JPH0238423Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transformer for an adapter. (Prior Art) Conventionally, in an adapter transformer equipped with a rectifier circuit, a smoothing circuit, etc. on the secondary side of the transformer body, the flange 2 of the coil bobbin is
It has been common practice to attach a printed circuit board P horizontally to the end of the circuit board P, and to attach circuit components 22 such as rectifying elements and capacitors to the printed circuit board P. In FIG. 6, 23 is an iron core, 24 is a coil, 25 is a plug terminal, and 26 is an adapter case. On the other hand, in this type of adapter, a ventilation hole is generally provided in a part of the case 26, for example, part a' in FIG. 6, in consideration of heat dissipation from the transformer body and circuit components 22. If the printed circuit board P is mounted in such a position, ventilation is obstructed by the printed circuit board P, resulting in a drawback that efficient cooling of the transformer body and the like cannot be performed. In addition, since the printed circuit board P is mounted in a so-called cantilevered manner, when the transformer is assembled into the case 26, the printed circuit board P comes into contact with the inner surface of the case 26, making it easy to shake, resulting in poor assembly workability. This also has the disadvantage of causing wire breakage. (Purpose of the invention) This invention was proposed in view of the above drawbacks.
The purpose of this is to mount the printed circuit board on which the circuit components are mounted on the side of the coil bobbin and approximately parallel to the axis of the coil bobbin, thereby improving ventilation and dissipating heat from the transformer body and circuit components. An object of the present invention is to provide a transformer for an adapter which can enhance the effect and improve the workability of assembling it into an adapter case. (Structure of the invention) The invention will be explained below with reference to the drawings. Figure 1 shows the disassembled state of the coil bobbin of the transformer according to the present invention. In the figure, A indicates the primary coil bobbin and B indicates the secondary coil bobbin. Both of these two-part coil bobbins A and B can be combined. Thus, the coil bobbin of the transformer according to the present invention is formed. Here, in the present proposal, a plug connection terminal to be connected to the primary coil is fixed to the primary coil bobbin, and a plug connection terminal to be connected to the primary coil is fixed to the one coil bobbin, and a plug connection terminal is provided to protrude sideward from an end of the storage portion. A hook-shaped locking portion and a hook-shaped locking portion that extends forward from near the end of the other flange and can expand outward are provided, and these locking portions allow the coil bobbin to The circuit board is characterized in that a printed circuit board for mounting circuit components is mounted substantially parallel to the axis of the motor. First, the primary coil bobbin A includes a winding frame 1 having a substantially rectangular cylindrical shape and flanges 2 and 3 formed at both axial ends of the winding frame 1.
A pair of terminal attachment parts 4 are protruded from the upper surface of the end of the terminal attachment part 4, and a groove formed in the terminal attachment part 4 has a proximal end of a plug connection terminal 5 that can be inserted into an outlet (not shown). The plug connection terminals 5 are erected parallel to the axial direction of the winding frame 1. Next, the secondary coil bobbin B includes a winding frame 6 having a substantially rectangular cylindrical shape, flanges 7 and 8 formed at both ends thereof, side plates 9 and 10 respectively erected on three sides around the flange 7, and an end A plate 11, hook-shaped locking portions 12b and 12b' projecting laterally from the end of the storage portion 13 , which will be described later, and the other flange 8.
It is provided with hook-shaped locking portions 12a and 12a' that extend forward from near the end of the holder and are expandable outward. Then, the latter locking portions 12a, 12 mentioned above
a' has legs 12a for mounting a printed circuit board extending parallel to each other from near the back end of one flange 8 toward the front;
Similarly, the legs 12b and 12b' have legs 12b for mounting a printed circuit board, which project laterally from each end of the side plate 10. The space surrounded by the flange 7, the side plates 9, 10, and the end plate 11 constitutes a storage section 13 for the primary coil bobbin A, and has a size that allows the primary coil bobbin A to be stored coaxially. is formed. Figure 2 shows this secondary coil bobbin B in detail, and as shown in A and B of the figure, the storage section 1 is
At the upper end edges of the side plates 9 and 10 constituting the primary coil bobbin A, there are engaging ribs 9a that can be engaged with grooves 2a (see FIG. 1) formed on both side edges of the flange 2 of the primary coil bobbin A.
