KR20190084026A - Varistor module - Google Patents

Abstract

A varistor module is suggested. An external fuse connecting an input terminal and an internal terminal can be formed on one surface of the varistor module. The varistor module includes a varistor stack in which a first electrode pattern and a second electrode pattern are formed, a first insulation terminal formed on the first side of the varistor stack, a first external terminal formed in the first insulation terminal, a second external terminal formed on the second side of the first electrode pattern and connected to the first electrode pattern; and a third external terminal formed on the third side of the varistor stack and connected to the second electrode pattern and a fuse pattern formed on the upper surface of a first insulation element.

Description

Varistor module

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a varistor module for use in automobiles, electronic products, and the like, and more particularly, to a varistor module for preventing damage to a varistor due to overheating, overvoltage and the like.

The recent rapid development of the semiconductor industry accelerates the era of ultra-high integration for miniaturization and high performance of unit devices. As a result, the operating voltage of electronic devices and the like is gradually lowered. On the other hand, due to the surge voltage, the semiconductor device absorbs a large amount of heat energy to burn electronic components, The ability to cope with it has fallen sharply.

Therefore, devices incorporating a semiconductor device are very weak to an excessive voltage, resulting in destruction or deterioration of the device even when a short transient voltage of several tens of milliseconds is introduced, shortening the life span and deteriorating the function. Therefore, development of a varistor This is an important task.

A varistor is a semiconductor device with a high nonlinear current-voltage characteristic. The electrical characteristic is similar to that of a zener diode, which is a constant voltage characteristic, but is a composite ceramic device having larger current and energy capacity.

The nonlinear characteristics of a varistor have a very high electrical resistance at low voltage which is a grain boundary phenomenon that exhibits a nonlinear property that falls off above a certain threshold voltage depending on the microstructure and size of the device. Respectively. Nonlinear resistive operation is controlled by the process occurring at the grain boundary, which is similar to the breakdown phenomenon observed in a back-to-back zener diode, but has the ability to absorb greater energy.

Generally, a varistor is composed of a varistor module including a PTC (Positive Temperature Coefficient) thermistor body (hereinafter referred to as PTC) in order to prevent damage due to overheating and overcurrent. At this time, the PTC is disposed on the input terminal side in order to block overheating, overcurrent, etc. transmitted to the varistor. That is, the PTC prevents an over-current or an over-current input from the outside through the input terminal to be transmitted to the varistor. At this time, the PTC increases the resistance value when the temperature of the varistor becomes higher, thereby reducing the load of the varistor to prevent the varistor from being overheated.

In recent electronic devices, resistance to integrated circuit (IC) is becoming lower along with miniaturization and lowering of voltage, and it is vulnerable to ESD (Electro Static Discharge) and EOS (Electric Shock Stress).

Especially, since EOS that is introduced into electronic equipment has a large energy, when a general protection device is applied, the protection device itself is destroyed to switch to a short mode, or in the worst case, There is a problem of causing a fire.

On the other hand, in the case of surge, the waveform is defined according to the type of occurrence. In the case of a surge occurring in an environment having a large inductance, such as a set assembly line and a communication line such as an EOS (Electric Over Stress) .

In case of a long surge that has a ripple field (waveform lasting in the latter half of the peak value), the energy is so large that it damages the actual set.

TVS Diode is a semi-conductor structure with low current passing area and low repetition surge and low internal resistance. On the other hand, varistor has a multilayer structure of polycrystalline structure with relatively large surge and energy absorption capacity.

As described above, since the varistor has a larger energy absorption capacity than that of the conventional TVS diode, it is suitable for absorbing a long wavelength of a surge wave and is widely used as a protection device.

However, the varistor is short-circuited when a surge exceeding the reference voltage is applied to prevent the varistor from acting as a protection device.

Therefore, a technique of applying a PTC element or applying a thermal fuse element to a varistor in order to limit thermal stress or current characteristics is being developed.

However, there is a problem that difficulties arise in the heterojunction process in applying the PTC element or the thermal fuse element to the varistor.

In addition, when the PCT device or the thermal fuse device is applied, the size of the varistor increases, which makes it difficult to implement the function in the same size, which makes it difficult to apply to a practical product have.

Further, when a varistor element and a thermal fuse element are simultaneously fired due to a low operating temperature when a thermal fuse element is applied, the varistor has a problem that the thermal fuse element is broken at a high firing temperature.

In addition, when a PTC device having an open mode is applied to the varistor, there is a problem that the power consumption and heat generation of the varistor are constantly generated during the short circuit.

