Circuit board of electrical connection device, and electrical connection device

Abstract

Disclosed in the present application are a circuit board of an electrical connection device, and an electrical connection device. The electrical connection device comprises a power line (100), a detection-protection apparatus and a housing (400); the detection-protection apparatus comprises an open-circuit detection unit (211), an electric leakage detection unit (212), a driving module (220), a tripping module (230), a test module (250) comprising a test switch, and a reset button. The circuit board comprises a first board surface (301) and a second board surface (302); the tripping module (230) is arranged in the middle area of the first board surface (301), and current-carrying conductors (260) are provided on two sides of the tripping module (230); the second board surface (302) is provided with a first area (310) located at the edge of the circuit board, the open-circuit detection unit (211) is arranged in the first area (310), and the first board surface (301) is provided with a shielded conductor solder point (311) at a position corresponding to the first area (310); the test switch and the reset button are arranged in the middle area of the second board surface (302); the electric leakage detection unit (212) and the driving module (220) are arranged in the areas of the second board surface (302) adjacent to the test switch and the reset button.

Description

Circuit board for electrical connection device and electrical connection device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent applications with application number 202311621811.9 filed on November 29, 2023, entitled “Circuit board for electrical connection device and electrical connection device”, application number 202410590986.6 filed on May 13, 2024, entitled “Circuit board for electrical connection device and electrical connection device”, and application number 202421037099.8 filed on May 13, 2024, entitled “Circuit board for electrical connection device and electrical connection device”. The entire contents of the above patents are incorporated into this application by reference. Technical Field

[0003] The present application relates to the technical field of circuit boards, and in particular to a circuit board for an electrical connection device and an electrical connection device. Background Art

[0004] A leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power cord through a leakage current detection line and, when a certain leakage current is detected, disconnects the appliance from the power supply, ensuring safe use. In recent years, leakage current detection circuit breakers have not only required leakage current detection through the leakage current detection line, but have also introduced higher safety detection requirements, such as the need to detect whether the leakage current detection line is open.

[0005] Summary of the Invention

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

[0007] In a first aspect, an embodiment of the present application provides a circuit board for an electrical connection device, the electrical connection device comprising a power cord, a detection and protection device disposed on the circuit board and connected to the power cord, and a housing enclosing the circuit board; the housing being provided with a plug conductor for connecting to a power source; wherein:

[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;

[0009] The detection and protection device includes an open circuit detection unit, a leakage detection unit, a drive module, a trip module, a test module including a test switch, and a reset button;

[0010] The circuit board comprises a first board surface facing the plug conductor and a second board surface away from the plug conductor;

[0011] The trip module is arranged in the middle area of ​​the first panel; current-carrying conductors for contacting and pressing the plug conductors to obtain power are arranged on both sides of the trip module;

[0012] The second board surface is provided with a first area located at an edge of the circuit board, the open circuit detection unit is provided in the first area, and a shielding conductor soldering point for soldering and connecting the first shielding conductor structure and / or the second shielding conductor structure is provided at a position of the first board surface corresponding to the first area; and

[0013] The test switch and the reset button are arranged in the middle area of ​​the second board surface; the leakage detection unit and the driving module are arranged in the area of ​​the second board surface adjacent to the test switch and the reset button.

[0014] According to some embodiments of the present application, the reset button, the test switch, and the first area are arranged in sequence along the longitudinal axis of the second panel.

[0015] According to some embodiments of the present application, the leakage detection unit is located in a left area of ​​the test switch, and the driving module is located in a left area of ​​the reset button and is adjacent to the leakage detection unit.

[0016] According to some embodiments of the present application, the leakage detection unit is located in a right area of ​​the test switch, and the driving module is located in a right area of ​​the reset button and is adjacent to the leakage detection unit.

[0017] According to some embodiments of the present application, the leakage detection unit is close to the test switch, so that when the test switch of the test module is pressed, the transmission path of the leakage signal on the simulated first shielded conductor structure and the second shielded conductor structure is shorter, which is more convenient for wiring; the driving module is close to the leakage detection unit, and the path of the leakage fault signal output by the leakage detection unit to be transmitted to the driving module is shorter, which is more convenient for wiring.

[0018] According to some embodiments of the present application, the current-carrying conductor extends along the longitudinal axis of the first board surface, the end of the current-carrying conductor away from the shielding conductor solder point is a power contact end for contacting the plug conductor, and the end of the current-carrying conductor close to the shielding conductor solder point is a power output solder point for welding the first current-carrying line or the second current-carrying line.

[0019] According to some embodiments of the present application, the first shielding conductor structure includes a first end close to the circuit board, a second end away from the first end, and a third end located between the first end and the second end; the second shielding conductor structure includes a fourth end close to the circuit board, a fifth end away from the fourth end, and a sixth end located between the fourth end and the fifth end; the third end is connected to the sixth end; the first area is provided with four shielding conductor solder joints for connecting to the first end, the second end, the fourth end, and the fifth end, respectively.

[0020] According to some embodiments of the present application, the first region is further provided with two shielding conductor welding points for connecting to the third end and the sixth end respectively.

[0021] According to some embodiments of the present application, the open circuit detection unit includes a first switch unit and a second switch unit; the first switch unit includes a first transistor and a first resistor that provides a turn-on voltage for the first transistor; the second switch unit includes a second transistor and a fourth resistor that provides a turn-on voltage for the second transistor; the two ends of the first resistor are respectively electrically connected to the shielded conductor solder joints corresponding to the first end and the fourth end, and the two ends of the fourth resistor are respectively electrically connected to the shielded conductor solder joints corresponding to the second end and the fifth end.

[0022] According to some embodiments of the present application, the two ends of the first resistor are electrically connected to the shielding conductor solder joints corresponding to the first end and the fifth end, and the two ends of the fourth resistor are electrically connected to the shielding conductor solder joints corresponding to the second end and the fourth end.

[0023] According to some embodiments of the present application, the first switching unit further includes a second resistor and a third resistor, one end of the second resistor is connected to the second current-carrying line, the other end of the second resistor is connected to one end of the first resistor and the emitter of the first transistor, the other end of the first resistor is connected to the base of the first transistor and one end of the third resistor, and the other end of the third resistor is connected to the first current-carrying line; the second switching unit further includes a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the second current-carrying line, the other end of the fifth resistor is connected to one end of the fourth resistor and the emitter of the second transistor, the other end of the fourth resistor is connected to the base of the second transistor and one end of the sixth resistor, and the other end of the sixth resistor is connected to the first current-carrying line; the collector of the first transistor and the collector of the second transistor are connected to the driving module; the first transistor, the second transistor, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are all arranged in the first area.

[0024] According to some embodiments of the present application, the open circuit detection unit includes a first switch unit and a second switch unit; the first switch unit includes a first transistor and a first voltage divider unit; the first voltage divider unit includes a second resistor, a first resistor, a seventeenth resistor and a third resistor connected in series in sequence; the second switch unit includes a second transistor and a second voltage divider unit; the second voltage divider unit includes a fifth resistor, a fourth resistor, an eighteenth resistor and a sixth resistor connected in series in sequence; the connection point between the second resistor and the first resistor is connected to the shielded conductor welding point corresponding to the first end and the emitter of the first transistor; the connection point between the first resistor and the seventeenth resistor is connected to the base of the first transistor; the connection point between the seventeenth resistor and the third resistor is connected to the shielded conductor welding point corresponding to the fourth end; the fifth resistor and the first resistor are connected to the shielded conductor welding point corresponding to the fourth end; The connection point of the fourth resistor is connected to the shielding conductor welding point corresponding to the second end and the emitter of the second transistor; the connection point of the fourth resistor and the eighteenth resistor is connected to the base of the second transistor; the connection point of the eighteenth resistor and the sixth resistor is connected to the shielding conductor welding point corresponding to the fifth end; the second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line; the collector of the first transistor and the collector of the second transistor are connected to the driving module; the first transistor, the second transistor, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventeenth resistor and the eighteenth resistor are all arranged in the first area.

[0025] According to some embodiments of the present application, the leakage detection unit includes a fourteenth resistor, a fifteenth resistor, a third transistor and a third diode, one end of the fourteenth resistor is connected to the second current-carrying line, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the base of the third transistor, the emitter of the third transistor is connected to the cathode of the third diode, the anode of the third diode is connected to the shielding conductor welding point corresponding to the sixth end, the other end of the fifteenth resistor is connected to the first current-carrying line, and the collector of the third transistor is connected to the driving module; the fourteenth resistor, the fifteenth resistor, the third transistor and the third diode are all arranged in the second area on the second board surface located to the left of the test switch.

[0026] According to some embodiments of the present application, the leakage detection unit includes an eleventh resistor and a voltage stabilizing unit, the positive pole of the voltage stabilizing unit is connected to the driving module, the negative pole of the voltage stabilizing unit is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the shielding conductor solder joint corresponding to the sixth end; the eleventh resistor and the voltage stabilizing unit are both arranged in the second area on the second board surface located to the left of the test switch.

[0027] According to some embodiments of the present application, the test module also includes an eighth resistor, one end of the test switch is connected to the connection point between the second resistor and the fifth resistor, the other end of the test switch is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to the shielding conductor solder joint corresponding to the third end; the eighth resistor is arranged in the middle area of ​​the second board surface and is adjacent to the test switch.

