CN217034090U - Internet of things sensor based on high-precision closed-loop current sensor - Google Patents
Internet of things sensor based on high-precision closed-loop current sensor Download PDFInfo
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- CN217034090U CN217034090U CN202123160710.5U CN202123160710U CN217034090U CN 217034090 U CN217034090 U CN 217034090U CN 202123160710 U CN202123160710 U CN 202123160710U CN 217034090 U CN217034090 U CN 217034090U
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Abstract
The utility model discloses an Internet of things sensor based on a high-precision closed-loop current sensor, which is used for remotely transmitting current data and comprises a current detection device and an Internet of things transmission device, wherein the output end of the current detection device is electrically connected with the input end of the Internet of things transmission device, the current detection device comprises a magnetic core N1, a magnetic core N2, a magnetic core N3 and a compensation coil Ns, and a lead with a primary current Ip sequentially penetrates through the magnetic core N3, the magnetic core N2 and the magnetic core N1. According to the Internet of things sensor based on the high-precision closed-loop current sensor, the current detected by the current detection device is transmitted to the terminal through the Internet of things transmission device, a series of functions such as equipment networking, remote control and remote data acquisition can be completed through an Internet of things chip, and the Internet of things sensor has multi-scene use requirements.
Description
Technical Field
The utility model belongs to the technical field of current sensors, and particularly relates to an Internet of things sensor based on a high-precision closed-loop current sensor.
Background
The current sensor is a detection device which can sense the information of the current to be detected and convert the sensed information into an electric signal meeting certain standard requirements or other required information output according to a certain rule so as to meet the requirements of information transmission, processing, storage, display, record, control and the like.
However, the existing current sensor has the following disadvantages:
1. real-time current data cannot be remotely checked;
2. a plurality of devices cannot be networked to check the use condition of each node;
3. the wired connection causes limitation of installation scenes, and cannot be applied to multiple scenes.
Therefore, the above problems are further improved.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims to provide an Internet of things sensor based on a high-precision closed-loop current sensor, which transmits current detected by a current detection device to a terminal through an Internet of things transmission device, can complete a series of functions such as equipment networking, remote control and remote data acquisition through an Internet of things chip, and has multi-scene use requirements.
In order to achieve the above object, the present invention provides an internet of things sensor based on a high-precision closed-loop current sensor, which is used for remotely transmitting current data, and includes a current detection device and an internet of things transmission device, wherein an output end of the current detection device is electrically connected with an input end of the internet of things transmission device, and wherein:
the current detection device comprises a magnetic core N1, a magnetic core N2 (the magnetic core N1 and the magnetic core N2 form a direct current excitation and detection coil), a magnetic core N3 (which Is used as an alternating current coil) and a compensation coil Ns, wherein a lead with a primary current Ip sequentially penetrates through the magnetic core N3, the magnetic core N2 and the magnetic core N1, the compensation coil Ns Is wound on the magnetic core N1, the magnetic core N2 and the magnetic core N3, and an output end of the compensation coil Ns outputs a compensation current Is;
the transmission device of the internet of things comprises a sampling resistor Rm, an operational amplifier PA, an analog-to-digital converter ADC, a single chip microcomputer MCU (comprising STM32 series) and an internet of things transmission chip, wherein the input end of the operational amplifier PA Is connected with a compensation current Is through the sampling resistor RM, the output end of the operational amplifier PA Is electrically connected with the input end of the analog-to-digital converter ADC, the output end of the analog-to-digital converter ADC Is electrically connected with the input end of the single chip microcomputer MCU, and the communication end of the single chip microcomputer MCU Is electrically connected with the internet of things transmission chip (the data which Is finally obtained by sampling and Is equal to the current value of the primary current Ip Is transmitted to a terminal through the internet of things transmission chip).
As a further preferable technical solution of the above technical solution, one end of the sampling resistor Rm is electrically connected to the positive input end of the operational amplifier PA through a resistor R1, the other end of the sampling resistor Rm is electrically connected to the negative input end of the operational amplifier PA through a resistor R2, a resistor R3 is connected between the positive input end and the output end of the operational amplifier PA, and the negative input end of the operational amplifier PA is connected to the ground end of the analog-to-digital converter ADC through a resistor R4.
As a further preferred technical solution of the above technical solution, the output end of the magnetic core N3 is electrically connected to the input end of the operational amplifier P1 through a capacitor C1, the output end of the operational amplifier P1 is connected to the signal processor U1, the output ends of the magnetic core N1 and the magnetic core N2 are respectively electrically connected to the input end of the operational amplifier P2, the output end of the operational amplifier P2 is connected to the signal processor U1, and the output end of the signal processor U1 is connected to the compensation coil Ns through the operational amplifier P3.
