CN223206212U - Three-terminal safety structure - Google Patents
Three-terminal safety structureInfo
- Publication number
- CN223206212U CN223206212U CN202422182316.9U CN202422182316U CN223206212U CN 223206212 U CN223206212 U CN 223206212U CN 202422182316 U CN202422182316 U CN 202422182316U CN 223206212 U CN223206212 U CN 223206212U
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- terminal
- circuit
- safety circuit
- insulating layer
- safety
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Abstract
The utility model provides a three-terminal safety structure, wherein a heating body is arranged at the bottom of a supporting body, an insulating layer is arranged between the heating body and a safety circuit, an inflow terminal, an outflow terminal and a control terminal are arranged at the bottom of the insulating layer, the inflow terminal, the outflow terminal and the control terminal are connected through the safety circuit, the safety circuit is fused in an overcurrent state, the control terminal is connected with the outflow terminal through the heating body to form the control circuit, the heating body heats in an overvoltage state, and the heat penetrates through the insulating layer to fuse the safety circuit. When the circuit is over-current or over-voltage, the safety circuit is fused, and the safety circuit is arranged on one side of the inflow terminal, the outflow terminal and the control terminal, so that sparks generated during fusing can not be dispersed or sputtered to other devices, damage or fire disaster of the other devices can be avoided, the safety performance is improved, and a cover is not required to be arranged, so that occupied space can be reduced, the whole structure is more compact, and meanwhile, the cost is reduced.
Description
Technical Field
The utility model relates to the technical field of circuit protection elements, in particular to a three-terminal safety structure.
Background
The three-terminal safety structure generally comprises three terminals, two of which are used for connecting a circuit and the other terminal is connected with an internal resistance heating element, and a fusible metal is arranged in the internal for fusing in the event of overcurrent or short circuit, and the resistance heating element is used for cutting off the circuit by heating the safety circuit in the event of overvoltage.
In the prior art, the three-terminal safety structure is generally provided with a cover for covering the safety circuit so as to prevent other devices from being damaged or from fire caused by spark divergence and sputtering generated by the safety circuit when the safety circuit is fused when overcurrent occurs, and the cover is arranged so that the occupied space of the whole structure of the three-terminal safety structure is increased and the cost processing is increased.
In the prior art, a bearing substrate of the three-terminal fuse is usually a ceramic substrate, electrodes and fusing metals are arranged on the ceramic substrate, and the bearing substrate has at least the following technical problems that the whole thickness of the three-terminal fuse is thickened due to the characteristics of the ceramic substrate, and the production efficiency is low and the cost is high due to more manufacturing procedures of the technological process.
Disclosure of utility model
The utility model mainly aims to provide the three-terminal safety structure which has the advantages of simple and compact whole structure, high productivity and low cost, and can prevent spark from diverging and sputtering to damage other components and prevent fire disaster during fusing protection, thereby improving the safety performance.
In order to achieve the above purpose, the three-terminal safety structure provided by the utility model comprises a support body, a heating body and a safety circuit;
The heating body is arranged at the bottom of the supporting body, an insulating layer is arranged between the heating body and the safety circuit, and an inflow terminal, an outflow terminal and a control terminal are arranged at the bottom of the insulating layer;
The inflow terminal, the outflow terminal and the control terminal are connected through the safety circuit;
under the overcurrent state, the safety circuit is fused;
the control terminal is connected with the outflow terminal through a heating body to form a control circuit, and the control circuit is used for overvoltage
And in the state, the heating body heats, and the heat penetrates through the insulating layer to fuse the safety circuit.
Optionally, in an embodiment, an inflow pad and an outflow pad are respectively disposed at bottoms of two sides of the insulating layer, the safety circuit is disposed between the inflow terminal and the outflow terminal, and the safety circuit is electrically connected with the inflow terminal and the outflow terminal through the inflow pad and the outflow pad respectively.
Optionally, in an embodiment, a control pad is disposed at the bottom of the insulating layer, the control terminal is electrically connected to the control pad through the heating element, and the control pad is electrically connected to the inflow terminal through the safety circuit.
Optionally, in an embodiment, two ends of the heating element are connected with a heating end pad, the insulating layer is provided with a conductive hole conducting with the heating end pad, one end of the heating element is electrically connected with the control terminal through the conductive hole, and the other end of the heating element is electrically connected with the control pad through the conductive hole.
Optionally, in an embodiment, a longitudinal projection of the heater falls within a longitudinal projection of the safety circuit.
Optionally, in an embodiment, the device further includes a solder mask, the solder mask is disposed at a bottom of the safety circuit, and the solder mask completely covers the safety circuit.
Optionally, in an embodiment, a protection layer is disposed on top of the support body, and the protection layer is used for protecting the support body.
