CN219018452U - Leakage protection device, electric connection equipment and electric appliance - Google Patents
Leakage protection device, electric connection equipment and electric appliance Download PDFInfo
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- CN219018452U CN219018452U CN202223382182.2U CN202223382182U CN219018452U CN 219018452 U CN219018452 U CN 219018452U CN 202223382182 U CN202223382182 U CN 202223382182U CN 219018452 U CN219018452 U CN 219018452U
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Abstract
The utility model provides a leakage protection device, comprising: a switching module coupled between an input and an output of a power line and configured to control a power connection between the input and the output; a leakage detection module configured to detect a leakage current signal on the power line and to drive the switching module to disconnect the power connection when the leakage current signal is detected; the monitoring module is configured to generate the simulated leakage current signal so as to detect whether the leakage current detection module works normally or not; and a fault detection module configured to detect a wiring fault of the power line and to issue a fault indication signal to indicate a fault state upon detecting the wiring fault of the power line. The device can prompt the user to timely stop using the electric appliance through the fault indication signal when detecting the wiring fault, so that potential safety hazards are eliminated. In addition, the electric leakage protection device has the advantages of simple circuit structure, low cost and high safety.
Description
Technical Field
The utility model relates to the field of electric appliances, in particular to a leakage protection device, electric connection equipment and an electric appliance.
Background
With the development of society, various household appliances are increasingly widely applied, and the safety of electricity use is also becoming important. However, the switch of the household appliance is generally turned off only by the live wire, if the position of the live wire of the plug is misplaced (e.g. reversely connected), the switch of the household appliance is turned off to be the live wire, which leads to voltage inside the appliance even if the appliance does not work, and potential safety hazards exist. When the zero line is lost, the voltage is still present in the electric appliance, and potential safety hazards are also present. When the ground wire is suspended, the electrical appliance has the risk of electrification of the shell.
The existing leakage protection device cannot detect or prompt wiring faults of various power lines. Therefore, there is a need for a leakage protection device capable of detecting a power line failure.
Disclosure of Invention
Based on the above-mentioned problem that the existing leakage protection device cannot detect or prompt the wiring faults of various power lines, the first aspect of the present utility model proposes a leakage protection device. The leakage protection device comprises a switch module coupled between an input end and an output end of a power line and configured to control power connection between the input end and the output end; a leakage detection module configured to detect a leakage current signal on the power line and to drive the switching module to disconnect the power connection when the leakage current signal is detected; the monitoring module is configured to generate the simulated leakage current signal so as to detect whether the leakage current detection module works normally or not; and a fault detection module configured to detect a wiring fault of the power line and to issue a fault indication signal to indicate a fault state upon detecting the wiring fault of the power line.
In some embodiments, the power line includes a first current carrying line for connection to a grid hot line, a second current carrying line for connection to a grid neutral line, and a ground line for connection to a grid ground line, the wiring fault of the power line includes the second current carrying line being absent or floating, and the fault detection module includes: a load module coupled between the first current carrying line and the second current carrying line and configured to provide a current loop between the first current carrying line and the second current carrying line; a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located; and an indication module coupled in series with the first current limiting module and between the second current carrying line and the ground line, and configured to issue the fault indication signal when the second current carrying line is missing or floating.
In some embodiments, the load module includes at least one of a resistor, a capacitor, and an inductor, the first current limiting module includes at least one of a capacitor and a resistor, and the indication module includes at least one of an indicator light, a buzzer, and a speaker.
In some embodiments, the power line includes a first current carrying line for connection to a grid hot line, a second current carrying line for connection to a grid neutral line, and a ground line for connection to a grid ground line, the wiring fault of the power line includes the ground line being absent or floating, and the fault detection module includes: a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located; a second current limiting module coupled between the first current carrying line and the ground line and configured to limit a current in a loop in which the second current limiting module is located; and an indication module connected in series with the first current limiting module and coupled between the second current carrying line and the ground line, and configured to emit the fault indication signal when the ground line is missing or floating.
In some embodiments, the first and second current limiting modules each include at least one of a capacitance and a resistance, and the indication module includes at least one of an indicator light, a buzzer, and a speaker.
