CN217882816U - Power line electric leakage detection protection device, electric connection equipment and electrical appliance - Google Patents

Abstract

The utility model provides a power cord electric leakage detection protection device, include: the switch module controls the power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line covering the first current-carrying line, collects a first leakage current signal on the first current-carrying line, a second leakage detection line covering the second current-carrying line and collects a second leakage current signal on the second current-carrying line; the detection monitoring module is coupled with the electric leakage detection module, the first current-carrying wire and the second current-carrying wire and used for generating an open-circuit detection signal to detect whether the first electric leakage detection wire and the second electric leakage detection wire have open-circuit faults or not; the test module comprises at least one test switch coupled to the first leakage detection line or the second leakage detection line, the test switch is a normally closed switch, and when the test switch is disconnected, the switch module disconnects the power connection between the input end and the output end. The device detects two current-carrying lines and detection line, and circuit structure is simple, with low costs and the security is high.

Description

Power line leakage detection protection device, electric connection equipment and electrical appliance

Technical Field

The utility model relates to an electric field especially relates to a power cord leakage detection protection device, electrical connection equipment and use electrical apparatus.

Background

The power line leakage detection protector (LCDI device) is a safety protector for electric fire, and its main structure is power line with plug, and its main function is to detect leakage current between live wire and zero wire of power line between power supply plug and load electric appliance (for example air conditioner and dehumidifier) and wire protective layer (shield), and cut off power supply of electric appliance to prevent fire so as to provide safety protection. Therefore, the LCDI device can prevent an arc fault fire caused by power line damage and insulation strength reduction due to live wire (L wire), neutral wire (N wire), ground wire aging, abrasion, extrusion, or animal biting in the power line.

When the leakage detection line (shielding line) is open-circuit and the open circuit of the existing LCDI device does not have the protection function, the product can still work normally. There are fire hazards or other electrical safety hazards.

Therefore, a power line leakage detection protection device capable of detecting a leakage detection line is needed.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a power cord electric leakage detection protection device on the one hand, it includes:

a switch module configured to control a power connection between an input and an output of a power line;

a leakage detection module including a first leakage detection line that wraps a first current carrying line in the power supply line and is configured to collect a first leakage current signal of the first current carrying line, and a second leakage detection line that wraps a second current carrying line in the power supply line and is configured to collect a second leakage current signal of the second current carrying line;

a detection monitoring module coupled to the leakage detection module, the first current carrying line and the second current carrying line for generating an open circuit detection signal to detect whether an open circuit fault exists in the first leakage detection line and the second leakage detection line; and

a test module including at least one test switch coupled to the first or second leakage detection line, wherein the test switch is a normally closed switch, and when the test switch is open, the switch module disconnects the power connection between the input terminal and the output terminal

In one embodiment, the power line leakage detection protection device further includes: a driving module coupled to the switching module, the leakage detection module and the detection monitoring module and configured to drive the switching module to disconnect the power connection when the first leakage detection line and/or the second leakage detection line detects a leakage current signal.

In one embodiment, the driving module is further configured to drive the switching module to disconnect the power connection when an open-circuit fault occurs in the first leakage detection line and/or the second leakage detection line.

In one embodiment, the detection monitoring module includes at least one resistor coupled to the leakage detection module, the first current carrying line, and the second current carrying line.

In one embodiment, the drive module comprises:

a solenoid configured to generate an electromagnetic force for driving the switching module; and

at least one semiconductor element coupled to the solenoid and the detection monitoring module, wherein the semiconductor element causes the solenoid to generate the electromagnetic force to drive the switching module to disconnect the power connection under the action of a leakage fault signal and/or an open fault signal.

In one embodiment, the signal processing module comprises:

a comparison unit configured to generate a threshold signal;

wherein the comparing unit prevents the semiconductor element from controlling the solenoid to drive the switching module to disconnect the power connection when the signal output by the detection monitoring module is lower than the threshold signal;

when at least one of the first leakage current signal, the second leakage current signal, and the open-circuit detection signal is greater than the threshold signal, the comparing unit generates the leakage fault signal or the open-circuit fault signal.

In one embodiment, the comparison unit is selected from one of the following: a voltage regulator tube, a trigger tube, a comparator, a TVS tube and an optical coupler.

In one embodiment, the semiconductor element is selected from one of the following: silicon controlled, bipolar transistor, field effect transistor and photoelectric coupling element.

