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

Abstract

The application discloses a power line detection protection device, an electric connection device and an electric equipment. The power line comprises a first current-carrying wire, a second current-carrying wire, a third wire, a first shielding conductor and a second shielding conductor. The detection protection device comprises a self-checking path module and a response processing module. The first current-carrying wire is electrically connected to one end of the first shielding conductor and one end of the second shielding conductor through the self-checking path module. The other end of the first shielding conductor and the other end of the second shielding conductor are electrically connected to the third wire through the self-checking path module. The response processing module is used for disconnecting the power connection between the input end and the output end of the power line in the case of open circuit or in the case of detecting a leakage signal. The leakage detection of the power line and the open circuit detection of the shielding conductor of the power line can be effectively and reliably realized.

Description

Technical Field

[0001] This invention 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.

[0003] How to effectively and reliably detect leakage current in power cords and detect open circuits in the shielding conductors of power cords has become a problem that current power connection devices need to solve. Summary of the Invention

[0004] The purpose of this invention 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 effectively and reliably realize leakage detection of power cords and open circuit detection of the shielding conductor of power cords.

[0005] 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, a third conductor, a first shielding conductor covering the first current-carrying wire, and a second shielding conductor covering the second current-carrying wire; the detection and protection device includes a self-test path module and a response processing module, wherein:

[0006] The first current-carrying line is electrically connected to one end of the first shielded conductor and one end of the second shielded conductor through the self-test path module, and the other end of the first shielded conductor and the other end of the second shielded conductor are electrically connected to the third wire through the self-test path module;

[0007] The response processing module is electrically connected to the self-test path module and is used to disconnect the power connection between the input and output terminals of the power line when the first shielding conductor is open, the second shielding conductor is open, the first shielding conductor detects a leakage signal and / or the second shielding conductor detects a leakage signal.

[0008] The power cord detection and protection device provided according to the embodiments of the present invention has at least the following beneficial effects: the first shielding conductor covers the first current-carrying wire, thereby enabling the collection of leakage current signals of the first current-carrying wire; the second shielding conductor covers the second current-carrying wire, thereby enabling the collection of leakage current signals of the second current-carrying wire; based on this, the self-test path module, together with the first shielding conductor, the second shielding conductor, and the third wire, constitutes a 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; the 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.

[0009] According to some embodiments of the present invention, the detection and protection device includes a self-testing path module comprising a first self-testing unit, a second self-testing unit, and a third self-testing unit; the first self-testing unit is electrically connected between the first current-carrying line and the third conductor, and is provided with a first detection terminal; the second self-testing unit is electrically connected to the first current-carrying line, one end of the first shielding conductor, and one end of the second shielding conductor, and is provided with a second detection terminal; the third self-testing unit is electrically connected to the other end of the first shielding conductor, the other end of the second shielding conductor, and the third conductor.

[0010] 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.

[0011] In this embodiment, the first self-test unit, the second self-test unit, and the third self-test unit in the self-test path module, together with the first shielding conductor, the second shielding conductor, and the third wire, constitute an open-circuit self-test path. A first detection terminal and a second detection terminal are provided. When there is no leakage or open circuit, the potentials of the first and second detection terminals remain constant, and the response processing module will not be triggered. When leakage or open circuit occurs, the potentials of the first and second detection terminals change, triggering 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. This power cord detection and protection device can effectively and reliably detect leakage in the power cord and detect open circuits in the shielding conductor of the power cord.

[0012] The detection and protection device provided according to some embodiments of the present invention further includes a test module, the test module including a test switch and a first resistor, one end of the test switch being connected to one end of the first resistor;

[0013] The other end of the test switch is connected to one of the first current-carrying line and the second current-carrying line;

[0014] The other end of the first resistor is connected to one of the first detection terminal, the second detection terminal, the first shielding conductor, and the second shielding conductor.

[0015] According to some embodiments of the present invention, the detection and protection device includes a first self-test unit comprising a second resistor, a third resistor, and a first diode connected in sequence; the second resistor is electrically connected to the first current-carrying line, and the cathode of the first diode is connected to the third wire; the connection point between the second resistor and the third resistor serves as the first detection terminal.

[0016] According to some embodiments of the present invention, the detection and protection device includes a second self-test unit comprising a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; one end of the fourth resistor is electrically connected to the first current-carrying line, and the other end is connected to one end of the fifth resistor, one end of the sixth resistor, and one end of the seventh resistor; the other end of the fifth resistor serves as the second detection terminal; the other end of the sixth resistor is connected to one end of the first shielding conductor; and the other end of the seventh resistor is connected to one end of the second shielding conductor.