In some embodiments, the power line includes a first current carrying line for connection to a grid hot line, a second current carrying line for connection to a grid neutral line, and a ground line for connection to a grid ground line, the wiring fault of the power line includes at least one of the second current carrying line being absent or suspended, the ground line being absent or suspended, the first and second current carrying lines being reverse connected, the second and ground line being reverse connected, and the ground line being abnormally charged, and the fault detection module includes: a load module coupled between the first current carrying line and the second current carrying line and configured to provide a current loop between the first current carrying line and the second current carrying line; a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located; a second current limiting module coupled between the first current carrying line and the ground line and configured to limit a current in a loop in which the second current limiting module is located; and an indication module connected in series with the first current limiting module and coupled between the second current carrying line and the ground line, and configured to issue the fault indication signal when the fault occurs in the power line.
In some embodiments, the load module includes at least one of a resistor, a capacitor, and an inductor, the first current limiting module and the second current limiting module include at least one of a capacitor and a resistor, respectively, and the indication module includes at least one of an indicator light, a buzzer, and a speaker.
A second aspect of the present utility model proposes an electrical connection device comprising: a housing; and a leakage protection device according to any one of the embodiments of the first aspect, the leakage protection device being housed in the housing.
A third aspect of the present utility model proposes an electrical appliance comprising: a load device; and an electrical connection device coupled between the power line and the load device for supplying power to the load device, wherein the electrical connection device comprises a leakage protection apparatus according to any of the embodiments of the first aspect.
According to the utility model, the leakage protection device can detect the fault of the power line, and prompt a user to stop using the electric appliance in time through the fault indication signal when the fault is detected, so that potential safety hazards are eliminated. In addition, the leakage protection device provided by the utility model 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. In addition, a connection between each frame in the architecture diagram indicates that there is an electrical coupling between two frames, and the absence of a connection between two frames does not indicate that the two frames are not coupled.
Fig. 1 shows a schematic diagram of an earth leakage protection device according to an embodiment of the present utility model;
fig. 2 shows a schematic diagram of a first embodiment of a leakage protection device according to the present utility model;
fig. 3 shows a schematic diagram of a second embodiment of the earth leakage protection device according to the present utility model;
fig. 4 shows a schematic diagram of a third embodiment of the earth leakage protection device according to the present utility model; and
fig. 5 shows a schematic diagram of a fourth embodiment of the earth leakage protection device according to the present utility model.
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 utility model may be practiced. The illustrated embodiments are not intended to be exhaustive of all embodiments according to the utility model. 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 utility model. The following detailed description is, therefore, not to be taken in a limiting sense, and the scope of the present utility model is defined by the appended claims.
Before describing embodiments of the present utility model, some of the terms involved in the present utility model will be explained first for better understanding of the present utility model.
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 construed to be 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. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The utility model aims to provide an electric leakage protection device. The device comprises a fault detection module which is used for detecting the wiring fault of the power line, and prompting a user to stop using the electric appliance in time through a fault indication signal when the wiring fault is detected, so that potential safety hazards are eliminated. The leakage protection device has the advantages of simple circuit structure, low cost and high safety.
Fig. 1 shows a schematic diagram of an earth leakage protection device according to an embodiment of the present utility model. As shown in fig. 1, the earth leakage protection device 100 includes a switch module 103, an earth leakage detection module 104, a monitoring module 105, and a fault detection module 106. The switching module 103 is coupled between the input 101 and the output 102 of the power line and controls the electrical connection between the input 101 and the output 102 of the power line. The leakage detection module 104 detects a leakage current signal on the power line, and drives the switching module 103 to disconnect power when the leakage current signal is detected. The monitoring module 105 generates an analog leakage current signal to detect whether the leakage detection module 104 is operating normally. That is, if the leakage detection module 104 is able to detect the simulated leakage current signal and drive the switching module 103 to disconnect the power connection, it indicates that it is operating normally, otherwise it indicates that it is not operating normally. The fault detection module 106 detects a wiring fault of the power line and issues a fault indication signal to indicate a fault condition when a wiring fault of the power line is detected. The power supply line may comprise a first current carrying line for connection to a mains line of the power grid, a second current carrying line for connection to a neutral line of the power grid and a ground line for connection to a ground line of the power grid. The wiring fault of the power supply line may be, for example, one or more of a missing or floating second current carrying line, a missing or floating ground line, a reverse connection of the first current carrying line and the second current carrying line, a reverse connection of the second current carrying line and the ground line, and abnormal electrification of the ground line. The ground fault indication signal may be, for example, a sound signal or an indicator light signal, or may include both a sound signal and an indicator light signal.
The leakage protection device 100 can detect the wiring fault of the power line, and prompt a user to stop using the electric appliance in time through the fault indication signal when the wiring fault is detected, so that potential safety hazards are eliminated. In addition, the leakage protection device 100 provided by the utility model has the advantages of simple circuit structure, low cost and high safety.
