Detection and protection device for power cord, and electrical connection apparatus

Abstract

Disclosed in the present application are a detection and protection device for a power cord (100), and an electrical connection apparatus. The detection and protection device comprises a housing assembly (200), a test button (211), power plug blades (221), a circuit board (300) and a support frame (400), wherein the housing assembly (200) comprises a first housing (210) and a second housing (220); the test button (211) is arranged on the first housing (210); the second housing (220) is provided with a plurality of plug blades holes, and the power plug blades (221) extend at one end from the plug blade holes into the housing assembly (200); the circuit board (300) is arranged inside the housing assembly (200), the circuit board (300) comprises a first board surface (310) facing the first housing (210) and a second board surface (320) facing the second housing (220), a first contact point (311) and a second contact point (312) are printed on the first board surface (310), and when the test button (211) is pressed, the first contact point (311) is electrically connected to the second contact point (312); the support frame (400) is located between the circuit board (300) and the second housing (220); and the power cord (100) comprises a current-carrying wire, a current-carrying conductor (500) and a trip switch (600) are provided on the support frame (400), and the current-carrying conductor (500) is connected to the current-carrying wire by means of welding.

Description

Power cord detection and protection devices and electrical connection equipment

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202422660396.4, filed on October 31, 2024, entitled "Power Line Detection and Protection Device and Electrical Connection Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of electrical equipment technology, and in particular to a power cord detection and protection device and an electrical connection device. Background Technology

[0004] A leakage circuit breaker (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power supply line via a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have not only needed to detect leakage current in the power supply line via the leakage current detection lead, but also have higher safety detection requirements, such as detecting whether the leakage current detection lead is open-circuited.

[0005] Currently, as the safety testing requirements for power cord detection and protection devices are increasing, the number of components in the circuit modules of these devices is also increasing. As a result, the structural design of these devices faces more and more challenges, such as interference from the large operating current supplied to the load on the detection and protection circuit, and unreliable touch pressure of the test buttons. Summary of the Invention

[0006] The purpose of this application is to at least partially solve one of the technical problems existing in the prior art, and to this end, to provide a power cord detection and protection device and an electrical connection device.

[0007] In a first aspect, embodiments of this application provide a power cord detection and protection device, including a housing assembly, a test button, a power connector, a circuit board, and a support frame, wherein:

[0008] The housing assembly includes a first housing and a second housing, and the power cord extends from the connection between the first housing and the second housing into the interior of the housing assembly;

[0009] The test button is located on the first housing;

[0010] The second housing is provided with a plurality of insert holes, and one end of the power plug extends from the insert hole into the housing assembly;

[0011] The circuit board is disposed inside the housing assembly and electrically connected to the power line. The circuit board includes a first surface facing the first housing and a second surface facing the second housing. A detection and protection circuit is printed on the first surface. The detection and protection circuit includes a first contact point and a second contact point. When the test button is pressed, the first contact point and the second contact point are electrically connected.

[0012] The support frame is located between the circuit board and the second housing and is fixed on the second plate. The power line includes a current-carrying wire. The support frame is provided with a current-carrying conductor and a trip switch. The current-carrying conductor is welded to the current-carrying wire. The trip switch is used to control the power connection between the current-carrying conductor and the power plug.

[0013] According to the embodiments of this application, the power cord detection and protection device provides the following: When the detection and protection device is powered on and supplies power to the load through the power cord, the electrical connection between the power plug and the current-carrying conductor is established. The large operating current flows from the power plug to the current-carrying conductor, and then to the current-carrying line of the power cord. Inside the detection and protection device, both the power plug and the current-carrying conductor are located on the side close to the second housing. The detection and protection circuit on the circuit board is printed on the first board surface facing the first housing, that is, the detection and protection circuit is printed on the board surface away from the large operating current. Furthermore, the second board surface of the circuit board is also provided with a support frame, which further increases the distance between the large operating current and the detection and protection circuit, greatly reducing the interference of the large operating current on the detection and protection circuit. The test button is located in the first housing, and the first board surface of the circuit board with the detection and protection circuit is facing the first housing, so that the test button and the detection and protection circuit are positioned opposite each other. When the test button is pressed, the stroke required to achieve electrical connection between the first contact point and the second contact point in the detection and protection circuit can also be set to be shorter, which helps to improve the contact reliability of the test button.