Optionally, in an embodiment, the material of the support body includes at least one of glass fiber, epoxy resin, phenolic resin, polytetrafluoroethylene material, and BT resin material.
Optionally, in an embodiment, a material of the insulating layer is the same as a material of the support body.
Optionally, in an embodiment, the safety circuit is an alloy of one or any combination of tin, lead, copper, silver, zinc, and aluminum.
In the integral structure of the three-terminal safety structure, the bottom of the insulating layer is provided with the inflow terminal, the outflow terminal and the control terminal, the inflow terminal, the outflow terminal and the control terminal are connected through the safety circuit, when the circuit is in overcurrent or overvoltage, the safety circuit is fused, as the safety circuit is arranged on one side of the inflow terminal, the outflow terminal and the control terminal, which are connected with the circuit, the inflow terminal, the outflow terminal and the control terminal are electrically connected with external equipment or components, and the safety circuit is arranged between the external equipment and the supporting body, the spark generated by the safety circuit is isolated by the supporting body during fusing and cannot be dispersed or sputtered to other devices, the other devices can be prevented from being damaged or from being in fire, the safety performance is improved, and the structure does not need to be provided with a cover, so that the occupied space can be reduced, the integral structure is more compact, and the cost is reduced.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to scale, unless expressly stated otherwise.
FIG. 1 is a schematic cross-sectional view of an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of another angle according to an embodiment of the present utility model;
FIG. 3 is an exploded view of one embodiment of the present utility model;
FIG. 4 is a schematic cross-sectional view of a support according to an embodiment of the present utility model;
FIG. 5 is a schematic cross-sectional view of a support with an insulating layer and a heating element added thereto according to an embodiment of the present utility model;
FIG. 6 is a schematic cross-sectional view of an insulating layer after laser drilling according to an embodiment of the present utility model;
FIG. 7 is a schematic cross-sectional view of an embodiment of an electroplated safety circuit with solder mask added thereto;
Fig. 8 is a schematic cross-sectional structure of a protective layer according to an embodiment of the utility model.
Reference numerals are given to the support body 10, the insulating layer 11, the conductive hole 111, the protection circuit 12, the heating element 13, the heating end pad 131, the inflow terminal 14, the outflow terminal 15, the control terminal 16, the inflow pad 17, the outflow pad 18, the control pad 19, the solder resist layer 20, and the protection layer 21.
Detailed Description
In order that the utility model may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "vertical", "horizontal", "left", "right", "inner", "outer" and the like are used in this specification for illustrative purposes only. In the description of the present utility model, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or implicitly indicating the number of technical features indicated. Thus, unless otherwise indicated, features defining "first", "second" may be either explicitly or implicitly
Including one or more of such features, "a plurality" means two or more. The terms "comprises," "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that one or more additional features, integers, steps, operations, elements, components, and/or groups thereof may be present or added.
Furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be either permanently connected, removably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intervening medium, or in communication between two elements. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the particular embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Furthermore, the technical features mentioned in the different embodiments of the utility model described below can be combined with one another as long as no conflict arises between them.
Referring to fig. 1, the present utility model provides a three-terminal safety structure, which comprises a supporting body 10, a heating body 13 and a safety circuit 12, wherein the heating body 13 is arranged at the bottom of the supporting body 10, an insulating layer 11 is arranged between the heating body 13 and the safety circuit 12, an inflow terminal 14, an outflow terminal 15 and a control terminal 16 are arranged at the bottom of the insulating layer 11, the inflow terminal 14, the outflow terminal 15 and the control terminal 16 are connected through the safety circuit 12, the safety circuit 12 is fused in an overcurrent state, the control terminal 16 is connected with the outflow terminal 15 through the heating body 13 to form a control circuit, the heating body 13 heats in an overvoltage state, and the heat penetrates through the insulating layer 11 to fuse the safety circuit 12.
In the whole structure of the three-terminal safety structure, an inflow terminal 14, an outflow terminal 15 and a control terminal 16 are arranged at the bottom of an insulating layer 11, the inflow terminal 14, the outflow terminal 15 and the control terminal 16 are connected through a safety circuit 12, when the circuit is over-current or over-voltage, the safety circuit 12 is fused, as the safety circuit 12 is arranged at one side of the inflow terminal 14, the outflow terminal 15 and the control terminal 16, which is connected with the circuit, sparks generated during fusing can not be dispersed or sputtered to other devices, damage or fire disaster of the other devices can be avoided, the safety performance is improved, and the structure does not need to be provided with a cover, so that occupied space can be reduced, the whole structure is more compact, and meanwhile, the cost is reduced.
Specifically, in one embodiment of the present invention, the bottoms of the two sides of the insulating layer 11 are respectively provided with an inflow pad 17 and an outflow pad 18, the safety circuit 12 is disposed between the inflow terminal 14 and the outflow terminal 15, and the safety circuit 12 is electrically connected with the inflow terminal 14 and the outflow terminal 15 through the inflow pad 17 and the outflow pad 18
And (5) connection.
