CN217036737U - Leakage protector - Google Patents
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- CN217036737U CN217036737U CN202220770872.6U CN202220770872U CN217036737U CN 217036737 U CN217036737 U CN 217036737U CN 202220770872 U CN202220770872 U CN 202220770872U CN 217036737 U CN217036737 U CN 217036737U
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Abstract
The utility model provides a leakage protector, wherein the input end of a test module is connected with a line to be tested, the output end of the test module is connected with the first input end of a current mutual inductance module, and the test module comprises: the device comprises a variable resistor, a test switch and a test circuit board, wherein one end of the variable resistor is connected with an L-phase line of a line to be detected, and the other end of the variable resistor is connected with one end of the test switch; the other end of the test switch is connected with the first end of the test circuit board; the second end of the test circuit board is connected with the first input end of the current mutual inductance module and then grounded; the input of self-checking module is connected with control module's first output, and the output is connected with the second input of the mutual inductance module of electric current, and the self-checking module includes: and the control end of the self-checking switch is connected with the first output end of the control module, the first end of the self-checking switch is connected with the first end of the test circuit board, and the second end of the self-checking switch is grounded. By implementing the utility model, the circuit structure is simplified, and the manufacturing cost and the maintenance difficulty are reduced.
Description
Technical Field
The utility model relates to the technical field of leakage protection, in particular to a leakage protector.
Background
The increasing popularization of household appliances brings great convenience to our lives and brings great dangers to people, for example, when the problems of electric leakage, overload, short circuit and the like occur to a circuit, the electric appliances are easy to damage, and even an electric fire hazard is caused to harm personal safety. The earth leakage protector is used as equipment for protecting the life and property safety of people in a power distribution system, and can quickly cut off a power supply when the danger of electric leakage occurs, so that people can safely use electricity, and unnecessary loss is avoided. However, the existing leakage protector has a complex circuit structure, so that the manufacturing cost is increased, and the overhauling difficulty is increased.
SUMMERY OF THE UTILITY MODEL
Therefore, the technical problem to be solved by the present invention is to overcome the defect of complex circuit structure of the leakage protector in the prior art, thereby providing a leakage protector.
In order to achieve the purpose, the utility model provides the following technical scheme:
an embodiment of the present invention provides a leakage protector, including: the mutual inductance current testing device comprises a mutual inductance current module, a testing module, a self-checking module, a control module and a tripping module, wherein the mutual inductance current module is connected with a line to be tested, the input end of the testing module is connected with the line to be tested, the output end of the testing module is connected with a first input end of the mutual inductance current module, and the testing module comprises: the circuit comprises a variable resistor, a test switch and a test circuit board, wherein one end of the variable resistor is connected with an L-phase line of a circuit to be detected, and the other end of the variable resistor is connected with one end of the test switch; the other end of the test switch is connected with the first end of the test circuit board; the second end of the test circuit board is connected with the first input end of the current mutual inductance module and then grounded;
the input end of the self-checking module is connected with the first output end of the control module, the output end of the self-checking module is connected with the second input end of the current mutual inductance module, and the self-checking module comprises: the control end of the self-checking switch is connected with the first output end of the control module, the first end of the self-checking switch is connected with the first end of the test circuit board, and the second end of the self-checking switch is grounded;
the third input end of the current mutual inductance module is connected with a line to be detected, and the output end of the current mutual inductance module is connected with the input end of the control module;
and the second output end of the control module is connected with the input end of the tripping module.
Optionally, the control module comprises: the leakage protection circuit comprises a leakage protection circuit and a microcontroller, wherein the output end of the leakage protection circuit is connected with the first input end of the microcontroller.
Optionally, the trip module comprises: the driving circuit comprises a driving circuit and a coil attracting circuit, wherein a first input end of the driving circuit is connected with a first output end of the microcontroller, and a first output end of the driving circuit is connected with the coil attracting circuit.
Optionally, the driving circuit comprises: the microcontroller comprises a third capacitor, a second controllable switch, a second resistor, a second capacitor, a third controllable switch and a third resistor, wherein one end of the third capacitor is connected with a first output end of the microcontroller, the other end of the third capacitor is connected with a control end of the second controllable switch, a first end of the second controllable switch is respectively connected with one end of the second resistor, one end of the second capacitor and a control end of the third controllable switch, the other end of the second resistor is externally connected with an external power supply, a second end of the second controllable switch is respectively connected with the other end of the second capacitor and the second end of the third controllable switch and is grounded, the first end of the third controllable switch is connected with one end of the third resistor, and the other end of the third resistor is externally connected with the external power supply.