[0017] According to some embodiments of the present invention, the detection and protection device includes an eighth resistor and a ninth resistor; the other end of the first shielding conductor is connected to one end of the eighth resistor, the other end of the second shielding conductor is connected to one end of the ninth resistor, and the other ends of the eighth resistor and the ninth resistor are connected to the third wire.

[0018] According to some embodiments of the present invention, the detection and protection device further includes a second diode and a third diode, the other end of the eighth resistor is connected to the anode of the second diode, the other end of the ninth resistor is connected to the anode of the third diode, and the cathodes of the second diode and the third diode are connected to the third wire.

[0019] The detection and protection device provided according to some embodiments of the present invention further includes a fourth diode, wherein the first current-carrying line is connected to the anode of the fourth diode, and the cathode of the fourth diode is electrically connected to the second resistor and the fourth resistor.

[0020] According to some embodiments of the present invention, the detection and protection device includes a response processing module comprising a fault response module and a triggering module. The fault response module is connected to the first detection terminal, the second detection terminal and the triggering module respectively, and the triggering module is connected to the fault response module, the first current-carrying line and the second current-carrying line respectively.

[0021] The fault response module 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 to output a trip trigger signal in response to the open circuit signal or the leakage current signal.

[0022] The trigger module is configured to disconnect the power connection between the input and output terminals of the power line via a switch module in response to receiving the trip trigger signal.

[0023] According to some embodiments of the present invention, the fault response module of the detection and protection device includes a first transistor, a second transistor, and a tenth resistor;

[0024] The emitter of the second transistor is connected to one end of the tenth resistor;

[0025] The base of the first transistor and the other end of the tenth resistor are both connected to the first detection terminal; the emitter of the first transistor and the base of the second transistor are both connected to the second detection terminal.

[0026] The collectors of the first transistor and the second transistor are connected together and connected to the trigger module to output the trip trigger signal to the trigger module.

[0027] According to some embodiments of the present invention, when the first current-carrying line leaks current to the first shielding conductor, a leakage current signal is sent to the first transistor through the second detection terminal, causing the first transistor to conduct so as to output the trip trigger signal to the trigger module.

[0028] According to some embodiments of the present invention, when the second current-carrying line leaks current to the second shielding conductor, a leakage current signal is sent to the second transistor through the first detection terminal, causing the second transistor to conduct so as to output the trip trigger signal to the trigger module.

[0029] According to some embodiments of the present invention, when the first shielding conductor is open-circuited and / or the second shielding conductor is open-circuited, an open-circuit signal is sent to the first transistor through the second detection terminal, causing the first transistor to conduct so as to output the trip trigger signal to the trigger module.

[0030] According to some embodiments of the present invention, the first transistor and the second transistor are PNP transistors.

[0031] In a second aspect, embodiments of the present invention provide an electrical connection device, including the detection and protection device, housing, and power cord as described in the first aspect embodiment above, wherein the power cord is connected to the housing, and the first self-test unit, the second self-test unit, and the response processing module are disposed in the housing.

[0032] Thirdly, embodiments of the present invention provide an electrical device, including a load device and an electrical connection device as described in the second aspect of the embodiments above, wherein the output end of the power line is connected to the load device.

[0033] Other features and advantages of the 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 the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0034] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0035] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0036] Figure 1 This is a circuit diagram of the detection and protection device provided in an embodiment of the present invention;

[0037] Figure 2 This is the equivalent circuit of the self-test path formed in the embodiments of the present invention;

[0038] Figure 3 This is a schematic diagram of the current signal flow direction under the condition of leakage in the first current-carrying line provided in the embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the current signal flow direction under the condition of leakage in the second current-carrying line provided in the embodiment of the present invention;

[0040] Figure 5 This is a schematic diagram of the current signal flow when the first shielding conductor is open-circuited, provided in an embodiment of the present invention.

[0041] Figure 6 This is a schematic diagram of the current signal flow when the second shielding conductor is open-circuited, provided in an embodiment of the present invention.

[0042] Figure 7 This is a schematic diagram of the current signal flow when the test switch is pressed, provided in an embodiment of the present invention.

