CN111613494A - An adjustable chip fuse for low power power supply - Google Patents

Abstract

The invention relates to an adjustable chip fuse for low-power power supply. The invention includes a casing, a first end face electrode, a second end face electrode, a metal slot, a fuse body and a movable slotted cover; the first end face electrode and the second end face electrode are respectively fixed on the left and right sides of the bottom of the casing. The metal slot is located in the inner cavity of the casing, and the two ends are connected to the first end face electrode and the second end face electrode; the left and right ends of the casing are provided with an opening, the width of the opening is equal to the diameter of the fuse body, and the height of the opening can make the metal contact piece of the fuse body touch the metal slot; the fuse body and the shell The left and right ends of the frame are clamped, and are movably clamped to the movable slotted cover. The invention can quickly and conveniently adjust the fusing current of the fuse without replacing the fuse body.

Description

An adjustable chip fuse for low power power supply

technical field

The invention relates to the technical field of low-power power supply circuit protection devices, in particular to an adjustable chip fuse for low-power power supplies.

Background technique

With the rapid development of power electronic technology, the relationship between power electronic equipment and people's work and life is increasingly close. Electronic devices are inseparable from reliable power supplies, and low-power power supplies are also used in various occasions. More and more power supplies have very strict requirements on protection circuits, and fuses often restrict the protection and application of low-power power supplies.

A fuse, usually used as a circuit protection device, forms an electrical connection with the components in the circuit to be protected. Typically, a fuse has its own unique current rating, which is determined by the metal parts that make up the fuse. With the development of the current electronics industry, the requirements for miniaturization and integration of components in the field of power products are getting higher and higher, and the size of chip protection components is also greatly reduced. At the same time, whether it is electronic products, intelligent equipment or various power equipment in the industrial field, power supply is required. Low-power power supplies have higher and higher requirements for the miniaturization and reliability of fuses, especially in power circuit protection, fuses need to meet the strict requirements of equipment: their characteristics should be clean and neat, high resistance after breaking, and the entire fusing process. Conducted inside the package, the arc suppression characteristics should be good, and it should be able to withstand shock and vibration.

The existing chip fuses are still in the stage where a fuse can only be used in a specific power circuit, or when the fuse is burned out, it can only be replaced by another fuse of the same type. The problems caused by this state It can only be replaced by professionals, and it is very troublesome to replace each time; at the same time, since most of the SMD fuses are welded, and the life of the PCB pads is limited, multiple welding will also cause the PCB of the power circuit to be damaged. Heat damage; in the early stage of the design of the product circuit, it is necessary to test the various indicators of the power supply, and to adjust the fusing current of the fuse to achieve the purpose of debugging various states; some fuses may not be truly meaningful due to the problem of fusing space. fuse. Therefore, an adjustable chip fuse for low-power power supply is researched, which can quickly and conveniently adjust the fuse current without replacing the fuse body, or when the fuse of the circuit is blown, it can be timely. It is of great significance to replace the fuse wire.

SUMMARY OF THE INVENTION

Aiming at the above-mentioned shortcomings in the prior art, the technical problem to be solved by the present invention is to provide an adjustable chip fuse for low-power power supplies, which can be quickly and conveniently used without replacing the fuse body. Adjust the fusing current of the fuse, and replace the fuse in time when the fuse of the circuit is blown

The technical scheme adopted by the present invention to achieve the above purpose is: an adjustable chip fuse for low-power power supply, comprising a casing, a first end face electrode, a second end face electrode, a metal slot, a fuse body and a Move the slotted cover;

The first end face electrode and the second end face electrode are respectively fixed on the left and right ends of the bottom of the casing, and are fully or partially exposed to the casing; the metal slot is located in the inner cavity of the casing, and the two ends are connected to each other. The first end face electrode and the second end face electrode; the left and right ends of the casing are provided with openings, the width of the opening is equal to the diameter of the fuse body, and the height of the opening can make the fuse body The metal contact piece is in contact with the metal slot; the fuse body is clipped with the left and right ends of the casing, and is movably clipped on the movable slotted cover.

The housing includes an upper substrate, a lower substrate, a left substrate and a right substrate; the upper substrate is connected to the lower substrate, the left end of the connection structure is connected to the left substrate, and the right end is connected to the right substrate.

The upper substrate includes an integrally formed front cover, an upper cover and a rear cover; the bottoms of the front cover and the rear cover are connected to the lower substrate, and the front cover, the upper cover and the rear cover The left end is connected to the left base plate, and the right end is connected to the right base plate.

