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

Abstract

The application discloses a detection protection device of a power line, an electric connection device and an electric equipment. The power line comprises a first current-carrying wire, a second current-carrying wire, a first shielding conductor and a second shielding conductor. The detection protection device comprises a self-checking path module, a high-frequency coupling injection module, a coupling receiving module and a response processing module. The self-checking path module is electrically connected with the first current-carrying wire, the first shielding conductor, the second current-carrying wire and the second shielding conductor to build a high-frequency detection path. The high-frequency coupling injection module is used for injecting a high-frequency signal into the high-frequency detection path. The coupling receiving module is used for receiving the high-frequency signal from the high-frequency detection path. The response processing module is used for disconnecting the power connection between the input end and the output end of the power line according to the high-frequency signal in the case of open circuit and / or detection of a leakage signal. The detection protection device of the power line can effectively and reliably realize the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

Description

TECHNICAL FIELD

[0001] The present application relates to the electrical technical field, and in particular to a detection protection device of a power cord, an electrical connection device and an electrical equipment. BACKGROUND

[0002] Leakage Circuit Detector Interrupter (LCDI) is a kind of power connection device for electrical appliances, which can detect the leakage current of the power cord set through the leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected, to ensure safety in use. In recent years, in addition to detecting the leakage current of the power cord through the leakage current detection line, LCDI also needs to detect higher safety detection requirements, such as detecting whether the leakage current detection line is open.

[0003] How to effectively and reliably realize the leakage detection of the power cord and the open circuit detection of the shielded conductor of the power cord has become a problem to be solved for the current power connection device. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art, and provides a detection protection device of a power cord, an electrical connection device and an electrical equipment, which can effectively and reliably realize the leakage detection of the power cord and the open circuit detection of the shielded conductor of the power cord.

[0005] In a first aspect, the present application provides a detection protection device of a power cord, the power cord comprising a first current-carrying wire, a second current-carrying wire, a first shielded conductor covering the first current-carrying wire, and a second shielded conductor covering the second current-carrying wire, the detection protection device comprising a self-checking path module, a high-frequency coupling injection module, a coupling receiving module and a response processing module, wherein:

[0006] The self-checking path module is electrically connected to the first current-carrying wire, the first shielded conductor, the second current-carrying wire and the second shielded conductor to construct a high-frequency detection path;

[0007] The high-frequency coupling injection module is configured to inject a high-frequency signal into the high-frequency detection path;

[0008] The coupling receiving module is configured to receive a high-frequency signal from the high-frequency detection path;

[0009] The response processing module is electrically connected with the high-frequency coupling injection module and the coupling receiving module, and is configured to disconnect the power connection between the input end and the output end of the power line according to the high-frequency signal 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.

[0010] The power line detection protection device provided by the embodiment of the present application has at least the following beneficial effects: a high-frequency detection path is formed by adopting a self-checking path module in cooperation with a first current-carrying line, a second current-carrying line, a first shielding conductor and a second shielding conductor, and a high-frequency signal is injected into the high-frequency detection path, the high-frequency signal is received by a coupling receiving module after flowing through the high-frequency detection path, and is transmitted to a response processing module, in the case that a leakage or an open circuit occurs, the response processing module disconnects the power connection between the input end and the output end of the power line, and the safety of the power supply of the power line is ensured; the power line detection protection device can effectively and reliably realize leakage detection of the power line and open circuit detection of the shielding conductor of the power line.

[0011] According to some embodiments of the present application, the self-checking path module comprises a first capacitor and a second capacitor, the first capacitor is electrically connected with the first current-carrying line and the first shielding conductor, and the second capacitor is electrically connected with the second current-carrying line and the second shielding conductor.

[0012] According to some embodiments of the present application, the first shielding conductor comprises a first end close to the input end of the power line and a second end close to the output end of the power line, and the second shielding conductor comprises a fourth end close to the input end of the power line and a fifth end close to the output end of the power line.

[0013] According to some embodiments of the present application, the self-checking path module further comprises a first connecting conductor electrically connected with the first shielding conductor and the second shielding conductor.

[0014] According to some embodiments of the present application, the self-checking path module comprises one of the following cases:

[0015] Case one: the first capacitor is connected with the first current-carrying line and the second end, the second capacitor is connected with the second current-carrying line and the fifth end, and the first connecting conductor is connected with the first end and the fourth end;

[0016] Case two: the first capacitor is connected with the first current-carrying line and the first end, the second capacitor is connected with the second current-carrying line and the fourth end, and the first connecting conductor is connected with the second end and the fifth end.

[0017] According to some embodiments of the present application, the high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line, and the coupling receiving module is arranged on one side of the second current-carrying line close to the input end of the power line.

[0018] According to some embodiments of the present application, the first capacitor connects the first current-carrying line and the first end, and the second capacitor connects the second current-carrying line and the fourth end.

[0019] The high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line.

[0020] The coupling receiving module is arranged on the first shielding conductor close to the first end and on the second shielding conductor close to the fourth end.