Korean Patent Laid-Open No. 10-2009-0112005 (titled: Thermistor-Varistor Composite Chip Device and Manufacturing Method Thereof)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a varistor module in which an external fuse connecting an input terminal and an internal terminal is formed on one surface of a varistor module. That is, the present invention provides a varistor module in which an external fuse is formed by forming a fuse pattern connecting a third external terminal, which is an input terminal, and a second external terminal, which is an internal terminal, on a top surface of a first insulating body laminated on a varistor element The purpose.

Another object of the present invention is to provide a varistor module in which an insulation terminal is formed on one side of a varistor module in which an input terminal is formed to ensure insulation between an input terminal and an internal terminal. That is, according to the present invention, a first insulating terminal is formed on both sides of a varistor element by a termination process, and then a third external terminal, which is an input terminal, is formed to secure insulation with a second external terminal, Another purpose is to provide a varistor module.

According to an aspect of the present invention, there is provided a varistor module including a varistor laminate on which a first electrode pattern and a second electrode pattern are formed, a first insulating terminal formed on a first side of the varistor laminate, A first external terminal formed on the insulating terminal, a second external terminal formed on the second side of the varistor multilayer body and connected to the first electrode pattern, a second external terminal formed on the third side of the varistor multilayer body, 3 external terminals and a fuse pattern formed on the upper surface of the first insulated body.

The varistor laminate includes a varistor element having a varistor sheet on which a first electrode pattern is formed and a varistor sheet on which a second electrode pattern is formed, a first insulating varistor laminated on the varistor element body, and a second insulating varistor element laminated on the lower surface of the varistor element body. . ≪ / RTI >

The first external terminal is connected to the second external terminal via a fuse pattern, the second external terminal is connected to the first protrusion exposed on the second side of the varistor stack body and connected to the first electrode pattern, May be connected to the second protrusion connected to the second protrusion exposed to the third side of the varistor laminate.

The varistor module may further include a second insulating terminal formed on the fourth side surface of the varistor laminate and a fourth external terminal formed on the second insulating terminal.

The fuse pattern may be connected at one end to the first external terminal and at the other end to the second external terminal.

The second side is the exposed side of the first electrode pattern among the sides of the varistor laminate, the third side is the exposed side of the second electrode pattern and the side opposite to the second side, the first side is the second side, It may be a side adjacent to the third side.

According to the present invention, the varistor module is formed by forming a fuse pattern that connects the second external terminal and the third external terminal to the upper surface of the first insulating body stacked on the varistor body, thereby preventing breakage of the varistor module due to overvoltage It is effective.

Further, since the varistor module is formed by forming a fuse pattern on the upper surface of the first insulated body laminated on the varistor body, compared to the conventional varistor module in which the PCT element or the thermal fuse element is added, the varistor module has a high degree of freedom in size, .

Also, since the varistor module is formed by the first insulation terminal and the second insulation terminal through a termination process, it is possible to realize a varistor module that does not have left, right, top and bottom divisions in consideration of mass production.

Also, since the varistor module forms the first insulation terminal and the second insulation terminal through a termination process, it is possible to form a varistor at a lower cost, except for the via hole process for forming the internal terminal.

1 is a view for explaining a varistor module according to an embodiment of the present invention;
Fig. 2 is a view for explaining a varistor element of Fig. 1; Fig.
FIG. 3 is a view for explaining a fuse pattern of FIG. 1; FIG.
4 is a view for explaining the second external terminal of Fig. 1;
Fig. 5 is a view for explaining the third external terminal of Fig. 1; Fig.
6 is a cross-sectional view illustrating a varistor module according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to facilitate a person skilled in the art to easily carry out the technical idea of the present invention. . In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Hereinafter, a varistor module according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 is a view for explaining a varistor module according to an embodiment of the present invention. FIG. 2 is a view for explaining a varistor element of FIG. 1, FIG. 3 is a view for explaining a fuse pattern of FIG. 1, FIG. 4 is a view for explaining a second external terminal of FIG. 1, 3 is a view for explaining the third external terminal of Fig. 1; Fig. 6 is a cross-sectional view of a varistor module according to an embodiment of the present invention.

1, the varistor module 100 includes a varistor element 110, a first insulating body 120, a fuse pattern 130, a second insulating body 140, a first insulating terminal 150, The first external terminal 170, the second external terminal 180, the third external terminal 190 and the fourth external terminal 200 as shown in FIG.

As shown in FIG. 2, the varistor element 110 is formed by stacking a plurality of varistor sheets 111. That is, the varistor element 110 is formed by stacking a plurality of varistor sheets 111 made of a material such as zinc oxide (Zn-O).