The inner cavity of the shell is filled with thermal insulation filler.

The metal card slot includes an elastic element and two connecting parts, the elastic element is connected between the two connecting parts; each connecting part includes a metal contact surface, a left metal card and a right metal card, the metal card The contact surface is fixed on the bottom surface of the left metal card and the right metal card, and is used for connecting with the first end surface electrode or the second end surface electrode, and the distance between the left metal card and the right metal card is the same as that of the fuse body. The thickness of the metal contact sheet, and the opposite sides of the left metal card and the right metal card are provided with two semicircular spherical surfaces, and the spherical surfaces are arranged to intersect.

The upper parts of the left metal card and the right metal card are open to the outward oblique side.

Metal conductors are provided below the lowermost spherical surfaces of the left metal card and the right metal card, and the metal conductors are flush with the tangents of the corresponding spherical surfaces.

The fuse main body includes a metal contact piece, a rotating device, an arc-extinguishing cavity, a fuse wire and an outer cavity; the rotating devices are two, which are respectively sealed and connected to both ends of the arc-extinguishing cavity; the rotating device The equipment is a circular structure, and the metal contact pieces are connected at opposite ends; the metal contact pieces are located at the position where the rotating equipment is connected with the arc extinguishing cavity; between two metal contact pieces connecting different rotating equipment Connect several fuse wires of the same grade or different grades, the fuse wires are located inside the arc-extinguishing cavity, and the arc-extinguishing cavity has built-in arc-extinguishing materials; the outside of the arc-extinguishing cavity wraps the outer cavity body.

Two ends of the outer cavity are respectively provided with grooves matching with the openings.

The fuse body further includes a handle, the handle is made of insulating material and is connected to the other side of the rotating device relative to the arc extinguishing cavity.

The present invention has the following advantages and beneficial effects:

1. The present invention can adjust the fusing current of the fuse quickly and conveniently without replacing the fuse body, and when the fuse of the circuit is blown, the fuse wire can be replaced in time, which improves the multiple times of the fuse in the circuit. Use performance, adjustable performance, improve operating performance, reduce the difficulty of circuit research and development, reduce research and development costs, ensure the reliability of research and development, and facilitate product testing and use.

2. The main structure of the fuse of the present invention realizes that a fuse has a plurality of the same or different fuse currents, and can select different fuse currents according to the actual application, which improves the selectivity of the fuse.

3. The main structure of the fuse of the present invention can be used continuously without replacing the fuse when one fuse is blown, which improves the usability of the fuse and increases the repeatability of the fuse; The structure is complete and the service life is prolonged.

4. Each fuse wire of the present invention has an independent arc extinguishing cavity, which ensures fast and reliable fusing of the fuse wire, ensures the fast response of the fuse, and improves the reliability of the equipment.

5. The outer cavity of the present invention contains each independent arc-extinguishing cavity, which effectively prevents the entry of foreign objects, ensures the performance index of the fuse, prevents the arc-extinguishing cavity from contacting other objects, and improves the performance of the fuse. the stability of the fuse.

6. The present invention adopts the structure of the fuse metal slot, each metal slot has a protruding part, and an elastic element is connected with the middle of the metal slot. This structure is conducive to the locking of the metal contact piece, and increases the The operability of the fuse ensures the effective contact of the fuse and improves the reliability of the fuse.

7. The present invention adopts the structure of handle and moving slot, which enhances the practical performance of the fuse and makes the operation simple and reliable.

Description of drawings

1 is a schematic diagram of the overall structure of the fuse of the present invention;

2 is a sectional view of the fuse of the present invention;

Fig. 3 is the fuse side view of the present invention;

4 is a schematic diagram of a metal card slot of the present invention;

FIG. 5 is a structural diagram of the main body of the fuse of the present invention.