In one embodiment, the driving module further comprises:

a half-bridge rectification unit coupled to the solenoid and the semiconductor element, configured to provide a rectified drive signal to the solenoid; or

A full-bridge rectification unit coupled to the solenoid and the semiconductor element, configured to provide a rectified driving signal to the solenoid.

In view of the above, the second aspect of the present invention provides an electrical connection device, comprising: a housing; and a power supply line leakage detection protection device according to any one of the embodiments of the first aspect, the power supply line leakage detection protection device being housed in the housing.

To the above problem, the third aspect of the present invention provides an electrical appliance, which includes: a load device; and an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises the power line leakage detection protection apparatus according to any one of the embodiments of the first aspect.

The utility model discloses in, two electric leakage detection lines are set up respectively into a cladding current-carrying line and form the electric leakage detection return circuit with detection monitoring module, test module, drive module and switch module, consequently, can detect the electric leakage condition on two current-carrying lines or the condition of opening circuit of two electric leakage detection lines alone. Further, the utility model provides a power cord electric leakage detection protection device can effectively reduce or eliminate under the condition that does not take place electric leakage trouble for the semiconductor element's of dropout trigger utmost point bias voltage makes the normal during operation of LCDI more reliable stable. Furthermore, the utility model provides a power cord electric leakage detection protection device circuit structure is simple, with low costs and the security is high.

Drawings

Embodiments are shown and described with reference to the drawings. These drawings are provided to illustrate the basic principles and thus only show the aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals designate similar features.

Fig. 1 shows an architecture diagram of a power line leakage detection protection device according to an embodiment of the present invention;

fig. 2 shows a schematic diagram of a first embodiment of a power line leakage detection protection device according to the present invention;

fig. 3 shows a schematic diagram of a second embodiment of a power line leakage detection protection device according to the present invention;

fig. 4 shows a schematic diagram of a third embodiment of a power line leakage detection protection device according to the present invention; and

fig. 5 shows a schematic diagram of a fourth embodiment of a power line leakage detection protection device according to the present invention.

Detailed Description

In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof. The accompanying drawings illustrate, by way of example, specific embodiments in which the invention may be practiced. The example embodiments are not intended to be exhaustive of all embodiments according to the invention. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.

Before describing embodiments of the present invention, some terms referred to in the present invention will be explained first to better understand the present invention.

As used herein, the terms "connected," "coupled," or "coupled," and similar terms are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The use of the terms a, an, etc. do not denote a limitation of quantity, but rather denote the presence of at least one.

As used herein, the terms "include," "include," and similar terms are to be construed as open-ended terms, i.e., "including/including but not limited to," meaning that additional content can be included as well. The term "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment," and so on.

The utility model discloses mainly pay close attention to following technical problem: how to improve the working stability of the power line leakage detection protection device.

In order to solve the above problem, according to the present general inventive concept, there is provided a power line leakage detection protection device, including: the switch module controls the power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line covering the first current-carrying line, and is used for collecting a first leakage current signal on the first current-carrying line, and a second leakage detection line covering the second current-carrying line, and is used for collecting a second leakage current signal on the second current-carrying line; the detection monitoring module is coupled with the electric leakage detection module, the first current-carrying wire and the second current-carrying wire and used for generating an open-circuit detection signal to detect whether the first electric leakage detection wire and the second electric leakage detection wire have open-circuit faults or not; the test module comprises at least one test switch, the test switch is coupled to the first leakage detection line or the second leakage detection line, the test switch is a normally closed switch, and when the test switch is disconnected, the switch module disconnects the power connection between the input end and the output end.

Fig. 1 shows an architecture diagram of a power line leakage detection protection device according to an embodiment of the present invention. As shown in fig. 1, the power line leakage detection protection device 100 includes a switch module 103, a leakage detection module 104, a test module 105, a detection monitoring module 106, and a driving module 107. The switch module 103 controls the power connection between the input 101 and the output 102 of the power line. The leakage detection module 104 includes a first leakage detection line and a second leakage detection line. The first leakage detection line wraps a first current-carrying line in the power line and collects a first leakage current signal on the first current-carrying line, and the second leakage detection line wraps a second current-carrying line in the power line and collects a second leakage current signal on the second current-carrying line. The detection monitoring module 106 is coupled to the leakage detection module 104, the first current-carrying line and the second current-carrying line, and is configured to generate an open-circuit detection signal to detect whether an open-circuit fault exists in the first leakage detection line and the second leakage detection line. The test module 105 is coupled between the leakage detection module 104 and the detection monitoring module 106, and controls the switch module to disconnect the power connection between the input terminal and the output terminal. The driving module 107 is coupled to the switch module 103, the leakage detection module 104 and the detection monitoring module 106, and is used for driving the switch module 10 to disconnect power when the first leakage detection line and/or the second leakage detection line detects a leakage current signal. In the power line leakage detection protection device 100, two leakage detection lines respectively cover one current-carrying line and form a leakage detection loop with the test module, the detection monitoring module and the driving module. Therefore, the device 100 can detect the leakage of the two current-carrying lines or the disconnection of the two leakage detection lines independently.