As a further preferred technical scheme of the above technical scheme, the transmission chip of the internet of things comprises an NB-IOT chip, an LORA chip, a Bluetooth chip, a 4G chip, a CAN bus and an RS485 bus.
As a further preferable embodiment of the above-described embodiment, the core N3 receives ac power, and the cores N1 and N2 receive dc power.
The utility model has the beneficial effects that:
1. manpower resources are saved, and people do not need to go to the site to read data;
2. multiple devices are automatically networked, and troubleshooting and analysis are convenient;
3. the application and installation environment of the chip of the Internet of things is unlimited.
Drawings
Fig. 1 is a schematic diagram of an internet of things sensor based on a high-precision closed-loop current sensor.
Fig. 2 is a schematic diagram of the internet of things sensor based on the high-precision closed-loop current sensor.
Detailed Description
The following description is presented to disclose the utility model so as to enable any person skilled in the art to practice the utility model. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the utility model, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the utility model.
The utility model discloses an internet of things sensor based on a high-precision closed-loop current sensor, and the specific embodiment of the utility model is further described by combining the preferred embodiment.
In the embodiment of the present invention, those skilled in the art note that the single chip microcomputer, the signal processor, and the like related to the present invention may be regarded as the prior art.
Preferred embodiments.
The utility model discloses an Internet of things sensor based on a high-precision closed-loop current sensor, which is used for remotely transmitting current data and comprises a current detection device and an Internet of things transmission device, wherein the output end of the current detection device is electrically connected with the input end of the Internet of things transmission device, and the current detection device comprises:
the current detection device comprises a magnetic core N1, a magnetic core N2 (the magnetic core N1 and the magnetic core N2 form a direct current excitation and detection coil), a magnetic core N3 (serving as an alternating current coil) and a compensation coil Ns, wherein a lead with a primary current Ip sequentially penetrates through the magnetic core N3, the magnetic core N2 and the magnetic core N1, the compensation coil Ns Is wound on the magnetic core N1, the magnetic core N2 and the magnetic core N3, and an output end of the compensation coil Ns outputs a compensation current Is;
the transmission device of the internet of things comprises a sampling resistor Rm, an operational amplifier PA, an analog-to-digital converter ADC, a single chip microcomputer MCU (comprising STM32 series) and an internet of things transmission chip, wherein the input end of the operational amplifier PA Is connected with a compensation current Is through the sampling resistor RM, the output end of the operational amplifier PA Is electrically connected with the input end of the analog-to-digital converter ADC, the output end of the analog-to-digital converter ADC Is electrically connected with the input end of the single chip microcomputer MCU, and the communication end of the single chip microcomputer MCU Is electrically connected with the internet of things transmission chip (the finally obtained through sampling Is transmitted to a terminal through the internet of things transmission chip and data equal to the current value of the primary current Ip Is transmitted to the terminal).
Specifically, one end of the sampling resistor Rm is electrically connected to the positive input end of the operational amplifier PA through a resistor R1, the other end of the sampling resistor Rm is electrically connected to the negative input end of the operational amplifier PA through a resistor R2, a resistor R3 is connected between the positive input end and the output end of the operational amplifier PA, and the negative input end of the operational amplifier PA is connected to the ground end of the analog-to-digital converter ADC through a resistor R4.
More specifically, the output end of the magnetic core N3 is electrically connected to the input end of the operational amplifier P1 through a capacitor C1, the output end of the operational amplifier P1 is connected to a signal processor U1 (alternating current or direct current can be selectively transmitted), the output ends of the magnetic core N1 and the magnetic core N2 are respectively electrically connected to the input end of the operational amplifier P2, the output end of the operational amplifier P2 is connected to a signal processor U1, and the output end of the signal processor U1 is connected to the compensation coil Ns through an operational amplifier P3.
Further, the transmission chip of the internet of things comprises an NB-IOT chip, an LORA chip, a Bluetooth chip, a 4G chip, a CAN bus and an RS485 bus.
Furthermore, the magnetic core N3 inputs alternating current, and the magnetic core N1 and the magnetic core N2 input direct current.
The principle of the utility model is as follows:
by combining the excitation magnetic flux closed-loop control technology, the self-excitation fluxgate technology and the multi-closed-loop control technology, zero magnetic flux closed-loop control over excitation magnetic flux, direct current magnetic flux and alternating current magnetic flux and a zero balance or zero magnetic flux method (feedback system) are realized, and the magnetic flux in the magnetic core of the sensor is ensured to be always controlled at zero. The amount of current required to balance the zero flux is equal to the amount of primary current through the conductor multiplied by the turns ratio of the primary and secondary coils.