[0014] According to some embodiments of the present application, the detection and protection device is provided on the first housing, and the reset button is adjacent to the test button. The circuit board is provided with a first through hole corresponding to the reset button. One end of the reset button passes through the first through hole and abuts against the trip switch. When the reset button is pressed, the trip switch conducts the power connection between the current-carrying conductor and the power plug.

[0015] According to some embodiments of the present application, the detection protection device has a raised enclosure surrounding the test button and the reset button on the first housing, and the height of the raised enclosure is greater than or equal to the height of the test button and the reset button.

[0016] According to some embodiments of this application, the detection protection device includes a light-emitting diode, a second through hole corresponding to the light-emitting diode is provided on the first housing, and a light guide post is provided on the second through hole.

[0017] According to some embodiments of the present application, the detection and protection device is provided with a first through-hole pad for welding the current-carrying conductor on the circuit board, and a third through-hole corresponding to the first through-hole pad is also provided on the support frame.

[0018] According to some embodiments of the present application, the detection and protection device is further provided on the support frame with a trip coil for generating electromagnetic force to drive the trip switch to disconnect the power connection, and the circuit board is provided with a second through-hole pad for soldering the trip coil.

[0019] The detection and protection device provided according to some embodiments of this application further includes a first varistor for absorbing surge voltage. The support frame is provided with a first mounting part for mounting the first varistor. The first mounting part is provided with a first mounting hole and a second mounting hole for the two pins of the first varistor to pass through respectively. An isolation part for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

[0020] According to some embodiments of the present application, the detection protection device includes a first stop near the first mounting hole and a second stop near the second mounting hole.

[0021] According to some embodiments of the present application, a detection protection device is provided in which a concave region is formed between the first block and the second block.

[0022] According to some embodiments of the present application, the detection and protection device is made of insulating material, and the first stop and the second stop are integrally formed on the support frame.

[0023] Secondly, embodiments of this application provide an electrical connection device, including a detection and protection device as described in the first aspect embodiment above and a power line connected to the detection and protection device, wherein the detection and protection device supplies power to the electrical load through the power line.

[0024] Other features and advantages of this application will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the description, claims and drawings. Attached Figure Description

[0025] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0026] The embodiments of this application will be further described below with reference to the accompanying drawings and examples;

[0027] Figure 1 is a schematic diagram of the overall structure of the power line detection and protection device provided in an embodiment of this application;

[0028] Figure 2 is a schematic diagram of the overall structure of the power line detection and protection device provided in an embodiment of this application from another angle;

[0029] Figure 3 is a schematic diagram of the circuit board and support frame of the power line detection and protection device provided in an embodiment of this application;

[0030] Figure 4 is a schematic diagram of the layout of the detection and protection circuit printed on the first board surface in the power line detection and protection device provided in the embodiment of this application.

[0031] Figure 5 is a schematic diagram of the circuit board and support frame of a power cord detection and protection device provided in another embodiment of this application;

[0032] Figure 6 is a circuit diagram of the power line detection and protection device, including the power line, self-test current injection module, and manual detection module, provided in an embodiment of this application.

[0033] Figure 7 is a circuit diagram of the fault response module of the power line detection and protection device provided in an embodiment of this application;

[0034] Figure 8 is a circuit diagram of the trigger module and other components of the power line detection and protection device provided in an embodiment of this application. Detailed Implementation

[0035] This section will describe in detail the specific embodiments of this application. Preferred embodiments of this application are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of this application, but they should not be construed as limiting the scope of protection of this application.