[0043] Figure 8This is a schematic diagram of the structure of the electrical connection device provided in an embodiment of the present invention. Detailed Implementation

[0044] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention 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 overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0045] In the description of the embodiments of the present invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the number itself, while "above," "below," "within," etc. are understood to include the number itself. "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.

[0046] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this invention should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this invention 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.

[0047] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0048] A leakage circuit breaker (LCDI) is a power connection device for electrical appliances. It detects leakage current in power lines using a leakage current detection lead and disconnects the power supply to the appliance when a certain leakage current is detected, ensuring safe operation. In recent years, LCDIs have faced higher safety requirements beyond simply detecting leakage current in power lines, such as detecting open circuits in the leakage current detection lead. How to effectively and reliably detect leakage current in power lines and detect open circuits in the shielding conductors of power lines has become a problem that current power connection devices need to solve.

[0049] Based on this, embodiments of the present invention provide a power cord detection and protection device, an electrical connection device, and an electrical appliance, which can effectively and reliably realize leakage current detection of power cords and open circuit detection of the shielding conductor of power cords.

[0050] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0051] Figure 1 This is a circuit diagram of the detection and protection device provided in an embodiment of the present invention. (Refer to...) Figure 1 A first aspect of the present invention provides a power cord detection and protection device, wherein the power cord includes a first current-carrying wire 110, a second current-carrying wire 120, a third conductor 150, a first shielding conductor 130 covering the first current-carrying wire 110, and a second shielding conductor 140 covering the second current-carrying wire 120.

[0052] 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.

[0053] In addition, the third conductor 150 is the ground wire inside the power line. Therefore, in this embodiment, leakage detection of the power line and open circuit detection of the shielding conductor of the power line are achieved by using the ground wire.

[0054] Continue to refer to Figure 1 The 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.

[0055] The detection and protection device includes a self-test path module and a response processing module, wherein:

[0056] The first current-carrying line 11 is electrically connected to one end of the first shielded conductor 130 and one end of the second shielded conductor 140 through the self-test path module, and the other end of the first shielded conductor 130 and the other end of the second shielded conductor 140 are electrically connected to the third wire 150 through the self-test path module.

[0057] The response processing module is electrically connected to the self-test path module, which is used to disconnect the power connection between the input and output terminals of the power cord 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, or the second shielding conductor 140 detects a leakage signal.

[0058] According to the power cord detection and protection device provided in the embodiment of the present invention, a first shielding conductor 130 covers a first current-carrying wire 110 to collect leakage current signals of the first current-carrying wire 110, and a second shielding conductor 140 covers a second current-carrying wire 120 to collect leakage current signals of the second current-carrying wire 120. Based on this, a self-testing path module, together with the first shielding conductor 130, the second shielding conductor 140, and the third conductor 150, forms a self-testing 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 to ensure 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.

[0059] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a self-testing path module comprising a first self-testing unit 210, a second self-testing unit 220, and a third self-testing unit 230. The first self-testing unit 210 is electrically connected between the first current-carrying line 110 and the third conductor 150, and is provided with a first detection terminal X. The second self-testing unit 220 is electrically connected to the first current-carrying line 110, one end of the first shielding conductor 130, and one end of the second shielding conductor 140. Specifically, the second self-testing unit 220 is connected to a first end a near the input end of the first shielding conductor 130 and a fourth end d near the input end of the second shielding conductor 140, and is provided with a second detection terminal Y. The third self-testing unit 230 is electrically connected to the other end of the first shielding conductor 130, the other end of the second shielding conductor 140, and the third conductor 150. Specifically, the third self-testing unit 230 is connected to a second end b near the output end of the first shielding conductor 130 and a fifth end e near the output end of the second shielding conductor 140.

[0060] 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.

[0061] Understandably, the detection and protection device also includes a switching module 500 for controlling the power connection between the input and output terminals of the power cord. (Refer to...) Figure 1 As shown, the switch module 500 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 500 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 500 are open, the power connection between the input end and the output end of the power line is disconnected.

[0062] In this embodiment, the first self-test unit 210, the second self-test unit 220, and the third self-test unit 230 in the self-test path module, together with the first shielding conductor 130, the second shielding conductor 140, and the third wire 150, form an open-circuit self-test path. A first detection terminal X and a second detection terminal Y are provided. 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, triggering 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. This power cord detection and protection device can effectively and reliably detect leakage in the power cord and detect open circuits in the shielding conductors of the power cord.

