JPS6041691Y2 - surge absorber - Google Patents

Description

[Detailed description of the invention] This invention relates to a surge absorber, especially one that is attached to a printed circuit board with a large number of ICs mounted thereon, and its purpose is to contribute to improving the mounting density of ICs on the IC printed circuit board. It's about providing something.

Conventionally, in order to absorb surges and noise that enter from the power supply line on printed circuit boards with a large number of ICs mounted, acid (tJ4 varistors, capacitors, etc.) were individually connected between the IC power supply section and the ground to absorb surges. The circuits are connected, but in order to provide such a surge absorption circuit, it is necessary to print a pattern on each of them, and the power supply bus bar also needs to be printed quite large, so the surge absorption circuit must be printed individually. Since this requires a very large area together with the size of the protective components, it has been impossible to increase the packaging density of the IC.

In contrast, the present invention can avoid the above-mentioned problems, and embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

Reference numeral 1 designates a zinc oxide varistor element (hereinafter referred to as a varistor element) as a voltage-dependent nonlinear resistance element, which has a rectangular plate shape and has electrodes 2, 2 on both end faces.

Reference numeral 3 designates a first electrode plate, which has first external connection terminals 4, 4 bent into an L-shape at both ends of one side edge 3a.

4a is a screw hole drilled in the first external connection terminals 4, 4;
Reference numeral 5 denotes a second electrode plate, and second external connection terminals 6, 6, .

The varistor element 1 and the first and second electrode plates 3 and 5 constitute a surge absorber as follows.

The first electrode plate 3 and the second electrode plate 5 are arranged side by side as shown in FIG. 3, and the varistor element 1 is interposed between the first and second electrode plates 3°5. One electrode 2 and the first electrode plate 3 are electrically and mechanically connected firmly, and the other electrode 2 and the second electrode plate 5 are electrically and mechanically connected firmly. .

Note that the surge absorber configured in this manner is usually further coated with resin to improve weather resistance.

In the surge absorber of the present invention constructed in this way, the first external connection terminal 4.4 is attached with a screw to the grounding part of the printed circuit board on which the ICs 7, 7, etc. are mounted, as shown in Fig. 4. , the second external connection terminal 6゜6... is connected to each IC7, 7.
It is attached so that it is connected to the power pin of ....

FIG. 5 shows an electrical equivalent circuit of the surge absorber of the present invention, and 8, 8, . . . represent surge absorbing elements.

In this way, it is possible to replace a large number of surge absorbers with a single component and to make it compact, and it is possible to improve the mounting density of the printed circuit board to which it is attached.

In addition, first external connection terminals 4, 4 at both ends of the first electrode plate 3
It is useful as a reinforcing material for printed circuit boards because it fixes them to printed circuit boards.

Furthermore, since the second electrode plate 5 is configured to be able to function as a power supply bus of a printed circuit board, there is no need to wire a power supply line to each IC, which is preferable in terms of printed wiring.

As explained above, the surge absorber of the present invention has relatively strong strength, and although it replaces many surge absorbers, it has a relatively thin plate-like compact shape. Since the surge absorber is used by standing on a printed circuit board, the area occupied on the printed circuit board can be made very small, and this can contribute to improving the mounting density of the circuit board on which the surge absorber is mounted.

Moreover, since it can also serve as a power supply bus for a printed circuit board, it is also preferable in terms of printed wiring.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a front view of a zinc oxide varistor element, Fig. 2 is a view taken along the line X-X in Fig. 1, and Fig. 3 is an external perspective view of a surge absorber. FIG. 4 is an explanatory diagram of the mounting state, and FIG. 5 is an electrical equivalent circuit diagram of FIG. 3. 1... Zinc oxide varistor [voltage-dependent nonlinear resistance element], 2, 2... Electrode, 3... First electrode plate, 4...・First external connection terminal, 5・
...Second electrode plate, 6...Second external connection terminal.

Claims (1)

[Scope of utility model registration request] a first external connection terminal having a first external connection terminal bent in an L-shape;
and a second electrode plate having second external connection terminals arranged at predetermined intervals are arranged side by side, and a flat voltage plate having electrodes on both end surfaces is placed between the first and second electrode plates. A surge absorber characterized in that each electrode surface is connected to an electrode plate with a dependent nonlinear resistance element interposed therebetween.