JPS6316282Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a surge absorber that can handle line-to-line surges (induced lightning, switching of inductive loads, etc.) that enter from the power lines and signal lines of electronic equipment, and can cause equipment malfunctions even though the voltage level is low. Between lines and lines that can cause
Regarding a surge absorber for suppressing ground-to-ground noise, the objective is to provide it in a small size and in a single component.

Conventionally, in order to prevent electronic equipment from malfunctioning due to line-to-line and line-to-ground noise, a circuit like the one shown in Figure 1 has been used using a few capacitors or as a single component. There is. For absorbing surge noise between lines, a capacitor 1 is connected in parallel to a voltage-dependent nonlinear resistance element 2 such as a zinc oxide varistor, as shown in FIG. 2. However, such devices have problems with installation space and man-hours, and often do not have sufficient effects.

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. 3 to 6.

Reference numerals 3, 4, and 5 designate first, second, and third ceramic dielectric elements, each having a disk shape and having electrodes 6 on both end surfaces, as shown in FIG. Reference numeral 7 denotes a zinc oxide varistor element, which, like the first, second, and third ceramic dielectric elements 3, 4, and 5, has a disk shape and has electrodes on both end surfaces. 8, 9, 10 are the first external connection terminals,
These are the second and third lead wires. 1st, 2nd, 3rd
Ceramic dielectric element [hereinafter referred to as 1st, 2nd, 3rd]
The ceramic elements 3, 4, 5 and the zinc oxide varistor element (hereinafter referred to as varistor element) are arranged as shown in FIG. 3 to constitute a surge absorber.

First, the first, second and third ceramic elements 3,
4 and 5 are arranged in parallel, and the varistor element 7 is interposed between the first and second ceramic elements 3, 4, and the electrode surfaces of the first, second, and third ceramic elements 3, 4, and The electrode surfaces of the varistor element 7 are such that the electrode surfaces of opposing adjacent elements are connected to each other, and the electrode surface of the varistor element 7 on the first ceramic element 3 side and the electrode surface of the first ceramic element 3 on the varistor element 7 side are connected to each other. and the electrode surface of the third ceramic element 5 on the opposite side from the second ceramic element 4 are connected by a lead wire [or lead plate] 11, and the varistor element 7
The connection portion between the electrode surface on the second ceramic element 4 side and the electrode surface on the varistor element 7 side of the second ceramic element 4 and the electrode surface on the opposite side from the varistor element 7 of the first ceramic element 3. Connected by a lead wire (or lead plate) 12, the first lead wire 8
is connected to the electrode surface of the first ceramic element 3 opposite to the varistor element 7, and the second lead wire 9 is connected to the electrode surface of the third ceramic element 5 opposite to the second ceramic element 4. The remaining third lead wire 10 is connected to the joint between the second ceramic element 4 and the third ceramic element 5. Note that the first, second, and third ceramic elements 3, 4, 5
The electrode surfaces of the varistor element 7 and the electrode surfaces of the opposing adjacent elements can be connected to the electrode surfaces of the opposing adjacent elements by connecting with lead wires or by applying cream solder to each electrode surface. ceramic element 3,
4, 5 and the varistor element 7 are stacked as shown in FIG.
1, 12, etc., and are connected by abutting each other. After connection, a resin coating is applied to improve weather resistance.

With this configuration, the surge absorber can be provided as a single component, and the electrical equivalent circuit consists of a series circuit of the second ceramic element 4 and the third ceramic element 5, and a series circuit of the first ceramic element 4 and the third ceramic element 5, as shown in FIG. The ceramic element 3 and the varistor element 7 are connected in parallel, and one ends 8a, 9 of the first and second lead wires 8, 9
If the third lead wire 10 is connected between the power supply line and the signal line, and one end 10a of the third lead wire 10 is connected to the chassis, ground, etc. of the protected equipment, the voltage may be reduced due to surges or noise that enters between the lines. , large current values are absorbed by the varistor element 7, and for currents below the operating voltage of the varistor element 7, the first ceramic element 3 exhibits a bypass effect, and the first ceramic element 3 exhibits a bypass effect against noise that enters between the line and the ground. The second and third ceramic elements 4 and 5 exhibit a bypass effect. In this way, it becomes an effective surge absorber for surges and noise over a wide range. Further, since the voltage is suppressed to a low level by the varistor element 7, the withstand voltage of the first, second, and third ceramic elements 3, 4, and 5 may be low, and a compact surge absorber can be realized.

In the above embodiment, one each of the first and second lead wires 8 and 9 were provided as the first and second external output terminals, but these were designed to form the electrical equivalent circuit shown in FIG. Additionally, two terminals each may be provided as the first and second external output terminals.

As explained above, according to the present invention, it is possible to provide a surge absorber that exhibits an extremely effective surge absorption effect as a single component, and it is also extremely compact and easy to insert into a printed circuit board, etc. There is no increase in the number of man-hours required for installation.

[Brief explanation of the drawing]

Figures 1 and 2 are conventional surge absorbing circuit diagrams, Figures 3 to 6 show embodiments of the present invention, Figure 3 is an explanatory diagram of the structure of the surge absorber of the present invention, and Figure 4 is A front view of the ceramic dielectric element, FIG. 5 is an electrical equivalent circuit diagram of FIG. 3, and FIG. 6 is an electrical equivalent circuit diagram of another embodiment. 3, 4, 5...first, second, third ceramic dielectric elements, 6...electrode, 7...zinc oxide varistor element [voltage dependent nonlinear resistance element], 8...first lead Wire [first external connection terminal], 9... Second lead wire [second external connection terminal], 10...
Third lead wire [third external connection terminal].

Claims (1)

[Claims for Utility Model Registration] 1. First, second, flat plate having electrodes on both end faces.
A third ceramic dielectric element is arranged in parallel, and the first,
A flat voltage-dependent nonlinear resistance element having electrodes on both end faces is interposed between the second ceramic dielectric element, and the first, second, and third ceramic dielectric elements and the voltage-dependent Opposing electrode surfaces of the nonlinear resistance elements are connected to each other, and a series circuit of second and third ceramic dielectric elements, the first ceramic dielectric element, and the voltage-dependent nonlinear resistance element are connected in parallel. , first and second external connection terminals conductive to both ends of the parallel circuit connected in parallel, and a third external connection conductive to the connection portion between the second ceramic dielectric element and the third ceramic dielectric element. A surge absorber characterized by having a terminal. 2. The surge absorber according to claim 1, wherein the first and second external connection terminals each include two lead wires.