In some embodiments, the earth leakage protection device 100 is capable of detecting a missing or floating fault of the second current line. The fault detection module 106 includes a load module, a first current limit module, and an indication module. The load module is coupled between the first current-carrying wire and the second current-carrying wire, the first current-limiting module is coupled between the second current-carrying wire and the ground wire and is coupled with the load module, the indication module is connected in series with the first current-limiting module and is coupled between the second current-carrying wire and the ground wire, and the indication module sends out a fault indication signal when the second current-carrying wire is absent or suspended. The load module is used for providing a current loop between the first current-carrying line and the second current-carrying line, and the load module can be a single component or a circuit module formed by combining a plurality of components, so long as the current loop can be provided between the first current-carrying line and the second current-carrying line. In some embodiments, the load module may include at least one of a resistor, a capacitor, and an inductor. For example, the load module may include only a resistor, a capacitor, or an inductor, or may include a combination of a resistor and a capacitor, a combination of a resistor and an inductor, a combination of a capacitor and an inductor, or a combination of a resistor, a capacitor, and an inductor, or the like. The number of resistors, capacitors and inductors may be set as desired. As another example, the load module may include any combination of resistors, capacitors, and/or inductors with other components. In some embodiments, the load module may include components other than resistors, capacitors, and inductors, or a combination thereof. In some embodiments, the leakage detection module 104 may be implemented as a load module without providing additional components. The first current limiting module is used for limiting the current in the loop where the first current limiting module is located, and the first current limiting module can be a single component or a circuit module formed by combining a plurality of components, so long as the first current limiting module has a current limiting function. In some embodiments, the first current limiting module may include at least one of a capacitance and a resistance. For example, the first current limiting module may include only a capacitor or a resistor, or may include a combination of a capacitor and a resistor. The number of capacitors and resistors can be set as desired. When the first current limiting module comprises a capacitor, the first current limiting module also has a voltage isolation function. The indication module is used for sending out fault indication signals, and can be components capable of sending out indication signals, such as indication lamps (e.g. LEDs), buzzers, loudspeakers and the like, or can be a combination of the components.
In some embodiments, the earth leakage protection device 100 is capable of detecting a ground fault or a floating fault. The fault detection module 106 includes a first current limit module, a second current limit module, and an indication module. The first current limiting module is coupled between the second current carrying line and the ground line. The second current limiting module is coupled between the first current line and the ground line and coupled with the first current limiting module. The indication module is connected in series with the first current limiting module and is coupled between the second current carrying wire and the ground wire, and sends out a fault indication signal when the ground wire is absent or suspended. The first current limiting module and the second current limiting module are both used for limiting the current in the loop where the first current limiting module and the second current limiting module are located, and the first current limiting module and the second current limiting module can be single components or circuit modules formed by combining a plurality of components, so long as the circuit modules have a current limiting effect. In some embodiments, the first current limiting module and the second current limiting module may each include at least one of a capacitance and a resistance. For example, the first current limiting module and the second current limiting module may include only a capacitor or a resistor, respectively, or may include a combination of a capacitor and a resistor. The number of capacitors and resistors can be set as desired. When the first current limiting module or the second current limiting module comprises a capacitor, the first current limiting module or the second current limiting module also has a voltage isolation function. The indication module is used for sending out fault indication signals, and can be components capable of sending out indication signals, such as indication lamps (e.g. LEDs), buzzers, loudspeakers and the like, or can be a combination of the components.
