Plug and socket with safety insurance

Abstract

The invention relates to the technical field of power supply safety insurance, in particular to a plug and a socket with safety insurance, one end face of a shell extends outwards to form a connecting wire, and the other end face of the shell is provided with a through hole for a power supply terminal to protrude; the PCB is arranged in the shell, and a first safety insurance circuit is arranged on the PCB; the end face of one end of the PCB protrudes to form the power supply terminal, and the power supply terminal is connected to the input end of the safety insurance circuit. The fuse is stacked on the PCB, and the fuse is connected to the first safety insurance circuit; the output end of the first safety insurance circuit is arranged along the connecting line, and the first safety insurance circuit is disconnected when the fuse detects that the circuit is short-circuited. The problem that an existing power socket can only achieve transmission of single current, power is supplied with the same current in different use states of a charged object, but the mode is difficult to meet the charging requirements in different use states is solved.

Description

Technical Field

[0001] The invention relates to the technical field of power supply safety fuses, in particular to a plug and a socket with safety fuses. Background Art

[0002] The connectors of general electronic products and the plugs of electrical appliances are called plugs. Household AC power plugs and sockets are male connectors with rod-shaped or copper-plate-shaped protrusions that are physically inserted into female connector-type power sockets with slots or holes.

[0003] Poor quality of plugs, sockets and converters is an important cause of electrical fires. The quality problems of small plugs, sockets and converters will pose a serious threat to the personal and property safety of consumers. Therefore, when consumers choose plugs, sockets, converters and switches, they should focus on the safety of the products. The main performance indicators that affect their safety are: marking, rating, size, protection against electric shock, structure, power cord, mechanical strength, heat resistance and flame resistance.

[0004] Existing power sockets can only transmit a single current, and the same current is used to supply power to the charging object in different usage states, but this method is difficult to meet the charging needs in different usage states; therefore, the present invention proposes a plug and socket with a safety fuse, which is provided with a safety fuse under the premise of switching between different currents, thereby improving the safety of the plug and socket. Summary of the invention

[0005] The invention is to provide a plug and socket with a safety fuse, which mainly solves the problem that the existing power socket can only realize the transmission of a single current and supply power with the same current under different usage conditions of the charging object, but this method is difficult to meet the charging needs under different usage conditions.

[0006] The present invention provides a plug with a safety fuse, comprising:

[0007] The housing has one end surface extending outwardly to form a connection line, and the other end surface is provided with a through hole for the power terminal to protrude;

[0008] A PCB board is built into the housing, and a first safety circuit is arranged on the PCB board; a power terminal is formed on a protrusion on one end surface of the PCB board, and the power terminal is connected to an input end of the safety circuit;

[0009] A fuse, stacked on the PCB board, and the fuse is connected to the first safety insurance circuit;

[0010] The output end of the first safety fuse circuit is arranged along the connecting line, and the first safety fuse circuit is disconnected when the fuse detects a circuit short circuit.

[0011] Preferably, it also includes:

[0012] A detection terminal, the protrusion of which is formed on the same end surface of the PCB board as the power terminal, and the detection terminal is connected to the input end of the first safety insurance circuit;

[0013] The detection terminal is used to detect whether the fast charging socket is connected. If so, the first safety insurance circuit is controlled to output a fast charging current. Otherwise, the first safety insurance circuit is controlled to output a slow charging current.

[0014] Preferably, the first safety circuit comprises:

[0015] The thermistor is used to detect the temperature of the PCB board and adjust the output current of the first safety circuit to adjust the output power when the temperature exceeds a threshold.

[0016] Preferably, the fuse and the power terminal are respectively arranged on both end surfaces of the PCB board;

[0017] The detection terminal is arranged to penetrate the PCB board, and the detection end of the detection terminal is arranged to protrude from one end surface of the PCB board.

[0018] Preferably, the PCB board comprises:

[0019] A slot, matched with the power terminal and the detection terminal;

[0020] A silk-screen circuit is connected to each of the slots, and the silk-screen circuit is arranged corresponding to the first safety insurance circuit.

[0021] Preferably, an end surface of the housing on which the connecting wire is formed and an end surface on which a through hole for the power terminal to protrude are adjacent end surfaces.

[0022] Preferably, the end surface of the housing on which the connecting wire is formed and the end surface on which the through hole for the power terminal to protrude are symmetrical end surfaces.

[0023] The present invention also proposes a socket with a safety fuse, adapted to the aforementioned plug, comprising:

[0024] The housing has a power slot on its upper end surface, and a fast-charging terminal is formed on the upper end surface protrusion;

[0025] A PCB board is built into the shell; a protrusion at one end surface of the PCB board forms the fast charging terminal and a power detection structure; a line segment formed by the power detection structure and the power slot is arranged perpendicular to the PCB board.

