CN114325060A - Current sensor system - Google Patents
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Abstract
The invention provides a current sensor system, and belongs to the technical field of current sensors. The system comprises an electromagnetic coil and a Rogowski coil, wherein the electromagnetic coil and the Rogowski coil are used for penetrating on a line to be measured; the Rogowski coil is connected with the signal processing module and used for sending the sensed signal to the signal processing module, and the signal processing module is used for amplifying and integrating the sensed current; the electromagnetic coil is connected with the battery management module and used for converting the electric energy acquired by the battery management module and supplying power to the signal processing module and the main control module through the converted electric energy; the main control module is used for processing and outputting the signals output by the signal processing module. The invention adopts the electromagnetic coil to take electricity and adopts the Rogowski coil to detect current, thereby properly reducing the volume of the electromagnetic coil, optimizing the size of the current sensor, avoiding the problems of easy saturation of the magnetic field of the electromagnetic coil and narrower frequency band, and improving the current measurement precision.
Description
Technical Field
The invention relates to a current sensor system, and belongs to the technical field of current sensors.
Background
As an apparatus for detecting electric energy of an electric power system, a current sensor has been increasingly required to have a high detection accuracy along with the development of power electronics technology. In the prior art, an electromagnetic transformer is mainly used for current detection, and the electromagnetic transformer can detect current and can also get electricity, for example, in a patent entitled "a method and a system for acquiring power data based on an electromagnetic induction type wireless transmission transformer" in application publication No. CN113472086A, a current signal and a voltage signal of a power system are acquired by the electromagnetic induction type wireless transmission transformer, and a required power supply is provided by a secondary winding of the electromagnetic voltage transformer. The electromagnetic current transformer consists of a closed iron core and a winding wound on the iron core, and the thickness of the iron core and the number of turns of the winding directly influence the measurement precision. When the thickness of the iron core and the number of turns of the winding meet certain requirements, the measurement accuracy is high, but a large space is occupied. In order to meet the requirement of measurement accuracy, the general electromagnetic coils are large in size, the electromagnetic frequency band is narrow, and the magnetic circuit of the iron core is easy to saturate under large current, so that large errors can be caused to measurement results.
Disclosure of Invention
The invention aims to provide a current sensor system to solve the problems of large volume and low measurement accuracy of the existing electromagnetic current sensor.
The invention provides a current sensor system, which comprises an electromagnetic coil and a Rogowski coil, wherein the electromagnetic coil and the Rogowski coil are used for being arranged on a line to be measured in a penetrating way; the Rogowski coil is connected with the signal processing module and used for sending the sensed signal to the signal processing module, and the signal processing module is used for amplifying and integrating the sensed current; the electromagnetic coil is connected with the battery management module and used for converting the electric energy acquired by the battery management module and supplying power to the signal processing module and the main control module through the converted electric energy; the main control module is used for processing and outputting the signals output by the signal processing module.
The current sensor system provided by the invention comprises the electromagnetic coil and the Rogowski coil, the electromagnetic coil is used for taking electricity, the Rogowski coil is used for detecting current, the volume of the electromagnetic coil can be properly reduced, the size of the current sensor is optimized, the problems that the magnetic field of the electromagnetic coil is easy to saturate and the frequency band is narrow are solved, the current measurement precision is improved, and the signal processing and digitization functions are realized through the signal processing module and the main control module.
Further, in order to improve the power supply performance of the battery management module, the sensor system further comprises a rectifier, wherein the alternating current side of the rectifier is connected with the electromagnetic coil, and the direct current side of the rectifier is connected with the battery management module and used for converting alternating current induced by the electromagnetic coil into direct current.
Furthermore, in order to realize the conversion between the analog signal and the digital signal, the sensor system further comprises an analog-to-digital conversion module, wherein the input end of the analog-to-digital conversion module is connected with the output end of the signal processing module, the output end of the analog-to-digital conversion module is connected with the main control module and is used for converting the analog signal output by the signal processing module into the digital signal, and the analog-to-digital conversion module is powered by the power management module.
Further, in order to realize amplification and integration processing of the signal, the signal processing module includes a first amplification circuit and an integration circuit, the amplification circuit includes a second amplifier for performing amplification processing on the current signal, and the integration circuit includes an amplifier for performing integration reduction processing on the current amplification signal to obtain a current reduction signal.
Furthermore, in order to realize flexible output of signals, the main control module is also connected with a signal conversion module, and signals are output through the signal conversion module.
Furthermore, in order to improve the anti-electromagnetic interference capability of the output signal, the signal conversion module is a photoelectric coupler, the input side of the photoelectric coupler is connected with the output end of the main control module, and the output side of the photoelectric coupler is used for being connected with the interface module, so that the electromagnetic isolation between the main control module and the interface module is realized.
