CN211556848U - Leakage protection device - Google Patents
Leakage protection device Download PDFInfo
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- CN211556848U CN211556848U CN201922162787.2U CN201922162787U CN211556848U CN 211556848 U CN211556848 U CN 211556848U CN 201922162787 U CN201922162787 U CN 201922162787U CN 211556848 U CN211556848 U CN 211556848U
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Abstract
The utility model provides an electric leakage protection device, which comprises a main control circuit, an electric leakage detection circuit, a self-checking circuit, a current-voltage conversion circuit, a voltage comparison circuit, a choke voltage reduction circuit, a rectification circuit and a load control circuit; the leakage detection circuit is respectively connected with the self-checking circuit, the current-voltage conversion circuit, the voltage comparison circuit, the flow-resisting voltage reduction circuit, the rectification circuit and the load control circuit, and the main control circuit is respectively connected with the self-checking circuit, the voltage comparison circuit and the load control circuit. The utility model discloses when electrical equipment takes place to leak electricity, disconnection electrical equipment, protection human safety and electrical equipment safety play safety protection's effect.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to the field of electronic technology, especially, relate to an earth leakage protection device.
[ background of the invention ]
The electrical equipment (load) used in daily life generates leakage current, and although the leakage current is small, the leakage current can also cause great harm, thereby generating serious consequences.
In the existing product, the leakage protection function is not provided, when electric leakage occurs to the electric equipment, the electric equipment cannot be disconnected, electric shock is caused, and the protection effect cannot be achieved. As shown in fig. 1, after the current circuit switches on, when not taking place the electric leakage, the circuit maintains normal condition, can not appear the electric leakage danger during the contact, when the electric leakage appears in the product, the shell and the phase line L of product are connected, and the human body contacts electrified shell, and transmission direction is: the current is transmitted to a human body from the phase line L, the human body to the ground and the ground to the ground wire to form a loop, so that the current flows through the human body to generate electric shock.
[ Utility model ] content
The to-be-solved technical problem of the utility model lies in providing an earth leakage protection device, when electrical equipment takes place the electric leakage, breaks off electrical equipment, protects human safety and electrical equipment safety, plays safety protection's effect.
The utility model discloses a realize like this:
a leakage protection device comprises a main control circuit, a leakage detection circuit, a self-detection circuit, a current-voltage conversion circuit, a voltage comparison circuit, a choke voltage reduction circuit, a rectification circuit and a load control circuit;
the leakage detection circuit is respectively connected with the self-checking circuit, the current-voltage conversion circuit, the voltage comparison circuit, the flow-resisting voltage reduction circuit, the rectification circuit and the load control circuit, and the main control circuit is respectively connected with the self-checking circuit, the voltage comparison circuit and the load control circuit.
Further, the leakage detection circuit comprises a core N1, a leakage coil N2 and a leakage coil N3;
the phase line L and the neutral line N are wound on the iron core N1 to form a primary coil, and the leakage coil N2 and the leakage coil N3 are respectively wound on the iron core N1 to form a secondary coil; the first port of electric leakage coil N2 is connected to self-checking circuit, the second port of electric leakage coil N2 is connected with choked current step-down circuit, rectifier circuit and load control circuit respectively, the third port of electric leakage coil N3 is connected with current-voltage conversion circuit and voltage comparison circuit respectively, the fourth port ground connection of electric leakage coil N3, the first port and the second port of electric leakage coil N2 are the input, the third port and the fourth port of electric leakage coil N3 are the output.
Further, the current-voltage conversion circuit includes a resistor R6, a capacitor C1, a diode D1, and a diode D2, wherein one end of the resistor R6, one end of the capacitor C1, a cathode of the diode D1, and an anode of the diode D2 are all connected to the voltage comparison circuit and the leakage detection circuit, and the other end of the resistor R6, the other end of the capacitor C1, an anode of the diode D1, and a cathode of the diode D2 are all grounded.
Further, the voltage comparison circuit includes a comparator IC1, a resistor R1, a resistor R2 and a resistor R4, a first pin of the comparator IC1 is connected to the main control circuit through a resistor R2, a second pin of the comparator IC1 is connected to one end of the resistor R1 and one end of the resistor R4, a third pin of the comparator IC1 is connected to the current-voltage conversion circuit and the leakage detection circuit, a fourth pin of the comparator IC1 and the other end of the resistor R4 are grounded, and an eighth pin of the comparator IC1 and the other end of the resistor R1 are connected to the power supply.
