Circuit board of electrical connection device, and electrical connection device

Abstract

The present application discloses a circuit board of an electrical connection device, and an electrical connection device. The electrical connection device comprises a power supply line (100), and a detection and protection apparatus provided on the circuit board and electrically connected to the power supply line (100). The detection and protection apparatus comprises a self-test current injection module (210), a manual detection module (220), a fault response module (230), and a trigger module (240). The circuit board comprises a middle region (B50), a first region (B10), a second region (B20), a third region (B30), and a fourth region (B40). The first region (B10) is provided with pads for soldering a first current-carrying wire (110), a second current-carrying wire (120), a first shielding conductor structure (130) and a second shielding conductor structure (140). The self-test current injection module (210) and the manual detection module (220) are disposed in the middle region (B50) of the circuit board.

Description

Circuit boards and electrical connection devices for electrical connection equipment

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent applications filed on October 31, 2024, with application number 202422660412.X entitled "Circuit Board and Electrical Connection Device for Electrical Connection Device" and filed on March 21, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of circuit board technology, and more particularly to a circuit board 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, with the increasing demand for safety testing of power cord detection and protection devices, the number of components in the circuit modules included in these devices is also increasing. As a result, the circuit board layout of electrical connection equipment is facing more and more challenges, such as difficulties in circuit board routing, the need for winding, the susceptibility of electrical signals transmitted on the circuit board to interference, and the need for larger board sizes. 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 provide a circuit board and electrical connection device for an electrical connection device, which can improve the space utilization of the circuit board, reduce the size of the circuit board, reduce the difficulty of wiring, and reduce the interference of electrical signals transmitted on the circuit board.

[0007] In a first aspect, embodiments of this application provide a circuit board for an electrical connection device, the electrical connection device including a power cord and a detection and protection device disposed on the circuit board and electrically connected to the power cord;

[0008] The power line includes a first current-carrying line, a second current-carrying line, a first shielding conductor structure covering the first current-carrying line, and a second shielding conductor structure covering the second current-carrying line. The first shielding conductor structure is connected to the second shielding conductor structure.

[0009] The detection and protection device includes a self-test current injection module, a manual detection module, a fault response module, and a trigger module;

[0010] The circuit board includes a central region, a first region, a second region, a third region opposite to the first region, and a fourth region opposite to the second region. The second region is connected to one side of the first region and the third region, and the fourth region is connected to the other side of the first region and the third region. The central region is surrounded by the first region, the second region, the third region, and the fourth region.

[0011] The first region is provided with pads for soldering the first current-carrying line, the second current-carrying line, the first shielding conductor structure, and the second shielding conductor structure; and

[0012] The self-test current injection module and the manual detection module are located in the middle area of ​​the circuit board.

[0013] The circuit board of the electrical connection device provided according to the embodiments of this application has at least the following beneficial effects: Since the detection and protection device in the electrical connection device needs to detect the leakage of the current-carrying line through the shielded conductor structure and the open circuit of the shielded conductor structure of the current-carrying line, and needs to realize automatic detection and manual detection at the same time, the detection and protection device needs to be equipped with a number of modules such as a self-test current injection module, a manual detection module, a fault response module, and a trigger module. The circuit board uses the first area as the connection area with the power line, and sets multiple pads for soldering the current-carrying line and the shielded conductor structure respectively. The self-test current injection module and the manual detection module are arranged in the middle area of ​​the circuit board and adjacent to the pads to be electrically connected, which can directly realize electrical connection and shorten the traces, greatly improve the space utilization of the circuit board, thereby reducing the size of the circuit board, reducing the difficulty of traces, and the traces basically do not need to be wrapped, reducing the interference of the electrical signals transmitted on the circuit board.

[0014] According to some embodiments of the circuit board provided in this application, the self-test current injection module is used to inject a self-test current into the first shielded conductor structure or the second shielded conductor structure; the manual detection module is used to inject a simulated leakage current into the first shielded conductor structure or the second shielded conductor structure; the fault response module 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, a leakage signal detected by the second shielded conductor structure, an open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open, or the simulated leakage current injected by the manual detection module; the trigger module is used to disconnect the power connection between the input end and the output end of the power line according to the received trip trigger signal.

[0015] According to some embodiments of the circuit board provided in this application, the fault response module and the trigger module are disposed in the fourth region. The fault response module is disposed in the fourth region and can be adjacent to the pads requiring electrical connection. The trigger module is also disposed in the fourth region and can be adjacent to the fault response module requiring electrical connection, enabling direct electrical connection and shortening the trace length.