Furthermore, the signal conversion module comprises a digital-to-analog conversion circuit, a signal amplification circuit and a radio frequency following circuit which are connected in sequence, wherein the input end of the digital-to-analog conversion circuit is connected with the output end of the main control module, and the output end of the digital-to-analog conversion circuit outputs a corresponding voltage signal after being amplified and followed by the signal amplification circuit and the radio frequency following circuit.
Furthermore, the signal conversion module is a digital-to-analog conversion circuit, an input end of the digital-to-analog conversion circuit is connected with an output end of the main control module, and an output end of the digital-to-analog conversion circuit is used for being connected with the interface module so as to convert a digital signal output by the main control module into an analog current signal and send the analog current signal to the interface module.
The signal conversion module can select different output modes according to different use environments, so that the interference of the external environment on the signals is avoided as much as possible, and the output signals are better detected by a subsequent module.
Further, in order to realize the switching of different output signals, the signal conversion module further comprises a switch for realizing the switching of different signal output modes of the signal conversion module.
Further, the electromagnetic coil and the Rogowski coil are stacked in a concentric circle mode.
Drawings
FIG. 1 is a circuit diagram of a current sensor system of the present invention;
FIG. 2 is a schematic diagram of the current sensor system;
FIG. 3 is a schematic view of the electromagnetic coil and Rogowski coil mounting;
FIG. 4 is a schematic diagram of a signal processing module;
FIG. 5 is a waveform diagram of a Rogowski coil sampling signal;
fig. 6 is a diagram of a power management module structure.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The present invention proposes a current sensor system, as shown in fig. 1 and 2, which includes an electromagnetic coil and a rogowski coil. As shown in fig. 1, the dark ring represents an electromagnetic coil, the light ring represents a rogowski coil, and a wire to be tested passes through the electromagnetic coil and the rogowski coil; the Rogowski coil is connected with a signal processing module (Single Condition), and the acquired signal is amplified and integrated by the signal processing module; the electromagnetic coil is connected with a battery Management module (Power Management), and supplies Power to the signal processing module and the main control module (Processor) through the battery Management module; the main control module is used for processing and outputting the signals output by the signal processing module.
The existing electromagnetic coil can be used for obtaining electricity and detecting current signals, the invention only adopts the electromagnetic coil to obtain electricity and adopts the Rogowski coil to detect the current signals, and under the condition, the thickness of an iron core and the number of turns of a winding of the electromagnetic coil can be properly reduced, so that the volume of the electromagnetic coil is reduced, the size of a current sensor is further optimized, and the problems of narrow frequency band of the electromagnetic coil and low measurement precision caused by easy saturation under large current are avoided.
In the present embodiment, three electromagnetic coils and three rogowski coils are provided, the electromagnetic coils and the rogowski coils are all insulated and packaged, and are stacked in a concentric circle manner, as shown in fig. 3, the rogowski coils are integrally cast and fixed in grooves provided in an integrated base after the upper electromagnetic coils and the lower electromagnetic coils are lowered, the cast electromagnetic coils and the rogowski coils can form a measurement power-taking module, in the present embodiment, three sets of measurement power-taking modules are formed, and measurement power-taking is performed on A, B, C three circuits.
As shown in fig. 1, the sensor system further includes a Rectifier (Rectifier), wherein an ac side of the Rectifier is connected to the electromagnetic coil, and a dc side of the Rectifier is connected to the battery management module, so as to convert ac power sensed by the electromagnetic coil into dc power, and for the requirements of different module voltages, as shown in fig. 1 and 2, the signal processing module, the main control module, and the signal conversion module can output corresponding voltages through the battery management module to power the modules. The battery management module is also connected with a battery as a backup power supply. The current sensor system also comprises an analog-to-digital conversion module (ADC), wherein the input end of the ADC is connected with the output end of the signal processing module, the output end of the ADC is connected with the main control module and used for converting the analog signal output by the signal processing module into a digital signal, and the ADC is also powered by the power management module.
