Circuit board of electric connection equipment and electric connection equipment

Abstract

The utility model discloses a circuit board of an electric connection device and the electric connection device. The electric connection device comprises a power line and a detection protection device. The detection protection device comprises a fault response module, a trigger module and an overvoltage detection module, the circuit board comprises a first board surface and a second board surface, and the first board surface comprises a first area, a second area, a third area and a fourth area which are arranged in sequence; the second area is provided with a bonding pad for welding a current-carrying wire of a power line; the trigger module is arranged in the third area; the fault response module and the overvoltage detection module are arranged in the fourth area; the circuit board is provided with a plurality of through holes, the second board is provided with wires, and the first shielding conductor structure is electrically connected with the fault response module through the through holes and the wires. Therefore, the space utilization rate of the circuit board can be improved, the size of the circuit board is reduced, the wiring difficulty is reduced, the interference on an electric signal transmitted on the circuit board is reduced, and the overvoltage input by the power supply can be detected to trigger tripping.

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit board technical field especially relates to a circuit board and electric connection equipment of electric connection equipment. BACKGROUND

[0002] Leakage circuit detector interrupter (LCDI) is a kind of power supply connecting device for electric appliance, can detect the leakage current of power line group through leakage current detection line, and cut off the power supply connection of electric appliance when detecting certain leakage current, ensure safe use.In recent years, in addition to the need of leakage current detection interrupter to detect the leakage current of power line through leakage current detection line, higher safety detection demand is also proposed, for example, it is required to detect whether leakage current detection line exists open circuit condition.

[0003] At present, with the safety detection demand of power line detection protection device being higher and higher, the circuit module components included in detection protection device are more and more, therefore, the circuit board layout of electric connection equipment is also faced with more and more challenges, there are circuit board wiring difficulties, need to wind the situation, the electric signal transmitted on circuit board is also susceptible to interference, the size of circuit board required board surface is big and other problems;In addition, for the error voltage condition that 110V product accesses 220V voltage, product is easily burnt out. UTILITY MODEL CONTENTS

[0004] The utility model aims at at least solving one of the technical problems existing in prior art, provide a kind of circuit board and electric connection equipment of electric connection equipment, can improve the space utilization of circuit board, reduce the size of circuit board, reduce wiring difficulty, reduce the interference suffered by the electric signal transmitted on circuit board, and can detect the overvoltage of power input and trigger tripping, it is beneficial to be able to improve the power supply safety of power line.

[0005] Firstly, the utility model embodiment provides a kind of circuit board of electric connection equipment, and the electric connection equipment includes power line, detection protection device being set to the circuit board and being electrically connected with the power line;

[0006] The power line includes first current-carrying wire, second current-carrying wire, first shielding conductor structure covering the first current-carrying wire and second shielding conductor structure covering the second current-carrying wire, and first shielding conductor structure is connected with the second shielding conductor structure;

[0007] The detection protection device comprises a fault response module, a trigger module and an overvoltage detection module, the overvoltage detection module is used to generate an overvoltage signal and output to the fault response module in case that an overvoltage between the first current-carrying line and the second current-carrying line is detected; the fault response module is electrically coupled to the first shielding conductor structure, the trigger module and the overvoltage detection module respectively;

[0008] The circuit board comprises a first board surface and a second board surface, the first board surface comprises a first region, a second region, a third region and a fourth region arranged in sequence;

[0009] The first region is further provided with a solder pad for soldering the first shielding conductor structure and the second shielding conductor structure;

[0010] The second region is provided with a solder pad for soldering the first current-carrying line and the second current-carrying line;

[0011] The trigger module is arranged in the third region;

[0012] The fault response module and the overvoltage detection module are arranged in the fourth region; the overvoltage detection module is adjacent to the fault response module and electrically connected;

[0013] The circuit board is further provided with a plurality of through holes, the second board surface is provided with a wire connecting at least two through holes, and the first shielding conductor structure and the fault response module are electrically connected through the through holes and the wire.

[0014] The circuit board of the electric connection equipment has at least the following beneficial effects: the detection protection device in the electric connection equipment needs to detect the leakage of the current-carrying wire and the open circuit of the shielding conductor structure of the current-carrying wire, so the detection protection device needs to be configured with a plurality of modules such as a fault response module, a trigger module and an overvoltage detection module, the first area of the circuit board is used as a connection area of the current-carrying wire in the power line, the second area is used as a connection area of the shielding conductor structure in the power line, a plurality of pads are arranged for welding the current-carrying wire and the shielding conductor structure, the trigger module is arranged in the third area and the fault response module is arranged in the fourth area, so that the trigger module and the fault response module are adjacent or have a short distance, the electric connection can be directly realized and the wiring is shortened, in the fourth area, the overvoltage detection module is adjacent to the fault response module and is electrically connected, so that the electric connection can also be directly realized and the wiring is shortened, the fault response module in the fourth area is far away from the pad for welding the first shielding conductor structure in the first area, so that the electric connection is realized through a plurality of through holes on the circuit board and the wiring arranged on the second board surface, the position layout of each module on the first board surface of the circuit board is combined with the wiring on the second board surface, the space utilization of the circuit board is greatly improved, so that the size of the circuit board is reduced, the wiring difficulty is reduced, the wiring basically does not need to be wound, the interference on the electric signal transmitted on the circuit board is reduced, and the power supply safety of the power line is improved.

[0015] According to some embodiments of the utility model, the detection protection device further includes a self-checking path module, the self-checking path module includes a first self-checking unit and a second self-checking unit, the first self-checking unit is electrically coupled between the first current-carrying wire and the first shielding conductor structure, and the second self-checking unit is electrically coupled between the second current-carrying wire and the second shielding conductor structure.

[0016] The first self-checking unit and the second self-checking unit are arranged in the first area.

[0017] According to some embodiments of the utility model, the circuit board is provided with a first through hole and a second through hole, the second board surface is provided with a first wiring, and the first board surface is provided with a second wiring.

[0018] The pad for welding the first shielding conductor structure, the first through hole, the first wiring, the second through hole, the second wiring and the fault response module are sequentially electrically connected.

[0019] wherein:

[0020] The first via is located in the first region and is adjacent to a pad to which the first shield conductor structure is soldered;

[0021] The second via is located in the second region near the third region;

[0022] The first trace connects the first via and the second via.

[0023] According to the circuit board provided by some embodiments of the present application, the second trace passes through the third region and extends to the fault response module in the fourth region, and the second trace is located at the edge of the third region.

[0024] According to the circuit board provided by some embodiments of the present application, the detection protection device further comprises a test module, and the test module comprises a test switch and a seventh resistor;

[0025] The second region is provided with a first pad for soldering the first current-carrying wire and a second pad for soldering the second current-carrying wire;

[0026] The seventh resistor is arranged in the third region, and the middle part of the third region is further provided with a first pressure area and a second pressure area for respectively pressing two ends of the test switch, the first pressure area is adjacent to and electrically connected to the second pad, and the second pressure area is adjacent to and electrically connected to one end of the seventh resistor.

[0027] According to the circuit board provided by some embodiments of the present application, the circuit board is provided with a third via and a fourth via, and the second board surface is provided with a third trace;

[0028] The other end of the seventh resistor, the third via, the third trace, the fourth via and the pad to which the second shield conductor structure is soldered are sequentially electrically connected;

[0029] wherein:

[0030] The third via is located in the third region and is adjacent to the other end of the seventh resistor;

[0031] The fourth via is located in the first region and is adjacent to a pad to which the second shield conductor structure is soldered;

[0032] The third trace connects the third via and the fourth via.

[0033] According to the circuit board provided by some embodiments of the present application, the fault response module comprises a third resistor, a fourth resistor and a first switch tube;

[0034] The second region is provided with a first pad for welding the first current-carrying wire and a second pad for welding the second current-carrying wire;

[0035] In the fourth region, one end of the third resistor, one end of the fourth resistor and the control pin of the first switch tube are adjacent and electrically connected;

[0036] One switch pin of the first switch tube is adjacent to and electrically connected with the trigger module;

[0037] The other switch pin of the first switch tube is connected with the second wire;

[0038] The third region is provided with a fifth wire electrically connected to the second pad, and the other end of the fourth resistor is electrically connected to the second pad through the fifth wire;

[0039] The other end of the third resistor is electrically connected to the first pad.

[0040] According to some embodiments of the utility model, the detection protection device further comprises a trip coil, the second region is provided with a seventh pad and an eighth pad for welding two ends of the trip coil;

[0041] The fourth region is further provided with an eighth wire, the circuit board is further provided with a fifth through hole, and the second board surface is provided with a ninth wire;

[0042] The other end of the third resistor, the eighth wire, the fifth through hole, the ninth wire, the eighth pad, the trip coil, the seventh pad and the first pad are sequentially electrically connected;

[0043] Among them:

[0044] The eighth wire and the fifth through hole are located in the fourth region, and the eighth wire extends along the edge of the fourth region;

[0045] The eighth wire connects the other end of the third resistor and the fifth through hole;

[0046] The ninth wire connects the fifth through hole and the eighth pad.

[0047] According to some embodiments of the utility model, the overvoltage detection module comprises a first voltage stabilizing tube adjacent to the fourth resistor, the positive electrode of the first voltage stabilizing tube is connected to the fifth wire, and the negative electrode is connected to the connection point of the third resistor and the fourth resistor.

[0048] The overvoltage detection module further comprises a second stabilizing tube adjacent to the first stabilizing tube, a negative electrode of the first stabilizing tube is connected to a positive electrode of the second stabilizing tube, and a negative electrode of the second stabilizing tube is connected to a connecting point of the third resistor and the fourth resistor.

[0049] The detection protection device further comprises a tripping coil, and the trigger module comprises a silicon controlled rectifier and a silicon controlled rectifier driving module.