The safety circuit 12 is electrically connected with the inflow terminal 14 and the outflow terminal 15 through the inflow bonding pad 17 and the outflow bonding pad 18, and the inflow terminal 14 and the outflow terminal 15 are connected in series with an external overcurrent protection circuit, when overcurrent occurs, the current of the safety circuit 12 is rapidly increased, heat is rapidly accumulated along with the continuous increase of the current, the temperature is increased, and when the temperature exceeds a melting point, the safety circuit 12 is fused, the circuit is disconnected, and overcurrent protection is realized.
Referring to fig. 2 and 3, a control pad 19 is provided at the bottom of the insulating layer 11, a control terminal 16 is electrically connected to the control pad 19 through a heating element 13, and the control pad 19 is electrically connected to the inflow terminal 14 through a safety circuit 12.
The control terminal 16 is electrically connected with the control pad 19 through the heating body 13, the inflow terminal 14 and the control terminal 16 are connected in series with an external overvoltage protection circuit, the external overvoltage protection circuit is connected in parallel with the overvoltage protection circuit, a MOSFET is arranged on the overvoltage protection circuit, when the voltage on the overvoltage protection circuit reaches a protection threshold value, the MOSFET can enable the overvoltage protection circuit to be converted into a passage from an open circuit, current can flow through the heating body 13, the heating body 13 generates heat to generate heat, the heat is transmitted to the safety circuit 12 through the insulating layer 11, the safety circuit 12 is quickly heated, the overvoltage protection circuit is fused when the temperature reaches a melting point, and the overvoltage protection circuit is disconnected.
Further, both ends of the heating element 13 are connected with a heating terminal pad 131, the insulating layer 11 is provided with a conductive hole 111 which is conducted with the heating terminal pad 131, one end of the heating element 13 is electrically connected with the control terminal 16 through the conductive hole 111, and the other end of the heating element 13 is electrically connected with the control pad 19 through the conductive hole 111.
The insulating layer 11 is provided with the conductive hole 111, so that the control terminal 16 can be communicated with the heating body 13 through the conductive hole 111 and the heating end pad 131, and the current can be ensured to flow to the heating body 13 through the control terminal 16, and further, the heating body 13 can generate heat stably and reliably in overvoltage.
In one embodiment of the present invention, the longitudinal projection of the heater 13 falls within the longitudinal projection of the safety circuit 12.
The longitudinal projection of the heating element 13 falls within the longitudinal projection of the safety circuit 12, so that the heat generated by the heating element 13 can be effectively transferred to the safety circuit 12, and the safety circuit 12 is fused.
In an embodiment of the present invention, the solder mask layer 20 is further included, the solder mask layer 20 is disposed at the bottom of the safety circuit 12, and the solder mask layer 20 completely covers the safety circuit 12.
The solder mask layer 20 covers the safety circuit 12, and can protect the safety circuit 12 from environmental factors, thereby preventing the safety circuit 12 from corrosion and oxidation, and prolonging the service life and stability of the safety circuit 12.
Further, the solder resist layer 20 is made of solder resist ink, which can form an insulating film on the safety circuit 12, effectively preventing the short circuit problem caused by the solder flowing to the safety circuit 12 during soldering.
In an embodiment of the present invention, a protection layer 21 is disposed on top of the support body 10, and the protection layer 21 is used for protecting the support body 10.
The protective layer 21 can protect the support body 10 from the external environment, such as oxidation, corrosion, etc., to a certain extent, and can prolong the service life of the support body 10.
In an embodiment of the present invention, the material of the support body 10 is made of one or more of glass fiber material, epoxy resin material, phenolic resin material, polytetrafluoroethylene material, and BT resin material.
The support body 10 may be a general resin substrate and an organic substrate which are made of glass fiber material, epoxy resin material, phenolic resin material, polytetrafluoroethylene material, BT resin material, etc. and can be produced by mass blanking.
Specifically, in this embodiment, the support body 10 may be made of an FR-4 composite material, where the FR-4 composite material is made of a tetra-functional epoxy resin, a filler and glass fibers, and the FR-4 material has good mechanical strength, electrical insulation performance and high temperature resistance, is easy to process and cut, and is suitable for mass production.
The support 10 may be a CEM-1 or CEM-2 substrate, typically made of cellulose paper impregnated with phenolic resin or epoxy resin, or a polyimide PI substrate having excellent heat resistance, electrical insulation and mechanical properties, and being used for high-performance or high-reliability electronic applications.
