CN216310106U - Microampere alternating current digital sensor and micro-current detection circuit - Google Patents
Microampere alternating current digital sensor and micro-current detection circuit Download PDFInfo
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- CN216310106U CN216310106U CN202122408466.3U CN202122408466U CN216310106U CN 216310106 U CN216310106 U CN 216310106U CN 202122408466 U CN202122408466 U CN 202122408466U CN 216310106 U CN216310106 U CN 216310106U
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Abstract
The utility model discloses a microampere alternating current digital sensor and a micro-current detection circuit, and relates to the technical field of sensors, wherein the micro-current detection circuit comprises a current acquisition circuit, a main control circuit and a communication circuit; the current acquisition circuit is provided with a signal input end and a signal output end, the signal input end comprises a coil wound on the annular magnetic core, and the current of the coil is detected through the current acquisition circuit; the communication circuit is connected between the main control circuit and the upper computer and is used for uploading the output of the main control circuit to the upper computer; the utility model has the beneficial effects that: the microampere alternating current is isolated and detected, and a digital signal is output according to a communication protocol to replace the traditional analog quantity signal output.
Description
Technical Field
The utility model relates to the technical field of sensors, in particular to a microampere alternating current digital sensor and a microcurrent detection circuit.
Background
At present, in the small current detection of a direct current power supply system, an alternating current leakage current sensor is generally adopted to detect the size of the alternating current of a branch circuit, but the microampere weak small current cannot be accurately measured; sensors in the market are all in a wire perforation mode, when the sensors break down, all wires need to be untied, and then the sensors are disassembled, so that the sensors are difficult to maintain; in addition, the output form of the conventional sensor is an analog signal, and the anti-interference performance is poor.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides a microampere alternating current digital sensor and a microcurrent detection circuit, wherein microampere current to be detected is amplified, then sampling, rectifying and filtering are carried out, and the microampere current is converted into a digital signal by a main control circuit and is output.
The technical scheme adopted by the utility model for solving the technical problems is as follows: the micro-current detection circuit of the microampere alternating current digital sensor is improved in that the micro-current detection circuit comprises a current acquisition circuit, a main control circuit and a communication circuit;
the current acquisition circuit is provided with a signal input end and a signal output end, the signal input end comprises a coil wound on the annular magnetic core, and the current of the coil is detected through the current acquisition circuit;
the main control circuit is connected with the signal output end of the current acquisition circuit and is used for outputting a corresponding digital signal according to the current magnitude detected by the current acquisition circuit;
the communication circuit is connected between the main control circuit and the upper computer and used for uploading the digital signals output by the main control circuit to the upper computer.
In the above structure, the main control circuit further includes an a/D conversion module, and the a/D conversion module is configured to convert the analog signal output by the current collection circuit into a digital signal.
In the above structure, the power supply circuit is electrically connected to the main control circuit, and is used for providing electric energy for the current acquisition circuit, the main control circuit and the communication circuit during operation.
In the above structure, the current collecting circuit includes an operational amplifier U5C, an operational amplifier U5D, an operational amplifier U5A, and an operational amplifier U5B;
one end of the coil is grounded, the other end of the coil is connected to the positive input end of an operational amplifier U5C, a capacitor C8 and a resistor R13 which are connected in series are arranged between the output end of the operational amplifier U5C and the negative input end of the operational amplifier U5D, and a resistor R15 is arranged between the positive input end of the operational amplifier U5D and the ground end;
the output end of the operational amplifier U5D and the positive input end of the operational amplifier U5A are provided with a diode D4B, a resistor R16, a resistor R17 and a resistor R18 which are connected in series, the output end of the operational amplifier U5A is connected with the positive input end of the operational amplifier U5B, the negative input end of the operational amplifier U5B is connected with the output end of the operational amplifier U5B, a resistor R21 is arranged between the output end and the signal output end of the operational amplifier U5B, and a capacitor C14 is arranged between the signal output end and the ground end.
In the above configuration, a resistor R8 is provided between the inverting input terminal of the operational amplifier U5C and the ground, and a resistor R9 is provided between the inverting input terminal of the operational amplifier U5C and the output terminal of the operational amplifier U5C.
In the above structure, a diode D4A is disposed between the inverting input terminal of the operational amplifier U5D and the output terminal of the operational amplifier U5D;
the common end between the capacitor C8 and the resistor R13 is a first common end, the common end between the resistor R16 and the resistor R17 is a second common end, a resistor R12 is arranged between the first common end and the second common end, and a resistor R14 is arranged between the inverting input end and the second common end of the operational amplifier U5D.
