TWI495077B - Multi-channel over-voltage protection device - Google Patents

Description

Multi-turn overvoltage protection component

The present invention relates to an overvoltage protection component that provides electrostatic discharge (ESD) protection. More particularly, the present invention relates to a multi-turn overvoltage protection component.

The integrated circuit accepts the external power supply and the input signal to be processed, and outputs the processed signal. In particular, since the input of the integrated circuit is directly connected to the gate of the input stage switch, it is quite susceptible to damage. When the integrated circuit is soldered to the board by manual clamping or automatic equipment, the susceptible input and output may be damaged by electrostatic discharge. For example, the human body can be charged by static electricity and then discharged to the integrated circuit of the semiconductor element via the input terminal.

The tool of the automatic assembly machine or the test machine may also be charged and then discharged to the integrated circuit of the semiconductor element via the input terminal of the integrated circuit. As semiconductor technology continues to evolve, the line width of semiconductor components has also shrunk, and the need for protection against electrostatic discharge has also emerged. Most of the integrated circuit components are equipped with an ESD protection mechanism to avoid excessive input current, such as configuring a resistive component at the input terminal to limit the input current.

Future electronic products will develop toward a light, thin, short, and small trend, so that electronic products can be more miniaturized. Therefore, if multiple overvoltage or ESD protection components can be integrated into a single component, it can not only meet the demand for miniaturization of electronic products, but also effectively reduce manufacturing costs.

The invention provides a multi-turn type over-voltage protection component, which utilizes a patterning design such as cutting, laser or lithography etching technology to divide a component electrode into a plurality of independent regions to divide a single component into two or two More than one independent area of electrical characteristics. Thereby, the multi-turn overvoltage protection component of the present invention is capable of simultaneously providing overvoltage protection functions of two or more loops.

According to an embodiment of the invention, a multi-turn overvoltage protection component includes an insulating substrate, a plurality of first conductive members, at least one second conductive member, and at least one variable impedance material. A plurality of first conductive members are disposed on one surface of the insulating substrate as an input electrode terminal. The second conductive member is disposed on the surface of the insulating substrate and forms at least one interval from the adjacent first conductive member. The second conductive member serves as a ground electrode terminal. A variable impedance material is formed in the space such that the multi-turn overvoltage protection element has an electrical characteristic that exhibits high resistance at low applied voltage and low resistance at high applied voltage.

The structural design of the multi-turn overvoltage protection component of the present invention can be implemented in the 0603 size or even a smaller size. Therefore, the overvoltage protection component of the present invention can use a single cost of 0603 to create a higher (for example, four) unit selling price, and can also meet the customer's need to reduce the size of the part.

In one embodiment, the variable impedance material of the present invention comprises a highly conductive magnetic powder and an insulating adhesive, wherein the highly conductive magnetic powder reduces the trigger voltage of the element and exhibits a high resistance characteristic at a low applied voltage state and a high applied voltage state. It exhibits low resistance characteristics. The content of the highly conductive magnetic powder may be between 10% and 90% by weight of the variable impedance material. The highly conductive magnetic powder may include a powder of a metal carbonyl (for example, carbonyl iron powder or nickel carbonyl powder) which not only suppresses an overvoltage but also dissipates a transient current. The use of a highly conductive magnetic metal powder of a metal carbonyl metal not only reduces the trigger voltage of the component, but also its high conductive magnetic properties can absorb some of the electromagnetic radiation that causes signal distortion and data errors. The insulating binder may be present in an amount between 10% and 90% by weight of the variable impedance material. The insulating powder may comprise a metal oxide such as alumina or zirconia.

The variable impedance material exhibits a high resistance characteristic in a low applied voltage state, but exhibits a low resistance characteristic in a high applied voltage state. By providing the variable impedance material in the gap of the overvoltage protection component, the overvoltage protection component has a high resistance at a low applied voltage and a low voltage at a high applied voltage. Electrical characteristics of the resistor.