The power management module adopts a structure as shown in fig. 6, and comprises an input circuit, a power management chip, a periphery, a backup super capacitor and a battery. When large current passes through the primary side of the input circuit, because the maximum peak current input by the whole power management module (PMU) is limited, the redundant current needs to be discharged by a proper discharge path so as to ensure the reliability and stability of the whole current design. Therefore, a plurality of diodes with low leakage current and high conduction voltage drop need to be connected in parallel at the input end of a Power Management Unit (PMU), and meanwhile, the diodes with large forward conduction peak current are discharged when the input generates large current, and D5-D8 in the circuit plays a role in discharging large current, wherein R28-R30 play a role in voltage sharing. Then, the VIN voltage is input into a power management chip U1, the power management chip is a chip with model number ADP5091, wherein capacitors C13, R13, R18, R23 and R24 jointly determine a Maximum Power Point Tracking (MPPT) of the power management module, specifically, after the U1 chip inputs open-circuit voltage through periodic sampling and divides the voltage, the voltage is used as the maximum power point tracking to perform constant-voltage maximum power point tracking, and then the voltage of the maximum power point is stored through a C13 capacitor of a CBP pin and used for adjusting the input voltage of the U1 chip in real time. The maximum tracking point voltage is determined by the ratio of the sum of R13, R18 to the sum of R13, R18, R23, R24. The peripheral devices R25, R26 and R27 of the U1 chip jointly determine the working mode in the U1, a PGOOD pin is connected with a micro control pin and can also play a role in monitoring the power management chip U1, and when the voltage output exceeds the regulation range, the voltage-stabilized output is controlled; the resistor R3 of the VID pin is used for setting the output voltage of the U1 chip, the inductor L1 is used for setting the switching node of the inductive boost regulator of the U1, and the resistors R4-R12, R14-R17, R19-R22 and R31 are used for setting the power supply path switch in the U1. The U1 is connected with a resistor R2 on a MINOP pin to set the minimum working voltage of the power management module, specifically, the U1 outputs 2uA bias current on R2, and the minimum working voltage of the system is determined by the resistance value of R2; c9, C10, C11 and C12 are backup super capacitors, wherein part of capacitors play a role in stabilizing voltage and eliminating burrs, C12 and BT1 form a backup battery (the battery is not chargeable), a BACK _ UP pin is connected with the backup battery, and C12 plays a role in stabilizing voltage. The output voltage of the U1 is regulated and deburred by C7 and C8 and then supplied to the whole system.
As shown in fig. 4, the signal processing module includes an amplifying circuit and an integrating circuit, and the current signal detected by the rogowski coil is amplified and integrated by the signal processing module, where the amplifying circuit includes a first amplifier, one input end of the first amplifier is connected to the current signal sensed by the rogowski coil, the other input end is used for connecting to a standard signal, the input end and the output end of the first amplifier are further connected to different resistors, the first amplifier is further connected in parallel to the other resistor, and the current signal is amplified by the amplifying circuit to obtain a current amplified signal; the integrating circuit comprises a second amplifier, one input end of the second amplifier is connected with the output end of the first amplifier, the other input end of the second amplifier is connected with the standard signal, the input end of the second amplifier is also connected with a resistor, the integrating circuit also comprises a capacitor, the second amplifier is connected with the capacitor and the other resistor in parallel, and the integrating circuit is used for carrying out integration reduction processing on the current amplification signal to obtain a current reduction signal; the signal processing module also comprises a filter circuit, which is used for filtering the amplified and integrated signals to make the processed waveforms smoother, sending the filtered signals to an analog-to-digital conversion module, and converting the output analog signal device into digital signals through the analog-to-digital conversion module; the filter circuit can adopt conventional filter circuits such as RC, LC and the like. In this embodiment, a result obtained after the current signal detected by the rogowski coil is processed by the signal processing module is shown in fig. 5. In fig. 5, a "Roche coil" mark curve represents a waveform of the amplified and integrated rogowski coil signal, and an "a current" mark curve is a primary current signal waveform, so that it can be seen that a current signal acquired by the rogowski coil can correctly reflect current changes, including amplitude, phase and other information, and the current signal waveform processed by the signal processing module is substantially consistent with the primary current waveform and frequency.