[0016] According to some embodiments of this application, the circuit board is provided with a first trace that passes sequentially from the first region through the second region and the third region and extends to the fourth region, and a second trace that extends from the central region to the first region; the first trace is located at the edge of the circuit board. The first trace serves as a carrier for the electrical connection between the trigger module and the required solder pads, and does not occupy the core space of the central region of the circuit board. This allows the area between the first trace and the self-test current injection module and the manual detection module to be used as layout space for other additional functional modules and traces, greatly improving the space utilization of the circuit board, thereby reducing the size of the circuit board, reducing the difficulty of routing, and eliminating the need for extensive routing, thus reducing interference to the electrical signals transmitted on the circuit board.

[0017] According to some embodiments of the circuit board provided in this application, the first region is provided with a first pad for soldering the first current-carrying line and a second pad for soldering the second current-carrying line; a third pad for soldering the first shielding conductor structure is provided near the second region in the first region; and a fourth pad for soldering the second shielding conductor structure is provided near the fourth region in the first region. The fault response module is adjacent to the fourth pad, and one end of the fault response module is electrically connected to the fourth pad. The trigger module is electrically connected to the first trace and the fault response module, respectively. The self-test current injection module is adjacent to the fourth pad, and one end of the self-test current injection module is electrically connected to the fourth pad, while the other end is electrically connected to the first pad via the second trace. The manual detection module is adjacent to the third pad, and one end of the manual detection module is electrically connected to the third pad.

[0018] According to some embodiments of the present application, the circuit board provided by the manual testing module includes a test switch and a first resistor. The second trace is provided with a first contact area for one end of the test switch to be pressed. The middle area of ​​the circuit board is provided with a second contact area for the other end of the test switch to be pressed. The second contact area is adjacent to and electrically connected to one end of the first resistor. The other end of the first resistor is adjacent to and electrically connected to the third pad.

[0019] According to some embodiments of the present application, the self-test current injection module includes a second resistor, one end of which is adjacent to and electrically connected to the fourth pad, and the other end of which is electrically connected to the second trace.

[0020] According to some embodiments of the present application, the circuit board of the detection protection device further includes a first diode disposed in the first region, one end of the first diode being electrically connected to the first trace and the other end being electrically connected to the second trace.

[0021] According to some embodiments of the present application, the circuit board of the detection protection device further includes a third resistor disposed in the second region, one end of the third resistor being adjacent to and electrically connected to the third pad, and the other end being electrically connected to the first trace.

[0022] According to some embodiments of the present application, the circuit board provided by the fault response module includes a fourth resistor, a first capacitor and a Zener diode. One end of the fourth resistor, one end of the first capacitor and one end of the Zener diode are adjacent and electrically connected. The other end of the fourth resistor is adjacent to and electrically connected to the fourth pad. The other end of the first capacitor and the other end of the Zener diode are both electrically connected to the trigger module.

[0023] According to some embodiments of the present application, the circuit board of the trigger module includes a fifth resistor, a second capacitor and a thyristor. The other end of the first capacitor, one end of the fifth resistor, one end of the second capacitor and a switch pin of the thyristor are all electrically connected through the first trace. The fourth region is also provided with a third trace. The other end of the Zener diode, the other end of the fifth resistor, the other end of the second capacitor and the control pin of the thyristor are all electrically connected through the third trace.

[0024] According to some embodiments of the present application, the circuit board of the detection protection device further includes a trip coil for generating electromagnetic force to disconnect the power connection. The first region is provided with a fifth pad for soldering one end of the trip coil. The fifth pad is adjacent to and electrically connected to the second pad. The middle region of the circuit board is provided with a sixth pad for soldering the other end of the trip coil. The circuit board is also provided with a fourth trace that passes through the third region and the second region from another switch pin of the thyristor and extends to the sixth pad.

[0025] According to some embodiments of the present application, the circuit board of the detection protection device further includes a first varistor and a second diode disposed in the second region. One end of the first varistor and one end of the second diode are both electrically connected to the first trace, and the other end of the first varistor and the other end of the second diode are both electrically connected to the fourth trace.

[0026] According to some embodiments of the present application, the circuit board of the detection protection device further includes an indicator module disposed in the third region. The indicator module includes a sixth resistor and a light-emitting diode. One end of the sixth resistor is electrically connected to the fourth trace, and the other end of the sixth resistor is electrically connected to one end of the light-emitting diode. The other end of the light-emitting diode is electrically connected to the first trace.

[0027] According to some embodiments of the present application, the circuit board of the detection and protection device further includes a second varistor. The first region is provided with a seventh pad and an eighth pad for soldering the two ends of the second varistor, respectively. The seventh pad is adjacent to the fifth pad. The first region is also provided with a fifth trace. The second pad, the fifth pad and the seventh pad are electrically connected through the fifth trace. The eighth pad is electrically connected to the second trace.