[0026] Preferably, the PCB board comprises:

[0027] There are three power detection structures, which are arranged in a triangle shape;

[0028] The fast charging terminal is arranged at the center of the power detection structure distributed in a herringbone shape.

[0029] Preferably, a second safety insurance circuit is arranged on the PCB board, and the fast charging terminal and the power supply detection structure are both connected to the second safety insurance circuit.

[0030] As can be seen from the above, the application of the technical solution provided by the present invention can achieve the following beneficial effects:

[0031] First, the plug proposed by the present invention adds a detection terminal and improves the first safety insurance circuit. The output path can be determined by the detection result of the detection terminal, and the output power can be changed, so that the plug can achieve current switching between fast charging and slow charging. At the same time, a fuse is also provided to provide safety protection for the plug during high power output;

[0032] Second, the plug proposed by the present invention is provided with a thermistor, which can provide protection for the plug by detecting the heat generated by the product, and control the decrease of the output power when the temperature is too high to reduce the heat generated;

[0033] Third, the socket proposed in the present invention is provided with a fast charging terminal and a second safety insurance circuit corresponding to the plug. The fast charging terminal and the detection terminal are connected to realize the rapid identification of the charging protocol, and then the output current and output power are adjusted in the second safety insurance circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0035] Figure 1 is a circuit diagram of a first safety circuit in a plug in Embodiment 1 of the present invention;

[0036] Figure 2 A schematic diagram of the structure of the plug in Embodiment 1 of the present invention;

[0037] Figure 3 This is a schematic diagram of the internal structure of the plug in Embodiment 1 of the present invention;

[0038] Figure 4 It is a partial structural schematic diagram of the plug in Embodiment 1 of the present invention;

[0039] Figure 5 is another structural schematic diagram of the plug in Embodiment 1 of the present invention;

[0040] Figure 6 is a schematic diagram of the structure of a socket in Embodiment 2 of the present invention;

[0041] Figure 7 This is a circuit diagram of the second safety circuit of the socket in Example 2 of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Existing power sockets can only transmit a single current, and supply power with the same current under different usage conditions of the charging object, but this method is difficult to meet the charging needs under different usage conditions.

[0044] Example 1

[0045] like Figure 1 to Figure 5 As shown, in order to solve the above problems, this embodiment proposes a plug with a safety fuse, including a shell 100, a PCB board 20 and a fuse 30; wherein, one end surface of the shell 100 extends outward to form a connecting line, and the other end surface is provided with a through hole for the power terminal 60 to protrude; the PCB board 20 is built into the shell 100, and a first safety fuse circuit is arranged on the PCB board 20; one end surface of the PCB board 20 is protruded to form a power terminal 60, and the power terminal 60 is connected to the input end of the safety fuse circuit; the fuse 30 is stacked on the PCB board 20, and the fuse 30 is connected to the first safety fuse circuit.

[0046] In this embodiment, the output end of the first safety circuit is arranged along the connecting line, and the first safety circuit is disconnected when the fuse 30 detects a circuit break.

[0047] Preferably, a detection terminal 40 is also included, which is protruded and formed on the same end surface of the PCB board 20 as the power terminal 60, and the detection terminal 40 is connected to the input end of the safety insurance circuit. In this embodiment, the detection terminal 40 is used to detect whether the fast charging socket is connected. If so, the fast charging circuit is turned on in the first safety insurance circuit and the current is output. If not, the slow charging circuit is turned on in the first safety insurance circuit and the slow charging current is output.

[0048] Preferably, but not limited to, in the first safety circuit of the present embodiment, as shown in the figure, the fast charging circuit is separated from the slow charging circuit, so that the fast charging current and the slow charging current are selectively conducted. Among them, the CC terminal is the detection terminal 40.

[0049] Preferably but not limited to, in this embodiment, the CC detection terminal 40 can also be used to detect other protocols.

[0050] Preferably, but not limited to, the fuse 30 disconnects when the circuit is broken to protect the device from being burned, and automatically resumes operation after cooling.

[0051] Preferably but not limited to, in this embodiment, the shell 100 adopts a flame-retardant PVC sheath with a temperature resistance of 105°C, and positioning grooves are provided at the outer symmetrical ends of the shell 100, and the positioning grooves are recessed in the shell 100 to facilitate gripping of the plug.

[0052] In this embodiment, a CC detection terminal 40 and a PTC fuse 30 are additionally provided on the plug, which can change the output current and output power of the plug, and monitor whether the circuit is short-circuited at the same time, and provide short-circuit protection measures for the plug in case of a short circuit, thereby improving the safety and functionality of the plug and making the plug of this embodiment adaptable to different usage conditions of the product.