In some embodiments, the driving module 107 is further configured to drive the switch module 103 to disconnect the power connection when the first leakage detection line and/or the second leakage detection line has an open circuit fault. By providing the driving module 107, on the one hand, the power connection can be disconnected when the leakage current signal is detected; on the other hand, whether the first leakage detection line and the second leakage detection line have faults (such as open circuit or broken circuit) or not can be detected, and the power connection is disconnected when the faults occur; thereby improving the reliability of the power line leakage detection protection device 100.

In some embodiments, the detection monitoring module 106 includes at least one resistor coupled to the leakage detection module 104, the first current carrying line, and the second current carrying line. The detection monitoring module 106 is used for regulating and controlling the control signal output to the driving unit to prevent the driving module 107 from being tripped mistakenly.

In some embodiments, the drive module 107 includes a solenoid and at least one semiconductor element. The solenoid generates an electromagnetic force for driving the switch module 103, and the semiconductor element is coupled to the solenoid and detection monitoring module 106, which causes the solenoid to generate an electromagnetic force to drive the switch module 103 to disconnect the power connection under the action of the leakage fault signal and/or the open fault signal. The semiconductor element may be a thyristor, a bipolar transistor, a field effect transistor, or a photocoupler.

In some embodiments, the driving module 107 further comprises: a comparison unit configured to generate a threshold signal; when the signal output by the detection monitoring module 106 is lower than the threshold signal, the comparison unit prevents the semiconductor element control solenoid from driving the switch module to disconnect the power connection; when at least one of the first leakage current signal, the second leakage current signal and the open-circuit detection signal is greater than the threshold signal, the comparison unit generates a leakage fault signal or an open-circuit fault signal. The comparison unit is selected from one of the following items: a voltage regulator tube, a trigger tube, a comparator, a TVS tube and an optical coupler.

In some embodiments, the driving module 107 further comprises a half-bridge rectifying unit or a full-bridge rectifying unit. A half-bridge rectifying unit coupled to the solenoid and the semiconductor element for providing a rectified driving signal to the solenoid; the full-bridge rectifying unit is coupled to the solenoid and the semiconductor element, and is used for providing a rectified driving signal to the solenoid.

Example 1

Fig. 2 shows a schematic diagram of a first embodiment of a power line leakage detection protection device according to the present invention. In this example, the power line leakage detection protection device includes a switch module 103, a leakage detection module 104, a test module 105, a detection monitoring module 106, and a driving module 107. As shown in fig. 2, the switch module 103 comprises a RESET switch RESET for controlling the power connection between the input LINE and the output LOAD of the power supply LINE. The power supply line includes a first current-carrying line 11 (HOT, live), a second current-carrying line 12 (WHITE, neutral), and a third current-carrying line 13 (GND, ground). The leakage detection module 104 includes at least a first leakage detection line 141 and a second leakage detection line 142. The first leakage detection line 141 covers the first current-carrying line 11, and the second leakage detection line 142 covers the second current-carrying line 12. In this embodiment, the first end of each of the first and second leakage detecting lines 141 and 142 is an end distant from the LOAD, and is located on the left side in fig. 2; the second end is the end near the LOAD, which is located on the right side in fig. 2.

