CN116359599A - Current energy taking device and method - Google Patents
Current energy taking device and method Download PDFInfo
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- H—ELECTRICITY
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- H02J7/04—Regulation of charging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention belongs to the technical field of equipment, and particularly relates to a current energy taking device and a method, wherein the current energy taking device comprises a current energy taking module; a micro-power consumption patch current sensing unit; a micro-control processing unit; and a wireless transmission module. The high-frequency harmonic wave part in the cable to be tested is charged and supplied with power by the energy storage capacitor through a high-frequency harmonic wave power taking technology and a rectifying and voltage stabilizing circuit by utilizing a current loop; detecting the intensity of an electromagnetic field by using a micro-power consumption patch current sensing unit, converting the electromagnetic field into an electric analog signal, and converting the obtained voltage into a cable current value through a micro-power consumption MCU; and sending the data to a cloud service database in a wireless transmission mode. The device solves the problems of troublesome installation, poor reliability, battery maintenance, safety and the like of the existing similar system, can realize the real-time acquisition and measurement of remote data without additionally paving a power line and a communication line, and has higher use value and application prospect in various electric power monitoring fields.
Description
Technical Field
The invention belongs to the technical field of equipment, and particularly relates to a current energy taking device and a current energy taking method.
Background
Techniques for testing currents based on magnetic fields are already widely available, but these prior art techniques are prone to error in practical use, especially when measuring high currents of potentially hundreds of amperes per current conductor. For example, in the measurement of currents exceeding 600A peak in a three conductor system, a high degree of inaccuracy is found, which means that the existing methods cannot be practically used for current measurement of currents greater than 100-500A peak current per current phase. The reason for this is that manufacturers try to make the measuring device as compact as possible for practical application environments.
On the other hand, if the spacing between the individual current conductors is increased, the gradient field decreases, which in turn leads to inaccurate measurements. This also greatly increases the installation space, wherein for many applications it is not possible to enlarge the measuring area. The largest DC field always occurs when adjacent current conductors, with gradient sensors arranged between them, carry currents of the same intensity in the same direction. If the DC field significantly exceeds the field gradient, the characteristic curve of the gradient sensor may be shifted into a non-linear range where the current gradient cannot be accurately determined. Especially in rotating magnetic field applications of three or more phases, this may occur two or more times in one cycle. A compensation device that generates a demagnetizing field by closed-loop control in order to compensate for the influence of the DC field cannot achieve sufficient correction at the above-mentioned high current values, so that nonlinear distortion occurs in the measurement result.
Disclosure of Invention
In order to solve or improve the problems, the invention provides a current energy taking device and a current energy taking method, and the specific technical scheme is as follows:
the invention provides a current energy taking device, comprising: the current energy-taking module is used for obtaining electric energy from the cable to be tested; the micro-power consumption patch current sensing unit is connected with the current energy-taking module and used for converting a magnetic field signal of the cable to be tested into an analog electric signal; the micro-control processing unit is respectively connected with the current energy-taking module and the micro-power consumption patch current sensing unit, and is used for carrying out digital filtering operation, statistics and analysis on the analog electric signals and transmitting analysis results to the wireless transmission module; and the wireless transmission module is connected with the micro-control processing unit and used for communicating the current data with the cloud server through the terminal.
Preferably, the current energy-taking module comprises an electric energy-taking loop, an electric energy conversion circuit and a voltage-stabilizing energy storage circuit; when a signal to be detected passes through the energy taking magnetic ring, the electric energy taking loop induces and generates current to be transmitted to the electric energy conversion circuit, and the current is rectified into direct current by the electric energy conversion circuit to be transmitted to the voltage stabilizing energy storage circuit for storing electric energy.
Preferably, the power taking loop comprises a current transformer and a power taking power supply rectifying circuit; the current transformer is sleeved on the cable to be tested, and a corresponding magnetic field signal is obtained to be used as an input signal; the power taking power supply rectifying circuit and the current transformer are used for rectifying alternating current signals.
Preferably, the device further comprises a DC-DC converter for rectifying and chopping voltage drop of the electric energy to obtain an output voltage conforming to the cable monitoring device; the input of the DC-DC converter is connected with the output of the power taking power supply rectifying circuit, and the output of the DC-DC converter is connected with a load.
