Detection protection device for power line, electric connection device and electric appliance

Abstract

The utility model discloses a kind of detection protection device of power line, electric connection equipment and electric equipment, power line includes first current-carrying wire, second current-carrying wire, shielding conductor being set to the outer side of first current-carrying wire and second current-carrying wire;Detection protection device includes power module, self-checking path module, response processing module and power failure detection module, self-checking path module is electrically connected with shielding conductor, power module respectively;Response processing module is used to in the case where open circuit appears in shielding conductor, shielding conductor detects the situation of leakage signal, disconnects the power connection between the input end and output end of power line;Power failure detection module is used to in the case where direct current detection voltage output by power module fails, triggers response processing module to disconnect the power connection between the input end and output end of power line, and the reliability of detection protection device can be improved.

Description

Technical Field

[0001] This utility model relates to the field of electrical technology, and in particular to a power cord detection and protection device, an electrical connection device, and an electrical appliance. Background Technology

[0002] A leakage circuit breaker (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power supply line via a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have not only needed to detect leakage current in the power supply line via the leakage current detection lead, but also have higher safety detection requirements, such as detecting whether the leakage current detection lead is open-circuited. Utility Model Content

[0003] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide a power cord detection and protection device, an electrical connection device and an electrical device, which can improve the reliability of the detection and protection device.

[0004] In a first aspect, embodiments of the present invention provide a power cord detection and protection device, wherein the power cord includes a first current-carrying wire, a second current-carrying wire, and a shielding conductor disposed outside the first current-carrying wire and the second current-carrying wire; the detection and protection device includes a power module, a self-test path module, a response processing module, and a power failure detection module, wherein: The power module is electrically connected to the first current-carrying line and the second current-carrying line respectively, and is used to output DC detection voltage; The self-test path module is electrically connected to the shielding conductor and the output terminal of the power module, respectively. The response processing module is electrically connected to the first current-carrying line, the second current-carrying line, and the self-test path module, respectively, and is used to disconnect the power connection between the input and output ends of the power line when the shielding conductor is open-circuited or when the shielding conductor detects a leakage signal. The power failure detection module is electrically connected to the response processing module and the output terminal of the power module, respectively, and is used to trigger the response processing module to disconnect the power connection between the input and output terminals of the power line when the DC detection voltage output by the power module fails.

[0005] The power cord detection and protection device provided according to the embodiments of this utility model has at least the following beneficial effects: Under the action of the DC detection voltage provided by the power module, the self-test path module, together with the shielding conductor, forms an open-circuit self-test path. In the event of leakage or open circuit, the power connection between the input and output terminals of the power cord is disconnected by the response processing module, ensuring the power supply safety of the power cord; a power failure detection module is also provided to detect the validity of the DC detection voltage output by the power module. In the event of failure of the DC detection voltage output by the power module, the response processing module is triggered to disconnect the power connection between the input and output terminals of the power cord, thereby improving the reliability of the detection and protection device.

[0006] According to some embodiments of the present invention, the power failure detection module includes a first switching transistor, a voltage divider injection module electrically connected between the first current-carrying line and the second current-carrying line, and a voltage divider trigger module electrically connected between the output terminal of the power module and the second current-carrying line. The voltage divider injection module is also electrically connected to the response processing module, and is used to provide a second trip trigger signal to the response processing module when the DC detection voltage output by the power module fails. The two switching pins of the first switching transistor are electrically connected to the voltage divider injection module and the second current-carrying line, respectively. The voltage divider trigger module is electrically connected to the control pin of the first switching transistor to control the first switching transistor to conduct when the DC detection voltage output by the power module is valid, so that the voltage divider injection module cannot provide the second trip trigger signal to the response processing module.

[0007] According to some embodiments of the present invention, the detection and protection device includes a voltage divider injection module comprising a first resistor, a first diode, and a second resistor; the first current-carrying line, the first resistor, the first diode, the second resistor, and the second current-carrying line are electrically connected in sequence; the connection point between the first resistor and the first diode is connected to the first switching transistor; and the connection point between the first diode and the second resistor is connected to the response processing module.

[0008] According to some embodiments of the present invention, the detection and protection device includes a voltage divider trigger module comprising a third resistor and a fourth resistor, wherein the output terminal of the power supply module, the third resistor, the fourth resistor, and the second current-carrying line are electrically connected in sequence; the connection point of the third resistor and the fourth resistor is connected to the control pin of the first switching transistor.

[0009] According to some embodiments of the present invention, the detection and protection device further includes a first capacitor and a second capacitor. The first capacitor is connected in parallel with the second resistor, and the two ends of the second capacitor are respectively connected to the two switching pins of the first switching transistor.

[0010] According to some embodiments of the present invention, the detection and protection device further includes a second diode connected between the first resistor and the first diode, and the connection point of the second diode and the first diode is connected to the first switching transistor.

[0011] According to some embodiments of the present invention, the detection and protection device includes a first shielding conductor covering the first current-carrying line and a second shielding conductor covering the second current-carrying line; the first shielding conductor includes a first end near the input end of the power line and a second end near the output end of the power line; the second shielding conductor includes a third end near the input end of the power line and a fourth end near the output end of the power line; the self-test path module includes a first self-test unit, a second self-test unit, and a third self-test unit. The first self-test unit is electrically connected between the output terminal of the power module and the second current-carrying line, and is provided with a first detection terminal; The second self-test unit is electrically connected to the first self-test unit, the first terminal, and the third terminal, and is provided with a second detection terminal; The third self-test unit is electrically connected to the second terminal, the fourth terminal, and the second current-carrying line; The response processing module is electrically connected to the first detection terminal, the second detection terminal, the first current-carrying line, and the second current-carrying line, respectively.

[0012] According to some embodiments of the present invention, the detection and protection device includes a first self-test unit comprising a third diode, a fifth resistor, and a sixth resistor. The output terminal of the power module, the third diode, the fifth resistor, the sixth resistor, and the second current-carrying line are sequentially electrically connected. The connection point between the fifth resistor and the sixth resistor serves as the first detection terminal.