[0028] Secondly, embodiments of this application provide an electrical connection device, including a circuit board as described in the first aspect embodiment above, a power cord, and a detection and protection device disposed on the circuit board and connected to the power cord.

[0029] 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

[0030] 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.

[0031] The present application will be further described below with reference to the accompanying drawings and embodiments;

[0032] Figure 1 is a schematic diagram of the layout of the circuit board provided in an embodiment of this application;

[0033] Figure 2 is a circuit diagram of the power cord, self-test current injection module, and manual test module of the detection and protection device for electrical connection equipment provided in an embodiment of this application.

[0034] Figure 3 is a circuit diagram of the fault response module of the detection and protection device for electrical connection equipment provided in an embodiment of this application;

[0035] Figure 4 is a circuit diagram of the trigger module, indicator module and other components of the detection and protection device for electrical connection equipment provided in an embodiment of this application;

[0036] Figure 5 is a schematic diagram of the overall structure of the electrical connection device provided in an embodiment of this application. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Currently, with the increasing demand for safety testing of power cord detection and protection devices, the number of components in the circuit modules included in these devices is also increasing. As a result, the circuit board layout of electrical connection equipment is facing more and more challenges, such as difficulties in circuit board routing, the need for winding, the susceptibility of electrical signals transmitted on the circuit board to interference, and the need for larger board sizes.

[0043] Based on this, embodiments of this application provide a circuit board and electrical connection device for an electrical connection device, which can improve the space utilization of the circuit board, reduce the size of the circuit board, reduce the difficulty of wiring, and reduce the interference of electrical signals transmitted on the circuit board.

[0044] The embodiments of this application will be further described below with reference to the accompanying drawings.

[0045] Figure 5 is a schematic diagram of the overall structure of the electrical connection device provided in an embodiment of this application. The electrical connection device includes a power cord 100, a detection and protection device disposed on the circuit board and connected to the power cord 100, and a housing enclosing the circuit board; the housing is provided with a plug conductor for connecting to power. Since the circuit board is located inside the housing, it is not shown in Figure 1.

[0046] Figures 2 to 4 are circuit diagrams of various modules of the power line 100 detection and protection device provided in some embodiments of this application. Specifically:

[0047] The power cord 100 includes a first current-carrying wire 110, a second current-carrying wire 120, a first shielding conductor structure 130 covering the first current-carrying wire 110, and a second shielding conductor structure 140 covering the second current-carrying wire 120. The first shielding conductor structure 130 is used to collect the leakage current signal of the first current-carrying wire 110, and the second shielding conductor structure 140 is used to collect the leakage current signal of the second current-carrying wire 120. It can be understood that when the power cord 100 supplies power to electrical equipment using two-phase AC power, it can be in one of the following two situations: the first current-carrying wire 110 is the live wire L, and the second current-carrying wire 120 is the neutral wire N; or the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L. When the power supply line supplies power to electrical equipment using three-phase AC power, it can be one of the following three cases: the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L1; or the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the live wire L2. The following explanation uses the case shown in Figure 2, where the first current-carrying line 110 is the live wire L and the second current-carrying line 120 is the neutral wire N, as an example. The other cases can be understood similarly. Furthermore, the first shielding conductor structure 130 is connected to the second shielding conductor structure 140. Specifically, the first shielding conductor structure 130 includes a first end a near the input terminal of the power line 100 and a second end b near the output terminal of the power line 100; the second shielding conductor structure 140 includes a third end c near the input terminal of the power line 100 and a fourth end d near the output terminal of the power line 100; the second end b and the fourth end d are connected. It is understood that the first shielding conductor structure 130 in the leakage current detection module 220 covers the first current-carrying line 110, thereby enabling the acquisition of the leakage current signal of the first current-carrying line 110. The second shielding conductor structure 140 in the leakage current detection module 220 covers the second current-carrying line 120, thereby enabling the acquisition of the leakage current signal of the second current-carrying line 120. Based on this, the second end b of the first shielding conductor structure 130 near the output end of the power line 100 is connected to the fourth end d of the second shielding conductor structure 140 near the output end of the power line 100, so that the first shielding conductor structure 130 and the second shielding conductor structure 140 form a series detection loop. The integrity of the first shielding conductor structure 130 and the second shielding conductor structure 140 can be detected by determining whether the current can flow through the series detection loop.