As shown in fig. 2, the first and second leakage detecting lines 141 and 142 are connected in series. A first end of the second leakage detecting line 142 is connected to one end of a resistor R5 of the detection monitoring module 106 to form a connection point a, and the other end of the resistor R5 is connected to the first current-carrying line 11. A first end of the first leakage detection line 141 is connected to one end of a resistor R6 of the detection monitoring module 106 via the TEST module 105 (e.g., a TEST switch TEST), and the other end of the resistor R6 is connected to a cathode of the thyristor SCR of the driving module 107, one end of a capacitor C2, and anodes of diodes D1 and D2. In a driving module 107, one end of a voltage stabilizing tube ZD1 is connected to a connection point A through a resistor R2, and the other end of the voltage stabilizing tube ZD1 is connected to a control electrode of a silicon controlled rectifier SCR; and two ends of the capacitor C2 are respectively connected to the control electrode and the cathode of the silicon controlled rectifier SCR. The cathode of the thyristor SCR is also connected to the anodes of diodes D1 and D2, the anode of which is connected to the cathode of diode D2 and to one end of solenoid SOL. The other end of solenoid SOL is connected to second current carrying line 12 and RESET switch RESET. The cathode of diode D1 is connected to first current carrying line 11 and RESET switch RESET.

When the first and second leakage detection lines 141 and 142 are both working normally (not open), the current of the first current-carrying line 11 flows through the loop of the resistor R5-the second leakage detection line 142-the first leakage detection line 141-the TEST switch TEST-the resistor R6-the capacitor D2-the solenoid SOL to the second current-carrying line 12. The resistance values of the resistors R5 and R6 are set, so that the voltage of the point A is lower than the threshold voltage of the voltage stabilizing tube ZD1, the voltage of the control electrode of the SCR is limited to an extremely low level, and the SCR is prevented from triggering to cause the false tripping of the power line leakage detection protection device. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first current-carrying wire 11 generates a leakage current signal (a first leakage current signal) or the second current-carrying wire 12 generates a leakage current signal (a second leakage current signal), the potential at the point a rises, the current triggers the conduction of the silicon controlled rectifier SCR through the first current-carrying wire 11, the first leakage detection wire 141, the second leakage detection wire 142, the resistor R2 and the voltage regulator tube ZD1, a larger current is generated on the solenoid SOL, a sufficiently large magnetic field is formed, the RESET switch RESET of the driving switch module 103 is tripped, and then the power connection between the input end LINE and the output end LOAD is cut off. Therefore, the device can independently detect the leakage current signals on the first current-carrying line 11 and the second current-carrying line 12.

When the first leakage detection LINE 141 or the second leakage detection LINE 142 is open-circuited or broken, the resistor R6 loses the voltage dividing function, the potential at the point a rises, the current triggers the conduction of the silicon controlled rectifier SCR through the first current-carrying LINE 11, the resistor R5, the resistor R2 and the voltage regulator tube ZD1, the RESET switch RESET of the solenoid SOL driving switch module 103 is tripped, and then the power connection between the input end LINE and the output end LOAD is cut off. Therefore, the apparatus can independently detect whether the first and second leakage detecting lines 141 and 142 fail.

Other modules of the power line earth leakage detection protection device may also be fault tested by the test module 105. In this embodiment, when all the components of the device are normally operated and no leakage occurs between the first leakage detection line 141 and the first current-carrying line 11, and between the second leakage detection line 142 and the second current-carrying line 12, the zener diode ZD1 cannot trigger the SCR to conduct, and the product is normally operated.

When the TEST switch TEST is pressed down to be disconnected, the resistor R6 loses a voltage dividing function, the potential of the point A rises, the current triggers the silicon controlled rectifier SCR to be conducted through the first current-carrying wire 11, the resistor R5, the resistor R2 and the voltage stabilizing tube ZD1, the solenoid SOL drives the RESET switch RESET of the switch module 103 to be tripped, and then the power connection between the input end LINE and the output end LOAD is cut off. Therefore, the user can detect whether the protection device is intact by operating the TEST switch TEST.

Example two

Fig. 3 shows a schematic diagram of a second example of a power line leakage detection protection device according to the present invention. Compared to the embodiment of fig. 2, the difference is mainly that one end of the resistor R3 of the detection monitoring module 106 is connected to the first current-carrying line 11 by connecting the full-bridge rectification unit DB, and the other end of the resistor R3 is connected to the first end of the first leakage detection line 141 by connecting the TEST module 105 (e.g., the TEST switch TEST); a first end of a second leakage detection line 142 connected in series with the first leakage detection line 141 is connected to one end of a resistor R2 of the detection monitoring module 106, the other end of the resistor R2 is connected to a base of a transistor Q1 of the driving module 107, and a collector of the transistor Q1 is connected to a control electrode of the silicon controlled rectifier SCR and one end of the resistor R1, respectively, to form a connection point a; the other end of the resistor R1 is respectively connected to the full-bridge rectification unit DB, the anode of the silicon controlled rectifier SCR and one end of the resistor R3; the cathode of the thyristor SCR is connected to the solenoid SOL by connecting the full-bridge rectification unit DB.

