KR20120111214A - Varistor module - Google Patents

Abstract

PURPOSE: A varistor module is provided to prevent damage to a varistor due to an over current by reducing power supply to a varistor small body when temperature of the varistor module is increased. CONSTITUTION: Terminal parts(110a,110b) are used as an input terminal and an output terminal. A varistor part is laminated on the top of the terminal parts. Electrode parts(130a,130b) are laminated on the upper surface of the varistor part. An element protection part(140) is laminated on the top of the electrode parts. A resistance value of the element protection part is increased when temperature of the varistor part is increased. The terminal parts comprise a pair of terminal patterns.

Description

Varistor module

The present invention relates to a varistor module for use in automobiles, electronic products, and the like, and more particularly, to a varistor module that prevents damage to a varistor due to overheating and overcurrent.

The recent rapid development of the semiconductor industry is accelerating the era of ultra high integration for miniaturization and high performance of unit devices. As a result, operating voltages of electronic devices, etc., tend to gradually decrease, while the inflow of surge voltages dissipates large thermal energy enough to burn electronic components, thereby rapidly decreasing the energy capacity of semiconductors. Coping ability fell significantly.

Therefore, since the devices incorporating semiconductor devices are very weak to transient voltages, even when a short transient voltage of several tens of ms is destroyed, the devices are destroyed or degraded, resulting in shortened lifespan and reduced function. This is an important task.

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

The nonlinear nature of varistors has a very large electrical resistance at low voltages, which are grain boundary phenomena that show a sharp drop in nonlinearity above the threshold voltage in some regions, depending on the microstructure and size of the device. Has Nonlinear resistance behavior is controlled by processes occurring at grain boundaries, similar to the break down phenomenon observed in back-to-back zener diodes, but with the ability to absorb more energy.

In general, a varistor is composed of one varistor module including a PTC (Positive Temperature Ccefficient) thermistor element (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 to block overheating, overcurrent, and the like transmitted to the varistor. That is, the PTC blocks the overheat and overcurrent input from the outside through the input terminal to prevent the transfer to the varistor. At this time, when the temperature of the varistor increases, PTC increases the resistance value, thereby reducing the load of the varistor to prevent the varistor from overheating.

However, in the conventional varistor module, when the input terminal and the output terminal are interchanged and connected, PTC is positioned at the rear end of the varistor in an equivalent circuit for protecting the varistor from overheating. Then, the conventional varistor module has a problem in that the varistor is damaged due to the overheating and the overcurrent not being blocked by the PTC when an external overheating or overcurrent is inputted to the output terminal due to the overheating of the varistor.

However, in the conventional varistor module, when the input terminal and the output terminal are connected to each other, the varistor module has a problem in that an explosion is generated as it is transmitted to the varistor as it is input from the outside through the output terminal. That is, the conventional varistor module is supplied with the current through the output terminal to the PTC through the varistor. At this time, even if the varistor is overheated and the resistance value of PTC rises, the current supplied to the varistor is maintained as it is, so that the temperature of the varistor continues to rise (ie, explosion).

In addition, when the conventional varistor module is used for a vehicle, there is a problem in that the varistor is broken because the inverted current (that is, overcurrent) generated by a load dump, a quick start, etc. of the vehicle cannot be blocked. .

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-described conventional problems, and an object thereof is to provide a varistor module which always keeps a protection element at the front end of a varistor element regardless of the connection direction of an input terminal and an output terminal of the varistor module. .

In addition, another object of the present invention, the varistor module for preventing the damage of the varistor element by the inverted current (that is, overcurrent) by placing the protection element in front of the varistor element irrespective of the connection direction of the input terminal and the output terminal. In providing.

In order to achieve the above object, a varistor module according to an embodiment of the present invention includes a terminal unit which operates as an input terminal and an output terminal; A varistor part stacked on top of the terminal part; An electrode unit stacked on an upper surface of the varistor unit; And an element protection unit stacked on the electrode unit.

The terminal portion includes a pair of terminal patterns spaced apart from each other to operate as an input terminal and an output terminal.

The electrode unit includes a pair of electrode patterns stacked on the upper surface of the varistor unit and spaced apart from each other.

The element protection part is formed of a PTC thermistor.