1 is the upper substrate, 2 is the lower substrate, 3 is the left substrate, 4 is the right substrate, 5 is the first end face electrode, 6 is the second end face electrode, 7 is the metal slot, 8 is the fuse body, and 9 is the fuse body. Move the slotted cover.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

As shown in Figures 1-3, an adjustable chip fuse for low-power power supply includes a casing, a first end face electrode 5, a second end face electrode 6, a metal slot 7, a fuse body 8 and a movable Slotted cover plate 9; wherein, the housing includes an upper substrate 1, a lower substrate 2, a left substrate 3 and a right substrate 4; the upper substrate 1 is connected to the lower substrate 2, and the left end of the connection structure is connected to the left substrate 3, The right end is connected to the right base plate 4 . The upper substrate 1 includes an integrally formed front cover, an upper cover and a rear cover; the bottoms of the front cover and the rear cover are connected to the lower substrate, and the front cover, the upper cover and the rear cover are The left end is connected to the left substrate, and the right end is connected to the right substrate. The upper substrate 1 , the lower substrate 2 , the left substrate 3 and the right substrate 4 are connected together to form a cavity or a cavity with fillers. The first end surface electrode 5 and the second end surface electrode 6 are connected to the front cover plate and a part of the rear cover plate of the upper substrate 1 , and are also connected to the left substrate 3 and the right substrate 4 . The first end surface electrode 5 and the second end surface electrode 6 can be wrapped on the outside of the cover plate and the base plate or embedded in the inside of the cover plate and the base plate, forming a whole with the cover plate and the base plate. The metal slot 7 is connected with the first end surface electrode 5 and the second end surface electrode 6, and can be wrapped by a filler in the cavity, and the filler is a heat-insulating and insulating material. The fuse main body 8 is connected with the left base plate 3 and the right base plate 4 , and at the same time is movably connected with the movable slotted cover plate 9 .

The upper substrate 1 can be cold-pressed or hot-pressed to form a desired contact surface through a molding die with a specific shape, and then solidified to form; or the cavity can be realized by etching or machining after solidifying the material. If necessary, heat-insulating and insulating fillers can be added to the cavity, and the volume of the fillers should take into account the movement trajectory of the fuse body 8 . The upper substrate 1 mainly includes a front cover plate, a rear cover plate and an upper cover plate in the overall schematic diagram of the fuse shown in FIG. The cover plate, the rear cover plate and the three inner wall fillers of the upper cover plate are composed of three inner wall fillers, which are wrapped on the three sides of the fuse body 8, but ensure that the slotted cover plate 9 or the front cover plate, the rear cover plate and the upper cover plate are moved. There are slots in the three inner wall fillers of the same size as the fuse body 8 to ensure the movement of the fuse body 8 . The upper substrate 1 mainly protects the outer structure of the fuse body 8 to prevent other foreign objects from colliding with the fuse body 8 and affecting the performance and life of the fuse.

The lower substrate 2 can cold-press or hot-press the raw material to form the required contact surface through a molding die with a specific shape, and then solidify and form; or the cavity can also be realized by etching or machining after solidifying the material. A filler that can add thermal insulation to the cavity is required. The lower substrate 2 is mainly the carrier of the first end surface electrode 5 and the second end surface electrode 6 shown in FIG. , forming a cavity with open left and right sides, like the upper substrate 1, but it can be an empty cavity or a cavity with filler, but the operating space between the metal slot 7 and the fuse body 8 must be guaranteed. , to ensure the free movement of the fuse body 8 .

The left base plate 3 and the right base plate 4 mainly form a cavity with the upper base plate 1 , and together with the lower base plate 2 form a fuse shell, which plays the role of protecting the fuse main body 8 and the role of a bracket. The surfaces of the left substrate 3 and the right substrate 4 are respectively connected with the first end surface electrode 5 and the second end surface electrode 6 , which can be seamless connection or the end surface electrodes are wrapped on the outer surfaces of the left substrate 3 and the right substrate 4 . The left base plate 3 and the right base plate 4 need openings, the size of which is the same as the diameter of the fuse body 8, and the height is not less than the metal contact piece 8-1 in the fuse body 8 and the metal slot 7 just touching the distance to ensure the fuse The main body 8 of the fuse can rotate smoothly, while ensuring the normal movement of the main body 8 of the fuse.

The manufacturing method of the first end surface electrode 5 and the second end surface electrode 6 is as follows: metal thin layers are formed on the upper substrate 1 , the lower substrate 2 , the left substrate 3 and the right substrate 4 by pressing metal copper sheets or sputtering electroplating, Then, the metal thin layer is etched with end-face electrodes according to the required size. The end-face electrodes can be wrapped around the upper substrate 1, the lower substrate 2, the left substrate 3 and the right substrate 4, or embedded in the upper substrate 1 and the lower substrate 2. , the left base plate 3 and the right base plate 4 . The first end surface electrode 5 and the second end surface electrode 6 are mainly used for welding with the pads of the PCB to ensure that the fuse and the PCB can be effectively combined.

