CN220209951U - Leakage protection circuit and leakage protector - Google Patents
Leakage protection circuit and leakage protector Download PDFInfo
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- CN220209951U CN220209951U CN202321285376.2U CN202321285376U CN220209951U CN 220209951 U CN220209951 U CN 220209951U CN 202321285376 U CN202321285376 U CN 202321285376U CN 220209951 U CN220209951 U CN 220209951U
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Abstract
The utility model provides a leakage protection circuit and a leakage protector, wherein the leakage protection circuit comprises: the self-checking device comprises a power circuit module, a tripping circuit module, a self-checking module, an alarm circuit module and a leakage detection module, wherein the power circuit module is connected with the tripping circuit module, the self-checking module, the alarm circuit module and the leakage detection module respectively, the alarm circuit module is connected with the self-checking module, the self-checking module is connected with the tripping circuit module and the leakage detection module, the power circuit module is used for supplying power to the tripping circuit module, the self-checking module, the alarm circuit module and the leakage detection module, the self-checking module is used for detecting whether the leakage protection function is normal or not, the leakage detection module is used for detecting whether the leakage protection circuit is leaked or not, the tripping circuit module is used for tripping when the leakage is caused, and the alarm circuit module is used for alarming when the leakage protection function of the circuit is invalid.
Description
Technical Field
The utility model relates to the field of electrical safety, in particular to a leakage protection circuit and a leakage protector.
Background
The leakage protector has overload and short-circuit protection functions and is important for electricity safety. However, the existing leakage protector needs to be manually checked periodically to determine whether the function is normal, and when the user does not manually check according to a specified period, the user cannot timely find the abnormality of the leakage protector, so that potential safety hazards are generated. Therefore, how to prompt the user when the function of the leakage protector is abnormal becomes a technical problem to be solved at present.
Disclosure of Invention
In view of the above problems, an object of the present utility model is to provide a leakage protection circuit and a leakage protector, which detect whether a leakage protection function operates normally or not, and alarm when the leakage protection function fails, so as to prompt a user in time when the leakage protection function is abnormal, and specifically, the following scheme is adopted:
in a first aspect, an embodiment of the present utility model provides a leakage protection circuit, which is characterized in that the leakage protection circuit includes:
the device comprises a power supply circuit module, a tripping circuit module, a self-checking module, an alarm circuit module and a leakage detection module;
the power supply circuit module is respectively connected with the tripping circuit module, the self-checking module, the alarm circuit module and the electric leakage detection module;
the alarm circuit module is connected with the self-checking module;
the self-checking module is connected with the tripping circuit module and the electric leakage detection module;
the power supply circuit module is used for supplying power to the tripping circuit module, the self-checking module, the alarm circuit module and the electric leakage detection module;
the leakage detection module is used for detecting whether the leakage protection circuit leaks electricity or not;
the tripping circuit module is used for tripping when electric leakage occurs;
the self-checking module is used for detecting whether the leakage protection function is normal or not;
the alarm circuit module is used for alarming when the leakage protection function fails.
Optionally, the leakage detection module includes:
the transformer, the first resistor, the second resistor, the third resistor and the first capacitor;
the first output port of the transformer is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the second resistor is connected with one end of the first capacitor;
the second output port of the mutual inductor is respectively connected with the other end of the first resistor and one end of the third resistor;
the other end of the third resistor is connected with the other end of the first capacitor;
and two ends of the first capacitor are connected with the self-checking module.