In order to achieve the above object, a varistor module according to another embodiment of the present invention includes a first terminal unit which operates at least one of an input terminal, an output terminal, and a ground terminal; A first varistor unit stacked on the first terminal unit; A first electrode part stacked on the first varistor part; An element protection unit stacked on the first electrode unit; A second electrode part stacked on the device protection part; A second varistor unit stacked on the second electrode unit; And a second terminal part stacked on the second varistor part and operating as at least one of an input terminal and an output terminal.

The first terminal unit may include a first terminal pattern operating as an input terminal or an output terminal; And a second terminal pattern formed to be spaced apart from the first terminal pattern to operate as the ground terminal.

The first electrode part includes a pair of electrode patterns stacked apart from each other.

The second electrode part includes a pair of electrode patterns stacked apart from each other.

The second terminal unit includes a pair of terminal patterns spaced apart from each other to operate as input terminals or output terminals.

In order to achieve the above object, a varistor module according to another embodiment of the present invention includes a first terminal unit which operates at least one of an input terminal and an output terminal; A first device protection part stacked on the first terminal part; A first electrode part stacked on the first device protection part; A varistor unit stacked on the first electrode unit; A second electrode part stacked on the varistor part; A second device protection part stacked on the second electrode part; And a second terminal unit stacked on the second element protection unit and operating at least one of an input terminal and an output terminal.

The first terminal unit includes a pair of terminal patterns spaced apart from each other to operate as an input terminal or an output terminal.

The first device protection unit is composed of a PCT thermistor or an NTC thermistor.

The second terminal unit includes a pair of terminal patterns spaced apart from each other to operate as input terminals or output terminals.

The varistor module according to the present invention is formed by stacking a terminal part, a varistor part, an electrode part, and an element protection part so that the element protection part is positioned at the front end of the varistor regardless of the position of the input terminal and the output terminal, thereby realizing a varistor module having no directivity. This has a possible effect.

In addition, since the varistor module has an element protection part located at the front end of the varistor element regardless of the positions of the input terminal and the output terminal, when the temperature of the varistor module rises, the varistor module reduces the current supply to the varistor element and causes damage due to overheating of the varistor module ( That is, there is an effect that can prevent explosion).

In addition, the varistor module is formed by arranging PTC on the upper part of the varistor and laminating NTC on the lower part, thereby preventing damage to the varistor module due to overcurrent such as an inverted current and a noise surge current.

1 and 2 are views for explaining a varistor module according to a first embodiment of the present invention.
3 is a view for explaining an equivalent circuit of the varistor module according to the first embodiment of the present invention.
4 is a view for explaining an application example of the varistor module according to the first embodiment of the present invention.
5 and 6 are views for explaining the varistor module according to a second embodiment of the present invention.
7 is a view for explaining an equivalent circuit of the varistor module according to a second embodiment of the present invention.
8 and 9 are views for explaining the varistor module according to a third embodiment of the present invention.
10 is a view for explaining an equivalent circuit of the varistor module according to a third embodiment of the present invention.
11 is a view for explaining an application example of the varistor module according to a third embodiment of the present invention.
12 and 13 are views for explaining the varistor module according to a fourth embodiment of the present invention.
14 is a view for explaining an equivalent circuit of the varistor module according to a fourth embodiment of the present invention.
15 is a view for explaining an application example of the varistor module according to a third 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. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

(Embodiment 1)

Hereinafter, the varistor module according to the first embodiment of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2 are diagrams for explaining a varistor module according to a first embodiment of the present invention. 3 is a view for explaining an equivalent circuit of the varistor module according to the first embodiment of the present invention, Figure 4 is a view for explaining an application example of the varistor module according to the first embodiment of the present invention.

As shown in FIG. 1, the varistor module 100 includes a terminal unit 110, a varistor unit 120, an electrode unit 130, and an element protection unit 140. At this time, as shown in Figure 2, the varistor module 100, the terminal portion 110 is located at the bottom end, the varistor portion 120, the electrode portion 130, the element protection unit 140 on the upper surface of the terminal portion 110 ) Are sequentially stacked and formed.

The terminal unit 110 operates as an input terminal and an output terminal of the varistor module 100. That is, the terminal unit 110 operates as an input terminal and an output terminal of the varistor unit 120 to be described later. To this end, the terminal unit 110 includes a pair of terminal patterns spaced apart from each other to operate as an input terminal and an output terminal. That is, the terminal unit 110 includes a first terminal pattern 110a that operates as an input terminal or an output terminal, and a second terminal pattern 110b that operates as an input terminal or an output terminal. For example, when the first terminal pattern 110a operates as an input terminal, the second terminal pattern 110b operates as an output terminal. Of course, the first terminal pattern 110a may operate as an output terminal, and the second terminal pattern 110b may operate as an input terminal.