[0013] According to some embodiments of the present invention, the detection and protection device includes a second self-test unit comprising a seventh resistor and an eighth resistor. The connection point of the third diode and the fifth resistor is connected to one end of the seventh resistor. The other end of the seventh resistor is connected to the first end, the third end, and one end of the eighth resistor. The other end of the eighth resistor serves as the second detection end.

[0014] The detection and protection device provided according to some embodiments of the present invention further includes a test module, wherein the test module includes a test switch connected in parallel with the seventh resistor.

[0015] According to some embodiments of the present invention, the detection and protection device includes a third self-test unit comprising a ninth resistor, a tenth resistor, a fourth diode, and a fifth diode. The second terminal, the ninth resistor, the fourth diode, and the second current-carrying line are connected in sequence and electrically. The fourth terminal, the tenth resistor, the fifth diode, and the second current-carrying line are electrically connected in sequence.

[0016] According to some embodiments of the present invention, the detection and protection device includes a fault response processing module and a triggering module. The fault response processing module is electrically connected to the first detection terminal, the second detection terminal and the trigger module respectively, and is used to acquire the open circuit signal generated when the first shielding conductor and / or the second shielding conductor is open, and to acquire the leakage current signal detected by the first shielding conductor and / or the second shielding conductor, and output the first trip trigger signal in response to the open circuit signal or the leakage current signal. The trigger module is electrically connected to the fault response processing module, the first current-carrying line and the second current-carrying line respectively. The trigger module is configured to disconnect the power connection between the input end and the output end of the power line through the switch module in response to receiving the first trip trigger signal.

[0017] According to some embodiments of the present invention, the fault response processing module of the detection and protection device includes a second transistor and a third transistor; The base of the second transistor and the emitter of the third transistor are both connected to the first detection terminal; The emitter of the second transistor and the base of the third transistor are both connected to the second detection terminal; The collectors of the second transistor and the third transistor are connected together and connected to the trigger module to output the first trip trigger signal to the trigger module.

[0018] According to some embodiments of the present invention, the detection and protection device includes a trigger module comprising a thyristor, a sixth diode, and a trip coil for generating electromagnetic force to drive the switching module to disconnect the power connection. The first current-carrying line, the trip coil, the thyristor, the sixth diode, and the second current-carrying line are electrically connected in sequence. The control pin of the thyristor is electrically connected to the power failure detection module, the collector of the second transistor, and the collector of the third transistor.

[0019] The detection and protection device provided according to some embodiments of the present invention further includes an indicator module, which includes an eleventh resistor and a light-emitting diode, wherein the output terminal of the power supply module, the eleventh resistor, the light-emitting diode, and the second current-carrying line are electrically connected in sequence.

[0020] Secondly, this utility model provides an electrical connection device, including the detection and protection device, housing, and power cord as described in the first aspect embodiment above. The power cord is connected to the housing, and the power module, the response processing module, and the power failure detection module are disposed in the housing.

[0021] Thirdly, this utility model provides an electrical device, including a load device and an electrical connection device as described in the second aspect of the embodiment above, wherein the output end of the power line is connected to the load device.

[0022] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0023] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a circuit diagram of the detection and protection device provided in this embodiment of the utility model; Figure 2 This is the equivalent circuit of the self-test path formed in the embodiment of this utility model; Figure 3 This is a circuit schematic diagram of the power module provided in this embodiment of the utility model; Figure 4 This is a schematic diagram of the current signal flow direction of the detection and protection device provided in this embodiment under normal conditions; Figure 5 This is a schematic diagram of the current signal flow direction under the condition of leakage in the first current-carrying line provided in this embodiment of the utility model; Figure 6 This is a schematic diagram of the current signal flow direction when leakage occurs in the second current-carrying line, provided in an embodiment of this utility model; Figure 7This is a schematic diagram of the current signal flow direction when the first shielding conductor is open-circuited, provided in an embodiment of this utility model. Figure 8 This is a schematic diagram of the current signal flow when the second shielding conductor is open-circuited, provided in an embodiment of this utility model. Figure 9 This is a schematic diagram of the current signal flow when the test switch is pressed, provided in an embodiment of this utility model. Figure 10 This is a schematic diagram of the structure of the electrical connection device provided in an embodiment of the present utility model. Detailed Implementation

[0025] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0026] In the description of the embodiments of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. "At least one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0027] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this utility model should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this utility model in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0028] It should be noted that the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] A leakage circuit breaker (LCDI) is a power connection device for electrical appliances. It detects leakage current in the power supply line via a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have not only needed to detect leakage current in the power supply line via the leakage current detection lead, but also have higher safety detection requirements, such as detecting whether the leakage current detection lead is open-circuited.

[0030] Currently, in LCDI schemes that use switching power supplies to power the detection circuit, if the components in the main circuit of the switching power supply fail and there is no output power supply voltage, leakage current detection and shield wire breakage detection cannot be performed. The LCDI will lose its core protection function for the power supply line, affecting its reliability.

[0031] Based on this, the present invention provides a power cord detection and protection device, an electrical connection device, and an electrical device, which can improve the reliability of the detection and protection device.

[0032] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0033] Figure 1 This is a circuit diagram of the detection and protection device provided in an embodiment of this utility model. (Refer to...) Figure 1 The first aspect of this utility model provides a power cord detection and protection device. The power cord includes a first current-carrying line 110, a second current-carrying line 120, and a shielding conductor disposed outside the first current-carrying line 110 and the second current-carrying line 120. Exemplarily, the shielding conductor includes a first shielding conductor 130 covering the first current-carrying line 110 and a second shielding conductor 140 covering the second current-carrying line 120.

[0034] It is understandable that when a power supply line supplies power to electrical equipment using two-phase AC power, it can be one of the following two scenarios: the first current-carrying wire 110 is the live wire L, and the second current-carrying wire 120 is the neutral wire N; or the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L. When a power supply line supplies power to electrical equipment using three-phase AC power, it can be one of the following three scenarios: the first current-carrying wire 110 is the live wire L1, and the second current-carrying wire 120 is the neutral wire N; the first current-carrying wire 110 is the neutral wire N, and the second current-carrying wire 120 is the live wire L1; or the first current-carrying wire 110 is the live wire L1, and the second current-carrying wire 120 is the live wire L2. Below, we will use... Figure 1 The following example illustrates the situation where the first current-carrying line 110 is the live wire L and the second current-carrying line 120 is the neutral wire N. The other cases can be understood in the same way.

