CN117578342A - Power line leakage detection protection device, electric connection equipment and electric appliance - Google Patents
Power line leakage detection protection device, electric connection equipment and electric appliance Download PDFInfo
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- CN117578342A CN117578342A CN202210944665.2A CN202210944665A CN117578342A CN 117578342 A CN117578342 A CN 117578342A CN 202210944665 A CN202210944665 A CN 202210944665A CN 117578342 A CN117578342 A CN 117578342A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
- H02H3/044—Checking correct functioning of protective arrangements, e.g. by simulating a fault
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/14—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to occurrence of voltage on parts normally at earth potential
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to mechanical injury, e.g. rupture of line, breakage of earth connection
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Abstract
The invention provides a power line leakage detection protection device, which comprises: the switch module is used for controlling the electric power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line which is coated with a first current carrying line and used for collecting a first leakage current signal on the first current carrying line, and a second leakage detection line which is coated with a second current carrying line and 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 is used for generating an open circuit detection signal to detect whether open circuit faults exist in the first electric leakage detection wire and the second electric leakage detection wire; 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 the switch module disconnects the electric power connection between the input end and the output end when the test switch is disconnected. The device detects two current-carrying lines and detection lines, and has simple circuit structure, low cost and high safety.
Description
Technical Field
The invention relates to the field of electricity, in particular to a power line leakage detection protection device, electric connection equipment and an electric appliance.
Background
The utility model provides a power cord leakage detection protection device (abbreviated as "LCDI device" below) is a kind of safety protection device for electric fires, its main structure is the power cord with plug, and the main function is to detect that the power plug has leakage current to between the wire live wire, the zero line of the power cord between the load electrical apparatus (for example air conditioner, dehumidifier) and wire inoxidizing coating (shielding), and cut off the consumer power, prevent the production of conflagration to provide safety protection. Accordingly, the LCDI device can prevent arc fault fires caused by damage to the power line, a decrease in insulation strength, and the like due to live (L line), neutral (N line), ground wire aging, wear, extrusion, or animal biting among the power lines.
When the current LCDI device is opened, the leakage detection line (shielding line) is opened, and the circuit is broken, and the current LCDI device does not have a protection function, the product can still work normally. There are fire or other electrical safety hazards.
Therefore, there is a need for a power line leakage detection protection device capable of detecting a leakage detection line.
Disclosure of Invention
In view of the foregoing, an aspect of the present invention provides a power line leakage detection protection device, including:
a switch module configured to control a power connection between an input and an output of the power line;
a leakage detection module comprising a first leakage detection line wrapping a first current carrying line in the power supply line 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 in the power supply line 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
the test module comprises at least one test switch, the test switch is coupled with the first leakage detection line or the second leakage detection line, wherein 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
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 detect 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 and 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 driving module includes:
a solenoid configured to generate electromagnetic force for driving the switching module; and
at least one semiconductor element coupled to the solenoid and the detection and monitoring module, which causes the solenoid to generate the electromagnetic force under the action of a leakage fault signal and/or an open circuit fault signal to drive the switching module to disconnect the power connection.
In one embodiment, the signal processing module includes:
a comparison unit configured to generate a threshold signal;
when the signal output by the detection monitoring module is lower than the threshold signal, the comparison unit prevents the semiconductor element from controlling the solenoid to drive the switch module to disconnect the power connection;
the comparison unit generates the leakage fault signal or the open circuit fault 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.
In one embodiment, the comparison unit is selected from one of the following: the device comprises a voltage stabilizing 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 rectifier, bipolar transistor, field effect transistor and photocoupling component.
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 driving signal to the solenoid; or alternatively
A full bridge rectifier unit coupled to the solenoid and the semiconductor element, configured to provide a rectified drive signal to the solenoid.
In view of the above problems, a second aspect of the present invention proposes an electrical connection device comprising: a housing; and a power line leakage detection protection device according to any one of the embodiments of the first aspect, the power line leakage detection protection device being housed in the housing.
In view of the foregoing, a third aspect of the present invention provides an electrical apparatus, 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, wherein the electrical connection device comprises a power line leakage detection protection device according to any of the embodiments of the first aspect.