[0028] According to some embodiments of the present application, the leakage detection unit includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a third transistor, one end of the fourteenth resistor is connected to the second current-carrying line, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the base of the third transistor, the emitter of the third transistor is connected to any one of the shielding conductor solder joints, the other end of the fifteenth resistor is connected to the first current-carrying line, the collector of the third transistor is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is connected to the driving module; the fourteenth resistor, the fifteenth resistor, the sixteenth resistor and the third transistor are all arranged in the second area on the second board surface located to the left of the test switch.

[0029] According to some embodiments of the present application, the leakage detection unit includes an eleventh resistor and a voltage stabilizing unit, the positive pole of the voltage stabilizing unit is connected to the driving module, the negative pole of the voltage stabilizing unit is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to any one of the shielding conductor solder joints; the eleventh resistor and the voltage stabilizing unit are both arranged in the second area on the second board surface to the left of the test switch.

[0030] According to some embodiments of the present application, the driving module includes a thyristor, a seventh resistor, a tenth resistor and a first capacitor, the detection and protection device also includes a tripping coil, the second current-carrying line is connected to one end of the tripping coil, the other end of the tripping coil is connected to the anode of the thyristor, the control electrode of the thyristor is connected to one end of the seventh resistor, one end of the tenth resistor, one end of the first capacitor and the leakage detection unit, the other end of the tenth resistor is connected to the open circuit detection unit, the cathode of the thyristor, the other end of the first capacitor and the other end of the seventh resistor are all connected to the first current-carrying line; the thyristor, the seventh resistor, the tenth resistor and the first capacitor are all arranged in the third area on the second board surface located to the left of the reset button.

[0031] According to some embodiments of the present application, the length dimension range of the circuit board is 56mm±10mm, and the width dimension range is 36mm±10mm; the length dimension range of the first area is 30mm±3mm, and the width dimension range is 8.5mm±10mm; the length dimension range of the layout area of ​​the leakage detection unit on the second board surface is 10mm±3mm, and the width dimension range is 8mm±3mm; the length dimension range of the layout area of ​​the drive module on the second board surface is 15mm±3mm, and the width dimension range is 10mm±3mm.

[0032] According to some embodiments of the present application, the components in the open circuit detection unit, the leakage detection unit, the driving module and the tripping module are packaged using surface mount packaging or plug-in packaging.

[0033] According to some embodiments of the present application, the circuit board adopts a single-sided board, a double-sided board or a multi-layer board routing method.

[0034] According to some embodiments of the present application, the circuit board is processed by wave soldering, reflow soldering or manual processing.

[0035] In the second aspect, an embodiment of the present application provides an electrical connection device, including a circuit board as described in the embodiment of the first aspect above, a power cord, a detection and protection device arranged on the circuit board and connected to the power cord, and a shell that wraps the circuit board; the shell is provided with a plug conductor for connecting to a power supply.

[0036] According to some embodiments of the present application, a wire clip for clamping the power cord is provided at the connection between the housing and the power cord; the first shielded conductor structure includes a first end close to the circuit board, a second end away from the first end, and a third end located between the first and second ends; the second shielded conductor structure includes a fourth end close to the circuit board, a fifth end away from the fourth end, and a sixth end located between the fourth and fifth ends; the third end and the sixth end are electrically connected through one of the following three situations:

[0037] Case 1: Soldering the connection at the line card;

[0038] Case 2: welding connection inside the shell;

[0039] Case 3: Connecting to the shield conductor solder joint to achieve electrical connection through the circuit board.

[0040] Other features and advantages of the present application will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present application. The purposes and other advantages of the present application can be achieved and obtained through the structures particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are used to provide a further understanding of the technical solution of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the technical solution of the present application and do not constitute a limitation on the technical solution of the present application.

[0042] The present application is further described below with reference to the accompanying drawings and embodiments;

[0043] FIG1 is a schematic diagram of the overall structure of an electrical connection device provided in one embodiment of the present application;

[0044] FIG2 is a circuit diagram of a detection and protection device for a power line according to an embodiment of the present application;

[0045] FIG3 is a circuit diagram of a power line detection and protection device provided by another embodiment of the present application;

[0046] FIG4 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0047] FIG5 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0048] FIG6 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0049] FIG7 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0050] FIG8 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0051] FIG9 is a circuit diagram of a detection and protection device for a power line provided by yet another embodiment of the present application;

[0052] FIG10 is a schematic diagram of the layout of the first board surface of the circuit board of the electrical connection device provided in one embodiment of the present application;

[0053] FIG11 is a schematic diagram of the layout of the second board surface of the circuit board of the electrical connection device provided in one embodiment of the present application;

[0054] FIG12 is a schematic diagram of the layout of the first board surface of the circuit board of the electrical connection device provided in another embodiment of the present application; and

[0055] FIG13 is a schematic diagram of the layout of the second surface of the circuit board of the electrical connection device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0056] This section will describe the specific embodiments of the present application in detail. The preferred embodiments of the present application are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present application, but it cannot be understood as a limitation on the scope of protection of the present application.

[0057] In the description of the embodiments of this application, "several" means one or more, "more" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, and "above," "below," and "within" are understood to include the number itself. "At least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If "first," "second," or the like is used in the description, it is only for the purpose of distinguishing technical features and is not to be understood as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.

[0058] It should be noted that the terms "dispose," "install," and "connect" in the embodiments of this application should be interpreted broadly. Those skilled in the art can reasonably determine the specific meanings of these terms in the embodiments of this application based on the specific content of the technical solution. For example, the term "connect" can refer to mechanical connection, electrical connection, or communication; it can refer to direct connection or indirect connection through an intermediary.

[0059] It should be noted that the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0060] A leakage current detection circuit breaker (LCDI) is a power connection device for electrical appliances that can detect the leakage current of a power cord group through a leakage current detection line, and cut off the power connection of the appliance when a certain leakage current is detected, ensuring safe use. In recent years, in addition to the need to detect the leakage current of the power cord through the leakage current detection line, leakage current detection circuit breakers have also put forward higher safety detection requirements, such as the need to detect whether the leakage current detection line has an open circuit. At present, as the demand for safety detection of power cord detection and protection devices becomes higher and higher, the number of components of the circuit modules included in the detection and protection devices is also increasing. Therefore, the circuit board layout of electrical connection equipment is also facing more and more challenges, such as the difficulty of routing the circuit board, the electrical signals transmitted on the circuit board are easily interfered with, and the circuit board requires a large board size.

[0061] Based on this, the embodiments of the present application provide a circuit board layout of an electrical connection device and an electrical connection device, which can simplify wiring, improve anti-interference capabilities, and minimize the size of the circuit board.

[0062] The embodiments of the present application are further described below with reference to the accompanying drawings.

[0063] Figure 1 is a schematic diagram of the overall structure of an electrical connection device provided in an embodiment of the present application. The electrical connection device includes a power cord 100, a detection and protection device mounted on a circuit board and connected to the power cord 100, and a housing 400 enclosing the circuit board. Housing 400 is provided with a plug-in conductor 410 for connecting to a power source. The circuit board is located inside housing 400 and is therefore not shown in Figure 1.

[0064] FIG2 to FIG9 are circuit diagrams of a detection and protection device for a power line 100 according to some embodiments of the present application. Specifically:

[0065] The power cord 100 includes a first current-carrying wire 110, a second current-carrying wire 120, a first shielded conductor structure 130 covering the first current-carrying wire 110, and a second shielded conductor structure 140 covering the second current-carrying wire 120; the first shielded conductor structure 130 includes a first end a close to the circuit board, a second end b away from the first end a, and a third end c located between the first end a and the second end b; the second shielded conductor structure 140 includes a fourth end d close to the circuit board, a fifth end e away from the fourth end d, and a sixth end f located between the fourth end d and the fifth end e; the third end c is connected to the sixth end f. It can be understood that the first shielding conductor structure 130 covers the first current-carrying line 110 so that the leakage signal of the first current-carrying line 110 can be collected, and the second shielding conductor structure 140 covers the second current-carrying line 120 so that the leakage signal of the second current-carrying line 120 can be collected. On this basis, by connecting the third end c in the middle of the first shielding conductor structure 130 with the sixth end f in the second shielding conductor structure 140, a connection point exists between the shielding conductor structures of the first current-carrying line 110 and the second current-carrying line 120, and the two shielding conductor structures are no longer independent and separated; so that the first shielding conductor structure 130 and the second shielding conductor structure 140 can construct a variety of different detection paths for open circuit detection, for example, the first end c of the first shielding conductor structure 130 can be connected to the sixth end f of the second shielding conductor structure 140. The detection path is from the first end a to the third end c, then to the sixth end f of the second shielding conductor structure 140, and finally to the fourth end d of the second shielding conductor structure 140; the detection path is from the first end a of the first shielding conductor structure 130 to the third end c, then to the sixth end f of the second shielding conductor structure 140, and finally to the fifth end e of the second shielding conductor structure 140; the detection path is from the second end b of the first shielding conductor structure 130 to the third end c, then to the sixth end f of the second shielding conductor structure 140, and finally to the fourth end d of the second shielding conductor structure 140; the detection path is from the second end b of the first shielding conductor structure 130 to the third end c, then to the sixth end f of the second shielding conductor structure 140, and finally to the fifth end e of the second shielding conductor structure 140.