Optionally, the self-checking module includes:
the circuit comprises a chip, a first diode, a second diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first triode, a second capacitor and a third capacitor;
the first pin of the chip is connected with the electric leakage detection module;
the second pin of the chip is connected with the electric leakage detection module;
the third pin of the chip is connected with the cathode of the second capacitor; the third pin of the chip is grounded;
the third pin of the chip is connected with the fourth pin of the chip;
the anode of the second capacitor is respectively connected with one end of the fourth resistor and the eighth pin of the chip;
the other end of the fourth resistor is connected with one end of the fifth resistor;
the other end of the fifth resistor is respectively connected with the power supply circuit module and the alarm circuit module;
the sixth pin of the chip is respectively connected with one end of the sixth resistor and the anode of the first diode;
the cathode of the first diode is respectively connected with the sixth resistor and the tripping circuit module;
the ninth pin of the chip is connected with one end of the third capacitor;
the tenth pin of the chip is respectively connected with the other end of the third capacitor and one end of the seventh resistor;
the other end of the seventh resistor is connected with the collector electrode of the first triode;
the emitter electrode of the first triode is grounded;
the base electrode of the first triode is connected with one end of the eighth resistor;
the other end of the eighth resistor is respectively connected with one end of the tenth resistor and a fifteenth pin of the chip;
the anode of the second diode is connected with the power circuit module;
the cathode of the second diode is connected with one end of the ninth resistor;
the other end of the ninth resistor is connected with the collector electrode of the second triode;
the emitter electrode of the second triode is grounded;
and the base electrode of the second triode is connected with the other end of the tenth resistor.
Optionally, the trip circuit module includes:
the trip, the third diode, the fourth diode, the eleventh resistor, the fourth capacitor and the fifth capacitor;
one end of the release is connected with the power circuit module;
the other end of the release is connected with the anode of the third diode;
the cathode of the third diode is connected with the anodes of the self-checking module and the fourth diode respectively;
the cathode of the fourth diode is connected with one end of the fourth capacitor; the cathode of the fourth diode is grounded;
one end of the fourth capacitor is connected with one end of the eleventh resistor;
the other end of the eleventh resistor is connected with the self-checking module;
the other end of the fourth capacitor is connected with one end of the fifth capacitor; the other end of the fourth capacitor is grounded;
the other end of the fifth capacitor is connected with the self-checking module.
Optionally, the alarm circuit module includes:
a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a buzzer, a fifth diode, a third triode and a sixth capacitor;
one end of the twelfth resistor is connected with the power circuit module;
the other end of the twelfth resistor is connected with one end of the thirteenth resistor;
the other end of the thirteenth resistor is connected with the anode of the buzzer;
the cathode of the buzzer is connected with the collector of the third triode;
the base electrode of the third triode is connected with one end of the sixth capacitor;
the emitter of the third triode is connected with the other end of the sixth capacitor; the emitter electrode of the third triode is grounded;
one end of the sixth capacitor is connected with one end of the fourteenth resistor;
the other end of the fourteenth resistor is connected with one end of the self-checking module and one end of the fifteenth resistor respectively;
the other end of the fifteenth resistor is connected with the anode of the fifth diode;
the cathode of the fifth diode is grounded.
Optionally, the power circuit module includes:
a first power circuit sub-module and a second power circuit sub-module;
the first power supply circuit submodule is respectively connected with the second power supply circuit submodule, the self-checking module, the electric leakage detection module and the tripping circuit module; the first power supply circuit submodule is used for supplying power to the self-checking module, the electric leakage detection module and the tripping circuit module;
the second power supply circuit sub-module is connected with the alarm circuit module; the second power supply circuit sub-module is used for supplying power to the first power supply circuit sub-module and the alarm circuit module.
Optionally, the first power supply circuit sub-module includes:
the voltage-dependent resistor, the first zero line access terminal, the second zero line access terminal and the live line access terminal;
the first zero line access end is connected with the self-checking module;
the second zero line access end is connected with the first port of the piezoresistor;
the first port of the piezoresistor is connected with the second power supply circuit submodule;
the live wire access end is connected with the second port of the piezoresistor;
and a second port of the piezoresistor is connected with the second power supply circuit submodule.
Optionally, the second power supply circuit sub-module includes:
sixteenth resistor, seventeenth resistor, eighteenth resistor, sixth diode, seventh diode, eighth diode, ninth diode, twelfth diode, voltage regulator tube and seventh capacitor;
the anode of the seventh capacitor is connected with the cathode of the voltage stabilizing tube, and the cathode of the seventh capacitor is connected with the anode of the voltage stabilizing tube; the anode of the voltage stabilizing tube is grounded;
the cathode of the voltage stabilizing tube is connected with one end of the eighteenth resistor;
the other end of the eighteenth resistor is connected with one end of the seventeenth resistor;
the other end of the seventeenth resistor is connected with one end of the sixteenth resistor;
the other end of the sixteenth resistor is connected with the cathode of the sixth diode;
the anode of the sixth diode is connected with the cathodes of the first power supply circuit submodule and the seventh diode respectively;
the anode of the seventh diode is connected with the anode of the eighth diode and the anode of the voltage stabilizing tube respectively;
the cathode of the eighth diode is connected with the anode of the ninth diode and the anode of the twelfth diode respectively;
the cathode of the ninth diode is connected with the cathode of the sixth diode;
the anode of the tenth diode is connected with the anodes of the first power supply circuit submodule and the sixth diode respectively;
and the cathode of the twelfth electrode tube is connected with the alarm circuit module.