In some embodiments, the leakage protection device 100 is capable of detecting at least one of a failure of the second current carrying line missing or floating, a ground line missing or floating, a first current carrying line and second current carrying line ground return, a second current carrying line and ground return, and a ground abnormal charge. The fault detection module 106 includes a load module, a first current limit module, a second current limit module, and an indication module. The load module is coupled between the first current-carrying line and the second current-carrying line, the first current-limiting module is coupled between the second current-carrying line and the ground line and is coupled with the load module, the second current-limiting module is coupled between the first current-carrying line and the ground line and is coupled with the first current-limiting module, the indication module is connected in series with the first current-limiting module and is coupled between the second current-carrying line and the ground line, and the indication module sends out a fault indication signal when the power line breaks down. The load module is used for providing a current loop between the first current-carrying line and the second current-carrying line, and the load module can be a single component or a circuit module formed by combining a plurality of components, so long as the current loop can be provided between the first current-carrying line and the second current-carrying line. In some embodiments, the load module may include at least one of a resistor, a capacitor, and an inductor. For example, the load module may include only a resistor, a capacitor, or an inductor, or may include a combination of a resistor and a capacitor, a combination of a resistor and an inductor, a combination of a capacitor and an inductor, or a combination of a resistor, a capacitor, and an inductor, or the like. The number of resistors, capacitors and inductors may be set as desired. As another example, the load module may include any combination of resistors, capacitors, and/or inductors with other components. In some embodiments, the load module may include components other than resistors, capacitors, and inductors, or a combination thereof. In some embodiments, the leakage detection module 104 may be implemented as a load module without providing additional components. The first current limiting module and the second current limiting module are both used for limiting the current in the loop where the first current limiting module and the second current limiting module are located, and the first current limiting module and the second current limiting module can be single components or circuit modules formed by combining a plurality of components, so long as the circuit modules have a current limiting effect. In some embodiments, the first current limiting module and the second current limiting module may each include at least one of a capacitance and a resistance. For example, the first current limiting module and the second current limiting module may include only a capacitor or a resistor, respectively, or may include a combination of a capacitor and a resistor. The number of capacitors and resistors can be set as desired. When the first current limiting module or the second current limiting module comprises a capacitor, the first current limiting module or the second current limiting module also has a voltage isolation function. The indication module is used for sending out fault indication signals, and can be components capable of sending out indication signals, such as indication lamps (e.g. LEDs), buzzers, loudspeakers and the like, or can be a combination of the components.
Fig. 2 shows a schematic diagram of a first embodiment of the earth leakage protection device according to the present utility model. As shown in fig. 2, the earth leakage protection device 200 includes a switch module 103, an earth leakage detection module 104, a monitor module 105, and a fault detection module 106. The power supply line comprises a first current carrying line 11, a second current carrying line 12 and a ground line 13. As shown in fig. 2, the switching module 103 comprises a reset switch for controlling the electrical connection between the input and the output of the first and second current lines 11, 12. The leakage detection module 104 includes a leakage detection ring CT1 through which the first current line 11 and the second current line 12 pass, a shielding wire covering the outer sides of the first current line 11, the second current line 12 and the ground line 13, a leakage detection chip IC1, a trip coil SOL1, a thyristor Q1, and a peripheral circuit of the leakage detection chip IC1. The monitoring module 105 comprises a series connection of a test switch and a resistor R1 coupled between the first current line 11 and the second current line 12. The fault detection module 106 includes a resistor R2 (load module), a capacitor C1 (first current limiting module), a resistor R3 and a light emitting diode LED1 (indication module) connected in series, a capacitor C3 (second current limiting module) and a resistor R4 connected in series. The resistor R2 is coupled between the first current-carrying line 11 and the second current-carrying line 12, the resistor R3, the capacitor C1 and the light-emitting diode LED1 are coupled between the second current-carrying line 12 and the ground line 13, and the resistor R4 and the capacitor C3 are coupled between the first current-carrying line 11 and the ground line 13 and are coupled with the capacitor C1 and the light-emitting diode LED 1.
Under normal operation, the first current line 11 is connected to the power grid live wire, the second current line 12 is connected to the power grid neutral wire, the ground wire 13 is connected to the power grid ground wire, the switch module 103 is in a reset state (i.e. a closed state), and the input ends and the output ends of the first current line 11 and the second current line 12 are connected. In this state, since there is no voltage between the second current-carrying line 12 and the ground line 13, no current flows in the loop from the second current-carrying line 12 to the ground line 13, and the light-emitting diode LED1 is not lit. When the first current-carrying wire 11 or the second current-carrying wire 12 is subjected to leakage current or the insulating layer is damaged and detected by the shielding wire, that is, when a leakage current signal exists in the power wire, the leakage detection coil CT1 detects that unbalanced currents exist in the first current-carrying wire 11 and the second current-carrying wire 12, generates corresponding induced voltages, and transmits the induced voltages to the leakage detection chip IC1. When the voltage output by the leakage detection coil CT1 is greater than the threshold value, the pin 5 of the leakage detection chip IC1 outputs a high level, whereas a low level is output. The high level of the pin 5 of the leakage detection chip IC1 is provided to the control electrode of the thyristor Q1, which triggers the thyristor Q1 to conduct, so that the current in the solenoid SOL1 changes, thereby generating electromagnetic force, and the driving switch module 103 disconnects the power connection between the input terminal and the output terminal of the first current carrying line 11 and the second current carrying line 12. When it is required to test whether the leakage protection device 200 works normally, the test switch of the monitoring module 105 is closed to form a current loop of the first current line 11-R1-the second current line 12, to generate an analog leakage current signal, if the switch module 103 disconnects the power connection between the input end and the output end of the first current line 11 and the second current line 12, it indicates that the leakage detection module 104 works normally, otherwise, it indicates that the leakage detection module 104 fails.