Optionally, the coil pull-in circuit includes: the relay comprises a relay and a first capacitor, wherein one end of a coil of the relay is respectively connected with one end of the first capacitor and one end of the third resistor, the other end of the coil of the relay is connected with the second end of the third controllable switch and then grounded, and the other end of the first capacitor is grounded.
Optionally, the earth-leakage protector further comprises: and the input end of the first power supply module is connected with the line to be detected, and the output end of the first power supply module is connected with the tripping module and used for providing power for the tripping module.
Optionally, the earth leakage protector further comprises: and the input end of the second power supply module is connected with the line to be detected, and the output end of the second power supply module is connected with the control module and used for providing power supply for the control module.
Optionally, the first power module includes: a fourth resistor, a fifth capacitor and a rectifier, wherein,
one end of the fourth resistor is connected with an L-phase line of the line to be detected, the other end of the fourth resistor is connected with one end of the fifth capacitor, the other end of the fifth capacitor is connected with the first end of the rectifier, the second end of the rectifier is connected with one end of the coil of the relay, the third end of the rectifier is connected with an N-phase line of the line to be detected, and the fourth end of the rectifier is grounded.
Optionally, the self-checking switch is a controllable switch, and the controllable switch is an IGBT device or an MOS transistor.
Optionally, the second controllable switch and the third controllable switch are insulated gate field effect transistors or triodes.
The technical scheme of the utility model has the following advantages:
the utility model provides a leakage protector, comprising: mutual inductance module of electric current, test module, self-checking module, control module and dropout module with the circuit connection that awaits measuring, wherein, test module's input and the circuit connection that awaits measuring, the output is connected with the first input of the mutual inductance module of electric current, and test module includes: the device comprises a variable resistor, a test switch and a test circuit board, wherein one end of the variable resistor is connected with an L-phase line of a line to be detected, and the other end of the variable resistor is connected with one end of the test switch; the other end of the test switch is connected with the first end of the test circuit board; the second end of the test circuit board is connected with the first input end of the current mutual inductance module and then grounded; the input of self-checking module is connected with control module's first output, and the output is connected with the second input of the mutual inductance module of electric current, and the self-checking module includes: the control end of the self-checking switch is connected with the first output end of the control module, the first end of the self-checking switch is connected with the first end of the test circuit board, and the second end of the self-checking switch is grounded; the third input end of the current mutual inductance module is connected with the line to be detected, and the output end of the current mutual inductance module is connected with the input end of the control module; and the second output end of the control module is connected with the input end of the tripping module. The test circuit board is connected with the test switch and the self-checking switch respectively, no additional lead is needed in a test loop, two test modes of testing the leakage protector and simulating the repeated grounding fault state of the neutral line can be realized by using one test circuit board, the circuit structure is simplified, and the manufacturing cost and the overhauling difficulty are reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic block diagram of a specific example of a leakage protector in an embodiment of the present invention;
fig. 2 is a circuit diagram of a specific example of the earth leakage protector in the embodiment of the present invention;
fig. 3 is a circuit diagram of another specific example of the earth-leakage protector in the embodiment of the utility model;
fig. 4 is a schematic block diagram of another specific example of the earth-leakage protector in the embodiment of the utility model;
fig. 5 is a circuit diagram of a specific example of the first power supply module in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the switch or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a leakage protector which can be used for line leakage protection, can quickly cut off a power supply when a leakage danger occurs, and prevents accidents caused by personal electric shock and leakage. As shown in fig. 1, the earth leakage protector includes: the device comprises a current mutual inductance module 1, a test module 2, a self-checking module 3, a control module 4 and a tripping module 5 which are connected with a line to be tested, wherein the input end of the test module 2 is connected with the line to be tested, and the output end of the test module is connected with a first input end of the current mutual inductance module 1; the input end of the self-checking module 3 is connected with the first output end of the control module 4, and the output end of the self-checking module is connected with the second input end of the current mutual inductance module 1; the third input end of the current mutual inductance module 1 is connected with a line to be detected, and the output end of the current mutual inductance module 1 is connected with the input end of the control module 4; a second output of the control module 4 is connected to an input of the trip module 5.
