CN213457103U - Non-contact current measuring device - Google Patents
Non-contact current measuring device Download PDFInfo
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- CN213457103U CN213457103U CN202021347642.6U CN202021347642U CN213457103U CN 213457103 U CN213457103 U CN 213457103U CN 202021347642 U CN202021347642 U CN 202021347642U CN 213457103 U CN213457103 U CN 213457103U
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Abstract
The utility model discloses a non-contact current measuring device, aiming at the defects of time consumption for installation and power-off installation, on the basis of the prior art, a sensor acquisition module is added for connecting with a non-contact current sensor or a current transformer, converting a differential signal input by a sensor interface into a single-ended signal, and obtaining an analog current signal through an LF low-pass filter and sending the analog current signal to an ARM processor; meanwhile, the power supply module is improved to provide positive voltage, negative voltage and reference voltage for the sensor acquisition module, so that the sensor acquisition module is combined with the non-contact current sensor to acquire current. Like this, under the condition of guaranteeing measurement accuracy, realize on-the-spot "not outage", "do not break" quick installation, can also use traditional current transformer to detect simultaneously, conveniently carry out data acquisition to the equipment of having installed current transformer, reduce use cost.
Description
Technical Field
The utility model belongs to the technical field of electric power system electric quantity collection, more specifically say, relate to a non-contact current measurement device, need adopt non-contact measuring device when can be applied to special environment current measurement promptly.
Background
With the development of science and technology and the progress of big data technology, departments such as electric power and environmental protection need to monitor the power consumption state of power consumption main bodies such as enterprises and individuals, and the analysis of information such as the power consumption state, the power consumption behavior and the power consumption characteristics of the power consumption main bodies is realized.
At present, in the installation process of a conventional electric power system electric quantity collector on the market, because a traditional current transformer is used as a sensor for current collection, the point position to be installed needs to be subjected to switching-off and power-off during installation, the installation process is complicated, the consumed time is long, and the installation and debugging are required to be carried out for 60-120 minutes according to different environments. If a plurality of point locations need to be installed, the normal operation of an enterprise is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of current measuring device in the installation, provide a non-contact current measuring device, not only can use supporting non-contact current sensor, can also use traditional current transformer to detect, conveniently carry out data acquisition to the equipment that has installed current transformer, reduce use cost.
In order to realize the above object of the present invention, the utility model discloses non-contact current measuring device, include:
the ARM processor (MCU) is internally provided with an ADC module for carrying out digital-to-analog conversion on the analog current signal to obtain a digital current signal, the digital current signal is converted into a frequency domain signal from a time domain signal after being calculated by an internal DSP core of the ARM processor, and the current intensity induced by the sensor is calculated through the amplitude-frequency characteristic of the frequency domain signal and the linear characteristic of the sensor to complete current measurement;
the power supply module is used for converting an alternating current power supply into a 12V direct current power supply;
the DC-DC voltage reduction module is used for reducing the voltage of the 12V direct current power supply into a 5V direct current power supply and providing the 5V direct current power supply as a power supply for the ARM processor;
it is characterized by also comprising:
the sensor acquisition module is provided with 4 sensor interfaces and can be inserted with 4 non-contact current sensors or 4 current transformers; the sensor acquisition module is connected with 4 inserted non-contact current sensors or 4 inserted current transformers through 4 sensor interfaces, converts differential signals input by the sensor interfaces into single-ended signals, obtains analog current signals through an LF low-pass filter and sends the analog current signals to the ARM processor;
the power module further includes:
the charge pump negative voltage conversion module is used for converting the 12V direct-current power supply into negative voltage and providing the negative voltage for the sensor acquisition module;
the LDO linear power supply module is used for converting a 12V direct-current power supply into positive voltage required by the sensor acquisition module;
and the reference voltage source module is used for converting the 12V direct-current power supply into the reference voltage required by the sensor acquisition module.
The purpose of the utility model is realized like this.
The utility model discloses non-contact current measuring device, to the shortcoming that the installation is consuming time and need the outage installation, on prior art basis, increased sensor acquisition module for be connected with non-contact current sensor or current transformer, convert the differential signal of sensor interface input into single-ended signal, via LF low pass filter, obtain analog current signal and send to ARM treater; meanwhile, the power supply module is improved to provide positive voltage, negative voltage and reference voltage for the sensor acquisition module, so that the sensor acquisition module is combined with the non-contact current sensor to acquire current. Therefore, under the condition of ensuring the measurement precision, the rapid installation of 'uninterrupted power supply' and 'non-switching-off' on site is realized, the normal work of construction enterprises is not influenced, the average installation and debugging takes 10-20 minutes, and the rapid construction requirement is better met compared with the traditional electric quantity measuring meter. And simultaneously, the utility model discloses can also use traditional current transformer to detect, conveniently carry out data acquisition to the equipment of having installed current transformer, reduce use cost.