When the neutral line and the live line at the input end (such as a socket) are connected reversely, the second current carrying line 12 of the leakage protection device 200 is actually connected to the live line of the power grid, at this time, a voltage exists between the second current carrying line 12 and the ground line 13, the second current carrying line 12-R3-C1-LED 1-ground line 13 forms a current loop, the light emitting diode LED1 is lighted, namely, a fault indication signal is sent, a wiring fault exists on the power line, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the live wire and the ground wire at the input end (such as a socket) are reversely connected or abnormally electrified, the ground wire 13 of the leakage protection device 200 is actually connected into the live wire or abnormally electrified of the power grid, at the moment, voltage exists between the second current-carrying wire 12 and the ground wire 13, a current loop is formed by the second current-carrying wire 12-R3-C1-LED 1-ground wire 13, the light-emitting diode LED1 is lighted, namely, a fault indication signal is sent, the power wire is indicated to have a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the zero line at the input end (such as a socket) is absent or suspended, the second current carrying line 12 of the leakage protection device 200 is in a suspended state, and at this time, the first current carrying line 11-R2-R3-C1-LED 1-ground wire 13 forms a current loop, and the light emitting diode LED1 is lightened, that is, a fault indication signal is sent out to indicate that the power line has a fault, so that a user is prompted to stop using the electrical appliance and conduct fault detection.
When the ground wire at the input end (such as a socket) is missing or suspended, the ground wire 13 of the leakage protection device 200 is in a suspended state, and at this time, the second current-carrying wire 12-R3-C1-LED 1-C3-R4-first current-carrying wire 11 forms a current loop, and the light-emitting diode LED1 is lightened, that is, a fault indication signal is sent out to indicate that the power wire has a fault, so as to prompt a user to stop using the electric appliance and conduct fault detection.
Fig. 3 shows a schematic diagram of a second embodiment of the earth leakage protection device according to the present utility model. The difference compared to the embodiment of fig. 2 is mainly the fault detection module 106. Specifically, in the earth leakage protection device 300 of fig. 3, the fault detection module 106 includes a capacitor C8 (load module), a capacitor C1 (first current limiting module) connected in series, a resistor R3 and an ac lamp LG1 (indication module), a capacitor C3 (second current limiting module) connected in series, and a resistor R4. The capacitor C8 is coupled between the first current-carrying line 11 and the second current-carrying line 12, the resistor R3, the capacitor C1 and the ac lamp LG1 are coupled between the second current-carrying line 12 and the ground line 13, and the resistor R4 and the capacitor C3 are coupled between the first current-carrying line 11 and the ground line 13 and are coupled with the capacitor C1 and the ac lamp LG 1. The working principles of the switch module 103, the leakage detection module 104 and the monitoring module 105 are similar to those described in fig. 1, and are not described here again.
When the neutral line and the live line at the input end (such as a socket) are connected reversely, the second current carrying line 12 of the leakage protection device 300 is actually connected to the live line of the power grid, at this time, a voltage exists between the second current carrying line 12 and the ground line 13, the second current carrying line 12-R3-C1-LG 1-ground line 13 forms a current loop, the alternating current lamp LG1 is lighted, namely, a fault indication signal is sent, a wiring fault exists on the power line, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the live wire and the ground wire at the input end (such as a socket) are reversely connected or abnormally electrified, the ground wire 13 of the leakage protection device 300 is actually connected into the live wire or abnormally electrified of the power grid, at the moment, voltage exists between the second current carrying wire 12 and the ground wire 13, a current loop is formed by the second current carrying wire 12-R3-C1-LG 1-ground wire 13, the alternating current lamp LG1 is lighted, namely, a fault indication signal is sent, the power wire is indicated to have a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the zero line at the input end (such as a socket) is absent or suspended, the second current carrying line 12 of the leakage protection device 300 is in a suspended state, and at this time, the first current carrying line 11-C8-R3-C1-LG 1-ground wire 13 forms a current loop, the alternating current lamp LG1 is lightened, that is, a fault indication signal is sent out to indicate that the power line has a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the ground wire at the input end (such as a socket) is missing or suspended, the ground wire 13 of the leakage protection device 300 is in a suspended state, and at this time, the second current-carrying wire 12-R3-C1-LG 1-C3-R4-first current-carrying wire 11 forms a current loop, the alternating current lamp LG1 is lightened, that is, a fault indication signal is sent out to indicate that the power wire has a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
Fig. 4 shows a schematic diagram of a third embodiment of the earth leakage protection device according to the present utility model. Compared to the embodiment of fig. 2, the embodiment of fig. 4 mainly differs in the switching module 103, the leakage detection module 104 and the fault detection module 106. Specifically, the switch module 103 adds a switch capable of disconnecting the ground wire 13, the leakage detection module 104 does not include a shield wire, but adds a fault current detection function of the ground wire 13, and the fault detection module 106 includes a resistor R2 (load module), a capacitor C1 (first current limiting module) connected in series, a resistor R3 and a buzzer B1 (indication module), a capacitor C3 (second current limiting module) connected in series, and a resistor R4. The resistor R2 is coupled between the first current-carrying line 11 and the second current-carrying line 12, the resistor R3, the capacitor C1 and the buzzer B1 are coupled between the second current-carrying line 12 and the ground line 13, and the resistor R4 and the capacitor C3 are coupled between the first current-carrying line 11 and the ground line 13 and are coupled with the capacitor C1 and the buzzer B1.