The varistor element 110 is formed by alternately stacking a varistor sheet 111 on which a first electrode pattern 113 is formed and a varistor sheet 111 on which a second electrode pattern 117 is formed. The first electrode pattern 113 is formed in a predetermined shape (for example, a quadrangle), and a first protrusion 115 extending from one side (or one side) and connected to the second external terminal 180 is formed do. The second electrode pattern 117 is formed in a predetermined shape (for example, a quadrangle), and a second protrusion 119 extending from the other side (or another side) is formed to be connected to the third external terminal 190. As the varistor sheet 111 is stacked, the first electrode pattern 113 and the second electrode pattern 117 are alternately stacked in the varistor body 110 and are overlapped with each other at a predetermined interval. At least one varistor sheet 111 having no first electrode pattern 113 and second electrode pattern 117 may be stacked on the uppermost layer and the lowermost layer of the varistor element 110.

The first insulated body 120 is composed of one or more insulating sheets and is laminated on the upper surface of the varistor body 110. That is, the first insulated body 120 is formed by stacking one or more insulating sheets formed of an insulating material. Of course, the first insulated body 120 may be made of an insulating tape and attached to the upper surface of the varistor body 110.

The fuse pattern 130 is formed on the upper surface of the first insulated body 120. The fuse pattern 130 is formed on the upper surface of the first insulated body 120 through the printing process after the varistor element 110 and the first insulated body 120 are fired. Here, since the fuse pattern 130 is formed of a metal alloy which melts at a temperature of about 150 to 300 DEG C, simultaneous sintering with the varistor is impossible. Thus, the fuse pattern 130 is formed on the upper surface of the varistor module 100 (that is, the upper surface of the first insulated body 120) after the varistor module 100 is fired.

3, one end of the fuse pattern 130 is connected to the first external terminal 170, and the other end is connected to the second external terminal 180. That is, the fuse pattern 130 is connected to the first external terminal 170, one end of which acts as an input terminal, and the other end of the fuse pattern 130 acts as an internal terminal for applying the inputted voltage or current to the inside of the varistor body 110 2 < / RTI >

The second insulated body 140 is composed of one or more insulating sheets and is stacked on the lower surface of the varistor body 110. That is, the second insulating body 140 is formed by stacking one or more insulating sheets formed of an insulating material. Of course, the second insulating body 140 may be made of insulating tape and attached to the lower surface of the varistor body 110.

The first insulating terminal 150 is formed of an insulating material such as glass and formed on one side of the varistor element 110 and the first and second insulating bodies 120 and 140. The first insulating terminal 150 is formed through a termination process in a state that the first insulating body 120 and the second insulating body 140 are laminated on the varistor body 110. The first insulation terminal 150 secures a gap between the first external terminal 170 and the third external terminal 190 to secure insulation.

The second insulating terminal 160 is formed of an insulating material such as glass so that the other side of the varistor element 110 and the first insulating body 120 and the second insulating body 140 (One side face opposite to the side where the terminal 150 is formed). The first insulating terminal 150 is formed through a termination process in a state that the first insulating body 120 and the second insulating body 140 are laminated on the varistor body 110.

At this time. The second insulating terminal 160 may be omitted since it is a dummy terminal of the fourth external terminal 200. However, considering the mass production of the varistor module 100, the varistor module 100 having no left, . Here, since the second insulation terminal 160 does not have a problem of insulation from the first external terminal 170 and the second external terminal 180, the performance of the varistor module 100 is not affected even if it is not implemented.

The first external terminal 170 is connected to an external circuit (that is, a circuit of an electronic device in which the varistor module 100 is mounted) to receive a voltage generated in an external circuit. The first external terminal 170 is formed on one side of the first insulation terminal 150 and is connected to the second external terminal 180 through the fuse pattern 130. The first external terminal 170 applies a voltage applied from an external circuit to the second external terminal 180 through the fuse pattern 130. Here, the first external terminal 170 is driven by an input terminal to which a voltage of an external circuit is inputted.

The second external terminal 180 is formed on the other side of the varistor element 110, the first insulated body 120 and the second insulated body 140 and is connected to the first electrode pattern 113. 4, the second external terminal 180 is formed on one side of the first electrode pattern 113 on which the first protrusion 115 of the first electrode pattern 113 is exposed, And is connected to the electrode pattern 113. At this time, the second external terminal 180 is connected to the first external terminal 170 through the fuse pattern 130, and the voltage applied through the first external terminal 170 is connected to the first external terminal 170 through the first electrode pattern 113 And is driven by an internal terminal applied to the inside of the varistor element 110.