[0048] Referring again to Figure 2, the detection and protection device includes a self-test current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240. The self-test current injection module 210 is used to inject a self-test current into the first shielded conductor structure 130 or the second shielded conductor structure 140. The manual detection module 220 is used to inject a simulated leakage current into the first shielded conductor structure 130 or the second shielded conductor structure 140. The fault response module 230 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 220. The trigger module 240 is used to disconnect the power connection between the input and output terminals of the power line 100 according to the received trip trigger signal.

[0049] Referring to FIG1, a first aspect embodiment of this application provides a circuit board for an electrical connection device. The circuit board includes a central region B50, a first region B10, a second region B20, a third region B30 disposed opposite to the first region B10, and a fourth region B40 disposed opposite to the second region B20. The second region B20 is connected to one side of the first region B10 and the third region B30, and the fourth region B40 is connected to the other side of the first region B10 and the third region B30. The central region B50 is surrounded by the first region B10, the second region B20, the third region B30, and the fourth region B40. It can be understood that, in the orientation shown in FIG1, the first region B10 is the left side region of the circuit board, the second region B20 is the lower side region of the circuit board, the third region B30 is the right side region of the circuit board, and the fourth region B40 is the upper side region of the circuit board. The area enclosed by the first region B10, the second region B20, the third region B30, and the fourth region B40 is the central region B50 of the circuit board.

[0050] The first region B10 is provided with a first pad 101 for soldering the first current-carrying line 110 and a second pad 102 for soldering the second current-carrying line 120. The first pad 101 is located in the lower part of the first region B10, and the second pad 102 is located in the upper part of the first region B10. A third pad 103 for soldering the first shielding conductor structure 130 is provided in the first region B10 near the second region B20. A fourth pad 104 for soldering the second shielding conductor structure 140 is provided in the first region B10 near the fourth region B40. That is, the distance between the third pad 103 and the first pad 101 is shorter, and the distance between the fourth pad 104 and the second pad 102 is shorter.

[0051] The circuit board is provided with a first trace 105 that passes through the first region B10, the second region B20 and the third region B30 and extends to the fourth region B40. The first trace 105 is located at the edge of the circuit board.

[0052] The fault response module 230 is located in the fourth region B40 and is adjacent to the fourth pad 104. That is, the fault response module 230 is located in the fourth region B40 on the left side, close to the first region B10. One end of the fault response module 230 is electrically connected to the fourth pad 104.

[0053] The trigger module 240 is also located in the fourth area B40 and is located in the area to the right of the fault response module 230. The trigger module 240 is electrically connected to the first trace 105 and the fault response module 230 respectively.

[0054] The self-test current injection module 210 is disposed in the middle region B50 of the circuit board and is adjacent to the fourth pad 104. That is, the self-test current injection module 210 is located in the middle region B50 of the circuit board, which is biased towards the upper left. One end of the self-test current injection module 210 is electrically connected to the fourth pad 104, and the other end of the self-test current injection module 210 is electrically connected to the first pad 101 through the second trace 106. The second trace 106 extends from the middle region B50 of the circuit board to the first region B10. Specifically, the second trace 106 extends to the lower part of the first region B10.

[0055] The manual detection module 220 is located in the middle area B50 of the circuit board and is adjacent to the third pad 103. That is, the manual detection module 220 is located in the middle area B50 of the circuit board, which is biased towards the lower left. One end of the manual detection module 220 is electrically connected to the third pad 103.

[0056] According to the circuit board of the electrical connection device provided in the embodiments of this application, since the detection and protection device in the electrical connection device needs to detect both the leakage current of the current-carrying line through the shielded conductor structure and the open circuit of the shielded conductor structure of the current-carrying line, and needs to realize both automatic and manual detection at the same time, the detection and protection device needs to be equipped with a number of modules such as a self-test current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240. The circuit board uses the first area B10 as the connection area with the power line 100, and sets multiple pads for soldering the current-carrying line and the shielded conductor structure respectively. The self-test current injection module 210 and the manual detection module 220 are both arranged in the middle area B50 of the circuit board and are adjacent to the pads to be electrically connected. The fault response module 230 is arranged in the fourth area B40 and is adjacent to the fourth pad 104 to be electrically connected. The trigger module 240 is also located in the fourth region B40, adjacent to the fault response module 230 that requires electrical connection. It can directly achieve electrical connection and shorten the trace. A first trace 105 is also set at the edge of the circuit board. The first trace 105 passes through the second region B20 and the third region B30 from the first region B10 and extends to the fourth region B40. It serves as the carrier for the electrical connection between the trigger module 240 and the first pad 101 and the third pad 103. It does not occupy the core space of the middle region B50 of the circuit board. This allows the area between the first trace 105 and the self-test current injection module 210 and the manual detection module 220 to be used as layout space for other additional functional modules and traces, which greatly improves the space utilization of the circuit board, thereby reducing the size of the circuit board, reducing the difficulty of trace routing, and basically eliminating the need for trace wrapping, thus reducing the interference of electrical signals transmitted on the circuit board.