Preferably, the micro-power consumption patch current sensing unit comprises a micro-power consumption sensing IC, a power supply capacitor, a voltage stabilizing buffer capacitor and a decoupling circuit; the power supply capacitor is connected with a power supply and a ground pin of the micro-power consumption sensing IC through a patch capacitor, the voltage stabilizing buffer capacitor is externally connected with a standard zero potential and a digital zero potential of the micro-power consumption sensing IC, and a test interface and a temperature compensation interface of the micro-power consumption sensing IC are connected with the decoupling circuit.
Preferably, the micro-control processing unit comprises a micro-control processor MCU, a crystal oscillator system, an AD conversion circuit and a serial port transmission circuit; the micro control processor MCU is respectively connected with the crystal oscillator system and the AD conversion circuit; and the micro control processor MCU is connected with the wireless transmission module through the serial port transmission circuit.
Preferably, the micro-control processing unit further comprises a main control chip, a sampling conditioning circuit, a wireless communication module and an indicator lamp; the main control chip comprises a processing chip, a peripheral circuit and a ferroelectric temporary storage circuit; the sampling conditioning circuit comprises a current sampling conditioning circuit, a voltage sampling conditioning circuit and a switch; the current sampling conditioning circuit and the voltage sampling conditioning circuit are used for carrying out sampling filtering modulation processing on signals monitored in real time in the signal sampling conditioning area; the switch is used for realizing sampling conditioning switching of current signals and voltage signals; the indicator lamp is used for indicating the power supply state and the signal transmission state of the circuit.
The invention provides a current energy taking method, which comprises the following steps: setting a current energy taking module to obtain electric energy from the cable to be tested; setting a micro-power consumption patch current sensing unit to convert a magnetic field signal of the cable to be tested into an analog electric signal; setting a micro-control processing unit to perform digital filtering operation, statistics and analysis on the analog electric signals, and transmitting analysis results to a wireless transmission module; and setting a wireless transmission module to communicate the current data with the cloud server.
The beneficial effects of the invention are as follows: the high-frequency harmonic wave part in the cable to be tested is charged to the energy storage capacitor by the current loop through a high-frequency harmonic wave electricity taking technology and the rectification voltage stabilizing circuit, so as to supply power to the system; meanwhile, the micro-power consumption patch current sensing unit is used for detecting the electromagnetic field intensity of the cable to be tested, converting the electromagnetic field intensity into an electric analog signal, performing A/D conversion into digital quantity, and converting the obtained voltage into a cable current value through the micro-power consumption MCU; and finally, transmitting the data to a cloud service database in a wireless transmission mode. The integrated wireless passive electricity taking, micro-power consumption current monitoring and remote real-time transmission solve the problems of troublesome installation, poor reliability, battery maintenance, safety and the like of the existing similar system, can realize the real-time acquisition and measurement of remote data without additionally laying a power line and a communication line, and has higher use value and application prospect in various power monitoring fields.
Drawings
Fig. 1 is a schematic diagram of a current energy-taking device according to an embodiment of the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the invention provides a current energy taking device shown in fig. 1, which comprises: the current energy-taking module is used for obtaining electric energy from the cable to be tested; the micro-power consumption patch current sensing unit is connected with the current energy-taking module and used for converting a magnetic field signal of the cable to be tested into an analog electric signal; the micro-control processing unit is respectively connected with the current energy-taking module and the micro-power consumption patch current sensing unit, and is used for carrying out digital filtering operation, statistics and analysis on the analog electric signals and transmitting analysis results to the wireless transmission module; and the wireless transmission module is connected with the micro-control processing unit and used for communicating the current data with the cloud server through the terminal.
A current energy harvesting apparatus comprising: the device comprises a current energy taking module, a micro-power consumption patch current sensing unit, a micro-control processing unit and a wireless transmission module.