In the above structure, the common terminal between the resistor R17 and the resistor R18 is a third common terminal, a capacitor C9 is disposed between the third common terminal and the ground terminal, and a capacitor C10 is disposed between the positive input terminal of the operational amplifier U5A and the ground terminal;
the operational amplifier U5A has a positive power supply end and a negative power supply end, a capacitor C11 is arranged between the positive power supply end and the grounding end, and a capacitor C12 is arranged between the negative power supply end and the grounding end;
a resistor R19 is arranged between the negative input end and the ground end of the operational amplifier U5A, and a capacitor C13 and a resistor R20 which are connected in parallel are arranged between the negative input end and the output end of the operational amplifier U5A.
In the above structure, the main control circuit includes a main control chip U4, and the main control chip U4 has a pin P1.2 connected to the signal output terminal, a signal output pin DIR, a signal output pin TXD, and a signal output pin RXD;
the communication circuit comprises a communication chip U3, and the communication chip U3 is provided with a signal receiving pin DIR, a signal receiving pin TXD and a signal receiving pin RXD.
On the other hand, the utility model also provides a microampere-level alternating current digital sensor, which is improved in that the microampere-level alternating current digital sensor comprises a framework, an annular magnetic core arranged in the middle of the framework, a coil wound on the annular magnetic core, a circuit board arranged on the framework and a socket positioned on the circuit board;
the micro-current detection circuit of the microampere alternating current digital sensor is integrated on the circuit board.
The framework is provided with a guide pin which is connected with a copper wire of the circuit board in a welding way, and the measured current signal is wound in the coil for multiple times to be amplified by multiple times;
the socket is welded with the circuit board and is used for introducing a current signal to be measured and a digital signal output by the communication circuit and working voltage input in the power circuit.
The utility model has the beneficial effects that: the microampere alternating current signal is amplified, isolated and measured, and a linear digital signal is output, so that the blank of a microampere leakage current sensor on the market is filled; and a plug-in mounting mode is adopted, so that the maintenance is convenient and simple.
Drawings
Fig. 1 is a schematic circuit diagram of a micro-current detection circuit of a microampere-level alternating current digital sensor according to the present invention. Fig. 2 and 3 are schematic diagrams of a power circuit of a micro-current detection circuit of a microampere-level alternating current digital sensor according to the present invention.
Fig. 4 and 5 are schematic diagrams of a current acquisition circuit of a micro-current detection circuit of a microampere-level alternating current digital sensor according to the present invention.
Fig. 6 is a schematic diagram of a main control circuit of the micro-current detection circuit of the microampere-level ac digital sensor according to the present invention.
Fig. 7 is a schematic diagram of a communication circuit of the micro-current detection circuit of the microampere-level ac digital sensor according to the present invention.
Fig. 8 is a schematic structural diagram of a microampere-level ac digital 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 discloses a micro-current detection circuit of a microampere-level alternating current digital sensor, which comprises a current acquisition circuit 10, a main control circuit 20, a communication circuit 30 and an upper computer 40; the current acquisition circuit 10 is provided with a signal input end and a signal output end, the signal input end comprises a coil 101 wound on the annular magnetic core, and the current of the coil 101 is detected through the current acquisition circuit 10; the main control circuit 20 is connected to the signal output end of the current collecting circuit 10, and the main control circuit 20 is used for outputting a corresponding digital signal according to the current detected by the current collecting circuit 10; the communication circuit 30 is connected between the main control circuit 20 and the upper computer 40, and is used for uploading the output digital signals of the main control circuit 20 to the upper computer 40. Further, the main control circuit 20 further includes an a/D conversion module, and the a/D conversion module is configured to convert an analog signal into a digital signal.
In the above embodiment, the power circuit 50 is further included, and the power circuit 50 is electrically connected to the main control circuit 20 and is used for providing electric energy for the current collecting circuit 10, the main control circuit 20 and the communication circuit 30 during operation.
Referring to fig. 4 and 5, for the current collecting circuit 10, in an embodiment of the present invention, the terminal a in fig. 4 is connected to the terminal B in fig. 5; in this embodiment, the current collecting circuit 10 includes an operational amplifier U5C, an operational amplifier U5D, an operational amplifier U5A, and an operational amplifier U5B; one end of the coil 101 is grounded, the other end of the coil is connected to the positive input end of the operational amplifier U5C, a capacitor C8 and a resistor R13 which are connected in series are arranged between the output end of the operational amplifier U5C and the negative input end of the operational amplifier U5D, and a resistor R15 is arranged between the positive input end of the operational amplifier U5D and the ground end; the output end of the operational amplifier U5D and the positive input end of the operational amplifier U5A are provided with a diode D4B, a resistor R16, a resistor R17 and a resistor R18 which are connected in series, the output end of the operational amplifier U5A is connected with the positive input end of the operational amplifier U5B, the negative input end of the operational amplifier U5B is connected with the output end of the operational amplifier U5B, a resistor R21 is arranged between the output end and the signal output end of the operational amplifier U5B, and a capacitor C14 is arranged between the signal output end and the ground end.