When the first and second leakage detecting lines 141 and 142 are both working normally (not open), the current of the first current-carrying line 11 flows through the full-bridge rectifying unit DB-resistor R3-TEST switch TEST-the first leakage detecting line 141-the second leakage detecting line 142-resistor R2-triode Q1-full-bridge rectifying unit DB-solenoid SOL to the second current-carrying line 12. When the current flows through the triode Q1, the triode Q1 is conducted, so that the voltage of the point A of the control electrode of the silicon controlled rectifier SCR is limited to an extremely low level, and the silicon controlled rectifier SCR is guaranteed not to trigger the error tripping of the power line leakage detection protection device. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first current-carrying LINE 11 generates a leakage current signal (a first leakage current signal) and the second current-carrying LINE 12 is at the upper half-cycle, the current flows through the second current-carrying LINE 12 and flows through the full-bridge rectification unit DB-resistor R3-TEST switch TEST-first leakage detection LINE 141-first current-carrying LINE 11, by adjusting the resistances of the resistor R3 and the resistor R2, when the first leakage current signal exceeds a set threshold, the current flowing through the resistor R2 cannot drive the transistor Q1, the transistor Q1 is in a cut-off state, the potential at the point a is increased, and the current flows through the second current-carrying LINE 12-full-bridge rectification unit DB-resistor R1 to trigger the thyristor SCR to drive the solenoid SOL, so that the switch module 103 disconnects the power connection between the input terminal LINE and the output terminal LOAD.

Similarly, when the second current-carrying LINE 12 generates the leakage current signal (the second leakage current signal) and the first current-carrying LINE 11 is at the upper half-cycle, the current flows through the full-bridge rectification unit DB-resistor R3-the TEST switch TEST-the first leakage detection LINE 141-the second leakage detection LINE 142-the second current-carrying LINE 12 via the first current-carrying LINE 11, so that when the second leakage current signal exceeds the set threshold value, the current flowing through the resistor R2 cannot drive the transistor Q1, the transistor Q1 is in the cut-off state, the potential at the point a is raised, and the current triggers the SCR to drive the solenoid SOL via the first current-carrying LINE 11-the full-bridge rectification unit DB-resistor R1, so that the switch module 103 disconnects the power connection between the input terminal LINE and the output terminal LOAD.

Thus, the apparatus can independently detect whether the first and second leakage detecting lines 141 and 142 fail.

When the first leakage detection LINE 141 or the second leakage detection LINE 142 is open-circuited or broken, no current drives the transistor Q1 through the resistor R2, so that the transistor Q1 is in a cut-off state, the potential at the point a rises, and the current triggers the silicon controlled rectifier SCR through the current-carrying LINE-full bridge rectification unit DB-resistor R1 to drive the solenoid SOL, so that the switch module 103 disconnects the power connection between the input terminal LINE and the output terminal LOAD.

Other modules of the power line earth leakage detection protection device may also be fault tested by the test module 105. In this embodiment, when all components of the apparatus are working normally and no leakage occurs between the first leakage detection line 141 and the first current-carrying line 11, and between the second leakage detection line 142 and the second current-carrying line 12, the transistor Q1 can not trigger the SCR to conduct when working normally, and the product works normally.

When the TEST switch TEST is pressed down to disconnect the TEST switch TEST, no current drives the triode Q1 through the resistor R2, so that the triode Q1 is in a cut-off state, the potential at the point a rises, and the current triggers the silicon controlled rectifier SCR through the current-carrying LINE-full bridge rectification unit DB-resistor R1 to drive the solenoid SOL, so that the switch module 103 disconnects the power connection between the input end LINE and the output end LOAD. Therefore, the user can detect whether the protection device is intact by operating the TEST switch TEST.

Example three

Fig. 4 shows a schematic diagram of a third example of a power line leakage detection protection device according to the present invention. In the embodiment of fig. 4, the leakage detecting module 104 includes a first leakage detecting line 141, a second leakage detecting line 142, and a connecting line 21. The first leakage detection line 141 covers the first current-carrying line 11, and the second leakage detection line 142 covers the second current-carrying line 12. Similar to the embodiment of fig. 2, in this embodiment, the first end of each of the first leakage detecting line 141, the second leakage detecting line 142, and the connection line 21 is an end far from the LOAD, and is located on the left side in fig. 4; the second end is the end near the LOAD, which is located on the right side in fig. 4.

