CN216310118U - Digital leakage current sensor and detection circuit - Google Patents
Digital leakage current sensor and detection circuit Download PDFInfo
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- CN216310118U CN216310118U CN202122405099.1U CN202122405099U CN216310118U CN 216310118 U CN216310118 U CN 216310118U CN 202122405099 U CN202122405099 U CN 202122405099U CN 216310118 U CN216310118 U CN 216310118U
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Abstract
The utility model discloses a detection circuit based on a digital leakage current sensor, and relates to the technical field of circuits. The feeder comprises a switch state acquisition circuit, a current acquisition circuit, a main control circuit and a communication circuit, wherein the input end of the switch state acquisition circuit is electrically connected with an auxiliary contact in a breaker in a feeder line, and the input end of the current acquisition circuit is connected with an excitation coil; the output ends of the switch state acquisition circuit and the current acquisition circuit are electrically connected with the main control circuit, the current acquisition circuit outputs a leakage current signal to the main control circuit in a pulse width signal form, the switch state acquisition circuit outputs a switch state to the main control circuit in a switching value form, a main control circuit receiving signal is converted into a digital circuit according to program convention, and the communication circuit is connected with the main control circuit and transmits the digital signal converted by the main control circuit to an upper computer. And a switching value acquisition interface is added, and the feeder switch information and the insulation information are uploaded to an upper computer together, so that the structure of the direct-current power supply is simplified.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a digital leakage current sensor and a detection circuit.
Background
In the leakage current detection of the existing direct current power supply system, a leakage current sensor is usually used for detecting the magnitude of a difference current between positive and negative in a circuit, and feeder insulation information is fed back to an upper computer for display through an insulation detection unit; the selected switch detection unit collects the alarm and trip signals of the feeder switch and uploads the signals to the upper computer for display.
The sensors are connected with the detection unit through copper wires, when the number of feeders of a direct-current power supply system is large, the number of connecting wire harnesses is large, sensor analog quantity is output, the distance from the sensors to the detection unit is long, interference is prone to occurring, data are inaccurate, and false alarm occurs. This solution requires two detection units in the middle, is costly, and has a long response time of the system when there is a fault.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a digital leakage current sensor and a detection circuit, which are convenient to detect and small in error.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a detection circuit based on a digital leakage current sensor comprises a switch state acquisition circuit, a current acquisition circuit, a main control circuit and a communication circuit;
the input end of the switch state acquisition circuit is electrically connected with an auxiliary contact in a circuit breaker in the feeder line and is used for acquiring the switch state of the circuit breaker in the feeder line;
the input end of the current acquisition circuit is connected with the excitation coil and is used for acquiring a leakage current signal passing through the excitation coil and outputting the leakage current signal to a pulse width signal;
the output ends of the switch state acquisition circuit and the current acquisition circuit are electrically connected with the main control circuit, the current acquisition circuit outputs a leakage current signal to the main control circuit in a pulse width signal mode, the switch state acquisition circuit outputs a switch state to the main control circuit in a switching value mode, and the main control circuit receives signals and converts the signals into digital signals according to program convention;
the communication circuit is connected with the main control circuit and transmits the digital signals converted by the main control circuit to an upper computer.
The technical scheme also comprises a power supply voltage stabilizing circuit which is respectively and electrically connected to the switch state acquisition circuit, the current acquisition circuit, the main control circuit and the communication circuit.
In the above technical solution, the main control circuit may further perform zero point and amplitude correction on the digital signal.
The utility model also provides a digital leakage current sensor which comprises a shell, an annular magnetic core, an excitation coil, a socket, a connector, an indicator light and a circuit board; the excitation coil evenly twines on annular magnetic core, inside annular magnetic core and the circuit board were fixed in the casing, connector and pilot lamp electric connection were on the circuit board.
The socket is positioned outside the shell and is electrically connected with the circuit board;
the circuit board is integrated with the digital leakage current sensor detection circuit.
In the technical scheme, the connector is an XH connector.
Annular magnetic core and socket in above-mentioned technical scheme are fixed in inside the casing through the embedment.