[0066] The detection and protection device includes an open circuit detection unit 211, a leakage detection unit 212, a drive module 220, a trip module 230, a test module 250, an LED indication unit 260 and a lightning protection unit 270; wherein:

[0067] The open circuit detection unit 211 includes a first switch unit 201 and a second switch unit 202. In the embodiments shown in Figures 2 to 7, the first switch unit 201 includes a first transistor Q1, a first resistor R1, a second resistor R2, and a third resistor R3, and the second switch unit 202 includes a second transistor Q2, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. In the embodiments shown in Figures 8 to 9, the first switch unit 201 includes a first transistor Q1 and a first voltage divider unit, and the first voltage divider unit includes a first resistor R1, a second resistor R2, a third resistor R3, and a seventeenth resistor R17. The second switch unit 202 includes a second transistor Q2 and a second voltage divider unit, and the second voltage divider unit includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and an eighteenth resistor R18.

[0068] In the embodiments shown in FIG2 to FIG4 and FIG8 , the leakage detection unit 212 includes a voltage stabilizing unit ZD1 and an eleventh resistor R11; in the embodiments shown in FIG5 to FIG7 , the leakage detection unit 212 includes a third transistor Q3, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a third diode D3; in the embodiment shown in FIG9 , the leakage detection unit 212 includes a third transistor Q3, a fourteenth resistor R14, a fifteenth resistor R15, and a third diode D3;

[0069] The driving module 220 includes a thyristor Q4, a seventh resistor R7, a tenth resistor R10, and a first capacitor C1;

[0070] The test module 250 includes a test switch TEST1 in the embodiments shown in FIG2 and FIG5 ; the test module 250 includes a test switch TEST1 and an eighth resistor R8 in the embodiments shown in FIG3 , FIG6 , FIG8 , and FIG9 ; the test module 250 includes a test switch TEST1 , an eighth resistor R8 , and a ninth resistor R9 in the embodiments shown in FIG4 and FIG7 ;

[0071] The LED indicating unit 260 includes a twelfth resistor R12, a thirteenth resistor R13 and a light emitting diode LED1;

[0072] The lightning protection unit 270 includes a first varistor ZR1;

[0073] The detection and protection device further includes a trip coil Lx, a first diode D1, a second diode D2, and a second varistor ZR2.

[0074] Specifically, in the embodiments shown in FIG. 2 to FIG. 7 , the connection relationship of each circuit component is as follows:

[0075] The second current-carrying line 120 is connected to one end of the trip coil Lx and one end of the first varistor ZR1. The other end of the first varistor ZR1 is connected to the first current-carrying line 110. The other end of the trip coil Lx is connected to one end of the thirteenth resistor R13, the cathode of the second diode D2, one end of the second varistor ZR2, the anode of the thyristor Q4, one end of the second resistor R2, one end of the fifth resistor R5, and one end of the test switch TEST1. The other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the anode of the light-emitting diode LED1. The other end of the second resistor R2 is connected to one end of the first resistor R1 and the emitter of the first transistor Q1. The other end of the first resistor R1 is connected to one end of the third resistor R3 and the base of the first transistor Q1. The other end of the fifth resistor R5 is connected to one end of the fourth resistor R4 and the emitter of the second transistor Q2. The other end of the fourth resistor R4 is connected to the sixth resistor R5. One end of R6 is connected to the base of the second transistor Q2; the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and then connected to one end of the tenth resistor R10; the other end of the tenth resistor R10 is connected to one end of the seventh resistor R7, one end of the first capacitor C1, and the control electrode of the thyristor Q4; the other end of the sixth resistor R6, the other end of the third resistor R3, the other end of the seventh resistor R7, the other end of the first capacitor C1, the cathode of the thyristor Q4, the other end of the second varistor ZR2, the anode of the second diode D2, and the cathode of the light-emitting diode LED1 are all connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the first current-carrying line 110.

[0076] For the first resistor R1, in the embodiments of Figures 2 and 5, one end of the first resistor R1 is also connected to the first end a, and the other end of the first resistor R1 is also connected to the fourth end d; in the embodiments of Figures 4 and 7, one end of the first resistor R1 is also connected to the first end a, and the other end of the first resistor R1 is also connected to the fifth end e.

[0077] For the fourth resistor R4, in the embodiments of Figures 2 and 5, one end of the fourth resistor R4 is also connected to the second end b, and the other end of the fourth resistor R4 is also connected to the fifth end e; in the embodiments of Figures 4 and 7, one end of the fourth resistor R4 is also connected to the second end b, and the other end of the fourth resistor R4 is also connected to the fourth end d.

[0078] Regarding the leakage detection unit 212, in the embodiments shown in FIG2 and FIG4 , the positive electrode of the voltage stabilizing unit ZD1 is connected to the control electrode of the thyristor Q4, the negative electrode of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; in the embodiments shown in FIG5 and FIG7 , the base of the third transistor Q3 is connected to one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15, and the other end of the fourteenth resistor R14 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f. The first end of the third transistor Q3 is connected to the connection point of the trip coil Lx and the anode of the thyristor Q4, the other end of the fifteenth resistor R15 is connected to the connection point of the cathode of the thyristor Q4 and the anode of the first diode D1, the collector of the third transistor Q3 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor R16 is connected to the control electrode of the thyristor Q4; the emitter of the third transistor Q3 is connected to the cathode of the third diode D3, and the anode of the third diode D3 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0079] For the test module 250, in the embodiments shown in Figures 2 and 5, the other end of the test switch TEST1 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; in the embodiments shown in Figures 3 and 6, the other end of the test switch TEST1 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; in the embodiments shown in Figures 4 and 7, the other end of the test switch TEST1 is connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are connected to any two of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f.

[0080] In addition, in the embodiments shown in FIG8 and FIG9 , the connection relationship of each circuit component is as follows:

[0081] The second current-carrying line 120 is connected to one end of the tripping coil Lx and one end of the first varistor ZR1. The other end of the first varistor ZR1 is connected to the first current-carrying line 110. The other end of the tripping coil Lx is connected to one end of the thirteenth resistor R13, the cathode of the second diode D2, one end of the second varistor ZR2, the anode of the thyristor Q4, one end of the second resistor R2, one end of the fifth resistor R5, and one end of the test switch TEST1. The other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is connected to the anode of the light-emitting diode LED1. The other end of the second resistor R2 is connected to one end of the first resistor R1, the emitter of the first transistor Q1, and the first end a. The other end of the first resistor R1 is connected to one end of the seventeenth resistor R17 and the base of the first transistor Q1. The other end of resistor R17 is connected to the fourth end d; the other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, the emitter of the second transistor Q2, and the second end b; the other end of the fourth resistor R4 is connected to one end of the eighteenth resistor R18 and the base of the second transistor Q2, and the other end of the eighteenth resistor R18 is connected to the fifth end e; the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and then connected to one end of the tenth resistor R10 and one end of the seventh resistor R7; the other end of the tenth resistor R10 is connected to one end of the first capacitor C1 and the control electrode of the thyristor Q4; the other end of the sixth resistor R6, the other end of the third resistor R3, the other end of the seventh resistor R7, the other end of the first capacitor C1, the cathode of the thyristor Q4, the other end of the second varistor ZR2, the anode of the second diode D2, and the cathode of the light-emitting diode LED1 are all connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the first current-carrying line 110.

[0082] Regarding the leakage detection unit 212, in the embodiment shown in FIG8 , the positive electrode of the voltage stabilizing unit ZD1 is connected to the connection point of the tenth resistor R10 and the collector of the first transistor Q1 and the collector of the second transistor Q2; the negative electrode of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11; the other end of the eleventh resistor R11 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; wherein the other end of the eleventh resistor R11 is preferably connected to the sixth end f; in the embodiment shown in FIG9 , the base of the third transistor Q3 is connected to one end of the fourteenth resistor R14 and one end of the fifteenth resistor R15. The other end of the fourteenth resistor R14 is connected to the connection point of the tripping coil Lx and the anode of the thyristor Q4. The other end of the fifteenth resistor R15 is connected to the connection point of the cathode of the thyristor Q4 and the anode of the first diode D1. The collector of the third transistor Q3 is connected to the connection point of the tenth resistor R10 and the collectors of the first transistor Q1 and the second transistor Q2. The emitter of the third transistor Q3 is connected to the cathode of the third diode D3. The anode of the third diode D3 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f. The anode of the third diode D3 is preferably connected to the sixth end f.

[0083] For the test module 250, in the embodiments shown in Figures 8 and 9, the other end of the test switch TEST1 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f, wherein the other end of the eighth resistor R8 is preferably connected to the third end c.

[0084] Next, the operation of the above-mentioned detection and protection device under various leakage and open circuit conditions will be described using the embodiment shown in FIG5 :

[0085] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 130:

[0086] After the first shielding conductor structure 130 obtains the leakage signal, the third transistor Q3 is turned on, forming a conductive path of the first current-carrying line 110 - the first shielding conductor structure 130 - the third diode D3 - the third transistor Q3 - the sixteenth resistor R16 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0087] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0088] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0089] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 140:

[0090] After the second shielding conductor structure 140 obtains the leakage signal, the third transistor Q3 is turned on, forming a conduction path of the second current-carrying line 120 - the second shielding conductor structure 140 - the third diode D3 - the third transistor Q3 - the sixteenth resistor R16 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0091] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0092] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0093] 3. When the portion of the first shielding conductor structure 130 between the first end a and the third end c is open:

[0094] The shorting path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer shorted. The two ends of the fourth resistor R4 are still shorted, and the fourth resistor R4 is shorted by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d exists simultaneously.