[0035] Continue to refer to Figure 1The first shielding conductor 130 is used to collect the leakage current signal of the first current-carrying line 110, and the second shielding conductor 140 is used to collect the leakage current signal of the second current-carrying line 120. The first shielding conductor 130 includes a first end a near the input end of the power line and a second end b near the output end of the power line. The second shielding conductor 140 includes a fourth end d near the input end and a fifth end e near the output end.

[0036] The detection and protection device includes a power supply module 200, a self-test path module 300, a response processing module, and a power failure detection module 500, wherein: The power module 200 is electrically connected to the first current-carrying line 110 and the second current-carrying line 120 respectively, and is used to output a DC detection voltage of +18V; for example, refer to Figure 3 As shown, Figure 3 The specific circuit diagram of the power module 200 provided in one embodiment of this utility model is shown.

[0037] The self-test path module 300 is electrically connected to the first shielding conductor 130, the second shielding conductor 140, and the output terminal of the power module 200, respectively. The response processing module is electrically connected to the first current-carrying line 110, the second current-carrying line 120, and the self-test path module 300, respectively, and is used to disconnect the power connection between the input and output terminals of the power line in the event that the first shielding conductor 130 is open, the second shielding conductor 140 is open, the first shielding conductor 130 detects a leakage signal and / or the second shielding conductor 140 detects a leakage signal. The power failure detection module 500 is electrically connected to the response processing module and the output terminal of the power module 200, respectively. It is used to trigger the response processing module to disconnect the power connection between the input and output terminals of the power line when the DC detection voltage +18V output by the power module 200 fails.

[0038] Understandably, the detection and protection device also includes a switch module 100 for controlling the power connection between the input and output terminals of the power cord. (Refer to...) Figure 1 As shown, the switch module 100 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 100 are closed, the power connection between the input end and the output end of the power line is made on; when the switch terminals of the switch module 100 are open, the power connection between the input end and the output end of the power line is disconnected.

[0039] According to the power cord detection and protection device provided in this embodiment of the present invention, the first shielding conductor 130 covers the first current-carrying line 110, thereby enabling the collection of leakage current signals from the first current-carrying line 110. The second shielding conductor 140 covers the second current-carrying line 120, thereby enabling the collection of leakage current signals from the second current-carrying line 120. Based on this, under the action of the DC detection voltage +18V provided by the power module 200, the self-test path module 300, together with the first shielding conductor 130 and the second shielding conductor 140, forms an open-circuit self-test path. In the event of leakage or open circuit, the power connection between the input and output terminals of the power cord is disconnected by the response processing module, ensuring the power supply safety of the power cord. A power failure detection module 500 is also provided to detect the validity of the DC detection voltage +18V output by the power module 200. In the event of failure of the DC detection voltage +18V output by the power module 200, the response processing module is triggered to disconnect the power connection between the input and output terminals of the power cord, thereby improving the reliability of the detection and protection device.

[0040] Reference Figure 3 In some embodiments of the detection and protection device provided by this utility model, the power module 200 includes a fuse FUSE, a second varistor ZR2, a twelfth resistor R12, a seventh diode D7, an eighth diode D8, a first electrolytic capacitor E1, a thirteenth resistor R13, a fifth capacitor C5, a ninth diode D9, a fourteenth resistor R14, a transformer TR1, a voltage regulator chip U1, a tenth diode D10, an eleventh diode D11, a fifteenth resistor R15, a sixth capacitor C6, a seventh capacitor C7, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a second electrolytic capacitor E2, and an eighth capacitor C8; wherein, the transformer TR1 includes a primary winding, an output winding, and a feedback winding.

[0041] Specifically, the first current-carrying line 110 is connected to one end of the fuse FUSE, and the other end of the fuse FUSE is connected to one end of the second varistor ZR2 and one end of the twelfth resistor R12; the other end of the twelfth resistor R12 is connected to the anode of the seventh diode D7, the cathode of the seventh diode D7 is connected to the anode of the eighth diode D8, the cathode of the eighth diode D8 is connected to one end of the first electrolytic capacitor E1, one end of the thirteenth resistor R13, one end of the fifth capacitor C5, and one end of the primary winding of the transformer TR1; the other end of the thirteenth resistor R13 is connected together with the other end of the fifth capacitor C5 and connected to the cathode of the ninth diode D9, the anode of the ninth diode D9 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 and the other end of the primary winding of the transformer TR1 are both connected to the drain terminal of the voltage regulating chip U1; One end of the output winding of transformer TR1 is connected to the anode of the tenth diode D10; the cathode of the tenth diode D10 is connected to one end of the second electrolytic capacitor E2 and one end of the eighth capacitor C8. One end of the feedback winding of transformer TR1 is connected to one end of the fifteenth resistor R15, one end of the sixteenth resistor R16, and one end of the seventeenth resistor R17; the other end of the fifteenth resistor R15 is connected to the anode of the eleventh diode D11, and the cathode of the eleventh diode D11 is connected to the VCC terminal of voltage regulator chip U1, one end of the sixth capacitor C6, and one end of the seventh capacitor C7; the other ends of the sixth capacitor C6 and the seventh capacitor C7 are connected to the GND terminal of voltage regulator chip U1 and grounded; the other ends of the sixteenth resistor R16 and the seventeenth resistor R17 are connected to the FB terminal of voltage regulator chip U1 and to one end of the eighteenth resistor R18; one end of the nineteenth resistor R19 is connected to the ISEN terminal of voltage regulator chip U1. The second current-carrying line 120 connects to the other end of the second varistor ZR2, the other end of the first electrolytic capacitor E1, the other end of the nineteenth resistor R19, the other end of the eighteenth resistor R18, the other end of the feedback winding of transformer TR1, the other end of the output winding of transformer TR1, the other end of the second electrolytic capacitor E2, and the other end of the eighth capacitor C8.

[0042] In the power module 200 provided in the embodiment, the input terminal, output terminal and feedback terminal are completely separated by the transformer TR1, and energy is transferred by coupling. There is no electrical connection between the output terminal and the feedback terminal.