[0063] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a first self-test unit 210 comprising a second resistor R2, a third resistor R3 and a first diode D1 connected in sequence; the second resistor R2 is electrically connected to a first current-carrying line 110, and the cathode of the first diode D1 is connected to a third wire 150; the connection point of the second resistor R2 and the third resistor R3 serves as the first detection terminal X.

[0064] In this embodiment, the voltage between the first current-carrying line 110 and the third wire 150 is divided by the second resistor R2 and the third resistor R3 in the first self-test unit 210 to determine the potential of the first detection terminal X.

[0065] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a second self-test unit 220 comprising a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, and a seventh resistor R7; one end of the fourth resistor R4 is electrically connected to the first current-carrying line 110, and the other end is connected to one end of the fifth resistor R5, one end of the sixth resistor R6, and one end of the seventh resistor R7; the other end of the fifth resistor R5 serves as the second detection terminal Y; the other end of the sixth resistor R6 is connected to one end of the first shielding conductor 130; and the other end of the seventh resistor R7 is connected to one end of the second shielding conductor 140.

[0066] Reference Figure 1 In some embodiments of the detection and protection device provided by the present invention, the third self-test unit 230 includes an eighth resistor R8, a ninth resistor R9, a second diode D2, and a third diode D3; the two ends of the eighth resistor R8 are respectively connected to the other end of the first shielding conductor 130 and the anode of the second diode D2, and the two ends of the ninth resistor R9 are respectively connected to the other end of the second shielding conductor 140 and the anode of the third diode D3; the cathodes of the second diode D2 and the third diode D3 are connected to the third wire 150. Specifically, the equivalent circuit of the self-test path formed by the first self-test unit 210, the second self-test unit 220, and the third self-test unit 230 in the self-test path module in conjunction with the first shielding conductor 130, the second shielding conductor 140, and the third wire 150 is as follows: Figure 2 As shown.

[0067] In this embodiment, the fourth resistor R4, fifth resistor R5, sixth resistor R6, and seventh resistor R7 in the second self-test unit 220, the eighth resistor R8, ninth resistor R9 in the third self-test unit 230, the second diode D2, and the third diode D3, together with the first shielding conductor 130, the second shielding conductor 140, and the third wire 150, 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.

[0068] Reference Figure 1 In some embodiments of the present invention, the detection and protection device also includes a test module 300. The test module 300 includes a test switch TEST and a first resistor R1. One end of the test switch TEST is connected to one end of the first resistor R1. The other end of the test switch TEST is electrically connected to the first current-carrying line 110. The other end of the first resistor R1 is connected to the first end a of the first shielding conductor 130.

[0069] In this embodiment, when the test switch TEST in the test module 300 is pressed, it is equivalent to connecting the first current-carrying line 110 to the first shielding conductor 130, that is, simulating the leakage current signal of the first current-carrying line 110 being transmitted to the first shielding conductor 130, thereby testing whether the leakage current detection function of the protection device is intact.

[0070] Understandably, the other end of the test switch TEST can also be connected to the second current-carrying line 120; the other end of the first resistor R1 can be connected to the first detection terminal X, the second detection terminal Y, or the second shielding conductor 140. All of the above settings of the test module 300 can cause a change in the potential of the first detection terminal X or the second detection terminal Y, thereby triggering the response processing module to test whether the leakage current detection function of the protection device is intact.

[0071] Reference Figure 1 In some embodiments of the present invention, the detection and protection device further includes a fourth diode D4, a first current-carrying line 110 connected to the anode of the fourth diode D4, and the cathode of the fourth diode D4 electrically connected to the second resistor R2 and the fourth resistor R4.

[0072] In this embodiment, by providing a fourth diode D4, the current flow can be limited to flow from the first current-carrying line 110 through the fourth diode D4 to the second resistor R2 in the first self-test unit 210, or through the fourth diode D4 to the fourth resistor R4 in the second self-test unit 220, and cannot flow in the opposite direction to the first current-carrying line 110.

[0073] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a fault response module 410 and a trigger module 420. The fault response module 410 is connected to the first detection terminal X, the second detection terminal Y and the trigger module 420 respectively. The trigger module 420 is connected to the fault response module 410, the first current-carrying line 110 and the second current-carrying line 120 respectively.

[0074] The fault response module 410 is used to acquire the open circuit signal generated when the first shielding conductor 130 or the second shielding conductor 140 is open, and to acquire the leakage current signal detected by the first shielding conductor 130 or the second shielding conductor 140, and outputs a trip trigger signal in response to the open circuit signal or the leakage current signal.