[0057] Referring to Figure 2, the manual detection module 220 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 end a of the first shielding conductor structure 130.

[0058] To achieve the above-mentioned connection between the test switch TEST and the first resistor R1, referring to FIG1, in the circuit board provided in some embodiments of this application, the second trace 106 is provided with a first contact area 1061 for one end of the test switch TEST to be pressed, and the middle region B50 of the circuit board is provided with a second contact area 221 for the other end of the test switch TEST to be pressed. The second contact area 221 is adjacent to and electrically connected to one end of the first resistor R1, and the other end of the first resistor R1 is adjacent to and electrically connected to the third pad 103. Therefore, when the test switch TEST is pressed, one end of the test switch TEST touches the first contact area 1061 and is further electrically connected to the first pad 101 through the second trace 106, thereby electrically connecting to the first current-carrying line 110 through the first pad 101. The other end of the test switch TEST touches the second contact area 221, thereby electrically connecting to one end of the first resistor R1, and is electrically connected to the third pad 103 through the first resistor R1, thereby electrically connecting to the first shielding conductor structure 130 through the third pad 103, thereby realizing the injection of simulated leakage current into the first shielding conductor structure 130.

[0059] Referring to Figure 2, the self-test current injection module 210 includes a second resistor R2, one end of which is connected to the first current-carrying line 110, and the other end of which is connected to the third terminal c of the second shielding conductor structure 140.

[0060] To achieve the above-mentioned connection relationship of the second resistor R2, referring to FIG1, in the circuit board provided in some embodiments of this application, the second resistor R2 is disposed in the middle region B50 of the circuit board and adjacent to the fourth pad 104. One end of the second resistor R2 is directly electrically connected to the fourth pad 104, thereby achieving electrical connection with the second shielding conductor structure 140. The other end of the second resistor R2 is electrically connected to the second trace 106, thereby connecting to the first pad 101 through the second trace 106, and then connecting to the first current-carrying line 110 through the first pad 101. Under the action of the voltage provided by the first current-carrying line 110, a self-test current is injected into the second shielding conductor structure 140.

[0061] Referring to Figure 4, the detection protection device also includes a first diode D1, the positive terminal of which is connected to the trigger module 240, and the negative terminal of which is connected to the first current-carrying line 110.

[0062] To achieve the aforementioned connection relationship of the first diode D1, referring to FIG1, in the circuit board provided in some embodiments of this application, the first diode D1 is disposed in the first region B10 and arranged near the first pad 101. One end of the first diode D1 is electrically connected to the first trace 105, thereby achieving an electrical connection to the trigger module 240 located in the fourth region B40. The other end of the first diode D1 is electrically connected to the second trace 106, thereby achieving an electrical connection to the first pad 101. Thus, the first pad 101 is electrically connected to the first current-carrying line 110, so that the current of the trigger module 240 can flow back to the first current-carrying line 110, forming a complete current loop.

[0063] Referring to Figure 3, the detection and protection device also includes a third resistor R3. One end of the third resistor R3 is connected to the first end a of the first shielding conductor structure 130, and the other end of the third resistor R3 is connected to the fault response module 230 and the trigger module 240.

[0064] To achieve the above-mentioned connection relationship of the third resistor R3, referring to FIG1, in the circuit board provided in some embodiments of this application, the third resistor R3 is disposed in the second region B20. One end of the third resistor R3 is adjacent to and electrically connected to the third pad 103, thereby being electrically connected to the first shielding conductor structure 130 through the third pad 103. The other end of the third resistor R3 is electrically connected to the first trace 105, thereby being electrically connected to the trigger module 240 located in the fourth region B40 and the fault response module 230 located in the fourth region B40 through the first trace 105.

[0065] Referring to Figure 3, the fault response module 230 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 are connected together. The other end of the fourth resistor R4 is connected to the third terminal c of the second shielding conductor structure 140. The other ends of the first capacitor C1 and the Zener diode ZD1 are both connected to the trigger module 240.