As shown in FIG. 4 , the metal slot 7 includes an elastic element 7-4 and two connecting parts, and the elastic element is connected between the two connecting parts. The two connecting parts have the same structure, and both include a left metal card 7-1, a metal connecting surface 7-2 and a right metal card 7-3. The main functions of the metal card slot 7 are: (1) to be electrically connected with the first end face electrode 5 and the second end face electrode 6; (2) with the metal contact piece 8-1 in the fuse body 8 (as shown in FIG. 5 ) ) contact, and lock. The metal slot 7 ensures the electrical connection of the fuse, improves the reliability of the fuse, and ensures its stability.

The left metal card 7-1 and the right metal card 7-3 have semicircular spherical surfaces, and at the same time, the lowermost ball takes the spherical surface as a tangent to add a contact metal conductor. The distance between the left metal card 7-1 and the right metal card 7-3 is the thickness of the metal contact piece 8-1, and the spherical surfaces of the left metal card 7-1 and the right metal card 7-3 are in an intersecting layout. At the same time, the upper half of the left metal card 7-1 and the right metal card 7-3 are in the shape of an oblique side opening, which can be cast by a molding die.

The metal contact surface 7-2 is connected with the left metal card 7-1 and the right metal card 7-3 by electroplating or other methods, and is connected with the first end surface electrode 5 and the second end surface electrode 6 at the same time, ensuring effective connection.

The elastic element 7-4 is on the side of the left metal card 7-1/right metal card 7-3, which ensures the pressing of the metal contact piece 8-1.

As shown in FIG. 5 , the fuse body 8 includes a metal contact piece 8-1, a rotating device 8-2, a handle 8-3, an arc extinguishing cavity 8-4, a fuse wire 8-5 and an outer cavity 8-6. The fuse body 8 mainly ensures the installation of different fuse wires or a plurality of identical fuse wires, the installation of metal contact pieces, and the installation of the arc extinguishing cavity and the outer cavity.

The metal contact piece 8-1 is connected with the fuse wire 8-5, and is located at the position where the rotating device 8-2 is connected with the arc extinguishing cavity 8-4. The fuse can be installed with 1 to N fuses 8-5 of the same grade or different grades according to different needs. The arc extinguishing cavity 8-4 forms a closed connection with the rotating device 8-2, and seals the fuse wire 8-5 inside. At the same time, an arc extinguishing material is placed in the arc extinguishing cavity 8-4. The outer cavity 8-6 is wrapped outside the arc extinguishing cavity 8-4 to form a sealed cavity. At the same time, the arc extinguishing chamber 8-4 is connected to the rotating device 8-2. The handle 8-3 is integrally cast with the rotating device 8-2, that is, an insulator that protrudes from the outside of the rotating device 8-2 at a distance of one end. Except for the metal contact piece 8-1 and the fuse wire 8-5, the others are all insulating materials. A serial number is engraved on the rotating device 8-2, and the position of the serial number is consistent with the position of the actual contact piece of the fuse 8-5, which is beneficial to the adjustment of the fuse 8-5. At the same time, the outer cavity 8-6 of the fuse main body 8 has a groove that matches the openings of the left base plate 3 and the right base plate 4, so as to ensure that the fuse main body 8 moves smoothly up and down.

The main body of the fuse realizes that a fuse has multiple same or different fuse currents, and different fuse currents can be selected according to the actual application, which improves the selectivity of the fuse; it can not replace the fuse when one fuse is blown Continued use improves the availability of the fuse and increases the repeatability of the fuse; the arc-extinguishing cavity ensures that each fuse has an independent arc-extinguishing cavity, which ensures fast and reliable fusing of the fuse and ensures The fast response of the fuse is improved, and the reliability of the equipment is improved. The outer cavity contains each independent arc-extinguishing cavity, which effectively prevents the entry of foreign objects, ensures the performance index of the fuse, prevents the arc-extinguishing cavity from contacting other objects, and improves the fusing performance. device stability.

The fuse main body 8 is mainly composed of different or the same fuse wires. By rotating the fuse main body, different currents can be adjusted. When a group of fuse wires is blown, the main body can also be rotated to replace the fuse wires.

The movable slotted plate 9 is mainly made of soft material with insulation and heat insulation, and is made into a slot with the edges of the openings of the left base plate 3 and the right base plate 4, which is conducive to the sealing of the fuse body 8, mainly for the left base plate. 3 and the opening of the right base plate 4 are sealed, and at the same time, it is used to clamp the fuse body 8 to ensure that the fuse does not enter other objects during use, and at the same time to ensure that the fuse body 8 will not move, improving the fuse Reliability and stability ensure the safety of the entire circuit.