In one embodiment, as shown in fig. 2, the current transformer module 1 includes: current transformer CT1 and current transformer CT 2. The control module 4 includes: the circuit comprises a leakage protection circuit 41 and a microcontroller 42, wherein the output end of the leakage protection circuit 41 is connected with the first input end of the microcontroller 42. The current transformers CT1 and CT2 are used for detecting whether a residual current exists in the line, and the residual current at this time may be a residual current generated when the line to be detected has a fault, a residual current generated by a test of the test module 2, or a residual current generated by a self-test of the self-test module 3. The residual current is compared with a preset residual current value through a comparison circuit inside the leakage protection circuit 41, when the current residual current is larger than the preset residual current value, the leakage protection circuit 41 generates a leakage signal and sends the leakage signal to the microcontroller 42, the microcontroller 42 generates a tripping signal according to the leakage signal, and the tripping module 5 controls tripping according to the tripping signal to cut off a circuit to be detected. The processes of generating the leakage signal by the leakage protection circuit 41 and generating the trip signal by the microcontroller 42 are the prior art, and are not described herein again.
In the embodiment of the present invention, as shown in fig. 2, the test module 2 includes: the testing device comprises a variable resistor RT, a testing switch TEST and a testing circuit board, wherein one end of the variable resistor RT is connected with an L-phase line of a circuit to be tested, and the other end of the variable resistor RT is connected with one end of the testing switch TEST; the other end of the TEST switch TEST is connected with the first end of the TEST circuit board; the second end of the test circuit board, which is not shown in fig. 2, is connected to the first input end of the current transformer module 1 and then grounded. Specifically, a TEST wire penetrating through a current transformer CT1 and a current transformer CT2 is welded on the TEST circuit board, the two ends of the TEST wire are respectively X1 and X2, wherein one end of a variable resistor RT is connected with an L-phase line of a circuit to be tested, and the other end of the variable resistor RT is connected with one end of a TEST switch TEST; the other end of the TEST switch TEST is connected with the end of a TEST line X1, and the end of the TEST line X2 is grounded. When the TEST switch TEST is turned on, the TEST wire passing through the current transformers CT1 and CT2 can generate residual current, the current transformers CT1 and CT2 send the detected residual current to the control module 4, the residual current is compared with the preset residual current value through the comparison circuit inside the leakage protection circuit 41, when the current residual current is larger than the preset residual current value, the leakage protection circuit 41 generates a leakage signal and sends the leakage signal to the microcontroller 42, the microcontroller 42 generates a trip signal according to the leakage signal, and the trip module 5 controls tripping according to the trip signal to cut off the circuit to be detected.
In the embodiment of the present invention, as shown in fig. 2, the self-test module 3 includes: and the control end of the self-checking switch Q3 and the control end of the self-checking switch Q3 are connected with the first output end of the control module 4, the first end of the self-checking switch Q3 is connected with the first end of the test circuit board, and the second end of the self-checking switch Q3 is grounded. Specifically, the control terminal of the self-checking switch Q3 is connected to the output terminal of the microcontroller 42, the first terminal is connected to the terminal X1, and the second terminal is grounded. When the neutral line repeated ground fault state needs to be simulated, the microcontroller 42 sends a conducting signal to the control end of the self-checking switch Q3, the self-checking switch Q3 is triggered to be conducted, a test line penetrating through the current transformers CT1 and CT2 can generate residual current, the current transformers CT1 and CT2 send the detected residual current to the control module 4, the residual current is compared with a preset residual current value through a comparison circuit inside the leakage protection circuit 41, when the current residual current is larger than the preset residual current value, the leakage protection circuit 41 generates a leakage signal and sends the leakage signal to the microcontroller 42, the microcontroller 42 generates a tripping signal according to the leakage signal, and the tripping module 5 controls tripping according to the tripping signal to cut off a circuit to be detected. The self-checking switch Q3 is a controllable switch, and the controllable switch is an IGBT device or an MOS transistor. According to the specific structure of the test module 2 and the self-checking module 3, one test wire welded on the circuit board is respectively connected with the test switch and the self-checking switch, two test modes of testing the leakage protector and simulating the repeated grounding fault state of the neutral wire can be realized by using one test wire, and the circuit structure is simplified.