[0043] Reference Figure 1 In some embodiments of the present invention, the power failure detection module 500 includes a first switching transistor Q1, a voltage divider injection module 510 electrically connected between the first current-carrying line 110 and the second current-carrying line 120, and a voltage divider trigger module 520 electrically connected between the output terminal of the power module 200 and the second current-carrying line 120. The voltage divider injection module 510 is also electrically connected to the response processing module to provide a second trip trigger signal to the response processing module in the event that the DC detection voltage +18V output by the power supply module 200 fails. The two switching pins of the first switching transistor Q1 are electrically connected to the voltage divider injection module 510 and the second current-carrying line 120, respectively. The voltage divider trigger module 520 is electrically connected to the control pin of the first switching transistor Q1 so that when the DC detection voltage +18V output by the power supply module 200 is valid, the first switching transistor Q1 is controlled to be turned on so that the voltage divider injection module 510 cannot provide the second trip trigger signal to the response processing module.

[0044] In this embodiment, when the +18V DC detection voltage output by the power module 200 is valid, the voltage divider trigger module 520 divides the voltage difference between the output terminal of the power module 200 and the second current-carrying line 120, and provides a first-level voltage signal to the control pin of the first switch Q1, causing the first switch Q1 to conduct. The voltage divider injection module 510 is connected to the second current-carrying line 120 through the first switch Q1, thus preventing it from providing the second trip trigger signal to the response processing module. When the +18V DC detection voltage output by the power module 200 fails, the voltage divider trigger module 520 provides a 0V low-level voltage signal to the control pin of the first switch Q1, causing the first switch Q1 to turn off. The voltage divider injection module 510 is directly electrically connected between the first current-carrying line 110 and the second current-carrying line 120, and provides the second trip trigger signal to the response processing module to trigger the response processing module to disconnect the power connection between the input and output terminals of the power line.

[0045] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a voltage divider injection module 510 comprising a first resistor R1, a first diode D1, and a second resistor R2; a first current-carrying line 110, a first resistor R1, a first diode D1, a second resistor R2, and a second current-carrying line 120 are electrically connected in sequence; the connection point between the first resistor R1 and the first diode D1 is connected to the first switching transistor Q1; and the connection point between the first diode D1 and the second resistor R2 is connected to the response processing module.

[0046] In this embodiment, when the first switch Q1 is turned off, ignoring the voltage drop of the first diode D1, the voltage difference between the first current-carrying line 110 and the second current-carrying line 120 is divided by the first resistor R1 and the second resistor R2 to obtain the second trip trigger signal, which is then output to the response processing module from the connection point of the first diode D1 and the second resistor R2. When the first switch Q1 is turned on, the connection point of the first resistor R1 and the first diode D1 is connected to the second current-carrying line 120 through the first switch Q1, forming a conduction loop of the first current-carrying line 110, the first resistor R1, the first switch Q1, and the second current-carrying line 120. At this time, the connection point of the first diode D1 and the second resistor R2 cannot output the second trip trigger signal to the response processing module.

[0047] It should be noted that in some embodiments, the response processing module includes a sixth diode D6, and the second resistor R2 can be directly electrically connected to the second current-carrying line 120, or indirectly connected to the second current-carrying line 120 through the sixth diode D6 in the response processing module. Similarly, the switching pin of the first switching transistor Q1 can be directly electrically connected to the second current-carrying line 120, or indirectly connected to the second current-carrying line 120 through the sixth diode D6 in the trigger module 420.

[0048] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a voltage divider trigger module 520, which includes a third resistor R3 and a fourth resistor R4. The output terminal of the power supply module 200, the third resistor R3, the fourth resistor R4, and the second current-carrying line 120 are electrically connected in sequence. The connection point of the third resistor R3 and the fourth resistor R4 is connected to the control pin of the first switching transistor Q1.

[0049] In this embodiment, the voltage divider trigger module 520 divides the voltage difference between the output terminal of the power module 200 and the second current-carrying line 120 by using a third resistor R3 and a fourth resistor R4 connected in series. This allows it to provide a first-level voltage signal to the control pin of the first switch Q1 when the DC detection voltage +18V output by the power module 200 is valid, thus turning on the first switch Q1. Conversely, it provides a 0V low-level voltage signal to the control pin of the first switch Q1 when the DC detection voltage +18V output by the power module 200 is invalid, thus turning off the first switch Q1. Similarly, it should be noted that the fourth resistor R4 can be directly connected to the second current-carrying line 120, or indirectly connected to the second current-carrying line 120 through the sixth diode D6 in the trigger module 420.

[0050] Reference Figure 1 In some embodiments of the present invention, the detection and protection device provided includes a voltage divider injection module 510, which further includes a first capacitor C1 and a second capacitor C2. The first capacitor C1 is connected in parallel with the second resistor R2, and the two ends of the second capacitor C2 are respectively connected to the two switch pins of the first switch transistor Q1.

[0051] In this embodiment, by setting a first capacitor C1 connected in parallel with the second resistor R2 and a second capacitor C2 connected in parallel with the two switch pins of the first switch Q1 in the voltage divider injection module 510, the power-on soft start function is realized. This allows the first capacitor C1 and the second capacitor C2 to be charged when the detection and protection device is powered on, before the power module 200 has established the DC detection voltage +18V output. The charging voltage will not exceed the tripping voltage of the response processing module, and no false tripping phenomenon will occur upon power-on. It should be noted that it may take some time for the power module 200 to establish a DC detection voltage of +18V. If the power module 200 has not yet established a DC detection voltage of +18V at the moment the detection and protection device is powered on, the voltage divider trigger module 520 provides a low-level voltage signal of 0V to the control pin of the first switching transistor Q1, causing the first switching transistor Q1 to turn off. At this time, if there is no first capacitor C1 and second capacitor C2, a conducting loop will be directly formed between the first current-carrying line 110, the first resistor R1, the first diode D1, the second resistor R2, and the second current-carrying line 120, causing the response processing module to disconnect the power connection between the input and output terminals of the power line, resulting in a false tripping phenomenon upon power-on.