[0053] More specifically, the safety circuit also includes a thermistor 50; the thermistor 50 is used to detect the temperature of the PCB board 20, and to adjust the output current of the first safety circuit to adjust the output power when the temperature exceeds a threshold.

[0054] Preferably, in this embodiment, the NTC thermistor 50 is arranged at Figure 1 In the safety fuse circuit shown.

[0055] In this embodiment, the NTC thermistor 50 is used to identify the heat generated by the product and set a protection temperature according to actual usage. When the temperature exceeds the identification temperature, the device automatically reduces power to achieve a protection function.

[0056] More specifically, the fuse 30 and the power terminal 60 are respectively disposed on both end surfaces of the PCB board 20 ; the CC detection terminal 40 penetrates the PCB board 20 , and the detection end of the CC detection terminal 40 protrudes from one end surface of the PCB board 20 .

[0057] Preferably, in this embodiment, there are three power terminals 60, which are distributed in a herringbone shape on one end surface of the PCB board 20; the CC detection terminal 40 is arranged at the center of the herringbone-shaped power terminal 60, and the height of the CC detection terminal 40 protruding from the current end surface of the PCB board 20 is much smaller than the height of the power terminal 60.

[0058] Preferably but not limited to, in this embodiment, the size of the PTC fuse 30 is smaller than the size of the PCB board 20, and it is arranged to abut the end surface of the PCB board 20; a pin end connected to the PCB board 20 is formed on the PTC fuse 30, and is connected to the first safety fuse circuit by soldering.

[0059] Preferably, in this embodiment, slots for matching the power supply terminals 60 and the detection terminals 40 are formed on the PCB board 20, and an adaptation circuit connecting each slot is also included, and the silk-screen circuit and the first safety insurance circuit are correspondingly arranged.

[0060] Preferably, but not limited to, in this embodiment, the NTC thermistor 50 is soldered and fixed to the end surface of the PCB board 20; a slot for the CC detection terminal 40 to pass through is formed at the center of the PCB board 20; slots for the power terminal 60 to be fixed are distributed in a triangular shape on the PCB board 20. Among them, the slot for the power terminal 60 to be fixed is square, and is arranged to avoid the shape of the end of the power terminal 60; the slot for the CC detection terminal 40 to pass through is circular.

[0061] Preferably but not limited to, the silk screen circuit in this embodiment is substantially the same as the first safety circuit, and adopts the most appropriate layout to ensure that the NTC thermistor 50, the PTC fuse 30 and the power terminal 60 and the CC detection terminal 40 do not affect each other in structure, but can complete the actual function of the first safety circuit.

[0062] In this embodiment, the PCB board 20 can be fixed in position in the housing 100 by external fasteners, etc. On the premise of maintaining the position, the transmission of electrical signals and the realization of various functions are achieved through various components fixed thereon by soldering.

[0063] More specifically, the end face of the shell 100 on which the connecting wire is formed and the end face of the through hole through which the power supply terminal 60 protrudes are adjacent end faces, or the end face of the shell 100 on which the connecting wire is formed and the end face of the through hole through which the power supply terminal 60 protrudes are symmetrical end faces.

[0064] In this embodiment, the power plug can be a 180° straight plug or a 90° bent plug, and the layout of the PCB board 20 is adjusted accordingly to ensure that the output end of the first safety insurance circuit and the connecting line on the housing 100 are located on the same side.

[0065] Example 2

[0066] like Figure 6As shown, in order to solve the aforementioned problems, the present embodiment proposes a socket with a safety fuse, which is used to adapt to the plug of Example 1, and includes a shell 200 and a PCB board; wherein, a power slot 70 is opened on the upper end face of the shell 200, and a fast charging terminal 80 is formed on the upper end face; the PCB board is built into the shell 200, and one end face of the PCB board is protruded to form a fast charging terminal 80 and a power detection structure; the line segment formed by the power detection structure and the power slot 70 is arranged perpendicular to the PCB board.

[0067] Preferably, in this embodiment, the power slot 70 on the housing 200 is arranged in alignment with the power detection structure, that is, when the power terminal on the plug enters the power slot 70, it will enter the detection range of the power detection structure.

[0068] Preferably, in the present embodiment, there are three power slots 70 , which are distributed in a herringbone shape; the fast charging terminal 80 is disposed at the center of the herringbone-shaped power slots 70 .

[0069] Preferably, in this embodiment, the output end area of ​​the fast charging terminal 80 is smaller than the detection end area of ​​the CC detection terminal to facilitate accurate detection of the CC detection terminal.