[0021] According to some embodiments of the present application, the first capacitor connects the first current-carrying line and the first end, and the second capacitor connects the second current-carrying line and the fourth end.

[0022] The self-checking path module further includes a second connecting conductor connected to the second end and a third connecting conductor connected to the fifth end.

[0023] The high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line and on one side of the second current-carrying line close to the input end of the power line.

[0024] The coupling receiving module is arranged on the second connecting conductor and the third connecting conductor.

[0025] According to some embodiments of the present application, the response processing module includes a control module and a trigger module connected in sequence.

[0026] The control module is configured to control the high-frequency coupling injection module to inject a high-frequency signal into the high-frequency detection path, acquire the high-frequency signal received by the coupling receiving module, and output a trip trigger signal in a case where the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received.

[0027] The trigger module is configured to, in response to receiving the trip trigger signal, disconnect the power connection between the input end and the output end of the power line through the switch module.

[0028] According to some embodiments of the present application, when the first current-carrying wire leaks to the first shielded conductor and / or the second current-carrying wire leaks to the second shielded conductor, the high-frequency coupling injection module injects a high-frequency signal into the high-frequency detection path, and a phase difference between the high-frequency signal injected by the high-frequency coupling injection module and the high-frequency signal received by the coupling receiving module falls within a preset range, the preset range being 0°±10° or 180°±10°.

[0029] According to some embodiments of the present application, when the first shielded conductor and / or the second shielded conductor is in an open circuit state, the coupling receiving module does not receive a high-frequency signal.

[0030] According to some embodiments of the present application, the detection protection device further comprises a direct-current power supply module, configured to supply power to at least one of the high-frequency coupling injection module, the coupling receiving module, the control module and the triggering module.

[0031] According to some embodiments of the present application, the detection protection device further comprises a test module, the test module comprising a test switch electrically connected to an output end of the direct-current power supply module and the control module.

[0032] When the test switch is not pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a first period into the high-frequency detection path.

[0033] When the test switch is pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a second period into the high-frequency detection path.

[0034] In a second aspect, an embodiment of the present application provides an electrical connection device, comprising the detection protection device, a housing and a power supply line as described in the first aspect, the power supply line being connected to the housing, and the response processing module being arranged in the housing.

[0035] In a third aspect, an embodiment of the present application provides a power utilization device, comprising a load device and the electrical connection device as described in the second aspect, an output end of the power supply line being connected to the load device.

[0036] Other features and advantages of the present application will be further described in the following description with reference to the drawings, and will be apparent from the description, or will be learned from the practice of the application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0037] The accompanying drawings are used to provide further understanding of the technical solutions of the present application and constitute a part of the specification, and are used to explain the technical solutions of the present application together with embodiments of the present application, and do not constitute a limitation on the technical solutions of the present application.

[0038] The present application is further illustrated below in conjunction with the drawings and embodiments.

[0039] Figure 1 is a circuit principle diagram of the detection protection device provided by the first embodiment of the present application;

[0040] Figure 2 is a circuit principle diagram of the detection protection device provided by the second embodiment of the present application;

[0041] Figure 3 is a circuit principle diagram of the detection protection device provided by the third embodiment of the present application;

[0042] Figure 4 is a circuit principle diagram of the detection protection device provided by the fourth embodiment of the present application;

[0043] Figure 5 is a refined circuit principle diagram of the response processing module of the detection protection device provided by the first embodiment of the present application;

[0044] Figure 6 is a flow chart of the action situation of the detection protection device provided by the present application;

[0045] Figure 7 is a structural schematic diagram of the electric connection equipment provided by the present application. DETAILED DESCRIPTION

[0046] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the drawings, and the role of the drawings is to supplement the description of the text part of the specification, so that people can intuitively and visually understand each technical feature and the overall technical solution of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0047] In the description of the embodiments of the present application, one or more is meant to be one or more, more than two is meant to be two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, within, etc. are understood as including the number, "at least one" means one or more, "at least one of the following" and the like means any combination of these items, including any combination of single or multiple items. If there is a description of "first", "second", etc., it is only used to distinguish technical features for the purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0048] It should be noted that the terms such as setting, installing and connecting in the embodiments of the present application should be understood in a broad sense, and the skilled in the art can determine the specific meaning of the above terms in the embodiments of the present application in combination with the specific content of the technical solutions. For example, the term "connection" can be mechanical connection, electrical connection or mutual communication; it can be direct connection or indirect connection through an intermediate medium.

[0049] It should be noted that the technical features involved in each embodiment of the present application described below can be combined with each other as long as there is no conflict.

[0050] Leakage Circuit Detector Interrupter (LCDI) is a kind of power connection device for electrical appliances, which can detect the leakage current of the power line set through the leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected, to ensure safety in use. In recent years, in addition to detecting the leakage current of the power line through the leakage current detection line, the LCDI also needs to meet higher safety detection requirements, such as detecting whether the leakage current detection line is open. How to effectively and reliably realize the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line has become a problem to be solved for the current power connection device.