Further, the comparator IC1 is of the LM393 type.
Further, the self-checking circuit comprises an NPN triode Q1, a resistor R3, a resistor R5 and a capacitor E1, wherein a base of the NPN triode Q1 is connected to the main control circuit through a resistor R5, an emitter of the NPN triode Q1 is grounded, a collector of the NPN triode Q1 is connected to a negative electrode of the capacitor E1 through a resistor R3, and a positive electrode of the capacitor E1 is connected to the leakage detection circuit.
Further, the voltage reducing and blocking circuit comprises a resistor R7, a resistor R8, a resistor R9 and a capacitor C2, wherein one end of the resistor R7 and one end of the capacitor C2 are both connected to the leakage detection circuit, the other end of the resistor R7 is connected to one end of the resistor R8, and the other end of the resistor R8 and the other end of the capacitor C2 are both connected to the phase line L through the resistor R9.
Further, the load control circuit comprises a relay RY1, a diode D3, an NPN triode Q2 and a resistor R10, one end of a contact switch V of the relay RY1 is connected to the leakage detection circuit, and the other end of the contact switch V of the relay RY1 is connected to the load; one end of a coil REALAY of the relay RY1 and the negative electrode of the diode D3 are connected to a power supply, a collector of the NPN triode Q2 is connected to the other end of the coil REALAY and the positive electrode of the diode D3 respectively, an emitter of the NPN triode Q2 is grounded, and a base of the NPN triode Q2 is connected to the main control circuit through a resistor R10.
Further, the rectifier circuit is a bridge rectifier circuit DB1, a first port of the bridge rectifier circuit DB1 is connected to a neutral line N, a third port of the bridge rectifier circuit DB1 is connected to the leakage detection circuit, and a second port and a fourth port of the bridge rectifier circuit DB1 are suspended.
Furthermore, the main control circuit adopts an MCU of which the model is S3F8S45, a sixteenth pin of the main control circuit is connected to the self-checking circuit, a seventeenth pin of the main control circuit is connected to the voltage comparison circuit, and an eighteenth pin of the main control circuit is connected to the load control circuit.
The utility model has the advantages that: the utility model discloses in have master control circuit, the electric leakage detection circuitry, the self-checking circuit, current-voltage conversion circuit, voltage comparison circuit, choked flow step-down circuit, rectifier circuit and load control circuit, detect the electrical equipment electric leakage condition by the electric leakage detection circuitry, when taking place the electric leakage, the electric leakage detection circuitry can produce the signal, handle for voltage comparison circuit through current-voltage conversion circuit, then transmit for master control circuit, judge whether reach the electric leakage standard by master control circuit, when reaching, provide a turn-off signal and give load control circuit, close by load control circuit control electrical equipment. The utility model discloses a structure makes when electrical equipment appears the electric leakage, in time cuts off the electrical equipment of electric leakage, plays the effect of protection.
[ description of the drawings ]
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic circuit diagram of the prior art.
Fig. 2 is a schematic diagram of a circuit structure of the leakage protection device of the present invention.
[ detailed description ] embodiments
The embodiment of the utility model provides a through providing an earth leakage protection device, solved among the prior art because of electrical equipment produces the technical problem that leakage current leads to human harm, realized the technological effect of protection human safety and electrical equipment safety.
For better understanding of the above technical solutions, the following detailed descriptions will be provided in conjunction with the drawings and the detailed description of the embodiments.
Abbreviations and key term definitions:
I/O is an input/output port;
phase lines (english LIVE, abbreviated L), typically red or brown (IEC system) or black (UL system);
the NEUTRAL line (english NEUTRAL, abbreviated N), generally blue (IEC system) or white (UL system);
S3F8S45MCU micro control Unit (MicrocontrollerUni); also known as a single chip Microcomputer (SingleChip Microcomputer) or a single chip Microcomputer.