Optionally, the fourth diode is a silicon controlled diode.
In a second aspect, an embodiment of the present utility model provides a leakage protector, including any one of the leakage protection circuits described above.
Compared with the prior art, the utility model has the following beneficial effects:
the utility model sets a power circuit module, a tripping circuit module, a self-checking module, an alarm circuit module and a leakage detection module in the leakage protection circuit, so that the power circuit module supplies power for the tripping circuit module, the self-checking module, the alarm circuit module and the leakage detection module, the leakage detection module detects whether the leakage protection circuit leaks electricity, when the leakage occurs, the tripping circuit module trips to realize leakage protection, after the self-checking module is electrified, the self-checking module detects whether the leakage protection function is normal, and when the function is abnormal, the alarm circuit module alarms, thereby realizing the self-checking of the leakage protection function, and when the leakage protection function is abnormal, prompting a user.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present utility model, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional leakage protector;
fig. 2 is a schematic circuit diagram of a leakage protection circuit according to an embodiment of the present utility model;
FIG. 3 is a schematic diagram of a circuit structure of another leakage protection circuit according to an embodiment of the present utility model;
fig. 4 is a schematic circuit diagram of a leakage protection circuit according to another embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The terms "first," "second," "third," "fourth" and the like in the description and in the claims and in the above drawings, if any, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion.
Fig. 1 is a schematic structural diagram of a leakage protector in the current market, in which a built-in chip detects that a leakage fault occurs, a control coil is tripped to realize a leakage protection function, but when a leakage protection circuit fails (such as a transformer fault, a coil fault, a thyristor fault, etc.), the leakage protector can cause abnormal functions, and when the leakage fault occurs, the leakage protection function cannot be realized.
In order to solve the above technical problems, an embodiment of the present utility model provides a leakage protection circuit, as shown in fig. 2, where the leakage protection circuit specifically includes:
a power circuit module 201, a tripping circuit module 202, a self-checking module 203, an alarm circuit module 204 and a leakage detection module 205;
the power circuit module 201 is respectively connected with the tripping circuit module 202, the self-checking module 203, the alarm circuit module 204 and the electric leakage detection module 205;
the alarm circuit module 204 is connected with the self-checking module 203;
the self-checking module 203 is connected with the tripping circuit module 202 and the electric leakage detection module 205;
the power supply circuit module 201 is used for supplying power to the tripping circuit module 202, the self-checking module 203, the alarm circuit module 204 and the electric leakage detection module 205;
the leakage detection module 205 is configured to detect whether the leakage protection circuit leaks electricity;
the trip circuit module 202 is used for tripping when electric leakage occurs;
the self-checking module 203 is configured to detect whether the leakage protection function is normal;
the alarm circuit module 204 is used for alarming when the leakage protection function fails.
The power circuit module 201 is respectively connected with the tripping circuit module 202, the self-checking module 203, the alarm circuit module 204 and the electric leakage detection module 205, so that power supply to the tripping circuit module 202, the self-checking module 203, the alarm circuit module 204 and the electric leakage detection module 205 is realized. When leakage occurs, the leakage detection module 205 senses that a leakage protection circuit has leakage, generates a first sensing signal, inputs the sensing signal to the analog residual current module 202, and the analog residual current module 202 outputs a high-level signal to the trip circuit module 202, so that the trip circuit module 202 can power off the leakage protection circuit through tripping to realize leakage protection; after the self-checking module 203 is powered on, the self-checking module 203 generates an analog residual current, the electric leakage detecting module 205 generates a second induction signal after detecting the analog residual current, the self-checking module 203 receives the second induction signal and then detects whether the electric leakage protection function is normal or not, and outputs a high-level signal to the alarm circuit module 204 when the detection result is abnormal in the electric leakage protection function, so that the alarm circuit module 204 alarms, and therefore whether the electric leakage protection function is normal or not is automatically detected, and a user is prompted when the electric leakage protection function is abnormal.