The utility model provides a leakage protector, comprising: mutual inductance module of electric current, test module, self-checking module, control module and the dropout module of being connected with the circuit that awaits measuring, wherein, test module's input and the line connection that awaits measuring, the output is connected with the first input of the mutual inductance module of electric current, and test module includes: the device comprises a variable resistor, a test switch and a test circuit board, wherein one end of the variable resistor is connected with an L-phase line of a line to be detected, and the other end of the variable resistor is connected with one end of the test switch; the other end of the test switch is connected with the first end of the test circuit board; the second end of the test circuit board is connected with the first input end of the current mutual inductance module and then grounded; the input of self-checking module is connected with control module's first output, and the output is connected with the second input of the mutual inductance module of electric current, and the self-checking module includes: the control end of the self-checking switch is connected with the first output end of the control module, the first end of the self-checking switch is connected with the first end of the test circuit board, and the second end of the self-checking switch is grounded; the third input end of the current mutual inductance module is connected with the line to be detected, and the output end of the current mutual inductance module is connected with the input end of the control module; and the second output end of the control module is connected with the input end of the tripping module. The test circuit board is connected with the test switch and the self-checking switch respectively, no additional lead is needed in a test loop, two test modes of testing the leakage protector and simulating the repeated grounding fault state of the neutral line can be realized by using one test circuit board, the circuit structure is simplified, and the manufacturing cost and the overhauling difficulty are reduced.
In one embodiment, as shown in fig. 2, the trip module 5 includes: a driving circuit 51 and a coil attracting circuit 52, wherein a first input end of the driving circuit 51 is connected with a first output end of the microcontroller 42, and a first output end of the driving circuit 51 is connected with the coil attracting circuit 52.
In a specific embodiment, as shown in fig. 2, after the control module 4 receives a residual current generated when a fault occurs in the line to be detected, or a residual current generated by the test module 2 through testing, or a residual current generated by the self-checking module 3 through self-checking, the control module 4 generates a trip signal and sends the trip signal to the driving circuit 51, and the driving circuit 51 drives the coil attracting circuit 52 to act according to the received trip signal, so as to disconnect the knife switch connected to the line to be detected, so as to cut off the line to be detected.
In one embodiment, as shown in fig. 3, the driving circuit 51 includes: the microcontroller comprises a third capacitor C3, a second controllable switch Q2, a second resistor R2, a fourth capacitor C4, a third controllable switch Q3 and a third resistor R3, wherein one end of the third capacitor C3 is connected with a first output end of the microcontroller 42, the other end of the third capacitor C3 is connected with a control end of the second controllable switch Q2, a first end of the second controllable switch Q2 is respectively connected with one end of the second resistor R2, one end of the fourth capacitor C4 and a control end of the third controllable switch Q3, the other end of the second resistor R2 is externally connected with an external power supply, a second end of the second controllable switch Q2 is respectively connected with the other end of the fourth capacitor C4 and the second end of the third controllable switch Q3 and grounded, the first end of the third controllable switch Q3 is connected with one end of the third resistor R3, and the other end of the third resistor R3 is externally connected with the external power supply.
In one embodiment, as shown in FIG. 3, the coil pull-in circuit 52 includes: the relay K1 and the first electric capacity C1, wherein, relay K1's coil one end is connected with the one end of first electric capacity C1 and the one end of third resistance R3 respectively, and the other end of relay K1's coil is grounded after being connected with the second end of third controllable switch Q3, and the other end of first electric capacity C1 is grounded.