[0095] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0096] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0097] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0098] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0099] 4. When the portion of the first shielding conductor structure 130 between the second end b and the third end c is open:

[0100] The shorting path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer shorted. The two ends of the first resistor R1 are still shorted, and the first resistor R1 is shorted by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0101] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0102] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0103] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0104] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0105] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0106] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited;

[0107] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0108] The first transistor Q1 and the second transistor Q2 are both turned on; forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first transistor Q1 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the fifth resistor R5 - the second transistor Q2 - the tenth resistor R10 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0109] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0110] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0111] 6. When the portion of the second shielding conductor structure 140 between the fourth end d and the sixth end f is open:

[0112] The shorting path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer shorted. The two ends of the fourth resistor R4 are still shorted, and the fourth resistor R4 is shorted by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0113] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0114] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0115] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0116] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0117] 7. When the portion of the second shielding conductor structure 140 between the fifth end e and the sixth end f is open:

[0118] The shorting path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer shorted. The two ends of the first resistor R1 are still shorted, and the first resistor R1 is shorted by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d also exists.

[0119] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0120] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0121] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0122] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0123] 8. When the test switch TEST1 is pressed:

[0124] The test switch TEST1 simulates the leakage signal of the second current-carrying line 120 and transmits it to the first shielding conductor structure 130 or the second shielding conductor structure 140 :

[0125] After the first shielding conductor structure 130 or the second shielding conductor structure 140 obtains the leakage signal, the third transistor Q3 is turned on, forming a conductive path of the second current-carrying line 120 - tripping coil Lx - test switch TEST1 - first shielding conductor structure 130 / second shielding conductor structure 140 - third diode D3 - third transistor Q3 - sixteenth resistor R16 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0126] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0127] The trip coil Lx generates a strong electromagnetic force, thereby driving the trip module 230 to disconnect the power connection between the input end and the output end of the power line.

[0128] In addition, the operation of the detection and protection device provided in the embodiment of the present application under various leakage and open circuit conditions is described using the embodiment shown in FIG8 :

[0129] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 130:

[0130] After the first shielding conductor structure 130 obtains the leakage signal, it transmits it to the sixth terminal f, thereby causing the voltage stabilizing unit ZD1 to break down, forming a conductive path of the first current-carrying line 110 - the first shielding conductor structure 130 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0131] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0132] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0133] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 140:

[0134] After the second shielding conductor structure 140 obtains the leakage signal, it transmits it to the sixth terminal f, thereby causing the voltage stabilizing unit ZD1 to break down, forming a conductive path of the second current-carrying line 120 - the second shielding conductor structure 140 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0135] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0136] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0137] 3. When the portion of the first shielding conductor structure 130 between the first end a and the third end c is open:

[0138] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit formed by the first resistor R1 and the seventeenth resistor R17 connected in series are no longer short-circuited; the two ends of the second bias unit formed by the fourth resistor R4 and the eighteenth resistor R18 connected in series are still short-circuited, and the second bias unit is short-circuited by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d exists simultaneously.

[0139] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - seventeenth resistor R17 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0140] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0141] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0142] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0143] 4. When the portion of the first shielding conductor structure 130 between the second end b and the third end c is open:

[0144] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit formed by the fourth resistor R4 and the eighteenth resistor R18 connected in series are no longer short-circuited. The two ends of the first bias unit formed by the first resistor R1 and the seventeenth resistor R17 connected in series are still short-circuited, and the first bias unit is short-circuited by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0145] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - eighteenth resistor R18 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0146] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0147] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0148] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0149] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0150] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit formed by the first resistor R1 and the seventeenth resistor R17 connected in series are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit formed by the fourth resistor R4 and the eighteenth resistor R18 connected in series are no longer short-circuited;

[0151] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - seventeenth resistor R17 - third resistor R3 - first diode D1 - first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - eighteenth resistor R18 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0152] The first transistor Q1 and the second transistor Q2 are both turned on; forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the second resistor R2 - the first transistor Q1 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110, and forming a conducting path of the second current-carrying line 120 - the tripping coil Lx - the fifth resistor R5 - the second transistor Q2 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0153] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0154] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0155] 6. When the portion of the second shielding conductor structure 140 between the fourth end d and the sixth end f is open:

[0156] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit formed by the first resistor R1 and the seventeenth resistor R17 connected in series are no longer short-circuited; the two ends of the second bias unit formed by the fourth resistor R4 and the eighteenth resistor R18 connected in series are still short-circuited, and the second bias unit is short-circuited by the conductive path from the second end b to the third end c to the sixth end f to the fifth end e. It should be noted that the conductive path from the first end a to the third end c to the sixth end f to the fifth end e exists simultaneously.

[0157] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - seventeenth resistor R17 - third resistor R3 - first diode D1 - first current-carrying line 110 ;

[0158] The first transistor Q1 is turned on, and the second transistor Q2 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first transistor Q1 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0159] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0160] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0161] 7. When the portion of the second shielding conductor structure 140 between the fifth end e and the sixth end f is open:

[0162] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit formed by the fourth resistor R4 and the eighteenth resistor R18 connected in series are no longer short-circuited. The two ends of the first bias unit formed by the first resistor R1 and the seventeenth resistor R17 connected in series are still short-circuited, and the first bias unit is short-circuited by the conductive path from the first end a to the third end c to the sixth end f to the fourth end d. It should be noted that the conductive path from the second end b to the third end c to the sixth end f to the fourth end d also exists.

[0163] A conductive path is formed: second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - eighteenth resistor R18 - sixth resistor R6 - first diode D1 - first current-carrying line 110 ;

[0164] The second transistor Q2 is turned on, and the first transistor Q1 remains turned off; forming a conductive path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - second transistor Q2 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0165] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0166] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0167] 8. When the open circuit detection unit 211 works normally and the first shielding conductor structure 130 and the second shielding conductor structure 140 do not have an open circuit:

[0168] The potential on the first shielding conductor structure 130 and the second shielding conductor structure 140 is determined by a series voltage division performed by a first equivalent resistance formed by connecting the second resistor R2 and the fifth resistor R5 in parallel, and a second equivalent resistance formed by connecting the third resistor R3 and the sixth resistor R6 in parallel, and is at a level that will not cause the voltage stabilizing unit ZD1 to break down.

[0169] At this time, if the test switch TEST1 is pressed, it is equivalent to connecting the eighth resistor R8 in parallel with the second resistor R2 and the fifth resistor R5, so that the first equivalent resistance becomes smaller, causing the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 to increase, which will cause the voltage stabilizing unit ZD1 to break down, forming a conductive path of the second current-carrying line 120 - tripping coil Lx - test switch TEST1 - eighth resistor R8 - first shielding conductor structure 130 / second shielding conductor structure 140 - eleventh resistor R11 - voltage stabilizing unit ZD1 - tenth resistor R10 - seventh resistor R7 - first diode D1 - first current-carrying line 110;

[0170] The voltage of the control electrode of the thyristor Q4 increases. When the AC power reaches the negative half cycle, that is, the voltage level of the second current-carrying line 120 is greater than the voltage level of the first current-carrying line 110, the thyristor Q4 is turned on, forming a strong current path of the second current-carrying line 120 - tripping coil Lx - thyristor Q4 - first diode D1 - first current-carrying line 110.

[0171] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 230 to disconnect the power connection between the input end and the output end of the power line.

[0172] 9. When the open circuit detection unit 211 fails, such as a single device is open or short-circuited, the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 will change, which will lead to two situations. One is that the increase in the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 directly causes the voltage stabilizing unit ZD1 to be broken down, resulting in tripping; the other is that the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 decreases, resulting in the user actively pressing the test switch TEST1 for testing without triggering tripping.

[0173] The following lists various single device failures that may occur in the open circuit detection unit 211:

[0174] 9.1. When an open circuit fault occurs in the second resistor R2 in the open circuit detection unit 211, the first equivalent resistance increases, causing the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 to drop, and the voltage stabilizing unit ZD1 remains in an unbreakdowned state;

[0175] It should be noted that, in this case, the open circuit detection unit 211 cannot trigger tripping in response to a partial open circuit condition of the first shielding conductor structure 130 between the first end a and the third end c, but can still trigger tripping in response to four open circuit conditions: a partial open circuit of the first shielding conductor structure 130 between the second end b and the third end c, an open circuit of the connecting conductor between the third end c and the sixth end f, a partial open circuit of the second shielding conductor structure 140 between the fourth end d and the sixth end f, and a partial open circuit of the second shielding conductor structure 140 between the fifth end e and the sixth end f.

[0176] It can be seen that in this case, if a partial open circuit occurs between the first end a and the third end c of the first shielding conductor structure 130 , the user cannot discover it, which may pose a safety hazard.

[0177] 9.2. When an open circuit fault occurs in the fifth resistor R5 in the open circuit detection unit 211, the situation is similar to the situation when an open circuit fault occurs in the second resistor R2 in 9.1.

[0178] 9.3. When an open circuit fault occurs in the third resistor R3 in the open circuit detection unit 211, the second equivalent resistance decreases, causing the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 to increase, causing the voltage stabilizing unit ZD1 to break down and trigger a trip.

[0179] 9.4. When an open circuit fault occurs in the sixth resistor R6 in the open circuit detection unit 211, the situation is similar to the situation when an open circuit fault occurs in the third resistor R3 in 9.3.

[0180] 9.5. When an open circuit fault occurs in the first transistor Q1 in the open circuit detection unit 211, the open circuit detection unit 211 cannot trigger a trip in response to the partial open circuit condition of the first shielding conductor structure 130 between the first end a and the third end c;

[0181] It can be seen that in this case, if a partial open circuit occurs between the first end a and the third end c of the first shielding conductor structure 130 , the user cannot discover it, which may pose a safety hazard.