Under the normal working condition, the first current line 11 is connected to the power grid live wire, the second current line 12 is connected to the power grid neutral wire, the ground wire 13 is connected to the power grid ground wire, the switch module 103 is in a reset state (namely a closed state), and the input ends and the output ends of the first current line 11, the second current line 12 and the ground wire 13 are connected. In this state, since there is no voltage between the second current-carrying wire 12 and the ground wire 13, no current flows in the circuit from the second current-carrying wire 12 to the ground wire 13, and the buzzer B1 does not sound. When the first current line 11 or the second current line 12 generates a leakage current or a fault current is generated in the ground line 13, that is, when the power line has a leakage current signal, the leakage detection coil CT1 generates a corresponding induced voltage, and transmits the induced voltage to the leakage detection chip IC1. When the voltage output by the leakage detection coil CT1 is greater than the threshold value, the pin 5 of the leakage detection chip IC1 outputs a high level, whereas a low level is output. The high level of the pin 5 of the leakage detection chip IC1 is provided to the control electrode of the thyristor Q1, which triggers the thyristor Q1 to conduct, so that the current in the solenoid SOL1 changes, thereby generating electromagnetic force, and the driving switch module 103 disconnects the power connection between the input terminal and the output terminal of the first current carrying line 11, the second current carrying line 12 and the ground line 13. When it is required to test whether the leakage protection device 400 works normally, the test switch of the monitoring module 105 is closed to form a current loop of the first current line 11-R1-the second current line 12, to generate an analog leakage current signal, and if the switch module 103 disconnects the power connection between the input ends and the output ends of the first current line 11, the second current line 12 and the ground wire 13, it indicates that the leakage detection module 104 works normally, otherwise, it indicates that the leakage detection module 104 fails.
When the neutral line and the live line at the input end (such as a socket) are connected reversely, the second current carrying line 12 of the leakage protection device 400 is actually connected to the live line of the power grid, at this time, voltage exists between the second current carrying line 12 and the ground line 13, the second current carrying line 12-R3-C1-B1-ground line 13 forms a current loop, the buzzer B1 is sounded, namely a fault indication signal is sent, a wiring fault exists on the power line, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the live wire and the ground wire at the input end (such as a socket) are reversely connected or abnormally electrified, the ground wire 13 of the leakage protection device 400 is actually connected into the live wire or abnormally electrified of the power grid, at the moment, voltage exists between the second current-carrying wire 12 and the ground wire 13, a current loop is formed by the second current-carrying wire 12-R3-C1-B1-ground wire 13, the buzzer B1 sounds, namely, a fault indication signal is sent, the power wire is indicated to have a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the zero line at the input end (such as a socket) is absent or suspended, the second current carrying line 12 of the leakage protection device 400 is in a suspended state, and at this time, the first current carrying line 11-R2-R3-C1-B1-ground wire 13 forms a current loop, and the buzzer B1 sounds, i.e. a fault indication signal is sent out, so as to indicate that the power line has a fault, and prompt a user to stop using the electrical appliance and perform fault detection.
When the ground wire at the input end (such as a socket) is missing or suspended, the ground wire 13 of the earth leakage protection device 400 is in a suspended state, and at this time, the second current-carrying wire 12-R3-C1-B1-C3-R4-first current-carrying wire 11 forms a current loop, and the buzzer B1 is sounded, namely, a fault indication signal is sent out to indicate that the power wire has a fault, so that a user is prompted to stop using the electric appliance and conduct fault detection.