The current energy-taking module is used for obtaining electric energy from the signal cable to be tested. The micro-power consumption patch current sensing unit is used for electromagnetically converting a current magnetic field of a cable to be measured into an analog electric signal and realizing magneto-electric conversion of a measurement signal. And the micro-control processing unit is used for AD acquisition of the analog signals generated by the patch sensing unit, digital filtering operation statistics and analysis, and serial transmission of the result to the wireless transmission module. And the wireless transmission module is used for writing an http transmission protocol through the wireless transmission module, so that data communication between the terminal and the cloud is realized, wherein the data comprise various current signals related to power monitoring.
The current energy-taking magnetic ring is sleeved with the cable to be tested, and the output of the current energy-taking magnetic ring is connected with the energy storage capacitor module; the micro-power consumption patch current sensing unit is respectively connected with the micro-control processing unit and the energy storage capacitor module; the micro control processing unit is connected with the micro power consumption patch current sensing unit, the energy storage capacitor module and the wireless transmission module.
The current energy-taking module comprises an electric energy-taking loop, an electric energy conversion circuit and a voltage-stabilizing energy-storage circuit, wherein the electric energy-taking loop surrounds the energy-taking magnetic ring, when a signal to be tested passes through the magnetic ring, the electric energy-taking loop induces to generate a current to transmit the electric energy conversion circuit, and the direct-current electric energy is converted into direct-current electric energy through the voltage-stabilizing energy-storage circuit by rectification of the conversion circuit to store the electric energy.
The working principle is as follows: when the current is (t) flows through the transmission line of the current magnetic ring, the secondary side of the current magnetic ring generates current through electromagnetic induction, and the principle is the simplest principle of electricity taking and relates to the basic property of the current transformer. At this time, the voltage load u0 (t) is in an alternating current form, and the power consumption of the sensing unit and the micro-power consumption processing unit is direct current, so that u0 (t) is subjected to rectification processing; the rectification needs to be carried out on the voltage at the same time, but the voltage is generally difficult to reach the standard, and the DC-DC converter is needed to carry out chopping voltage reduction again, so that the output voltage meets the voltage requirement of cable monitoring equipment, and the rectification of the conversion circuit into direct-current electric energy is realized, and the direct-current electric energy is stored in the voltage-stabilizing energy storage circuit.
In actual use, the electric equipment is generally connected in parallel with the secondary side of the CT, and through installing the annular magnetic core of the CT outside the alternating-current high-voltage power transmission cable, when the current is (t) flows through the power transmission line of the CT, electromagnetic induction is carried out on the secondary side of the CT, and meanwhile, current can be generated to pass through a load. At this time, the voltage load u0 (t) is in an alternating current form, and the power consumption of the on-line detection device is direct current, so that u0 (t) is subjected to rectification treatment; the rectification needs to be carried out on the voltage at the same time, but the voltage is difficult to reach the standard generally, and the chopping voltage reduction is carried out again by utilizing the DC-DC converter, and the DC-DC converter circuit is connected behind the rectification circuit, so that the output voltage of the rectification circuit meets the voltage condition of the cable monitoring equipment.
The whole power supply comprises three parts, wherein the main module comprises a current transformer, a power supply rectifying circuit and a rear-stage DC-DC converter, the current transformer is sleeved on a cable to be tested, an input signal is a magnetic field signal of the cable to be tested, the output of the current transformer is connected to the input end of the rectifying circuit of the power supply, the output of the rectifying circuit is externally connected with the rear-stage DC-DC converter, and finally, the power supply is used for supplying electric energy required by monitoring equipment.
1. A current transformer: the maximum power obtained from a given primary side current through the CT loop is realized to improve the capacity of the whole current energy taking module.
The current transformer Is mainly determined by the power taking capability of the power taking transformer, the power taking capability Is mainly determined by the iron core material of the power taking transformer, in addition, the power supply section of the cable (the power transmission current Is of the cable) Is determined by the power consumption condition of the power transmission cable, the size change Is variable, the stability degree Is poor, if the power consumption Is low, the cable current Is small, and the current in a power grid can rise to about kA when a short circuit fault occurs. Therefore, the power taking transformer designed in the embodiment can work stably under various primary currents, a certain CT excitation parameter with reasonable design of a maximum power calculation model of the power taking transformer is established through ventilation to solve the problem that when the cable current is overlarge, the magnetic flux of the transformer core is prevented from being oversaturated, and enough power is obtained at the primary side when the cable current is small, and the design problem of the power taking transformer is converted into a CT power taking circuit considering the nonlinear characteristics of a CT magnetic core.