It should be noted that, according to actual needs, a person skilled in the art may set a detection interval for whether the leakage protection function of the leakage detection module 205 is normal, for example, detection is performed every 11 minutes, detection is performed every day, and so on.
As shown in fig. 3, in an alternative embodiment, the power circuit module 201 includes:
a first power supply circuit sub-module 301 and a second power supply circuit sub-module 302;
the first power supply circuit sub-module 301 is respectively connected with the second power supply circuit sub-module 302, the self-checking module 203, the electric leakage detection module 205 and the tripping circuit module 202; the first power supply circuit sub-module 301 is configured to supply power to the self-detection module 203, the leakage detection module 205, and the trip circuit module 202;
the second power circuit sub-module 302 is connected with the alarm circuit module 204; the second power supply circuit sub-module 302 is configured to supply power to the first power supply circuit sub-module 301 and the alarm circuit module 204.
As shown in fig. 4, in an alternative embodiment, a first power circuit sub-module 301 includes:
the voltage dependent resistor MYR1, a first zero line access terminal, a second zero line access terminal and a live line access terminal;
the first zero line access end is connected with the self-checking module 203;
the second zero line access end is connected with a first port of the piezoresistor MYR 1;
the first port of the piezoresistor MYR1 is connected with the second power supply circuit sub-module 302;
the live wire access end is connected with a second port of the piezoresistor MYR 1;
the second port of the varistor MYR1 is connected to the second power circuit sub-module 302.
The first zero line access terminal is connected with an anode of a second diode D2 in the self-checking module 203, a first port of the piezoresistor MYR1 is connected with a cathode of an eighth diode D8 in the second power supply circuit sub-module 302, and a second port of the piezoresistor MYR1 is connected with an anode of a sixth diode D6 in the second power supply circuit sub-module 302.
As shown in fig. 4, in an alternative embodiment, the second power circuit sub-module 302 includes:
sixteenth resistor R16, seventeenth resistor R17, eighteenth resistor R18, sixth diode D6, seventh diode D7, eighth diode D8, ninth diode D9, tenth diode D10, voltage regulator VD1, and seventh capacitor C7;
the anode of the seventh capacitor C7 is connected with the cathode of the voltage stabilizing tube VD1, and the cathode of the seventh capacitor C7 is connected with the anode of the voltage stabilizing tube VD 1; the anode of the voltage stabilizing tube VD1 is grounded;
the cathode of the voltage stabilizing tube VD1 is connected with one end of an eighteenth resistor R18;
the other end of the eighteenth resistor R18 is connected with one end of the seventeenth resistor R17;
the other end of the seventeenth resistor R17 is connected with one end of the sixteenth resistor R16;
the other end of the sixteenth resistor R16 is connected with the cathode of the sixth diode D6;
the anode of the sixth diode D6 is connected to the cathodes of the first power supply circuit sub-module 301 and the seventh diode D7, respectively;
the anode of the seventh diode D7 is respectively connected with the anode of the eighth diode D8 and the anode of the voltage stabilizing tube VD 1;
the cathode of the eighth diode D8 is connected with the anode of the ninth diode D9 and the anode of the twelfth diode D10 respectively;
the cathode of the ninth diode D9 is connected to the cathode of the sixth diode D6;
the anode of the twelfth polar tube D10 is respectively connected with the anodes of the first power supply circuit sub-module 301 and the sixth diode D6;
the cathode of the twelfth pole D10 is connected to the alarm circuit module 204.
After the leakage protection circuit is electrified, 230V alternating current is subjected to full-wave rectification, then is reduced in voltage through a sixteenth resistor R16, a seventeenth resistor R17 and an eighteenth resistor R18, and a seventh capacitor R7 and a voltage stabilizing tube VD1 are subjected to filtering and voltage stabilizing to form a power supply VDDRC of the leakage detection module 205.