In one embodiment, the second controllable switch Q2 and the third controllable switch Q3 are insulated gate fets or transistors. The coil of the relay K1 is a solenoid. When the current transformer module 1 does not detect a residual current signal (i.e., when the circuit works normally), the microcontroller 42 outputs a PWM signal to the control end of the second controllable switch Q2 through the third capacitor C3, so that the second controllable switch Q2 is turned on intermittently at a high frequency, the voltage at the two ends of the fourth capacitor C4 is continuously discharged to the ground, the low-voltage state at the two ends of the fourth capacitor C4 is maintained, the third controllable switch Q3 is kept in an off state, a power supply loop is provided for the solenoid, power is supplied to the solenoid through an external power supply, and after the solenoid is electrified, a switch connected to a line to be detected is closed to switch on the line to be detected. When the current transformer module 1 detects a residual current signal, the residual current is compared with a preset residual current value through a comparison circuit inside the leakage protection circuit 41, when the current residual current is greater than the preset residual current value, the leakage protection circuit 41 generates a leakage signal and sends the leakage signal to the microcontroller 42, the microcontroller 42 generates a trip signal according to the leakage signal, and stops outputting a PWM signal to the control end of the second controllable switch Q2, so that the second controllable switch Q2 is kept in a cut-off state. Because the second controllable switch Q2 is not turned on, the external power source can charge the fourth capacitor C4 through the second resistor R2, when the voltage across the fourth capacitor C4 reaches a preset voltage value, the third controllable switch Q3 is triggered to be turned on, the voltage across the first capacitor C1 is discharged to the ground through the third resistor R3 and the third controllable switch Q3, the solenoid is tripped due to voltage loss, and the line to be detected is cut off.
Specifically, since whether the earth leakage protector is operated or not is controlled by the microcontroller 42, if the microcontroller 42 stops the internal clock due to old age or damage, the microcontroller 42 stops outputting the PWM signal to the control terminal of the second controllable switch Q2, even if the output of the microcontroller 42 keeps a high level, the second controllable switch Q2 is rapidly turned off by the dc blocking function of the third capacitor C3, and the external power source can charge the fourth capacitor C4 through the second resistor R2, thereby triggering the third controllable switch Q3 to be turned on. The voltage at the two ends of the first capacitor C1 is discharged to the ground through the third resistor R3 and the third controllable switch Q3, the solenoid is tripped due to voltage loss, and a line to be detected is cut off. Therefore, the leakage protector can not only cut off the line to be detected when the line leaks electricity to play a role of leakage protection, but also directly cut off the line to be detected when the internal clock of the microcontroller 42 stops, so as to prevent the microcontroller 42 from failing to act and failing to play a role of protection when the internal fault occurs the leakage electricity.
In one embodiment, as shown in fig. 4, the earth-leakage protector further includes: and the input end of the first power supply module 7 is connected with the line to be detected, and the output end of the first power supply module 7 is connected with the tripping module 5 and used for supplying power to the tripping module 5.
In one embodiment, as shown in fig. 5, the first power module 7 includes: the circuit comprises a fourth resistor R4, a fifth capacitor C5 and a rectifier D1, wherein one end of the fourth resistor R4 is connected with an L-phase line of the line to be detected, the other end of the fourth resistor R4 is connected with one end of the fifth capacitor C5, the other end of the fifth capacitor C5 is connected with a first end of the rectifier D1, a second end of the rectifier D1 is connected with one end of a coil of the relay K1 to form an output power supply V1, a third end of the rectifier D1 is connected with an N-phase line of the line to be detected, and a fourth end of the rectifier D1 is grounded. In the embodiment of the utility model, the two ends of the L-phase line and the N-phase line of the line to be detected form a first power module 7 in a resistance-capacitance voltage reduction and full-wave rectification mode to supply power for the spiral tube.
In one embodiment, as shown in fig. 4, the leakage protector further includes: and the input end of the second power supply module 8 is connected with the line to be detected, and the output end of the second power supply module 8 is connected with the control module 4 and used for supplying power to the control module 4.
In an embodiment, as shown in fig. 2, an input end of the second power module 8 is connected to the line to be detected, and an output end thereof is connected to the leakage protection circuit 41 and the microcontroller 42, respectively, for providing power to the leakage protection circuit 41 and the microcontroller 42. By arranging two power supplies, mutual interference of two power supplies is avoided.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the spirit or scope of the utility model.
