Small switching device for supplying large current

Abstract

The utility model belongs to the field of small-sized switching devices for supplying large current, which comprises an upper cover and a lower cover, a circular rotating device capable of independently rotating is arranged between the upper cover and the lower cover, a conductive wire is wound in the rotating device, and the conductive wire rotates along with the rotating device to realize stretching and retracting of the conductive wire. Two conductive supports and a copper-clad circuit board are further arranged in the rotating device, the conductive supports are arranged on the copper-clad circuit board and are electrically connected, one end of the conductive wire is electrically connected with the copper-clad circuit board, and the conductive supports are arranged in a bilateral symmetry mode with the rotating device as the axis and used for providing stable supporting force and dispersing current. Therefore, electric arc and heat risks generated by current are reduced. The conductive bracket and the copper-clad circuit board are symmetrically arranged, and the distance between the upper surface of the plastic seat and the corresponding side of the output circuit board is set in a specific range, so that good conductive wire and rotation performance are realized, and the problem that high-temperature electric arcs are easy to generate in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electronic product technology, especially relate to small -size adapter for supplying large current. BACKGROUND

[0002] The charging power of the current electronic products (such as mobile phone, tablet computer and other products) is gradually provided to adapt to the demand of fast charging. But under this precondition, the safety demand of charging device is also improved, because large current and large power, the demand of wire and electronic component contact point is also greatly improved, otherwise it will lead to the generation of high temperature arc, thereby affecting the safety and charging efficiency of electronic products and charging device.

[0003] The current large power charging device and current conversion device for electronic products are almost in direct communication mode (that is, directly connected with wires and electronic products from the plug), to avoid the above arc safety problem. But because the length of the wire is longer, it leads to inconvenience in carrying and storage.

[0004] At present, the most convenient storage and carrying is the storage line in the form of a spring, for example, the prior art CN213602112U, which can solve the problem of straight connection of the wire through bidirectional stretching or contraction, and the internal winding storage mode (the wire of nearly 2 meters can be realized, and the shell of the size of the palm can be contracted). At the same time, it can realize the use scene of large power. But its disadvantage is that when using, both ends must be stretched at the same time, which limits its application scene.

[0005] Subsequently, some adapter devices that can realize one-way stretching appear, for example, the prior art CN211088640U, which adopts a technical scheme of two sliding contacts and concentric circular circuit cooperation to realize one-way stretching and storage of the wire. And the prior art CN220324887U, which adopts a technical scheme of conductive ball, two magnetic parts and conductive loop to realize one-way stretching and storage of the wire. The advantages of these two technical schemes are that they can realize one-way stretching and contraction, which can realize the approximate effect of double stretching, and can also be used in combination with other electrical appliances, such as fixed connection with power bank or socket at one end. The use scene is relatively wide, and it is more convenient.

[0006] However, the above two single-pulling technical solutions can only be applied to low-power and small-current application scenarios. Because the electrical connection scheme between the rotating structure and the fixed stationary structure is prone to arc problems. For example, in the technical solution of CN211088640U, the sliding contact and the concentric circular circuit ring are simply matched, and if the device is shaken or the wire is pulled, the sliding contact and the concentric circular circuit ring will be in poor contact or in a state of intermittent contact for a short time, which is prone to produce arc and high temperature (similar to the spark and arc produced when a high-power circuit breaker is closed). In addition, it is difficult to dissipate heat after high temperature is generated at the contact, which increases the thermal load and further increases the failure rate. In CN220324887U, conductive balls, two magnetic parts and a conductive loop are used in cooperation to attract the conductive loop with the magnetic parts, so that the conductive loop and the conductive balls are in close contact, thereby avoiding the intermittent conduction state caused by shaking or pulling the wire. However, because the conductive balls are used as the conductive medium and the conductive loop is a planar structure, a problem arises that the contact between the two is a point and a surface, and the contact position is almost a point-to-point conductive state. In this case, if a large current passes through, the small contact surface is more prone to high temperature and unstable state. Moreover, this structure requires the installation of multiple balls, which makes the production process difficult and the product structure complex.

[0007] Therefore, a stable and reliable technical solution is needed to solve the electrical connection between the rotating structure and the fixed stationary structure in the case of high-power power supply, without easily causing contact arc, while achieving good heat dissipation, and keeping the structure as simple as possible to facilitate the production process. Practical new type content

[0008] The utility model aims at solving the above defects, and provides a small-sized switching device for supplying large current, which solves one of the problems in the background art through a reliable technical structure.