As shown in fig. 4, in an alternative embodiment, the leakage detection module 205 includes:
the transformer, the first resistor R1, the second resistor R2, the third resistor R3 and the first capacitor C1;
the first output port ZCT1 of the transformer is respectively connected with one end of the first resistor R1 and one end of the second resistor R2;
the other end of the second resistor R2 is connected with one end of the first capacitor C1;
the second output port ZCT2 of the mutual inductor is respectively connected with the other end of the first resistor R1 and one end of the third resistor R3;
the other end of the third resistor R3 is connected with the other end of the first capacitor C1;
both ends of the first capacitor C1 are connected to the self-checking module 203.
The zero line and the live line pass through the transformer, and the live line is 230V alternating current. When the leakage protection circuit leaks electricity, the transformer inputs a first induction signal to the self-checking module 203, the self-checking module 203 outputs a high-level signal to the tripping circuit module 202, and the tripping circuit module 202 trips, so that the leakage protection function is realized.
As shown in fig. 4, in an alternative embodiment, the self-test module 203 includes:
the chip U1, the first diode D1, the second diode D2, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, the tenth resistor R10, the first triode VT1, the second triode VT2, the second capacitor C2 and the third capacitor C3;
the first pin RTC1 of the chip U1 is connected with the electric leakage detection module 205;
the second pin RTC2 of the chip U1 is connected with the electric leakage detection module 205;
the third pin GNDRC of the chip U1 is connected with the cathode of the second capacitor C2; the third pin GNDRC of the chip U1 is grounded;
the third pin GNDRC of the chip U1 is connected with the fourth pin GNDST of the chip U1;
the anode of the second capacitor C2 is respectively connected with one end of the fourth resistor R4 and the eighth pin of the chip U1;
the other end of the fourth resistor R4 is connected with one end of the fifth resistor R5;
the other end of the fifth resistor R5 is respectively connected with the power circuit module 201 and the alarm circuit module 204;
the sixth pin STIN of the chip U1 is respectively connected with one end of a sixth resistor R6 and the anode of the first diode D1;
the cathode of the first diode D1 is respectively connected with the sixth resistor R6 and the tripping circuit module 202;
the ninth pin VDDRC of the chip U1 is connected with one end of the third capacitor C3;
the tenth pin STP of the chip U1 is respectively connected with the other end of the third capacitor C3 and one end of the seventh resistor R7;
the other end of the seventh resistor R7 is connected with the collector electrode of the first triode VT 1;
the emitter of the first triode VT1 is grounded;
the base electrode of the first triode VT1 is connected with one end of an eighth resistor R8;
the other end of the eighth resistor R8 is respectively connected with one end of the tenth resistor R10 and a fifteenth pin FOUT of the chip U1;
the anode of the second diode D2 is connected to the power circuit module 201;
the cathode of the second diode D2 is connected with one end of a ninth resistor R9;
the other end of the ninth resistor R9 is connected with the collector electrode of the second triode VT 2;
the emitter of the second triode VT2 is grounded;
the base of the second triode VT2 is connected to the other end of the tenth resistor R10.
One end of the first capacitor C1 is connected with a first pin RCT1 of the chip U1, and the other end of the first capacitor C1 is connected with a second pin RCT2 of the chip U1, so that the chip U1 can receive signals transmitted by the transformer. When the chip U1 receives the first induction signal transmitted by the transformer when the circuit leaks, the twelfth pin TRIG of the chip U1 outputs a high level signal to the trip circuit module 202.
After half-wave rectification is carried out on the 230V power supply through a twelfth polar tube D10 in the power circuit module 201, the voltage is reduced through a fourth resistor R4 and a fifth resistor R5, and the second capacitor C2 is filtered to form the self-checking power supply VDDST. When the power supply VDDST of the chip U1 is electrified for the first time, self-checking is carried out after 2 seconds of electrification, the chip U1 outputs a driving signal simulating residual current faults in a negative half period during self-checking, the fifteenth pin FOUT of the chip U1 outputs a high-level signal, and the anode of the second diode D2 is connected with the zero line N in the power supply circuit module 201, so that the second triode VT2 is conducted, and a loop is formed between the N-phase electricity taking process through the second diode D2, the ninth resistor R9 and the second triodes VT2 to GND to generate simulated residual current.