The varistor unit 120 is stacked on the terminal unit 110. That is, the varistor unit 120 is composed of a varistor element and stacked on the upper surface of the pair of terminal patterns.

The electrode unit 130 is stacked on the upper surface of the varistor unit 120. In this case, the electrode unit 130 includes a pair of electrode patterns 130a and 130b spaced apart from each other on the upper surface of the varistor unit 120.

The device protection part 140 is stacked on the electrode part 130. At this time, the device protection unit 140 is made of a PTC (Positive Temperature Ccefficient) thermistor element (hereinafter referred to as PTC) whose resistance value increases when the temperature rises in order to prevent damage to the varistor element due to overheating.

As shown in FIG. 3, the varistor module 100 has a terminal unit 110 formed of a pair of terminal patterns 110a and 110b at a lowermost end thereof. In this case, the pair of terminal patterns 110a and 110b operate as input terminals or output terminals.

The varistor module 100 is formed by sequentially stacking the varistor unit 120, the electrode unit 130, and the element protection unit 140 on the upper surface of the terminal unit 110. In this case, the device protection unit 140 is made of PTC and is stacked on the electrode 130 so that the device protection unit 140 is positioned at the front end of the varistor unit 120 regardless of the position of the input terminal and the output terminal on the equivalent circuit. Accordingly, it is possible to implement the varistor module 100 having no directivity.

When the temperature of the varistor unit 120 increases, the device protection unit 140 increases the resistance value. When the resistance of the device protection unit 140 increases, the amount of current delivered to the varistor unit 120 decreases to block the heat generation factor in the varistor unit 120. Therefore, the device protection unit 140 reduces the load of the varistor unit 120 to eliminate the possibility of ignition.

The varistor module 100 according to the first exemplary embodiment of the present invention is a surface mount device (SMD) varistor module 100, and as shown in FIG. 3, an input circuit of an automotive electronic tester (ETACS UNIT) ( More specifically, it is disposed at the microcomputer shear).

As described above, in the varistor module 100 according to the first embodiment of the present invention, the terminal unit 110 is positioned at the lowermost end, and the varistor unit 120, the electrode unit 130, and the element are disposed on the upper surface of the terminal unit 110. By sequentially stacking the protection parts 140, the device protection part 140 is positioned at the front end of the varistor regardless of the position of the input terminal and the output terminal, thereby enabling the implementation of the varistor module 100 having no direction. There is.

In addition, in the varistor module 100 according to the first embodiment of the present invention, the element protection unit 140 is positioned at the front end of the varistor element regardless of the position of the input terminal and the output terminal, so that the temperature of the varistor module 100 is maintained. When is increased, the current supply to the varistor element is reduced to prevent damage (i.e. explosion-proof) due to overheating of the varistor module 100, and overcurrent is transmitted to the varistor module, thereby preventing the module from being damaged. .

(Second Embodiment)

Hereinafter, the varistor module according to the second embodiment of the present invention will be described in detail with reference to the accompanying drawings. 5 and 6 are views for explaining a varistor module according to a second embodiment of the present invention, Figure 7 is a view for explaining an equivalent circuit of the varistor module according to a second embodiment of the present invention.

As shown in FIG. 5, the varistor module 200 includes a first terminal unit 210, a first varistor unit 220, a first electrode unit 230, an element protection unit 240, and a second electrode unit 250. ), A second varistor unit 260, and a second terminal unit 270. In this case, as shown in FIG. 6, in the varistor module 200, a first terminal unit 210 is disposed at a lowermost end thereof, and the first varistor unit 220, the first electrode unit 230, and the device protection unit 240 are provided. The second electrode part 250, the second varistor part 260, and the second terminal part 270 are sequentially stacked.