[0050] The second region is provided with a first pad for welding the first current-carrying wire, a second pad for welding the second current-carrying wire, and seventh and eighth pads for welding two ends of the tripping coil;

[0051] The second region is further provided with a sixth wire, and the seventh pad and the first pad are electrically connected through the sixth wire;

[0052] The eighth pad is adjacent to and electrically connected to an anode of the silicon controlled rectifier;

[0053] In the third region, a cathode and a control electrode of the silicon controlled rectifier are adjacent to and electrically connected to the silicon controlled rectifier driving module.

[0054] The silicon controlled rectifier driving module comprises an eighth resistor, a ninth resistor and a first capacitor;

[0055] The third region is provided with a seventh wire, and a control electrode of the silicon controlled rectifier, one end of the eighth resistor, one end of the ninth resistor and one end of the first capacitor are electrically connected through the seventh wire;

[0056] The other end of the eighth resistor is adjacent to and electrically connected to the fault response module, specifically, the other end of the eighth resistor is adjacent to and electrically connected to one switch pin of the first switch tube;

[0057] The third region is further provided with a fifth wire electrically connected to the second pad, and the other end of the ninth resistor, the other end of the first capacitor and the cathode of the silicon controlled rectifier are electrically connected to the fifth wire.

[0058] The first shielding conductor structure comprises a first end close to an input end of the power line and a second end close to an output end of the power line; and the first region is provided with a third pad for welding the first end and a fourth pad for welding the second end.

[0059] The second shielding conductor structure comprises a fourth end close to an input end of the power line and a fifth end close to an output end of the power line; the first region is provided with a fifth pad for welding the fourth end and a sixth pad for welding the fifth end.

[0060] According to the circuit board provided by some embodiments of the present application, the first self-checking unit comprises a first resistor and a second resistor; and the second self-checking unit comprises a fifth resistor and a sixth resistor.

[0061] One end of the first resistor is adjacent to and electrically connected with the third pad, and the other end faces the second region.

[0062] One end of the second resistor is adjacent to and electrically connected with the fourth pad, and the other end faces the second region.

[0063] One end of the fifth resistor is adjacent to and electrically connected with the fifth pad, and the other end faces the second region.

[0064] One end of the sixth resistor is adjacent to and electrically connected with the sixth pad, and the other end faces the second region.

[0065] According to the circuit board provided by some embodiments of the present application, the detection protection device further comprises a tripping coil, the second region is provided with a first pad for welding the first current-carrying wire, a second pad for welding the second current-carrying wire, and a seventh pad and an eighth pad for welding two ends of the tripping coil.

[0066] The circuit board is further provided with a sixth through hole; and the second board face is provided with a tenth wire;

[0067] The other end of the first resistor and the other end of the second resistor, the sixth through hole, the tenth wire, the eighth pad, the tripping coil, the seventh pad and the first pad are sequentially electrically connected.

[0068] Among them:

[0069] The sixth through hole is located in the first region and is adjacent to and electrically connected with the other end of the first resistor and the other end of the second resistor.

[0070] The tenth wire connects the sixth through hole and the eighth pad.

[0071] According to the circuit board provided by some embodiments of the present application, the circuit board is further provided with a seventh through hole and an eighth through hole, the third region is provided with a fifth wire, and the second board face is provided with an eleventh wire.

[0072] The other end of the fifth resistor and the other end of the sixth resistor, the seventh via hole, the eleventh trace, the eighth via hole, the fifth trace, and the second pad are sequentially electrically connected;

[0073] Wherein:

[0074] The seventh via hole is located in the first region and is adjacent to and electrically connected to the other end of the fifth resistor and the other end of the sixth resistor;

[0075] The eighth via hole is located in the third region;

[0076] The fifth trace connects the eighth via hole and the second pad;

[0077] The eleventh trace connects the seventh via hole and the eighth via hole.

[0078] According to some embodiments of the utility model, the detection protection device further comprises a first unidirectional conduction module arranged in the first region, and the first unidirectional conduction module comprises a first diode and a second diode;

[0079] The first region is provided with a twelfth trace connecting the third pad and an anode of the first diode;

[0080] The anode of the second diode is adjacent to and electrically connected to the fourth pad;

[0081] The cathode of the first diode and the cathode of the second diode are both electrically connected to the first via hole.

[0082] According to some embodiments of the utility model, the second shielding conductor structure comprises a fourth end close to an input end of the power line and a fifth end close to an output end of the power line; the first region is provided with a fifth pad for welding the fourth end and a sixth pad for welding the fifth end;

[0083] The detection protection device further comprises a second unidirectional conduction module arranged in the first region, and the second unidirectional conduction module comprises a third diode and a fourth diode;

[0084] The anode of the third diode is adjacent to and electrically connected to the fifth pad;

[0085] The first region is provided with a thirteenth trace connecting the sixth pad and an anode of the fourth diode;

[0086] The cathode of the third diode and the cathode of the fourth diode are both electrically connected to the fourth via hole.

[0087] The circuit board provided by some embodiments of the present utility model, the trigger module includes fifth diode and sixth diode;

[0088] The anode of the fifth diode and the anode of the sixth diode are connected with the fifth wire;

[0089] The cathode of the fifth diode is connected with the second pad;

[0090] The cathode of the sixth diode is connected with the eighth wire.

[0091] The circuit board provided by some embodiments of the present utility model, the trigger module further includes first voltage-dependent resistor adjacent to the sixth diode, and two ends of the first voltage-dependent resistor are connected with the fifth wire and the eighth wire respectively.

[0092] The detection protection device further includes lightning protection module, the lightning protection module includes second voltage-dependent resistor, the second region is provided with ninth pad and tenth pad for welding two pins of the second voltage-dependent resistor, the ninth pad is electrically connected with the sixth wire, and the tenth pad is adjacent to the second pad and is electrically connected.

[0093] The detection protection device further includes indication module arranged in the fourth region, the indication module includes tenth resistor, eleventh resistor and light-emitting diode, one end of the tenth resistor is connected to the eighth wire, and the other end is connected to one end of the eleventh resistor, and the fourth region is further provided with fourteenth wire connecting the other end of the eleventh resistor and one end of the light-emitting diode, and fifteenth wire connecting the other end of the light-emitting diode and the fifth wire.

[0094] In the second aspect, the utility model provides a kind of electric connection equipment, including the circuit board of the first aspect embodiment as above, power cord, detection protection device arranged in the circuit board and being connected with the power cord.

[0095] Other features and advantages of the present utility model will be set forth in the following description of the application, and in part will become apparent from the description, or be learned from practice of the present utility model. The purpose and other advantages of the present utility model can be achieved and obtained by the structure specially pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0096] The drawings are used to provide further understanding of the technical scheme of the present utility model, and constitute part of the specification, and are used to explain the technical scheme of the present utility model together with the embodiments of the present utility model, and do not constitute the limitation to the technical scheme of the present utility model.

[0097] The utility model is further illustrated below in combination with the drawings and embodiments;

[0098] Figure 1 It is each module's circuit schematic of the detection protection device of power cord provided by an embodiment of the utility model;

[0099] Figure 2 It is the layout schematic of the first board surface of the circuit board provided by an embodiment of the utility model;

[0100] Figure 3 It is the layout schematic of the second board surface of the circuit board provided by an embodiment of the utility model;

[0101] Figure 4 It is the layout schematic of the first through hole, the second through hole and the second wire of the circuit board provided by an embodiment of the utility model;

[0102] Figure 5 It is the layout schematic of the test switch, the seventh resistance, the third through hole, the fourth through hole of the circuit board provided by an embodiment of the utility model;

[0103] Figure 6 It is the layout schematic of the third resistance, the fourth resistance, the fifth wire, the second solder pad of the circuit board provided by an embodiment of the utility model;

[0104] Figure 7 It is the layout schematic of the silicon controlled rectifier, the silicon controlled rectifier drive module, the seventh solder pad, the eighth solder pad and the sixth wire of the circuit board provided by an embodiment of the utility model;

[0105] Figure 8 It is the layout schematic of the first resistance, the second resistance, the sixth through hole, the fifth resistance, the sixth resistance, the seventh through hole and the eighth through hole of the circuit board provided by an embodiment of the utility model;

[0106] Figure 9 It is the layout schematic of the first unidirectional conduction module and the second unidirectional conduction module of the circuit board provided by an embodiment of the utility model;

[0107] Figure 10 It is the layout schematic of the ninth solder pad and the tenth solder pad for welding the two pins of the second pressure sensitive resistance of the circuit board provided by an embodiment of the utility model;

[0108] Figure 11 It is the layout schematic of the indication module of the circuit board provided by an embodiment of the utility model;

[0109] Figure 12 It is the layout schematic of the overvoltage detection module of the circuit board provided by an embodiment of the utility model;

[0110] Figure 13 is a leakage signal flow direction schematic diagram under the leakage condition of the first current-carrying line provided by the embodiment of the utility model;

[0111] Figure 14 is a leakage signal flow direction schematic diagram under the leakage condition of the second current-carrying line provided by the embodiment of the utility model;

[0112] Figure 15 is an open circuit signal flow direction schematic diagram under the open circuit condition of the part between the first end and the third end of the first shielding conductor structure provided by the embodiment of the utility model;

[0113] Figure 16 is an open circuit signal flow direction schematic diagram under the open circuit condition of the part between the second end and the third end of the first shielding conductor structure provided by the embodiment of the utility model;

[0114] Figure 17 is an open circuit signal flow direction schematic diagram under the open circuit condition of the connecting conductor between the third end of the first shielding conductor structure and the sixth end of the second shielding conductor structure provided by the embodiment of the utility model;

[0115] Figure 18 is an open circuit signal flow direction schematic diagram under the open circuit condition of the part between the fourth end and the sixth end of the second shielding conductor structure provided by the embodiment of the utility model;

[0116] Figure 19 is an open circuit signal flow direction schematic diagram under the open circuit condition of the part between the fifth end and the sixth end of the second shielding conductor structure provided by the embodiment of the utility model;

[0117] Figure 20 is a simulated leakage signal flow direction schematic diagram under the condition that the test switch is pressed provided by the embodiment of the utility model;

[0118] Figure 21 is an electric signal flow direction schematic diagram under the condition that the voltage between the first current-carrying line and the second current-carrying line is too large provided by the embodiment of the utility model;

[0119] Figure 22 is a whole structure schematic diagram of the electric connection equipment provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0120] This part will describe the specific embodiments of the utility model in detail, the preferred embodiments of the utility model are shown in the drawings, the role of the drawings is to supplement the description of the text part with graphics, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the utility model, but it cannot be understood as the limitation of the protection scope of the utility model.