[0075] Trigger module 420 is configured to disconnect the power connection between the input and output terminals of the power line via switch module 500 in response to receiving a trip trigger signal.

[0076] Reference Figure 1 In some embodiments of the present invention, the fault response module 410 includes a first transistor Q1, a second transistor Q2 and a tenth resistor R10.

[0077] The emitter of the second transistor Q2 is connected to one end of the tenth resistor R10;

[0078] The base of the first transistor Q1 and the other end of the tenth resistor R10 are both connected to the first detection terminal X; the emitter of the first transistor Q1 and the base of the second transistor Q2 are both connected to the second detection terminal Y.

[0079] The collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and connected to the trigger module 420 to output a trip trigger signal to the trigger module 420.

[0080] In this embodiment, when the voltage received at the emitter of the first transistor Q1 is greater than the voltage received at the base of the first transistor Q1, the emitter junction of the first transistor Q1 is forward-biased and thus conducts, thereby outputting a trip trigger signal to the trigger module 420 through the collector of the first transistor Q1; similarly, 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 trip trigger signal to the trigger module 420 through the collector of the second transistor Q2.

[0081] Reference Figure 1 In some embodiments of the present invention, the detection and protection device includes a trigger module 420 comprising a thyristor Q3, a thyristor drive module 421, and a trip coil Lx for generating electromagnetic force to drive the switch module 500 to disconnect the power connection. The thyristor drive module 421 includes a twelfth resistor R12, a thirteenth resistor R13, and a first capacitor C1. A first current-carrying line 110 is connected to one end of the trip coil Lx through a fourth diode D4. The other end of the trip coil Lx is connected to the anode of the thyristor Q3. The cathode of the thyristor Q3 is connected to the anode of the first diode D1. The cathode of the first diode D1 is connected to the third wire 150. The collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and connected to one end of the twelfth resistor R12. The other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13, one end of the first capacitor C1, and the control electrode of the thyristor Q3. The other end of the thirteenth resistor R13 and the other end of the first capacitor C1 are both connected to the connection point between the thyristor Q3 and the first diode D1.

[0082] In this embodiment, when a trip trigger signal is output from the collector of the first transistor Q1 or the collector of the second transistor Q2 to the thyristor drive module 421, the trip trigger signal charges the first capacitor C1 after passing through the twelfth resistor R12, and the potential of the control electrode of the thyristor Q3 rises. When 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110-the fourth diode D4-the trip coil Lx-the thyristor Q3-the first diode D1-the third wire 150; the trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0083] Reference Figure 1 In some embodiments of the detection and protection device provided by the present invention, the trigger module 420 further includes a first varistor ZR1. One end of the first varistor ZR1 is connected to the anode of the thyristor Q3, and the other end of the first varistor ZR1 is connected to the second current-carrying line 120. 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, connecting the first varistor ZR1 to the thyristor Q3 can protect the thyristor Q3 from damage.

[0084] Reference Figure 1 In some embodiments of the present invention, the detection and protection device also includes an indicator module 600. The indicator module 600 includes an eleventh resistor R11, a fourteenth resistor R14 and a light-emitting diode LED1 connected in series. One end of the eleventh resistor R11 is connected to the connection point of the fourth diode D4 and the trip coil Lx. The cathode of the light-emitting diode LED1 is connected to the second current-carrying line 120.

[0085] Reference Figure 1 In some embodiments of the present invention, the detection and protection device further includes a lightning protection module 700. The lightning protection module 700 includes a second varistor ZR2, one end of which is connected to the second current-carrying line 120, and the other end is connected to the cathode of the fourth diode D4. 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, placing the second varistor ZR2 before the first current-carrying line 110 and the second current-carrying line 120 can protect subsequent components in the detection and protection device from damage caused by lightning voltage.

[0086] Reference Figure 1In some embodiments of the present invention, the detection and protection device further includes a fifth diode D5 and a sixth diode D6. The anodes of the fifth diode D5 and the sixth diode D6 are connected to the second current-carrying line 120. The cathode of the fifth diode D5 is connected to the connection point of the trip coil Lx and the thyristor Q3. The cathode of the sixth diode D6 is connected to the connection point of the fourth diode D4 and the trip coil Lx. It is understood that the arrangement of the fifth diode D5 and the sixth diode D6 provides two different freewheeling circuits to form corresponding current loops.