[0036] In the description of the embodiments of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. "At least one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0037] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this application in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0038] It should be noted that the technical features involved in the various embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0039] A leakage circuit detector (LCDI) is a power connection device for electrical appliances. It detects leakage current in power lines using a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have faced increasingly stringent safety requirements beyond simply detecting leakage current in power lines. For example, they need to detect whether the leakage current detection lead is open-circuited. Currently, as the safety requirements for power line detection and protection devices become more stringent, the number of components in the circuit modules of these devices is also increasing. Therefore, the structural design of these devices faces growing challenges, such as interference from high operating currents supplied to the load and unreliable test button operation.

[0040] Based on this, embodiments of this application provide a power cord detection and protection device and an electrical connection device, which can reduce interference to the detection and protection circuit and improve the reliability of the test button's touch.

[0041] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0042] Figure 1 is a schematic diagram of the overall structure of the power cord detection and protection device provided in an embodiment of this application; Figure 2 is a schematic diagram of the overall structure of the power cord detection and protection device provided in an embodiment of this application from another angle; Figure 3 is a schematic diagram of the circuit board and support frame of the power cord detection and protection device provided in an embodiment of this application; Figure 4 is a schematic diagram of the layout of the detection and protection circuit printed on the first board surface of the circuit board in the power cord detection and protection device provided in an embodiment of this application. Referring to Figures 1 to 4, a first aspect embodiment of this application provides a detection and protection device for a power cord 100, including a housing assembly 200, a test button 211, a power plug 221, a circuit board 300, and a support frame 400, wherein:

[0043] As shown in Figures 1 and 2, the housing assembly 200 includes a first housing 210 and a second housing 220, and the power cord 100 extends from the connection between the first housing 210 and the second housing 220 into the interior of the housing assembly 200.

[0044] Referring to Figure 1, the test button 211 is disposed on the first housing 210;

[0045] Referring to Figure 2, the second housing 220 is provided with a plurality of insert holes, and one end of the power insert 221 extends from the insert hole into the housing assembly 200; specifically, there may be three power inserts 221, corresponding to the live wire, neutral wire and ground wire respectively;

[0046] The circuit board 300 is disposed inside the housing assembly 200 and electrically connected to the power line 100. The circuit board 300 includes a first plate surface 310 facing the first housing 210 and a second plate surface 320 facing the second housing 220. A detection protection circuit is printed on the first plate surface 310. Specifically, as shown in FIG4, the detection protection circuit includes a first touch point 311 and a second touch point 312. When the test button 211 is pressed, the first touch point 311 and the second touch point 312 are electrically connected.

[0047] The support frame 400 is located between the circuit board 300 and the second housing 220 and is fixed on the second plate surface 320, for example, as shown in FIG3;

[0048] The power cord 100 includes current-carrying wires, such as a first current-carrying wire as a live wire and a second current-carrying wire as a neutral wire. The support frame 400 is provided with a current-carrying conductor 500 and a trip switch 600. The current-carrying conductor 500 is soldered to the current-carrying wire, as shown in Figure 3. There can be two current-carrying conductors 500, one of which is soldered to the first current-carrying wire as a live wire, and the other current-carrying conductor 500 is soldered to the second current-carrying wire as a neutral wire. The trip switch 600 is used to control the power connection between the current-carrying conductor 500 and the power plug 221.

[0049] According to the embodiments of this application, the power line 100 detection and protection device is powered on and supplies power to the load through the power line 100. When the detection and protection device is powered on, the power connection between the power plug 221 and the current-carrying conductor 500 is made conductive. The large operating current flows from the power plug 221 to the current-carrying conductor 500, and then to the current-carrying line of the power line 100. Inside the detection and protection device, the power plug 221 and the current-carrying conductor 500 are both located on the side close to the second housing 220. The detection and protection circuit on the circuit board 300 is printed on the first board surface 310 facing the first housing 210, that is, the detection and protection circuit is printed on the board surface of the circuit board 300 away from the large operating current. Furthermore, the second surface 320 of the circuit board 300 is also provided with a support frame 400, which further increases the distance between the high current operating circuit and the detection and protection circuit, greatly reducing the interference of the high current operating circuit on the detection and protection circuit. The test button 211 is located in the first housing 210, and the first surface 310 of the circuit board 300 with the detection and protection circuit printed on it faces the first housing 210, so that the test button 211 and the detection and protection circuit are positioned opposite each other. The stroke required for the first contact point 311 and the second contact point 312 in the detection and protection circuit to be electrically connected by pressing the test button 211 can also be set to be shorter, which helps to improve the contact reliability of the test button 211.