Referring to fig. 2, the leakage protection device of the present invention includes a main control circuit, a leakage detection circuit, a self-checking circuit, a current-voltage conversion circuit, a voltage comparison circuit, a voltage-limiting step-down circuit, a rectification circuit and a load control circuit;
the leakage detection circuit is respectively connected with the self-checking circuit, the current-voltage conversion circuit, the voltage comparison circuit, the current-resisting voltage reduction circuit, the rectification circuit and the load control circuit, and the main control circuit is respectively connected with the self-checking circuit, the voltage comparison circuit and the load control circuit;
the leakage detection circuit detects the leakage condition of the electrical equipment, when the leakage occurs, the leakage detection circuit generates a signal, the signal is processed by the current-voltage conversion circuit to the voltage comparison circuit and then transmitted to the main control circuit, the main control circuit judges whether the leakage standard is met, when the leakage standard is met, a turn-off signal is provided to the load control circuit, and the load control circuit controls the electrical equipment to be turned off; in addition, the leakage protection device is subjected to self-checking processing through the self-checking circuit, and signals are subjected to voltage reduction and rectification processing through the choke voltage reduction circuit and the rectification circuit.
One specific embodiment is:
preferably, the leakage detection circuit comprises a core N1, a leakage coil N2 and a leakage coil N3;
the phase line L and the neutral line N are wound on the iron core N1 to form a primary coil, the leakage coil N2 and the leakage coil N3 are respectively wound on the iron core N1 to form a secondary coil, and induced electromotive force and signals can be generated through the primary coil, the iron core and the secondary coil during electric leakage; the first port of the leakage coil N2 is connected to a self-test circuit (the positive electrode of a capacitor E1 in the self-test circuit), the second port of the leakage coil N2 is connected to a current-voltage reducing circuit, a rectifying circuit and a load control circuit, the third port of the leakage coil N3 is connected to a current-voltage converting circuit (one end of a resistor R6, one end of a capacitor C1, the negative electrode of a diode D1 and the positive electrode of a diode D2 in the current-voltage converting circuit) and a voltage comparison circuit (the third pin of a comparator IC 1), the fourth port of the leakage coil N3 is grounded, the first port and the second port of the leakage coil N2 are input ends, and the third port and the fourth port of the leakage coil N3 are output ends.
Preferably, the current-voltage conversion circuit includes a resistor R6, a capacitor C1, a diode D1 and a diode D2, one end of the resistor R6, one end of the capacitor C1, a cathode of the diode D1 and an anode of the diode D2 are all connected to the voltage comparison circuit (the third pin of the comparator IC 1) and the leakage detection circuit (the third port of the leakage coil N3), and the other end of the resistor R6, the other end of the capacitor C1, the anode of the diode D1 and the cathode of the diode D2 are all grounded; the induced current signals output from the third port and the fourth port of the leakage coil N3 are converted into voltage signals through the resistor R6, the capacitor C1 performs a filtering function, and the diode D1 and the diode D2 perform a voltage amplitude limiting function.
Preferably, the voltage comparison circuit includes a comparator IC1, a resistor R1, a resistor R2 and a resistor R4, the comparator IC1 is of an LM393 type, the first pin of the comparator IC1 is connected to the main control circuit (the seventeenth pin of the MCU) through a resistor R2, the second pin of the comparator IC1 is connected to one end of the resistor R1 and one end of the resistor R4, the third pin of the comparator IC1 is connected to the current-voltage conversion circuit (one end of the resistor R6, one end of the capacitor C1, the cathode of the diode D1 and the anode of the diode D2) and the leakage detection circuit (the third port of the leakage coil N3), the fourth pin of the comparator IC1 and the other end of the resistor R4 are grounded, and the eighth pin of the comparator IC1 and the other end of the resistor R1 are connected to the power supply; for performing comparison processing on the signals.
Preferably, the self-test circuit includes an NPN transistor Q1, a resistor R3, a resistor R5 and a capacitor E1, the base of the NPN transistor Q1 is connected to the main control circuit (the sixteenth pin of the MCU) through a resistor R5, the emitter of the NPN transistor Q1 is grounded, the collector of the NPN transistor Q1 is connected to the negative electrode of the capacitor E1 through a resistor R3, and the positive electrode of the capacitor E1 is connected to the leakage detection circuit (the first port of the leakage coil N2).
Preferably, the step-down circuit includes a resistor R7, a resistor R8, a resistor R9 and a capacitor C2, one end of the resistor R7 and one end of the capacitor C2 are both connected to the leakage detection circuit (the second port of the leakage coil N2), the other end of the resistor R7 is connected to one end of the resistor R8, and the other end of the resistor R8 and the other end of the capacitor C2 are both connected to the phase line L through the resistor R9; used for carrying out voltage reduction processing on the signals.