The first terminal unit 210 operates at least one of an input terminal, an output terminal, and a ground terminal. The first terminal unit 210 operates as one of an input terminal and an output terminal of the first varistor unit 220 and the second varistor unit 260, which will be described later, and the ground terminal. To this end, the first terminal portion 210 is composed of a pair of terminal patterns (210a, 210b) formed to be spaced apart from each other. That is, the first terminal unit 210 is formed to be spaced apart from the first terminal pattern 210a operating as an input terminal or an output terminal, and the second terminal pattern 210b operating as a ground terminal. It is configured to include. Of course, the first terminal portion 210 is formed to be spaced apart from the first terminal pattern 210a that operates as a ground terminal and the first terminal pattern 210a to operate as an input terminal or an output terminal 210b. It may be configured to include.

The first varistor unit 220 is formed of a varistor element and stacked on top of the first terminal unit 210.

The first electrode unit 230 is stacked on the first varistor unit 220. In this case, the first electrode unit 230 includes a pair of electrode patterns 230a and 230b which are stacked on the upper surface of the first varistor unit 220 and spaced apart from each other.

The device protection part 240 is stacked on the first electrode part 230. At this time, the element protection unit 240 is made of a PTC that increases the resistance value when the temperature rises in order to prevent damage to the first varistor unit 220 and the second varistor unit 260 to be described later due to overheating.

The second electrode part 250 is stacked on the device protection part 240. In this case, the second electrode part 250 includes a pair of electrode patterns 250a and 250b which are stacked on the upper surface of the device protection part 240 so as to be spaced apart from each other.

The second varistor unit 260 is formed of a varistor element and stacked on the second electrode unit 250.

The second terminal unit 270 is stacked on the second varistor unit 260 to operate at least one of the input terminal and the output terminal. The second terminal unit 270 includes a pair of terminal patterns 270a and 270b spaced apart from each other to operate as input terminals or output terminals. That is, the second terminal unit 270 operates as an input terminal and an output terminal of the first varistor unit 220 and the second varistor unit 260 described above. To this end, the second terminal portion 270 is composed of a pair of terminal patterns 270a and 270b spaced apart from each other. That is, the second terminal unit 270 is formed to be spaced apart from the third terminal pattern 270a operating as an input terminal or an output terminal, and the fourth terminal pattern 270b operating as an input terminal. It is configured to include. Of course, the second terminal unit 270 may operate as the third terminal pattern 270a as the input terminal, and the fourth terminal pattern 270b as the output terminal. In the second terminal unit 270, both the third terminal pattern 270a and the fourth terminal pattern 270b may operate as input terminals or may operate as output terminals.

The varistor module 200 according to the second embodiment of the present invention is a surface mount device (SMD) varistor, and as illustrated in FIG. 7, an AC / DC single phase circuit (FIG. 7A) or AC / An AC / DC conversion circuit composed of a DC three-phase circuit (FIG. 7B) is disposed in front of the device to be protected for protection of an AC line.

As described above, in the varistor module 200 according to the second embodiment of the present invention, the first terminal portion 210 is disposed at the lowermost portion, and the first varistor portion 220, the first electrode portion 230, and device protection are provided. The unit 240, the second electrode unit 250, the second varistor unit 260, and the second terminal unit 270 are sequentially stacked to form an element at the front end of the varistor regardless of the position of the input terminal and the output terminal. Since the protection unit 240 is located, the varistor module 200 having no directivity may be implemented.

In addition, in the varistor module 200 according to the second embodiment of the present invention, the element protection unit 240 is positioned at the front end of the varistor element regardless of the position of the input terminal and the output terminal, so that the temperature of the varistor module 200 is increased. When is increased, the current supply to the varistor element is reduced to prevent damage (ie, explosion) due to overheating of the varistor module 200, and the overcurrent is transmitted to the varistor module 200 to prevent the module from being damaged. It works.

(Third Embodiment)

Hereinafter, a varistor module according to a third embodiment of the present invention will be described in detail with reference to the accompanying drawings. 8 and 9 illustrate a varistor module according to a third embodiment of the present invention. 10 is a view for explaining an equivalent circuit of the varistor module according to a third embodiment of the present invention, Figure 11 is a view for explaining an application example of the varistor module according to a third embodiment of the present invention.

As shown in FIG. 8, the varistor module 300 includes a first terminal part 310, a first device protection part 320, a first electrode part 330, a varistor part 340, and a second electrode part 350. ), A second device protection unit 360, and a second terminal unit 370. In this case, as shown in FIG. 9, in the varistor module 300, the first terminal part 310 is disposed at the lowermost end, and the first device protection part 320, the first electrode part 330, and the varistor part 340 are disposed. The second electrode part 350, the second device protection part 360, and the second terminal part 370 are sequentially stacked.