Drawings
FIG. 1 is a schematic diagram of a specific embodiment of a non-contact current measuring device according to the present invention;
FIG. 2 is a schematic top view of the non-contact current measuring device shown in FIG. 1;
FIG. 3 is a schematic top side view of the non-contact current measuring device of FIG. 1;
FIG. 4 is a schematic view of the non-contact current measuring device shown in FIG. 1;
labeled as: 1. the device comprises a power supply module, a 2 ARM processor, a 3 Bluetooth communication module, a 4 NB-loT communication module, a 5 sensor acquisition module, a 6 key module, a 7 clock module, a 8 anti-disassembly detection module, a 9 AC-DC power supply module, a 10 battery charging management module, a 11 battery module, a 12 power supply switching module, a 13 DC-DC voltage reduction module, a 14 charge pump negative pressure conversion module, a 15 LDO linear power supply module, a 16 reference voltage source module, a 17 shell, an 18 indicator light module, a 19 power supply interface, a 20 antenna interface, and a 21 sensor interface.
Detailed Description
The following description of the present invention will be provided in conjunction with the accompanying drawings to enable those skilled in the art to better understand the present invention. It is to be expressly noted that in the following description, detailed descriptions of known functions and designs will be omitted when they may obscure the main contents of the present invention.
Fig. 1 is a schematic diagram of a specific embodiment of the non-contact current measuring device of the present invention.
In this embodiment, as shown in fig. 1, the utility model discloses non-contact current measuring device, including casing 17, casing 17 internal fixation is provided with power module 1, ARM treater 2, bluetooth communication module 3, NB-loT communication module 4, sensor acquisition module 5, button module 6, clock module 7 and prevents tearing open detection module 8. The power module 1 includes an AC-DC power module 9, a battery charging management module 10, a battery module 11, a power supply switching module 12, a DC-DC voltage reduction module 13, a charge pump negative voltage conversion module 14, an LDO linear power module 15, and a reference voltage source module 16.
The AC-DC power module 9 can convert 85-305V (43-67Hz) AC power into 12V DC power, the battery charging management module 10 charges 11 the internal battery module, and the reliable power is provided for each module of the whole non-contact current measuring device through the DC-DC voltage reduction module 13, the charge pump negative voltage conversion module 14, the LDO linear power module 15 and the reference voltage source module 16. The DC-DC voltage reduction module 13 reduces the voltage of a 12V direct-current power supply into a 5V direct-current power supply, the reduced voltage is provided for the ARM processor as a power supply, the charge pump negative voltage conversion module 14 converts the 12V direct-current power supply into a negative voltage and provides the negative voltage for the sensor acquisition module 5, the LDO linear power supply module 15 converts the 12V direct-current power supply into a positive voltage required by the sensor acquisition module 5, and the reference voltage source module 16 converts the 12V direct-current power supply into a reference voltage required by the sensor acquisition module 5, so that the sensor acquisition module 5 is combined with a non-contact current sensor to acquire current.
In this embodiment, the power supply switching module 12 is connected to the ARM processor 2, and can automatically identify whether the external power supply is normal, and if the external power supply is normal, the device will automatically switch to the external power supply; if the external power supply is abnormal, the device can be automatically switched to the battery module 11 to provide power for the system. And through the software and hardware design, the system is automatically started when external power supply conditions exist; when only the battery module 11 supplies power, the system needs to be started by touching the start key in the key module 6; when the device needs to be shut down, the external power supply is removed, and the shutdown key in the key module 6 is touched lightly, so that the shutdown of the device can be realized. The clock module 7 is connected to the ARM processor 2 and provides a system clock and an RTC real-time clock for the non-contact current measuring device. The sensor acquisition module 5 is connected on the ARM processor 2, converts the differential signal of sensor interface input into single-ended signal, and via LF low pass filter, the ADC module that transmits analog signal to ARM processor 2 inside converts digital signal into, through the inside DSP core calculation of ARM processor 2, changes the time domain signal who gathers into frequency domain signal, through the amplitude-frequency characteristic of signal and the linear characteristic of sensor, calculates the current strength of sensor response. The processing of the digital signal by the ARM processor belongs to the prior art, and the specific processing process is not described again.