[0182] 9.6. When an open circuit fault occurs in the second transistor Q2, the seventeenth resistor R17, and the eighteenth resistor R18 in the open circuit detection unit 211, the situation is similar to the situation in which the first transistor Q1 has an open circuit fault in 9.5.

[0183] 9.7. When a short circuit occurs in the second resistor R2 in the open circuit detection unit 211, the first equivalent resistance becomes zero, causing the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 to increase, causing the voltage stabilizing unit ZD1 to break down and trigger a trip.

[0184] 9.8. When a short circuit fault occurs in the fifth resistor R5 in the open circuit detection unit 211, the situation is similar to the situation in which a short circuit fault occurs in the second resistor R2 in 9.7.

[0185] 9.9. When a short circuit occurs in the third resistor R3 in the open circuit detection unit 211, the second equivalent resistance becomes zero, causing the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 to drop, and the voltage stabilizing unit ZD1 remains in an unbroken state.

[0186] 9.10. When a short circuit fault occurs in the sixth resistor R6 in the open circuit detection unit 211, the situation is similar to the situation in which a short circuit fault occurs in the third resistor R3 in 9.9.

[0187] 9.11. When a short circuit fault occurs in the first transistor Q1 in the open circuit detection unit 211, the voltage of the control electrode of the thyristor Q4 will increase and trigger a trip.

[0188] 9.12. When a short circuit fault occurs in the second transistor Q2 in the open circuit detection unit 211, the situation is similar to the short circuit fault in the first transistor Q1 in 9.11.

[0189] If a single component failure occurs in the open circuit detection units 211 of 9.3, 9.4, 9.7, 9.8, 9.11, and 9.12, the power cord will be tripped, so that the user will not continue to use the power cord.

[0190] For the single device failure of the various open circuit detection units 211 such as 9.1, 9.2, 9.5, 9.6, 9.9 and 9.10 mentioned above, no tripping will be triggered, and the user will not be able to discover it, which will pose a safety hazard; on this basis, if the user actively presses the test switch TEST1 for testing, the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 has been changed. After pressing the test switch TEST1, the potential of the first shielding conductor structure 130 and the second shielding conductor structure 140 is still not high enough to cause the voltage stabilizing unit ZD1 to be broken down and trigger tripping, so that the user can intuitively see that the tripping is not triggered after pressing the test switch TEST1, so that it can be judged that the detection protection device is abnormal and cannot play the role of leakage protection or cannot play the role of open circuit protection of the shielding structure, thereby stopping the use of the faulty product, further improving safety protection.

[0191] Figure 10 is a schematic diagram of the layout of the first board surface of a circuit board of an electrical connection device provided in one embodiment of the present application; Figure 11 is a schematic diagram of the layout of the second board surface of a circuit board of an electrical connection device provided in the present application corresponding to the embodiment shown in Figure 10. Additionally, Figure 12 is a schematic diagram of the layout of the first board surface of a circuit board of an electrical connection device provided in another embodiment of the present application; and Figure 13 is a schematic diagram of the layout of the second board surface of a circuit board of an electrical connection device provided in the present application corresponding to the embodiment shown in Figure 12.

[0192] 10 to 13 , in a circuit board of an electrical connection device provided in an embodiment of the present application, the circuit board located inside a housing 400 includes a first board surface 301 facing a plug conductor 410 and a second board surface 302 facing away from the plug conductor 410. It will be appreciated that the shape of the circuit board is not limited to that shown in FIG10 to 13 , and may also be an elliptical, rectangular, polygonal, or irregular shape similar to that shown in FIG10 to 13 .

[0193] As described above with reference to Figures 2 to 9 , the detection and protection device includes, in addition to the open circuit detection unit 211 , the leakage detection unit 212 , the drive module 220 , the trip module 230 , and the test module 250 including the test switch TEST1 , a reset button RESET is included. The reset button RESET includes a reset trigger rod RECFG that passes through the circuit board and is connected to the trip module 230 . Specifically:

[0194] As shown in FIG10 and FIG12 , the trip module 230 is disposed in the middle area of ​​the first panel 301 ; current-carrying conductors 260 are disposed on both sides of the trip module 230 for contacting the plug conductor 410 to obtain power;

[0195] As shown in FIG11 and FIG13 , the second board surface 302 is provided with a first area 310 located at the edge of the circuit board, and the open circuit detection unit 211 is provided in the first area 310 ;

[0196] As shown in Figure 10, the first board surface 301 is provided with a shielded conductor solder point 311 for welding and connecting the first shielded conductor structure 130 and / or the second shielded conductor structure 140 at a position corresponding to the first area 310; it should be noted that since the open circuit detection unit 211 is provided in the first area 310, that is, the open circuit detection unit 211 is provided adjacent to the four shielded conductor solder points 311, the open circuit detection unit 211 can process the electrical signal obtained from the four shielded conductor solder points 311 and output a signal to feed back to the driving module 220. The electrical signal transmitted from the four shielded conductor solder points 311 does not need to be transmitted over long distances, the circuit routing is simpler, and the anti-interference ability is stronger.

[0197] As shown in FIG11 and FIG13 , the test switch TEST1 and the reset button RESET are disposed in the middle area of ​​the second board surface 302 ; the leakage detection unit 212 and the driving module 220 are disposed in the area of ​​the second board surface 302 adjacent to the test switch TEST1 and the reset button RESET.

[0198] According to the circuit board of the electrical connection device provided by the embodiment of the present application, by setting the first area 310 for connecting to the shielded conductor structure of the power line 100 at the edge of the circuit board, that is, the shielded conductor solder point 311 is located at the edge of the circuit board, so that the welding process between the first shielded conductor structure 130 and the second shielded conductor structure 140 and the circuit board is simpler and convenient for wire management; the open circuit detection unit 211 is located in the first area 310, so that the circuit routing between the shielded conductor solder point 311 and the open circuit detection unit 211 is shorter and has stronger anti-interference ability, especially when there is a need to perform segmented detection on the first shielded conductor structure 130 and the second shielded conductor structure 140, there will be multiple connections between the open circuit detection unit 211 and the first shielded conductor structure 130 and the second shielded conductor structure 140. The distance between the contact point, the shielded conductor solder joint 311 and the open circuit detection unit 211 is shorter, which can make the circuit routing simpler; the open circuit detection unit 211 processes the open circuit condition of the first shielded conductor structure 130 and the second shielded conductor structure 140 and outputs an open circuit fault signal to the driving module 220, without setting multiple long circuit lines from the first area 310 to the driving module 220; the circuit layout of this embodiment, based on the fact that the trip module 230, the test switch TEST1 and the reset button RESET occupy the main position of the circuit board, reasonably allocates areas on the limited board space of the circuit board to arrange the open circuit detection unit 211, the leakage detection unit 212 and the driving module 220, which can not only simplify the routing and improve the anti-interference ability, but also minimize the size of the circuit board.

[0199] 11 and 13 , in the circuit board provided in some embodiments of the present application, the reset button RESET, the test switch TEST1 and the first area 310 are sequentially arranged along the longitudinal axis of the second board surface 302 .

[0200] It is understood that, taking the circuit board orientation shown in Figures 11 or 13 as an example, the vertical direction is the length direction of the second board surface 302. The test switch TEST1 is arranged in the middle of the second board surface 302 in the vertical direction, the reset button RESET is arranged above the test switch TEST1, and the first area 310 is located below the test switch TEST1.

[0201] 11 and 13 , in the circuit boards provided in some embodiments of the present application, the leakage detection unit 212 is located in the left area of ​​the test switch TEST1, and the driver module 220 is located in the left area of ​​the reset button RESET and adjacent to the leakage detection unit 212. The leakage detection unit 212 is in close proximity to the test switch TEST1, so that when the test switch TEST1 of the test module 250 is pressed, the transmission path of the leakage signal on the simulated first shielded conductor structure 130 and the second shielded conductor structure 140 is shortened, making wiring more convenient. The driver module 220 is in close proximity to the leakage detection unit 212, so that the path for the leakage fault signal output by the leakage detection unit 212 to be transmitted to the driver module 220 is shortened, making wiring more convenient.

[0202] It can be understood that since the test switch TEST1 and the reset button RESET are both located in the middle area in the vertical direction, the leakage detection unit 212 can also be set in the right area of ​​the test switch TEST1. Similarly, the driving module 220 is also correspondingly set in the right area of ​​the reset button RESET and adjacent to the leakage detection unit 212.

[0203] 10 and 12 , in the circuit boards provided in some embodiments of the present application, the current-carrying conductor 260 extends along the longitudinal axis of the first board surface 301 , and the end of the current-carrying conductor 260 away from the shielding conductor solder point 311 is a power contact end 261 for contacting the plug conductor 410 , and the end of the current-carrying conductor 260 close to the shielding conductor solder point 311 is a power output solder point 262 for welding the first current-carrying line 110 or the second current-carrying line 120 .

[0204] It is understood that the trip module 230 is located in the central area of ​​the first board surface 301, and the two current-carrying conductors 260 are located on either side of the trip module 230. This ensures that the forces on the two current-carrying conductors 260 are balanced when the trip module 230 is actuated to cause displacement or deformation. Furthermore, larger components such as the trip module 230 and the current-carrying conductors 260 are located on the first board surface 301 of the circuit board, while other smaller components of the detection and protection device that require electrical connection via the printed circuit board are located on the second board surface 302 of the circuit board. This allows for better routing and simplifies circuit wiring. Furthermore, the power output solder point 262 is located near the first area 310, eliminating the need for the first and second current-carrying wires 110, 120 to extend too far on the circuit board when soldered to the current-carrying conductors 260.