The first terminal unit 310 operates at least one of an input terminal and an output terminal. That is, the first terminal unit 310 operates as an input terminal and an output terminal of the varistor unit 340 which will be described later. To this end, the first terminal unit 310 includes a pair of terminal patterns 310a and 310b spaced apart from each other to operate as an input terminal and an output terminal. That is, the first terminal unit 310 includes a first terminal pattern 310a that operates as an input terminal or an output terminal, and a second terminal pattern 310b that operates as an input terminal or an output terminal. For example, when the first terminal pattern 310a operates as an input terminal, the second terminal pattern 310b operates as an output terminal. Of course, the first terminal pattern 310a may operate as an output terminal, and the second terminal pattern 310b may operate as an input terminal. In the first terminal unit 310, both the first terminal pattern 310a and the second terminal pattern 310b may operate as input terminals or may operate as output terminals.

The first device protection part 320 is stacked on the first terminal part 310. At this time, the first element protection unit 320 is made of a PTC which increases the resistance value when the temperature rises in order to prevent damage to the varistor element due to overheating.

The first electrode part 330 is stacked on the first device protection part 320. In this case, the first electrode part 330 is formed of one electrode pattern and stacked on the first device protection part 320.

The varistor part 340 is stacked on the first electrode part 330. That is, the varistor part 340 is formed of a varistor element and stacked on the upper surface of the electrode pattern of the first electrode part 330.

The second electrode unit 350 is stacked on the varistor unit 340. In this case, the second electrode part 350 is formed of one electrode pattern and stacked on the varistor part 340.

The second device protection part 360 is stacked on the second electrode part 350. At this time, the second element protection unit 360 is made of a PTC that increases the resistance value when the temperature rises to prevent damage to the varistor element due to overheating.

The second terminal unit 370 is stacked on the second device protection unit 360 to operate at least one of the input terminal and the output terminal. That is, the first terminal unit 310 operates as an input terminal and an output terminal of the varistor unit 340 described above. To this end, the second terminal unit 370 includes a pair of terminal patterns 370a and 370b spaced apart from each other to operate as input terminals and output terminals. That is, the second terminal unit 370 includes a third terminal pattern 370a that operates as an input terminal or an output terminal, and a fourth terminal pattern 370b that operates as an input terminal or an output terminal. For example, when the third terminal pattern 370a operates as an input terminal, the fourth terminal pattern 370b operates as an output terminal. Of course, the third terminal pattern 370a may operate as an output terminal, and the fourth terminal pattern 370b may operate as an input terminal. In the second terminal unit 370, both the third terminal pattern 370a and the fourth terminal pattern 370b may operate as input terminals or may operate as output terminals.

As shown in FIG. 10, referring to an equivalent circuit of the varistor module 300 according to the third embodiment of the present invention, the varistor unit 340 is disposed at the center of the varistor module 340 and the first terminals are provided at both terminals of the varistor unit 340. The device protection unit 320 and the second device protection unit 360 are connected to each other. In this case, the first device protection unit 320 is connected to the first terminal pattern 310a and the second terminal pattern 310b. The second device protection unit 360 is connected to the third terminal pattern 370c and the fourth terminal pattern 370b. At this time, the first device protection unit 320 and the second device protection unit 360 is made of PTC and positioned in front of the varistor unit 340 regardless of the position of the input terminal and the output terminal on the equivalent circuit. Accordingly, it is possible to implement the varistor module 300 having no directivity.

In addition, when the temperature of the varistor 340 increases, the first device protection unit 320 increases in resistance. When the resistance of the first device protection unit 320 increases, the amount of current transferred from the first terminal unit 310 to the varistor unit 340 is reduced to block the heat generation factor in the varistor unit 340. When the resistance value of the second device protection unit 360 increases, the amount of current transferred from the second terminal unit 370 to the varistor unit 340 is reduced to block the heat generation factor in the varistor unit 340. Accordingly, the first device protection unit 320 and the second device protection unit 360 reduce the load of the varistor unit 340 to eliminate the possibility of ignition.

The varistor module 300 according to the third embodiment of the present invention is a lead type varistor module 300, and is used in a circuit embedded in an automobile, as shown in FIG. 11.