As shown in fig. 1, the main control module is further connected to a signal conversion module, and outputs a signal to the interface module through the signal conversion module. The signal conversion module can set corresponding output modes according to the environment where the interface module is used and different requirements of the interface module, and comprises the following three structures corresponding to the three output modes. The signal conversion module is a photoelectric coupler, the input side of the photoelectric coupler is connected with the output end of the main control module, the output side of the photoelectric coupler is used for being connected with the interface module, so that electromagnetic isolation between the main control module and the interface module is realized, the anti-electromagnetic interference capability is improved, and a digital signal is output to the interface module through the photoelectric coupler; the requirement that the electromagnetic environment where the interface module is located is complex can be met. The signal conversion module comprises a digital-to-analog conversion circuit (DAC), a signal amplification circuit and an emitter follower circuit which are connected in sequence, wherein the input end of the DAC is connected with the output end of the main control module, the output end of the DAC outputs corresponding voltage signals after being amplified and followed by the signal amplification circuit and the emitter follower circuit, and the voltage signals can be better detected subsequently through amplification and following; the requirement of low signal detection precision of the interface module can be met. And thirdly, the signal conversion module is a digital-to-analog conversion circuit, the input end of the digital-to-analog conversion circuit is connected with the output end of the main control module, and the output end of the digital-to-analog conversion circuit is used for being connected with the interface module so as to convert digital signals output by the main control module into analog current signals and send the analog current signals to the interface module, and the requirement of high detection precision of the interface module can be met. In order to better realize the selection of different modes, the signal conversion module also comprises a change-over switch to realize the change-over of different signal output modes of the signal conversion module, for example, under the condition that certain electromagnetic interference exists in the environment where the interface module is located, the signal conversion module can be switched to a photoelectric coupler through the change-over switch, and the digital signal input through the main control module is transmitted to the interface module by adopting the photoelectric coupler. Wherein the change-over switch can adopt a dial switch.
The Rogowski coil is used for acquiring current signals, the acquired current signals are amplified and integrated through an amplifying circuit and an integrating circuit in a signal processing module, and the processed analog signals are converted into digital signals through an analog-to-digital conversion module; then the output digital signal is processed by the main control module and then output to the signal conversion module, and a proper signal output mode is selected according to different use environments, and the output signal is sent to the interface module; the electromagnetic coil is adopted for power taking, and corresponding voltage can be output through the battery management module to supply power to each module according to the requirements of different module voltages. The invention avoids the problems that the magnetic field of the electromagnetic coil is easy to saturate and the frequency band is narrow, can improve the current measurement precision, and realizes the signal processing and digitization functions through the signal processing module and the main control module; and selecting a proper signal output mode according to different use environments, so as to avoid environmental interference as much as possible.
Claims (10)
1. A current sensor system is characterized by comprising an electromagnetic coil and a Rogowski coil, wherein the electromagnetic coil and the Rogowski coil are used for being arranged on a line to be measured in a penetrating mode; the Rogowski coil is connected with the signal processing module and used for sending the sensed signal to the signal processing module, and the signal processing module is used for amplifying and integrating the sensed current; the electromagnetic coil is connected with the battery management module and used for converting the electric energy acquired by the battery management module and supplying power to the signal processing module and the main control module through the converted electric energy; the main control module is used for processing and outputting the signals output by the signal processing module.
2. The current sensor system of claim 1, further comprising a rectifier, wherein the rectifier is connected to the electromagnetic coil on an ac side and to the battery management module on a dc side for converting ac current sensed by the electromagnetic coil to dc current.
3. The current sensor system of claim 1, further comprising an analog-to-digital conversion module having an input connected to the output of the signal processing module and an output connected to the main control module for converting the analog signal output from the signal processing module into a digital signal, wherein the analog-to-digital conversion module is powered by the power management module.
4. The current sensor system of claim 1, wherein the signal processing module comprises an amplifying circuit and an integrating circuit, the amplifying circuit comprises a first amplifier for amplifying the current signal, and the integrating circuit comprises a second amplifier for integrating and restoring the current amplified signal to obtain a current restored signal.
5. The current sensor system of claim 1, wherein the output end of the main control module is further connected with a signal conversion module, and the signal conversion module outputs a signal.
6. The current sensor system according to claim 5, wherein the signal conversion module is a photoelectric coupler, an input side of the photoelectric coupler is connected with an output end of the main control module, and an output side of the photoelectric coupler is used for being connected with the interface module, so as to realize electromagnetic isolation between the main control module and the interface module.
7. The current sensor system of claim 5, wherein the signal conversion module comprises a digital-to-analog conversion circuit, a signal amplification circuit and an emitter follower circuit, which are connected in sequence, wherein an input end of the digital-to-analog conversion circuit is connected with an output end of the main control module, and an output end of the digital-to-analog conversion circuit outputs a corresponding voltage signal after being amplified and followed by the signal amplification circuit and the emitter follower circuit.
8. The current sensor system according to claim 5, wherein the signal conversion module is a digital-to-analog conversion circuit, an input end of the digital-to-analog conversion circuit is connected to an output end of the main control module, and an output end of the digital-to-analog conversion circuit is used for connecting to the interface module, so as to convert a digital signal output by the main control module into an analog current signal and send the analog current signal to the interface module.
9. The current sensor system according to any one of claims 6-8, wherein the signal conversion module further comprises a switch for switching different signal output modes of the signal conversion module.
10. The current sensor system of claim 1, wherein the electromagnetic coil and the rogowski coil are stacked in concentric circles.
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Application publication date: 20220412 |