As shown in fig. 4, the second ends of the first and second leakage detection lines 141 and 142 are connected to the second end of the connection line 21. A first end of the first leakage detection line 141 is connected to one end of the resistor R5 of the detection and monitoring module 106, a first end of the connection line 21 is connected to one end of the TEST module 105 (e.g., TEST switch TEST), a first end of the second leakage detection line 142 is connected to one end of the resistor R4 of the detection and monitoring module 106, and the other end of the TEST module 105 is connected to one end of the resistor R1 of the detection and monitoring module 106 and forms a connection point a. The other end of the resistor R5 and the other end of the resistor R4 are connected to one end of a resistor R3, one end of a capacitor C1, a cathode of the thyristor SCR, and anodes of diodes D2 and D1 in the driving module 107. One end of a resistor R2 of the driving module 107 is connected to the connection point A, the other end of the resistor R2 is connected with the other end of the resistor R3 and a control electrode of the silicon controlled rectifier SCR, and a capacitor C1 is connected between the control electrode and a cathode of the silicon controlled rectifier SCR in parallel; the anode of the silicon controlled rectifier SCR and the cathode of the diode D1 are both connected with one end of the solenoid SOL.

When the first and second leakage detection lines 141 and 142 are both working normally (not open), the current of the second current-carrying line 12 flows through the loop of the solenoid SOL-resistor R1-TEST switch TEST-first leakage detection line 141-resistor R5-diode D2-solenoid SOL-first current-carrying line 11; similarly, the current of the second current-carrying line 12 flows through the loop of the solenoid SOL-resistor R1-TEST switch TEST-second leakage detection line 142-resistor R4-diode D2-solenoid SOL-first current-carrying line 11. The voltage of the point A is reduced by adjusting the resistance values of the resistors R1, R4 and R5, and the voltage of the control electrode of the silicon controlled rectifier SCR is at an extremely low level after the voltage is divided by the resistors R2 and R3, so that the silicon controlled rectifier SCR is ensured not to be triggered to cause the tripping of the device. At this time, the switch module 103 is in a closed state, and the device is normally powered on for use.

When the first current-carrying LINE 11 generates a leakage current signal (first leakage current signal) or the second current-carrying LINE 12 generates a leakage current signal (second leakage current signal), the potential at point a rises, and when the leakage current signal exceeds a set threshold, the current triggers the SCR driving solenoid SOL through the current-carrying LINE-resistor R2 to disconnect the power connection between the input LINE and the output LOAD by the switch module 103.

When at least one of the leakage detection LINEs is open-circuited or open-circuited, the potential at the point a rises, and the current flows through the second current-carrying LINE 12, the solenoid SOL, the resistor R1 and the resistor R2 to trigger the SCR to drive the solenoid SOL, so that the switch module 103 disconnects the power connection between the input LINE and the output LOAD.

Other modules of the power line earth leakage detection protection device may also be fault tested by the test module 105. In this embodiment, when all the components of the device are normally operated and no leakage occurs between the first leakage detection line 141 and the first current-carrying line 11, and between the second leakage detection line 142 and the second current-carrying line 12, the resistor R2 cannot trigger the SCR to be turned on, and the product is normally operated.

When the TEST switch TEST is pressed down to open the TEST switch TEST, the potential at point a rises and the current flows through the second current-carrying LINE 12-the solenoid SOL-resistor R1-the resistor R2 to trigger the SCR driving solenoid SOL to open the power connection between the input LINE and the output LOAD of the switch module 103. Therefore, the user can detect whether the protection device is intact by operating the TEST switch TEST.

Example four

Fig. 5 shows a schematic diagram of a fourth example of a power line leakage detection protection device according to the present invention. In the embodiment of fig. 5, the leakage detecting module 104 includes a first leakage detecting line 141, a second leakage detecting line 142, and connection lines 21 and 22. The first leakage detection line 141 covers the first current-carrying line 11, and the second leakage detection line 142 covers the second current-carrying line 12. In this embodiment, the first end of each of the first leakage detecting line 141, the second leakage detecting line 142, and the connection lines 21 and 22 is an end distant from the LOAD, and is located on the left side in fig. 5; the second end is the end near the LOAD, which is located on the right side in fig. 5.