As shown in fig. 4, in an alternative embodiment, the trip circuit module 202 includes:
the tripping device L1, the third diode D3, the fourth diode D4, the eleventh resistor R11, the fourth capacitor C4 and the fifth capacitor C5;
one end of the release L1 is connected with the power circuit module 201;
the other end of the release L1 is connected with the anode of the third diode D3;
the cathode of the third diode D3 is respectively connected with the anodes of the self-checking module 203 and the fourth diode D4;
the cathode of the fourth diode D4 is connected with one end of a fourth capacitor C4; the cathode of the fourth diode D4 is grounded;
one end of the fourth capacitor C4 is connected with one end of the eleventh resistor R11;
the other end of the eleventh resistor R11 is connected with the self-checking module 203;
the other end of the fourth capacitor C4 is connected with one end of the fifth capacitor C5; the other end of the fourth capacitor C4 is grounded;
the other end of the fifth capacitor C5 is connected to the self-checking module 203.
The fourth diode D4 is a silicon controlled diode, the eleventh resistor R11 is connected to the twelfth pin TRIG of the chip U1 in the self-checking module 203, and the fifth capacitor C5 is connected to the eleventh pin CFRC of the chip U1 in the self-checking module 203. After the circuit leaks electricity and the trip circuit module 202 receives the high level signal output by the twelfth pin TRIG of the chip U1, the fourth diode D4 is turned on, and the coil in the trip unit L1 is attracted, so that the circuit trips, and the leakage protection function is realized.
When the self-checking module 203 generates the analog residual current, if the circuit works normally at this time, the transformer generates the second induction signal after detecting the analog residual current, and the chip U1 sends the TRIG signal after receiving the second induction signal, so that the fourth diode D4 is turned on, and the STIN is pulled down from the high level to the low level. If the circuit is in an abnormal state, the state of the STIN pin is incorrect through self-checking, and in the following three power frequency periods, the chip U1 continuously performs three self-checking, and after the failure of the leakage protection function is determined, the sixteenth pin EOL of the chip U1 outputs a high-level alarm signal to the alarm circuit module 204, so that the alarm circuit module 204 alarms.
As shown in fig. 4, in an alternative embodiment, the alarm circuit module 204 includes:
a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a BUZZER, a fifth diode D5, a third transistor VT3, and a sixth capacitor C6;
one end of the twelfth resistor R12 is connected to the power circuit module 201;
the other end of the twelfth resistor R12 is connected with one end of the thirteenth resistor R13;
the other end of the thirteenth resistor R13 is connected with the anode of the BUZZER BUZZZER;
the cathode of the BUZZER BUZZZER is connected with the collector of the third triode VT 3;
the base electrode of the third triode VT3 is connected with one end of a sixth capacitor C6;
an emitter of the third triode VT3 is connected with the other end of the sixth capacitor C6; the emitter of the third triode VT3 is grounded;
one end of the sixth capacitor C6 is connected with one end of the fourteenth resistor R14;
the other end of the fourteenth resistor R14 is respectively connected with one ends of the self-checking module 203 and the fifteenth resistor R15;
the other end of the fifteenth resistor R15 is connected with the anode of the fifth diode D5;
the cathode of the fifth diode D5 is grounded.
The fifth diode D5 is a light emitting diode. The twelfth resistor R12 is connected to the cathode of the twelfth diode D10 in the power circuit module 201, and the fourth resistor R4 is connected to the eighth pin VDDST of the chip U1 in the self-test module 203. The power supply of the BUZZER is half-wave rectified by a tenth diode D10 in the power circuit module 201, and is reduced in voltage by a twelfth resistor R12 and a thirteenth resistor R13. After receiving the high-level alarm signal output by the EOL of the sixteenth pin of the chip U1, the alarm circuit module 204 alarms through the BUZZER and the fifth diode D5, so that the leakage protection circuit prompts a user through two alarm modes of the BUZZER and the light-emitting diode, thereby prompting the user to check the leakage protection circuit in time and reducing the electric shock risk.