[0009] The utility model aims at solving the above defects, and provides a small-sized switching device for supplying large current, which solves one of the problems in the background art through a reliable technical structure.

[0010] A small-sized switching device for supplying large current, comprising an upper cover and a lower cover, a circular rotating device capable of rotating independently is arranged between the upper cover and the lower cover, a conductive wire is wound in the rotating device and fixed at one end, the conductive wire is stretched and retracted with the rotation of the rotating device, two conductive supports and a copper-clad circuit board are further arranged in the rotating device, the conductive supports are arranged on the copper-clad circuit board and form an electrical connection, one end of the conductive wire is electrically connected with the copper-clad circuit board, and the conductive supports are symmetrically arranged around the rotating device as the axis, which is used to provide stable supporting force and disperse current, so as to reduce the risk of arc and heat generated by current.

[0011] Further, the copper-clad circuit board is in U-shaped structure, the conductive support is arranged on two ends of the U-shaped structure respectively, and is arranged symmetrically with the rotating device as the axis, a groove is arranged on the rotating device, and the copper-clad circuit board is arranged in the groove. The copper-clad circuit board is designed in an integrated structure, the heat dissipation area is increased, the rotation stability is maintained, and good heat dissipation is realized.

[0012] Further, the arc-shaped elastic sheet is six. The contact area is increased, the stability of the elastic force is ensured, and intermittent conduction is prevented.

[0013] Further, the inner side of the lower cover is provided with a containing cavity, an output circuit board is arranged in the containing cavity, the output circuit board is in circular structure, six annular conductive rings are arranged on the side of the output circuit board facing the conductive support, the conductive rings and the arc-shaped elastic sheet are in corresponding contact, a rectangular conductive sheet is extended from the edge of the output circuit board, and six conductive pins are arranged on the rectangular conductive sheet and electrically connected with the conductive rings.

[0014] Further, the distance between the upper surface of the plastic seat and the side corresponding to the output circuit board is 0.3-1.4 mm. Within the data value, the arc-shaped elastic sheet can realize the best conductive effect, good contact can be realized in the interval, so that arc is avoided, and the contraction function can realize normal operation.

[0015] Further, the rotating device further comprises a rotating disc, the rotating disc is in convex structure, the convex part is a clasp, a coil spring is arranged in the clasp, the middle part of the wire is wound around the periphery of the clasp, the center of the clasp and the rotating disc is a through hole structure, the edge of the clasp is provided with a bayonet, and the groove is arranged below the rotating disc, and a guide rail is arranged around the groove.

[0016] Further, the central part of the inner side of the upper cover is provided with a rotating shaft and a buckle, the corresponding lower cover is provided with a shaft hole and a clamping groove, the rotating shaft is provided with a slot in the vertical direction, the rotating shaft passes through the through hole in the center of the clasp, one end of the coil spring passes through the slot and is fixed on the rotating shaft, the other end of the coil spring is fixed on the bayonet, and the edge of the upper cover is further provided with an opening for the conductive wire to enter and exit.

[0017] Further, a guide groove is arranged on the peripheral edge of the containing cavity, a guide piece is arranged in the guide groove, and the guide piece and the guide rail are arranged correspondingly

[0018] The utility model discloses the beneficial effect is: through the symmetrical setting of conductive support and copper-clad circuit board, and the distance between the upper surface of plastic seat and the side corresponding to output circuit board is arranged in the specific range, realizes good conductive wire and rotation, thereby solve the problem of high temperature arc that is easy to produce in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a perspective view of the upper cover of the present embodiment; Figure 1 Figure 2 is a perspective view of the upper cover of the present embodiment;

[0020] Figure 3 is an exploded view of the upper cover of the present embodiment; Figure 2 Figure 4 is an exploded view of the upper cover of the present embodiment;

[0021] Figure 5 is a perspective view of the lower cover of the present embodiment; Figure 3 Figure 6 is an exploded view of the lower cover of the present embodiment;

[0022] Figure 7 is a perspective view of the lower cover of the present embodiment; Figure 4 Figure 8 is a perspective view of the lower cover of the present embodiment;

[0023] Figure 9 is a top view of the rotating device of the present embodiment; Figure 5 Figure 10 is a bottom view of the rotating device of the present embodiment;

[0024] Figure 11 is an exploded view of the rotating device of the present embodiment; Figure 6 Figure 12 is an exploded view of the rotating device of the present embodiment;

[0025] Figure 13 is an exploded view of the rotating device of the present embodiment; Figure 7 Figure 14 is an exploded view of the rotating device of the present embodiment;