[0205] It should be noted that when the reset trigger rod RECFG of the reset button RESET is pressed, the power contact end 261 of the current-carrying conductor 260 and the plug conductor 410 are in contact with each other, so that the mains power supply can be obtained.

[0206] In the circuit boards provided in some embodiments of the present application, the first shielding conductor structure 130 includes a first end a close to the circuit board, a second end b away from the first end a, and a third end c located between the first end a and the second end b; the second shielding conductor structure 140 includes a fourth end d close to the circuit board, a fifth end e away from the fourth end d, and a sixth end f located between the fourth end d and the fifth end e; the third end c is connected to the sixth end f; referring to Figure 10, the first area 310 is provided with four shielding conductor solder points 311 for connecting to the first end a, the second end b, the fourth end d, and the fifth end e, respectively.

[0207] It can be understood that since the open circuit detection unit 211 is respectively connected to the first end a, the second end b, the fourth end d, and the sixth end f, the first region 310 is provided with four shielded conductor solder joints 311 respectively connected to the first end a, the second end b, the fourth end d, and the fifth end e, as shown, for example, in FIG10 . After the first end a, the second end b, the fourth end d, and the fifth end e are connected to the four shielded conductor solder joints 311 of the first region 310, they are then electrically connected to the open circuit detection unit 211 via traces on the circuit board.

[0208] In some other embodiments of the present application, the first region 310 is further provided with two shielded conductor solder joints 311 for connecting to the third end c and the sixth end f, respectively. That is, the first region 310 is provided with a total of six shielded conductor solder joints 311, respectively for connecting to the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f. Specifically, as shown in FIG12 and FIG13 , three shielded conductor solder joints 311 are provided in the lower left and lower right corners of the first region 310, respectively.

[0209] Since the third end c and the sixth end f need to be electrically connected, in order to ensure a reliable electrical connection between the third end c and the sixth end f, two more shielding conductor solder joints 311 are provided in the first area 310 so that the third end c and the sixth end f can be connected to the circuit board and electrically connected through the circuit board.

[0210] 2 to 7 , in the circuit boards provided in some embodiments of the present application, the open circuit detection unit 211 includes a first switch unit 201 and a second switch unit 202 ; the first switch unit 201 includes a first transistor Q1 and a first resistor R1 for providing a turn-on voltage to the first transistor Q1 ; the second switch unit 202 includes a second transistor Q2 and a fourth resistor R4 for providing a turn-on voltage to the second transistor Q2 . Furthermore, the first switch unit 201 also includes a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the second current-carrying line 120, the other end of the second resistor R2 is connected to one end of the first resistor R1 and the emitter of the first transistor Q1, the other end of the first resistor R1 is connected to the base of the first transistor Q1 and one end of the third resistor R3, and the other end of the third resistor R3 is connected to the first current-carrying line 110; the second switch unit 202 also includes a fifth resistor R5 and a sixth resistor R6, one end of the fifth resistor R5 is connected to the second current-carrying line 120, the other end of the fifth resistor R5 is connected to one end of the fourth resistor R4 and the emitter of the second transistor Q2, the other end of the fourth resistor R4 is connected to the base of the second transistor Q2 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the first current-carrying line 110; the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected to the driving module 220. 8 and 9 , in the circuit board provided in some embodiments of the present application, the open circuit detection unit includes a first switch unit 201 and a second switch unit 202; the first switch unit 201 includes a first transistor Q1 and a first voltage divider unit; the second switch unit 202 includes a second transistor Q2 and a second voltage divider unit; the first voltage divider unit includes a second resistor R2, a first resistor R1, a seventeenth resistor R17, and a third resistor R3 connected in series in sequence, and the second voltage divider unit includes a fifth resistor R5, a fourth resistor R4, an eighteenth resistor R18, and a sixth resistor R6 connected in series in sequence; the connection point between the second resistor R2 and the first resistor R1 is connected to the shielding conductor solder joint corresponding to the first end a and the emitter of the first transistor Q1; the connection point between the first resistor R1 and the seventeenth resistor R17 ... emitter of the first transistor Q1; the connection point between the first connected to the base of the first transistor Q1; the connection point of the seventeenth resistor R17 and the third resistor R3 is connected to the shielded conductor welding point corresponding to the fourth end d; the connection point of the fifth resistor R5 and the fourth resistor R4 is connected to the shielded conductor welding point corresponding to the second end b and the emitter of the second transistor Q2; the connection point of the fourth resistor R4 and the eighteenth resistor R18 is connected to the base of the second transistor Q2; the connection point of the eighteenth resistor R18 and the sixth resistor R6 is connected to the shielded conductor welding point corresponding to the fifth end e; the second resistor R2 and the fifth resistor R5 are connected together and connected to the second current-carrying line 120, the third resistor R3 and the sixth resistor R6 are connected together and connected to the first current-carrying line 110; the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected to the driving module 220.It should be noted that the end of the second resistor R2 connected to the second current-carrying line 120 can be directly connected to the second current-carrying line 120, or it can be indirectly connected to the second current-carrying line 120 via a trip coil Lx as shown in Figures 2 to 9. Similarly, the end of the fifth resistor R5 connected to the second current-carrying line 120 can be directly connected to the second current-carrying line 120, or it can be indirectly connected to the second current-carrying line 120 via a trip coil Lx as shown in Figures 2 to 5. In addition, the end of the third resistor R3 connected to the first current-carrying line 110 can be directly connected to the first current-carrying line 110, or it can be indirectly connected to the first current-carrying line 110 via a first diode D1 as shown in Figures 2 to 9. Similarly, the end of the sixth resistor R6 connected to the first current-carrying line 110 can be directly connected to the first current-carrying line 110, or it can be indirectly connected to the first current-carrying line 110 via a first diode D1 as shown in Figures 2 to 9.

[0211] 11 , the first transistor Q1, the second transistor Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 in the embodiments shown in FIG2 to FIG7 are all arranged in the first region 310. Referring to FIG13 , the first transistor Q1, the second transistor Q2, the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventeenth resistor R17, and the eighteenth resistor R18 in the embodiments shown in FIG8 to FIG9 are all arranged in the first region 310.

[0212] It can be understood that in order to detect the open circuit conditions of the first shielding conductor structure 130 and the second shielding conductor structure 140, the open circuit detection unit 211 is provided with a large number of transistor components and resistor components, and the connection relationship is complex. Therefore, all components of the open circuit detection unit 211 are arranged in the first area 310, so that electrical connection with the shielding conductor solder joint 311 can be achieved through a shorter trace; concentrating the components contained in the open circuit detection unit 211 in one area can also help reduce the layout size required on the circuit board.

[0213] 5 to 7 , in the circuit board provided in some embodiments of the present application, the leakage detection unit 212 includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16 and a third transistor Q3; one end of the fourteenth resistor R14 is connected to the second current-carrying line 120, the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to any shielding conductor solder joint 311, the other end of the fifteenth resistor R15 is connected to the first current-carrying line 110, the collector of the third transistor Q3 is connected to one end of the sixteenth resistor R16, and the other end of the sixteenth resistor R16 is connected to the driving module 220. In addition, referring to Figure 9, in the circuit board provided in some embodiments of the present application, the leakage detection unit 212 includes a fourteenth resistor R14, a fifteenth resistor R15, a third transistor Q3 and a third diode D3, one end of the fourteenth resistor R14 is connected to the second current-carrying line 120, the other end of the fourteenth resistor R14 is connected to one end of the fifteenth resistor R15 and the base of the third transistor Q3, the emitter of the third transistor Q3 is connected to the cathode of the third diode D3, the anode of the third diode D3 is connected to the shielding conductor solder joint corresponding to the sixth end f, the other end of the fifteenth resistor R15 is connected to the first current-carrying line 110, and the collector of the third transistor Q3 is connected to the driving module 220. It should be noted that the end of the fourteenth resistor R14 connected to the second current-carrying line 120 can be directly connected to the second current-carrying line 120, or can be indirectly connected to the second current-carrying line 120 via the trip coil Lx as shown in Figures 5 to 7 and 9. The end of the fifteenth resistor R15 connected to the first current-carrying line 110 can be directly connected to the first current-carrying line 110, or can be indirectly connected to the first current-carrying line 110 via the first diode D1 as shown in Figures 5 to 7 and 9. Referring to Figure 11, the fourteenth resistor R14, the fifteenth resistor R15, the sixteenth resistor R16, and the third transistor Q3 in the embodiments shown in Figures 5 to 7 are all arranged in the second area 320 on the second board 302, located to the left of the test switch TEST1. Referring to Figure 13, the fourteenth resistor R14, the fifteenth resistor R15, the third transistor Q3, and the third diode D3 in the embodiments shown in Figures 9 to 7 are all arranged in the second area 320 on the second board 302, located to the left of the test switch TEST1.

[0214] It can be understood that the leakage detection unit 212 detects the leakage of the first shielding conductor structure 130 and the second shielding conductor structure 140 by using a transistor device in combination with a plurality of resistor devices. The components included in the leakage detection unit 212 are concentrated in the second area 320 on the left side of the test switch TEST1, which is conducive to reducing the layout size required for the leakage detection unit 212 on the circuit board.