The above and other technical contents, features, and advantages of the present invention will become more apparent and understood from the description of the accompanying claims. The features, advantages and advantages of the present invention are described in more detail below with reference to the accompanying drawings. FIG. 1 and FIG. 2 are the multi-turn overvoltage protection components of the first embodiment of the present invention. schematic diagram. 1 is a top view of the overvoltage protection component, and FIG. 2 is a cross-sectional view taken along line 1-1 of FIG. The overvoltage protection element 10 includes an insulating substrate 11, an electrode structure 12, and a variable impedance material 13. In an embodiment, the insulating substrate 11 may be, for example, a glass fiber reinforced resin (FR4) substrate. The electrode structure 12 is formed on one surface 14 of the insulating substrate 11. The electrode structure 12 includes first conductive members 121 (four in the present embodiment) and second conductive members 122 (two in the present embodiment). The second conductive member 122 forms a space 15 with the adjacent first conductive member 121. In one embodiment, the spacing 15 is less than or equal to 0.1 mm, particularly less than or equal to 0.08 mm, 0.05 mm, or 0.03 mm. A variable impedance material 13 is formed in the space 15 to provide electrical characteristics that exhibit high resistance at low applied voltages and low resistance at high applied voltages. First conductive member 121 is used as the input electrode terminal, and the second conductive member 122 is used as the ground electrode terminal.

In this embodiment, the insulating substrate 11 is approximately rectangular. The first conductive member 121 is formed at four corners of the rectangle, and the second conductive member 122 is formed at a central portion of the two long sides of the rectangle to form an electrode structure 12 including four input electrode ends and two ground electrode ends. . Each of the second conductive members 122 serves as a common ground electrode end of the first conductive members 121 on both sides.

In particular, in order to facilitate the external circuit, in the embodiment, a rectangular bevel is formed at a corner of the rectangle, and a central portion of the long side of the rectangle forms a notch similar to a semicircle.

3 is a top plan view of a multi-turn overvoltage protection device according to a second embodiment of the present invention. The overvoltage protection element 30 includes an insulating substrate 31, an electrode structure 32, and a variable impedance material 33. The insulating substrate 31 is approximately rectangular, and the first conductive member 321 of the electrode structure 32 is formed at four corners of the rectangle and at a central portion of one of the long sides of the rectangle; the second conductive member 322 is formed on the other long side of the rectangle The central portion forms an electrode structure 32 including five input electrode ends and one ground electrode end. The second conductive member 322 includes a plurality of radial extensions 324 that face the first conductive member 321 . The second conductive member 322 forms a space 35 between the adjacent first conductive members 321 , and the variable impedance material 33 is formed at the interval 35 . in. Regarding the side view structure of the spacer 35 and the variable impedance material 33 in this embodiment, it is similar to that shown in FIG. 2 and will not be repeated here.

4 is a top plan view of a multi-turn type overvoltage protection element according to a third embodiment of the present invention. The overvoltage protection element 40 includes an insulating substrate 41, an electrode structure 42, and a variable impedance material 43. The insulating substrate 41 is approximately rectangular, and the first conductive member 421 is formed at two corners of the rectangle and at the central portion of the rectangular long side of the same side. The second conductive member 422 is formed at the other two corners of the rectangle and at the central portion of the other long side of the rectangle to form an electrode structure 42 including three input electrode ends and three ground electrode ends. In this embodiment, the first conductive member 421 and the second conductive member 422 have the same number and are in one-to-one correspondence. Thereby, the potential problem that the common ground electrode terminal may cause mutual interference between circuits can be further avoided.

In an embodiment of the invention, the variable impedance material may comprise a highly conductive magnetic powder and an insulating binder. The content of the highly conductive magnetic powder may be between 10% and 90% by weight of the variable resistance material, preferably from 20% to 86% by weight or particularly from 75.8% to 85% by weight of the variable resistance material. The content of the insulating binder may be between 10% and 90% by weight of the variable impedance material, and the content is preferably between 14% and 80% or particularly between 14% and 18% by weight of the variable resistance material. .