[0051] Therefore, based on this, the embodiments of the present application provide a kind of detection protection device of power line, electrical connection equipment and electric equipment, can effectively and reliably realize the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

[0052] The embodiments of the present application will be further described below with reference to the accompanying drawings.

[0053] Figure 1 It is the circuit schematic diagram of the detection protection device provided by the embodiments of the present application. Referring to Figure 1 The first aspect embodiment of the present application provides a kind of detection protection device of power line, and the power line includes first current-carrying wire 110, second current-carrying wire 120, first shielding conductor 130 covering first current-carrying wire 110 and second shielding conductor 140 covering second current-carrying wire 120.

[0054] It can be understood that when the power cord supplies power to the electrical equipment using two-phase alternating current, it can be one of the following two cases: the first current-carrying line 110 is the live wire L, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L. When the power cord supplies power to the electrical equipment using three-phase alternating current, it can be one of the following three cases: the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the neutral wire N; the first current-carrying line 110 is the neutral wire N, and the second current-carrying line 120 is the live wire L1; the first current-carrying line 110 is the live wire L1, and the second current-carrying line 120 is the live wire L2. Hereinafter, the case shown in Figure 1 , that is, the first current-carrying line 110 is the live wire L, and the second current-carrying line 120 is the neutral wire N, is taken as an example for description, and the remaining cases can be obtained by analogy.

[0055] Continuing to refer to Figure 1 , the first shielding conductor 130 is used to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor 140 is used to collect the leakage signal of the second current-carrying line 120; the first shielding conductor 130 includes a first end a close to the input end of the power cord and a second end b close to the output end of the power cord; the second shielding conductor 140 includes a fourth end d close to the input end and a fifth end e close to the output end.

[0056] The detection protection device includes a self-checking path module, a high-frequency coupling injection module 310, a coupling receiving module 320, and a response processing module 400, wherein:

[0057] The self-checking path module is electrically connected to the first current-carrying line 110, the first shielding conductor 130, the second current-carrying line 120, and the second shielding conductor 140 to construct a high-frequency detection path.

[0058] The high-frequency coupling injection module 310 is used to inject a high-frequency signal into the high-frequency detection path.

[0059] The coupling receiving module 320 is used to receive the high-frequency signal from the high-frequency detection path.

[0060] The response processing module 400 is electrically connected to the high-frequency coupling injection module 310 and the coupling receiving module 320, and is used to disconnect the power connection between the input end and the output end of the power cord in the case 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, according to the high-frequency signal.

[0061] It can be understood that the detection protection device further includes a switch module 500 for controlling the power connection between the input end and the output end of the power cord. Referring to Figure 1As 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 turned on; when the switch terminals of the switch module 500 are opened, the power connection between the input end and the output end of the power line is disconnected.

[0062] The detection protection device for the power line provided by the embodiment of the present application, by adopting the self-checking path module, the first current-carrying line 110, the second current-carrying line 120, the first shielding conductor 130 and the second shielding conductor 140 to form a high-frequency detection path, and injecting a high-frequency signal into the high-frequency detection path, the high-frequency signal is received by the coupling receiving module 320 after flowing through the high-frequency detection path, and is transmitted to the response processing module 400, when the leakage or open circuit occurs, the response processing module 400 is used to disconnect the power connection between the input end and the output end of the power line, so as to ensure the safety of the power supply of the power line; the detection protection device for the power line can effectively and reliably realize the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

[0063] Reference Figure 1 In the detection protection device provided by some embodiments of the present application, the self-checking path module includes a first capacitor Zc1 and a second capacitor Zc2, the first capacitor Zc1 is electrically connected to the first current-carrying line 110 and the first shielding conductor 130, and the second capacitor Zc2 is electrically connected to the second current-carrying line 120 and the second shielding conductor 140.

[0064] In this embodiment, the first current-carrying line 110, the first capacitor Zc1 and the first shielding conductor 130 connected in sequence constitute a separate high-frequency detection path or a part of a high-frequency detection path, and the second current-carrying line 120, the second capacitor Zc2 and the second shielding conductor 140 connected in sequence constitute a separate high-frequency detection path or a part of a high-frequency detection path. The first capacitor Zc1 and the second capacitor Zc2 are capacitive impedance devices, which can allow high-frequency signals to pass through and block low-frequency signals, so that the first capacitor Zc1 can transmit high-frequency signals on the first current-carrying line 110 to the first shielding conductor 130, or transmit high-frequency signals on the first shielding conductor 130 to the first current-carrying line 110; the second capacitor Zc2 can transmit high-frequency signals on the second current-carrying line 120 to the second shielding conductor 140, or transmit high-frequency signals on the second shielding conductor 140 to the second current-carrying line 120.

[0065] Reference Figure 1 and Figure 2 In the detection protection device provided by some embodiments of the present application, the self-checking path module further includes a first connecting conductor 210 electrically connected to the first shielding conductor 130 and the second shielding conductor 140.