In the invention, the two electric leakage detection lines are respectively arranged to cover one current carrying line and form an electric leakage detection loop together with the detection monitoring module, the testing module, the driving module and the switching module, so that the electric leakage condition on the two current carrying lines or the open circuit condition of the two electric leakage detection lines can be detected independently. Furthermore, the power line leakage detection protection device provided by the invention can effectively reduce or eliminate the trigger electrode bias voltage of the semiconductor element for tripping under the condition that no leakage fault occurs, so that the LCDI works more reliably and stably. In addition, the power line leakage detection protection device provided by the invention has the advantages of simple circuit structure, low cost and high safety.
Drawings
The embodiments are shown and described with reference to the drawings. The drawings serve to illustrate the basic principles and thus only show aspects necessary for understanding the basic principles. The figures are not to scale. In the drawings, like reference numerals refer to like features.
Fig. 1 shows a structural 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 the 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 illustrated 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 of the terms involved in the present invention will be explained first for better understanding of the present invention.
The terms "connected," "coupled," or "coupled" and the like as used herein are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms "a," "an," "a group," or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one.
The terms "comprising," including, "and similar terms used herein should be interpreted as open-ended terms, i.e., including, but not limited to," meaning that other elements may also be included. 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 forth.
The invention mainly focuses on the following technical problems: how to improve the working stability of the power line leakage detection protection device.
In order to solve the above problems, according to the present general inventive concept, there is provided a power line leakage detection protection device including: the switch module is used for controlling the electric power connection between the input end and the output end of the power line; the leakage detection module comprises a first leakage detection line which is coated with a first current carrying line and used for collecting a first leakage current signal on the first current carrying line, and a second leakage detection line which is coated with a second current carrying line and 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 is used for generating an open circuit detection signal to detect whether open circuit faults exist in the first electric leakage detection wire and the second electric leakage detection wire; 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, wherein 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 a structural 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 switching module 103, a leakage detection module 104, a test module 105, a detection monitoring module 106, and a driving module 107. The switching module 103 controls the electrical 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 first leakage current signals on the first current carrying line, and the second leakage detection line wraps a second current carrying line in the power line and collects second leakage current signals on the second current carrying line. The detection monitor 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 electrical connection between the input terminal and the output terminal. The driving module 107 is coupled to the switching module 103, the leakage detection module 104 and the detection monitoring module 106, and is configured to drive the switching module 10 to disconnect the power connection when the first leakage detection line and/or the second leakage detection line detects the leakage current signal. In the power line leakage detection protection device 100, two leakage detection lines respectively cover a current carrying line and form a leakage detection loop together with a test module, a detection monitoring module and a driving module. Thus, the apparatus 100 can detect the leakage condition on the two current carrying lines or the disconnection condition of the two leakage detection lines individually.
In some embodiments, the driving module 107 is further configured to drive the switching module 103 to disconnect power when the first leakage detection line and/or the second leakage detection line fails to open. By providing the driving module 107, on the one hand, the power connection can be disconnected when a 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 so as to prevent the driving module 107 from being tripped by mistake.
In some embodiments, the drive module 107 includes a solenoid and at least one semiconductor element. The solenoid generates electromagnetic force for driving the switching module 103, and the semiconductor element is coupled to the solenoid and the detection monitoring module 106, which causes the solenoid to generate electromagnetic force to drive the switching module 103 to disconnect power under the action of the leakage fault signal and/or the open circuit fault signal. The semiconductor element may be a thyristor, a bipolar transistor, a field effect transistor or a photo-coupling element.
In some embodiments, the drive module 107 further comprises: a comparison unit configured to generate a threshold signal; when the signal output by the detection and monitoring module 106 is lower than the threshold signal, the comparison unit prevents the semiconductor element from controlling the solenoid to drive the switch module to disconnect the power connection; the comparison unit generates a leakage fault signal or an open circuit fault 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 comparison unit is selected from one of the following: the device comprises a voltage stabilizing tube, a trigger tube, a comparator, a TVS tube and an optical coupler.
In some embodiments, the drive module 107 further includes a half bridge rectification unit or a full bridge rectification unit. The half-bridge rectifying unit is coupled to the solenoid and the semiconductor element and is used for providing a driving signal subjected to rectification processing for the solenoid; the full-bridge rectifying unit is coupled to the solenoid and the semiconductor element for providing a rectified driving signal to the solenoid.
Example one
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 monitor module 106, and a drive module 107. As shown in fig. 2, the switch module 103 includes a RESET switch RESET for controlling the power connection between the input LINE and the output LOAD of the power LINE. The power supply line comprises a first current carrying line 11 (HOT, live), a second current carrying line 12 (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 drain detection line 141 wraps the first current carrying line 11, and the second drain detection line 142 wraps the second current carrying line 12. In this embodiment, a first end of each of the first and second leakage detection lines 141 and 142 is an end remote from the LOAD, which is located on the left side in fig. 2; the second end is the end near the LOAD, to the right in fig. 2.