[0121] In the description of the embodiments of the utility model, if the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, "at least one" means one or more, "at least one of the following" and similar expressions mean any combination of these items, including single or multiple items. If there is a description of "first", "second", etc. is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0122] It should be noted that the words such as setting, installation and connection in the embodiments of the utility model should be understood broadly, and the skilled in the art can determine the specific meaning of the above words in the embodiments of the utility model in combination with the specific content of the technical scheme. For example, the term "connection" can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium.

[0123] It should be noted that the technical features involved in each embodiment of the utility model described below can be combined with each other as long as there is no conflict between them.

[0124] Leakage circuit detector interrupter (LCDI) is a power connection device for electrical appliances, which can detect the leakage current of the power line set through the leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected, to ensure safety. In recent years, in addition to detecting the leakage current of the power line through the leakage current detection line, the leakage circuit detector interrupter also has higher safety detection requirements, such as the need to detect whether the leakage current detection line is open.

[0125] At present, with the increasing safety detection requirements of the power line detection protection device, the circuit module of the detection protection device includes more and more components, therefore, the circuit board layout of the electrical connection device also faces more and more challenges, such as the difficulty of circuit board wiring, the need for winding, the easy interference of the electrical signal transmitted on the circuit board, the large size of the required board surface of the circuit board, etc. In addition, in the case of 110V product access to 220V voltage error voltage, the product is easily burned out.

[0126] Based on this, the utility model discloses a kind of circuit board and electric connection equipment of electric connection equipment, can improve the space utilization of circuit board, reduce the size of circuit board, reduce wiring difficulty, reduce the interference suffered by electric signal transmitted on circuit board, and can detect overvoltage of power input and trigger tripping, facilitate to improve the power supply safety of power line.

[0127] The utility model embodiment is further described below with reference to the drawings.

[0128] Figure 22 It is the overall structure schematic diagram of electric connection equipment provided by the utility model embodiment. Electric connection equipment includes power line 100, detection protection device being arranged in circuit board and being connected with power line 100, shell wrapping circuit board;Shell is provided with the insertion piece conductor for accessing power. Among them, since circuit board is located in the inside of shell, therefore, not shown in Figure 1 .

[0129] Figure 1 It is the circuit principle diagram of each module of the detection protection device of power line 100 provided by one embodiment of the utility model. Specifically,

[0130] Power line 100 includes first current-carrying wire 110, second current-carrying wire 120, first shielding conductor structure 221 covering first current-carrying wire 110 and second shielding conductor structure 222 covering second current-carrying wire 120, and first shielding conductor structure 221 is used to collect the leakage signal of first current-carrying wire 110, and second shielding conductor structure 222 is used to collect the leakage signal of second current-carrying wire 120. It can be understood that, when power line 100 supplies power to electric equipment using two-phase alternating current, it can be one of the following two cases: first current-carrying wire 110 is fire line L, and second current-carrying wire 120 is zero line N;First current-carrying wire 110 is zero line N, and second current-carrying wire 120 is fire line L. When power supply supplies power to electric equipment using three-phase alternating current, it can be one of the following three cases: first current-carrying wire 110 is fire line L1, and second current-carrying wire 120 is zero line N;First current-carrying wire 110 is zero line N, and second current-carrying wire 120 is fire line L1;First current-carrying wire 110 is fire line L1, and second current-carrying wire 120 is fire line L2. Below, with Figure 2The case shown, i.e., the case where the first current-carrying wire 110 is the fire wire L and the second current-carrying wire 120 is the zero wire N, is taken as an example for description, and the remaining cases can be obtained by analogy. In addition, the first shielding conductor structure 221 is connected with the second shielding conductor structure 222, specifically: the first shielding conductor structure 221 includes a first end a close to the input end of the power line 100, a second end b close to the output end of the power line 100, and a third end c between the first end a and the second end b; the second shielding conductor structure 222 includes a fourth end d close to the input end of the power line 100, a fifth end e close to the output end of the power line 100, and a sixth end f between the fourth end d and the fifth end e; the third end c and the sixth end f are connected. It can be understood that the first shielding conductor structure 221 in the leakage detection module 220 wraps the first current-carrying wire 110 so as to collect the leakage signal of the first current-carrying wire 110, and the second shielding conductor structure 222 in the leakage detection module 220 wraps the second current-carrying wire 120 so as to collect the leakage signal of the second current-carrying wire 120. On this basis, by connecting the third end c in the middle of the first shielding conductor structure 221 with the sixth end f in the second shielding conductor structure 222, an association point is formed between the shielding conductor structures of the first current-carrying wire 110 and the second current-carrying wire 120, and the two shielding conductor structures are no longer independent. The first shielding conductor structure 221 and the second shielding conductor structure 222 can construct a plurality of different detection paths for open circuit detection, for example, a detection path from the first end a of the first shielding conductor structure 221 to the third end c, to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; a detection path from the first end a of the first shielding conductor structure 221 to the third end c, to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222; a detection path from the second end b of the first shielding conductor structure 221 to the third end c, to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; and a detection path from the second end b of the first shielding conductor structure 221 to the third end c, to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222.

[0131] Continuing to refer to Figure 1 , the detection protection device includes a switching module 210, a self-checking path module 230, a fault response module 240, a triggering module 250, and an overvoltage detection module 290, specifically:

[0132] The switching module 210 is configured to control the electrical connection between the input end and the output end of the power line 100; refer to Figure 1As shown, the switch module 210 is provided with switch terminals on the first current-carrying line 110 and the second current-carrying line 120, when the switch terminals of the switch module 210 are closed, the power connection between the input end and the output end of the power supply line 100 is turned on; when the switch terminals of the switch module 210 are opened, the power connection between the input end and the output end of the power supply line is disconnected;

[0133] The self-checking path module 230 includes a first self-checking unit 231 and a second self-checking unit 232, the first self-checking unit 231 is electrically coupled between the first current-carrying line 110 and the first shielding conductor structure 221, and the second self-checking unit 232 is electrically coupled between the second current-carrying line 120 and the second shielding conductor structure 222, so that the first current-carrying line 110, the first self-checking unit 231, the first shielding conductor structure 221, the second shielding conductor structure 222, the second self-checking unit 232 and the second current-carrying line 120 electrically coupled in sequence constitute an open circuit self-checking path; It can be understood that the open circuit self-checking path formed by the first self-checking unit 231 and the second self-checking unit 232 in cooperation with the first shielding conductor structure 221, the second shielding conductor structure 222, the first current-carrying line 110 and the second current-carrying line 120 can perform open circuit detection on a plurality of different detection paths;

[0134] The fault response module 240 is electrically coupled to the self-checking path module 230 and the trigger module 250 respectively; more specifically, the fault response module 240 is electrically coupled to the connection point of the first self-checking unit 231 and the first shielding conductor structure 221, and outputs a trip trigger signal in response to obtaining a leakage signal or an open circuit signal generated when the open circuit self-checking path is open;

[0135] The overvoltage detection module 290 is electrically connected to the fault response module 240, and is used to generate an overvoltage signal and output to the fault response module 240 when it is detected that the voltage between the first current-carrying line 110 and the second current-carrying line 120 is too large, so that the fault response module 240 outputs a trip trigger signal;

[0136] The trigger module 250 is electrically coupled to the fault response module 240 and the switch module 210 respectively, and is configured to drive the switch module 210 to disconnect the power connection in response to receiving the trip trigger signal; more specifically, the trigger module 250 includes a thyristor Q2 and a thyristor drive module 251, and the detection protection device further includes a trip coil Lx for generating an electromagnetic force to drive the switch module 210 to disconnect the power connection, the first current-carrying line 110 is connected to one end of the trip coil Lx, the other end of the trip coil Lx is connected to the anode of the thyristor Q2, the cathode of the thyristor Q2 is electrically coupled to the second current-carrying line 120, and the thyristor drive module 251 is connected between the output end of the fault response module 240 and the control electrode of the thyristor Q2.