In this embodiment, referring to fig. 4 and 5, a resistor R8 is disposed between the inverting input terminal of the operational amplifier U5C and the ground, and a resistor R9 is disposed between the inverting input terminal of the operational amplifier U5C and the output terminal of the operational amplifier U5C. A diode D4A is arranged between the inverting input end of the operational amplifier U5D and the output end of the operational amplifier U5D; the common end between the capacitor C8 and the resistor R13 is a first common end, the common end between the resistor R16 and the resistor R17 is a second common end, a resistor R12 is arranged between the first common end and the second common end, and a resistor R14 is arranged between the inverting input end and the second common end of the operational amplifier U5D. A common end between the resistor R17 and the resistor R18 is a third common end, a capacitor C9 is arranged between the third common end and a grounding end, and a capacitor C10 is arranged between a positive input end of the operational amplifier U5A and the grounding end; the operational amplifier U5A has a positive power supply end and a negative power supply end, a capacitor C11 is arranged between the positive power supply end and the grounding end, and a capacitor C12 is arranged between the negative power supply end and the grounding end; a resistor R19 is arranged between the negative input end and the ground end of the operational amplifier U5A, and a capacitor C13 and a resistor R20 which are connected in parallel are arranged between the negative input end and the output end of the operational amplifier U5A.
For the power supply circuit 50, as shown in fig. 2 and 3, fig. 2 and 3 are respectively used for realizing positive power supply output and negative power supply output, and respectively comprise a power supply chip U1 and a power supply chip U2 for realizing the output of a positive power supply V + and a negative power supply V-.
Referring to fig. 6, for the main control circuit 20, according to a specific embodiment of the present invention, the main control circuit 20 includes a main control chip U4, and the main control chip U4 has a pin P1.2 connected to a signal output terminal, a signal output pin DIR, a signal output pin TXD, and a signal output pin RXD; referring to fig. 7, for the communication circuit 30, the present invention also provides an embodiment, the communication circuit 30 includes a communication chip U3, and the communication chip U3 has a signal receiving pin DIR, a signal receiving pin TXD and a signal receiving pin RXD.
Referring to fig. 8, the present invention further provides a microampere ac digital sensor, which includes a frame 601, an annular magnetic core 602 mounted on the frame 601, a coil 101 wound on the annular magnetic core 602, a circuit board 603 mounted on the frame 601, and a socket 604 on the circuit board 603; the micro-current detection circuit of the microampere-level alternating-current digital sensor is integrated on the circuit board 603. The framework is provided with a guide pin which is connected with a copper wire of the circuit board in a welding way, and the measured current signal is wound in the coil for multiple times to be amplified by multiple times; the socket is welded with the circuit board and is used for introducing a current signal to be measured and a digital signal output by the communication circuit and working voltage input in the power circuit.
Through the description, the utility model combines the mutual inductor principle, the digital circuit, the communication technology and other sciences, a measured signal is wound in the annular magnetic core for many times through the framework and the circuit board, a microampere-level alternating current signal is amplified for many times, a coil in the current acquisition circuit senses an alternating current signal according to the magnetic core, then the alternating current signal is amplified, rectified and filtered through the operational amplifier, an analog signal is output, the analog signal is converted into the digital signal through A/D conversion in the main control circuit, and the digital signal is output to the upper computer through the communication circuit according to the convention of a program; in addition, the sensor is small in size and simple to install, and the requirements of standardization and standardization of customers are met.
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 (10)
1. A micro-current detection circuit of a microampere alternating current digital sensor is characterized by comprising a current acquisition circuit, a master control circuit, a communication circuit and an upper computer;
the current acquisition circuit is provided with a signal input end and a signal output end, the signal input end comprises a coil wound on the annular magnetic core, and the current of the coil is detected through the current acquisition circuit;
the main control circuit is connected with the signal output end of the current acquisition circuit, and converts the signal output by the current acquisition circuit into a digital signal according to the program convention and outputs the digital signal;
the communication circuit is connected between the main control circuit and the upper computer and used for uploading the output of the main control circuit to the upper computer.
2. The micro-current detection circuit of a micro-amp-level alternating current digital sensor as claimed in claim 1, wherein the main control circuit further comprises an a/D conversion module for converting an analog signal into a digital signal.
3. The micro-current detection circuit of the micro-amp-level alternating current digital sensor as claimed in claim 1, further comprising a power circuit electrically connected to the main control circuit for providing power for the current collection circuit, the main control circuit and the communication circuit during operation.