[0026] Figure 15 is an exploded view of the rotating device and the conductive bracket of the present embodiment; Figure 8 Figure 16 is an exploded view of the conductive bracket and the output circuit board of the present embodiment;

[0027] Figure 17 is an exploded view of the conductive bracket and the output circuit board of the present embodiment; Figure 9 Figure 18 is an exploded view of the conductive bracket and the output circuit board of the present embodiment;

[0028] In the figure, 1 is the upper cover, 101 is the rotating shaft, 102 is the buckle, 2 is the rotating device, 201 is the rotating disc, 202 is the snap ring, 2021 is the snap opening, 203 is the groove, 204 is the guide rail, 206 is the coil spring, 207 is the threading hole, 3 is the lower cover, 301 is the shaft hole, 302 is the accommodating cavity, 303 is the guide slot, 304 is the guide piece, 305 is the clamping slot, 306 is the output hole, 4 is the copper-clad circuit board, 401 is the soldering point, 5 is the conductive bracket, 501 is the plastic base, 502 is the arc-shaped elastic piece, 6 is the output circuit board, 601 is the conductive ring, 602 is the conductive sheet, and 8 is the conductive wire. DETAILED DESCRIPTION

[0029] The present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] For the convenience of understanding, the present utility model will be described in further detail below in conjunction with specific embodiments but is not intended to limit the present utility model.

[0031] Embodiment: Reference Figure 1 、 2A small adapter for supplying large current, mainly comprising three major components, namely the upper cover 1, the lower cover 3 and the rotating device 2 therebetween. One end of the conductive wire 8 is fixedly connected with the rotating device 2. The upper cover 1 and the lower cover 3 are in a fixed and stationary state, and the rotating device 2 can rotate in both clockwise and counterclockwise directions, thereby achieving the purpose of stretching and retracting the conductive wire 8. The periphery of the upper cover 1 and the lower cover 2 is provided with a buckle 102 and a clamping groove 305, respectively, which are correspondingly clamped to achieve the purpose of stable closure.

[0032] Reference Figure 2 , 3 ,4, a rotating shaft 101 is provided on the inner side of the upper cover 1 towards the lower cover 3, a through hole is provided on the rotating device 2, and an axle hole 301 is provided on the inner side of the lower cover 3. The rotating shaft 101 is inserted into the axle hole 301 through the through hole on the rotating device 2. The rotating device 2 can rotate around the rotating shaft 101.

[0033] Reference Figure 5 ,6,7, the rotating device 2 mainly comprises a rotating disc 201 and a clamping ring 202 protruding upwards along the center of the rotating disc 201. One end of the conductive wire 8 is fixedly welded to the welding point 401 of the copper-clad circuit board 4 through a threading hole 207, thereby achieving the purpose of fixing one end of the conductive wire 8 to the rotating device 2. The middle part of the conductive wire 8 is wound around the periphery of the clamping ring 202. The edge of the upper cover 1 is also provided with an opening for the conductive wire 8 to pass in and out. A coil spring 206 is provided inside the clamping ring 202. One end of the coil spring 206 is fixedly clamped in the clamping hole 2021 on the edge of the clamping ring 202, and the other end is positioned on the through hole of the rotating device 2. A slot is provided on the rotating shaft 101 in the vertical direction, and the end of the coil spring 206 positioned on the through hole is inserted into the slot. In this way, when the conductive wire 8 is stretched outward, the clamping ring 202 and the rotating disc 201 begin to rotate under the tension of the conductive wire 8. Since one end of the coil spring 206 is fixedly connected with the clamping hole 2021, it will expand with the rotation of the rotating disc 201. However, the other end is fixedly connected with the rotating shaft 101 and is in a stationary state, so the coil spring 206 begins to deform and store potential energy (this situation is similar to the working principle of a clockwork). When the tension of the conductive wire 8 disappears, the coil spring 206 will return to its normal state, thereby pulling the conductive wire 8 in and achieving contraction.