In an embodiment of the invention, the highly conductive magnetic powder comprises a carbonyl group Ligand (Carbonyl Ligand). For example, the highly conductive magnetic powder includes a carbonyl metal powder, and it may contain, for example, Carbonyl Iron, Carbonyl Nickel, Carbonyl Nickel/Cobalt Alloy. Or a mixture thereof. In one embodiment of the invention, the insulating binder comprises an epoxy or silicone.

In another embodiment of the invention, the variable impedance material further comprises a semiconductor powder. The semiconductor powder contains zinc oxide or tantalum carbide. The content of the semiconductor powder may be between 0.001% and 10% by weight of the variable impedance material, in particular between 0.01% and 10%, 0.001% to 8% or 1% to 6.5%.

In still another embodiment of the present invention, the variable impedance material further comprises an insulating powder. The insulating powder comprises a metal oxide which may be, for example, alumina or zirconia. The content of the insulating powder may be between 0.001% and 10% by weight of the variable impedance material, or in particular between 1% and 10%, 0.001% to 8% or 1% to 6%.

In one embodiment, the variable impedance material may comprise a semiconductor powder such as zinc oxide or tantalum carbide, which may be present in an amount between 0.001% and 10%, or especially between 0.01% and 10% by weight of the variable impedance material.

The addition of a metal carbonyl powder (such as carbonyl iron powder or nickel carbonyl powder) to a variable-resistance material not only suppresses overvoltage, but also dissipates transient current. The difference with the traditional electrostatic discharge device is that it is carbonyl. The relatively high conductive magnetic metal powder of the base metal can reduce the trigger voltage of the component. Highly conductive magnetic properties also absorb electromagnetic radiation that can cause signal damage and data loss.

The invention utilizes a single component to fabricate a multi-turn electrode structure by using a patterning technique such as dicing, laser or lithography etching, whereby a single component can provide a plurality of overvoltage protection components, which not only contributes to miniaturization of components. Demand, and can effectively reduce costs. In addition to the above embodiments, those skilled in the art can also fabricate other various electrode structures as needed. Furthermore, the performance of the overvoltage protection component can be further improved by the combination of the specific variable impedance material described above.

The technical and technical features of the present invention have been disclosed as above, and those skilled in the art can still make various substitutions and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the present invention should be construed as being limited by the scope of the appended claims

10, 30, 40‧‧‧Overvoltage protection components

11, 31, 41‧‧‧ insulating substrate

12, 32, 42‧‧‧ electrode structure

13, 33, 43‧‧‧Variable impedance materials

14‧‧‧ surface

15, 35, 45‧‧ ‧ intervals

121, 321, 421‧‧‧ first conductive member

122, 322, 422‧‧‧ second conductive member

1 and 2 are schematic views of an overvoltage protection component of a first embodiment of the present invention.

3 is a schematic diagram of an overvoltage protection component of a second embodiment of the present invention.

Figure 4 is a schematic diagram of an overvoltage protection component of a third embodiment of the present invention Figure.

10‧‧‧Overvoltage protection components

11‧‧‧Insert substrate

12‧‧‧Electrode structure

13‧‧‧Variable impedance material

15‧‧‧ interval

121‧‧‧First conductive member

122‧‧‧Second conductive member

Claims (17)