Fig. 5 shows a schematic diagram of a fourth embodiment of the earth leakage protection device according to the present utility model. Compared to the embodiment of fig. 2, the embodiment of fig. 5 differs mainly in the switching module 103 and the leakage detection module 104. Specifically, the switch module 103 is added with a switch capable of breaking the ground wire 13, and the leakage detection module 104 does not include a shielding wire, but adds a fault current detection function of the ground wire 13, and adopts a different leakage detection chip IC1 and its peripheral circuits.
Under the normal working condition, the first current line 11 is connected to the power grid live wire, the second current line 12 is connected to the power grid neutral wire, the ground wire 13 is connected to the power grid ground wire, the switch module 103 is in a reset state (namely a closed state), and the input ends and the output ends of the first current line 11, the second current line 12 and the ground wire 13 are connected. In this state, there is no voltage between the second current-carrying line 12 and the ground line 13, so that no current flows in the loop from the second current-carrying line 12 to the ground line 13, and the light-emitting diode LED1 is not lit. When the first current line 11 or the second current line 12 generates a leakage current or a fault current is generated in the ground line 13, that is, when the power line has a leakage current signal, the leakage detection coil CT1 generates a corresponding induced voltage, and transmits the induced voltage to the leakage detection chip IC1. When the voltage output by the leakage detection coil CT1 is greater than the threshold value, the pin 5 of the leakage detection chip IC1 outputs a high level, whereas a low level is output. The high level of the pin 5 of the leakage detection chip IC1 is provided to the control electrode of the thyristor Q1, which triggers the thyristor Q1 to conduct, so that the current in the solenoid SOL1 changes, thereby generating electromagnetic force, and the driving switch module 103 disconnects the power connection between the input terminal and the output terminal of the first current carrying line 11, the second current carrying line 12 and the ground line 13. When it is required to test whether the leakage protection device 500 works normally, the test switch of the monitoring module 105 is closed to form a current loop of the first current line 11-R1-the second current line 12, to generate an analog leakage current signal, and if the switch module 103 disconnects the power connection between the input ends and the output ends of the first current line 11, the second current line 12 and the ground wire 13, it indicates that the leakage detection module 104 works normally, otherwise, it indicates that the leakage detection module 104 fails.
When the neutral line and the live line at the input end (such as a socket) are connected reversely, the second current carrying line 12 of the leakage protection device 500 is actually connected to the live line of the power grid, at this time, a voltage exists between the second current carrying line 12 and the ground line 13, the second current carrying line 12-R3-C1-LED 1-ground line 13 forms a current loop, the light emitting diode LED1 is lighted, namely, a fault indication signal is sent, a wiring fault exists on the power line, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the live wire and the ground wire at the input end (such as a socket) are reversely connected or abnormally electrified, the ground wire 13 of the leakage protection device 500 is actually connected into the live wire or abnormally electrified of the power grid, at the moment, voltage exists between the second current-carrying wire 12 and the ground wire 13, a current loop is formed by the second current-carrying wire 12-R3-C1-LED 1-ground wire 13, the light-emitting diode LED1 is lighted, namely, a fault indication signal is sent, the power wire is indicated to have a fault, and a user is prompted to stop using the electric appliance and conduct fault detection.
When the zero line at the input end (such as a socket) is absent or suspended, the second current carrying line 12 of the leakage protection device 500 is in a suspended state, and at this time, the first current carrying line 11-R2-R3-C1-LED 1-ground wire 13 forms a current loop, and the light emitting diode LED1 is lightened, that is, a fault indication signal is sent out to indicate that the power line has a fault, so that a user is prompted to stop using the electrical appliance and conduct fault detection.
When the ground wire at the input end (such as a socket) is missing or suspended, the ground wire 13 of the leakage protection device 500 is in a suspended state, and at this time, the second current-carrying wire 12-R3-C1-LED 1-C3-R4-first current-carrying wire 11 forms a current loop, and the light-emitting diode LED1 is lightened, that is, a fault indication signal is sent out to indicate that the power wire has a fault, so as to prompt a user to stop using the electric appliance and conduct fault detection.
A second aspect of the present utility model proposes an electrical connection device comprising: a housing; and a leakage protection device according to any one of the above embodiments, the leakage protection device being accommodated in the housing.
A third aspect of the present utility model proposes an electrical appliance comprising: a load device; and an electrical connection device coupled between the power line and the load device for providing power to the load device, the electrical connection device comprising the earth leakage protection apparatus of any of the above embodiments.