[0066] To achieve the aforementioned connection relationship between the fourth resistor R4, the first capacitor C1, and the Zener diode ZD1, referring to FIG1, in the circuit board provided in some embodiments of this application, one end of the fourth resistor R4, one end of the first capacitor C1, and one end of the Zener diode ZD1 are arranged adjacently, facing the same area and electrically connected. The fourth resistor R4 is located to the left of the fourth region B40 and close to the first region B10. The first capacitor C1 and the Zener diode ZD1 are located in the region of the fourth region B40 close to the trigger module 240. The other end of the fourth resistor R4 is adjacent to and electrically connected to the fourth pad 104, thereby achieving electrical connection with the second shielding conductor structure 140. The other ends of the first capacitor C1 and the Zener diode ZD1 are both electrically connected to the trigger module 240.

[0067] Referring to Figure 4, the trigger module 240 includes a fifth resistor R5, a second capacitor C2, and a silicon controlled rectifier (SCR) Q1. One end of the fifth resistor R5, one end of the second capacitor C2, and the cathode of the SCR Q1 are all connected to the positive terminal of the first diode D1. The other end of the fifth resistor R5, the other end of the second capacitor C2, and the control pin of the SCR Q1 are connected together and connected to the fault response module 230. The anode of the SCR Q1 is directly or indirectly connected to the second current-carrying line 120.

[0068] To achieve the aforementioned connection relationship between the fifth resistor R5, the second capacitor C2, and the thyristor Q1, referring to Figure 1, in the circuit board provided in some embodiments of this application, the other end of the first capacitor C1, one end of the fifth resistor R5, one end of the second capacitor C2, and one switch pin of the thyristor Q1 are all electrically connected through the first trace 105, thereby achieving an electrical connection to the first diode D1. The fourth region B40 is also provided with a third trace 107, and the other end of the Zener diode ZD1, the other end of the fifth resistor R5, the other end of the second capacitor C2, and the control pin of the thyristor Q1 are all electrically connected through the third trace 107, thereby achieving an electrical connection between the other end of the fifth resistor R5, the other end of the second capacitor C2, and the control pin of the thyristor Q1 to the other end of the Zener diode ZD1 in the fault response module 230, thereby obtaining the trip trigger signal output by the fault response module 230 from the Zener diode ZD1.

[0069] Referring to Figure 4, the detection protection device also includes a trip coil Lx for generating electromagnetic force to disconnect the power connection. 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 thyristor Q1.

[0070] To achieve the above-mentioned connection relationship of the trip coil Lx, referring to FIG1, in the circuit board provided in some embodiments of this application, the first region B10 is provided with a fifth pad Lx-1 for soldering one end of the trip coil Lx. The fifth pad Lx-1 is adjacent to and electrically connected to the second pad 102, thereby realizing the electrical connection of one end of the trip coil Lx to the second current-carrying line 120. The middle region B50 of the circuit board is provided with a sixth pad Lx-2 for soldering the other end of the trip coil Lx. The circuit board is also provided with a fourth trace 108 that passes through the third region B30 and the second region B20 from another switch pin of the thyristor Q1 and extends to the sixth pad Lx-2, thereby realizing the electrical connection of the other end of the trip coil Lx to the anode of the thyristor Q1 through the fourth trace 108.

[0071] Referring to Figure 4, the detection protection device also includes a first varistor ZR1 and a second diode D2 disposed in the second region B20. The first varistor ZR1 and the second diode D2 are both connected in parallel with the thyristor Q1.

[0072] To achieve the aforementioned connection relationship between the first varistor ZR1 and the second diode D2, referring to FIG1, in the circuit board provided in some embodiments of this application, one end of the first varistor ZR1 and one end of the second diode D2 are both electrically connected to the first trace 105, thereby realizing electrical connection to the cathode of the thyristor Q1 in the trigger module 240 through the first trace 105. The other end of the first varistor ZR1 and the other end of the second diode D2 are both electrically connected to the fourth trace 108, thereby realizing electrical connection to the anode of the thyristor Q1 through the fourth trace 108.

[0073] Referring to Figure 4, the detection protection device also includes an indicator module 250. The indicator module 250 includes 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 of the sixth resistor R6 is connected to the positive terminal of the light-emitting diode LED1. The negative terminal of the light-emitting diode LED1 is connected to the positive terminal of the first diode D1.

[0074] To achieve the above-mentioned connection between the sixth resistor R6 and the light-emitting diode LED1, referring to FIG1, in the circuit board provided in some embodiments of this application, the indicator module 250 is disposed in the third region B30, one end of the sixth resistor R6 is electrically connected to the fourth trace 108, thereby realizing the connection to the trip coil Lx through the fourth trace 108, the other end of the sixth resistor R6 is electrically connected to one end of the light-emitting diode LED1, and the other end of the light-emitting diode LED1 is electrically connected to the first trace 105, thereby realizing the connection to the first diode D1 through the first trace 105.