In combination, the loop design is as follows: the modulus of the admittance is known, and in order to obtain a value that is the smallest, the real part of the admittance should be the largest, so its imaginary part must be zero. Thus, the capacitance value of the capacitor to be connected in parallel under the condition of a certain secondary side voltage is as follows:
it is still matched with Lm (Uo); in addition, the resistance value of the resistor which should be connected in parallel at the moment of the CT secondary side accords with the appointed value, and correspondingly, the actual power obtained by the power taking circuit also meets the corresponding requirement.
The values of the current transformers Lm and Rm corresponding to the secondary voltages can be obtained through experiments, so that the maximum power and the corresponding impedance which can be obtained by the secondary voltages U0 under the condition that the primary current Is not changed can be obtained. In addition, since the value of Rm becomes smaller when U0 exceeds a certain value, the calculated power must be significantly reduced after U0 reaches a certain value, and thus there must be an optimal U0 value, which is-1/ωcp (Uo).
And under the condition of U0 change, the rule that Lm and Rm change along with the change is measured, so that the impedance value of the secondary side of the voltage regulator under the condition of U0 value change, namely [ Z2sigma+Zm (Uo) ] can be obtained through calculation. The CT magnetic core used for power taking is large, so that the power can be maximized under the condition of small number of parallel capacitors at the secondary side, the Lm. value is about hundreds of millihenries when the magnetic circuit is opened, the inductive reactance of Lm is generally far less than the resistance value of Rm when the air gap is closed. It follows that the secondary leakage resistance can be left uncomputed in such a case, since this leakage resistance is very small compared to the excitation resistance of CT, zm (Uo) can be directly represented by the impedance resulting from this calculation, and the values Lm (Uo) and Rm (Uo) can be further derived.
2. Power supply rectifying circuit:
in order to obtain the required direct current at the output of the power supply, it is necessary to rectify the alternating current on the secondary side. The circuit is a rectifying circuit capable of being regulated and controlled, and the full-active rectifying circuit is adopted, so that the voltage corresponding to the full-active rectifying circuit is regulated and controlled to be a specific square wave, and the exciting inductance can be effectively supplemented; if the phase difference between the square wave input voltage and the CT primary side current can be effectively regulated, the rectified output voltage can be kept at a fixed value under each primary side current. Therefore, under the condition, a plurality of other nonpolar capacitors are not required to be connected in parallel with the secondary side of the CT, so that the total time length of hardware debugging is effectively shortened, meanwhile, the problem of mismatch caused by too long operation of a power supply is effectively avoided, and the primary side current is required to be effectively isolated and sampled.
The operation of the fully active circuit in one period can be divided into two phases as a whole:
period 1 (0. Ltoreq.ωt. Ltoreq.pi): in this period Q1 and Q3 are in communication, uo (t) =uodc, and the CT exciting current iLm (t) is in a linearly rising state;
rectifier bridge input current:
rectifier bridge output current:
period 2 (pi. Ltoreq. ωt. Ltoreq.2pi): after this period Q1 and Q3 is turned on for one half period, Q2 and Q4 are adjusted to be in communication, uo (t) = -Uodc, iLm (t) at this point appears as a linear downslope.
Rectifier bridge input current:
rectifier bridge output current:
the output voltage varies with the control angle, and the expression corresponding to the variation of the output voltage is:
the specific expression for calculating the output power is as follows:
3. post-stage DC-DC converter design:
the design of the post-stage DC-DC converter is mainly the design of a conversion circuit and a circuit control principle, the voltage of the rectification circuit is stably converted to the voltage level required by a load, the input of the converter is connected with the output of the rectification circuit, the output of the converter is connected with the load, the power supply, the load and a battery are controlled to realize good energy transmission, and stable electric energy supply is provided for electric equipment.
(1) Conversion circuit
The back stage DC-DC conversion circuit selects Flyback corresponding to Buck-Boost topology.