The N1 and N2 magnetic cores form a direct current excitation and detection coil, and the N3 magnetic core is an alternating current coil and directly induces an alternating current signal. The Ns magnetic core Is a compensation coil, and the magnitude of the primary current Ip Is detected by outputting an Is current value.
The sensor can complete equipment networking, remote control, remote data acquisition and the like through an Internet of things chip
The system has a series of functions and meets the use requirements of multiple scenes. The chip of the Internet of things comprises: NB-IOT, LORA, Bluetooth, 4G, CAN bus and RS485 bus.
N1, N2 and N3 are three magnetic cores, Ns Is a compensation wire, Ip Is a primary current, and Is an induction current with the same value as the primary current.
It should be noted that the technical features of the single chip microcomputer, the signal processor, and the like related to the patent application of the present invention should be regarded as the prior art, and the specific structure, the operation principle, the control mode and the spatial arrangement mode of the technical features may be conventional choices in the field, and should not be regarded as the utility model point of the patent of the present invention, and the patent of the present invention is not further specifically described.
It will be apparent to those skilled in the art that modifications and equivalents can be made to the embodiments described above, or some features of the embodiments described above, and any modifications, equivalents, improvements, and the like, which fall within the spirit and principle of the present invention, are intended to be included within the scope of the present invention.
Claims (5)
1. The utility model provides an thing networking sensor based on high accuracy closed loop current sensor for teletransmission current data, its characterized in that, including current detection device and thing networking transmission device, current detection device's output with thing networking transmission device's input electric connection, wherein:
the current detection device comprises a magnetic core N1, a magnetic core N2, a magnetic core N3 and a compensation coil Ns, wherein a lead with a primary current Ip sequentially penetrates through the magnetic core N3, the magnetic core N2 and the magnetic core N1, the compensation coil Ns Is wound on the magnetic core N1, the magnetic core N2 and the magnetic core N3, and an output end of the compensation coil Ns outputs a compensation current Is;
the transmission device of the internet of things comprises a sampling resistor Rm, an operational amplifier PA, an analog-to-digital converter ADC, a single chip microcomputer MCU and a transmission chip of the internet of things, wherein the input end of the operational amplifier PA Is connected with a compensation current Is through the sampling resistor RM, the output end of the operational amplifier PA Is electrically connected with the input end of the analog-to-digital converter ADC, the output end of the analog-to-digital converter ADC Is electrically connected with the input end of the single chip microcomputer MCU, and the communication end of the single chip microcomputer MCU Is electrically connected with the transmission chip of the internet of things.
2. The sensor of the internet of things based on the high-precision closed-loop current sensor as claimed in claim 1, wherein one end of the sampling resistor Rm is electrically connected to a positive input end of the operational amplifier PA through a resistor R1, the other end of the sampling resistor Rm is electrically connected to a negative input end of the operational amplifier PA through a resistor R2, a resistor R3 is connected between the positive input end and the output end of the operational amplifier PA, and the negative input end of the operational amplifier PA is connected to a ground end of the analog-to-digital converter ADC through a resistor R4.
3. The sensor of the internet of things based on the high-precision closed-loop current sensor as claimed in claim 2, wherein an output end of the magnetic core N3 is electrically connected with an input end of an operational amplifier P1 through a capacitor C1, an output end of the operational amplifier P1 is connected to a signal processor U1, an output end of the magnetic core N1 and an output end of the magnetic core N2 are respectively electrically connected with an input end of an operational amplifier P2, an output end of the operational amplifier P2 is connected to a signal processor U1, and an output end of the signal processor U1 is connected to the compensation coil Ns through an operational amplifier P3.
4. The sensor of the internet of things based on the high-precision closed-loop current sensor as claimed in claim 3, wherein the transmission chip of the internet of things comprises an NB-IOT chip, an LORA chip, a Bluetooth chip, a 4G chip, a CAN bus and an RS485 bus.
5. The Internet of things sensor based on the high-precision closed-loop current sensor as claimed in claim 4, wherein the magnetic core N3 inputs alternating current, and the magnetic core N1 and the magnetic core N2 input direct current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123160710.5U CN217034090U (en) | 2021-12-15 | 2021-12-15 | Internet of things sensor based on high-precision closed-loop current sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123160710.5U CN217034090U (en) | 2021-12-15 | 2021-12-15 | Internet of things sensor based on high-precision closed-loop current sensor |
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| CN217034090U true CN217034090U (en) | 2022-07-22 |
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| CN202123160710.5U Active CN217034090U (en) | 2021-12-15 | 2021-12-15 | Internet of things sensor based on high-precision closed-loop current sensor |
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