[0075] Referring to Figure 4, the detection and protection device also includes a second varistor ZR2, with the two ends of the second varistor ZR2 being the first current-carrying line 110 and the second current-carrying line 120, respectively.

[0076] To achieve the above-mentioned connection relationship of the second varistor ZR2, referring to FIG1, in the circuit board provided in some embodiments of this application, the first region B10 is provided with a seventh pad ZR2-1 and an eighth pad ZR2-2 for soldering the two ends of the second varistor ZR2, respectively. The seventh pad ZR2-1 is adjacent to the fifth pad Lx-1. The first region B10 is also provided with a fifth trace 109. The second pad 102, the fifth pad Lx-1 and the seventh pad ZR2-1 are electrically connected through the fifth trace 109, thereby realizing the electrical connection of the second pad 102 through the fifth trace 109, and then the electrical connection to the second current-carrying line 120. The eighth pad ZR2-2 is electrically connected to the second trace 106, thereby being electrically connected to the first pad 101 through the second trace 106, and then the electrical connection to the first current-carrying line 110.

[0077] Additionally, referring to FIG5, a second aspect of the present invention provides an electrical connection device, including a circuit board as described in the first aspect embodiment above, a power cord 100, and a detection and protection device disposed on the circuit board and connected to the power cord 100.

[0078] According to the embodiments of this application, the electrical connection device requires both the detection and protection device to detect leakage current of the current-carrying line through the shielded conductor structure and the open circuit of the shielded conductor structure of the current-carrying line, and it also needs to achieve both automatic and manual detection simultaneously. Therefore, the detection and protection device needs to be equipped with a number of modules, such as a self-testing current injection module 210, a manual detection module 220, a fault response module 230, and a trigger module 240. The circuit board uses the first area B10 as the connection area with the power line 100, and sets multiple pads for soldering the current-carrying line and the shielded conductor structure. The self-testing current injection module 210 and the manual detection module 220 are both arranged in the middle area B50 of the circuit board and are adjacent to the pads to be electrically connected. The fault response module 230 is set in the fourth area B40 and is adjacent to the fourth pad 104 to be electrically connected. The trigger module 240... 40 is also located in the fourth region B40, adjacent to the fault response module 230 that requires electrical connection, enabling direct electrical connection and shortening the trace. A first trace 105 is also set at the edge of the circuit board. The first trace 105 passes through the second region B20 and the third region B30 from the first region B10 and extends to the fourth region B40, serving as a carrier for the electrical connection between the trigger module 240 and the first pad 101 and the third pad 103. It does not occupy the core space of the central region B50 of the circuit board, so that the area between the first trace 105 and the self-test current injection module 210 and the manual detection module 220 can be used as layout space for other additional functional modules and traces, greatly improving the space utilization of the circuit board, thereby reducing the size of the circuit board, reducing the difficulty of trace routing, and basically eliminating the need for trace wrapping, thus reducing the interference of electrical signals transmitted on the circuit board.

[0079] 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.

[0080] 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 circuit board for an electrical connection device, wherein, The electrical connection device includes a power cord and a detection and protection device disposed on the circuit board and electrically connected to the power cord. The power line includes a first current-carrying line, a second current-carrying line, a first shielding conductor structure covering the first current-carrying line, and a second shielding conductor structure covering the second current-carrying line. The first shielding conductor structure is connected to the second shielding conductor structure. The detection and protection device includes a self-test current injection module, a manual detection module, a fault response module, and a trigger module; The circuit board includes a central region, a first region, a second region, a third region opposite to the first region, and a fourth region opposite to the second region. The second region is connected to one side of the first region and the third region, and the fourth region is connected to the other side of the first region and the third region. The central region is surrounded by the first region, the second region, the third region, and the fourth region. The first region is provided with pads for soldering the first current-carrying line, the second current-carrying line, the first shielding conductor structure, and the second shielding conductor structure; and The self-test current injection module and the manual detection module are located in the middle area of ​​the circuit board.

2. The circuit board according to claim 1, wherein, The self-test current injection module is used to inject a self-test current into the first shielded conductor structure or the second shielded conductor structure; the manual detection module is used to inject a simulated leakage current into the first shielded conductor structure or the second shielded conductor structure; the fault response module 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, a leakage signal detected by the second shielded conductor structure, an open circuit signal generated when the first shielded conductor structure or the second shielded conductor structure is open, or the simulated leakage current injected by the manual detection module; the trigger module is used to disconnect the power connection between the input and output terminals of the power line according to the received trip trigger signal.

3. The circuit board according to claim 2, wherein, The fault response module and the triggering module are located in the fourth area.