As shown in fig. 2, the first and second leakage detection lines 141 and 142 are connected in series. The first end of the second leakage detection line 142 is connected to one end of a resistor R5 of the detection monitoring module 106, forming a connection point a, and the other end of the resistor R5 is connected to the first current line 11. The first end of the first leakage detection line 141 is connected to one end of a resistor R6 of the detection monitor module 106 via the TEST module 105 (e.g., a TEST switch TEST), and the other end of the resistor R6 is connected to the cathode of the thyristor SCR of the driving module 107, one end of the capacitor C2, and anodes of the diodes D1 and D2. In the 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; both ends of the capacitor C2 are respectively connected to the control electrode and the cathode of the SCR. The cathode of the 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 the solenoid SOL. The other end of the solenoid SOL is connected to the second current line 12 and to the RESET switch RESET. The cathode of the diode D1 is connected to the first current line 11 and to the RESET switch RESET.
When both the first and second leakage detection lines 141, 142 are operating normally (not open), the current of the first current carrying line 11 flows through the resistor R5-second leakage detection line 142-first leakage detection line 141-TEST switch-resistor R6-capacitor D2-solenoid SOL to the loop of the second current carrying line 12. By setting the resistance values of the resistors R5 and R6, the voltage of the point A is lower than the threshold voltage of the voltage stabilizing tube ZD1, so that the voltage of the SCR control electrode is limited to be extremely low, and the SCR is ensured not to trigger 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 electrified for use.
When the first current carrying wire 11 generates a leakage current signal (first leakage current signal) or the second current carrying wire 12 generates a leakage current signal (second leakage current signal), the potential at the point a rises, and the current triggers the SCR to be conducted through the first current carrying wire 11, the first leakage detecting wire 141, the second leakage detecting wire 142 and the resistor R2, the voltage regulator tube ZD1, a larger current is generated on the solenoid SOL, a magnetic field with enough size is formed, the RESET switch RESET of the switch module 103 is driven to trip, and then the power connection between the input end LINE and the output end LOAD is cut off. Thus, the device can independently detect 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 opened or closed, the resistor R6 loses the voltage division function, the potential at the point a rises, the current triggers the SCR to be turned on through the first current-carrying LINE 11-resistor R5-resistor R2-regulator ZD1, the solenoid SOL drives the RESET switch RESET of the switch module 103 to trip, and then the power connection between the input end LINE and the output end LOAD is cut off. Accordingly, the apparatus can independently detect whether the first and second leakage detection lines 141 and 142 fail.
Other modules of the power line leakage detection protection device may also be tested for faults by the test module 105. In this embodiment, when all the elements of the device work 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 voltage regulator tube ZD1 cannot trigger the SCR to conduct, and the product works normally.
When the TEST switch TEST is pressed down to disconnect the TEST switch TEST, the resistor R6 loses the voltage dividing function, the potential at the point a rises, the current triggers the silicon controlled rectifier SCR to be conducted through the first current LINE 11-resistor R5-resistor R2-voltage stabilizing tube ZD1, the RESET switch RESET of the solenoid SOL driving switch module 103 is tripped, and then the electric connection between the input end LINE and the output end LOAD is cut off. Thus, 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 the 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 the connection full-bridge rectifying unit DB, and the other end of the resistor R3 is connected to the first end of the first leakage detection line 141 by the connection testing module 105 (e.g., the TEST switch TEST); the first end of the 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 the base electrode of a triode Q1 of the driving module 107, and the collector electrode of the triode Q1 is respectively connected to the control electrode of the silicon controlled rectifier SCR and one end of the resistor R1 to form a connection point a; the other end of the resistor R1 is respectively connected to the full-bridge rectifying 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 a connection full bridge rectifier unit DB.
When both the first and second leakage detection lines 141, 142 are operating normally (not open), the current of the first current line 11 flows through the full-bridge rectifying unit DB-resistor R3-TEST switch TEST-first leakage detection line 141-second leakage detection line 142-resistor R2-triode Q1-full-bridge rectifying unit DB-solenoid SOL to the second current line 12. When 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 be extremely low, and the silicon controlled rectifier SCR is ensured not to trigger 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 electrified for use.