As described above, the varistor module 300 according to the third embodiment of the present invention forms the upper and lower surface element protection parts of the varistor part 340, so that the front end of the varistor regardless of the position of the input terminal and the output terminal. Since the element protection unit is located at, there is an effect that the implementation of the varistor module 300 having no directivity is possible.

In addition, the varistor module 300 has an element protection unit located at the front end of the varistor element regardless of the position of the input terminal and the output terminal, so that when the temperature of the varistor module 300 rises, the varistor module reduces the current supply to the varistor element. Prevention of damage (ie, explosion-proof) due to overheating of the 300 and overcurrent is transmitted to the varistor module 300 has an effect that can prevent the module from being damaged.

(Fourth Embodiment)

Hereinafter, a varistor module according to a fourth embodiment of the present invention will be described in detail with reference to the accompanying drawings. 12 and 13 illustrate a varistor module according to a fourth embodiment of the present invention. 14 is a view for explaining an equivalent circuit of the varistor module according to a fourth embodiment of the present invention, Figure 15 is a view for explaining an application example of the varistor module according to a third embodiment of the present invention.

As shown in FIG. 12, the varistor module includes a first terminal part, a first device protection part, a first electrode part, a varistor part, a second electrode part, a second device protection part, and a second terminal part. In this case, as shown in FIG. 13, the varistor module includes a first terminal portion disposed at a lowermost end thereof, and includes a first device protection unit, a first electrode unit, a varistor unit, a second electrode unit, a second device protection unit, and a second terminal unit. Are sequentially stacked and formed.

The first terminal unit 410 operates at least one of an input terminal and an output terminal. That is, the first terminal unit 410 operates as an input terminal and an output terminal of the varistor unit 440 which will be described later. To this end, the first terminal unit 410 includes a pair of terminal patterns 410a and 310b spaced apart from each other to operate as an input terminal and an output terminal. That is, the first terminal unit 410 includes a first terminal pattern 410a that operates as an input terminal or an output terminal, and a second terminal pattern 410b that operates as an input terminal or an output terminal. For example, when the first terminal pattern 410a operates as an input terminal, the second terminal pattern 410b operates as an output terminal. Of course, the first terminal pattern 410a may operate as an output terminal, and the second terminal pattern 410b may operate as an input terminal. In the first terminal unit 410, both the first terminal pattern 410a and the second terminal pattern 410b may operate as input terminals or may operate as output terminals.

The first device protection part 420 is stacked on the first terminal part 410. At this time, the first element protection unit 420 is made of NTC that the resistance value decreases when the temperature rises to prevent damage to the varistor element due to overcurrent. Here, the varistor module according to the fourth embodiment of the present invention is different from the varistor module 300 according to the third embodiment in that the first element protection unit is made of a NTC (Thermal Sensitive Resistor) element (hereinafter, NTC). That is, the resistance of the first device protection unit 420 decreases when the temperature of the varistor 440 increases. When the resistance of the first device protection unit 420 decreases, the amount of current transferred from the first terminal unit 410 to the varistor unit 440 is reduced. Therefore, it is possible to reduce damage of the varistor module 400 by reducing overcurrent (ie, inverted current, noise surge current, etc.) generated by a load dump of a vehicle, a quick start, and the like. Can be.

The first electrode part 430 is stacked on the first device protection part 420. In this case, the first electrode part 430 is formed of one electrode pattern and stacked on the first device protection part 420.

The varistor unit 440 is stacked on the first electrode unit 430. That is, the varistor unit 440 is formed of a varistor element and stacked on the upper surface of the electrode pattern of the first electrode unit 430.

The second electrode part 450 is stacked on the varistor part 440. In this case, the second electrode part 450 is formed of one electrode pattern and is stacked on the varistor part 440.

The second device protection part 460 is stacked on the second electrode part 450. At this time, the second element protection unit 460 is made of a PTC that increases the resistance value when the temperature rises to prevent damage to the varistor element due to overheating.

The second terminal unit 470 is stacked on the second device protection unit 460 to operate at least one of the input terminal and the output terminal. That is, the first terminal unit 410 operates as an input terminal and an output terminal of the varistor unit 440 described above. To this end, the second terminal unit 470 includes a pair of terminal patterns 470a and 370b spaced apart from each other to operate as input terminals and output terminals. That is, the second terminal unit 470 includes a third terminal pattern 470a that operates as an input terminal or an output terminal, and a fourth terminal pattern 470b that operates as an input terminal or an output terminal. For example, when the third terminal pattern 470a operates as an input terminal, the fourth terminal pattern 470b operates as an output terminal. Of course, the third terminal pattern 470a may operate as an output terminal, and the fourth terminal pattern 470b may operate as an input terminal. In the second terminal unit 470, both the third terminal pattern 470a and the fourth terminal pattern 470b may operate as input terminals or may operate as output terminals.