According to the utility model, the power supply circuit module, the tripping circuit module, the self-checking module, the alarm circuit module and the leakage detection module are arranged in the leakage protection circuit, so that the power supply circuit module supplies power for the tripping circuit module, the self-checking module, the alarm circuit module and the leakage detection module, when leakage occurs, the tripping circuit module trips to realize leakage protection, after the self-checking module is electrified, the self-checking module generates simulated residual current, the leakage detection module detects whether the leakage protection function is normal or not, and when the function is abnormal, the alarm circuit module alarms, thereby realizing self-checking of the leakage protection function, and when the leakage protection function is abnormal, prompting a user.
The utility model also provides a leakage protector, which comprises any one of the leakage protection circuits.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles disclosed herein.
Claims (10)
1. A leakage protection circuit, the leakage protection circuit comprising:
the device comprises a power supply circuit module, a tripping circuit module, a self-checking module, an alarm circuit module and a leakage detection module;
the power supply circuit module is respectively connected with the tripping circuit module, the self-checking module, the alarm circuit module and the electric leakage detection module;
the alarm circuit module is connected with the self-checking module;
the self-checking module is connected with the tripping circuit module and the electric leakage detection module;
the power supply circuit module is used for supplying power to the tripping circuit module, the self-checking module, the alarm circuit module and the electric leakage detection module;
the leakage detection module is used for detecting whether the leakage protection circuit leaks electricity or not;
the tripping circuit module is used for tripping when electric leakage occurs;
the self-checking module is used for detecting whether the leakage protection function is normal or not;
the alarm circuit module is used for alarming when the leakage protection function fails.
2. The leakage protection circuit of claim 1, wherein the leakage detection module comprises:
the transformer, the first resistor, the second resistor, the third resistor and the first capacitor;
the first output port of the transformer is respectively connected with one end of the first resistor and one end of the second resistor;
the other end of the second resistor is connected with one end of the first capacitor;
the second output port of the mutual inductor is respectively connected with the other end of the first resistor and one end of the third resistor;
the other end of the third resistor is connected with the other end of the first capacitor;
and two ends of the first capacitor are connected with the self-checking module.
3. The leakage protection circuit of claim 1, wherein the self-test module comprises:
the circuit comprises a chip, a first diode, a second diode, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, a first triode, a second capacitor and a third capacitor;
the first pin of the chip is connected with the electric leakage detection module;
the second pin of the chip is connected with the electric leakage detection module;
the third pin of the chip is connected with the cathode of the second capacitor; the third pin of the chip is grounded;
the third pin of the chip is connected with the fourth pin of the chip;
the anode of the second capacitor is respectively connected with one end of the fourth resistor and the eighth pin of the chip;
the other end of the fourth resistor is connected with one end of the fifth resistor;
the other end of the fifth resistor is respectively connected with the power supply circuit module and the alarm circuit module;
the sixth pin of the chip is respectively connected with one end of the sixth resistor and the anode of the first diode;
the cathode of the first diode is respectively connected with the sixth resistor and the tripping circuit module;
the ninth pin of the chip is connected with one end of the third capacitor;
the tenth pin of the chip is respectively connected with the other end of the third capacitor and one end of the seventh resistor;
the other end of the seventh resistor is connected with the collector electrode of the first triode;
the emitter electrode of the first triode is grounded;
the base electrode of the first triode is connected with one end of the eighth resistor;
the other end of the eighth resistor is respectively connected with one end of the tenth resistor and a fifteenth pin of the chip;
the anode of the second diode is connected with the power circuit module;
the cathode of the second diode is connected with one end of the ninth resistor;
the other end of the ninth resistor is connected with the collector electrode of the second triode;
the emitter electrode of the second triode is grounded;
and the base electrode of the second triode is connected with the other end of the tenth resistor.
4. The leakage protection circuit of claim 1, wherein the trip circuit module comprises:
the trip, the third diode, the fourth diode, the eleventh resistor, the fourth capacitor and the fifth capacitor;
one end of the release is connected with the power circuit module;
the other end of the release is connected with the anode of the third diode;
the cathode of the third diode is connected with the anodes of the self-checking module and the fourth diode respectively;
the cathode of the fourth diode is connected with one end of the fourth capacitor; the cathode of the fourth diode is grounded;
one end of the fourth capacitor is connected with one end of the eleventh resistor;
the other end of the eleventh resistor is connected with the self-checking module;
the other end of the fourth capacitor is connected with one end of the fifth capacitor; the other end of the fourth capacitor is grounded;
the other end of the fifth capacitor is connected with the self-checking module.