[0052] Reference Figure 1 In some embodiments of the present invention, the detection and protection device provided includes a voltage divider injection module 510, which further includes a second diode D2 connected between the first resistor R1 and the first diode D1, and the connection point of the second diode D2 and the first diode D1 is connected to the first switching transistor Q1.

[0053] In this embodiment, by providing a first diode D1 and a second diode D2 in the voltage divider injection module 510, the conduction loop from the first current-carrying line 110 through the first resistor R1 and the first switch Q1 to the second current-carrying line 120, and the conduction loop from the first current-carrying line 110 through the first resistor R1, the first diode D1, and the second resistor R2 to the second current-carrying line 120, are only implemented during the half-cycle when the voltage amplitude of the first current-carrying line 110 is greater than that of the second current-carrying line 120; they are not conducted during the other half-cycle. In some embodiments, the voltage divider injection module 510 may further include a twenty-sixth resistor R26 disposed between the first resistor R1 and the second diode D2.

[0054] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a first shielding conductor 130 with a first end a near the input end of the power line and a second end b near the output end of the power line; a second shielding conductor 140 with a third end d near the input end of the power line and a fourth end e near the output end of the power line; and a self-test path module 300 with a first self-test unit 310, a second self-test unit 320 and a third self-test unit 330. The first self-test unit 310 is electrically connected between the output terminal of the power module 200 and the second current-carrying line 120, and is provided with a first detection terminal X; The second self-test unit 320 is electrically connected to the first self-test unit 310, the first terminal a and the third terminal d, and is provided with a second detection terminal Y; The third self-test unit 330 is electrically connected to the second terminal b, the fourth terminal e, and the second current-carrying line 120. The response processing module is electrically connected to the first detection terminal X, the second detection terminal Y, the first current-carrying line 110, and the second current-carrying line 120, respectively.

[0055] In this embodiment, the first self-test unit 310, the second self-test unit 320, and the third self-test unit 330 in the self-test path module 300, together with the first shielding conductor 130 and the second shielding conductor 140, form an open-circuit self-test path, and are provided with a first detection terminal X and a second detection terminal Y. When there is no leakage or open circuit, the potentials of the first detection terminal X and the second detection terminal Y are constant, and the response processing module will not be triggered. When leakage or open circuit occurs, the potentials of the first detection terminal X and the second detection terminal Y change, which will trigger the response processing module to disconnect the power connection between the input and output terminals of the power cord, thereby ensuring the power supply safety of the power cord. This power cord detection and protection device can effectively and reliably realize leakage detection of the power cord and open circuit detection of the shielding conductor of the power cord.

[0056] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a first self-test unit 310 comprising a third diode D3, a fifth resistor R5, and a sixth resistor R6. The output terminal of the power module 200, the third diode D3, the fifth resistor R5, the sixth resistor R6, and the second current-carrying line 120 are electrically connected in sequence. The connection point between the fifth resistor R5 and the sixth resistor R6 serves as the first detection terminal X.

[0057] In this embodiment, the voltage between the output terminal of the power module 200 and the second current-carrying line 120 is divided by the third diode D3, the fifth resistor R5 and the sixth resistor R6 in the first self-test unit 310 to determine the potential of the first detection terminal X.

[0058] It is understood that in some embodiments, the first self-test unit 310 may also include a third capacitor C3, which is connected in parallel with the fifth resistor R5.

[0059] Reference Figure 1In some embodiments of the detection and protection device provided by this utility model, the second self-test unit 320 includes a seventh resistor R7 and an eighth resistor R8. The connection point of the third diode D3 and the fifth resistor R5 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the first terminal a, the third terminal d, and one end of the eighth resistor R8. The other end of the eighth resistor R8 serves as the second detection terminal Y. It can be understood that in some embodiments, the second self-test unit 320 may also include a fourth capacitor C4, which is connected in parallel with the seventh resistor R7.

[0060] Reference Figure 1 In the detection and protection device provided in some embodiments of this utility model, the third self-test unit 330 includes a ninth resistor R9, a tenth resistor R10, a fourth diode D4, and a fifth diode D5; The second terminal b, the ninth resistor R9, the fourth diode D4, and the second current-carrying line 120 are connected in sequence. The fourth terminal e, the tenth resistor R10, the fifth diode D5, and the second current-carrying line 120 are connected electrically in sequence.

[0061] Specifically, the equivalent circuit of the self-test path formed by the first self-test unit 310, the second self-test unit 320, and the third self-test unit 330 in the self-test path module 300 in conjunction with the first shielding conductor 130 and the second shielding conductor 140 is as follows: Figure 2 As shown.

[0062] In this embodiment, the seventh resistor R7 and the eighth resistor R8 in the second self-test unit 320, the ninth resistor R9 and the tenth resistor R10 in the third self-test unit 330, the fourth diode D4 and the fifth diode D5, together with the first shielding conductor 130 and the second shielding conductor 140, form a special detection path. This path enables the detection of the first shielding conductor 130 and the second shielding conductor 140, and determines the potential of the second detection terminal Y. This allows the potential of either the first detection terminal X or the second detection terminal Y to be affected when a leakage signal is detected in the first shielding conductor 130, the second shielding conductor 140, or both the first and second shielding conductors are open-circuited. This triggers the response processing module to disconnect the power connection between the input and output terminals of the power cord, ensuring the power supply safety of the power cord.

[0063] Reference Figure 1 In some embodiments of the present invention, the detection and protection device also includes a test module 600, which includes a test switch TEST connected in parallel with the seventh resistor R7.

[0064] In this embodiment, when the test switch TEST in the test module 600 is pressed, it is equivalent to short-circuiting the two ends of the seventh resistor R7, thereby changing the potential of the second detection terminal Y, thereby triggering the response processing module to act, and thus testing whether the leakage current detection function of the detection protection device is intact.

[0065] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a fault response processing module 410 and a triggering module 420. The fault response processing module 410 is electrically connected to the first detection terminal X, the second detection terminal Y and the trigger module 420 respectively. It is used to acquire the open circuit signal generated when the first shielding conductor 130 and / or the second shielding conductor 140 is open, and to acquire the leakage current signal detected by the first shielding conductor 130 and / or the second shielding conductor 140. In response to the open circuit signal or the leakage current signal, it outputs the first trip trigger signal. The trigger module 420 is electrically connected to the fault response processing module 410, the first current-carrying line 110, and the second current-carrying line 120 respectively. The trigger module 420 is configured to disconnect the power connection between the input and output terminals of the power line through the switch module 100 in response to receiving the first trip trigger signal.