[0137] Figure 2The utility model provides a layout schematic view of the first board surface B10 of the circuit board for the embodiment of the utility model. Figure 3 The utility model provides a layout schematic view of the second board surface B20 of the circuit board for the embodiment of the utility model. Refer to Figure 2 And Figure 3 , the circuit board includes the first board surface B10 and the second board surface B20, and the first board surface B10 includes the first area B11, the second area B12, the third area B13 and the fourth area B14 arranged in sequence;In Figure 2 The first area B11, the second area B12, the third area B13 and the fourth area B14 are sequentially arranged from bottom to top in the placing direction shown;

[0138] The first self-checking unit 231 and the second self-checking unit 232 are arranged in the first area B11;The first area B11 is further provided with the solder pad for welding the first shielding conductor structure 221 and the second shielding conductor structure 222;Specifically, refer to Figure 2 The left side area of the first area B11 is provided with the third solder pad H03 for welding the first end a and the fourth solder pad H04 for welding the second end b;The third solder pad H03 is adjacent to the fourth solder pad H04, and the fourth solder pad H04 is located at the right side of the third solder pad H03, and the first self-checking unit 231 is located above the third solder pad H03 and the fourth solder pad H04;The right side area of the first area B11 is provided with the fifth solder pad H05 for welding the fourth end d and the sixth solder pad H06 for welding the fifth end e;The fifth solder pad H05 is adjacent to the sixth solder pad H06, and the sixth solder pad H06 is located at the right side of the fifth solder pad H05, and the second self-checking unit 232 is located above the fifth solder pad H05 and the sixth solder pad H06;

[0139] The second area B12 is provided with the solder pad for welding the first current-carrying wire 110 and the second current-carrying wire 120;Specifically, refer to Figure 2 The left side area of the second area B12 is provided with the first solder pad H01 for welding the first current-carrying wire 110, and the right side area of the second area B12 is provided with the second solder pad H02 for welding the second current-carrying wire 120;

[0140] The trigger module 250 is arranged in the third area B13;Specifically, refer to Figure 1 The trigger module 250 includes the silicon controlled drive module 251, the silicon controlled Q2, the first voltage-dependent resistor ZR1, the fifth diode D5 and the sixth diode D6, wherein, refer to Figure 2 The silicon controlled drive module 251 and the silicon controlled Q2 are located in the left side area of the third area B13, and the silicon controlled drive module 251 is located above the silicon controlled Q2, and the first voltage-dependent resistor ZR1, the fifth diode D5 and the sixth diode D6 are located in the right side area of the third area B13;

[0141] The fault response module 240 and the overvoltage detection module 290 are arranged in the fourth region B14, the overvoltage detection module 290 is adjacent to and electrically connected with the fault response module 240; specifically, referring to Figure 1 The fault response module 240 includes a third resistor R3, a fourth resistor R4 and a first switch tube Q1, the fault response module 240 is located at the left region of the fourth region B14 and is adjacent to the silicon controlled drive module 251 located in the third region B13.

[0142] The circuit board is also provided with a plurality of through holes, the second board surface B20 is provided with a wire connecting at least two through holes, and the self-checking path module 230 and the fault response module 240 are electrically connected through the through holes and the wire.

[0143] According to the circuit board of the electric connection equipment provided in the embodiment of the utility model, since the detection protection device in the electric connection equipment needs to detect the leakage of the current-carrying wire and the open circuit of the shielding conductor structure of the current-carrying wire, the detection protection device needs to be configured with more modules such as the self-checking path module 230, the fault response module 240, the trigger module 250 and the overvoltage detection module 290, the circuit board takes the first area B11 as the connection area of the current-carrying wire in the power line and takes the second area B12 as the connection area of the shielding conductor structure in the power line, a plurality of pads are arranged for welding the current-carrying wire and the shielding conductor structure, the first self-checking unit 231 and the second self-checking unit 232 in the self-checking path module 230 are arranged in the first area B11 and can be close to the pad welded by the shielding conductor structure needed to be electrically connected, so that the electric connection is directly realized and the wiring is shortened, the trigger module 250 is arranged in the third area B13 and the fault response module 240 is arranged in the fourth area B14, so that the trigger module 250 is adjacent to or spaced apart from the fault response module 240, the electric connection is directly realized and the wiring is shortened, in the fourth area B14, the overvoltage detection module 290 is adjacent to and electrically connected with the fault response module 240, so that the electric connection is directly realized and the wiring is shortened, the fault response module 240 in the fourth area B14 is far away from the self-checking path module 230 in the first area B11 and far away from the pad for welding the first shielding conductor structure 221 in the first area B11, so that the electric connection is realized through the plurality of through holes on the circuit board and the wiring arranged on the second board surface B20, the position layout of each module on the first board surface B10 of the circuit board in combination with the wiring on the second board surface B20 greatly improves the space utilization rate of the circuit board, so that the size of the circuit board is reduced, the wiring difficulty is reduced, the wiring basically does not need to be wound, the interference on the electric signal transmitted on the circuit board is reduced, in addition, the overvoltage detection module 290 is arranged, the overvoltage signal is output to the fault response module 240 in the case that the voltage between the first current-carrying wire 110 and the second current-carrying wire 120 is too large, the fault response module 240 outputs the tripping trigger signal to the trigger module 250, so that the product is prevented from being burnt due to overvoltage, and the power supply safety of the power line can be improved.

[0144] With reference to Figure 3 And Figure 4In the circuit board provided by some embodiments of the utility model, the circuit board is provided with a first through hole K01 and a second through hole K02, the first through hole K01 is located at the first area B11 and adjacent to the solder pad welded with the first shielding conductor structure 221, that is, the first through hole K01 is adjacent to the third solder pad H03 and the fourth solder pad H04, so that the electrical connection can be realized; it can be understood that the third solder pad H03 can be directly electrically connected with the first through hole K01, or indirectly electrically connected with the first through hole K01 through the first diode D1, and similarly, the fourth solder pad H04 can be directly electrically connected with the first through hole K01, or indirectly electrically connected with the first through hole K01 through the second diode D2;

[0145] The second through hole K02 is located at the position close to the third area B13 in the second area B12, that is, above the first solder pad H01;

[0146] The second plate surface B20 is provided with a first wiring X01, the first wiring X01 connects the first through hole K01 and the second through hole K02, and the direction of the first wiring X01 is shown in the figure Figure 3 ;

[0147] The first plate surface B10 is provided with a second wiring X02, the second wiring X02 connects the second through hole K02 and the fault response module 240, and the direction of the second wiring X02 is shown in the figure Figure 4 ;

[0148] The above setting of the first through hole K01, the second through hole K02, the first wiring X01 and the second wiring X02 on the circuit board makes the solder pad welded with the first shielding conductor structure 221, the first through hole K01, the first wiring X01, the second through hole K02, the second wiring X02 and the fault response module 240 electrically connected in sequence.

[0149] In the embodiment, when the first shielding conductor structure 221 detects the electric leakage signal, the signal can be transmitted to the first through hole K01 through the third solder pad H03 or the fourth solder pad H04, then transmitted to the second through hole K02 through the first wiring X01, and then transmitted to the fault response module 240 through the second wiring X02, so that the fault response module 240 outputs the tripping trigger signal to the trigger module 250.

[0150] Referring to Figure 4 In the circuit board provided by some embodiments of the utility model, the second wiring X02 passes through the third area B13 and extends to the fault response module 240 in the fourth area B14, and the second wiring X02 is located at the edge of the third area B13.

[0151] In the embodiment, the second trace X02 extends along the edge of the third region B13 to the fault response module 240 of the fourth region B14, so that the second trace X02 does not occupy the core region of the third region B13, avoids affecting the element layout of the third region B13, and can also avoid that the leakage signal transmitted on the second trace X02 receives other interference.

[0152] With reference to Figure 1 In the circuit board provided in some embodiments of the utility model, the detection protection device further comprises a test module 260, and the test module 260 comprises a test switch TEST and a seventh resistor R7.

[0153] With reference to Figure 5 The seventh resistor R7 is arranged at the middle part of the third region B13, and the middle part of the third region B13 is further provided with a first pressure area Tx-1 and a second pressure area Tx-2 for the two ends of the test switch TEST to press respectively, specifically, the seventh resistor R7 is located above the first pressure area Tx-1 and the second pressure area Tx-2, the first pressure area Tx-1 is located at the right side of the second pressure area Tx-2, the first pressure area Tx-1 is adjacent to and electrically connected with the second pad H02, and the second pressure area Tx-2 is adjacent to and electrically connected with one end of the seventh resistor R7.

[0154] With reference to Figure 5 The circuit board is provided with a third through hole K03 and a fourth through hole K04, the third through hole K03 is located at the third region B13 and adjacent to the other end of the seventh resistor R7, so that the other end of the seventh resistor R7 can be electrically connected directly.

[0155] The fourth through hole K04 is located at the first region B01 and adjacent to the pad welded with the second shielding conductor structure 222, that is, the fourth through hole K04 is adjacent to the fifth pad H05 and the sixth pad H06, so that the electrical connection can be realized, it can be understood that the fourth through hole K04 can be electrically connected with the fifth pad H05 directly or indirectly through the third diode D3, and the fourth through hole K04 can be electrically connected with the sixth pad H06 directly or indirectly through the fourth diode D4.

[0156] The second board surface B20 is provided with a third trace X03, the third trace X03 connects the third through hole K03 and the fourth through hole K04, and the direction of the third trace X03 is shown in Figure 3 ;

[0157] Through the above arrangement of the third through hole K03, the fourth through hole K04 and the third trace X03 on the circuit board, the other end of the seventh resistor R7, the third through hole K03, the third trace X03, the fourth through hole K04 and the pad welded with the second shielding conductor structure 222 are electrically connected in sequence.

[0158] In the embodiment, when the test switch TEST is pressed, the first touch area Tx-1 is shorted with the second touch area Tx-2, the electric signal on the second current-carrying line 120 is transmitted to the first touch area Tx-1 through the second pad H02, transmitted to the second touch area Tx-2 after passing through the test switch TEST, then transmitted to the third through-hole K03 through the seventh resistance R7, transmitted to the fourth through-hole K04 through the third wire X03, and finally transmitted to the fifth pad H05 or the sixth pad H06, which is equivalent to connecting the second current-carrying line 120 to the second shielding conductor structure 222 directly, that is, simulating the electric leakage signal of the second current-carrying line 120 to be transmitted to the second shielding conductor structure 222, so that whether the electric leakage detection function of the detection protection device is intact can be tested.

