JPH0139066Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is designed to prevent line-to-line surges (induced lightning, surges caused by the switching of inductive loads, etc.) that enter equipment from power lines or signal lines, and to reduce voltage levels that may be low but The purpose of this product is to provide an absorber for suppressing noise that causes malfunctions and noise in television receivers, radio receivers, etc., which is small and constructed as a single component and is convenient for installation. It is something to do.

In order to protect electronic equipment from abnormal voltages such as those caused by induced lightning, it has conventionally been done to connect a voltage-dependent non-linear resistance element V such as a zinc oxide varistor as shown in FIG. 1a. In the figure, 1 is an input terminal, and 2 is an output terminal. In order to further improve the limiting voltage characteristics, an inductance L is inserted as a current limiting element to limit the surge current, as shown in FIG.
In addition, to remove noise that causes equipment malfunction and noise, ceramic dielectric C is used as shown in Figure c.
and an inductance L is used. Recently, a ceramic dielectric element V' having a non-linear resistance characteristic is constructed with an inductance L to absorb surges and noise as shown in d of the figure. However, since all of these devices connect individual components with lead wires, there are problems such as a large installation space and an increase in the number of connections.In addition, the series inductance caused by the lead wires that connect the elements is large. There are problems such as adverse effects on limiting voltage characteristics and noise suppression characteristics.

The present invention solves these problems by using a single voltage-dependent nonlinear resistor (so-called chip varistor) formed in the shape of a rectangular plate or a ceramic dielectric material having nonlinear resistance characteristics and formed in the shape of a rectangular plate. two inductors (so-called chip inductors)
An inductor is connected to both sides of a voltage-dependent non-linear resistor via an insulator, and one of each pair of end-face electrodes provided on each end face of the voltage-dependent non-linear resistor and inductor is The absorber is configured as a small single component with a three-terminal structure by electrically connecting one side and independently drawing out lead wires from the other end face electrode.

FIG. 2 shows an embodiment of the surge and noise absorber according to the present invention, in which a is a front view and b is a side view. In these figures, reference numeral 3 denotes a substrate of a ceramic dielectric element having a rectangular plate shape and having a voltage-dependent nonlinear resistance characteristic, and end electrodes 4 and 4' are formed on the opposite end faces thereof. 5 and 6 are rectangular plate-shaped inductors having end face electrodes 7, 7' and 8, 8', respectively. These two inductors 5 and 6 have their side surfaces without end electrodes mechanically and firmly bonded to both sides of the substrate 3 without end electrodes with an epoxy adhesive 9 in an electrically insulated manner. An elongated connecting fitting 10 with a groove 11 as shown in the figure
One end face electrode 4 of the substrate 3 and the inductors 5 and 6
These three electrodes are electrically connected by sandwiching the end face electrodes 7 and 8 on each side. Lead wires 12, 13, 14 are independently connected to the other end face electrodes 4', 7', 8' of the substrate 3 and inductors 5, 6 to form external terminals. Note that, although not shown in the drawings, in order to improve weather resistance, the entire structure except for the lead wires is usually coated with a resin.

Connect the lead wire 13 of the surge/noise absorber configured as above to one of the power wires or the signal wire, connect the lead wire 14 to the equipment side, and connect the lead wire 12 to the power wire or the signal wire. The electrical equivalent circuit when connected to the other line is shown in FIG. In the figure, 15 is a protected device.

As is clear from the equivalent circuit in FIG. 4, the inductance component due to the chip inductors 5 and 6 is
It exhibits current limiting and attenuating effects on high frequency components of surges and noise, and acts to further improve the limiting voltage characteristics and noise suppression characteristics of the ceramic dielectric substrate 3 having nonlinear resistance characteristics. In addition, in this invention, 3
It has a terminal structure in which the input and output lines are connected in a straight line between the ceramic dielectric element and the chip inductor, so when individual components are connected as in the conventional example shown in Figure 1(d), There is no inter-line inductance caused by connection lead wires, resulting in improved characteristics, easy installation and connection, and a compact, single-component surge and noise absorber.

In addition, in the above-mentioned example, an example is shown in which a ceramic dielectric material having voltage non-linear resistance characteristics is used, but if a voltage-dependent non-linear resistor such as a zinc oxide pallister is used instead, , an absorber that is effective against surges can be obtained, and when a common ceramic dielectric is used, an absorber that is effective against noise can be obtained.

[Brief explanation of the drawing]

Figures 1a to d are diagrams showing examples of conventional surge and noise absorber circuits, Figure 2 shows an embodiment of the present invention, where a is a front view, b is a side view, and Figure 3 is a diagram of the present invention. FIG. 4, which is a perspective view of the connecting fitting in the invention, is an electrical equivalent circuit of the absorber of the invention. DESCRIPTION OF SYMBOLS 1... Input terminal, 2... Output terminal, 3... Rectangular plate-shaped voltage-dependent nonlinear resistor substrate, 5, 6... Square plate-shaped inductor, 4, 4', 7, 7', 8, 8'... End surface electrode ,
10... Connection fittings, 12, 13, 14... Drawer lead wires, 15... Protected equipment.

Claims (1)

[Claims for Utility Model Registration] 1. Consisting of one square plate-shaped voltage dependent non-linear resistor having electrodes on both end faces and two square plate-like inductors having electrodes on both end faces, The two inductors are connected to both sides of the non-linear resistor through an insulator, and one end electrode of the voltage-dependent non-linear resistor and one end electrode of each of the two inductors are electrically connected. A surge and noise absorber characterized in that the surge and noise absorber is formed as a single component with a three-terminal structure, with lead wires independently drawn out from each of the remaining end face electrodes. 2. The surge and noise absorber according to claim 1, wherein the voltage-dependent non-linear resistor is a ceramic dielectric material having voltage-dependent non-linear resistance characteristics.