[0087] Below, with Figure 1 The illustrated embodiments describe the operation of the detection and protection device provided by the present invention under various leakage and open circuit conditions:

[0088] 1. When the first current-carrying line 110 leaks current to the first shielding conductor 130, a leakage signal is sent to the first transistor Q1 through the second detection terminal Y, causing the first transistor Q1 to conduct and output a trip trigger signal to the trigger module 420.

[0089] Specifically, after the first shielding conductor 130 receives the leakage signal, it refers to... Figure 3 As shown, the current provided by the first current-carrying line 110 flows from the first terminal a through the sixth resistor R6 and the fourth resistor R4 to the second resistor R2, the third resistor R3 and the first diode D1, and through the sixth resistor R6 and the fifth resistor R5 to the second detection terminal Y, so that the voltage received at the emitter of the first transistor Q1 is greater than the voltage at the base, causing the first transistor Q1 to conduct; on the other hand, there is also such as Figure 3 Other current flow directions indicated by the arrows;

[0090] After the first transistor Q1 is turned on, the leakage signal flows through the first transistor Q1 and from the collector of the first transistor Q1 to the twelfth resistor R12, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q3 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of first current-carrying line 110 - fourth diode D4 - trip coil Lx - thyristor Q3 - first diode D1 - third wire 150.

[0091] The trip coil Lx generates a strong electromagnetic force, which drives the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0092] 2. When the second current-carrying line 120 leaks current to the second shielding conductor 140, a leakage signal is sent to the second transistor Q2 through the first detection terminal X, causing the second transistor Q2 to conduct and output a trip trigger signal to the trigger module 420.

[0093] Specifically, after the first shielding conductor 130 receives the leakage signal, it refers to... Figure 4 As shown, the current provided by the first current-carrying line 110 flows through the fourth resistor R4 to the connection point of the sixth resistor R6 and the seventh resistor R7, then through the sixth resistor R6 to the first end a of the first shielding conductor 130 and through the seventh resistor R7 to the fourth end of the second shielding conductor 140; on the other hand, it flows directly to the second resistor R2, the third resistor R3 and the first diode D1, and from the first detection terminal X to the emitter of the second transistor Q2, so that the emitter of the second transistor Q2 receives a voltage greater than the base voltage, causing the second transistor Q2 to conduct; in addition, there are also... Figure 4 Other current flow directions indicated by the arrows;

[0094] 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 twelfth resistor R12, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q3 increases. When 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110 - the fourth diode D4 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the third wire 150.

[0095] The trip coil Lx generates a strong electromagnetic force, which drives the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0096] 3. When the first shielding conductor 130 is open-circuited, an open-circuit signal is sent to the first transistor Q1 through the second detection terminal Y, causing the first transistor Q1 to conduct and output a trip trigger signal to the trigger module 420.

[0097] Specifically, after the first shielding conductor 130 becomes open-circuited, refer to Figure 5 As shown, the current provided by the first current-carrying line 110 flows sequentially through the second resistor R2, the third resistor R3, and the first diode D1. On the other hand, it flows through the fourth resistor R4 to the connection point of the fifth resistor R5 and the seventh resistor R7, then through the fifth resistor R5 to the second detection terminal Y, and through the seventh resistor R7 to the fourth terminal d of the second shielding conductor 140. This causes the voltage received at the emitter of the first transistor Q1 to be greater than the voltage at its base, thus turning on the first transistor Q1. Additionally, there are other... Figure 5 Other current flow directions indicated by the arrows;

[0098] After the first transistor Q1 is turned on, the current flows from the second detection terminal Y through the first transistor Q1 and from the collector of the first transistor Q1 to the twelfth resistor R12, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q3 increases. When 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110 - the fourth diode D4 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the third wire 150.

[0099] The trip coil Lx generates a strong electromagnetic force, which drives the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0100] 4. When the second shielding conductor 140 is open-circuited, an open-circuit signal is sent to the first transistor Q1 through the second detection terminal Y, causing the first transistor Q1 to conduct and output a trip trigger signal to the trigger module 420.