Therefore, while the present utility model has been described with reference to specific examples, which are intended to be illustrative only and not to be limiting of the utility model, 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 utility model.
Claims (9)
1. An earth leakage protection device, characterized in that it comprises:
a switching module coupled between an input and an output of a power line and configured to control a power connection between the input and the output;
a leakage detection module configured to detect a leakage current signal on the power line and to drive the switching module to disconnect the power connection when the leakage current signal is detected;
the monitoring module is configured to generate the simulated leakage current signal so as to detect whether the leakage current detection module works normally or not; and
a fault detection module configured to detect a wiring fault of the power line and to issue a fault indication signal to indicate a fault condition upon detection of the wiring fault of the power line.
2. The earth leakage protection device according to claim 1, characterized in that the power supply line comprises a first current carrying line for connection to a grid live line, a second current carrying line for connection to a grid neutral line and a ground line for connection to a grid ground line, the wiring fault of the power supply line comprises the second current carrying line being missing or floating, and the fault detection module comprises:
a load module coupled between the first current carrying line and the second current carrying line and configured to provide a current loop between the first current carrying line and the second current carrying line;
a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located; and
an indication module coupled in series with the first current limiting module and between the second current carrying line and the ground line and configured to issue the fault indication signal when the second current carrying line is missing or floating.
3. The leakage protection device of claim 2, wherein the load module comprises at least one of a resistor, a capacitor, and an inductor, the first current limiting module comprises at least one of a capacitor and a resistor, and the indication module comprises at least one of an indicator light, a buzzer, and a speaker.
4. The earth leakage protection device of claim 1, wherein the power line comprises a first current carrying line for connection to a grid hot line, a second current carrying line for connection to a grid neutral line, and a ground line for connection to a grid ground line, wherein the wiring fault of the power line comprises the ground line being missing or floating, and wherein the fault detection module comprises:
a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located;
a second current limiting module coupled between the first current carrying line and the ground line and configured to limit a current in a loop in which the second current limiting module is located; and
an indication module is connected in series with the first current limiting module and coupled between the second current carrying line and the ground line, and is configured to emit the fault indication signal when the ground line is missing or floating.
5. The leakage protection device of claim 4, wherein the first current limiting module and the second current limiting module each comprise at least one of a capacitance and a resistance, and the indication module comprises at least one of an indicator light, a buzzer, and a speaker.
6. The earth leakage protection device of claim 1, wherein the power line includes a first current carrying line for connection to a grid hot line, a second current carrying line for connection to a grid neutral line, and a ground line for connection to a grid ground line, the wiring fault of the power line includes at least one of the second current carrying line being absent or floating, the ground line being absent or floating, the first and second current carrying lines being connected in reverse, the second and ground line being connected in reverse, and the ground line being abnormally charged, and the fault detection module includes:
a load module coupled between the first current carrying line and the second current carrying line and configured to provide a current loop between the first current carrying line and the second current carrying line;
a first current limiting module coupled between the second current carrying line and the ground line and configured to limit a current in a loop in which the first current limiting module is located;
a second current limiting module coupled between the first current carrying line and the ground line and configured to limit a current in a loop in which the second current limiting module is located; and
an indication module connected in series with the first current limiting module and coupled between the second current carrying line and the ground line and configured to issue the fault indication signal when the wiring fault occurs in the power line.
7. The leakage protection device of claim 6, wherein the load module comprises at least one of a resistor, a capacitor, and an inductance, the first current limiting module and the second current limiting module comprise at least one of a capacitor and a resistor, respectively, and the indication module comprises at least one of an indicator light, a buzzer, and a speaker.
8. An electrical connection apparatus, the electrical connection apparatus comprising:
a housing; and
the earth leakage protection device of any one of claims 1-7, the earth leakage protection device being housed in the housing.
9. An electrical appliance, the electrical appliance comprising:
a load device;
an electrical connection device coupled between a power cord and the load device for powering the load device, wherein the electrical connection device comprises the earth leakage protection apparatus according to any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382182.2U CN219018452U (en) | 2022-12-16 | 2022-12-16 | Leakage protection device, electric connection equipment and electric appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223382182.2U CN219018452U (en) | 2022-12-16 | 2022-12-16 | Leakage protection device, electric connection equipment and electric appliance |
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| Publication Number | Publication Date |
|---|---|
| CN219018452U true CN219018452U (en) | 2023-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223382182.2U Active CN219018452U (en) | 2022-12-16 | 2022-12-16 | Leakage protection device, electric connection equipment and electric appliance |
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| Country | Link |
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| CN (1) | CN219018452U (en) |
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