Preferably, the load control circuit comprises a relay RY1, a diode D3, an NPN triode Q2 and a resistor R10, one end of a contact switch V of the relay RY1 is connected to the leakage detection circuit (the second port of the leakage coil N2), and the other end of the contact switch V of the relay RY1 is connected to the load; one end of a coil REALAY of the relay RY1 and the negative electrode of the diode D3 are connected to a power supply, a collector of the NPN triode Q2 is connected to the other end of the coil REALAY and the positive electrode of the diode D3 respectively, an emitter of the NPN triode Q2 is grounded, and a base of the NPN triode Q2 is connected to a main control circuit (an eighteenth pin of the MCU) through a resistor R10.
Preferably, the rectifier circuit is a bridge rectifier circuit DB1, a first port of the bridge rectifier circuit DB1 is connected to the neutral line N, a third port of the bridge rectifier circuit DB1 is connected to the leakage detection circuit (the second port of the leakage coil N2), and a second port and a fourth port of the bridge rectifier circuit DB1 are suspended for rectifying signals.
Preferably, the main control circuit adopts an MCU with a model number S3F8S45, a sixteenth pin of the main control circuit is connected to a self-test circuit (one end of a resistor R5), a seventeenth pin of the main control circuit is connected to a voltage comparison circuit (one end of a resistor R2), and an eighteenth pin of the main control circuit is connected to a load control circuit (one end of a resistor R10).
The working principle of the utility model is as follows:
in the electric leakage detection circuit, an iron core N1 is utilized, a phase line L and a neutral line N penetrate through an iron core N1, the phase line L and the neutral line N which are protected form a primary coil, and a leakage coil N2 and a leakage coil N3 which are wound on the iron core N1 form a secondary coil; when no electric leakage occurs between the L line and the N line, the sum of the current vectors of the phase line L and the neutral line N is zero, no induced electromotive force is generated, no signal is generated and processed by the current-voltage conversion circuit to the voltage comparison circuit, when the electric leakage occurs, the sum of the current vectors of the neutral line N and the phase line L is not zero, induced electromotive force is generated on the leakage coil N3 to generate a signal, the signal is rectified, filtered and converted by the current-voltage conversion circuit and then transmitted to the voltage comparison circuit for comparison, the signal after the comparison processing is transmitted to the main control circuit (S3F8S45MCU) for processing, then the MCU judges whether the signal reaches the electric leakage standard, when the signal reaches or exceeds the preset value, the signal provides a turn-off signal to the relay RY1 of the load control circuit, and the relay RY1 cuts off the load (RY equipment) with the electric leakage. When leakage occurs, the turn-off control is carried out in an extreme time, and the rated current ratio is selected according to the magnitude of the current to be measured.
Although specific embodiments of the present invention have been described, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the claims appended hereto.
Claims (10)
1. An earth leakage protection device, characterized by: comprises a main control circuit, a leakage detection circuit, a self-detection circuit, a current-voltage conversion circuit, a voltage comparison circuit, a choke voltage reduction circuit, a rectification circuit and a load control circuit;
the leakage detection circuit is respectively connected with the self-checking circuit, the current-voltage conversion circuit, the voltage comparison circuit, the flow-resisting voltage reduction circuit, the rectification circuit and the load control circuit, and the main control circuit is respectively connected with the self-checking circuit, the voltage comparison circuit and the load control circuit.
2. A residual current device as claimed in claim 1, characterized in that: the electric leakage detection circuit comprises an iron core N1, an electric leakage coil N2 and an electric leakage coil N3;
the phase line L and the neutral line N are wound on the iron core N1 to form a primary coil, and the leakage coil N2 and the leakage coil N3 are respectively wound on the iron core N1 to form a secondary coil; the first port of electric leakage coil N2 is connected to self-checking circuit, the second port of electric leakage coil N2 is connected with choked current step-down circuit, rectifier circuit and load control circuit respectively, the third port of electric leakage coil N3 is connected with current-voltage conversion circuit and voltage comparison circuit respectively, the fourth port ground connection of electric leakage coil N3, the first port and the second port of electric leakage coil N2 are the input, the third port and the fourth port of electric leakage coil N3 are the output.