The Qf duty ratio is D1 at this time, and the corresponding period is Ts, so that the sub-interval of Qf conduction in this period corresponds to the input current ifin (t) expressed as
The actual length of Qf off is (1-D1) Ts, and the current ifin (t) corresponding to the circuit is always kept at 0.
When the Flyback converter is designed, in order to make the transformer Tf easier to wind, and reduce the voltage born by Qf when Tf freewheels, the turns of the Flyback transformer are smaller than nf; correspondingly, the Qf on duty ratio D1 required by the power supply to obtain the maximum power when the current of the primary side of the CT is small also takes a smaller value of 0.15. Considering that the output power of the Flyback converter is small under the condition of low primary side current, in order to reduce the switching loss of the converter at this time, the switching frequency is intentionally selected to be lower than 20kHz, and the corresponding switching period ts=50 μs. Substituting these parameters of the Flyback circuit and the Flyback equivalent input resistance rldc=6kΩ required for obtaining the maximum power, the primary inductance of the transformer Tf can be obtained.
The micro-power consumption patch current sensing unit comprises a micro-power consumption sensing IC (MLX series), a power supply capacitor, a voltage stabilizing buffer capacitor and a decoupling circuit; the power supply capacitor is connected with an IC power supply and a grounding pin through the patch capacitor, the voltage stabilizing buffer capacitor is externally connected with a standard zero potential and a digital zero potential of the IC, and the test interface of the micro-power consumption sensing IC is connected with the decoupling circuit through the temperature compensation interface. The working principle is that the power supply used by the micro-power consumption sensing IC is a single 5V power supply, and compared with the power consumption of a Hall sensor powered by +/-15V, the power consumption is reduced by six times to realize micro-power consumption; when the current cable to be tested passes through the pair of parallel IC surfaces, the output signal generated by the IC is in direct proportion to the horizontally applied magnetic flux density, and the current cable to be tested has small-size application design and simple structure, and is suitable for micro-power consumption patch sensing of test current in various current ranges from a few amperes to thousands of amperes.
The micro-control processing unit comprises a micro-control processor MCU, a crystal oscillator system, an AD conversion circuit and a serial port transmission circuit; the MCU is directly connected with the crystal oscillator system, the AD conversion circuit converts signals and is connected with the MCU, and the MCU processing operation is connected with the wireless transmission module through a serial port. The micro-control processing unit is mainly used for acquiring electrical data in real time through the micro-power consumption patch current sensing unit, filtering and denoising the acquired data by using a multi-resolution multi-sensor data fusion technology, and then carrying out local storage on the data and carrying out real-time transmission to a remote upper computer through GPRS wireless transmission.
And the signal sampling conditioning area carries out sampling filtering modulation processing on the signal monitored in real time and supports the sampling of the current signal.
The power supply area can adopt STM32 to provide working voltages of 3.3V and +/-15V for a main control chip, a sampling conditioning circuit, a wireless communication module and the like, and supports adapter, USB and backup power supply modes.
The STM32 main control chip area comprises an STM32 processing chip, a peripheral circuit and a ferroelectric temporary storage circuit.
JTAG programming and SD card reading and writing areas support secondary development of a system and initiation of a program SD.
The serial port wireless communication interface is an interface for communication of the GPRS wireless transmission module.
The indicator light area indicates a circuit power state, a signal transmission state, and the like.
The serial port unit and the wireless transmission module form a transmission network link between the sensing system terminal and the background server based on an http transmission protocol. Only the forwarding of data by threads is used in the thread pool. And the terminal server is used as a terminal for storage, and the threads are used in the thread pool for realizing database storage of data. In addition, the terminal server also needs an http protocol thread for realizing the issuing function of the command, and is used for controlling each node device to realize link communication.
The current data sensed by the system comprises various current signals related to power monitoring, a sensing system terminal acquires an http communication transmission protocol built in a data wireless transmission module and is in wireless matching with a wireless cloud data background, and a server terminal realizes concurrency performance based on a thread pool technology; the server side creates the sub-thread in advance, and when the server side receives the request, the sub-thread created in advance is used for responding to the request, and the server side maintains the sub-thread.