[0070] Preferably, the power detection structure in this embodiment is a clamping structure, that is, after the power terminal enters the power slot 70, it falls centrally into the clamping range of the power detection structure and maintains contact with the power detection structure during the continuous entry of the power terminal.

[0071] Preferably, in this embodiment, the power detection result and the fast charging terminal 80 should be arranged on the same fixed conductive structure, so that the electrical signals between points on the same fixed conductive structure can be transmitted and detected.

[0072] In this embodiment, a second safety circuit is provided on the PCB board, such as Figure 7 As shown, the CC end is a fast charging terminal 80. When the CC fast charging terminal 80 detects the corresponding detection terminal 40, the chip 10 pin is set to a high level and outputs a high-power current. When the CC fast charging terminal 80 does not detect the corresponding detection terminal 40, the chip 10 pin is vacant and outputs a low-power current, which can be specifically set through the chip protocol.

[0073] To sum up, the socket with a safety fuse proposed in this embodiment is provided with a fast charging terminal matching the plug, which is used to distinguish it from an ordinary slow charging socket, so that the plug described in Example 1 can quickly detect and determine whether a fast charging protocol exists, and then when used in combination with Example 1, it can realize automatic judgment and switching of fast charging and slow charging currents, and its detection process is relatively simple and accurate.

[0074] The above-mentioned implementation modes do not constitute a limitation on the protection scope of the technical solution. Any modification, equivalent replacement and improvement made within the spirit and principle of the above-mentioned implementation modes shall be included in the protection scope of the technical solution.

Claims

1. A plug with a safety fuse, characterized in that: include: The housing has one end surface extending outwardly to form a connection line, and the other end surface is provided with a through hole for the power terminal to protrude; A PCB board is built into the housing, and a first safety circuit is arranged on the PCB board; a power terminal is formed on a protrusion on one end surface of the PCB board, and the power terminal is connected to an input end of the safety circuit; A fuse is stacked on the PCB board and connected to the first safety circuit; The output end of the first safety fuse circuit is arranged along the connecting line, and the first safety fuse circuit is disconnected when the fuse detects a circuit short circuit.

2. A plug with a safety fuse according to claim 1, characterized in that: Also includes: A detection terminal, the protrusion of which is formed on the same end surface of the PCB board as the power terminal, and the detection terminal is connected to the input end of the first safety insurance circuit; The detection terminal is used to detect whether the fast charging socket is connected. If so, the first safety insurance circuit is controlled to output a fast charging current. Otherwise, the first safety insurance circuit is controlled to output a slow charging current.

3. A plug with a safety fuse according to claim 2, characterized in that: The first safety insurance circuit comprises: The thermistor is used to detect the temperature of the PCB board and adjust the output current of the first safety circuit to adjust the output power when the temperature exceeds a threshold.

4. A plug with a safety fuse according to claim 3, characterized in that: The fuse and the power supply terminal are respectively arranged on the end surfaces at both ends of the PCB board; The detection terminal is arranged to penetrate the PCB board, and the detection end of the detection terminal is arranged to protrude from one end surface of the PCB board.

5. A plug with a safety fuse according to claim 4, characterized in that: The PCB board comprises: A slot, matched with the power terminal and the detection terminal; A silk-screen circuit is connected to each of the slots, and the silk-screen circuit is arranged corresponding to the first safety insurance circuit.

6. A plug with a safety fuse according to any one of claims 1 to 5, characterized in that: The end surface of the housing on which the connecting wire is formed and the end surface on which the through hole for the power terminal to protrude are adjacent end surfaces.

7. A plug with a safety fuse according to any one of claims 1 to 5, characterized in that: The end surface of the housing on which the connecting wire is formed and the end surface on which the through hole for the power terminal to protrude are symmetrical end surfaces.

8. A socket with a safety fuse, adapted to fit the plug according to any one of claims 1 to 7, characterized in that: include: The housing has a power slot on its upper end surface, and a fast-charging terminal is formed on the upper end surface protrusion; A PCB board, built into the housing; One end surface of the PCB board is raised to form the fast charging terminal and the power detection structure; the line segment formed by the power detection structure and the power slot is arranged perpendicular to the PCB board.

9. A socket with safety fuse according to claim 8, characterized in that: The PCB board comprises: There are three power detection structures, which are arranged in a triangle shape; The fast charging terminal is arranged at the center of the power detection structure distributed in a herringbone shape.

10. A socket with a safety fuse according to claim 8 or 9, characterized in that: A second safety circuit is arranged on the PCB board, and the fast charging terminal and the power detection structure are both connected to the second safety circuit.

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