[0101] Specifically, after the second shielding conductor 140 becomes open-circuited, refer to Figure 6 As shown, the current provided by the first current-carrying line 110 flows sequentially through the second resistor R2, the third resistor R3, and the first diode D1. On the other hand, it flows through the fourth resistor R4 to the connection point of the fifth resistor R5 and the sixth resistor R6, then through the fifth resistor R5 to the second detection terminal Y, and through the sixth resistor R6 to the first terminal a of the first shielding conductor 130. This causes the voltage received at the emitter of the first transistor Q1 to be greater than the voltage at its base, thus turning on the first transistor Q1. Additionally, there are other... Figure 6 Other current flow directions indicated by the arrows;

[0102] After the first transistor Q1 is turned on, the current flows from the second detection terminal Y through the first transistor Q1 and from the collector of the first transistor Q1 to the twelfth resistor R12, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q3 increases. When 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110 - the fourth diode D4 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the third wire 150.

[0103] The trip coil Lx generates a strong electromagnetic force, which drives the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0104] 5. When the test switch TEST is pressed: a current signal is sent to the first transistor Q1 through the second detection terminal Y, so that the first transistor Q1 is turned on, and a trip trigger signal is output to the trigger module 420.

[0105] Specifically, after the test switch TEST is pressed, refer to Figure 7 As shown, the current supplied by the test switch TEST and the first resistor R1 flows sequentially through the sixth resistor R6, the fourth resistor R4, the second resistor R2, the third resistor R3 and the first diode D1; secondly, it flows to the first terminal a of the first shielding conductor 130; and thirdly, it flows through the sixth resistor R6 and the fifth resistor R5 to the second detection terminal Y, causing the emitter of the first transistor Q1 to receive a voltage greater than the base voltage, thus turning on the first transistor Q1. Additionally, there are also... Figure 7 Other current flow directions indicated by the arrows;

[0106] After the first transistor Q1 is turned on, the current flows from the second detection terminal Y through the first transistor Q1 and from the collector of the first transistor Q1 to the twelfth resistor R12, charging the first capacitor C1. The voltage of the control electrode of the thyristor Q3 increases. When 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 third wire 150, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying line 110 - the fourth diode D4 - the trip coil Lx - the thyristor Q3 - the first diode D1 - the third wire 150.

[0107] The trip coil Lx generates a strong electromagnetic force, which drives the switch module 500 to disconnect the power connection between the input and output terminals of the power supply line.

[0108] Reference Figure 1 In some embodiments of the present invention, the first transistor Q1 and the second transistor Q2 are PNP transistors.

[0109] According to the power cord detection and protection device provided in the embodiment of the present invention, the first self-test unit 210, the second self-test unit 220 and the third self-test unit 230 in the self-test path module, together with the first shielding conductor 130, the second shielding conductor 140 and the third wire 150, 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 potential of the first detection terminal X and the second detection terminal Y is constant and will not trigger the response processing module to act; when leakage or open circuit occurs, the potential of the first detection terminal X and the second detection terminal Y changes, which will trigger the response processing module to act, thereby disconnecting the power connection between the input and output terminals of the power cord, ensuring the power supply safety of the power cord; the 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.

[0110] Reference Figure 8A second aspect of the present invention provides an electrical connection device 800, including a 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 first self-test unit 210, a second self-test unit 220, and a response processing module are disposed in the housing 810.

[0111] In addition, a third aspect of the present invention provides an electrical device including a load device and an electrical connection device 800 as described in the second aspect of the present invention, wherein the output end of the power line is connected to the load device.

[0112] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention 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 invention.

Claims

1. A detection protection device for a power cord, characterized by, The power line comprises a first current-carrying wire, a second current-carrying wire, a third wire, a first shielding conductor covering the first current-carrying wire, and a second shielding conductor covering the second current-carrying wire, and the detection protection device comprises: A self-checking path module comprising a first self-checking unit, a second self-checking unit, and a third self-checking unit; the first self-checking unit is electrically connected between the first current-carrying wire and the third wire; the second self-checking unit is electrically connected to the first current-carrying wire, one end of the first shielding conductor, and one end of the second shielding conductor; the third self-checking unit is electrically connected to the other end of the first shielding conductor, the other end of the second shielding conductor, and the third wire; A response processing module electrically connected to the first self-checking unit and the second self-checking unit, for disconnecting the power connection between the input end and the output end of the power line in the case that the first shielding conductor is open, the second shielding conductor is open, the first shielding conductor detects a leakage signal, and / or the second shielding conductor detects a leakage signal.

2. The detection protection device according to claim 1, characterized in that, The first self-checking unit is provided with a first detection end; the second self-checking unit is provided with a second detection end; the response processing module is electrically connected to the first detection end, the second detection end, the first current-carrying wire, and the second current-carrying wire.