[0066] In the embodiment, through the first connecting conductor 210, the high frequency detection path composed of the first current-carrying wire 110, the first capacitor Zc1 and the first shielding conductor 130 and the high frequency detection path composed of the second current-carrying wire 120, the second capacitor Zc2 and the second shielding conductor 140 are connected to form an integral high frequency detection path. Specifically, the self-checking path module includes one of the following cases:

[0067] Case one: the first capacitor Zc1 connects the first current-carrying wire 110 and the second end b, the second capacitor Zc2 connects the second current-carrying wire 120 and the fifth end e, and the first connecting conductor 210 connects the first end a and the fourth end d; for example, as shown in FIG. 1, a complete high frequency detection path of the first current-carrying wire 110-first capacitor Zc1-second end b-first shielding conductor 130-first end a-first connecting conductor 210-fourth end d-second shielding conductor 140-fifth end e-second capacitor Zc2-second current-carrying wire 120 is formed, and the open circuit detection or the leakage detection of the first shielding conductor 130 and the second shielding conductor 140 is simultaneously realized. Figure 1

[0068] Case two: the first capacitor Zc1 connects the first current-carrying wire 110 and the first end a, the second capacitor Zc2 connects the second current-carrying wire 120 and the fourth end d, and the first connecting conductor 210 connects the second end b and the fifth end e; for example, as shown in FIG. 2, a complete high frequency detection path of the first current-carrying wire 110-first capacitor Zc1-first end a-first shielding conductor 130-second end b-first connecting conductor 210-fifth end e-second shielding conductor 140-fourth end d-second capacitor Zc2-second current-carrying wire 120 is formed, and the open circuit detection or the leakage detection of the first shielding conductor 130 and the second shielding conductor 140 is simultaneously realized. Figure 2

[0069] Referring to FIGS. 1 and 2, in the self-checking path module provided by some embodiments of the present application, the high frequency coupling injection module 310 is arranged on one side of the first current-carrying wire 110 close to the input end of the power line, and the coupling receiving module 320 is arranged on one side of the second current-carrying wire 120 close to the input end of the power line. Figure 1 Figure 2 In the detection protection device provided by some embodiments of the present application, the high frequency coupling injection module 310 is arranged on one side of the first current-carrying wire 110 close to the input end of the power line, and the coupling receiving module 320 is arranged on one side of the second current-carrying wire 120 close to the input end of the power line.

[0070] ​​​In the embodiment, the high-frequency coupling injection module 310 injects high-frequency signals into the first current-carrying line 110 from the side close to the input end of the power line, the high-frequency signals are transmitted to the first shielding conductor 130 through the first capacitor Zc1, the high-frequency signals completely flow through the first shielding conductor 130 and then are transmitted to the second shielding conductor 140 through the first connecting conductor 210, the high-frequency signals completely flow through the second shielding conductor 140 and then are transmitted to the second current-carrying line 120 through the second capacitor Zc2, and finally the high-frequency signals are received by the coupling receiving module 320 on the side close to the input end of the power line of the second current-carrying line 120 and are transmitted to the control module 410 for processing.

[0071] With reference to Figure 3 In another embodiment of the detection protection device, the first capacitor Zc1 connects the first current-carrying line 110 and the second end b, and the second capacitor Zc2 connects the second current-carrying line 120 and the fifth end e.

[0072] The high-frequency coupling injection module 310 is arranged on the side close to the input end of the power line of the first current-carrying line 110 and the side close to the input end of the power line of the second current-carrying line 120.

[0073] The coupling receiving module 320 is arranged on the position close to the first end a of the first shielding conductor 130 and the position close to the fourth end d of the second shielding conductor 140.

[0074] In the embodiment, no conductor is arranged to connect the first shielding conductor 130 and the second shielding conductor 140, the first current-carrying line 110, the first capacitor Zc1 and the first shielding conductor 130 connected in sequence form a separate high-frequency detection path, the high-frequency coupling injection module 310 arranged on the side close to the input end of the power line of the first current-carrying line 110 injects high-frequency signals into the first current-carrying line 110, the high-frequency signals are transmitted to the first shielding conductor 130 through the first capacitor Zc1, the high-frequency signals completely flow through the first shielding conductor 130 and then are received by the coupling receiving module 320 on the position close to the first end a of the first shielding conductor 130, and are transmitted to the control module 410 for analysis; similarly, the second current-carrying line 120, the second capacitor Zc2 and the second shielding conductor 140 connected in sequence form another separate high-frequency detection path, the high-frequency coupling injection module 310 arranged on the side close to the input end of the power line of the second current-carrying line 120 injects high-frequency signals into the second current-carrying line 120, the high-frequency signals are transmitted to the second shielding conductor 140 through the second capacitor Zc2, the high-frequency signals completely flow through the second shielding conductor 140 and then are received by the coupling receiving module 320 on the position close to the fourth end d of the second shielding conductor 140, and are transmitted to the control module 410 for processing.