[0066] Continue to refer to Figure 1 In some embodiments of the present invention, the fault response processing module 410 includes a second transistor Q2 and a third transistor Q3. The base of the second transistor Q2 and the emitter of the third transistor Q3 are both connected to the first detection terminal X; The emitter of the second transistor Q2 and the base of the third transistor Q3 are both connected to the second detection terminal Y; The collectors of the second transistor Q2 and the third transistor Q3 are connected together and connected to the trigger module 420 to output a first trip trigger signal to the trigger module 420.

[0067] In this embodiment, when the voltage received at the emitter of the second transistor Q2 is greater than the voltage received at the base of the second transistor Q2, the emitter junction of the second transistor Q2 is forward biased and thus conducts, thereby outputting a first trip trigger signal to the trigger module 420 through the collector of the second transistor Q2; similarly, when the voltage received at the emitter of the third transistor Q3 is greater than the voltage received at the base of the third transistor Q3, the emitter junction of the third transistor Q3 is forward biased and thus conducts, thereby outputting a first trip trigger signal to the trigger module 420 through the collector of the third transistor Q3.

[0068] Reference Figure 1In some embodiments of the present invention, the detection and protection device includes a trigger module 420 comprising a thyristor Q4, a sixth diode D6, and a trip coil Lx for generating electromagnetic force to drive the switch module 100 to disconnect the power connection. The first current-carrying line 110, the trip coil Lx, the thyristor Q4, the sixth diode D6, and the second current-carrying line 120 are electrically connected in sequence. The control pin of the thyristor Q4 is electrically connected to the power failure detection module 500, the collector of the second transistor Q2, and the collector of the third transistor Q3.

[0069] In this embodiment, when the first trip trigger signal is output from the collector of the second transistor Q2 or the collector of the third transistor Q3 to the control pin of the thyristor Q4, and the positive half-cycle of the AC power supply is reached, 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 Q4 is turned on, forming a strong current path of the first current-carrying line 110-trip coil Lx-thyristor Q4-sixth diode D6-second current-carrying line 120; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power supply line.

[0070] Reference Figure 1 In some embodiments of the detection and protection device provided by this utility model, the trigger module 420 further includes a first varistor ZR1 connected in parallel with the silicon controlled rectifier Q4. It is understood that a varistor is a resistor with nonlinear current-voltage characteristics, mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. Therefore, setting the first varistor ZR1 in parallel with the silicon controlled rectifier Q4 can protect the silicon controlled rectifier Q4 from damage.

[0071] Reference Figure 1 In some embodiments of the present invention, the detection and protection device also includes an indicator module 700. The indicator module 700 includes an eleventh resistor R11 and a light-emitting diode LED1. The output terminal of the power supply module 200, the eleventh resistor R11, the light-emitting diode LED1, and the second current-carrying line 120 are electrically connected in sequence.

[0072] In this embodiment, when the DC detection voltage +18V output by the power module 200 is valid, a conduction circuit is formed between the output terminal of the power module 200, the eleventh resistor R11, the light-emitting diode LED1, and the second current-carrying line 120, and the light-emitting diode LED1 is lit. Correspondingly, when the DC detection voltage +18V output by the power module 200 fails, the light-emitting diode LED1 is turned off, thereby prompting the user.

[0073] Below, with Figure 1 The illustrated embodiments describe the detection and protection device provided by this utility model under various conditions: 1. When the detection and protection device is in normal condition, the current signal flow direction is as follows: Figure 4 As shown: Firstly, a conduction loop is formed from the output terminal of the power module 200 through the third diode D3, the seventh resistor R7, the first shielding conductor 130, the ninth resistor R9 and the fourth diode D4, to the second current-carrying line 120. Secondly, a conduction loop is formed from the output terminal of the power module 200 through the third diode D3, the seventh resistor R7, the second shielding conductor 140, the tenth resistor R10 and the fifth diode D5, to the second current-carrying line 120. Thirdly, a conduction loop is formed from the output terminal of the power module 200 through the third diode D3, the fifth resistor R5, the sixth resistor R6 and the sixth diode D6, to the second current-carrying line 120. Fourthly, a conduction loop is formed from the output terminal of the power module 200 through the eleventh resistor R11, the light-emitting diode LED1 and the sixth diode D6, to the second current-carrying line 120. Fifthly, a conduction loop is formed from the output terminal of the power module 200 through the third resistor R3, the fourth resistor R4 and the sixth diode D6, to the second current-carrying line 120; and the first switching transistor Q1 is turned on. Sixthly, a conduction loop is formed from the first current-carrying line 110 through the first resistor R1, the second diode D2, the first switch Q1 and the sixth diode D6, to the second current-carrying line 120.

[0074] 2. When the first current-carrying line 110 leaks current to the first shielding conductor 130, a leakage current signal is sent to the second transistor Q2 through the second detection terminal Y, causing the second transistor Q2 to conduct and output a trip trigger signal to the trigger module 420.

[0075] Specifically, after the first shielding conductor 130 receives the leakage signal, it refers to... Figure 5 As shown, the leakage current provided by the first shielding conductor 130 flows from the first end a of the first shielding conductor 130 through the seventh resistor R7, the fifth resistor R5, and the sixth resistor R6 in sequence. On the other hand, it flows from the first end a of the first shielding conductor 130 through the eighth resistor R8 and then from the second detection terminal Y to the emitter of the second transistor Q2. This causes the voltage received at the emitter of the second transistor Q2 to be greater than the voltage at its base, thus turning on the second transistor Q2. Additionally, there are other leakage currents... Figure 5 Other current flows indicated by the arrows; After the second transistor Q2 is turned on, current flows through the second transistor Q2 and from the collector of the second transistor Q2 to the second resistor R2, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q4 increases. When the positive 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 Q4 is turned on, forming a strong current path of first current-carrying line 110 - trip coil Lx - thyristor Q4 - sixth diode D6 - second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power line.