4. The circuit board according to claim 2 or 3, wherein, The circuit board has a first trace that passes sequentially from the first region through the second region and the third region and extends to the fourth region, and a second trace that extends from the central region to the first region; the first trace is located at the edge of the circuit board.

5. The circuit board according to claim 4, wherein, The first region is provided with a first pad for soldering the first current-carrying line and a second pad for soldering the second current-carrying line. A third pad for soldering the first shielding conductor structure is provided in the first region near the second region. A fourth pad for soldering the second shielding conductor structure is provided in the first region near the fourth region. The fault response module is adjacent to the fourth pad, and one end of the fault response module is electrically connected to the fourth pad. The triggering module is electrically connected to the first trace and the fault response module, respectively. The self-test current injection module is adjacent to the fourth pad, one end of the self-test current injection module is electrically connected to the fourth pad, and the other end is electrically connected to the first pad through the second trace; and The manual inspection module is adjacent to the third pad, and one end of the manual inspection module is electrically connected to the third pad.

6. The circuit board according to claim 5, wherein, The manual testing module includes a test switch and a first resistor. The second trace is provided with a first contact area for one end of the test switch to be pressed. The middle area of ​​the circuit board is provided with a second contact area for the other end of the test switch to be pressed. The second contact area is adjacent to and electrically connected to one end of the first resistor. The other end of the first resistor is adjacent to and electrically connected to the third pad.

7. The circuit board according to claim 5 or 6, wherein, The self-test current injection module includes a second resistor, one end of which is adjacent to and electrically connected to the fourth pad, and the other end of which is electrically connected to the second trace.

8. The circuit board according to any one of claims 5 to 7, wherein, The detection and protection device further includes a first diode disposed in the first region, one end of the first diode being electrically connected to the first trace and the other end being electrically connected to the second trace.

9. The circuit board according to any one of claims 5 to 8, wherein, The detection and protection device further includes a third resistor disposed in the second region, one end of which is adjacent to and electrically connected to the third pad, and the other end of which is electrically connected to the first trace.

10. The circuit board according to any one of claims 5 to 9, wherein, The fault response module includes a fourth resistor, a first capacitor, and a Zener diode. One end of the fourth resistor, one end of the first capacitor, and one end of the Zener diode are adjacent and electrically connected. The other end of the fourth resistor is adjacent to and electrically connected to the fourth pad. The other ends of the first capacitor and the Zener diode are both electrically connected to the trigger module.

11. The circuit board according to claim 10, wherein, The trigger module includes a fifth resistor, a second capacitor, and a thyristor. The other end of the first capacitor, one end of the fifth resistor, one end of the second capacitor, and one switch pin of the thyristor are all electrically connected through the first trace. The fourth region is also provided with a third trace, and the other end of the Zener diode, the other end of the fifth resistor, the other end of the second capacitor, and the control pin of the thyristor are all electrically connected through the third trace.

12. The circuit board according to claim 11, wherein, The detection and protection device further includes a trip coil for generating electromagnetic force to disconnect the power connection. The first region is provided with a fifth pad for soldering one end of the trip coil. The fifth pad is adjacent to and electrically connected to the second pad. The middle region of the circuit board is provided with a sixth pad for soldering the other end of the trip coil. The circuit board is also provided with a fourth trace that passes through the third region and the second region from another switch pin of the thyristor and extends to the sixth pad.

13. The circuit board according to claim 12, wherein, The detection and protection device further includes a first varistor and a second diode disposed in the second region. One end of the first varistor and one end of the second diode are both electrically connected to the first trace, and the other end of the first varistor and the other end of the second diode are both electrically connected to the fourth trace.

14. The circuit board according to claim 12 or 13, wherein, The detection and protection device further includes an indicator module disposed in the third region. The indicator module includes a sixth resistor and a light-emitting diode. One end of the sixth resistor is electrically connected to the fourth trace, and the other end of the sixth resistor is electrically connected to one end of the light-emitting diode. The other end of the light-emitting diode is electrically connected to the first trace.

15. The circuit board according to any one of claims 12 to 14, wherein, The detection and protection device further includes a second varistor. The first region is provided with a seventh pad and an eighth pad for soldering the two ends of the second varistor, respectively. The seventh pad is adjacent to the fifth pad. The first region is also provided with a fifth trace. The second pad, the fifth pad and the seventh pad are electrically connected through the fifth trace. The eighth pad is electrically connected to the second trace.

16. An electrical connection device comprising a circuit board as described in any one of claims 1 to 15, a power cord, and a detection and protection device disposed on the circuit board and connected to the power cord.

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