As shown in FIG. 14, referring to an equivalent circuit of the varistor module 400 according to the fourth embodiment of the present invention, a varistor part 440 is disposed at the center of the varistor module 400, and a first terminal is provided at both terminals of the varistor part 440. The device protection unit 420 and the second device protection unit 460 are connected to each other. In this case, the first device protection unit 420 is connected to the first terminal pattern 410a and the second terminal pattern 410b. The second device protection unit 460 is connected to the third terminal pattern 470c and the fourth terminal pattern 470b. At this time, the first device protection unit 420 is made of NTC and the second device protection unit 460 is made of PTC. In this case, when the temperature of the varistor unit 440 increases, the first element protection unit 420 decreases the resistance value. When the resistance of the first device protection unit 420 decreases, the overcurrent transmitted from the first terminal unit 410 to the varistor unit 440 is reduced. Accordingly, the first device protection unit 420 prevents overcurrent from flowing into the varistor unit 440 to prevent damage to the varistor module 400 due to the overcurrent.

Such a varistor module 400 according to the fourth embodiment of the present invention is a lead type varistor module 400 and is used in a circuit embedded in an automobile, as shown in FIG. 15.

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, 200, 300, 400: varistor module
110: terminal portion 120: varistor portion
130: electrode portion 140: element protection portion
210: first terminal portion 220: first varistor portion
230: first electrode portion 240: element protection unit
250: second electrode portion 260: second varistor portion
270: second terminal portion 310, 410: first terminal portion
320, 420: first device protection part 330, 430: first electrode part
340 and 440: varistor portions 350 and 450: second electrode portions
360, 460: second element protection part 370, 470: second terminal part

Claims (13)

A terminal unit operating as an input terminal and an output terminal;
A varistor part stacked on the terminal part;
An electrode part stacked on an upper surface of the varistor part; And
Varistor module comprising a device protection unit stacked on the electrode portion. The method according to claim 1,
The terminal unit includes a pair of terminal patterns spaced apart from each other to operate as an input terminal and an output terminal. The method according to claim 1,
And the electrode part comprises a pair of electrode patterns stacked on the upper surface of the varistor part and spaced apart from each other. The method according to claim 1,
And the device protection unit is formed of a PTC thermistor. A first terminal unit operating at least one of an input terminal, an output terminal, and a ground terminal;
A first varistor unit stacked on the first terminal unit;
A first electrode part stacked on the first varistor part;
An element protection unit stacked on the first electrode unit;
A second electrode part stacked on the device protection part;
A second varistor unit stacked on the second electrode unit; And
And a second terminal unit stacked on the second varistor unit and operating as at least one of an input terminal and an output terminal. The method according to claim 5,
The first terminal portion,
A first terminal pattern operating as an input terminal or an output terminal; And
And a second terminal pattern formed to be spaced apart from the first terminal pattern to operate as a ground terminal. The method according to claim 5,
And the first electrode part comprises a pair of electrode patterns stacked apart from each other. The method according to claim 5,
And the second electrode unit comprises a pair of electrode patterns stacked apart from each other. The method according to claim 5,
And the second terminal unit includes a pair of terminal patterns spaced apart from each other to operate as input terminals or output terminals. A first terminal unit operating at least one of an input terminal and an output terminal;
A first device protection part stacked on the first terminal part;
A first electrode part stacked on the first device protection part;
A varistor unit stacked on the first electrode unit;
A second electrode part stacked on the varistor part;
A second device protection part stacked on the second electrode part; And
And a second terminal part stacked on the second device protection part and operating at least one of an input terminal and an output terminal. The method of claim 10,
And the first terminal unit includes a pair of terminal patterns spaced apart from each other to operate as input terminals or output terminals. The method of claim 10,
The first device protection unit is a varistor module, characterized in that consisting of a PCT thermistor or NTC thermistor. The method of claim 10,
And the second terminal unit includes a pair of terminal patterns spaced apart from each other to operate as input terminals or output terminals.

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