[0050] Referring to FIG1, in the detection protection device provided in some embodiments of this application, a reset button 212 is also provided on the first housing 210. The reset button 212 is adjacent to the test button 211. Referring to FIG4, a first through hole 301 corresponding to the reset button 212 is provided on the circuit board 300. One end of the reset button 212 passes through the first through hole 301 and abuts against the trip switch 600. When the reset button 212 is pressed, the trip switch 600 conducts the power connection between the current-carrying conductor 500 and the power plug 221.

[0051] In this embodiment, the reset button 212 and the test button 211 on the first housing 210 are arranged in adjacent positions, which facilitates the simultaneous assembly of the reset button 212 and the test button 211 during the production of the protection device, thereby improving production efficiency. In addition, the reset button 212 and the test button 211 can be set as an integrated button assembly, thereby reducing the number of components and the assembly complexity of the protection device. The circuit board 300 is provided with a first through hole 301 for the reset button 212 to pass through, so that the reset button 212 can directly push the trip switch 600.

[0052] Referring to FIG1, in the detection protection device provided in some embodiments of this application, a raised enclosure 213 surrounding the test button 211 and the reset button 212 is provided on the first housing 210, and the height of the raised enclosure 213 is greater than or equal to the height of the test button 211 and the reset button 212.

[0053] In this embodiment, a raised barrier 213 is provided. When an object is accidentally thrown onto the first housing 210 of the detection protection device, the possibility of the detection protection device being accidentally powered on or off due to accidental contact with the test button 211 and reset button 212 is effectively reduced, greatly improving the safety of the detection protection device.

[0054] Referring to FIG4, in the detection protection device provided in some embodiments of this application, the detection protection circuit includes a light-emitting diode LED1, and referring to FIG1, a second through hole 214 corresponding to the light-emitting diode LED1 is provided on the first housing 210, and a light guide post is provided on the second through hole 214.

[0055] In this embodiment, when the light-emitting diode LED1 on the circuit board 300 is powered on, the emitted light is transmitted through the light guide post from the second through hole 214 so that the user can see it intuitively.

[0056] Referring to FIG4, in the detection and protection device provided in some embodiments of this application, the circuit board 300 is provided with a first through hole pad 302 and a first through hole pad 303 for soldering the current-carrying conductor 500, and the support frame 400 is also provided with a third through hole corresponding to the first through hole pad 302 and the first through hole pad 303.

[0057] Since the detection and protection circuit on the circuit board 300 needs to be electrically connected to the current-carrying conductor 500 to form a loop, pads for soldering the current-carrying conductor 500 need to be provided on the circuit board 300. Since the detection and protection circuit is printed on the first board surface 310 of the circuit board 300 away from the support frame 400, rather than on the second board surface 320 where the circuit board 300 and the support frame 400 are connected, through-hole pads need to be provided on the circuit board 300. Correspondingly, the support frame 400 is also provided with a third through hole so that a part of the current-carrying conductor 500 can first pass through the third through hole on the support frame 400 and then through the through-hole pad on the circuit board 300, thereby realizing the electrical connection between the current-carrying conductor 500 and the detection and protection circuit.

[0058] Referring to FIG3, in the detection and protection device provided in some embodiments of this application, the support frame 400 is further provided with a trip coil Lx for generating electromagnetic force to drive the trip switch 600 to disconnect the power connection, and referring to FIG4, the circuit board 300 is provided with a second through hole pad 304 and a second through hole pad 305 for soldering the trip coil Lx.