[0159] It should be further pointed out that, in combination with Figure 1 Since the fault response module 240 is connected to the connection point of the first self-checking unit 231 and the first shielding conductor structure 221, and the test switch TEST is connected to the connection point of the second self-checking unit 232 and the second shielding conductor structure 222 through the seventh resistance R7, when the test switch TEST is pressed, the simulated electric leakage signal generated by the test switch TEST first flows through the second shielding conductor structure 222 from the other end of the test switch TEST, then flows to the third end c of the first shielding conductor structure 221 through the sixth end f of the second shielding conductor structure 222, then flows through the first shielding conductor structure 221, and finally reaches the fault response module 240, that is, the simulated electric leakage signal completely flows through the electric leakage detection module 220, so that whether the first shielding conductor structure 221 and the second shielding conductor structure 222 are in an open circuit condition can be judged by whether the fault response module 240 receives the simulated electric leakage signal after the test switch TEST is pressed.

[0160] Referring to Figure 1 In the circuit board provided in some embodiments of the utility model, the fault response module 240 comprises a third resistance R3, a fourth resistance R4 and a first switch tube Q1;

[0161] Referring to Figure 6 In the fourth region B14, one end of the third resistance R3, one end of the fourth resistance R4 and the control pin of the first switch tube Q1 are adjacent and electrically connected;

[0162] One switch pin of the first switch tube Q1 is adjacent to and electrically connected with the trigger module 250 arranged in the third region B13;

[0163] The other switch pin of the first switch tube Q1 is connected with the second wire X02, so as to be connected to the first shielding conductor structure 221 through the second wire X02;

[0164] The third region B13 is provided with a fifth trace X05 electrically connected to the second pad H02, and the other end of the fourth resistor R4 is electrically connected to the second pad H02 through the fifth trace X05.

[0165] The other end of the third resistor R3 is electrically connected to the first pad H01.

[0166] In the embodiment, the first pad H01, the third resistor R3, the fourth resistor R4, the fifth trace X05 and the second pad H02 are electrically connected in sequence, which is equivalent to that the third resistor R3 and the fourth resistor R4 are connected in series between the first current-carrying line 110 and the second current-carrying line 120, and a divided voltage is provided to the control pin of the first switch tube Q1 through the connection point of the third resistor R3 and the fourth resistor R4, when the switch pin of the first switch tube Q1 connected to the first shielding conductor structure 221 receives a voltage greater than the divided voltage of the control pin, the first switch tube Q1 is turned on to output a trip trigger signal to the trigger module 250 through the switch pin connected to the trigger module 250.

[0167] Referring to Figure 1 In the circuit board provided in some embodiments of the utility model, the detection protection device further comprises a trip coil Lx; referring to Figure 6 The second region B12 is provided with a seventh pad Lx-1 and an eighth pad Lx-2 for welding two ends of the trip coil Lx;

[0168] The fourth region B14 is further provided with an eighth trace X08, and the circuit board is further provided with a fifth through hole K05, the fifth through hole K05 is also located in the fourth region B14, and the eighth trace X08 connects the other end of the third resistor R3 and the fifth through hole K05; the eighth trace X08 extends along the edge of the fourth region B14; the second board surface B20 is provided with a ninth trace X09; and the ninth trace X09 connects the fifth through hole K05 and the eighth pad Lx-2.

[0169] In the embodiment, the other end of the third resistor R3, the eighth trace X08, the fifth through hole K05, the ninth trace X09, the eighth pad Lx-2, the trip coil Lx, the seventh pad Lx-1 and the first pad H01 are electrically connected in sequence through the above arrangement of the fifth through hole K05, the eighth trace X08 and the ninth trace X09; the electrical connection between the other end of the third resistor R3 and the first current-carrying line 110 is realized, and the third resistor R3 and the fourth resistor R4 are connected in series between the first current-carrying line 110 and the second current-carrying line 120.

[0170] Referring to Figure 1 In the circuit board provided in some embodiments of the utility model, the detection protection device further comprises a trip coil Lx for generating an electromagnetic force to drive the switch module 210 to disconnect the power connection, and the trigger module 250 comprises a thyristor Q2 and a thyristor driving module 251.

[0171] and reference Figure 7 The second region B12 is provided with a first pad H01 for soldering the first current-carrying line 110, a second pad H02 for soldering the second current-carrying line 120, and a seventh pad Lx-1 and an eighth pad Lx-2 for soldering the two ends of the trip coil Lx.

[0172] The second area B12 is also equipped with a sixth trace X06, and the seventh pad Lx-1 is electrically connected to the first pad H01 through the sixth trace X06.

[0173] The eighth pad Lx-2 is adjacent to and electrically connected to the anode of the thyristor Q2;

[0174] In the third region B13, the cathode and control electrode of the thyristor Q2 are both adjacent to and electrically connected to the thyristor drive module 251.

[0175] More specifically, the thyristor drive module 251 includes an eighth resistor R8, a ninth resistor R9, and a first capacitor C1;

[0176] The third area B13 is provided with a seventh trace X07, through which the control electrode of the thyristor Q2, one end of the eighth resistor R8, one end of the ninth resistor R9 and one end of the first capacitor C1 are electrically connected.

[0177] The other end of the eighth resistor R8 is adjacent to and electrically connected to one of the switching pins of the first switching transistor Q1;

[0178] The third area B13 is also provided with a fifth trace X05 that is electrically connected to the second pad H02. The other end of the ninth resistor R9, the other end of the first capacitor C1, and the cathode of the thyristor Q2 are all electrically connected to the fifth trace X05, so that they can be electrically connected to the second pad H02 through the fifth trace X05.

[0179] In this embodiment, by Figure 7 The above layout is implemented on the first surface B10 of the circuit board. Figure 1 The connection relationship of each component in the trigger module 250 is shown. When the first switch Q1 is turned on, the current signal flowing through the first switch Q1 charges the first capacitor C1 after passing through the eighth resistor R8. The potential of the control electrode of the thyristor Q2 rises. When the negative half-cycle of the AC power supply arrives, that is, when the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110-trip coil Lx-thyristor Q2-fifth diode D5-second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input and output terminals of the power supply line.

[0180] ReferenceFigure 1 In the circuit board provided in some embodiments of the utility model, the first self-checking unit 231 comprises a first resistor R1 and a second resistor R2; the second self-checking unit 232 comprises a fifth resistor R5 and a sixth resistor R6;

[0181] With reference to Figure 8 One end of the first resistor R1 is adjacent to and electrically connected with the third pad H03, and the other end faces the second region B12;

[0182] One end of the second resistor R2 is adjacent to and electrically connected with the fourth pad H04, and the other end faces the second region B12;

[0183] One end of the fifth resistor R5 is adjacent to and electrically connected with the fifth pad H05, and the other end faces the second region B12;

[0184] One end of the sixth resistor R6 is adjacent to and electrically connected with the sixth pad H06, and the other end faces the second region B12.

[0185] With reference to Figure 8 The circuit board is further provided with a sixth through hole K06; the sixth through hole K06 is located in the first region B11 and is adjacent to and electrically connected with the other end of the first resistor R1 and the other end of the second resistor R2;

[0186] With reference to Figure 3 The second board surface B20 is provided with a tenth trace X10; the tenth trace X10 connects the sixth through hole K06 and the eighth pad Lx-2.

[0187] In the embodiment, the above arrangement of the sixth through hole K06 and the tenth trace X10 causes the other end of the first resistor R1 and the other end of the second resistor R2, the sixth through hole K06, the tenth trace X10, the eighth pad Lx-2, the trip coil Lx, the seventh pad Lx-1, and the first pad H01 to be electrically connected in sequence. That is, the first resistor R1 is connected between the first current-carrying line 110 and the first end a, the second resistor R2 is connected between the first current-carrying line 110 and the second end b, the first end a of the first shielding conductor structure 221 is separated from the first current-carrying line 110 by the first resistor R1, and the second end b of the first shielding conductor structure 221 is separated from the first current-carrying line 110 by the second resistor R2, so as to reduce the potential of the first shielding conductor structure 221 in the open circuit self-checking path, and cause the potential of the first shielding conductor structure 221 to not trigger the fault response module 240 to output a trip trigger signal under normal circumstances.

[0188] It should be noted that, in the absence of an open circuit of the first shielding conductor structure 221, the first end a of the first shielding conductor structure 221 and the second end b of the first shielding conductor structure 221 are equipotential points, at which time the first resistor R1 and the second resistor R2 are equivalent to being in a parallel state.

[0189] With reference to the above description Figure 8 , the circuit board is further provided with a seventh through hole K07 and an eighth through hole K08, the seventh through hole K07 is located in the first region B11 and is adjacent to and electrically connected with the other end of the fifth resistor R5 and the other end of the sixth resistor R6;

[0190] The eighth through hole K08 is located in the third region B13; the third region B13 is provided with a fifth trace X05, the fifth trace X05 connects the eighth through hole K08 and the second pad H02;

[0191] And with reference to Figure 3 , the second board surface B20 is provided with an eleventh trace X11; the eleventh trace X11 connects the seventh through hole K07 and the eighth through hole K08.

[0192] Through the above arrangement of the seventh through hole K07, the eighth through hole K08, the fifth trace X05 and the eleventh trace X11, the other end of the fifth resistor R5 and the other end of the sixth resistor R6, the seventh through hole K07, the eleventh trace X11, the eighth through hole K08, the fifth trace X05 and the second pad H02 are sequentially electrically connected. That is, the fifth resistor R5 is connected between the second current-carrying line 120 and the fourth end d, the sixth resistor R6 is connected between the second current-carrying line 120 and the fifth end e, the fourth end d of the second shielding conductor structure 222 is separated from the second current-carrying line 120 by the fifth resistor R5, and the fifth end e of the second shielding conductor structure 222 is separated from the second current-carrying line 120 by the sixth resistor R6, so as to reduce the potential of the second shielding conductor structure 222 in the open circuit self-checking path, so that under normal circumstances, the potential of the second shielding conductor structure 222 will not trigger the fault response module 240 to output the trip trigger signal.