[0215] 2 to 4 , in the circuit board provided in some embodiments of the present application, the leakage detection unit 212 includes an eleventh resistor R11 and a voltage stabilizing unit ZD1, the positive electrode of the voltage stabilizing unit ZD1 is connected to the driving module 220, the negative electrode of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to any shielding conductor solder point 311; the eleventh resistor R11 and the voltage stabilizing unit ZD1 are both arranged in the second area 320 on the second board surface 302, located on the left side of the test switch TEST1. In addition, referring to Figure 8, in the circuit board provided in some embodiments of the present application, the leakage detection unit 212 includes an eleventh resistor R11 and a voltage stabilizing unit ZD1, the positive pole of the voltage stabilizing unit ZD1 is connected to the driving module 220, the negative pole of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the shielding conductor solder joint corresponding to the sixth end f; the eleventh resistor R11 and the voltage stabilizing unit ZD1 are both arranged in the second area 320 on the second board surface 302, located on the left side of the test switch TEST1.

[0216] It can be understood that the leakage detection unit 212 detects the leakage of the first shielded conductor structure 130 and the second shielded conductor structure 140 by adopting the voltage stabilizing unit ZD1 in combination with the resistance element. The components included in the leakage detection unit 212 are concentrated in the second area 320 on the left side of the test switch TEST1, which is conducive to reducing the layout size required for the leakage detection unit 212 on the circuit board.

[0217] 2 to 7 , in the circuit boards provided in some embodiments of the present application, the driving module 220 includes a thyristor Q4, a seventh resistor R7, a tenth resistor R10, and a first capacitor C1. The detection and protection device also includes a trip coil Lx. The second current-carrying line 120 is connected to one end of the trip coil Lx, and the other end of the trip coil Lx is connected to the anode of the thyristor Q4. The control electrode of the thyristor Q4 is connected to one end of the seventh resistor R7, one end of the tenth resistor R10, one end of the first capacitor C1, and the leakage detection unit 212. The other end of the tenth resistor R10 is connected to the open circuit detection unit 211. The cathode of the thyristor Q4, the other end of the first capacitor C1, and the other end of the seventh resistor R7 are all connected to the first current-carrying line 110. It should be noted that the cathode of the thyristor Q4, the first capacitor C1, and the seventh resistor R7 are connected to one end of the first current-carrying line 110. They may be directly connected to the first current-carrying line 110 or indirectly connected to the first current-carrying line 110 via the first diode D1 as shown in FIG. 5 to FIG. 7 . 11 and 13 , the thyristor Q4 , the seventh resistor R7 , the tenth resistor R10 and the first capacitor C1 are all arranged in the third area 330 on the left side of the reset button RESET on the second board surface 302 .

[0218] It can be understood that in order to respond to the open circuit fault signal output by the open circuit detection unit 211 and the leakage fault signal transmitted by the leakage detection unit 212, the driving module 220 adopts thyristor devices, capacitors and multiple resistor devices, and the components contained in the driving module 220 are concentrated in the third area 330 to the left of the reset button RESET, which is conducive to reducing the layout size required for the driving module 220 on the circuit board.

[0219] In addition, referring to Figures 8 and 9, in the circuit boards provided in some embodiments of the present application, the test module 250 further includes an eighth resistor R8, one end of the test switch TEST1 is connected to the connection point between the second resistor R2 and the fifth resistor R5, the other end of the test switch TEST1 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the shielded conductor solder joint corresponding to the third end c; as shown in Figure 13, the eighth resistor R8 is arranged in the middle area of ​​the second board surface 302 and is adjacent to the test switch TEST1.

[0220] In the circuit boards provided in some embodiments of the present application, the length dimension range of the circuit board is 56mm±10mm, and the width dimension range is 36mm±10mm; the length dimension range of the first area 310 is 30mm±3mm, and the width dimension range is 8.5mm±10mm; the length dimension range of the arrangement area of ​​the leakage detection unit 212 on the second board surface 302 is 10mm±3mm, and the width dimension range is 8mm±3mm; the length dimension range of the arrangement area of ​​the driving module 220 on the second board surface 302 is 15mm±3mm, and the width dimension range is 10mm±3mm.

[0221] It is understandable that the detection and protection devices shown in Figures 2 to 9 require a large number of switching devices, diodes, resistors, capacitors, and the like to detect leakage and open circuit conditions in the shielded conductor structure of the power line. The circuit board provided in this embodiment of the present application, while the trip module 230, test switch TEST1, and reset button RESET occupy primary space on the circuit board, rationally allocates area within the limited board space for the open circuit detection unit 211, leakage detection unit 212, and driver module 220. This simplifies wiring, improves anti-interference capabilities, and minimizes the size of the circuit board.

[0222] Referring to Figure 10 , in the circuit boards provided in some embodiments of the present application, the first varistor ZR1 in the lightning protection unit 270 is disposed in the middle region of the first board surface 301 corresponding to the first region 310. Two shielded conductor solder joints 311 are disposed on either side of the first varistor ZR1. Referring to Figure 12 , three shielded conductor solder joints 311 are disposed on either side of the first varistor ZR1.

[0223] It can be understood that the first varistor ZR1 in the lightning protection unit 270 is relatively large in size, and is set in the middle area of ​​the first board surface 301 corresponding to the position of the first area 310, thereby dividing the four shielding conductor solder points 311 into twos, avoiding the four shielding conductor solder points 311 being set in a smaller area, which causes welding difficulties.

[0224] In addition, referring to Figures 10 and 12 , the second varistor ZR2 is located to the left of the trip module 230 on the first panel 301. Referring to Figures 11 and 13 , the freewheeling module, consisting of the first diode D1 and the second diode D2 in the detection and protection device, is located to the right of the test module 250 on the second panel 302. Furthermore, referring to Figures 11 and 13 , a solder joint for the trip coil Lx may also be located below the test module 250 on the second panel 302.

[0225] It should be noted that in Figures 10 to 13 of the present application, the placement of components in each module can be interchanged, and Figures 10 to 13 only illustrate one layout form.

[0226] According to the circuit board provided in some embodiments of the present application, the components in the open circuit detection unit 211, the leakage detection unit 212, the driving module 220 and the tripping module 230 are packaged using surface mount packaging or plug-in packaging.

[0227] According to the circuit boards provided in some embodiments of the present application, the circuit boards adopt a single-sided board, a double-sided board or a multi-layer board routing method.

[0228] According to the circuit boards provided in some embodiments of the present application, the circuit boards are processed by wave soldering, reflow soldering or manual methods.

[0229] In addition, the second embodiment of the present application provides an electrical connection device, including a circuit board as described in the first embodiment above, a power cord 100, a detection and protection device arranged on the circuit board and connected to the power cord 100, and a shell 400 that wraps the circuit board; the shell 400 is provided with a plug conductor 410 for connecting to a power supply.

[0230] According to the electrical connection device provided in some embodiments of the present application, a wire clip for clamping the power cord 100 is provided at the connection between the housing 400 and the power cord 100;

[0231] It is understandable that by providing a line clip to fix the power line 100 , it is possible to prevent the power line 100 from being easily dragged by external forces, thereby preventing the ports connected to the detection and protection device from falling off.

[0232] The first shielding conductor structure 130 includes a first end a close to the circuit board, a second end b away from the first end a, and a third end c located between the first end a and the second end b; the second shielding conductor structure 140 includes a fourth end d close to the circuit board, a fifth end e away from the fourth end d, and a sixth end f located between the fourth end d and the fifth end e;

[0233] The third terminal c and the sixth terminal f are electrically connected in one of the following three situations:

[0234] Case 1: Solder connection at the line card;

[0235] Case 2: Welding connection inside the housing 400;

[0236] Case 3: Connecting to the shield conductor solder joint 311 to achieve electrical connection through the circuit board.

[0237] It can be understood that the connection position of the third end c of the first shielding conductor structure 130 and the sixth end f of the second shielding conductor structure 140 can be flexibly set at different positions according to actual conditions. For example, in case one, when it is set at the line card, the line card can clamp the welding part of the third end c and the sixth end f while clamping the power cord 100, so as to prevent the welding part from loosening and falling off easily; in case two, when it is set inside the shell 400, the welding connection space between the third end c and the sixth end f is larger and easy to operate; in case three, when it is connected to the shielding conductor solder point 311, the third end c and the sixth end f are welded to the circuit board together with the first end a, the second end b, the fourth end d and the fifth end e, which can make the connection between the circuit board and the first shielding conductor structure 130 and the second shielding conductor structure 140 more stable and reliable, and the electrical connection between the third end c and the sixth end f through the circuit board can also be more reliable, and it is not easy to be disconnected.

[0238] The embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present application.

Claims

1. A circuit board for an electrical connection device, wherein: The electrical connection device comprises a power line, a detection protection device arranged on the circuit board and connected to the power line, and a shell wrapping the circuit board; the shell is provided with a plug conductor for connecting to a power source; 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 detection protection device includes an open circuit detection unit, a leakage detection unit, a drive module, a trip module, a test module including a test switch, and a reset button; The circuit board comprises a first board surface facing the plug conductor and a second board surface away from the plug conductor; The trip module is arranged in the middle area of ​​the first panel; current-carrying conductors for contacting and pressing with the plug conductor to obtain power are arranged on both sides of the trip module; The second board surface is provided with a first area located at the edge of the circuit board, the open circuit detection unit is provided in the first area, and the first board surface is provided with a shielding conductor welding point for welding and connecting the first shielding conductor structure and / or the second shielding conductor structure at a position corresponding to the first area; as well as The test switch and the reset button are arranged in the middle area of ​​the second board surface; the leakage detection unit and the driving module are arranged in the area of ​​the second board surface adjacent to the test switch and the reset button.

2. The circuit board according to claim 1, wherein: The reset button, the test switch and the first area are arranged in sequence along the longitudinal axis of the second panel.