3. A residual current device as claimed in claim 1, characterized in that: the current-voltage conversion circuit comprises a resistor R6, a capacitor C1, a diode D1 and a diode D2, one end of the resistor R6, one end of the capacitor C1, the cathode of the diode D1 and the anode of the diode D2 are all connected to the voltage comparison circuit and the leakage detection circuit, and the other end of the resistor R6, the other end of the capacitor C1, the anode of the diode D1 and the cathode of the diode D2 are all grounded.
4. A residual current device as claimed in claim 1, characterized in that: the voltage comparison circuit comprises a comparator IC1, a resistor R1, a resistor R2 and a resistor R4, a first pin of the comparator IC1 is connected to the main control circuit through a resistor R2, a second pin of the comparator IC1 is connected with one end of the resistor R1 and one end of the resistor R4 respectively, a third pin of the comparator IC1 is connected to the current-voltage conversion circuit and the leakage detection circuit, a fourth pin of the comparator IC1 and the other end of the resistor R4 are grounded, and an eighth pin of the comparator IC1 and the other end of the resistor R1 are connected to the power supply.
5. A residual current device as claimed in claim 4, characterized in that: the comparator IC1 is of the LM393 type.
6. A residual current device as claimed in claim 1, characterized in that: the self-detection circuit comprises an NPN triode Q1, a resistor R3, a resistor R5 and a capacitor E1, the base electrode of the NPN triode Q1 is connected to the main control circuit through a resistor R5, the emitter electrode of the NPN triode Q1 is grounded, the collector electrode of the NPN triode Q1 is connected to the negative electrode of the capacitor E1 through a resistor R3, and the positive electrode of the capacitor E1 is connected to the electric leakage detection circuit.
7. A residual current device as claimed in claim 1, characterized in that: the resistance-blocking voltage reduction circuit comprises a resistor R7, a resistor R8, a resistor R9 and a capacitor C2, one end of the resistor R7 and one end of the capacitor C2 are both connected to the leakage detection circuit, the other end of the resistor R7 is connected to one end of the resistor R8, and the other end of the resistor R8 and the other end of the capacitor C2 are both connected to a phase line L through the resistor R9.
8. A residual current device as claimed in claim 1, characterized in that: the load control circuit comprises a relay RY1, a diode D3, an NPN triode Q2 and a resistor R10, one end of a contact switch V of the relay RY1 is connected to the electric leakage detection circuit, and the other end of the contact switch V of the relay RY1 is connected to a load; one end of a coil REALAY of the relay RY1 and the negative electrode of the diode D3 are connected to a power supply, a collector of the NPN triode Q2 is connected to the other end of the coil REALAY and the positive electrode of the diode D3 respectively, an emitter of the NPN triode Q2 is grounded, and a base of the NPN triode Q2 is connected to the main control circuit through a resistor R10.
9. A residual current device as claimed in claim 1, characterized in that: the rectifier circuit is a bridge rectifier circuit DB1, a first port of the bridge rectifier circuit DB1 is connected to a neutral line N, a third port of the bridge rectifier circuit DB1 is connected to the electric leakage detection circuit, and a second port and a fourth port of the bridge rectifier circuit DB1 are suspended.
10. A residual current device as claimed in claim 1, characterized in that: the master control circuit adopts the MCU of model S3F8S45, master control circuit ' S sixteenth pin is connected to the self-checking circuit, master control circuit ' S seventeenth pin is connected to voltage comparison circuit, master control circuit ' S eighteenth pin is connected to load control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922162787.2U CN211556848U (en) | 2019-12-06 | 2019-12-06 | Leakage protection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922162787.2U CN211556848U (en) | 2019-12-06 | 2019-12-06 | Leakage protection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211556848U true CN211556848U (en) | 2020-09-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922162787.2U Expired - Fee Related CN211556848U (en) | 2019-12-06 | 2019-12-06 | Leakage protection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211556848U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512954A (en) * | 2021-09-13 | 2022-05-17 | 上海正泰智能科技有限公司 | Detection circuit, detection method and circuit breaker |
-
2019
- 2019-12-06 CN CN201922162787.2U patent/CN211556848U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114512954A (en) * | 2021-09-13 | 2022-05-17 | 上海正泰智能科技有限公司 | Detection circuit, detection method and circuit breaker |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200922 Termination date: 20201206 |