The utility model has the beneficial effects that: by utilizing the principle of the fluxgate and combining the digital communication technology, the digital leakage current sensor is converted from the traditional analog quantity output into the digital quantity output with strong anti-interference performance; the zero offset and geomagnetic influence of the traditional sensor are solved through the functions of automatically calibrating the zero and the amplitude by software; and a switching value acquisition interface is added, and the feeder switch information and the insulation information are uploaded to an upper computer together, so that the structure of the direct-current power supply is simplified.
Drawings
Fig. 1 is a schematic circuit diagram of a detection circuit based on a digital leakage current sensor according to the present invention.
Fig. 2 is a diagram of an embodiment of a switch state acquisition circuit in a detection circuit based on a digital leakage current sensor according to the present invention.
Fig. 3 is a diagram of an embodiment of a current collection circuit in a detection circuit based on a digital leakage current sensor according to the present invention.
Fig. 4 is a diagram of an embodiment of a main control circuit in a digital leakage current sensor-based detection circuit according to the present invention.
Fig. 5 is a diagram of a communication circuit in a detection circuit based on a digital leakage current sensor according to an embodiment of the present invention.
FIG. 6 is a diagram of an embodiment of a power supply voltage stabilizing circuit in a digital leakage current sensor-based detection circuit according to the present invention.
Fig. 7 is a schematic perspective view of a digital leakage current sensor according to the present invention.
Fig. 8 is an exploded view of a digital leakage current sensor according to the present invention.
Detailed Description
The utility model is further illustrated with reference to the following figures and examples.
The conception, the specific structure, and the technical effects produced by the present invention will be clearly and completely described below in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the features, and the effects of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and those skilled in the art can obtain other embodiments without inventive effort based on the embodiments of the present invention, and all embodiments are within the protection scope of the present invention. In addition, all the connection/connection relations referred to in the patent do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection auxiliary components according to specific implementation conditions. All technical characteristics in the utility model can be interactively combined on the premise of not conflicting with each other.
Referring to fig. 1, the utility model provides a detection circuit based on a digital leakage current sensor, the circuit uploads feeder switch information and insulation information to an upper computer 6 by adding a switch acquisition interface, the structure of a direct current power supply is simplified, and the detection circuit is more stable and reliable, concretely, the circuit comprises a switch state acquisition circuit 1, a current acquisition circuit 2, a main control circuit 3, a communication circuit 4 and a power supply voltage stabilizing circuit 5, and the power supply voltage stabilizing circuit 5 is respectively and electrically connected to the switch state acquisition circuit 1, the current acquisition circuit 2, the main control circuit 3 and the communication circuit 4; the input end of the switch state acquisition circuit 1 is electrically connected with an auxiliary contact in a circuit breaker in the feeder line and is used for acquiring the switch state of the circuit breaker in the feeder line; the input end of the current acquisition circuit 2 is connected with the excitation coil and is used for acquiring a leakage current signal passing through the excitation coil; the output ends of the switch state acquisition circuit 1 and the current acquisition circuit 2 are electrically connected with the main control circuit 3, the current acquisition circuit 2 outputs a leakage current signal to the main control circuit 3 in a pulse width signal form, the switch state acquisition circuit 1 outputs the switch state to the main control circuit 3 in a switching value form, the main control circuit 3 receives the signal and converts the signal into a digital signal according to a program convention, and the main control circuit 3 can also correct the zero point and the amplitude of the digital signal; the communication circuit 4 is connected with the main control circuit 3 and transmits the digital signals converted by the main control circuit 3 to the upper computer 6. The feeder switch information and the insulation information are integrated and converted into digital signals to be sent to the upper computer 6, the problem that two detection units are too far in conventional operation and too slow in response when faults occur is solved, the digital signals and the digital signals are adopted to correct zero points and amplitude values, interference is avoided, the problems of zero point offset and geomagnetic influence of a traditional sensor are solved, data are more accurate, and false alarm is avoided.