3. The circuit board according to claim 2, wherein: The leakage detection unit is located in the left area of ​​the test switch, and the driving module is located in the left area of ​​the reset button and is adjacent to the leakage detection unit; or, The leakage detection unit is located in a right area of ​​the test switch, and the driving module is located in a right area of ​​the reset button and is adjacent to the leakage detection unit.

4. The circuit board according to claim 2 or 3, wherein: The current-carrying conductor extends along the longitudinal axis of the first board surface, and the end of the current-carrying conductor away from the shielding conductor solder joint is a power contact end for contacting the plug conductor, and the end of the current-carrying conductor close to the shielding conductor solder joint is a power output solder joint for welding the first current-carrying line or the second current-carrying line.

5. The circuit board according to any one of claims 1 to 4, wherein: The first shielding conductor structure includes a first end close to the circuit board, a second end away from the first end, and a third end located between the first end and the second end; the second shielding conductor structure includes a fourth end close to the circuit board, a fifth end away from the fourth end, and a sixth end located between the fourth end and the fifth end; the third end is connected to the sixth end; the first area is provided with four shielding conductor solder joints respectively used to connect to the first end, the second end, the fourth end, and the fifth end.

6. The circuit board according to claim 5, wherein: The first region is further provided with two shielding conductor welding points for connecting to the third end and the sixth end respectively.

7. The circuit board according to any one of claims 1 to 6, wherein: The open circuit detection unit includes a first switch unit and a second switch unit; the first switch unit includes a first transistor and a first resistor providing a turn-on voltage for the first transistor; the second switch unit includes a second transistor and a fourth resistor providing a turn-on voltage for the second transistor; as well as in: Two ends of the first resistor are electrically connected to shielded conductor welding points corresponding to the first end and the fourth end, respectively, and two ends of the fourth resistor are electrically connected to shielded conductor welding points corresponding to the second end and the fifth end, respectively; or, Two ends of the first resistor are electrically connected to shielded conductor solder joints corresponding to the first end and the fifth end, respectively, and two ends of the fourth resistor are electrically connected to shielded conductor solder joints corresponding to the second end and the fourth end, respectively.

8. The circuit board according to claim 7, wherein: The first switch unit further includes a second resistor and a third resistor, one end of the second resistor is connected to the second current-carrying line, the other end of the second resistor is connected to one end of the first resistor and the emitter of the first transistor, the other end of the first resistor is connected to the base of the first transistor and one end of the third resistor, and the other end of the third resistor is connected to the first current-carrying line; the second switch unit further includes a fifth resistor and a sixth resistor, one end of the fifth resistor is connected to the second current-carrying line, the other end of the fifth resistor is connected to one end of the fourth resistor and the emitter of the second transistor, the other end of the fourth resistor is connected to the base of the second transistor and one end of the sixth resistor, and the other end of the sixth resistor is connected to the first current-carrying line; The collector of the first transistor and the collector of the second transistor are connected to the driving module; The first transistor, the second transistor, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are all arranged in the first area.

9. The circuit board according to any one of claims 6 to 8, wherein: The open circuit detection unit includes a first switch unit and a second switch unit; The first switch unit includes a first transistor and a first voltage dividing unit; the first voltage dividing unit includes a second resistor, a first resistor, a seventeenth resistor and a third resistor connected in series in sequence; The second switch unit includes a second triode and a second voltage dividing unit; the second voltage dividing unit includes a fifth resistor, a fourth resistor, an eighteenth resistor and a sixth resistor connected in series in sequence; The connection point between the second resistor and the first resistor is connected to the shielding conductor welding point corresponding to the first end and the emitter of the first transistor; the connection point between the first resistor and the seventeenth resistor is connected to the base of the first transistor; the connection point between the seventeenth resistor and the third resistor is connected to the shielding conductor welding point corresponding to the fourth end; the connection point between the fifth resistor and the fourth resistor is connected to the shielding conductor welding point corresponding to the second end and the emitter of the second transistor; the connection point between the fourth resistor and the eighteenth resistor is connected to the base of the second transistor; the connection point between the eighteenth resistor and the sixth resistor is connected to the shielding conductor welding point corresponding to the fifth end; the second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line; The collector of the first transistor and the collector of the second transistor are connected to the driving module; as well as The first transistor, the second transistor, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventeenth resistor and the eighteenth resistor are all arranged in the first area.

10. The circuit board according to claim 9, wherein: The leakage detection unit includes a fourteenth resistor, a fifteenth resistor, a third transistor and a third diode, one end of the fourteenth resistor is connected to the second current-carrying line, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the base of the third transistor, the emitter of the third transistor is connected to the cathode of the third diode, the anode of the third diode is connected to the shielding conductor welding point corresponding to the sixth end, the other end of the fifteenth resistor is connected to the first current-carrying line, and the collector of the third transistor is connected to the driving module; and The fourteenth resistor, the fifteenth resistor, the third transistor and the third diode are all arranged in a second area on the second board surface and located on the left side of the test switch.

11. The circuit board according to claim 9 or 10, wherein: The leakage detection unit includes an eleventh resistor and a voltage stabilizing unit, wherein the positive electrode of the voltage stabilizing unit is connected to the driving module, the negative electrode of the voltage stabilizing unit is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to the shielding conductor welding point corresponding to the sixth end; and The eleventh resistor and the voltage stabilizing unit are both arranged in a second area on the second board surface and located on the left side of the test switch.

12. The circuit board according to claim 10 or 11, wherein: The test module further includes an eighth resistor, one end of the test switch is connected to a connection point between the second resistor and the fifth resistor, the other end of the test switch is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to a shield conductor welding point corresponding to the third end; as well as The eighth resistor is arranged in the middle area of ​​the second board surface and is disposed adjacent to the test switch.

13. The circuit board according to any one of claims 2 to 12, wherein: The leakage detection unit includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor and a third transistor, one end of the fourteenth resistor is connected to the second current-carrying line, the other end of the fourteenth resistor is connected to one end of the fifteenth resistor and the base of the third transistor, the emitter of the third transistor is connected to any one of the shielding conductor welding points, the other end of the fifteenth resistor is connected to the first current-carrying line, the collector of the third transistor is connected to one end of the sixteenth resistor, and the other end of the sixteenth resistor is connected to the driving module; the fourteenth resistor, the fifteenth resistor, the sixteenth resistor and the third transistor are all arranged in a second area on the second board surface located on the left side of the test switch.

14. The circuit board according to any one of claims 2 to 13, wherein: The leakage detection unit includes an eleventh resistor and a voltage stabilizing unit, the positive electrode of the voltage stabilizing unit is connected to the driving module, the negative electrode of the voltage stabilizing unit is connected to one end of the eleventh resistor, and the other end of the eleventh resistor is connected to any one of the shielded conductor solder joints; the eleventh resistor and the voltage stabilizing unit are both arranged in a second area on the second board surface located on the left side of the test switch.

15. The circuit board according to any one of claims 2 to 14, wherein: The driving module includes a thyristor, a seventh resistor, a tenth resistor and a first capacitor, the detection and protection device also includes a tripping coil, the second current-carrying line is connected to one end of the tripping coil, the other end of the tripping coil is connected to the anode of the thyristor, the control electrode of the thyristor is connected to one end of the seventh resistor, one end of the tenth resistor, one end of the first capacitor and the leakage detection unit, the other end of the tenth resistor is connected to the open circuit detection unit, the cathode of the thyristor, the other end of the first capacitor and the other end of the seventh resistor are all connected to the first current-carrying line; the thyristor, the seventh resistor, the tenth resistor and the first capacitor are all arranged in a third area on the second board surface located on the left side of the reset button.

16. The circuit board according to any one of claims 1 to 15, wherein: The length dimension range of the circuit board is 56mm±10mm, and the width dimension range is 36mm±10mm; the length dimension range of the first area is 30mm±3mm, and the width dimension range is 8.5mm±10mm; the length dimension range of the layout area of ​​the leakage detection unit on the second board surface is 10mm±3mm, and the width dimension range is 8mm±3mm; the length dimension range of the layout area of ​​the drive module on the second board surface is 15mm±3mm, and the width dimension range is 10mm±3mm.

17. The circuit board according to any one of claims 1 to 16, wherein: The components in the open circuit detection unit, the leakage detection unit, the driving module and the tripping module are packaged by chip or plug-in.

18. The circuit board according to any one of claims 1 to 17, wherein: The circuit board adopts a single-sided board, a double-sided board or a multi-layer board routing method.

19. The circuit board according to any one of claims 1 to 18, wherein: The circuit board is processed by wave soldering, reflow soldering or manual processing.

20. An electrical connection device, comprising the circuit board according to any one of claims 1 to 19, a power cord, a detection and protection device arranged on the circuit board and connected to the power cord, and a shell wrapping the circuit board, wherein the shell is provided with a plug conductor for connecting to a power supply.

21. The electrical connection device according to claim 20, wherein A wire clip for clamping the power line is provided at the connection between the housing and the power line; The first shielding conductor structure includes a first end close to the circuit board, a second end away from the first end, and a third end located between the first end and the second end; the second shielding conductor structure includes a fourth end close to the circuit board, a fifth end away from the fourth end, and a sixth end located between the fourth end and the fifth end; and The third end and the sixth end are electrically connected by one of the following three situations: Case 1: welding connection at the line card; Case 2: welding connection inside the shell; Case 3: Connecting to the shield conductor solder joint to achieve electrical connection through the circuit board.

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