[0059] Similarly, in this embodiment, since the detection protection circuit is printed on the first surface 310 of the circuit board 300 away from the support frame 400, rather than on the second surface 320 where the circuit board 300 is connected to the support frame 400, the circuit board 300 needs to be provided with a second through-hole pad 304 and a second through-hole pad 305 so that the two pins of the trip coil Lx can pass through the through-hole pads on the circuit board 300, thereby realizing the electrical connection between the trip coil Lx and the detection protection circuit.

[0060] Referring to Figure 5, the detection and protection device provided in some embodiments of this application further includes a first varistor ZR1 for absorbing surge voltage. A first mounting portion 410 for mounting the first varistor ZR1 is provided on the support frame 400. The first mounting portion 410 has a first mounting hole 411 and a second mounting hole 412 through which the two leads of the first varistor ZR1 pass, respectively. An isolation portion 413 for increasing creepage distance is provided between the first mounting hole 411 and the second mounting hole 412. A third through-hole pad 306 and a third through-hole pad 307 are provided on the circuit board 300 for soldering the two leads of the first varistor ZR1, respectively. When the support frame 400 is mounted on the circuit board 300, the first mounting hole 411 corresponds to the third through-hole pad 306, and the second mounting hole 412 corresponds to the third through-hole pad 307.

[0061] In this embodiment, by setting the position of the first mounting hole 411 on the support frame 400 to correspond to the position of the third through-hole pad 306 on the circuit board 300, and setting the position of the second mounting hole 412 on the support frame 400 to correspond to the position of the third through-hole pad 307 on the circuit board 300, it is possible to achieve that after the support frame 400 is fixed to the circuit board 300, the two pins of the first varistor ZR1 are directly aligned with the third through-hole pad 306 and the third through-hole pad 307 respectively. This allows for convenient pin soldering of the first varistor ZR1. Moreover, with the auxiliary positioning effect of the support frame 400, the first varistor ZR1 is less prone to displacement during the soldering process, which helps to improve the reliability and efficiency of pin soldering of the first varistor ZR1.

[0062] Referring to FIG5, in the detection protection device provided in some embodiments of this application, the isolation part 413 includes a first stop 4131 near the first mounting hole 411 and a second stop 4132 near the second mounting hole 412.

[0063] In this embodiment, by setting two blocks respectively to form an isolation part 413, the creepage distance between the first mounting hole 411 and the second mounting hole 412 needs to bypass the first block 4131 and the second block 4132 respectively, thereby greatly improving the creepage distance between the two pins of the first varistor ZR1 and improving the safety of the circuit board.

[0064] Referring to FIG5, in the detection protection device provided in some embodiments of this application, the first block 4131 and the second block 4132 extend in a direction away from the circuit board 300, that is, extend in the height direction of the angle shown in FIG2.

[0065] In this embodiment, both the first block 4131 and the second block 4132 extend in a direction away from the circuit board 300. That is, the first block 4131 and the second block 4132 have a certain height, which avoids the inability to effectively isolate the pins when the exposed conductive metal of the two pins of the first varistor ZR1 is long, thus improving the isolation reliability of the isolation part 413.

[0066] Referring to FIG5, in the detection protection device provided in some embodiments of this application, a concave region 414 is formed between the first stop 4131 and the second stop 4132.

[0067] In this embodiment, the presence of the recessed region 414 requires the creepage distance between the first mounting hole 411 and the second mounting hole 412 to bypass the surface of the recessed region 414, thereby effectively increasing the creepage distance and improving the safety of the circuit board.

[0068] Referring to FIG5, in the varistor mounting structure provided in some embodiments of this application, the first stop 4131 is arc-shaped and is disposed around the edge of the first mounting hole 411 near the edge of the second mounting hole 412; the second stop 4132 is arc-shaped and is disposed around the edge of the second mounting hole 412 near the edge of the first mounting hole 411.

[0069] In this embodiment, the first stop 4131 and the second stop 4132 are both arc-shaped and are respectively arranged around the edges of the first mounting hole 411 and the second mounting hole 412, which can effectively isolate the first mounting hole 411 and the second mounting hole 412.

[0070] Referring to FIG5, in the detection and protection device provided in some embodiments of this application, the support frame 400 is made of insulating material, and the first stop 4131 and the second stop 4132 are integrally formed on the support frame 400.