For the switch state acquisition circuit 1, as shown in fig. 2, the present invention provides a specific embodiment. For the current acquisition circuit 2, as shown in fig. 3, the present invention provides a specific embodiment. For the main control circuit 3, as shown in fig. 4, the present invention provides a specific embodiment. For the communication circuit 4, as shown in fig. 5, the present invention provides an embodiment. As shown in FIG. 6, the present invention provides an embodiment of the power supply voltage stabilizing circuit 5. The circuit structure in the above embodiments refers to the drawings, and the specific circuit structure in this embodiment will not be described in detail.
Through foretell circuit structure, gather the switch information and the insulation information of feeder through on-off state acquisition circuit 1 and current acquisition circuit 2, be converted into digital signal by master control circuit 3 and upload to host computer 6 together, become a detecting element by two detecting element, and sensor output RS485 bus line form, wiring parallel structure reduces wiring pencil quantity to DC power supply's structure has been simplified, and data accuracy more.
Referring to fig. 7 and 8, the present invention further provides a digital leakage current sensor, which includes a housing 12, an annular magnetic core 7, a socket 11, a connector 9, an excitation coil, an indicator light 8 and a circuit board 10, wherein the connector 9 is an XH connector; excitation coil evenly winds on annular magnetic core 7, inside annular magnetic core 7 and circuit board 10 were fixed in casing 12, annular magnetic core 7 and socket 11 were fixed in casing 12 through the embedment in, connector 9 and 8 electric connection of pilot lamp on the circuit board, socket 11 were located casing 12 outsidely to with circuit board 10 electric connection, the integrated foretell digital leakage current sensor detection circuitry that has on circuit board 10, consequently no longer explain in detail to the structure of digital quantity hall current sensor debugging circuit.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (6)
1. A detection circuit based on a digital leakage current sensor, characterized by: the device comprises a switch state acquisition circuit, a current acquisition circuit, a main control circuit and a communication circuit;
the input end of the switch state acquisition circuit is electrically connected with an auxiliary contact in a circuit breaker in the feeder line and is used for acquiring the switch state of the circuit breaker in the feeder line;
the input end of the current acquisition circuit is connected with the excitation coil and is used for acquiring a leakage current signal passing through the excitation coil;
the output ends of the switch state acquisition circuit and the current acquisition circuit are electrically connected with the main control circuit, the current acquisition circuit outputs a leakage current signal to the main control circuit in a pulse width signal mode, the switch state acquisition circuit outputs a switch state to the main control circuit in a switching value mode, and the main control circuit receives signals and converts the signals into digital signals according to program convention;
the communication circuit is connected with the main control circuit and transmits the digital signals converted by the main control circuit to an upper computer.
2. The digital leakage current sensor-based detection circuit of claim 1, wherein: the power supply voltage stabilizing circuit is electrically connected to the switch state acquisition circuit, the current acquisition circuit, the main control circuit and the communication circuit respectively.
3. The digital leakage current sensor-based detection circuit of claim 1, wherein: the master control circuit can also correct the zero point and the amplitude of the digital signal.
4. A digital leakage current sensor, comprising: the magnetic field indicator comprises a shell, an annular magnetic core, an excitation coil, a socket, a connector, an indicator light and a circuit board; the excitation coil is uniformly wound on the annular magnetic core, the annular magnetic core and the circuit board are fixed in the shell, and the connector and the indicator lamp are electrically connected on the circuit board;
the socket is positioned outside the shell and is electrically connected with the circuit board;
the circuit board has integrated thereon a digital leakage current sensor detection circuit according to any one of claims 1 to 3.
5. The digital leakage current sensor of claim 4, wherein: the connector is an XH connector.
6. The digital leakage current sensor of claim 4, wherein: the annular magnetic core and the socket are fixed inside the shell through potting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122405099.1U CN216310118U (en) | 2021-09-30 | 2021-09-30 | Digital leakage current sensor and detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122405099.1U CN216310118U (en) | 2021-09-30 | 2021-09-30 | Digital leakage current sensor and detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216310118U true CN216310118U (en) | 2022-04-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122405099.1U Active CN216310118U (en) | 2021-09-30 | 2021-09-30 | Digital leakage current sensor and detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216310118U (en) |
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2021
- 2021-09-30 CN CN202122405099.1U patent/CN216310118U/en active Active
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