In this embodiment, the bluetooth communication module 3 and the NB-loT communication module 4 are connected to the ARM processor 2, and in a wireless communication manner, the non-contact current measurement device is communicated with a bluetooth terminal (such as a mobile phone or other device having a bluetooth communication function) and cloud data, and current data collected by the device is sent to the bluetooth device or the cloud platform. The tamper-proof detection module 8 is connected to the ARM processor 2, and when the non-contact current measuring device is normally operated, if the non-contact current measuring device is separated from the installation surface, as shown in fig. 2, the indicator light module 18 lights up a yellow indicator light, and informs a user of a tamper signal through the bluetooth communication module 3 and the NB-loT communication module 4.
In this embodiment, the key module 6 is disposed on the left side of the housing 17, which is convenient for the user to operate. Meanwhile, as shown in fig. 3, a power interface 19 and an antenna interface 20 are provided on the upper side of the housing 17, and a power source and an antenna can be inserted when in use. As shown in fig. 4, 4 sensor interfaces 21 are provided on the lower side of the housing 17, and 4 noncontact current sensors can be inserted.
The utility model discloses non-contact current measuring device's advantage lies in:
1. the measurement functions of a non-contact current sensor and a current transformer are integrated;
2. the device can automatically identify different sensors (non-contact current sensors and various current transformers);
3. the power consumption of the whole equipment is low, and the maximum power consumption is less than or equal to 2.8W during charging;
4. the working voltage is wide, the device can work under the conditions of 85-305 VAC (47-63Hz) or 120-430 VDC, and is suitable for power supply in various measuring environments;
5. the installation without power failure in a power supply place can be realized, and the normal work of an installation enterprise is not influenced;
6. adopt card rail formula and magnetism to inhale formula mounting means, the installation is swift convenient, has greatly reduced installation time.
7. Compared with Bluetooth 2.0 equipment in traditional equipment, the near field communication Bluetooth 4.0 data transparent transmission technology is adopted, so that the power is saved, the cost is low, the delay is low, and the effective communication distance is overlong;
8. the communication mode of the narrow-band technology NB-loT low-power consumption wide area network (LPWAN) is adopted, and the method has the characteristics of wide coverage, more connections, high speed, low cost, low power consumption, excellent framework and the like.
Although illustrative embodiments of the invention have been described above to facilitate the understanding of the invention by those skilled in the art, it should be understood that the invention is not limited to the scope of the embodiments, and that various changes may be apparent to those skilled in the art without departing from the spirit and scope of the invention as defined and defined in the appended claims.
Claims (2)
1. A non-contact current measuring device comprising:
the ARM processor (MCU) is internally provided with an ADC module for carrying out digital-to-analog conversion on the analog current signal to obtain a digital current signal, the digital current signal is converted into a frequency domain signal from a time domain signal after being calculated by an internal DSP core of the ARM processor, and the current intensity induced by the sensor is calculated through the amplitude-frequency characteristic of the frequency domain signal and the linear characteristic of the sensor to complete current measurement;
the power supply module is used for converting an alternating current power supply into a 12V direct current power supply;
the DC-DC voltage reduction module is used for reducing the voltage of the 12V direct current power supply into a 5V direct current power supply and providing the 5V direct current power supply as a power supply for the ARM processor;
it is characterized by also comprising:
the sensor acquisition module is provided with 4 sensor interfaces and can be inserted with 4 non-contact current sensors or 4 current transformers; the sensor acquisition module is connected with 4 inserted non-contact current sensors or 4 inserted current transformers through 4 sensor interfaces, converts differential signals input by the sensor interfaces into single-ended signals, obtains analog current signals through an LF low-pass filter and sends the analog current signals to the ARM processor;
the power module further includes:
the charge pump negative voltage conversion module is used for converting the 12V direct-current power supply into negative voltage and providing the negative voltage for the sensor acquisition module;
the LDO linear power supply module is used for converting a 12V direct-current power supply into positive voltage required by the sensor acquisition module;
and the reference voltage source module is used for converting the 12V direct-current power supply into the reference voltage required by the sensor acquisition module.
2. The non-contact current measuring device of claim 1, wherein a power interface and an antenna interface are arranged on the upper side of the casing of the device, and a power supply and an antenna can be inserted in use; 4 sensor interfaces are arranged on the lower side of the shell, and 4 non-contact current sensors can be inserted into the sensor interfaces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347642.6U CN213457103U (en) | 2020-07-10 | 2020-07-10 | Non-contact current measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021347642.6U CN213457103U (en) | 2020-07-10 | 2020-07-10 | Non-contact current measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213457103U true CN213457103U (en) | 2021-06-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021347642.6U Active CN213457103U (en) | 2020-07-10 | 2020-07-10 | Non-contact current measuring device |
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|---|---|
| CN (1) | CN213457103U (en) |
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2020
- 2020-07-10 CN CN202021347642.6U patent/CN213457103U/en active Active
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