A second end of the first leakage detection line 141 is connected to a second end of the connection line 21, and a second end of the second leakage detection line 142 is connected to a second end of the connection line 22. A first end of the first leakage detection line 141 is connected to one end of the resistor R5 of the detection monitoring module 106, forming a connection point a. A first end of the second leakage detecting line 142 is connected to one end of the resistor R51 of the detection monitoring module 106, forming a connection point B. The first end of the connection line 21 is sequentially connected to the TEST switch TEST1 of the TEST module 105 and the resistor R6 of the detection monitoring module 106, and the first end of the connection line 22 is sequentially connected to the TEST switch TEST2 of the TEST module 105 and the resistor R61 of the detection monitoring module 106.

The resistors R6 and R61 of the detection monitoring module 106 are connected to the capacitors C1, C2, C11, and C22 of the driving module 107, the cathode of the thyristor SCR1, the cathode of the thyristor SCR11, and the anodes of the diodes D2 and D1; a resistor R2 of the driving module 107 is arranged between the connection point A and the cathode of the voltage regulator tube ZD1, and a capacitor C1 is arranged between the cathode of the voltage regulator tube ZD1 and the resistor R6; the anode of the voltage-regulator tube ZD1 is coupled to the control electrode of the controlled silicon SCR1, the capacitor C2 is connected between the control electrode and the cathode of the controlled silicon SCR1 in parallel, and the anode of the controlled silicon SCR1 is connected to the solenoid SOL. A resistor R21 of the driving module 107 is arranged between the connection point B and the cathode of the voltage regulator tube ZD11, and a capacitor C11 is arranged between the cathode of the voltage regulator tube ZD1 and the resistor R6; the anode of the voltage-regulator tube ZD11 is coupled to the control electrode of the controlled silicon SCR11, the capacitor C21 is connected between the control electrode and the cathode of the controlled silicon SCR11 in parallel, and the anode of the controlled silicon SCR11 is connected to the solenoid SOL.

When the first and second leakage detecting lines 141 and 142 and the connecting lines 21 and 22 are all working normally (not open or broken), the current of the first current-carrying line 11 flows through the loop of R5-the first leakage detecting line 141-the connecting line 21-the TEST switch TEST 1-the resistor R6-the diode D2-the solenoid SOL to the second current-carrying line 12. By setting the resistance values of the resistors R5 and R6, the point A is limited to a lower potential which is lower than the threshold voltage of ZD1, so that the voltage of the control electrode of the SCR1 is limited to an extremely low level, and the SCR1 is ensured not to trigger to cause the false tripping of the device. Similarly, the current of the second current-carrying line 12 flows through the loop of R51-the second leakage detection line 142-the connection line 22-the TEST switch TEST 2-the resistor R61-the diode D2-the solenoid SOL to the first current-carrying line 11. By setting the resistance values of the resistors R51 and R61, the point B is limited to a lower potential, which is lower than the threshold voltage of ZD11, so as to limit the voltage of the trigger electrode of the SCR11 to an extremely low level, and ensure that the SCR11 does not trigger to cause the false tripping of the device. At this time, the switch module 103 is in a closed state, and the product is normally powered on for use.

When the first current-carrying wire 11 generates leakage current, the potential of the point a rises, the thyristor SCR1 is triggered through the first current-carrying wire 11, the first leakage detection LINE 141, the resistor R2 and the voltage regulator tube ZD1, and the solenoid SOL is driven to disconnect the power connection between the input end LINE and the output end LOAD of the switch module 103. Similarly, when the second current-carrying wire 12 generates leakage current, the potential of the point B rises, the thyristor SCR11 is triggered through the second current-carrying wire 12, the second leakage detection wire 142, the resistor R21 and the voltage regulator tube ZD11, and the solenoid SOL is driven to disconnect the power connection between the input end LINE and the output end LOAD of the switch module.

When the first leakage detection LINE 141 is open-circuited or the TEST switch TEST1 is operated to be disconnected, the voltage dividing function of the R6 is lost, the potential of the point A rises, the silicon controlled rectifier SCR1 is triggered through the first current-carrying LINE 11, the resistor R5, the resistor R2 and the voltage regulator tube ZD1, and the solenoid SOL is driven to enable the switch module 103 to cut off the power connection between the input end LINE and the output end LOAD.