4. The micro-current detection circuit of a micro-amp-level AC digital sensor as claimed in claim 1, wherein the current collection circuit comprises an operational amplifier U5C, an operational amplifier U5D, an operational amplifier U5A and an operational amplifier U5B;
one end of the coil is grounded, the other end of the coil is connected to the positive input end of an operational amplifier U5C, a capacitor C8 and a resistor R13 which are connected in series are arranged between the output end of the operational amplifier U5C and the negative input end of the operational amplifier U5D, and a resistor R15 is arranged between the positive input end of the operational amplifier U5D and the ground end;
the output end of the operational amplifier U5D and the positive input end of the operational amplifier U5A are provided with a diode D4B, a resistor R16, a resistor R17 and a resistor R18 which are connected in series, the output end of the operational amplifier U5A is connected with the positive input end of the operational amplifier U5B, the negative input end of the operational amplifier U5B is connected with the output end of the operational amplifier U5B, a resistor R21 is arranged between the output end and the signal output end of the operational amplifier U5B, and a capacitor C14 is arranged between the signal output end and the ground end.
5. The micro-current detection circuit of a micro-amp-level AC digital sensor as claimed in claim 4, wherein a resistor R8 is provided between the inverting input terminal of the operational amplifier U5C and the ground terminal, and a resistor R9 is provided between the inverting input terminal of the operational amplifier U5C and the output terminal of the operational amplifier U5C.
6. The micro-current detection circuit of a microampere-level alternating current digital sensor as claimed in claim 4, wherein a diode D4A is arranged between the inverting input terminal of the operational amplifier U5D and the output terminal of the operational amplifier U5D;
the common end between the capacitor C8 and the resistor R13 is a first common end, the common end between the resistor R16 and the resistor R17 is a second common end, a resistor R12 is arranged between the first common end and the second common end, and a resistor R14 is arranged between the inverting input end and the second common end of the operational amplifier U5D.
7. The micro-current detection circuit of a micro-amp-level AC digital sensor as claimed in claim 4, wherein the common terminal between the resistor R17 and the resistor R18 is a third common terminal, a capacitor C9 is disposed between the third common terminal and a ground terminal, and a capacitor C10 is disposed between the positive input terminal and the ground terminal of the operational amplifier U5A;
the operational amplifier U5A has a positive power supply end and a negative power supply end, a capacitor C11 is arranged between the positive power supply end and the grounding end, and a capacitor C12 is arranged between the negative power supply end and the grounding end;
a resistor R19 is arranged between the negative input end and the ground end of the operational amplifier U5A, and a capacitor C13 and a resistor R20 which are connected in parallel are arranged between the negative input end and the output end of the operational amplifier U5A.
8. The micro-current detection circuit of a micro-amp-level AC digital sensor as claimed in claim 4, wherein the main control circuit comprises a main control chip U4, and the main control chip U4 has a pin P1.2 connected to the signal output terminal, a signal output pin DIR, a signal output pin TXD and a signal output pin RXD;
the communication circuit comprises a communication chip U3, and the communication chip U3 is provided with a signal receiving pin DIR, a signal receiving pin TXD and a signal receiving pin RXD.
9. A microampere-level alternating current digital sensor is characterized by comprising a framework, an annular magnetic core arranged in the middle of the framework, a coil wound on the annular magnetic core, a circuit board arranged on the framework and a socket positioned on the circuit board;
the circuit board is integrated with a micro-current detection circuit of the microampere-level alternating current digital sensor as claimed in any one of claims 1 to 8.
10. A microampere-level ac digital sensor according to claim 9, wherein the bobbin is provided with a pin, the pin is connected with the copper wire of the circuit board by welding, and the measured current signal is wound in the coil for a plurality of times to amplify the measured current signal by a plurality of times;
the socket is welded with the circuit board and is used for introducing a current signal to be measured and a digital signal output by the communication circuit and working voltage input in the power circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122408466.3U CN216310106U (en) | 2021-09-30 | 2021-09-30 | Microampere alternating current digital sensor and micro-current detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122408466.3U CN216310106U (en) | 2021-09-30 | 2021-09-30 | Microampere alternating current digital sensor and micro-current detection circuit |
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| CN216310106U true CN216310106U (en) | 2022-04-15 |
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| CN202122408466.3U Active CN216310106U (en) | 2021-09-30 | 2021-09-30 | Microampere alternating current digital sensor and micro-current detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125134A (en) * | 2023-04-04 | 2023-05-16 | 北京中联太信科技有限公司 | Electrolytic cell current monitoring system and method |
-
2021
- 2021-09-30 CN CN202122408466.3U patent/CN216310106U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125134A (en) * | 2023-04-04 | 2023-05-16 | 北京中联太信科技有限公司 | Electrolytic cell current monitoring system and method |
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