[0193] It should be noted that in the case where the second shielding conductor structure 222 does not appear open circuit, the fourth end d of the second shielding conductor structure 222 and the fifth end e of the second shielding conductor structure 222 are equipotential points, at this time the fifth resistor R5 and the sixth resistor R6 are equivalent to be in parallel state.

[0194] It also needs to be explained that, since the third end c of the first shielding conductor structure 221 is connected with the sixth end f of the second shielding conductor structure 222, any point of the first shielding conductor structure 221 and any point of the second shielding conductor structure 222 are equipotential points without open circuit in the connection line between the first shielding conductor structure 221, the second shielding conductor structure 222 and the third end c and the sixth end f, and at this time, the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 is determined by the voltage division ratio of the first parallel resistance and the second parallel resistance, wherein the first parallel resistance is the resistance obtained by connecting the first resistance R1 and the second resistance R2 in parallel, and the second parallel resistance is the resistance obtained by connecting the fifth resistance R5 and the sixth resistance R6 in parallel.

[0195] With reference to Figure 1 In the circuit board provided by some embodiments of the present application, the detection protection device further comprises a first unidirectional conduction module 241, and the first unidirectional conduction module 241 comprises a first diode D1 and a second diode D2.

[0196] With reference to Figure 9 The first unidirectional conduction module 241 is arranged in the first region B11, and the first region B11 is provided with a twelfth trace X12 connecting the third pad H03 and the anode of the first diode D1; the anode of the second diode D2 is adjacent to and electrically connected with the fourth pad H04; the cathode of the first diode D1 and the cathode of the second diode D2 are both electrically connected with the first through hole K01.

[0197] In the present embodiment, the first diode D1 in the first unidirectional conduction module 241 can make the leakage signal on the first shielding conductor structure 221 and the open circuit signal generated when the open circuit self-checking path is open only unidirectionally pass through the third pad H03 and the twelfth trace X12 to the first through hole K01, and then unidirectionally pass to the fault response module 240; similarly, the second diode D2 in the first unidirectional conduction module 241 can make the leakage signal on the first shielding conductor structure 221 and the open circuit signal generated when the open circuit self-checking path is open only unidirectionally pass through the fourth pad H04 to the first through hole K01, and then unidirectionally pass to the fault response module 240.

[0198] With reference to Figure 1 In the circuit board provided by some embodiments of the present application, the detection protection device further comprises a second unidirectional conduction module 261, and the second unidirectional conduction module 261 comprises a third diode D3 and a fourth diode D4.

[0199] With reference to Figure 9The second unidirectional conduction module 261 is arranged in the first area B11, and the anode of the third diode D3 is adjacent to and electrically connected with the fifth pad H05.

[0200] In the embodiment, the third diode D3 in the second unidirectional conduction module 261 can make the analog leakage signal from the second current-carrying line 120 unidirectionally pass to the fourth end d of the second shield conductor structure 222 via the seventh resistor R7 when the test switch TEST is pressed.

[0201] It should be noted that each through hole described in each embodiment of the utility model, for example, the first through hole K01, the second through hole K02, the third through hole K03, the fourth through hole K04, the fifth through hole K05, the sixth through hole K06, the seventh through hole K07 and the eighth through hole K08, can all be via holes.

[0202] Referring to Figure 1 In the circuit board provided in some embodiments of the utility model, the trigger module 250 comprises a fifth diode D5 and a sixth diode D6.

[0203] Referring to Figure 6 and Figure 7 The anode of the fifth diode D5 and the anode of the sixth diode D6 are both connected with the fifth wire X05; the cathode of the fifth diode D5 is connected with the second pad H02; and the cathode of the sixth diode D6 is connected with the eighth wire X08.

[0204] Referring to Figure 1 In the circuit board provided in some embodiments of the utility model, the trigger module 250 further comprises a first piezoresistor ZR1. Figure 6 and Figure 7 The first piezoresistor ZR1 is adjacent to the sixth diode D6, and the two ends of the first piezoresistor ZR1 are respectively connected with the fifth wire X05 and the eighth wire X08.

[0205] It can be understood that the pressure sensitive resistor is a resistor device with nonlinear volt-ampere characteristic, mainly used for voltage clamping when the circuit bears overvoltage, absorbing excess current to protect sensitive devices, so that the first pressure sensitive resistor ZR1 is connected in parallel with the silicon controlled rectifier Q2 through the above setting, and the silicon controlled rectifier Q2 can be protected from being damaged.

[0206] With reference to Figure 1 In the circuit board provided in some embodiments of the utility model, the detection protection device further comprises a lightning protection module 280, and the lightning protection module 280 comprises a second pressure sensitive resistor ZR2; with reference to Figure 10 The second region B12 is provided with a ninth pad H09 and a tenth pad H10 for welding two pins of the second pressure sensitive resistor ZR2, the ninth pad H09 is electrically connected with the sixth wire X06, and the tenth pad H10 is adjacent to and electrically connected with the second pad H02.

[0207] It can be understood that the pressure sensitive resistor is a resistor device with nonlinear volt-ampere characteristic, mainly used for voltage clamping when the circuit bears overvoltage, absorbing excess current to protect sensitive devices, so that the second pressure sensitive resistor ZR2 is connected between the first current-carrying wire 110 and the second current-carrying wire 120 through the above setting, and the subsequent components in the detection protection device can be protected from being damaged by lightning voltage.

[0208] With reference to Figure 1 In the circuit board provided in some embodiments of the utility model, the detection protection device further comprises an indication module 270, and the indication module 270 comprises a tenth resistor R10, an eleventh resistor R11 and a light emitting diode LED1; with reference to Figure 11 The indication module 270 is arranged in the fourth region B14, one end of the tenth resistor R10 is connected to the eighth wire X08, the other end is connected to one end of the eleventh resistor R11, the fourth region B14 is further provided with a fourteenth wire X14 connecting the other end of the eleventh resistor R11 with one end of the light emitting diode LED1 and a fifteenth wire X15 connecting the other end of the light emitting diode LED1 with the fifth wire X05.

[0209] With reference to Figure 1 In the circuit board provided in some embodiments of the utility model, the overvoltage detection module 290 comprises a first voltage stabilizing tube DZ1; with further reference to Figure 12 The first voltage stabilizing tube DZ1 is adjacent to the fourth resistor R4, the positive electrode of the first voltage stabilizing tube DZ1 is connected to the fifth wire X05, and the negative electrode is connected to the connection point of the third resistor R3 and the fourth resistor R4.

[0210] In the embodiment, the third resistor R3 and the fourth resistor R4 divide the voltage between the first current-carrying line 110 and the second current-carrying line 120, and output the divided voltage to the negative electrode of the first voltage stabilizing tube DZ1. When the voltage between the first current-carrying line 110 and the second current-carrying line 120 is normal and not too large, the voltage across the first voltage stabilizing tube DZ1 is not enough to make the first voltage stabilizing tube DZ1 be broken down, and the first voltage stabilizing tube DZ1 is in the off state. When the voltage between the first current-carrying line 110 and the second current-carrying line 120 is abnormally large, the voltage across the fourth resistor R4 is greater than the threshold voltage of the first voltage stabilizing tube DZ1, the first voltage stabilizing tube DZ1 is reversely broken down and turned on, thereby pulling down the control electrode voltage of the first switch tube Q1, so that the first switch tube Q1 is turned on, and then a trip trigger signal is output to the trigger module 250 through one switch pin of the first switch tube Q1, so as to avoid product burnout caused by overvoltage.

[0211] In the circuit board provided by some embodiments of the utility model, the overvoltage detection module 290 further comprises a second voltage stabilizing tube DZ2 connected in series with the first voltage stabilizing tube DZ1. Referring to Figure 12 , the first voltage stabilizing tube DZ1 is adjacent to the second voltage stabilizing tube DZ2, the negative electrode of the first voltage stabilizing tube DZ1 is connected to the positive electrode of the second voltage stabilizing tube DZ2, and the negative electrode of the second voltage stabilizing tube DZ2 is connected to the connection point of the third resistor R3 and the fourth resistor R4.

[0212] In the embodiment, the overvoltage detection module 290 is provided with two voltage stabilizing tubes connected in series, so that the breakdown voltage of the overvoltage detection module 290 can be increased.

[0213] Next, the action of the detection protection device provided by the embodiments of the utility model under various leakage and open circuit conditions will be introduced with reference to the embodiment shown in Figure 1 . It should be noted that the first switch tube Q1 in the fault response module 240 can be a triode Q1, the emitter of the triode Q1 is connected to the cathode of the first diode D1 and the cathode of the second diode D2, the base of the triode Q1 is connected to the connection point of the third resistor R3 and the fourth resistor R4, and the collector of the triode Q1 is connected to one end of the eighth resistor R8 in the silicon controlled rectifier driving module 251.