The third external terminal 190 is formed on one side of the varistor element 110, the first insulating body 120 and the second insulating body 140 and is connected to the second electrode pattern 117. 5, the third external terminal 190 is formed on one side of the second electrode pattern 117 on which the second protrusion 119 is exposed, and the second external protrusion 119 is formed on the second protrusion 119 through the second protrusion 119, And is connected to the electrode pattern 117. At this time, the third external terminal 190 drives the voltage applied to the varistor body 110 through the first external terminal 170 and the second external terminal 180 to an output terminal for applying the voltage to the ground.

The fourth external terminal 200 is a dummy terminal and is formed on one side of the second insulation terminal 160. The fourth external terminal 200 is not connected to the first electrode pattern 113 and the second electrode pattern 117 formed on the varistor element 110.

6, the varistor module 100 includes a plurality of first electrode patterns 113 and a plurality of second electrode patterns 117 in a varistor, The first insulated body 120 and the second insulated body 140 are stacked on the top and bottom surfaces of the varistor body 110 formed alternately. The varistor module 100 includes a first insulating terminal 150 and a first external terminal 170 formed on the left side of the varistor body 110 and a second insulating terminal 160 and a fourth external terminal 170 on the right side. 200 are formed. At this time, the fuse pattern 130 formed on the upper surface of the first insulated body 120 is connected to the first external terminal 170 and the second external terminal 180.

The varistor module 100 has a portion where a third external terminal 190 (i.e., an input terminal) and a second external terminal 180 (i.e., an internal terminal) are formed when a fuse is opened due to an internal short, (I.e., FIG. 6A), the varistor characteristic is developed to form a short mode.

In this case, since it is difficult to realize a completely open type product, the varistor module 100 has a structure in which the first external terminal 170 and the second external terminal 180 are formed A first insulating terminal 150 and a second insulating terminal 160 made of a thin glass material are formed in consideration of dip termination in mass production.

As described above, the varistor module is formed by forming a fuse pattern that connects the second external terminal and the third external terminal to the upper surface of the first insulating body stacked on the varistor body, thereby preventing damage to the varistor module due to overvoltage It is effective.

Further, since the varistor module is formed by forming a fuse pattern on the upper surface of the first insulated body laminated on the varistor body, compared to the conventional varistor module in which the PCT element or the thermal fuse element is added, the varistor module has a high degree of freedom in size, .

Also, since the varistor module is formed by the first insulation terminal and the second insulation terminal through a termination process, it is possible to realize a varistor module that does not have left, right, top and bottom divisions in consideration of mass production.

Also, since the varistor module forms the first insulation terminal and the second insulation terminal through a termination process, it is possible to form a varistor at a lower cost, except for the via hole process for forming the internal terminal.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but many variations and modifications may be made without departing from the scope of the present invention. It will be understood that the invention may be practiced.

100: varistor module 110: varistor element
111: varistor sheet 113: first electrode pattern
115: first protrusion 117: second electrode pattern
119: second protrusion 120: first insulating body
130: Fuse pattern 140: Second insulating body
150: first insulation terminal 160: second insulation terminal
170: first external terminal 180: second external terminal
190: third external terminal 200: fourth external terminal

Claims (8)

A varistor laminate having a first electrode pattern and a second electrode pattern formed thereon;
A first insulating terminal formed on a first side surface of the varistor laminate;
A first external terminal formed on the first insulation terminal;
A second external terminal formed on a second side of the varistor laminate and connected to the first electrode pattern;
A third external terminal formed on a third side of the varistor laminate and connected to the second electrode pattern; And
And a fuse pattern formed on an upper surface of the varistor laminate. The method according to claim 1,
In the varistor laminate,
A varistor element having a varistor sheet on which a first electrode pattern is formed and a varistor sheet on which a second electrode pattern is formed;
A first insulating varistor laminated on an upper surface of the varistor element; And
And a second insulating body which is laminated on a lower surface of the varistor body. The method according to claim 1,
Wherein the first external terminal is connected to the second external terminal via the fuse pattern. The method according to claim 1,
The second external terminal
And the first electrode pattern is connected to the first protrusion exposed to the second side of the varistor laminate, and is connected to the first electrode pattern. The method according to claim 1,
The third external terminal
And the second electrode pattern is connected to the second protrusion exposed to the third side of the varistor laminate, and is connected to the second electrode pattern. The method according to claim 1,
A second insulating terminal formed on a fourth side surface of the varistor laminate; And
And a fourth external terminal formed on the second insulation terminal. The method according to claim 1,
Wherein the fuse pattern comprises:
One end of which is connected to the first external terminal and the other end of which is connected to the second external terminal. The method according to claim 1,
Wherein the second side surface is a side surface of the varistor multilayer body on which the first electrode pattern is exposed and the third side surface is a side exposed to the second electrode pattern and opposed to the second side surface, And one side is a side adjacent to the second side and the third side.

Images