[0071] In this embodiment, the first stop 4131 and the second stop 4132 are integrally formed on the support frame 400. Compared with the structure of forming them separately and then assembling them together, the rigidity of the first stop 4131 and the second stop 4132 can be improved, and the first stop 4131 and the second stop 4132 can be prevented from easily deforming and falling off due to long-term pressure from the pin of the first varistor ZR1, thus avoiding potential hazards.

[0072] Referring to Figures 6 to 8, the power line 100 includes a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor structure 130 covering the first current-carrying line 110, and a second shielding conductor structure 140 covering the second current-carrying line 120. The first shielding conductor structure 130 is used to collect the leakage current signal of the first current-carrying line 110, and the second shielding conductor structure 140 is used to collect the leakage current signal of the second current-carrying line 120. The first shielding conductor structure 130 includes a first end a near the input end of the power line 100 and a second end b near the output end of the power line 100. The second shielding conductor structure 140 includes a third end c near the input end of the power line 100 and a fourth end d near the output end of the power line 100. The second end b and the fourth end d are connected.

[0073] The detection and protection circuit in the detection and protection device includes a self-test current injection module 330, a manual detection module 340, a fault response module 350, and a trigger module 360. The self-test current injection module 330 is used to inject a self-test current into the second shielded conductor structure 140. The manual detection module 340 is used to inject a simulated leakage current into the first shielded conductor structure 130. The fault response module 350 is used to output a trip trigger signal when any one of the following is obtained: a leakage signal detected by the first shielded conductor structure 130, a leakage signal detected by the second shielded conductor structure 140, an open circuit signal generated when the first shielded conductor structure 130 or the second shielded conductor structure 140 is open, or a simulated leakage current injected by the manual detection module 340 is obtained. The trigger module 360 ​​is used to disconnect the power connection between the input and output terminals of the power supply line 100 according to the received trip trigger signal.

[0074] Referring to Figure 4, the circuit board 300 is also provided with a fourth through hole pad 308 for soldering the first shielding conductor structure 130 and a fourth through hole pad 309 for soldering the second shielding conductor structure 140.

[0075] Referring again to Figures 6 to 8, the manual detection module 340 includes a test switch TEST and a first resistor R1. One end of the test switch TEST is connected to the first current-carrying line 110, and the other end of the test switch TEST is connected to one end of the first resistor R1. The other end of the first resistor R1 is connected to the first terminal a of the first shielding conductor structure 130. The self-test current injection module 330 includes a second resistor R2. One end of the second resistor R2 is connected to the first current-carrying line 110, and the other end of the second resistor R2 is connected to the third terminal c of the second shielding conductor structure 140. Detection protection device. It also includes a first diode D1, the anode of which is connected to the trigger module 360, and the cathode of which is connected to the first current-carrying line 110; the detection and protection device also includes a third resistor R3, one end of which is connected to the first terminal a of the first shielding conductor structure 130, and the other end of which is connected to the fault response module 350 and the trigger module 360; the fault response module 350 includes a fourth resistor R4, a first capacitor C1, and a Zener diode ZD1, one end of the fourth resistor R4, one end of the first capacitor C1, and one end of the Zener diode ZD1. The fourth resistor R4 is connected together, with the other end connected to the third terminal c of the second shielded conductor structure 140. The other ends of the first capacitor C1 and the Zener diode ZD1 are both connected to the trigger module 360. The trigger module 360 ​​includes a fifth resistor R5, a second capacitor C2, and a thyristor Q1. One end of the fifth resistor R5, one end of the second capacitor C2, and the cathode of the thyristor Q1 are all connected to the positive terminal of the first diode D1. The other ends of the fifth resistor R5, the other end of the second capacitor C2, and the control pin of the thyristor Q1 are connected together and connected to the fault response module 350. One end of the trip coil Lx is connected to the second current-carrying line 120, and the other end of the trip coil Lx is connected to the anode of the silicon controlled rectifier Q1. The circuit also includes a second varistor ZR2 and a second diode D2, both connected in parallel with the silicon controlled rectifier Q1. Furthermore, it includes an indicator module, which comprises a sixth resistor R6 and a light-emitting diode LED1. One end of the sixth resistor R6 is connected to the trip coil Lx, and the other end is connected to the anode of the light-emitting diode LED1. The cathode of the light-emitting diode LED1 is connected to the anode of the first diode D1. The positions of the various components of the detection and protection circuit on the circuit board 300 are shown in Figure 4.