Claims (10)
1. A leakage protector comprising: with the mutual inductance module of electric current of awaiting measuring the line connection, its characterized in that, earth-leakage protector still includes: a test module, a self-checking module, a control module and a tripping module, wherein,
the input of test module is connected with the circuit that awaits measuring, the output with the first input of the mutual inductance module of electric current is connected, test module includes: the device comprises a variable resistor, a test switch and a test circuit board, wherein one end of the variable resistor is connected with an L-phase line of a line to be detected, and the other end of the variable resistor is connected with one end of the test switch; the other end of the test switch is connected with the first end of the test circuit board; the second end of the test circuit board is connected with the first input end of the current mutual inductance module and then grounded;
the input end of the self-checking module is connected with the first output end of the control module, the output end of the self-checking module is connected with the second input end of the current mutual inductance module, and the self-checking module comprises: the control end of the self-checking switch is connected with the first output end of the control module, the first end of the self-checking switch is connected with the first end of the test circuit board, and the second end of the self-checking switch is grounded;
the third input end of the current mutual inductance module is connected with a line to be detected, and the output end of the current mutual inductance module is connected with the input end of the control module;
and the second output end of the control module is connected with the input end of the tripping module.
2. A earth-leakage protector according to claim 1, characterized in that the control module comprises: the leakage protection circuit comprises a leakage protection circuit and a microcontroller, wherein the output end of the leakage protection circuit is connected with the first input end of the microcontroller.
3. A leakage protector according to claim 2, characterized in that the trip module comprises: the driving circuit comprises a driving circuit and a coil attracting circuit, wherein a first input end of the driving circuit is connected with a first output end of the microcontroller, and a first output end of the driving circuit is connected with the coil attracting circuit.
4. A leakage protector according to claim 3, characterized in that the driving circuit comprises: the power supply comprises a third capacitor, a second controllable switch, a second resistor, a second capacitor, a third controllable switch and a third resistor, wherein one end of the third capacitor is connected with a first output end of the microcontroller, the other end of the third capacitor is connected with a control end of the second controllable switch, a first end of the second controllable switch is respectively connected with one end of the second resistor, one end of the second capacitor and a control end of the third controllable switch, the other end of the second resistor is externally connected with an external power supply, a second end of the second controllable switch is respectively connected with the other end of the second capacitor and a second end of the third controllable switch and is grounded, the first end of the third controllable switch is connected with one end of the third resistor, and the other end of the third resistor is externally connected with the external power supply.
5. A leakage protector according to claim 4, characterized in that the coil pull-in circuit comprises: the relay comprises a relay and a first capacitor, wherein one end of a coil of the relay is respectively connected with one end of the first capacitor and one end of the third resistor, the other end of the coil of the relay is connected with the second end of the third controllable switch and then grounded, and the other end of the first capacitor is grounded.
6. A leakage protector according to claim 5, characterized in that it further comprises: the input end of the first power supply module is connected with the line to be detected, and the output end of the first power supply module is connected with the tripping module and used for supplying power to the tripping module.
7. A earth-leakage protector according to claim 1, further comprising: and the input end of the second power supply module is connected with the line to be detected, and the output end of the second power supply module is connected with the control module and used for supplying power to the control module.
8. A earth-leakage protector according to claim 6, characterized in that the first power supply module comprises: a fourth resistor, a fifth capacitor and a rectifier, wherein,
one end of the fourth resistor is connected with an L-phase line of the line to be detected, the other end of the fourth resistor is connected with one end of the fifth capacitor, the other end of the fifth capacitor is connected with the first end of the rectifier, the second end of the rectifier is connected with one end of the coil of the relay, the third end of the rectifier is connected with an N-phase line of the line to be detected, and the fourth end of the rectifier is grounded.
9. A earth-leakage protector according to claim 1, characterized in that the self-checking switch is a controllable switch, and the controllable switch is an IGBT device or an MOS transistor.
10. A leakage protector according to claim 4, wherein the second controllable switch and the third controllable switch are insulated gate FETs or triodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220770872.6U CN217036737U (en) | 2022-03-31 | 2022-03-31 | Leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220770872.6U CN217036737U (en) | 2022-03-31 | 2022-03-31 | Leakage protector |
Publications (1)
| Publication Number | Publication Date |
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| CN217036737U true CN217036737U (en) | 2022-07-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220770872.6U Active CN217036737U (en) | 2022-03-31 | 2022-03-31 | Leakage protector |
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| CN (1) | CN217036737U (en) |
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- 2022-03-31 CN CN202220770872.6U patent/CN217036737U/en active Active
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