[0034] In the working state of high power and large current, it is a difficulty to safely achieve electrical connection between the rotating part and the fixed part in a small space. In the technical solution of the present embodiment, a unique technical solution is adopted to solve this problem. Figure 2,3,8, a groove 203 is arranged on the back side of the rotating disc 201, i.e. the side away from the snap ring 202, and a U-shaped copper-clad circuit board 4 is arranged in the groove 203, the two ends of the copper-clad circuit board 4 are symmetrically arranged on the rotating shaft 101 and the two sides of the through hole, and a conductive support 5 is arranged at the two ends of the copper-clad circuit board 4, the conductive support 5 is composed of a plastic seat 501 and an arc spring 502, the arc spring 502 is arranged in the plastic seat 501, one end of the arc spring 502 is welded with the copper-clad circuit board 4 as a whole, and the other end is in an arc structure to provide an elastic force. Correspondingly, an output circuit board 6 is arranged on the lower cover 3, the lower surface circuit of the output circuit board 6 is in the structure of a conductive ring 601, the arc spring 502 and the conductive ring 601 are in elastic contact to realize electrical connection. The symmetrical arrangement of the copper-clad circuit board 4 ensures the stability and balance between the arc spring 502 and the conductive ring 601 when the rotating disc 201 rotates, avoids disturbance caused by high-speed rotation, and prevents intermittent contact and arc caused by large current. At the same time, the cooperation between the six or more arc springs 502 and the conductive ring 601 reasonably disperses the current, prevents large current from concentrating on a small number of conduction surfaces, and uses the overall copper-clad circuit board 4 for heat dissipation to further protect the safety of the circuit. In this process, in order to further ensure the stability of the current in the transmission process, the distance between the conductive support 5 and the lower surface of the output circuit board 6 is analyzed and verified, the distance L between the plastic seat 501 on the conductive support 5 and the conductive ring 601 on the output circuit board 6 is set to be between 0.3-1.4mm, and the most stable transmission effect is realized.

[0035] In order to electrically connect the device and other peripheral devices to realize the switching of current, a rectangular conductive sheet 602 is arranged outside the output circuit board 6 for expansion. Correspondingly, an output hole 306 is arranged on the lower cover 3, the rectangular conductive sheet 602 is exposed outside the device through the output hole, and external connection is facilitated. At the same time, the shape of the output hole 306 corresponds to the rectangular conductive sheet 602, thereby realizing the function of stabilizing the rectangular conductive sheet 602 and preventing it from shaking inside. The position of the output hole 306 can be set at different positions of the lower cover 3 according to actual needs, and can be flexibly adjusted.

[0036] The outer periphery of the groove 203 of the rotating disc 201 is provided with a guide rail 204, and a corresponding guide groove 303 is provided on the lower cover 3. A I-shaped guide piece 304 is arranged between the guide rail 204 and the guide groove 303. When the guide rail 204 rotates, the guide piece 304 reciprocates in the guide groove 303. Through the cooperation of the guide rail 204 and the guide piece 304, the rotating disc 201 can be stopped at a specific position. The working principle of the guide piece 304 does not belong to the problem to be solved in the technical scheme, and will not be described in detail here. Its working principle can refer to the existing technology CN221862113U, which is also a I-shaped guide piece 304. CN211895572U, CN211545573U and the existing technology in the background art all have relevant detailed descriptions.

[0037] In the design of the present technical scheme, after a long period of testing, it is concluded that, Figure 9 The distance between the middle L is set to be between 0.3-1.4mm, which is the optimal design. If the distance is too large, the conductive wire 8 will be stretched during power-on, resulting in intermittent power-on and arc striking, thereby causing the detection power load instrument to have unstable parameters, indirectly proving that unstable connection occurs in the circuit. If the distance is too small, two situations will occur. One is that the friction force is too large, causing the coil spring 206 to fail quickly during the tensile life test. The other problem is that the friction force is too large, causing rapid wear between the arc spring 502 and the conductive ring 601, which generates metal debris in the conductive ring 601. During rotation, the arc spring 502 and the metal debris contact each other, causing a local discharge effect, which also produces the phenomenon of arc striking.

[0038] The test conditions are as follows:

[0039] 1. Test instrument: power supply, tensile tester, power load instrument, infrared temperature detector, automatic swing device.

[0040] 2. Test conditions: room temperature 25 degrees, voltage 5V.

[0041] 3. Test quantity: 10.

[0042] The test method is to fix the cover of the test sample on the clamp, connect one end of the device to the power supply and the other end to the power load instrument. The tensile tester clamps the wire for stretching, the automatic swing device and the tensile tester are fixed together, the automatic swing device drives the tensile tester to move, and the automatic swing device realizes automatic non-stop extension and retraction. The infrared temperature detector detects the temperature of the shell.