[0076] 3. When the second current-carrying line 120 leaks current to the second shielding conductor 140, a leakage current signal is sent to the third transistor Q3 through the first detection terminal X, causing the third transistor Q3 to conduct and output a trip trigger signal to the trigger module 420.

[0077] Specifically, refer to Figure 6 As shown, the current supplied by the output terminal of the power module 200 flows through the third diode D3 and the seventh resistor R7 to the second shielding conductor 140, and then directly to the second current-carrying line 120, no longer flowing through the tenth resistor R10 and the fifth diode D5. This causes the potential of the second detection terminal Y to decrease, and the potential of the first detection terminal X to be greater than the potential of the second detection terminal Y, forming a conducting loop from the output terminal of the power module 200 through the third diode D3, the fifth resistor R5, the first detection terminal X, the third transistor Q3, the second detection terminal Y, and the eighth resistor R8, to the second shielding conductor 140. The voltage received at the emitter of the third transistor Q3 is greater than the voltage at its base, causing the third transistor Q3 to conduct. Additionally, there are other... Figure 6 Other current flows indicated by the arrows; After the third transistor Q3 is turned on, current flows through the third transistor Q3 and from the collector of the third transistor Q3 to the second resistor R2, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q4 increases. When the positive 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 Q4 is turned on, forming a strong current path of first current-carrying line 110 - trip coil Lx - thyristor Q4 - sixth diode D6 - second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power line.

[0078] 4. When the first shielding conductor 130 is open-circuited, an open-circuit signal is sent to the second transistor Q2 through the second detection terminal Y, causing the second transistor Q2 to conduct and output a trip trigger signal to the trigger module 420.

[0079] Specifically, after the first shielding conductor 130 becomes open-circuited, refer to Figure 7 As shown, the current supplied by the output terminal of the power module 200, after passing through the third diode D3 and the seventh resistor R7, cannot flow through the first shielding conductor 130, causing the potential of the second detection terminal Y to rise. After passing through the eighth resistor R8, the current flows from the second detection terminal Y to the emitter of the second transistor Q2. The voltage received at the emitter of the second transistor Q2 is greater than the voltage at its base, causing the second transistor Q2 to conduct. Additionally, there are other issues such as... Figure 7 Other current flows indicated by the arrows; After the second transistor Q2 is turned on, the current flows from the second detection terminal Y through the second transistor Q2, and from the collector of the second transistor Q2 to the second resistor R2, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q4 increases. When the positive 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 Q4 is turned on, forming a strong current path of first current-carrying line 110 - trip coil Lx - thyristor Q4 - sixth diode D6 - second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power line.

[0080] 5. When the second shielding conductor 140 is open-circuited, an open-circuit signal is sent to the second transistor Q2 through the second detection terminal Y, causing the second transistor Q2 to conduct and output a trip trigger signal to the trigger module 420.

[0081] Specifically, after the second shielding conductor 140 becomes open-circuited, refer to Figure 8 As shown, the current supplied by the output terminal of the power module 200, after passing through the third diode D3 and the seventh resistor R7, cannot flow through the second shielding conductor 140, causing the potential of the second detection terminal Y to rise. The current then flows through the eighth resistor R8 from the second detection terminal Y to the emitter of the second transistor Q2. The voltage received at the emitter of the second transistor Q2 is greater than the voltage at its base, causing the second transistor Q2 to conduct. Additionally, there are other issues such as... Figure 8 Other current flows indicated by the arrows; After the second transistor Q2 is turned on, the current flows from the second detection terminal Y through the second transistor Q2, and from the collector of the second transistor Q2 to the second resistor R2, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q4 increases. When the positive 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 Q4 is turned on, forming a strong current path of first current-carrying line 110 - trip coil Lx - thyristor Q4 - sixth diode D6 - second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power line.

[0082] 6. When the test switch TEST is pressed: a current signal is sent to the second transistor Q2 through the second detection terminal Y, so that the second transistor Q2 is turned on, and a trip trigger signal is output to the trigger module 420.

[0083] Specifically, after the test switch TEST is pressed, refer to Figure 9 As shown, the seven resistor R7 is short-circuited, causing the potential of the second detection terminal Y to rise. After passing through the eighth resistor R8, the current flows from the second detection terminal Y to the emitter of the second transistor Q2. The emitter of the second transistor Q2 receives a voltage greater than the base voltage, causing the second transistor Q2 to conduct. Additionally, there are other... Figure 9 Other current flows indicated by the arrows; After the second transistor Q2 is turned on, the current flows from the second detection terminal Y through the second transistor Q2, and from the collector of the second transistor Q2 to the second resistor R2, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q4 increases. When the positive 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 Q4 is turned on, forming a strong current path of first current-carrying line 110 - trip coil Lx - thyristor Q4 - sixth diode D6 - second current-carrying line 120. The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 100 to disconnect the power connection between the input and output terminals of the power line.

[0084] Reference Figure 10 The second aspect of this utility model provides an electrical connection device 800, including the detection and protection device as described in the first aspect embodiment, a housing 810, and a power cord. The power cord is connected to the housing 810, and a power module 200, a response processing module, and a power failure detection module 500 are disposed in the housing 810.

[0085] In addition, a third aspect of the present invention provides an electrical device, including a load device and an electrical connection device as described in the second aspect of the present invention, wherein the output end of a power cord is connected to the load device.

[0086] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A power cord detection and protection device, characterized in that, The power line includes a first current-carrying line, a second current-carrying line, and a shielding conductor disposed outside the first current-carrying line and the second current-carrying line; The detection protection device includes: The power module is electrically connected to the first current-carrying line and the second current-carrying line respectively, and is used to output DC detection voltage; The self-test path module is electrically connected to the shielding conductor and the output terminal of the power module, respectively. The response processing module is electrically connected to the first current-carrying line, the second current-carrying line, and the self-test path module, respectively, and is used to disconnect the power connection between the input and output terminals of the power line when the shielding conductor is open-circuited or when the shielding conductor detects a leakage signal. The power failure detection module is electrically connected to the response processing module and the output terminal of the power module, respectively. It is used to trigger the response processing module to disconnect the power connection between the input and output terminals of the power line when the DC detection voltage output by the power module fails.

