Small size portable filter connector with overvoltage protection function

Abstract

The utility model discloses a small volume convenient dress formula filter connector with overvoltage protection function, including shell, contact piece, plate type capacitor and array type piezo -resistor, plate type capacitor with array type piezo -resistor overlap and place in the shell, a plurality of contact piece respectively pass through a plurality of through -hole shape inner electrode of plate type capacitor and a plurality of through -hole shape inner electrode of array type piezo -resistor, the outer electrode of plate type capacitor with the outer electrode of array type piezo -resistor respectively with the inner wall electric connection of shell. The utility model discloses a array type piezo -resistor replaces traditional TVS diode and realizes the function of overvoltage protection, and effectively integrates with plate type capacitor in a shell, significantly reduces the component, improves the integration, is favorable to the miniaturization and light weight development of product, and the welding position and the welding spot significantly reduce, and the assembly is simple and quick, improves the assembly efficiency and product reliability.

Description

Technical Field

[0001] This utility model relates to a filter connector, and more particularly to a small-volume portable filter connector with overvoltage protection function. Background Technology

[0002] As electronic products become increasingly miniaturized, thinner, more integrated, and more multifunctional, system integration is becoming increasingly sophisticated. When a system is subjected to electrostatic discharge or lightning strikes, a very high instantaneous voltage is generated, which can easily damage components within the system and affect its normal operation. Components such as gas discharge tubes, TVS diodes, and varistors are typically used to protect downstream components in the system. These are primarily used in automotive electronics, communications, computers, consumer electronics, and military electronic products, and are suitable for overvoltage protection in these applications.

[0003] For precision electronic equipment, not only is overvoltage protection necessary, but products also need to meet electromagnetic compatibility (EMC) requirements. Capacitors are typically used to filter input and output cables. For the overall product, filtering components are often added to the interface to suppress interference signals from entering the system. Currently, filtered connectors (also known as filtered electrical connectors) are commonly used to achieve EMC protection at the interface. The principle behind this is the capacitor's "DC blocking and AC passing" principle; interference signals are grounded through the connector's metal casing, thus preventing interference to downstream electronic components.

[0004] To improve integration and reduce size for easier application, traditional filter connectors typically use plate capacitors for filtering. Multiple contacts pass through multiple through-hole-shaped internal electrodes (with metal layers forming the internal electrodes) of the plate capacitor. The external electrodes (with metal layers forming the external electrodes) at the edge of the plate capacitor are electrically connected to the inner wall of the connector housing to achieve filtering. To enhance overvoltage protection, traditional filter connectors incorporate TVS diodes (transient voltage suppressor diodes) to form filter connectors with overvoltage protection.

[0005] like Figure 1As shown, a traditional filter connector with overvoltage protection includes a first housing 10, a second housing 7, a cover plate 2, contacts 3, a plate capacitor 9, a circuit board 5, and a TVS diode 4. The plate capacitor 9 is installed inside the first housing 10 via an insulator 8 and fixed with epoxy resin 6. The circuit board 5 and the TVS diode 4 are installed inside the second housing 7 and sealed by the cover plate 2. The first housing 10 and the second housing 7 are interconnected. Multiple contacts 3 pass through multiple through-hole-shaped internal electrodes of the plate capacitor 9 and multiple through-holes on the circuit board 5, and are correspondingly connected to the TVS diode 4. One end of each contact 3 passes through multiple through-holes on the cover plate 2. In application, both ends of the multiple contacts 3 are connected to multiple wires 1, which can be power lines or signal lines. The multiple wires 1 generally include power lines and signal lines. Noise signals on the wires 1 are filtered by grounding through the plate capacitor 9 and the first housing 10. Overvoltage signals on the wires 1 are discharged by the TVS diode 4 to achieve overvoltage protection.

[0006] The aforementioned traditional filter connector with overvoltage protection function has the following drawbacks: it requires two housings to install the plate capacitor 9 and TVS diode 4 respectively, resulting in a large product size, which is not conducive to miniaturization; it has many components, making the overall product heavy, which is not conducive to lightweight development; and it is time-consuming and labor-intensive to assemble, resulting in a long production cycle; the TVS diode 4 is soldered on the printed circuit board 5, and the printed circuit board 5 is also connected to the contact 3 by soldering, which is time-consuming and labor-intensive, with many solder joints, increasing the processing difficulty and reducing product reliability. Utility Model Content

[0007] The purpose of this invention is to provide a small-volume portable filter connector with overvoltage protection that has fewer components, a smaller size, is easy to assemble, and solves the above-mentioned problems.

[0008] This utility model achieves the above objectives through the following technical solutions: A small-volume portable filter connector with overvoltage protection includes a housing, contacts, and a plate capacitor, as well as an array of varistors. The plate capacitor and the array of varistors are stacked inside the housing. Multiple contacts pass through multiple through-hole-shaped inner electrodes of the plate capacitor and the array of varistors, respectively. The outer electrodes of the plate capacitor and the array of varistors are electrically connected to the inner wall of the housing.