[0214] The action under various leakage and open circuit conditions is as follows:

[0215] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0216] After the first shielding conductor structure 221 obtains the leakage signal, referring to Figure 13 , on the one hand, the leakage signal is transmitted from the first end a to the emitter of the triode Q1 through the first diode D1, and on the other hand, the leakage signal is transmitted from the second end b to the emitter of the triode Q1 through the second diode D2, and the triode Q1 is turned on;

[0217] When the triode Q1 is turned on, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply arrives, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0218] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0219] 2、When the leakage signal of the second current-carrying line 120 is transmitted to the second shielded conductor structure 222:

[0220] After the second shielded conductor structure 222 obtains the leakage signal, referring to FIG. 6, the leakage signal is transmitted from the sixth end f to the third end c of the first shielded conductor structure 221. On the one hand, the leakage signal is transmitted from the first end a to the emitter of the triode Q1 through the first diode D1. On the other hand, the leakage signal is transmitted from the second end b to the emitter of the triode Q1 through the second diode D2. The triode Q1 is turned on. Figure 14

[0221] When the triode Q1 is turned on, the leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply arrives, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0222] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0223] 3、When the first shielded conductor structure 221 is partially open between the first end a and the third end c:

[0224] The first resistor R1 is no longer connected in parallel with the second resistor R2. When the negative half cycle of the AC power supply arrives, that is, the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, referring to FIG. 7, an open circuit signal is generated at the connection point of the first resistor R1 and the first diode D1, and is transmitted to the emitter of the triode Q1 through the first diode D1. Figure 15

[0225] ​​When the triode Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply comes, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0226] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0227] 4. When the first shielding conductor structure 221 is partially open between the second end b and the third end c:

[0228] The second resistor R2 is no longer connected in parallel with the first resistor R1. When the negative half cycle of the AC power supply comes, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, as shown in FIG. 4, an open circuit signal is generated at the connection point of the second resistor R2 and the second diode D2, and is transmitted to the emitter of the triode Q1 via the second diode D2. Figure 16

[0229] When the triode Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply comes, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0230] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0231] 5. When the connection conductor between the third end c and the sixth end f is open:

[0232] The first parallel resistor obtained by connecting the first resistor R1 and the second resistor R2 in parallel is no longer connected in parallel with the second parallel resistor obtained by connecting the fifth resistor R5 and the sixth resistor R6 in parallel. When the negative half cycle of the AC power supply comes, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, as shown in FIG. 5, an open circuit signal is generated at the connection point of the first resistor R1 and the first diode D1, and is transmitted to the emitter of the triode Q1 via the first diode D1, and an open circuit signal is generated at the connection point of the second resistor R2 and the second diode D2, and is transmitted to the emitter of the triode Q1 via the second diode D2. Figure 17

[0233] ​​When the triode Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply arrives, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0234] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0235] 6. When the second shielded conductor structure 222 is in a partial open circuit between the fourth end d and the sixth end f:

[0236] The fifth resistor R5 is no longer in parallel with the sixth resistor R6, so that the voltage of the first end a, the second end b, the third end c of the first shielded conductor structure 221, and the fifth end e and the sixth end f of the second shielded conductor structure 222 rises, as shown in FIG. 6, which is equivalent to generating an open circuit signal at the connection point of the first resistor R1 and the first diode D1, and transmitting to the emitter of the triode Q1 via the first diode D1, and generating an open circuit signal at the connection point of the second resistor R2 and the second diode D2, and transmitting to the emitter of the triode Q1 via the second diode D2. Figure 18

[0237] When the triode Q1 is turned on, the open circuit signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises. When the negative half cycle of the AC power supply arrives, i.e., the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0238] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0239] 7. When the second shielded conductor structure 222 is in a partial open circuit between the fifth end e and the sixth end f:

[0240] The sixth resistor R6 is no longer in parallel with the fifth resistor R5, so that the voltage of the first end a, the second end b, the third end c of the first shielded conductor structure 221, and the fourth end d and the sixth end f of the second shielded conductor structure 222 rises, as shown in FIG. 7, which is equivalent to generating an open circuit signal at the connection point of the first resistor R1 and the first diode D1, and transmitting to the emitter of the triode Q1 via the first diode D1, and generating an open circuit signal at the connection point of the second resistor R2 and the second diode D2, and transmitting to the emitter of the triode Q1 via the second diode D2. Figure 19 ​As shown, an open circuit signal is generated at the connection point of the first resistor Rl and the first diode Dl, and is transmitted to the emitter of the transistor Ql via the first diode Dl, and an open circuit signal is generated at the connection point of the second resistor R2 and the second diode D2, and is transmitted to the emitter of the transistor Ql via the second diode D2;

[0241] After the transistor Ql is turned on, the open circuit signal charges the first capacitor Cl and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 is raised. When the negative half cycle of the AC power supply arrives, i.e., the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0242] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0243] 8. When the test switch TEST is pressed:

[0244] During the positive half cycle of the AC power supply, i.e., the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, referring to Figure 20 As shown, the analog leakage signal from the second current-carrying line 120 first passes through the test switch TEST and then passes through the seventh resistor R7. On the one hand, the analog leakage signal is transmitted to the fourth end d of the second shielded conductor structure 222 via the third diode D3, and then flows through the sixth end f of the second shielded conductor structure 222, the third end c of the first shielded conductor structure 221, the first end a, and the first diode Dl to the emitter of the transistor Ql. On the other hand, the analog leakage signal is transmitted to the fifth end e of the second shielded conductor structure 222 via the fourth diode D4, and then flows through the sixth end f of the second shielded conductor structure 222, the third end c of the first shielded conductor structure 221, the second end b, and the second diode D2 to the emitter of the transistor Ql.

[0245] After the transistor Ql is turned on, a conduction path is formed from the transistor Ql - the eighth resistor R8 - the ninth resistor R9 - the sixth diode D6 - the trip coil Lx - the second current-carrying line 120. The analog leakage signal charges the first capacitor Cl and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 is raised.

[0246] When the negative half cycle of the AC power supply arrives, i.e., the level of the first current-carrying line 110 is greater than the level of the second current-carrying line 120, the thyristor Q2 is turned on, forming a strong current path of the first current-carrying line 110 - the trip coil Lx - the thyristor Q2 - the fifth diode D5 - the second current-carrying line 120.

[0247] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0248] 9. When the voltage between the first current-carrying line 110 and the second current-carrying line 120 is too high:

[0249] During the negative half cycle of the alternating power supply, that is, the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, referring to Figure 21 The voltage across the fourth resistor R4 in the current path of the first current-carrying line 110-trip coil Lx-third resistor R3-fourth resistor R4-fifth diode D5-second current-carrying line 120 is higher than the threshold voltage of the zener DZ1 and the zener DZ2, and the zener DZ1 and the zener DZ2 are reversely broken down to turn on, thereby pulling down the base voltage of the triode Q1 to make the triode Q1 turn on.

[0250] After the triode Q1 turns on, a conduction path is formed from the first current-carrying line 110-trip coil Lx-third resistor R1 / fourth resistor R2-first diode D1 / second diode D2-triode Q1-eighth resistor R8-ninth resistor R9-sixth diode D6-trip coil Lx-second current-carrying line 120, and the analog leakage signal charges the first capacitor C1 and the second capacitor C2, and the voltage of the control electrode of the thyristor Q2 rises.

[0251] When the negative half cycle of the alternating power supply, that is, the level of the first current-carrying line 110 is higher than that of the second current-carrying line 120, the thyristor Q2 turns on to form a strong current path of the first current-carrying line 110-trip coil Lx-thyristor Q2-fifth diode D5-second current-carrying line 120.

[0252] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power supply line.

[0253] The detection protection device provided by the embodiment of the utility model can detect the leakage signal on the current-carrying line through the leakage detection module 220, can construct an open circuit self-checking path through the self-checking path module 230 in cooperation with the leakage detection module 220 and the current-carrying line, can realize the leakage detection of the power supply line and the automatic open circuit detection of the shielding structure of the power supply line, can realize the manual open circuit detection of the shielding structure of the power supply line through the test switch TEST of the test module 260, the shielding network with multiple detection segments formed by the first shielding conductor structure 221 and the second shielding conductor structure 222 can be combined, thereby multiple different detection paths can be constructed, the feasibility and flexibility of the leakage detection and the open circuit detection of the shielding structure of the power supply line are greatly enriched, and the power supply safety of the power supply line can be improved.

[0254] In addition, with reference to Figure 22 The second aspect of the present application provides an electrical connection device, comprising the circuit board, the power line 100, the detection protection device arranged on the circuit board and connected with the power line 100 in each embodiment of the first aspect.

[0255] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge range possessed by those skilled in the art without departing from the purpose of the present application.

Claims

1. A circuit board of an electrical connection device, characterized by, The electric connection device comprises a power line, a detection protection device arranged on the circuit board and electrically connected with the power line; The power line comprises a first current-carrying line, a second current-carrying line, a first shielding conductor structure covering the first current-carrying line, and a second shielding conductor structure covering the second current-carrying line, the first shielding conductor structure being connected with the second shielding conductor structure; The detection protection device comprises a fault response module, a trigger module, and an overvoltage detection module, the overvoltage detection module being configured to generate an overvoltage signal and output the overvoltage signal to the fault response module when detecting that the voltage between the first current-carrying line and the second current-carrying line is too large; The fault response module is electrically connected to the first shielding conductor structure, the trigger module, and the overvoltage detection module, respectively; The circuit board comprises a first board surface and a second board surface, the first board surface comprising a first region, a second region, a third region, and a fourth region arranged in sequence; The first region is further provided with a pad for welding the first shielding conductor structure and the second shielding conductor structure; The second region is provided with a pad for welding the first current-carrying line and the second current-carrying line; The trigger module is arranged in the third region; The fault response module and the overvoltage detection module are arranged in the fourth region, the overvoltage detection module being adjacent to the fault response module and electrically connected to the fault response module; The circuit board is further provided with a plurality of through holes, the second board surface being provided with a trace connecting at least two through holes, the first shielding conductor structure being electrically connected to the fault response module through the through holes and the trace.

2. The circuit board of claim 1, wherein The detection protection device further comprises a self-checking path module, the self-checking path module comprising a first self-checking unit and a second self-checking unit, the first self-checking unit being electrically connected between the first current-carrying line and the first shielding conductor structure, and the second self-checking unit being electrically connected between the second current-carrying line and the second shielding conductor structure; the fault response module is further electrically connected to the self-checking path module; The first self-checking unit and the second self-checking unit are arranged in the first region.

