 15. Reference numeral 16 indicates a terminal pin attached to the bobbin base 17, and reference numeral 18 indicates a slit formed in the bobbin base 17, through which lead wires at each winding start end and winding end of each winding are guided to the terminal pin 16.

In the present invention, the second intermediate flange 14 is connected to a pair of opposing lead wire locking flange 14a, 1
4b, a first non-winding groove 19 for processing the lead wire is formed between the ribs 14a and 14b, the second intermediate collar 14 has a function of locking the lead wire, and a top rib is formed. A lead wire locking collar 20 is formed at a position close to 12, and this collar 20
A second non-winding groove 21 for processing the lead wire is formed between the top rib 12 and the top rib 12. Each middle brim 13
As usual, a large number of slits 22 for inserting lead wires are formed in the radial direction in 15, forming a discontinuous circular collar.

Next, a manner in which a winding wire is wound around the bobbin 10 having the above structure will be described with reference to FIGS. 2 to 6.

First, when winding a winding wire from the top side into the winding space D on the top side of the bobbin, the lead wire S at the winding start end of the winding wire is connected to the locking collar 20 as shown in FIG. Hang it on the hook and secure it, then start winding. That is, since the locking collar 20 is formed and the non-winding groove 21 for processing the lead wire, the lead wire S at the winding start end that is locked by the locking collar 20 is placed in the non-winding groove. Can be pulled around during 21, securely locks,
Can be fixed. On the other hand, when winding ends at the top side, as shown in FIG.
2 to the non-winding groove 21 side, and then pull out the leader line E, the leader line E at the end of the winding
is securely locked and fixed. Next, the case where the winding wire is wound in the winding space B or C in the middle part of the bobbin will be explained. When the winding ends at the top side of the winding space B, as shown in FIG. , 3rd
It can be securely locked and fixed as in the case shown in the figure. In addition, when winding ends on the terminal side of winding space C,
As shown in FIG. 5, the lead wire E at the end of the winding is wound approximately one turn in the non-winding groove 19 and then pulled out to securely lock and fix the wire. In addition, when winding is started from the top side of the winding space B, as shown in FIG. As shown in FIG. 2, by hooking and fixing the wire on the collar 14a and then starting winding, the lead wire S at the end of the winding start can be reliably locked and fixed. It will be easily understood that in the case of FIG. 2, winding may be started after winding approximately one turn in the non-winding groove 21 as in the case of FIG. 6. In addition, in a manner other than the illustrated example, the lead wires at the winding start end and the winding end end of each winding can be connected to the locking collars 14a, 1.
4b, 20 and non-winding groove 1 for processing the lead wire
It is easy to understand that the locking and fixing can be done reliably by using 9 and 21, so the explanation thereof will be omitted. In this way, even if the winding wire is wound in the winding space to its fullest height (the height of the collar), the lead wire E is routed through the non-winding groove to the outer periphery (upper side) of the collar on one side. → The bottom of the non-winding groove → It is pulled out through the outside (upper side) of the other side's collar, and the lead line E
can be pulled out while always being locked to the flange through the slits in the flange on both sides forming a non-winding groove.

In addition, in the above embodiment, the non-winding grooves 19 and 21 for processing the leader wire are illustrated as grooves having a width wider than the wire diameter of the leader wire. Needless to say, it may be fixed. Further, although the present invention has been described in the case where the present invention is applied to a section winding bobbin having four winding spaces, if there are more winding spaces, an additional slit for processing the leader line will be formed. It goes without saying that various other modifications and changes can be made as necessary.

[Effect of idea]

As described above, in the present invention, the second intermediate flange 14 has the function of locking the lead wire, and also has the first non-winding groove 19 for processing the lead wire, and is arranged close to the top of the bobbin. Locking collar 2
0 is provided to form a second non-winding groove 21 for processing the lead wire.
As a result, the lead wire at the start or end of each winding can be securely locked and fixed by the locking collar and the non-winding groove for processing the lead wire. It has the remarkable advantage of greatly improving workability because it does not require work to fix each time. Furthermore, since no adhesive tape is required, winding can be performed using an automatic winding machine. Furthermore, since the non-winding groove for processing the lead wire is a very small gap, at most the bobbin becomes only slightly longer in the axial direction, and not at all in the diametrical direction, so the transformer becomes larger. There isn't. That is, even if the wire is wound in each winding space up to the height of the brim, as shown in FIG. Ha, Tsuba 1
4b side, the collar 14b is pulled out toward the bottom of the non-winding groove 19 while being locked to the collar 14b through the outer periphery (upper side) of the slit 22, and the non-winding groove 19
After going around the bottom of the collar 14a, it is pulled out from the bottom of the non-winding groove 19 toward the outer periphery (upper side) of the slit 22 of the collar 14a, and is pulled out while being locked to the collar 14a through the slit 22 of the collar 14a. Something,
The lead wire E is securely engaged with the collar 14a, and the winding wire can be wound to the full height in the winding space. Therefore, it is possible to wind the bobbin with the same number of turns as before without increasing the length in the axial direction of the bobbin. Of course, since only an extra locking collar is formed, there is no problem in terms of manufacturing cost, and manufacturing is also easy.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an example of a section-wound bobbin used in an embodiment of a transformer for a switching regulator according to the present invention, and FIGS. 2 to 6 show windings wound around the bobbin shown in FIG. 1. FIG. 7 is an explanatory diagram illustrating a manner in which the wire is rotated, and FIG. 7 is an explanatory diagram illustrating a manner in which the lead wire is locked by the bobbin of FIG. 1. 10: Sectional winding bobbin, 13, 14, 1
5: Intermediate collar; 19, 21: Non-winding groove for processing lead wire; 14a, 14b, 20: collar for retaining lead wire.

Claims (1)

[Scope of utility model registration request] A collar is formed near the top rim of the section winding bobbin of a transformer for a switching regulator to lock the lead wire at the start or end of the winding, and there is no winding between them for processing the lead wire. A collar that forms a groove and is located in the middle of the plurality of intermediate ribs of the bobbin is constituted by a pair of opposingly arranged lead wire locking collars, and there is no winding between these collars for processing the lead wire. A transformer for a section-wound switching regulator, characterized by having grooves formed therein.