[0075] With reference toFigure 4 In the detection protection device provided in another embodiment of the present application, the first capacitor Zc1 is connected to the first current-carrying line 110 and the first end a; and the second capacitor Zc2 is connected to the second current-carrying line 120 and the fourth end d.

[0076] The self-checking path module further comprises a second connecting conductor 220 connected to the second end b and a third connecting conductor 230 connected to the fifth end e.

[0077] The high-frequency coupling injection module 310 is arranged on the side of the first current-carrying line 110 close to the input end of the power line and on the side of the second current-carrying line 120 close to the input end of the power line.

[0078] The coupling receiving module 320 is arranged on the second connecting conductor 220 and the third connecting conductor 230.

[0079] In the embodiment, the first shielding conductor 130 and the second shielding conductor 140 are not connected by a conductor, and the first current-carrying line 110, the first capacitor Zc1, the first shielding conductor 130 and the second connecting conductor 220 connected in sequence form a separate high-frequency detection path. The high-frequency coupling injection module 310 arranged on the side of the first current-carrying line 110 close to the input end of the power line injects a high-frequency signal into the first current-carrying line 110. The high-frequency signal is transmitted to the first shielding conductor 130 through the first capacitor Zc1. After the high-frequency signal completely flows through the first shielding conductor 130, it is transmitted to the second connecting conductor 220. The coupling receiving module 320 arranged on the second connecting conductor 220 receives the high-frequency signal, which is transmitted to the control module 410 for processing. The second current-carrying line 120, the second capacitor Zc2, the second shielding conductor 140 and the third connecting conductor 230 connected in sequence form another separate high-frequency detection path. The high-frequency coupling injection module 310 arranged on the side of the second current-carrying line 120 close to the input end of the power line injects a high-frequency signal into the second current-carrying line 120. The high-frequency signal is transmitted to the second shielding conductor 140 through the second capacitor Zc2. After the high-frequency signal completely flows through the second shielding conductor 140, it is transmitted to the third connecting conductor 230. The coupling receiving module 320 arranged on the third connecting conductor 230 receives the high-frequency signal, which is transmitted to the control module 410 for processing.

[0080] It can be understood that, Figure 4 The embodiment shown is different from the embodiment shown in Figure 3 The difference between the embodiment shown and the embodiment shown in lies in the different connection positions of the first capacitor Zc1 and the second capacitor Zc2, so that the directions of the high-frequency signals flowing through the first shielding conductor 130 and the second shielding conductor 140 are different.

[0081] Referring to Figures 1 to 4In another embodiment of the detection protection device, the response processing module 400 comprises a control module 410 and a triggering module 420 connected in sequence.

[0082] The control module 410 is configured to control the high-frequency coupling injection module 310 to inject a high-frequency signal into the high-frequency detection path, acquire the high-frequency signal received by the coupling receiving module 320, and output a trip triggering signal in the case that the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received.

[0083] The triggering module 420 is configured to, in response to receiving the trip triggering signal, disconnect the power connection between the input end and the output end of the power supply line by the switching module 500.

[0084] More specifically, when the first current-carrying line 110 leaks to the first shielding conductor 130 and / or the second current-carrying line 120 leaks to the second shielding conductor 140, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 falls within a preset range, which is 0°±10° or 180°±10°.

[0085] It should be noted that the phase of the high-frequency signal will change by about 180° after passing through the first capacitor Zc1, and the phase of the high-frequency signal will also change by about 180° after passing through the second capacitor Zc2.

[0086] Therefore, in the embodiments of Figure 1 and Figure 2 , in the case that no leakage occurs in the first current-carrying line 110 and the second current-carrying line 120, the phase difference between the high-frequency signal received by the coupling receiving module 320 and the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path should be small, and when the first current-carrying line 110 leaks to the first shielding conductor 130, which is equivalent to short-circuiting the first capacitor Zc1, the high-frequency signal on the first current-carrying line 110 can be transmitted from the leakage point to the first shielding conductor 130 without passing through the first capacitor Zc1, and at this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 180°. Similarly, when the second current-carrying line 120 leaks to the second shielding conductor 140, which is equivalent to short-circuiting the second capacitor Zc2, the high-frequency signal on the second shielding conductor 140 can be transmitted from the leakage point to the second current-carrying line 120 without passing through the second capacitor Zc2, and at this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 180°.

[0087] In the embodiments of Figure 3 and Figure 4In the embodiment, in the case that no leakage occurs in the first current-carrying line 110 and the second current-carrying line 120, the phase of the high-frequency signal received by the coupling receiving module 320 should be about 180° different from the phase of the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path. When the first current-carrying line 110 leaks to the first shielding conductor 130, it is equivalent to short-circuiting the first capacitor Zc1, and the high-frequency signal on the first current-carrying line 110 can be transmitted to the first shielding conductor 130 from the leakage without passing through the first capacitor Zc1. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 0°. Similarly, when the second current-carrying line 120 leaks to the second shielding conductor 140, it is equivalent to short-circuiting the second capacitor Zc2, and the high-frequency signal on the second current-carrying line 120 can be transmitted to the second shielding conductor 140 from the leakage without passing through the second capacitor Zc2. At this time, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module 310 into the high-frequency detection path and the high-frequency signal received by the coupling receiving module 320 should be about 0°.

