JPS5915473Y2 - surge absorber - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a surge absorber in which a capacitor is connected in parallel with a voltage non-linear resistor.

Voltage nonlinear resistors are currently widely used as surge absorbers by utilizing their voltage-current characteristics, but they do not exhibit a surge absorption effect at voltages below the varistor voltage.

On the other hand, capacitors are used to absorb and remove minute surges or noise due to their high-frequency component bypass effect, but they lose their bypass effect against surges that have a relatively long duration and a high voltage peak value. For surges that do not exhibit an absorption effect, that is, long wave tails and high wave peak values, voltage nonlinear resistors absorb them, and for noisy surges that have low wave peak values and short wave tails that are below the varistor voltage, capacitors absorb them. It is sufficient to bypass the voltage, and in the past, the voltage nonlinear resistor and the capacitor were connected in parallel.

However, when the individual components are simply connected in parallel in this way, the following drawbacks arise, and the effect cannot be fully exhibited.

(1) When connecting both to a predetermined circuit with lead wires, the effective impedance of the lead wires of the individual components (voltage nonlinear resistor and capacitor) is inevitably large due to the long lead wires, resulting in high frequency noise absorption performance. becomes worse.

In particular, capacitors are rarely used alone, but two are connected in parallel to increase the capacitance. The effective impedance of

(2) Two parts are connected in parallel and then connected to a surge source, such as a relay coil at both ends, or between contacts, making it difficult to arrange spatially or impossible to install. The larger the shape becomes, the larger the shape becomes.

(3) Even if the part numbers of the parts to be connected in parallel are specified in advance for both parts, the optimum combination of characteristics may not always be achieved due to the characteristic tolerances of the parts. It is necessary to narrow the tolerances of parts to prevent the above-mentioned situation from occurring, which causes a rise in prices.

(4) Since both parts are finished as individual parts and connected in parallel, protective coating,
There are overlapping parts such as lead wires, which increases man-hours and material costs.

In this way, simply connecting a voltage nonlinear resistor and a capacitor in parallel has more disadvantages than connecting both components in parallel to increase the surge absorption effect, and is not practical. Ta.

The present invention has been devised to solve these conventional problems, and the surge absorber of the present invention will be explained below with reference to the drawings of FIGS. 1 to 5.

Fig. 1 and Fig. 2 a, l) show a surge absorber according to an embodiment of the present invention, and Fig. 3 a, l) show its main parts. 2 is a plate-shaped voltage nonlinear resistor printed with paste solder; and 2 is a plate-shaped ceramic dielectric body with paste solder printed on both electrodes.

Reference numeral 3 designates two lead terminal plates, which are connected to the electrodes of the voltage non-linear resistor 1 and the two ceramic dielectrics 2, facing each other, as shown in FIG. 3a. Electrode connection parts 3a, 3a' and this electrode connection part 3a
, 3a', and a lead terminal 3C drawn out from the connecting part 3b. It is constructed by punching out and making incisions as shown in Fig. 3, and then folding it as shown in Fig. 3a.

And electrode connection parts 3a, 3a' of this lead terminal plate 3
is brought into contact with the voltage nonlinear resistor 1 and the electrodes of the two ceramic dielectrics 2 as shown in Fig. 2a and b, and in this state, heat treatment is performed at around 200°C for about 10 minutes to clean the flux. Accordingly, the electrode connection portion 3a of the lead terminal plate 3,
3a' can be connected to the electrodes of one voltage non-linear resistor 1 and two ceramic dielectrics 2, thereby connecting one voltage non-linear resistor 1 and two ceramic dielectrics 2 in parallel. It is possible to obtain an assembly connected to the .

Here, the width of the connecting portion 3b of the lead terminal plate 3 used in the present invention is equal to the thickness of the two element bodies of the voltage nonlinear resistor 1 and the ceramic dielectric 2 plus the thickness of the lead terminal plate 3. It is necessary to make them the same, and it is also necessary to keep the dimensions so that they do not touch the sides of the element body.

Reference numeral 4 denotes an exterior body that covers this assembly. This exterior body 4 is made of a resin case and molding resin. The assembly of the present invention is packaged by molding the assembly with resin.

As is clear from the above configuration, in the surge absorber according to the present invention, the distance between the connections of one voltage nonlinear resistor 1 and two ceramic dielectrics 2 is as short as possible. The effective impedance to high frequencies is smaller than when the bodies are individually connected by lead wires, and the ability to absorb high frequency noise does not deteriorate. Because of this, it is possible to obtain a product with a small size even when a large number of them are connected in parallel.

In addition, since the characteristics of the elements to be connected in parallel can be selected in advance, the optimum combination can be achieved with a high yield.Furthermore, since the exterior is applied to the integrally connected assembly, materials and man-hours are reduced. can be reduced, and low-cost manufacturing can be obtained.

In addition, FIGS. 4 and 5 a and l) show the main parts of a surge absorber according to another embodiment of the present invention, and in this embodiment, the capacitance connected to the voltage nonlinear resistor 1 is increased. In the case where five ceramic dielectrics 2 are used for this purpose, in addition to the two lead terminal plates 3 explained in the above embodiment, there are
A connecting plate 5 as shown in b is used.

That is, as shown in FIG. 5a, the connection plate 5 has electrode connection parts 5a and 5a' facing each other connected to the electrodes of the voltage nonlinear resistor 1 and the ceramic dielectric 2, and the electrode connection parts 5a, 5a', and a connecting portion 5b that connects the connecting plates 5a', and the connecting plate 5 is constructed by punching into a predetermined shape and bending, as shown in FIG.

If there are a large number of ceramic dielectrics 2 as shown in this embodiment, they can be easily connected in parallel by using the connection plate 5.

Further, in the case of this embodiment as well, effects similar to those described above can be obtained.

In the present invention, the number of voltage nonlinear resistors 1 is not limited to one, but two may be used.

As described above, the surge absorber of the present invention can effectively absorb surges with long wave tail high wave peak values and short wave tail low wave peak values.Moreover, the effective impedance for high frequencies is small, and the absorption ability for high frequency noise is poor. It is of high practical value because it does not cause any damage and can be made small and inexpensive.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the external appearance of a surge absorber according to an embodiment of the present invention, Fig. 2 a, l) are sectional views and front views showing the main structure, and Fig. 3 a, b are the same. FIG. 4 is a sectional view showing the main structure of a surge absorber according to another embodiment of the present invention; FIG.
, l) is a perspective view and a developed view showing the main parts thereof. DESCRIPTION OF SYMBOLS 1... Voltage nonlinear resistor, 2... Ceramic dielectric, 3... Lead terminal board, 3a, 3
a'... Electrode connection part, 3C... Drawer lead part, 4... Exterior body.

Claims (1)

[Scope of utility model registration request] at least two plate-shaped ceramic dielectrics having electrodes on both sides, at least one plate-shaped voltage nonlinear resistor having electrodes on both sides, and connected to the electrodes of the ceramic dielectric and the voltage nonlinear resistor. a two-plate lead terminal board having an electrode connection part and an extraction lead part facing each other and connecting the ceramic dielectric and the voltage non-linear resistor in parallel; and the extraction lead part of this lead terminal board. and an exterior body that is exposed to the outside and covers the ceramic dielectric and the voltage nonlinear resistor.