3. The detection protection device according to claim 2, characterized in that, Further comprising a test module, the test module comprising a test switch and a first resistor, one end of the test switch being connected to one end of the first resistor; The other end of the test switch is connected to one of the first current-carrying wire and the second current-carrying wire; The other end of the first resistor is connected to one of the first detection end, the second detection end, the first shielding conductor, and the second shielding conductor.

4. The detection protection device according to claim 2, characterized in that, The first self-checking unit comprises a second resistor, a third resistor, and a first diode connected in sequence; the second resistor is electrically connected to the first current-carrying wire, and the cathode of the first diode is connected to the third wire; the connection point of the second resistor and the third resistor serves as the first detection end.

5. The detection protection device according to claim 4, characterized in that The second self-checking unit comprises a fourth resistor, a fifth resistor, a sixth resistor, and a seventh resistor; one end of the fourth resistor is electrically connected to the first current-carrying wire, and the other end is connected to one end of the fifth resistor, one end of the sixth resistor, and one end of the seventh resistor; the other end of the fifth resistor serves as the second detection end; the other end of the sixth resistor is connected to one end of the first shielding conductor; the other end of the seventh resistor is connected to one end of the second shielding conductor.

6. The detection protection device according to claim 4, characterized in that, The third self-checking unit comprises an eighth resistor and a ninth resistor; the other end of the first shielding conductor is connected to one end of the eighth resistor, and the other end of the second shielding conductor is connected to one end of the ninth resistor; the other end of the eighth resistor and the other end of the ninth resistor are connected to the third wire.

7. The detection protection device according to claim 6, characterized in that The third self-checking unit further comprises a second diode and a third diode; the other end of the eighth resistor is connected to the anode of the second diode, the other end of the ninth resistor is connected to the anode of the third diode, and the cathode of the second diode and the cathode of the third diode are connected to the third wire.

8. The detection protection apparatus according to claim 5, characterized by A fourth diode is further included, an anode of the fourth diode is connected to the first current-carrying line, and a cathode of the fourth diode is electrically connected to the second resistor and the fourth resistor.

9. The detection protection apparatus according to claim 2, characterized by The response processing module comprises a fault response module and a trigger module, the fault response module is connected to the first detection end, the second detection end and the trigger module respectively, and the trigger module is connected to the fault response module, the first current-carrying line and the second current-carrying line respectively. The fault response module is configured to acquire an open circuit signal generated by the first shielding conductor and / or the second shielding conductor in an open circuit condition, acquire a leakage signal detected by the first shielding conductor and / or the second shielding conductor, and output a trip trigger signal in response to the open circuit signal or the leakage signal. The trigger module is configured to disconnect the power connection between the input end and the output end of the power line through a switch module in response to receiving the trip trigger signal.

10. The detection protection device according to claim 9, characterized in that The fault response module comprises a first triode, a second triode and a tenth resistor. An emitter of the second triode is connected to one end of the tenth resistor. A base of the first triode and the other end of the tenth resistor are both connected to the first detection end, and an emitter of the first triode and a base of the second triode are both connected to the second detection end. A collector of the first triode and a collector of the second triode are connected together and connected to the trigger module to output the trip trigger signal to the trigger module.

11. The detection protection device according to claim 10, characterized in that When the first current-carrying line leaks to the first shielding conductor, a leakage signal is sent to the first triode through the second detection end, so that the first triode is turned on to output the trip trigger signal to the trigger module.

12. The detection protection device according to claim 10, characterized in that, When the second current-carrying line leaks to the second shielding conductor, a leakage signal is sent to the second triode through the first detection end, so that the second triode is turned on to output the trip trigger signal to the trigger module.

13. The detection protection apparatus according to claim 10, characterized by When the first shielding conductor is in an open circuit condition and / or the second shielding conductor is in an open circuit condition, an open circuit signal is sent to the first triode through the second detection end, so that the first triode is turned on to output the trip trigger signal to the trigger module.

14. The detection protection device according to claim 10, characterized by The first triode and the second triode are PNP type triodes.

15. An electrical connection device, characterized by The detection protection device, the housing and the power line are connected to each other, the first self-checking unit, the second self-checking unit and the response processing module are arranged in the housing.

16. An electrical device, characterized by The detection protection device, the housing and the power line are connected to each other, the first self-checking unit, the second self-checking unit and the response processing module are arranged in the housing. The detection protection device, the housing and the power line are connected to each other, the first self-checking unit, the second self-checking unit and the response processing module are arranged in the housing.

Images