[0088] In the detection protection device provided in some embodiments of the present application, when the first shielding conductor 130 and / or the second shielding conductor 140 is in an open circuit state, the coupling receiving module 320 does not receive the high-frequency signal.

[0089] In the embodiment, when the first shielding conductor 130 and / or the second shielding conductor 140 is in an open circuit state, the high-frequency signal injected by the high-frequency coupling injection module 310 cannot completely flow through the high-frequency detection path, and the coupling receiving module 320 cannot normally receive the high-frequency signal.

[0090] Referring to Figures 1 to 5 In the detection protection device provided in some embodiments of the present application, a direct-current power supply module 800 is further included, which is configured to supply power to at least one of the high-frequency coupling injection module 310, the coupling receiving module 320, the control module 410 and the triggering module 420.

[0091] In the embodiment, the direct-current power supply module 800 can convert the alternating current of the commercial power supply into low-voltage direct current VCC and provide the low-voltage direct current VCC to the high-frequency coupling injection module 310, the coupling receiving module 320, the control module 410 and the triggering module 420 and other modules in the detection protection device.

[0092] Referring to Figures 1 to 5 In the detection protection device provided in some embodiments of the present application, a test module 900 is further included, which includes a test switch TEST electrically connected to the output end of the direct-current power supply module 800 and the control module 410.

[0093] When the test switch TEST is not pressed, the control module 410 controls the high-frequency coupling injection module 310 to inject a first period of high-frequency signals into the high-frequency detection path;

[0094] When the test switch TEST is pressed, the control module 410 controls the high-frequency coupling injection module 310 to inject a second period of high-frequency signals into the high-frequency detection path.

[0095] In the embodiment, when the test switch TEST is pressed, the period of the high-frequency signals injected by the high-frequency coupling injection module 310 into the high-frequency detection path changes from the first period to the second period, so that the high-frequency signals have a significant difference from when the test switch TEST is not pressed; therefore, the control module 410 can determine whether the test switch TEST is pressed according to the period of the high-frequency signals received by the coupling receiving module 320.

[0096] Specifically, referring to Figure 5 , the test module 900 includes the test switch TEST, a first resistor R1 and a third capacitor C3, one end of the first resistor R1 is connected to the output end of the direct-current power supply module 800, the other end of the first resistor R1 is connected to one end of the test switch TEST, the other end of the test switch TEST is connected to the control module 410 and one end of the third capacitor C3, and the other end of the third capacitor C3 is grounded. By setting the first resistor R1 and the third capacitor C3 for filtering, the interference of the tiny pulse generated when the test switch TEST is pressed can be effectively filtered out, and the control module 410 can receive a stable test trigger signal.

[0097] Referring to Figure 5 , in another embodiment of the detection protection device provided by the application, the trigger module 420 includes a driving module 421, a silicon-controlled trigger module 422, a silicon-controlled silicon Q3, a trip coil Lx for generating an electromagnetic force to drive the switch module 500 to disconnect the power connection, a first diode D1 and a second diode D2; the driving module 421 includes an optical coupling U1, a third diode D3, a second resistor R2, a second capacitor C2 and a voltage stabilizing tube ZD1; the silicon-controlled trigger module 422 includes a twelfth resistor R12, a thirteenth resistor R13 and a first capacitor C1; specifically:

[0098] The output end of the control module 410 is connected to the input end of the optocoupler U1 so as to output the tripping trigger signal to the optocoupler U1, the first current-carrying wire 110 is connected to the anode of the third diode D3, the cathode of the third diode D3 is connected to one end of the second resistor R2, the other end of the second resistor R2 is connected to one end of the second capacitor C2, the anode of the voltage stabilizing tube ZD1 and one output end of the optocoupler U1, the other output end of the optocoupler U1 is connected to one end of the twelfth resistor R12, and 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 respectively;

[0099] The first current-carrying wire 110 is connected to one end of the tripping coil Lx, the other end of the tripping coil Lx is connected to the anode of the thyristor Q3 and the cathode of the second diode D2, the anode of the second diode D2, the cathode of the thyristor Q3, the other end of the first capacitor C1, the other end of the thirteenth resistor R13, the other end of the second capacitor C2 and the cathode of the voltage stabilizing tube ZD1 are all connected to the anode of the first diode D1, and the cathode of the first diode D1 is connected to the second current-carrying wire 120.