A multi-turn type over-voltage protection component includes: an insulating substrate; a plurality of first conductive members disposed on a surface of the insulating substrate as an input electrode end; at least one second conductive member disposed on the insulating substrate Forming at least one space between the first conductive member and the adjacent first conductive member, the second conductive member serving as a ground electrode end; and at least one variable impedance material member formed in the space, comprising: a highly conductive magnetic powder, The content is between 10% and 90% by weight of the variable impedance material; and the insulating binder is between 10% and 90% by weight of the variable impedance material; wherein the insulating substrate is Forming a rectangle, the first conductive member is formed at least at four corners of the rectangle, and the second conductive member is formed at a central portion of the two long sides of the rectangle to form four input electrode ends and two ground electrode ends. Electrode structure. The multi-turn overvoltage protection component of claim 1, wherein the interval is less than or equal to 0.1 mm. A multi-type overvoltage protection element according to claim 1, wherein the corner of the rectangle forms an oblique angle, and a central portion of the long side of the rectangle forms a notch. According to claim 3, the multi-turn type overvoltage protection component, wherein the bevel angle It is curved and the notch is semi-circular. The multi-turn overvoltage protection component of claim 1, wherein the first conductive member and the second conductive member have the same number and are in one-to-one correspondence. A multi-type overvoltage protection element according to claim 1, wherein the highly conductive magnetic powder comprises a metal carbonyl powder. A multi-type overvoltage protection element according to claim 1, wherein the highly conductive magnetic powder comprises carbonyl iron powder, nickel carbonyl powder, nickel carbonyl cobalt powder or a mixture thereof. A multi-type overvoltage protection component according to claim 1, wherein the insulating adhesive comprises an epoxy resin or a silicone rubber. The multi-turn overvoltage protection component of claim 1, further comprising a semiconductor powder, and the semiconductor powder is present in an amount between 0.001% and 10% by weight of the variable impedance material. A multi-type overvoltage protection element according to claim 9, wherein the semiconductor powder comprises zinc oxide or tantalum carbide. The multi-type overvoltage protection component of claim 1, further comprising an insulating powder in an amount of between 0.001% and 10% by weight of the variable impedance material. A multi-type overvoltage protection element according to claim 11, wherein the insulating powder is alumina or zirconia. A multi-turn type over-voltage protection component includes: an insulating substrate; a plurality of first conductive members disposed on a surface of the insulating substrate as an input electrode end; at least one second conductive member disposed on the insulating substrate Forming at least one space between the first conductive member and the adjacent first conductive member, the second conductive member serving as a ground electrode end; and at least one variable impedance material member formed in the space, comprising: a highly conductive magnetic powder, The content is between 10% and 90% by weight of the variable impedance material; and the insulating binder is between 10% and 90% by weight of the variable impedance material; wherein the insulating substrate is Rectangular, the first conductive member is formed at least at four corners of the rectangle, and the second conductive member is formed at least at a central portion of a long side of the rectangle; the first conductive member further includes another one formed on the rectangle In the central portion of the long side, an electrode structure including five input electrode ends and one ground electrode end is formed. The multi-turn overvoltage protection component of claim 13, wherein the second electrically conductive member comprises a plurality of radial extensions toward the first electrically conductive member. A multi-turn type over-voltage protection component comprises: an insulating substrate; a plurality of first conductive members disposed on a surface of the insulating substrate as an input electrode end; at least one second conductive member disposed on the surface of the insulating substrate and forming at least one adjacent the adjacent first conductive member The second conductive member serves as a ground electrode end; and at least one variable impedance material member is formed in the space, comprising: a highly conductive magnetic powder, the content of which is 10% of the weight of the variable impedance material to Between 90%; and an insulating binder, the content of which is between 10% and 90% by weight of the variable impedance material; wherein the insulating substrate is rectangular, and the first conductive member is formed on the rectangular 2 a central portion of the long side of the rectangle at the corner and the same side, the second conductive member is formed at the other two corners of the rectangle and at the central portion of the other long side of the rectangle, forming three input electrode ends and Electrode structure of the ground electrode end. The multi-turn type overvoltage protection element according to claim 15, wherein the corner of the rectangle forms an oblique angle, and a central portion of the long side of the rectangle forms a notch. The multi-turn overvoltage protection component of claim 16, wherein the bevel is curved and the recess is semi-circular.