JP2537787B2 - Power supply - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device used in various OA equipment and the like.

2. Description of the Related Art A conventional power supply device of this type has a configuration as shown in FIGS. In FIG. 3, 1 is an insulating case,
2 is a printed circuit board incorporating a step-up transformer, components that form a rectifying circuit, and components that form a control circuit.
Is a slit provided in the insulating case 1, 5 is an external ground terminal incorporated from the outside of the insulating case 1 by utilizing the slit 4, and 6 is a conductive pattern of the printed circuit board 2. In FIG. 4, 1 is an insulating case, 2 is a printed circuit board in which various parts are similarly incorporated, 4 is a slit, 5 is an external ground terminal, and 3 is a jump lead wire. In the case of FIG. 3, the external ground terminal 5 is passed through the slit portion 4 of the case 1 and the GND pattern is drawn around by the conductive pattern 6
The external ground terminal 5 was connected to the ND location by soldering.

Next, in the case of FIG. 4, there are two methods of connecting the external earth terminal 5 through the slit 4 of the case 1 to a part of the GND of the printed circuit board 2 by the jump lead wire 3 and the external earth terminal 5 by soldering. Had an external ground connection.

Problems to be Solved by the Invention In such a conventional configuration, it is necessary to provide a place for soldering in the case of FIG. Since a space for performing the patterning is required, the pattern routing on the printed circuit board 2 becomes very complicated and the printed circuit board 2 becomes large, which makes it difficult to reduce the size of the unit. In the case of FIG. 4, in the method of connecting the ground using the jump lead wire 3 as a jumper, the external ground terminal 5 vibrates when a force is applied to the external ground terminal 5, so a fixing mechanism is required. Further, since the jump lead wire 3 is used, the number of steps is increased, and a troublesome work is required, which requires a long time for assembling, a work efficiency is lowered, and a cost is increased.

Therefore, the present invention solves the above problems, and by simply inserting the external ground terminal through the slit or through hole of the insulating case, soldering can be performed simultaneously with the ground terminal of the step-up transformer, and the external ground terminal can be securely fixed. age,
The purpose is to reduce man-hours, improve productivity, and reduce costs.

Means for Solving the Problems In order to solve this problem, the present invention stores a printed circuit board in which a step-up transformer, a component forming a rectifying circuit, and a component forming a control circuit are incorporated in an insulating case. The ground terminal of the step-up transformer projecting on the printed circuit board is incorporated from the outside of the insulating case by a through hole or slit provided in the insulating case, and has a two-pronged tongue connected to the ground terminal at the tip protruding inward. An external earth terminal is incorporated, and the two-forked tongue piece is sandwiched between the earth terminal and soldered.

With this configuration, the external ground terminal provided on the insulating case can be easily installed, and there is no need to provide a special soldering part for separately installing the external ground.
Also, since no pattern is required, it is very easy when designing a printed circuit board and the size can be reduced. Further, since the lead wire is not used as a jumper, the cost can be reduced and the man-hours can be reduced, and the productivity can be improved.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 7 is an insulating case, 8 is a step-up transformer,
A printed circuit board incorporating a component forming a rectifying circuit or a component forming a control circuit, 9 is a ground terminal of a step-up transformer, 10 is a through hole or slit provided in the insulating case 7, 11
Is an external ground terminal, and 12 is a conductive pattern. In FIG. 2, the external ground terminal 11 is assembled through the through hole or slit 10 in the insulating case 7 incorporating the printed circuit board 8 and soldered to the ground terminal 9 of the step-up transformer by the solder 13. In the above embodiment, when soldering the external ground terminal 11 to the ground terminal 9 of the step-up transformer, the tip of the external ground terminal 11 is formed into a bifurcated shape so as to sandwich the ground terminal 9 of the step-up transformer. By attaching the earth terminal 9 with this tongue piece 11a and soldering it, it is possible to obtain an external earth terminal 11 having a higher mounting strength than that which is simply soldered to the earth terminal 9 of the step-up transformer. .

When the tongue piece 11a is sandwiched with the ground terminal 9, it can be sandwiched with the through hole or the slit 10 as a fulcrum, so that the tongue piece 11a can be easily sandwiched and, as is apparent from FIGS. By positioning the bent portion 9a of 9 along the insertion hole 7b of the terminal mounting portion 7a of the insulating case 7, the grounding terminal 9 can be positioned very easily, and the tongue piece 11
It is easier to insert the a into the ground terminal 9.

EFFECTS OF THE INVENTION As described above, according to the present invention, a printed circuit board in which a step-up transformer, a component that forms a rectifier circuit, and a component that forms a control circuit are incorporated is housed in an insulating case and is projected onto the printed circuit board. Since the step-up transformer ground terminal incorporates an external ground terminal that has a tongue that protrudes inward from the outside of the insulating case through a through hole or slit provided in the insulating case and is connected to the ground terminal at the tip, jump to the lead wire. Is unnecessary, the number of assembly steps is reduced, the productivity is improved, and the cost of the lead wire can be reduced. Also, the printed circuit board does not have to be large in size by separately providing a ground pattern for an external ground terminal, and the size can be reduced.

Further, since the earth terminal is sandwiched by the tongue-like shape of the external earth terminal to be soldered, the mounting strength can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of a power supply device according to an embodiment of the present invention, FIG. 2 is a perspective view of the main part in an assembled state, and FIGS. 3 and 4 show a conventional power supply device, respectively. It is a perspective view of an important part. 7 ... Insulation case, 8 ... Printed circuit board, 9 ... Step-up transformer ground terminal, 10 ... Through hole or slit, 11 ...
… External ground terminal, 11a …… tongue, 12 …… conductive pattern, 13 …… solder.

Claims (1)

(57) [Claims] 1. A printed circuit board incorporating a step-up transformer, a part composing a rectifier circuit, and a part composing a control circuit is housed in an insulating case, and the ground terminal of the step-up transformer protruding from the printed circuit board is insulated. An external ground terminal having a two-pronged tongue projecting inward from the outside of the case by a through hole or a slit provided in the insulating case and connected to the above-mentioned ground terminal at the tip is incorporated, and this two-pronged tongue is described above. A power supply unit that is sandwiched between ground terminals and soldered.