[0076] Secondly, embodiments of this application provide an electrical connection device, including a detection and protection device as described in the first aspect embodiment above and a power cord 100 connected to the detection and protection device, wherein the detection and protection device supplies power to the electrical load through the power cord 100.

[0077] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which may include computer storage media or non-transitory media and communication media or transient media. As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information such as computer-readable instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc DVD or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0078] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A power cord detection and protection device, comprising: A housing assembly includes a first housing and a second housing, wherein the power cord extends from the connection between the first housing and the second housing into the interior of the housing assembly; A test button is located on the first housing; The power connector has a plurality of connector holes in the second housing, and one end of the power connector extends from the connector holes into the housing assembly. A circuit board is disposed inside the housing assembly and electrically connected to the power line. The circuit board includes a first plate surface facing the first housing and a second plate surface facing the second housing. A detection and protection circuit is printed on the first plate surface. The detection and protection circuit includes a first contact point and a second contact point. When the test button is pressed, the first contact point and the second contact point are electrically connected. as well as A support frame is located between the circuit board and the second housing and is fixed to the second plate. The power cord includes a current-carrying wire. The support frame is provided with a current-carrying conductor and a trip switch. The current-carrying conductor is soldered to the current-carrying wire. The trip switch is used to control the power connection between the current-carrying conductor and the power plug.

2. The detection and protection device according to claim 1, wherein, The first housing is also provided with a reset button, which is adjacent to the test button. The circuit board is provided with a first through hole corresponding to the reset button. One end of the reset button passes through the first through hole and abuts against the trip switch. When the reset button is pressed, the trip switch conducts the power connection between the current-carrying conductor and the power plug.

3. The detection and protection device according to claim 2, wherein, The first housing is provided with a raised enclosure surrounding the test button and the reset button, the height of the raised enclosure being greater than or equal to the height of the test button and the reset button.

4. The detection and protection device according to any one of claims 1 to 3, wherein, The detection and protection circuit includes a light-emitting diode, and a second through hole corresponding to the light-emitting diode is provided on the first housing, and a light guide post is provided on the second through hole.

5. The detection and protection device according to any one of claims 1 to 4, wherein, The circuit board is provided with a first through-hole pad for soldering the current-carrying conductor, and the support frame is also provided with a third through-hole corresponding to the first through-hole pad.

6. The detection and protection device according to any one of claims 1 to 5, wherein, The support frame is also provided with a trip coil for generating electromagnetic force to drive the trip switch to disconnect the power connection, and the circuit board is provided with a second through-hole pad for soldering the trip coil.

7. The detection and protection device according to any one of claims 1 to 6 further includes a first varistor for absorbing surge voltage, wherein the support frame is provided with a first mounting portion for mounting the first varistor, the first mounting portion is provided with a first mounting hole and a second mounting hole for the two pins of the first varistor to pass through respectively, and an isolation portion for increasing the creepage distance is provided between the first mounting hole and the second mounting hole.

8. The detection and protection device according to claim 7, wherein, The isolation section includes a first stop near the first mounting hole and a second stop near the second mounting hole.

9. The detection and protection device according to claim 8, wherein, A concave region is formed between the first stop block and the second stop block.

10. The detection and protection device according to claim 8 or 9, wherein, The support frame is made of insulating material, and the first stop and the second stop are integrally formed on the support frame.

11. An electrical connection device comprising a detection and protection device as described in any one of claims 1 to 10 and a power line connected to the detection and protection device, wherein the detection and protection device supplies power to an electrical load through the power line.

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