3. The circuit board of claim 2, wherein: The circuit board is provided with a first through hole and a second through hole, the second board surface being provided with a first trace, and the first board surface being provided with a second trace; The pad for welding the first shielding conductor structure, the first through hole, the first trace, the second through hole, the second trace, and the fault response module are electrically connected in sequence; wherein: The first through hole is located in the first region and adjacent to the pad for welding the first shielding conductor structure; The second through hole is located at a position of the second region close to the third region; The first trace connects the first through hole and the second through hole.

4. The circuit board of claim 3, wherein The second trace passes through the third region and extends to the fault response module in the fourth region, the second trace being located at an edge of the third region.

5. The circuit board of claim 2, wherein The detection protection device further comprises a test module, the test module comprising a test switch and a seventh resistor; The second region is provided with a first pad for welding the first current-carrying wire and a second pad for welding the second current-carrying wire; The seventh resistor is arranged in the third region, and a middle part of the third region is further provided with a first contact pressure area and a second contact pressure area for respectively contacting and pressing two ends of the test switch, the first contact pressure area is adjacent to and electrically connected with the second pad, and the second contact pressure area is adjacent to and electrically connected with one end of the seventh resistor.

6. The circuit board according to claim 5, characterized in that: The circuit board is provided with a third via hole and a fourth via hole, and the second board surface is provided with a third trace; The other end of the seventh resistor, the third via hole, the third trace, the fourth via hole and the pad for welding the second shielding conductor structure are sequentially electrically connected; Among them: The third via hole is located in the third region and adjacent to the other end of the seventh resistor; The fourth via hole is located in the first region and adjacent to the pad for welding the second shielding conductor structure; The third trace connects the third via hole and the fourth via hole.

7. The circuit board of claim 3, wherein The fault response module comprises a third resistor, a fourth resistor and a first switch tube; The second region is provided with a first pad for welding the first current-carrying wire and a second pad for welding the second current-carrying wire; In the fourth region, one end of the third resistor, one end of the fourth resistor and the control pin of the first switch tube are adjacent and electrically connected; One switch pin of the first switch tube is adjacent to and electrically connected with the trigger module; The other switch pin of the first switch tube is connected with the second trace; The third region is provided with a fifth trace electrically connected to the second pad, and the other end of the fourth resistor is electrically connected to the second pad through the fifth trace; The other end of the third resistor is electrically connected to the first pad.

8. The circuit board of claim 7, wherein, The detection protection device further comprises a trip coil, and the second region is provided with a seventh pad and an eighth pad for welding two ends of the trip coil; The fourth region is further provided with an eighth trace, the circuit board is further provided with a fifth via hole, and the second board surface is provided with a ninth trace; The other end of the third resistor, the eighth trace, the fifth via hole, the ninth trace, the eighth pad, the trip coil, the seventh pad and the first pad are sequentially electrically connected; Among them: The eighth trace and the fifth via hole are located in the fourth region, and the eighth trace extends along the edge of the fourth region; The eighth trace connects the other end of the third resistor and the fifth via hole; The ninth trace connects the fifth via hole and the eighth pad.

9. The circuit board of claim 7, wherein, The overvoltage detection module comprises a first voltage stabilizing tube adjacent to the fourth resistor, a positive electrode of the first voltage stabilizing tube is connected to the fifth trace, and a negative electrode of the first voltage stabilizing tube is connected to a connection point of the third resistor and the fourth resistor.

10. The circuit board of claim 9, wherein, The overvoltage detection module further comprises a second voltage stabilizing tube adjacent to the first voltage stabilizing tube, a negative electrode of the first voltage stabilizing tube is connected to a positive electrode of the second voltage stabilizing tube, and a negative electrode of the second voltage stabilizing tube is connected to the connection point of the third resistor and the fourth resistor.

11. The circuit board of claim 2, wherein, The detection protection device further comprises a tripping coil, and the trigger module comprises a thyristor and a thyristor driving module; The second region is provided with a first pad for welding the first current-carrying wire, a second pad for welding the second current-carrying wire, and a seventh pad and an eighth pad for welding two ends of the tripping coil; The second region is further provided with a sixth wire, and the seventh pad and the first pad are electrically connected through the sixth wire; The eighth pad is adjacent to and electrically connected with the anode of the thyristor; In the third region, the cathode and the control electrode of the thyristor are both adjacent to and electrically connected with the thyristor driving module.

12. The circuit board of claim 11, wherein, The thyristor driving module comprises an eighth resistor, a ninth resistor and a first capacitor; The third region is provided with a seventh wire, and the control electrode of the thyristor, one end of the eighth resistor, one end of the ninth resistor and one end of the first capacitor are electrically connected through the seventh wire; The other end of the eighth resistor is adjacent to and electrically connected with the fault response module; The third region is further provided with a fifth wire electrically connected with the second pad, and the other end of the ninth resistor, the other end of the first capacitor and the cathode of the thyristor are electrically connected with the fifth wire.

13. The circuit board of claim 3, wherein, The first shielding conductor structure comprises a first end close to the input end of the power line and a second end close to the output end of the power line; the first region is provided with a third pad for welding the first end and a fourth pad for welding the second end; The second shielding conductor structure comprises a fourth end close to the input end of the power line and a fifth end close to the output end of the power line; the first region is provided with a fifth pad for welding the fourth end and a sixth pad for welding the fifth end.

14. The circuit board of claim 13, wherein, The first self-checking unit comprises a first resistor and a second resistor; the second self-checking unit comprises a fifth resistor and a sixth resistor; One end of the first resistor is adjacent to and electrically connected with the third pad, and the other end faces the second region; One end of the second resistor is adjacent to and electrically connected with the fourth pad, and the other end faces the second region; One end of the fifth resistor is adjacent to and electrically connected with the fifth pad, and the other end faces the second region; One end of the sixth resistor is adjacent to and electrically connected with the sixth pad, and the other end faces the second region.

15. The circuit board of claim 14, wherein, The detection protection device further comprises a tripping coil, and the second region is provided with a first pad for welding the first current-carrying wire, a second pad for welding the second current-carrying wire, and a seventh pad and an eighth pad for welding two ends of the tripping coil; The circuit board is further provided with a sixth through hole; the second board surface is provided with a tenth wire; The other end of the first resistor and the other end of the second resistor, the sixth through hole, the tenth wire, the eighth pad, the tripping coil, the seventh pad and the first pad are sequentially electrically connected; Wherein: The sixth through hole is located in the first region and is adjacent to and electrically connected with the other end of the first resistor and the other end of the second resistor; The tenth wire connects the sixth through hole and the eighth pad.

16. The circuit board of claim 15, wherein, the circuit board is further provided with a seventh via hole and an eighth via hole, the third region is provided with a fifth trace, and the second board surface is provided with an eleventh trace; one end of the fifth resistor and one end of the sixth resistor, the seventh via hole, the eleventh trace, the eighth via hole, the fifth trace, and the second pad are sequentially electrically connected; wherein: the seventh via hole is located in the first region and is adjacent to and electrically connected to one end of the fifth resistor and one end of the sixth resistor; the eighth via hole is located in the third region; the fifth trace connects the eighth via hole and the second pad; the eleventh trace connects the seventh via hole and the eighth via hole.

17. The circuit board of claim 13, wherein, The detection protection device further comprises a first unidirectional conduction module arranged in the first region, and the first unidirectional conduction module comprises a first diode and a second diode; the first region is provided with a twelfth trace connecting the third pad and an anode of the first diode; an anode of the second diode is adjacent to and electrically connected to the fourth pad; a cathode of the first diode and a cathode of the second diode are both electrically connected to the first via hole.

18. The circuit board of claim 6, wherein, The second shielding conductor structure comprises a fourth end close to an input end of the power line and a fifth end close to an output end of the power line; the first region is provided with a fifth pad for welding the fourth end and a sixth pad for welding the fifth end; The detection protection device further comprises a second unidirectional conduction module arranged in the first region, and the second unidirectional conduction module comprises a third diode and a fourth diode; an anode of the third diode is adjacent to and electrically connected to the fifth pad; the first region is provided with a thirteenth trace connecting the sixth pad and an anode of the fourth diode; a cathode of the third diode and a cathode of the fourth diode are both electrically connected to the fourth via hole.

19. The circuit board of claim 8, wherein, The trigger module comprises a fifth diode and a sixth diode; an anode of the fifth diode and an anode of the sixth diode are both connected to the fifth trace; a cathode of the fifth diode is connected to the second pad; a cathode of the sixth diode is connected to the eighth trace.

20. The circuit board of claim 19, wherein, The trigger module further comprises a first voltage-dependent resistor adjacent to the sixth diode, and two ends of the first voltage-dependent resistor are respectively connected to the fifth trace and the eighth trace.

21. The circuit board of claim 11, wherein, The detection protection device further comprises a lightning protection module, and the lightning protection module comprises a second voltage-dependent resistor; the second region is provided with a ninth pad and a tenth pad for welding two pins of the second voltage-dependent resistor; the ninth pad is electrically connected to the sixth trace; and the tenth pad is adjacent to and electrically connected to the second pad.

22. The circuit board of claim 8, wherein, The detection protection device further comprises an indication module arranged in the fourth region, the indication module comprising a tenth resistor, an eleventh resistor and a light-emitting diode, one end of the tenth resistor being connected to the eighth wire, the other end of the tenth resistor being connected to one end of the eleventh resistor, the fourth region further comprising a fourteenth wire connecting the other end of the eleventh resistor and one end of the light-emitting diode, and a fifteenth wire connecting the other end of the light-emitting diode and the fifth wire.

23. An electrical connection device, characterized by The detection protection device comprises the circuit board, the power line, and the detection protection device arranged on the circuit board and connected to the power line.

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