[0009] The aforementioned array-type varistor is also a type of plate resistor. Its main body is a plate-shaped ceramic substrate, primarily composed of zinc oxide and doped with various metal oxides. The surface is coated with glass glaze. The ceramic substrate has multiple through-hole-shaped internal electrodes (with metal layers forming the internal electrodes on the hole walls). The outer wall of the ceramic substrate has metal layers forming the external electrodes. Its working principle is as follows: when an overvoltage occurs in the circuit, the nonlinearity of the varistor causes its internal resistance to drop sharply and it to conduct rapidly. Its operating current increases by several orders of magnitude. At this time, the voltage of the varistor will be immediately clamped to a fixed value, thereby protecting the downstream circuit.

[0010] Preferably, in order to improve the contact reliability between the contact and the plate capacitor and the array varistor, claw springs are respectively provided between the contact and the corresponding through-hole inner electrode of the plate capacitor, and between the contact and the corresponding through-hole inner electrode of the array varistor.

[0011] Preferably, in order to achieve the functions of moisture protection, shock absorption and fixation, a silicone rubber layer and an epoxy resin are respectively provided on the outer side of the plate capacitor away from the array varistor and on the outer side of the array varistor away from the plate capacitor.

[0012] Preferably, in order to improve the conductivity between the plate capacitor and the array varistor and the housing, conductive adhesive is provided between the outer electrode of the plate capacitor and the inner wall of the housing, and between the outer electrode of the array varistor and the inner wall of the housing.

[0013] The beneficial effects of this utility model are as follows: This invention achieves overvoltage protection by using an array-type varistor instead of a traditional TVS diode, and effectively integrates it with a plate capacitor in a single housing. This significantly reduces the number of components, increases integration, and facilitates product miniaturization and weight reduction. The number of welding parts and solder joints is significantly reduced, making assembly simple and quick, and improving assembly efficiency and product reliability. Attached Figure Description

[0014] Figure 1 This is a front cross-sectional view of a traditional filter connector with overvoltage protection. Figure 2 This is a schematic diagram of the main cross-sectional structure of the small-volume portable filter connector with overvoltage protection function described in this utility model; Figure 3 This is a three-dimensional structural diagram of the assembled plate capacitor, array varistor, and contacts of the small-volume portable filter connector with overvoltage protection function described in this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings: like Figure 2 and Figure 3 As shown, the small-volume portable filter connector with overvoltage protection function of this utility model includes a housing 15, contacts 3 (in the figure, solder cup type pins), a plate capacitor 8, and an array varistor 14. The plate capacitor 8 and the array varistor 14 are stacked inside the housing 15. Multiple contacts 3 pass through multiple through-hole type inner electrodes of the plate capacitor 8 and multiple through-hole type inner electrodes of the array varistor 14, respectively. The outer electrodes of the plate capacitor 8 and the outer electrodes of the array varistor 14 are electrically connected to the inner wall of the housing 15, respectively.

[0016] Preferably, to improve the contact reliability between the contact 3 and the plate capacitor 8 and the array varistor 14, claw springs 13 are provided between the contact 3 and the corresponding through-hole inner electrode of the plate capacitor 8, and between the contact 3 and the corresponding through-hole inner electrode of the array varistor 14. To achieve the functions of moisture protection, shock absorption and fixation, a silicone rubber layer 11 and an epoxy resin 6 are sequentially provided on the side of the plate capacitor 8 away from the array varistor 14 and on the side of the array varistor 14 away from the plate capacitor 8. To improve the conductivity between the plate capacitor 8 and the array varistor 14 and the outer shell 15, conductive adhesive 12 is provided between the outer electrode of the plate capacitor 8 and the inner wall of the outer shell 15, and between the outer electrode of the array varistor 14 and the inner wall of the outer shell 15.

[0017] Figure 2 The image also shows a sealing element 17 and a sealing ring 16 located within the housing 15, which are conventional adaptive structures.

[0018] like Figure 2 and Figure 3 As shown, in application, the two ends of multiple contacts 3 are connected to multiple wires 1 respectively. The wires 1 can be power lines or signal lines. The multiple wires 1 generally include power lines and signal lines. The noise signal on the wires 1 is filtered by grounding through the plate capacitor 9 and the housing 15. The overvoltage signal on the wires 1 is discharged by grounding through the array varistor 14 and the housing 15 to achieve the overvoltage protection function. Finally, the functions of filtering noise on the wires and overvoltage protection for the downstream circuit are realized simultaneously.

[0019] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A compact, portable filter connector with overvoltage protection, comprising a housing, contacts, and a plate capacitor, characterized in that: It also includes an array-type varistor, wherein the plate capacitor and the array-type varistor are stacked inside the housing, and multiple contacts pass through multiple through-hole-shaped inner electrodes of the plate capacitor and the array-type varistor, respectively. The outer electrodes of the plate capacitor and the outer electrodes of the array-type varistor are electrically connected to the inner wall of the housing.

2. The compact, portable filter connector with overvoltage protection function according to claim 1, characterized in that: Claw springs are provided between the contact and the corresponding through-hole inner electrode of the plate capacitor, and between the contact and the corresponding through-hole inner electrode of the array varistor.

3. The compact, portable filter connector with overvoltage protection function according to claim 1 or 2, characterized in that: A silicone rubber layer and an epoxy resin layer are respectively provided on the outer side of the plate capacitor away from the array varistor and on the outer side of the array varistor away from the plate capacitor.

4. The compact, portable filter connector with overvoltage protection function according to claim 1 or 2, characterized in that: Conductive adhesive is provided between the outer electrode of the plate capacitor and the inner wall of the housing, and between the outer electrode of the array varistor and the inner wall of the housing.

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