Similarly, when the second leakage detection LINE 142 is open-circuited or the TEST switch TEST2 is operated to be disconnected, the resistor R61 loses the voltage dividing function, the potential at the point B rises, the thyristor SCR11 is triggered through the second current-carrying LINE 12, the resistor R51, the resistor R21 and the voltage regulator tube ZD11, and the solenoid SOL is driven to enable the switch module 103 to cut off the power connection between the input end LINE and the output end LOAD.

A second aspect of the present invention provides an electrical connection device, including: a housing; and a power supply line leakage detection protection device according to any one of the above embodiments, the power supply line leakage detection protection device being accommodated in the housing.

The third aspect of the present invention provides an electrical appliance, including: a load device; and an electrical connection device coupled between the power supply line and the load device for supplying power to the load device, the electrical connection device including the power line leakage detection protection apparatus in any of the above embodiments.

Thus, while the present invention has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the invention, it will be apparent to those of ordinary skill in the art that changes, additions or deletions may be made to the disclosed embodiments without departing from the spirit and scope of the invention.

Claims (11)

1. A power line leakage detection protection device, comprising:

a switch module configured to control a power connection between an input and an output of a power line;

a leakage detection module comprising a first leakage detection line wrapping a first current-carrying line of the power lines and configured to collect a first leakage current signal of the first current-carrying line, and a second leakage detection line wrapping a second current-carrying line of the power lines and configured to collect a second leakage current signal of the second current-carrying line;

a detection monitoring module coupled to the leakage detection module, the first current carrying line and the second current carrying line for generating an open circuit detection signal to detect whether an open circuit fault exists in the first leakage detection line and the second leakage detection line; and

a test module including at least one test switch coupled to the first or second leakage detection line, wherein the test switch is a normally closed switch, and when the test switch is open, the switch module disconnects the power connection between the input terminal and the output terminal.

2. The power line leakage detection protection device of claim 1, further comprising:

a driving module coupled to the switching module, the leakage detection module and the detection monitoring module and configured to drive the switching module to disconnect the power connection when the first leakage detection line and/or the second leakage detection line detects a leakage current signal.

3. The power line leakage detection protection device of claim 2, wherein the driving module is further configured to drive the switch module to disconnect the power connection when an open circuit fault occurs in the first leakage detection line and/or the second leakage detection line.

4. The power line leakage detection protection device of claim 1, wherein the detection monitor module comprises at least one resistor coupled to the leakage detection module, the first current carrying line and the second current carrying line.

5. The power line leakage detection protection device of claim 2, wherein the driving module comprises:

a solenoid configured to generate an electromagnetic force for driving the switching module; and

at least one semiconductor element coupled to the solenoid and the detection monitoring module, wherein the semiconductor element causes the solenoid to generate the electromagnetic force to drive the switching module to disconnect the power connection under the action of a leakage fault signal and/or an open fault signal.

6. The power line leakage detection protection device of claim 5, wherein said driving module further comprises:

a comparison unit configured to generate a threshold signal;

wherein the comparing unit prevents the semiconductor element from controlling the solenoid to drive the switching module to disconnect the power connection when the signal output by the detection monitoring module is lower than the threshold signal;

when at least one of the first leakage current signal, the second leakage current signal, and the open-circuit detection signal is greater than the threshold signal, the comparing unit generates the leakage fault signal or the open-circuit fault signal.

7. A power line leakage detection protection device according to claim 6, wherein said comparing unit is selected from one of the following: a voltage regulator tube, a trigger tube, a comparator, a TVS tube and an optical coupler.

8. The power line leakage detection protection device of claim 5, wherein the semiconductor element is selected from one of: silicon controlled, bipolar transistor, field effect transistor and photoelectric coupling element.

9. The power line leakage detection protection device of claim 5, wherein said driving module further comprises:

a half-bridge rectification unit coupled to the solenoid and the semiconductor element, configured to provide a rectified drive signal to the solenoid; or

A full-bridge rectification unit coupled to the solenoid and the semiconductor element, configured to provide a rectified driving signal to the solenoid.

10. An electrical connection apparatus, comprising:

a housing; and

the power supply line leakage detection protection device according to any one of claims 1 to 9, which is housed in the housing.

11. An electrical consumer, characterized in that it comprises:

a load device;

an electrical connection device coupled between a power supply line and the load device for supplying power to the load device, wherein the electrical connection device comprises the power line leakage detection protection apparatus according to any one of claims 1-9.

Images