[0100] In the embodiment, after the input end of the optocoupler U1 receives the tripping trigger signal, the two output ends of the optocoupler U1 are turned on, and the current generated from the first current-carrying wire 110 to the twelfth resistor R12 in the thyristor triggering module 422 via the third diode D3, the second resistor R2 and the optocoupler U1, so as to charge the first capacitor C1, the potential of the control electrode of the thyristor Q3 is raised, and when the positive half cycle of the alternating power supply, that is, the level of the first current-carrying wire 110 is greater than the level of the second current-carrying wire 120, the thyristor Q3 is turned on, forming a strong current path of the first current-carrying wire 110-tripping coil Lx-thyristor Q3-first diode D1-second current-carrying wire 120; the tripping coil Lx generates a strong electromagnetic force, thereby driving the switching module 500 to disconnect the power connection between the input end and the output end of the power line.

[0101] With reference to Figure 5 In the detection protection device provided in some embodiments of the present application, the triggering module 420 further comprises a first pressure-sensitive resistor ZR1 connected in parallel with the thyristor Q3. It can be understood that the pressure-sensitive resistor is a resistor device with nonlinear voltage-current characteristics, which is mainly used for voltage clamping when the circuit bears overvoltage, and absorbs excess current to protect sensitive devices, so that the first pressure-sensitive resistor ZR1 connected in parallel with the thyristor Q3 can protect the thyristor Q3 from being damaged.

[0102] With reference to Figure 5 In the detection protection device provided in some embodiments of the present application, the indication module 600 connected in parallel with the thyristor Q3 further comprises the eleventh resistor R11, the tenth resistor R10 and the light-emitting diode LED1 connected in series.

[0103] Referring to Figure 5 In the detection protection device provided by some embodiments of the present application, a lightning protection module 700 is further included, and the lightning protection module 700 includes a second voltage-dependent resistor ZR2, and the two ends of the second voltage-dependent resistor ZR2 are connected with the first current-carrying line 110 and the second current-carrying line 120 respectively. It can be understood that the voltage-dependent resistor is a kind of resistor with nonlinear voltage-current characteristic, which is mainly used for voltage clamping when the circuit is subjected to overvoltage, and absorbs excess current to protect sensitive devices. Therefore, the second voltage-dependent resistor ZR2 is arranged before the first current-carrying line 110 and the second current-carrying line 120, so as to protect the subsequent components in the detection protection device from being damaged by lightning voltage.

[0104] The following will be described in combination with Figure 6 The action of the detection protection device provided by the embodiments of the present application will be introduced as follows:

[0105] Step S601: Start;

[0106] Step S602: Determine whether the test switch TEST is pressed; if not, jump to step S603; if yes, jump to step S604;

[0107] Step S603: The control module 410 controls the high-frequency coupling injection module 310 to inject a first period of high-frequency signal into the high-frequency detection path; and jump to step S605;

[0108] Step S604: The control module 410 controls the high-frequency coupling injection module 310 to inject a second period of high-frequency signal into the high-frequency detection path; and jump to step S605;

[0109] Step S605: The control module 410 acquires the high-frequency signal received by the coupling receiving module 320; if the phase difference between the received high-frequency signal and the injected high-frequency signal falls within a preset range 1, jump to step S606; if the phase difference between the received high-frequency signal and the injected high-frequency signal falls within a preset range 2, jump to step S607; if no high-frequency signal is received, jump to step S608;

[0110] Step S606: Determine that there is no fault; and jump to step S602;

[0111] Step S607: Determine that the power line has a leakage situation; and jump to step S609;

[0112] Step S608: Determine that the shielding conductor of the power line has an open circuit situation; and jump to step S609;

[0113] Step S609: The switch module 500 disconnects the power connection between the input end and the output end of the power line; and jump to step S610;

[0114] Step S610: End.

[0115] The power line detection protection device provided by the embodiment of the present application comprises a self-checking path module, a first current-carrying line 110, a second current-carrying line 120, a first shielding conductor 130 and a second shielding conductor 140. The first current-carrying line 110, the second current-carrying line 120, the first shielding conductor 130 and the second shielding conductor 140 form a high-frequency detection path. A high-frequency signal is injected into the high-frequency detection path. The high-frequency signal flows through the high-frequency detection path and is received by a coupling receiving module 320. The received high-frequency signal is transmitted to a response processing module 400. The response processing module 400 judges whether a leakage or open circuit condition occurs according to the phase difference between the received high-frequency signal and the injected high-frequency signal. The response processing module 400 disconnects the power connection between the input end and the output end of the power line, thereby ensuring the power supply safety of the power line. The power line detection protection device can effectively and reliably realize the leakage detection of the power line and the open circuit detection of the shielding conductor of the power line.

[0116] With reference to Figure 7 The second aspect embodiment of the present application provides an electrical connection device 1000 comprising the detection protection device of the first aspect embodiment, a housing 1010 and a power line. The power line is connected to the housing 1010. The response processing module 400 is arranged in the housing.

[0117] In addition, the third aspect embodiment of the present application provides a power-using device comprising a load device and the electrical connection device 1000 of the second aspect embodiment. The output end of the power line is connected to the load device.