2. The detection and protection device according to claim 1, characterized in that, The power failure detection module includes a first switching transistor, a voltage divider injection module electrically connected between the first current-carrying line and the second current-carrying line, and a voltage divider trigger module electrically connected between the output terminal of the power module and the second current-carrying line. The voltage divider injection module is also electrically connected to the response processing module, and is used to provide a second trip trigger signal to the response processing module when the DC detection voltage output by the power module fails. The two switching pins of the first switching transistor are electrically connected to the voltage divider injection module and the second current-carrying line, respectively. The voltage divider trigger module is electrically connected to the control pin of the first switching transistor to control the first switching transistor to conduct when the DC detection voltage output by the power module is valid, so that the voltage divider injection module cannot provide the second trip trigger signal to the response processing module.

3. The detection and protection device according to claim 2, characterized in that, The voltage divider injection module includes a first resistor, a first diode, and a second resistor; the first current-carrying line, the first resistor, the first diode, the second resistor, and the second current-carrying line are electrically connected in sequence; the connection point between the first resistor and the first diode is connected to the first switching transistor; and the connection point between the first diode and the second resistor is connected to the response processing module.

4. The detection and protection device according to claim 2, characterized in that, The voltage divider trigger module includes a third resistor and a fourth resistor. The output terminal of the power supply module, the third resistor, the fourth resistor, and the second current-carrying line are electrically connected in sequence. The connection point of the third resistor and the fourth resistor is connected to the control pin of the first switching transistor.

5. The detection and protection device according to claim 3, characterized in that, The voltage divider injection module also includes a first capacitor and a second capacitor. The first capacitor is connected in parallel with the second resistor, and the two ends of the second capacitor are respectively connected to the two switching pins of the first switching transistor.

6. The detection and protection device according to claim 3, characterized in that, The voltage divider injection module further includes a second diode connected between the first resistor and the first diode, and the connection point of the second diode and the first diode is connected to the first switching transistor.

7. The detection and protection device according to claim 1, characterized in that, The shielding conductor includes a first shielding conductor covering the first current-carrying line and a second shielding conductor covering the second current-carrying line; the first shielding conductor includes a first end near the input end of the power line and a second end near the output end of the power line; the second shielding conductor includes a third end near the input end of the power line and a fourth end near the output end of the power line; the self-test path module includes a first self-test unit, a second self-test unit, and a third self-test unit; The first self-test unit is electrically connected between the output terminal of the power module and the second current-carrying line, and is provided with a first detection terminal; The second self-test unit is electrically connected to the first self-test unit, the first terminal, and the third terminal, and is provided with a second detection terminal; The third self-test unit is electrically connected to the second terminal, the fourth terminal, and the second current-carrying line; The response processing module is electrically connected to the first detection terminal, the second detection terminal, the first current-carrying line, and the second current-carrying line, respectively.

8. The detection and protection device according to claim 7, characterized in that, The first self-test unit includes a third diode, a fifth resistor, and a sixth resistor. The output terminal of the power module, the third diode, the fifth resistor, the sixth resistor, and the second current-carrying line are electrically connected in sequence. The connection point of the fifth resistor and the sixth resistor serves as the first detection terminal.

9. The detection and protection device according to claim 8, characterized in that, The second self-test unit includes a seventh resistor and an eighth resistor. The connection point of the third diode and the fifth resistor is connected to one end of the seventh resistor. The other end of the seventh resistor is connected to the first end, the third end, and one end of the eighth resistor. The other end of the eighth resistor serves as the second detection end.

10. The detection and protection device according to claim 9, characterized in that, It also includes a test module, which includes a test switch connected in parallel with the seventh resistor.

11. The detection and protection device according to any one of claims 7 to 9, characterized in that, The third self-test unit includes a ninth resistor, a tenth resistor, a fourth diode, and a fifth diode; The second terminal, the ninth resistor, the fourth diode, and the second current-carrying line are connected in sequence and electrically. The fourth terminal, the tenth resistor, the fifth diode, and the second current-carrying line are electrically connected in sequence.

12. The detection and protection device according to claim 7, characterized in that, The response processing module includes a fault response processing module and a triggering module; The fault response processing module is electrically connected to the first detection terminal, the second detection terminal and the trigger module respectively, and is used to acquire the open circuit signal generated when the first shielding conductor and / or the second shielding conductor is open, and to acquire the leakage current signal detected by the first shielding conductor and / or the second shielding conductor, and output the first trip trigger signal in response to the open circuit signal or the leakage current signal. The trigger module is electrically connected to the fault response processing module, the first current-carrying line and the second current-carrying line respectively. The trigger module is configured to disconnect the power connection between the input and output terminals of the power line through the switch module in response to receiving the first trip trigger signal.

13. The detection and protection device according to claim 12, characterized in that, The fault response processing module includes a second transistor and a third transistor; The base of the second transistor and the emitter of the third transistor are both connected to the first detection terminal; The emitter of the second transistor and the base of the third transistor are both connected to the second detection terminal; The collectors of the second transistor and the third transistor are connected together and connected to the trigger module to output the first trip trigger signal to the trigger module.

14. The detection and protection device according to claim 13, characterized in that, The triggering module includes a thyristor, a sixth diode, and a trip coil for generating electromagnetic force to drive the switching module to disconnect the power connection. The first current-carrying line, the trip coil, the thyristor, the sixth diode, and the second current-carrying line are electrically connected in sequence. The control pin of the thyristor is electrically connected to the power failure detection module, the collector of the second transistor, and the collector of the third transistor.

15. The detection and protection device according to claim 1, characterized in that, It also includes an indicator module, which includes an eleventh resistor and a light-emitting diode. The output terminal of the power module, the eleventh resistor, the light-emitting diode, and the second current-carrying line are electrically connected in sequence.

16. An electrical connection device, characterized in that, The device includes the detection and protection device, housing, and power cord as described in any one of claims 1 to 15, wherein the power cord is connected to the housing, and the power module, the response processing module, and the power failure detection module are disposed in the housing.

17. An electrical appliance, characterized in that, It includes a load device and the electrical connection device as described in claim 16, wherein the output end of the power line is connected to the load device.

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