When the first current carrying LINE 11 generates a leakage current signal (first leakage current signal) and the second current carrying LINE 12 is at the upper half cycle, current flows through the second current carrying LINE 12 through the full-bridge rectifying unit DB-resistor R3-TEST switch TEST-first leakage detection LINE 141-first current carrying LINE 11, when the first leakage current signal exceeds a set threshold value, the current flowing through the resistor R2 cannot drive Q1 and Q1 to be in a cut-off state by adjusting the resistance values of the resistor R3 and the resistor R2, the point a potential rises, and the current flows through the second current carrying LINE 12-full-bridge rectifying unit DB-resistor R1 to trigger the thyristor SCR driving solenoid SOL to disconnect the power connection between the input terminal LINE and the output terminal LOAD of the switch module 103.
Similarly, when the second current carrying LINE 12 generates a leakage current signal (second leakage current signal) and the first current carrying LINE 11 is in the upper half cycle, current flows through the first current carrying LINE 11 through the full-bridge rectifying unit DB-resistor R3-TEST switch TEST-first leakage detection LINE 141-second leakage detection LINE 142-second current carrying LINE 12, and when the second leakage current signal exceeds a set threshold value, the current flowing through the resistor R2 cannot drive the transistor Q1 by adjusting the resistance values of the resistor R3 and the resistor R2, the transistor Q1 is in an off state, the point a potential rises, and the current triggers the thyristor SCR driving solenoid SOL through the first current carrying LINE 11-full-bridge rectifying unit DB-resistor R1 to disconnect the power connection between the input terminal LINE and the output terminal LOAD of the switch module 103.
Thus, the apparatus can independently detect whether the first and second leakage detection lines 141 and 142 fail.
When the first leakage detection LINE 141 or the second leakage detection LINE 142 is opened or disconnected, no current drives the triode Q1 through the resistor R2, so that the triode Q1 is in a cut-off state, the potential at point a is increased, and the current triggers the thyristor SCR driving solenoid SOL through the current-carrying LINE-full bridge rectifying unit DB-resistor R1 to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103.
Other modules of the power line leakage detection protection device may also be tested for faults by the test module 105. In this embodiment, when all the elements of the device normally operate 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 triode Q1 normally operates without triggering the SCR to conduct, and the product normally operates.
When the TEST switch TEST is pressed 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 point a rises, and the current triggers the thyristor SCR driving solenoid SOL through the current-carrying LINE-full bridge rectifying unit DB-resistor R1 to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103. Thus, 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 the power line leakage detection protection device according to the present invention. In the embodiment of fig. 4, the leakage detection module 104 includes a first leakage detection line 141, a second leakage detection line 142, and a connection line 21. The first drain detection line 141 wraps the first current carrying line 11, and the second drain detection line 142 wraps the second current carrying line 12. Similar to the embodiment of fig. 2, in this embodiment, the first end of each of the first and second leakage detection lines 141, 142, and the connection line 21 is the end away 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 to the right 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 ends of the connection lines 21. The first end of the first leakage detection line 141 is connected to one end of the resistor R5 of the detection monitor module 106, the first end of the connection line 21 is connected to one end of the TEST module 105 (e.g., the TEST switch TEST), the first end of the second leakage detection line 142 is connected to one end of the resistor R4 of the detection monitor module 106, and the other end of the TEST module 105 is connected to one end of the resistor R1 of the detection monitor 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 with one end of the resistor R3 in the driving module 107, one end of the capacitor C1, the cathode of the SCR and the anodes of the diodes D2 and D1. 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 the control electrode of the SCR, and a capacitor C1 is connected between the control electrode of the SCR and the cathode in parallel; the anode of the SCR and the cathode of the diode D1 are connected with one end of the solenoid SOL.
When both the first and second leakage detection lines 141, 142 are operating normally (not open), the current of the second current carrying line 12 flows through the solenoid SOL-resistor R1-TEST switch TEST-first leakage detection line 141-resistor R5-diode D2-solenoid SOL-first current carrying line 11 loop; similarly, the current of the second current carrying line 12 flows through the solenoid SOL-resistor R1-TEST switch TEST-second leakage detection line 142-resistor R4-diode D2-solenoid SOL-first current carrying line 11 loop. The voltage of the point A is reduced by adjusting the resistance values of the resistors R1, R4 and R5, so that 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, and the silicon controlled rectifier SCR is ensured not to trigger the device to trip. At this point, the switch module 103 is in a closed state, and the device is normally powered on for use.