[0118] The above describes the embodiments of the present application in detail with reference to the drawings. However, the present application is not limited to the above embodiments. Within the knowledge range of ordinary skilled persons in the art, various changes can be made without departing from the purpose of the present application.

Claims

1. A detection protection device for a power cord, characterized by, The power line comprises a first current-carrying line, a second current-carrying line, a first shielding conductor covering the first current-carrying line, and a second shielding conductor covering the second current-carrying line, and the detection protection device comprises: a self-checking path module electrically connected to the first current-carrying line, the first shielding conductor, the second current-carrying line, and the second shielding conductor to form a high-frequency detection path; the self-checking path module comprises a first capacitor and a second capacitor, the first capacitor is electrically connected to the first current-carrying line and the first shielding conductor, and the second capacitor is electrically connected to the second current-carrying line and the second shielding conductor; a high-frequency coupling injection module for injecting a high-frequency signal into the high-frequency detection path; a coupling receiving module for receiving a high-frequency signal from the high-frequency detection path; a response processing module electrically connected to the high-frequency coupling injection module and the coupling receiving module, for disconnecting the power connection between the input end and the output end of the power line according to the high-frequency signal 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 shielding conductor comprises a first end close to the input end of the power line and a second end close to the output end of the power line; and the second shielding conductor comprises a fourth end close to the input end of the power line and a fifth end close to the output end of the power line.

3. The detection protection device according to claim 2, characterized in that, The self-checking path module further comprises a first connecting conductor electrically connected to the first shielding conductor and the second shielding conductor.

4. The detection protection device according to claim 3, characterized in that The self-checking path module comprises one of the following cases: Case one: the first capacitor is connected to the first current-carrying line and the second end, the second capacitor is connected to the second current-carrying line and the fifth end, and the first connecting conductor is connected to the first end and the fourth end; Case two: the first capacitor is connected to the first current-carrying line and the first end, the second capacitor is connected to the second current-carrying line and the fourth end, and the first connecting conductor is connected to the second end and the fifth end.

5. The detection protection device according to claim 4, characterized in that The high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line, and the coupling receiving module is arranged on one side of the second current-carrying line close to the input end of the power line.

6. The detection protection device according to claim 2, characterized by The first capacitor is connected to the first current-carrying line and the second end; and the second capacitor is connected to the second current-carrying line and the fifth end. The high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line and one side of the second current-carrying line close to the input end of the power line; The coupling receiving module is arranged at a position close to the first end of the first shielding conductor and a position close to the fourth end of the second shielding conductor.

7. The detection protection apparatus according to claim 2, characterized by The first capacitor is connected to the first current-carrying line and the first end; and the second capacitor is connected to the second current-carrying line and the fourth end. The self-checking path module further comprises a second connecting conductor connected to the second end and a third connecting conductor connected to the fifth end. The high-frequency coupling injection module is arranged on one side of the first current-carrying line close to the input end of the power line and one side of the second current-carrying line close to the input end of the power line. The coupling receiving module is arranged on the second connecting conductor and the third connecting conductor.

8. The detection protection apparatus according to claim 1, characterized by The response processing module comprises a control module and a triggering module connected in sequence. The control module is configured to control the high-frequency coupling injection module to inject a high-frequency signal into the high-frequency detection path, acquire the high-frequency signal received by the coupling receiving module, and output a trip triggering signal in the case that the phase difference between the injected high-frequency signal and the received high-frequency signal falls within a preset range or no high-frequency signal is received. The triggering module is configured to, in response to receiving the trip triggering signal, disconnect the power connection between the input end and the output end of the power line through a switching module.

9. The detection protection device according to claim 8, characterized in that When the first current-carrying line leaks to the first shielding conductor and / or the second current-carrying line leaks to the second shielding conductor, the phase difference between the high-frequency signal injected by the high-frequency coupling injection module into the high-frequency detection path and the high-frequency signal received by the coupling receiving module falls within a preset range, and the preset range is 0°±10° or 180°±10°.

10. The detection protection device according to claim 8, characterized in that, When the first shielding conductor and / or the second shielding conductor is in an open circuit condition, the coupling receiving module does not receive a high-frequency signal.

11. The detection protection device according to claim 8, characterized by The DC power supply module is further included for supplying power to at least one of the high-frequency coupling injection module, the coupling receiving module, the control module and the triggering module.

12. The detection protection device according to claim 11, characterized in that, The test module is further included and comprises a test switch electrically connected to the output end of the DC power supply module and the control module. When the test switch is not pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a first period into the high-frequency detection path. When the test switch is pressed, the control module controls the high-frequency coupling injection module to inject a high-frequency signal of a second period into the high-frequency detection path.

13. An electrical connection device, characterized by The detection protection device, the housing and the power line of any one of claims 1 to 12 are included, the power line is connected to the housing, and the response processing module is arranged in the housing.

14. An electrical device, characterized by The load device and the electrical connection device of claim 13 are included, and the output end of the power line is connected to the load device.

Images