JPH0529112A - Surge noise absorber provided with protective function - Google Patents

Abstract

PURPOSE:To prevent burning or fuming of an element in the case where a surge current or circuit voltage above the rating is applied and prevent the apparatus being used from being damaged, in a surge noise absorber provided with protective function used for electric apparatus. CONSTITUTION:A lead wire 12 is connected to one electrode of a dielectric element 11 which has electrodes on both ends and has varistor property, and two lead wires 13 and 16 are connected to the other electrode of the element 11, and a current fuse 14 is connected to, at least, one lead wire 13, and also bead-shaped magnetic substances 15 and 17 pierce the two lead wires 13 and 16. The current fuse 14 fuses at the time of abnormality by the current above the rating thereby preventing burning or fuming of the element 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to surges (inductive lightning, surges caused by opening and closing an inductive load, etc.) that enter between lines such as power supply lines and signal lines, and between lines and ground, and voltage levels are low. The present invention relates to a surge noise absorber that suppresses noise that causes malfunctions and noise in television receivers, radio receivers, and the like.

[0002]

2. Description of the Related Art Conventionally, this kind of surge noise absorber has been
As shown in FIG. 3, it was configured by connecting individual parts.
In FIG. 3, 1 is a voltage-dependent nonlinear resistance characteristic (hereinafter,
Dielectric element with varistor characteristics) protects electronic devices from abnormal voltage such as inductive lightning that enters between lines and between line and ground, and removes noise that causes device malfunction. To do. In addition, 2 and 3 are inductance elements that are inserted and connected in series to the power supply line,
One end of the element 1 is connected to the intermediate contact. The inductance elements 2 and 3 have a role as a current limiting element for limiting a surge current and a function as a blocking element for noise of high frequency components.

Recently, as an attempt to integrate such a structure, a surge noise absorber as shown in FIG. 4 has been considered. In FIG. 4, reference numeral 4 denotes a dielectric element having varistor characteristics, one end surface electrode of which is connected to an external connection lead wire 5 and the other end surface electrode of which is similarly connected to the external connection lead wires 6 and 7. Are provided with bead-shaped magnetic bodies 8 and 9 penetrating therethrough, respectively.

Further, instead of the dielectric elements 1 and 4 having the above varistor characteristics, a voltage-dependent nonlinear resistance element (hereinafter, referred to as
A varistor element) is also used.

[0005]

However, in the above-mentioned conventional configuration, since the dielectric element or the varistor element having the varistor characteristic is used in all cases, when the surge current or the circuit voltage higher than the rated value is applied, the element is Had a problem that it was short-circuited and destroyed, burning or smoke was generated, or the equipment used was damaged.

An object of the present invention is to solve the above-mentioned problems of the prior art, and to provide a compact and highly sophisticated surge noise absorber with a protective function, which prevents burning and smoke generation in the event of an abnormality. ..

[0007]

In order to achieve this object, a surge noise absorber with a protective function of the present invention has a voltage-dependent non-linear resistance element (varistor element) or voltage-dependent non-linear resistance element having electrodes on both end surfaces. Linear resistance characteristics (varistor characteristics)
Two lead wires are connected to one end surface electrode of the dielectric element having a, and a current fuse or a temperature fuse is connected to a part of at least one of the lead wires, and these two lead wires are respectively connected. A bead-shaped magnetic body is penetrated to form a lead wire for external connection, and a lead wire connected to the other end surface electrode of the element is also used as a lead wire for external connection.

[0008]

According to this structure, the current fuse or the thermal fuse is inserted between the inductance element and the varistor element or the dielectric element having the varistor characteristic, and an abnormality occurs such that an abnormal current flows through the element. In such a case, the fuse operates due to the current flowing through the element or the heat generation of the element, and it is possible to prevent the element from burning and smoking.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 11 is a dielectric element having varistor characteristics in which electrodes (not shown) are provided on both end surfaces, and a lead wire 12 is connected to one end surface electrode as a lead wire for external connection. Has been done. A lead wire 13 is connected to the other end surface electrode of the element 11, a current fuse 14 is connected to the lead wire 13, and the lead wire 13 penetrates a bead-shaped magnetic body 15 for external connection. It is a lead wire 13a. A lead wire 16 is connected to the other end surface electrode of the element 11, and the lead wire 16 penetrates a bead-shaped magnetic body 17 to become a lead wire 16a for external connection.

Although not shown, the dielectric element 11 and the bead-shaped magnetic bodies 15 and 17 are integrated with an adhesive or the like and further covered with a resin.

The lead wires 13a and 12 of the surge noise absorber having the above structure are connected to the power supply line or the signal line side,
When the lead wires 16a and 12 are connected to the protected device side, the electrical equivalent circuit is as shown in FIG.
Is a protected device. And the bead-shaped magnetic body 1
The inductance components 5 and 17 exhibit a current limiting and blocking effect on the high frequency component of the surge noise, and the surge noise absorbing characteristic is enhanced in combination with the limiting voltage characteristic and the noise suppressing characteristic of the dielectric element 11 having the varistor characteristic. Further, the current fuse 14 is blown when an abnormal current flows through the dielectric element 11 to prevent the dielectric element 11 from being burnt or smoking. Further, in this embodiment, since the input / output lead wires are integrated on the main body, the line inductance caused by the connecting lead wires becomes extremely small as compared with the case where individual components are connected, and therefore The characteristics are improved.

In the above embodiment, the case where the current fuse 14 is connected only to the lead wire 13 side has been described, but this may be inserted only in the lead wire 16 side. It may be put in both 16.

Further, a thermal fuse may be used instead of the current fuse, and when an abnormality occurs in the dielectric element, the thermal fuse may be operated by the heat generated to prevent the element from being burnt or smoking. is there.

Further, even if a varistor element is used instead of the dielectric element having varistor characteristics, the present invention can of course obtain the same effect as above.

[0016]

As is apparent from the above description, in the surge noise absorber of the present invention, the current fuse or the temperature fuse provided in the lead wire portion prevents the element from being burnt or smoking in an abnormal case. And the function of the inductance component by the bead-shaped magnetic material,
By combining the characteristics of the varistor element or the dielectric element having varistor characteristics, surge noise can be effectively absorbed.

Further, it has an effect of not damaging the equipment being used, and its practical value is great.

[Brief description of drawings]

FIG. 1 is a front view showing a surge noise absorber with a protection function according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram for explaining the operation of the surge noise absorber of the present invention in an actual use state.

FIG. 3 is an equivalent circuit diagram for explaining a conventional surge noise absorber.

FIG. 4 is a front view showing a conventional surge noise absorber.

[Explanation of symbols]

 11 Dielectric element 12, 13, 16 Lead wire 13a, 16a Lead wire for external connection 14 Current fuse 15, 17 Bead-shaped magnetic material 18 Protected device

Claims (1)

Claim: What is claimed is: 1. Two lead wires are connected to one end face electrode of a voltage-dependent nonlinear resistance element having electrodes on both end faces or a dielectric element having voltage-dependent nonlinear resistance characteristics. A current fuse or a thermal fuse is connected to a part of the at least one lead wire, and these two lead wires are made to penetrate through a bead-shaped magnetic material to form lead wires for external connection, and A surge noise absorber with a protective function, wherein the lead wire connected to the other end surface electrode of the above element is also used as a lead wire for external connection.