[0043] The final test results are as follows:

[0044]

[0045] If the distance is small, it will cause the tension to be too large, only under the basic condition of less than 300 times of stretching (the standard is that 3000 times of stretching does not appear product quality and high temperature problem), and the highest temperature rises to more than 60 degrees of the standard, and causes the coil spring 206 to fail. After disassembly, it is found that the conductive ring 601 appears serious scratch, metal debris and arc oxidation trace.

[0046] After the distance is too large, only in the range of 100 times of stretching, it also causes the arc phenomenon between the arc spring sheet 502 and the conductive ring 601, causes the unstable current and the temperature rise.

[0047] In the embodiment, as a switching device, the USB plug as shown in the figure can be used as the current input end, and the conductive sheet 602 can be used as the current output end. It can also be reversely arranged to achieve the same effect. In addition, the input or output connector can also adopt TYPE C, DC head and other forms of structure.

[0048] The above is a further detailed description of the utility model in combination with the specific preferred embodiment, and the specific implementation of the utility model cannot be limited to these descriptions. For ordinary skilled persons in the technical field to which the utility model belongs, on the premise of not departing from the concept of the utility model, a number of simple deductions or substitutions can be made, and all of them should be regarded as the protection range of the utility model.

Claims

1. A small adapter for supplying high current, comprising an upper cover and a lower cover, wherein an independently rotatable circular rotating device is provided between the upper and lower covers, a conductive wire is wound inside the rotating device and fixed at one end, and the conductive wire extends and retracts as the rotating device rotates, characterized in that: Two conductive supports and a copper clad circuit board are arranged in the rotating device, the conductive supports are arranged on the copper clad circuit board and electrically connected, one end of the conductive wire is electrically connected with the copper clad circuit board, the conductive supports are symmetrically arranged with the rotating device as the axis, and the conductive supports are used for providing stable supporting force and dispersing current, so that the arc and heat risks caused by the current are reduced.

2. A compact adapter for supplying a large current according to claim 1, characterized in that: The copper clad circuit board is in a U-shaped structure, the conductive supports are arranged on two ends of the U-shaped structure respectively and symmetrically arranged with the rotating device as the axis, and a groove is arranged on the rotating device and the copper clad circuit board is arranged in the groove.

3. A compact adapter for supplying a large current according to claim 2, characterized in that: The conductive support comprises a plastic seat and a bow-shaped elastic piece, the plastic seat is fixedly arranged on the copper clad circuit board, one end of the bow-shaped elastic piece is welded with the copper clad circuit board, and the other end is suspended, the middle part of the bow-shaped elastic piece is in an arc shape and protrudes from the upper surface of the plastic seat.

4. A compact adapter for supplying a large current according to claim 3, characterized in that: The bow-shaped elastic piece is six.

5. A compact adapter for supplying a large current according to claim 4, characterized in that: An accommodation cavity is arranged on the inner side of the lower cover, an output circuit board is arranged in the accommodation cavity, the output circuit board is in a circular structure, six annular conductive rings are arranged on the side of the output circuit board facing the conductive support, the conductive rings are correspondingly contacted with the bow-shaped elastic piece, a rectangular conductive piece is extended from the edge of the output circuit board, and six conductive pins are arranged on the rectangular conductive piece and electrically connected with the conductive rings.

6. The compact adapter for supplying a large current according to claim 4, characterized in that: The distance between the upper surface of the plastic seat and the side corresponding to the output circuit board is 0.3-1.4mm.

7. A compact adapter for supplying a large current according to claim 5, characterized in that: The rotating device further comprises a rotating disc, the rotating disc is in a convex structure, the convex part is a snap ring, a coil spring is arranged in the snap ring, the middle part of the conductive wire is wound around the periphery of the snap ring, the center of the snap ring and the rotating disc is a through hole structure, and the edge of the snap ring is provided with a bayonet, the groove is arranged below the rotating disc, and a guide rail is arranged around the groove.

8. The compact adapter for supplying a large current according to claim 5, characterized in that: A rotating shaft and a buckle are arranged at the center of the inner side of the upper cover, the corresponding lower cover is provided with a shaft hole and a clamping groove, the rotating shaft is provided with a notch in the vertical direction, the rotating shaft passes through the through hole in the center of the snap ring, one end of the coil spring passes through the notch and is fixed on the rotating shaft, the other end of the coil spring is fixed on the bayonet, and the edge of the upper cover is further provided with an opening for the conductive wire to enter and exit.

9. The compact adapter for supplying a large current according to claim 5, characterized in that: A guide groove is arranged on the peripheral edge of the accommodation cavity, and a guide piece is arranged in the guide groove and correspondingly arranged with the guide rail.

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