10a are provided respectively. Further, a receiving portion 14 is formed at the rear of the storage portion 13 and extends from the end plate 11 in a stepwise manner.
is for receiving a protrusion 5a (see FIG. 1) protruding forward from the base end of the plug terminal 5 of the primary coil bobbin A. Further, a hook-shaped locking end 12a' and a locking end 12b' bent parallel to the end plate 11 are formed at the tips of the legs 12a and 12b, and these locking ends are Between the end portions 12a', 12b' and the edge of the flange 8 or the end plate 11, there is a gap d corresponding to the thickness of the printed circuit board P, which will be described later, as shown in FIG. 2C. Here, the leg portion 12a on the flange 8 side has elasticity, and can be bent so as to expand outward from the flange 8 and can be restored. Further, the inner side of the tip of the locking end portion 12a' has a tapered shape that widens outward, and is designed to facilitate press-fitting of the printed circuit board P when the printed circuit board P is attached, which will be described later. Note that the locking end 1 of the flange 8
A groove 8a for drawing out the coil or lead wire is formed at the edge on the 2a' side. Thus, the coil bobbins A and B wound with the primary coil and the secondary coil are assembled integrally with the primary coil bobbin A stored in the storage section 13 of the secondary coil bobbin B, as shown in FIG. , the lead wire of the primary coil 15 is connected to the protrusion 5a of the plug terminal 5.
Connected to by soldering. On the other hand, as shown in Fig. 4, each coil bobbin A,
A printed circuit board P is formed with cutouts P' at the four corners of a rectangle so as to be engaged with the legs 12a and 12b of B. On this printed circuit board P, circuit components 16 constituting a rectifying/smoothing circuit, etc. are mounted. Implement it as appropriate in advance. Then, as shown in FIG. 3, the upper end of the printed circuit board P is first inserted so that the notch P' is engaged with the locking end 12b' on the side of the storage section 13 , and then the printed circuit board P is inserted. By pressing the lower end against the inner tapered surface of the locking end 12a' on the flange 8 side, the locking end 12a' is expanded laterally and elastically returned to lock the notch P'. End 12
The printed circuit board P is fixed to the inside of the coil bobbin, thereby integrally attaching the printed circuit board P to the coil bobbin. Thereafter, the lead wire of the secondary coil 17 is appropriately connected to the circuit component 16 via the printed circuit board P, and the iron core C is incorporated, thereby forming the adapter transformer according to the present invention as shown in FIG. In addition, in FIG. 5, 18 indicates the case of the adapter. In the present invention configured in this manner, the printed circuit board P is securely placed between the end of the storage section 13 of the secondary coil bobbin B and the vicinity of the end of the other flange 8 by the legs 12a and 12b. and is arranged almost parallel to the axis of the coil bobbin, for example, if a ventilation hole is provided in part a of the case 18 of the adapter in FIG. 5, the printed circuit board P will prevent ventilation. There is no risk of being
Heat dissipation from the transformer body and circuit components 16 is extremely effective. (Effects of the invention) As described above, according to the invention, a storage portion for storing the other coil bobbin is formed around the outer periphery of one flange of one coil bobbin, and the primary coil bobbin and the secondary coil bobbin are arranged coaxially. In the adapter transformer, a plug connection terminal connected to the primary coil is fixed to the primary coil bobbin, and the one coil bobbin has a protruding sideward from an end of the storage portion. A hook-shaped locking portion is provided, and a hook-shaped locking portion extends forward from near the end of the other flange and is expandable outward. By mounting the printed circuit board for mounting circuit components almost parallel to the axis of the coil bobbin, it is possible to create an arrangement structure in which the printed board does not interfere with ventilation when it is assembled into the case of the adapter. This has the effect of providing an adapter with a higher heat dissipation effect than conventional ones. In addition, since the printed circuit board and circuit components are arranged almost to the side of one coil bobbin, there are no protrusions along the plane of the flange, making it easy to assemble the adapter into the case and improve workability. This has the advantage that it is possible to improve the performance of the printed circuit board, and also to prevent the occurrence of wire breakage accidents caused by the printed circuit board being caught. In addition, since the structure can hold the four corners of the printed circuit board, the printed circuit board can be supported more reliably than the conventional cantilevered support structure.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment of the present invention, in which Figure 1 is an exploded perspective view of a coil bobbin, Figure 2A is a plan view of a secondary coil bobbin, and Figure 2B is a -
The figure is a perspective view of a printed circuit board, FIG. 5 is a side view of the present invention, and FIG. 6 is a side view of a conventional example. A...Primary coil bobbin, B...Secondary coil bobbin, P...Printed circuit board, 7, 8...flange, 11...end plate, 13 ...storage section, 16...circuit component.

Claims (1)

[Claims for Utility Model Registration] For an adapter in which a primary coil bobbin and a secondary coil bobbin are coaxially combined, with a storage section formed around the outer periphery of one flange of one coil bobbin to store the other coil bobbin. In the transformer, a plug connection terminal to be connected to the primary coil is fixed to the primary coil bobbin, and a hook-shaped engaging member is provided on the one coil bobbin to protrude laterally from an end of the storage portion. A stop portion and a hook-shaped locking portion that extends forward from near the end of the other flange and can expand outward are provided, and these locking portions allow the coil bobbin to be attached to the axis of the coil bobbin. A transformer for adapters characterized by a printed circuit board for mounting circuit components mounted almost in parallel.