When the first current LINE 11 generates a leakage current signal (first leakage current signal) or the second current LINE 12 generates a leakage current signal (second leakage current signal), the potential at point a increases, and when the leakage current signal exceeds a set threshold value, the current triggers the SCR driving solenoid SOL through the current LINE-resistor R2 to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103.
When at least one of the leakage detection LINEs is opened or closed, the potential at the point a rises, and the current flowing through the second current LINE 12-the solenoid SOL-resistor R1-resistor R2 triggers the SCR driving solenoid SOL to disconnect the power connection between the input LINE and the output LOAD by the switching module 103.
Other modules of the power line leakage detection protection device may also be tested for faults by the test module 105. In this embodiment, when all the elements of the device work 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 resistor R2 cannot trigger the SCR to conduct, and the product works normally.
When the TEST switch TEST is pressed to turn off the TEST switch TEST, the potential at the point a rises, and the current flowing through the second current LINE 12-the solenoid SOL-resistor R1-resistor R2 triggers the SCR driving solenoid SOL to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103. Thus, 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 the power line leakage detection protection device according to the present invention. In the embodiment of fig. 5, the leakage detection module 104 includes a first leakage detection line 141, a second leakage detection line 142, and connection lines 21 and 22. The first drain detection line 141 wraps the first current carrying line 11, and the second drain detection line 142 wraps the second current carrying line 12. In this embodiment, the first end of each of the first and second leakage detection lines 141, 142, and the connection lines 21 and 22 is an end remote 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 to the right 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 monitor module 106, forming a connection point a. The first end of the second leakage detection line 142 is connected to one end of the resistor R51 of the detection monitor module 106, forming a connection point B. The first end of the connecting wire 21 is sequentially connected with 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 connecting wire 22 is sequentially connected with 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, C22 of the driving module 107, the cathode of the SCR1, the cathode of the SCR11, and the anodes of the diodes D2 and D1; the resistor R2 of the driving module 107 is arranged between the connection point A and the cathode of the voltage stabilizing tube ZD1, and the capacitor C1 is arranged between the cathode of the voltage stabilizing tube ZD1 and the resistor R6; the anode of the voltage stabilizing tube ZD1 is coupled to the control electrode of the silicon controlled rectifier SCR1, the capacitor C2 is connected in parallel between the control electrode and the cathode of the silicon controlled rectifier SCR1, and the anode of the silicon controlled rectifier SCR1 is connected to the solenoid SOL. A resistor R21 of the driving module 107 is disposed between the connection point B and the cathode of the regulator tube ZD11, and a capacitor C11 is disposed between the cathode of the regulator tube ZD1 and the resistor R6; the anode of the voltage regulator tube ZD11 is coupled to the control electrode of the silicon controlled rectifier SCR11, the capacitor C21 is connected in parallel between the control electrode and the cathode of the silicon controlled rectifier SCR11, and the anode of the silicon controlled rectifier SCR11 is connected to the solenoid SOL.
When the first and second leakage detection lines 141, 142 and the connection lines 21 and 22 are all operating normally (not open or broken), the current of the first current carrying line 11 flows through the R5-first leakage detection line 141-connection line 21-TEST switch TEST 1-resistor R6-diode D2-solenoid SOL to the loop of 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 SCR1 is limited to an extremely low level, and the SCR1 is ensured not to trigger the false tripping of the device. Similarly, the current of the second current carrying line 12 flows through the R51-second leakage detection line 142-connection line 22-TEST switch TEST 2-resistor R61-diode D2-solenoid SOL to the loop of the first current carrying line 11. By setting the resistance of resistors R51 and R61, point B is limited to a lower potential that is below the threshold voltage of ZD11, thereby limiting the voltage at the trigger electrode of SCR11 to a very low level, ensuring that SCR11 does not trigger false tripping of the device. At this time, the switch module 103 is in a closed state, and the product is normally electrified for use.
When leakage current occurs in the first current carrying LINE 11, the potential at the point a rises, the thyristor SCR1 is triggered by the first current carrying LINE 11, the first leakage detection LINE 141, the resistor R2 and the regulator ZD1, and the solenoid SOL is driven to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103. Similarly, when leakage current occurs in the second current carrying LINE 12, the potential of the point B rises, the thyristor SCR11 is triggered by the second current carrying LINE 12, the second leakage detection LINE 142, the resistor R21 and the voltage regulator tube ZD11, and the solenoid SOL is driven to disconnect the power connection between the input terminal LINE and the output terminal LOAD.