5. The leakage protection circuit of claim 1, wherein the alarm circuit module comprises:
a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a buzzer, a fifth diode, a third triode and a sixth capacitor;
one end of the twelfth resistor is connected with the power circuit module;
the other end of the twelfth resistor is connected with one end of the thirteenth resistor;
the other end of the thirteenth resistor is connected with the anode of the buzzer;
the cathode of the buzzer is connected with the collector of the third triode;
the base electrode of the third triode is connected with one end of the sixth capacitor;
the emitter of the third triode is connected with the other end of the sixth capacitor; the emitter electrode of the third triode is grounded;
one end of the sixth capacitor is connected with one end of the fourteenth resistor;
the other end of the fourteenth resistor is connected with one end of the self-checking module and one end of the fifteenth resistor respectively;
the other end of the fifteenth resistor is connected with the anode of the fifth diode;
the cathode of the fifth diode is grounded.
6. The leakage protection circuit of claim 1, wherein the power circuit module comprises:
a first power circuit sub-module and a second power circuit sub-module;
the first power supply circuit submodule is respectively connected with the second power supply circuit submodule, the self-checking module, the electric leakage detection module and the tripping circuit module; the first power supply circuit submodule is used for supplying power to the self-checking module, the electric leakage detection module and the tripping circuit module;
the second power supply circuit sub-module is connected with the alarm circuit module; the second power supply circuit sub-module is used for supplying power to the first power supply circuit sub-module and the alarm circuit module.
7. The leakage protection circuit of claim 6, wherein the first power supply circuit sub-module comprises:
the voltage-dependent resistor, the first zero line access terminal, the second zero line access terminal and the live line access terminal;
the first zero line access end is connected with the self-checking module;
the second zero line access end is connected with the first port of the piezoresistor;
the first port of the piezoresistor is connected with the second power supply circuit submodule;
the live wire access end is connected with the second port of the piezoresistor;
and a second port of the piezoresistor is connected with the second power supply circuit submodule.
8. The leakage protection circuit of claim 6, wherein the second power supply circuit sub-module comprises:
sixteenth resistor, seventeenth resistor, eighteenth resistor, sixth diode, seventh diode, eighth diode, ninth diode, twelfth diode, voltage regulator tube and seventh capacitor;
the anode of the seventh capacitor is connected with the cathode of the voltage stabilizing tube, and the cathode of the seventh capacitor is connected with the anode of the voltage stabilizing tube; the anode of the voltage stabilizing tube is grounded;
the cathode of the voltage stabilizing tube is connected with one end of the eighteenth resistor;
the other end of the eighteenth resistor is connected with one end of the seventeenth resistor;
the other end of the seventeenth resistor is connected with one end of the sixteenth resistor;
the other end of the sixteenth resistor is connected with the cathode of the sixth diode;
the anode of the sixth diode is connected with the cathodes of the first power supply circuit submodule and the seventh diode respectively;
the anode of the seventh diode is connected with the anode of the eighth diode and the anode of the voltage stabilizing tube respectively;
the cathode of the eighth diode is connected with the anode of the ninth diode and the anode of the twelfth diode respectively;
the cathode of the ninth diode is connected with the cathode of the sixth diode;
the anode of the tenth diode is connected with the anodes of the first power supply circuit submodule and the sixth diode respectively;
and the cathode of the twelfth electrode tube is connected with the alarm circuit module.
9. The leakage protection circuit of claim 4, wherein the fourth diode is a silicon controlled diode.
10. A leakage protector, characterized in that it comprises a leakage protection circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321285376.2U CN220209951U (en) | 2023-05-24 | 2023-05-24 | Leakage protection circuit and leakage protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321285376.2U CN220209951U (en) | 2023-05-24 | 2023-05-24 | Leakage protection circuit and leakage protector |
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| Publication Number | Publication Date |
|---|---|
| CN220209951U true CN220209951U (en) | 2023-12-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321285376.2U Active CN220209951U (en) | 2023-05-24 | 2023-05-24 | Leakage protection circuit and leakage protector |
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| Country | Link |
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| CN (1) | CN220209951U (en) |
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