Preferably, the material of the insulating layer 11 is the same as that of the support body 10, and thus, the insulating layer 11 has the same performance as the support body 10;
The supporting body 10 and the insulating layer 11 are made of common printed circuit board substrate materials, and the printed circuit board drilling, embedded resistor-capacitor, lamination and other process technologies, compared with the prior art that ceramic materials and ceramic processes are adopted, the printed circuit board substrate materials can be directly laminated in a large area during manufacturing, so that the manufacturing efficiency is improved, and the cost is reduced.
Preferably, the safety circuit 12 is an alloy of one or any combination of tin, lead, copper, silver, zinc, aluminum.
The safety circuit 12 forms a weak electrical connection with the external circuit, which allows the external circuit to operate normally, but also through the safety circuit 12 without fusing the safety circuit 12.
Specifically, the safety circuit 12 is a thin metal layer which is formed by chemical deposition, vapor deposition, sputtering or electroplating on the inflow pad 17, the outflow pad 18 and the control pad 19, wherein the thin metal layer is made of one of tin, lead, copper, silver, zinc and aluminum or composite alloy materials.
In the embodiment of the utility model, the safety circuit 12 is preferably a thin metal layer made by electroplating tin, and the safety circuit 12 has good conductivity due to good conductivity of tin.
Referring to fig. 3 to 8, the specific implementation steps of an embodiment of the present utility model are as follows:
The method comprises the following steps of blanking, wherein a common PCB substrate except a ceramic substrate and a metal substrate is adopted as a support body 10, and the support body 10 is preferably an organic substrate and a resin substrate;
Patterning the upper surface of the support body 10, adding a heating body 13 and heating end pads 131 added at two ends of the heating body;
Step three, laminating an insulating layer 11 and a copper foil on the upper surfaces of a support body 10 and a heating body 13 for the first time, wherein the copper foil forms three bonding pads and a connecting terminal, the three bonding pads are an inflow bonding pad 17, an outflow bonding pad 18 and a control bonding pad 19, and the connecting terminal is a control terminal 16;
Drilling holes on the insulating layer 11 corresponding to the heating end bonding pads 131 at two ends of the heating element 13 to form conductive holes 111, wherein the control terminal 16 is conducted with the heating end bonding pad 131 at one end of the heating element 13 through the conductive holes 111, and the control bonding pad 19 is conducted with the heating end bonding pad 131 at the other end of the heating element 13 through the conductive holes 111;
Fifthly, copper deposition and electroplating are carried out for the first time, so that the conductive holes 111 are conductive;
step six, making a second graph, namely making a circuit on the upper surface and the lower surface of the three-terminal insurance structure;
adding one layer of one or composite alloy of tin, lead, copper, silver, zinc and aluminum on the three bonding pads in a chemical deposition, evaporation, sputtering or electroplating mode to obtain a thin metal layer serving as a safety circuit 12, wherein the safety circuit 12 is electrically connected with the three bonding pads;
Step eight, manufacturing a solder mask, namely uniformly coating a layer of solder mask material on the surface of the safety circuit 12 to obtain a solder mask layer 20;
Step nine, electroplating and thickening the control terminal 16, and electroplating on the inflow bonding pad 17 and the outflow bonding pad 18 to form an inflow terminal 14 and an outflow terminal 15;
Coating a solder resist material on the lower surface of the support body 10 as a protective layer 21;
and step eleven, cutting single grains, and cutting the whole large base material into the size of a single product to finish the manufacture of the three-terminal safety structure.
The above embodiments are only intended to illustrate the technical solution of the utility model and not to limit it, the technical features of the above embodiments or of the different embodiments can be combined under the new idea of the present application, the steps can be implemented in any order, and there are many other variations of the different aspects of the utility model as above, which are not provided in details for the sake of brevity, although the present utility model is described with reference to the previous embodiments
While the utility model has been described in detail, it will be understood by those skilled in the art that the foregoing embodiments may be modified or equivalents may be substituted for some of the features thereof, and that these modifications or substitutions may be made without departing from the spirit of the embodiments of the utility model.
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422182316.9U CN223206212U (en) | 2024-09-05 | 2024-09-05 | Three-terminal safety structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202422182316.9U CN223206212U (en) | 2024-09-05 | 2024-09-05 | Three-terminal safety structure |
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| Publication Number | Publication Date |
|---|---|
| CN223206212U true CN223206212U (en) | 2025-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202422182316.9U Active CN223206212U (en) | 2024-09-05 | 2024-09-05 | Three-terminal safety structure |
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| CN (1) | CN223206212U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119584423A (en) * | 2024-09-05 | 2025-03-07 | 东莞市恒闪科技有限公司 | A three-terminal fuse structure based on circuit board structure and manufacturing method thereof |
-
2024
- 2024-09-05 CN CN202422182316.9U patent/CN223206212U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119584423A (en) * | 2024-09-05 | 2025-03-07 | 东莞市恒闪科技有限公司 | A three-terminal fuse structure based on circuit board structure and manufacturing method thereof |
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