When the first leakage detection LINE 141 is opened or the TEST switch TEST1 is operated to be turned off, the voltage division function of R6 is lost, the potential at point a rises, the thyristor SCR1 is triggered by the first current LINE 11-resistor R5-resistor R2-regulator ZD1, and the solenoid SOL is driven to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103.
Similarly, when the second leakage detection LINE 142 is opened or the TEST switch TEST2 is operated to be turned off, the resistor R61 loses the voltage dividing function, the potential of the point B rises, the thyristor SCR11 is triggered by the second current carrying LINE 12-resistor R51-resistor R21-regulator ZD11, and the solenoid SOL is driven to disconnect the power connection between the input terminal LINE and the output terminal LOAD by the switch module 103.
A second aspect of the present invention proposes an electrical connection device comprising: a housing; and a power line leakage detection protection device according to any one of the above embodiments, the power line leakage detection protection device being housed in the housing.
A third aspect of the present invention proposes an electrical appliance comprising: 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 device of any of the above embodiments.
Therefore, 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. The utility model provides a power cord electric leakage detection protection device which characterized in that, power cord electric leakage detection protection device includes:
a switch module configured to control a power connection between an input and an output of the power line;
a leakage detection module comprising a first leakage detection line wrapping a first current carrying line in the power supply line 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 in the power supply line 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
the test module comprises at least one test switch, the test switch is coupled with the first leakage detection line or the second leakage detection line, wherein 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.
2. The power line leakage detection protection device according to claim 1, further comprising:
a drive module coupled to the switch module, the leakage detection module, and the detection monitor module, and configured to drive the switch module to disconnect the power connection when the first leakage detection line and/or the second leakage detection line detect a leakage current signal.
3. The power line leakage detection protection device of claim 2, wherein the drive 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 monitoring 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 according to claim 2, wherein the driving module comprises:
a solenoid configured to generate electromagnetic force for driving the switching module; and
at least one semiconductor element coupled to the solenoid and the detection and monitoring module, which causes the solenoid to generate the electromagnetic force under the action of a leakage fault signal and/or an open circuit fault signal to drive the switching module to disconnect the power connection.
6. The power line leakage detection protection device of claim 5, wherein the drive module further comprises:
a comparison unit configured to generate a threshold signal;
when the signal output by the detection monitoring module is lower than the threshold signal, the comparison unit prevents the semiconductor element from controlling the solenoid to drive the switch module to disconnect the power connection;
the comparison unit generates the leakage fault signal or the open circuit fault 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.
7. The power line leakage detection protection device according to claim 6, wherein the comparison unit is selected from one of: the device comprises a voltage stabilizing tube, a trigger tube, a comparator, a TVS tube and an optical coupler.
8. The power line leakage detection protection device according to claim 5, wherein the semiconductor element is selected from one of: silicon controlled rectifier, bipolar transistor, field effect transistor and photocoupling component.
9. The power line leakage detection protection device of claim 5, wherein the drive module further comprises:
a half-bridge rectification unit coupled to the solenoid and the semiconductor element, configured to provide a rectified driving signal to the solenoid; or alternatively
A full bridge rectifier unit coupled to the solenoid and the semiconductor element, configured to provide a rectified drive signal to the solenoid.
10. An electrical connection apparatus, the electrical connection apparatus comprising:
a housing; and
the power cord leakage detection protection device according to any one of claims 1-9, the power cord leakage detection protection device being housed in the housing.
11. An electrical appliance, the electrical appliance comprising:
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 a power line leakage detection protection device according to any one of claims 1-9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944665.2A CN117578342A (en) | 2022-08-08 | 2022-08-08 | Power line leakage detection protection device, electric connection equipment and electric appliance |
| US17/819,283 US20240044998A1 (en) | 2022-08-08 | 2022-08-11 | Leakage current detection and interruption device for power cord and related electrical connectors and electrical appliances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944665.2A CN117578342A (en) | 2022-08-08 | 2022-08-08 | Power line leakage detection protection device, electric connection equipment and electric appliance |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117578342A true CN117578342A (en) | 2024-02-20 |
Family
ID=89883112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210944665.2A Pending CN117578342A (en) | 2022-08-08 | 2022-08-08 | Power line leakage detection protection device, electric connection equipment and electric appliance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117578342A (en) |
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2022
- 2022-08-08 CN CN202210944665.2A patent/CN117578342A/en active Pending
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