The processing flow of a small-power adjustable chip fuse of the present invention is as follows:

(1) Processing the upper substrate, the lower substrate, the left substrate and the right substrate;

(2) Electroplating or embedding the first end surface electrode and the second end surface electrode on the upper substrate, the lower substrate, the left substrate and the right substrate;

(3) Process the metal slot, install the metal slot on the two end face electrodes, and fix it;

(4) Process the main body of the fuse, and insert a certain metal piece of the main body of the fuse into the metal slot;

(5) Encapsulate the upper substrate, the lower substrate, the left substrate and the right substrate, or add corresponding insulating and heat-insulating objects before sealing.

Claims (10)

1. an adjustable patch type fuse for low-power power supply, is characterized in that, comprises shell, first end face electrode, second end face electrode, metal slot, fuse main body and moving slotted cover plate; The first end face electrode and the second end face electrode are respectively fixed on the left and right ends of the bottom of the casing, and are fully or partially exposed to the casing; the metal slot is located in the inner cavity of the casing, and the two ends are connected to each other. The first end face electrode and the second end face electrode; the left and right ends of the casing are provided with openings, the width of the opening is equal to the diameter of the fuse body, and the height of the opening can make the fuse body The metal contact piece is in contact with the metal slot; the fuse body is clipped with the left and right ends of the casing, and is movably clipped on the movable slotted cover. 2 . The adjustable chip fuse for low-power power supply according to claim 1 , wherein the housing comprises an upper substrate, a lower substrate, a left substrate and a right substrate; the upper substrate is connected to the In the lower substrate, the left end of the connection structure is connected to the left substrate, and the right end is connected to the right substrate. 3 . The adjustable chip fuse for low-power power supply according to claim 1 , wherein the upper substrate comprises an integrally formed front cover, an upper cover and a rear cover; 3 . The bottoms of the front cover and the rear cover are connected to the lower substrate, the left ends of the front cover, the upper cover and the rear cover are connected to the left substrate, and the right ends are connected to the right substrate. 4 . The adjustable chip fuse for low-power power supply according to claim 1 , wherein the inner cavity of the casing is filled with a thermal insulation filler. 5 . 5 . The adjustable chip fuse for low-power power supply according to claim 1 , wherein the metal card slot comprises an elastic element and two connecting parts, and the elastic element is connected to the two connecting parts. 6 . between the connecting parts; each connecting part includes a metal contact surface, a left metal card and a right metal card, the metal contact surface is fixed on the bottom surfaces of the left metal card and the right metal card, and is used for connecting with the The first end surface electrode or the second end surface electrode is connected, the distance between the left metal card and the right metal card is the thickness of the metal contact piece of the fuse main body, and the opposite sides of the left metal card and the right metal card are provided. There are two semicircular spheres that intersect the layout. 6 . The adjustable chip fuse for low-power power supply according to claim 5 , wherein the upper parts of the left metal card and the right metal card are of an outwardly inclined opening type. 7 . 7 . The adjustable chip fuse for low-power power supply according to claim 5 , wherein metal conductors are provided under the lowermost spherical surfaces of the left metal card and the right metal card. 8 . , the metal conductor is flush with the tangent of its corresponding spherical surface. 8 . The adjustable chip fuse for low-power power supply according to claim 1 , wherein the fuse body comprises a metal contact piece, a rotating device, an arc-extinguishing cavity, a fuse and The outer cavity; the two rotating devices are sealed and connected to both ends of the arc-extinguishing cavity respectively; the rotating device is a circular structure, and the metal contact pieces are connected to opposite ends; the metal The contact piece is located at the position where the rotating equipment is connected with the arc extinguishing cavity; a number of fuses of the same level or different levels are connected between the two metal contact pieces connecting different rotating equipment, and the fuse fuses are located in the arc extinguishing cavity. Inside the cavity, an arc-extinguishing material is built in the arc-extinguishing cavity; the outer cavity of the arc-extinguishing cavity is wrapped around the outer cavity. 9 . The adjustable chip fuse for low-power power supply according to claim 8 , wherein two ends of the outer cavity are respectively provided with grooves that match the openings. 10 . 10. The adjustable chip fuse for low-power power supply according to claim 8, wherein the fuse body further comprises a handle, and the handle is made of insulating material and is connected to the rotating The device is opposite to the other side of the arc extinguishing chamber.

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