The invention uses the current loop to charge the energy storage capacitor through the high-frequency harmonic power-taking technology and the rectification voltage-stabilizing circuit in the high-frequency harmonic part of the cable to be tested, so as to supply power to the system; meanwhile, the micro-power consumption patch current sensing unit is used for detecting the electromagnetic field intensity of the cable to be tested, converting the electromagnetic field intensity into an electric analog signal, performing A/D conversion into digital quantity, and converting the obtained voltage into a cable current value through the micro-power consumption MCU; and finally, transmitting the data to a cloud service database in a wireless transmission mode. The integrated wireless passive electricity taking, micro-power consumption current monitoring and remote real-time transmission solve the problems of troublesome installation, poor reliability, battery maintenance, safety and the like of the existing similar system, can realize the real-time acquisition and measurement of remote data without additionally laying a power line and a communication line, and has higher use value and application prospect in various power monitoring fields.
The current energy-taking module comprises an electric energy-taking loop, an electric energy conversion circuit and a voltage-stabilizing energy-storage circuit; when a signal to be detected passes through the energy taking magnetic ring, the electric energy taking loop induces and generates current to be transmitted to the electric energy conversion circuit, and the current is rectified into direct current by the electric energy conversion circuit to be transmitted to the voltage stabilizing energy storage circuit for storing electric energy.
The power taking loop comprises a current transformer and a power taking power supply rectifying circuit; the current transformer is sleeved on the cable to be tested, and a corresponding magnetic field signal is obtained to be used as an input signal; the power taking power supply rectifying circuit and the current transformer are used for rectifying alternating current signals.
The device also comprises a DC-DC converter, a chopper voltage drop and a DC-DC converter, wherein the DC-DC converter is used for rectifying and is also used for chopper voltage drop of electric energy so as to obtain output voltage conforming to the cable monitoring equipment; the input of the DC-DC converter is connected with the output of the power taking power supply rectifying circuit, and the output of the DC-DC converter is connected with a load.
The micro-power consumption patch current sensing unit comprises a micro-power consumption sensing IC, a power supply capacitor, a voltage stabilizing buffer capacitor and a decoupling circuit; the power supply capacitor is connected with a power supply and a ground pin of the micro-power consumption sensing IC through a patch capacitor, the voltage stabilizing buffer capacitor is externally connected with a standard zero potential and a digital zero potential of the micro-power consumption sensing IC, and a test interface and a temperature compensation interface of the micro-power consumption sensing IC are connected with the decoupling circuit.
The micro-control processing unit comprises a micro-control processor MCU, a crystal oscillator system, an AD conversion circuit and a serial port transmission circuit; the micro control processor MCU is respectively connected with the crystal oscillator system and the AD conversion circuit; and the micro control processor MCU is connected with the wireless transmission module through the serial port transmission circuit.
The micro-control processing unit also comprises a main control chip, a sampling conditioning circuit, a wireless communication module and an indicator lamp; the main control chip comprises a processing chip, a peripheral circuit and a ferroelectric temporary storage circuit; the sampling conditioning circuit comprises a current sampling conditioning circuit, a voltage sampling conditioning circuit and a switch; the current sampling conditioning circuit and the voltage sampling conditioning circuit are used for carrying out sampling filtering modulation processing on signals monitored in real time in the signal sampling conditioning area; the switch is used for realizing sampling conditioning switching of current signals and voltage signals; the indicator lamp is used for indicating the power supply state and the signal transmission state of the circuit.
The invention provides a current energy taking method, which comprises the following steps: setting a current energy taking module to obtain electric energy from the cable to be tested; setting a micro-power consumption patch current sensing unit to convert a magnetic field signal of the cable to be tested into an analog electric signal; setting a micro-control processing unit to perform digital filtering operation, statistics and analysis on the analog electric signals, and transmitting analysis results to a wireless transmission module; and setting a wireless transmission module to communicate the current data with the cloud server.
Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein can be implemented as electronic hardware, computer software, or combinations of both, and that the elements of the examples have been described generally in terms of functionality in the foregoing description to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in this application, it should be understood that the division of units is merely a logic function division, and there may be other manners of division in practical implementation, for example, multiple units may be combined into one unit, one unit may be split into multiple units, or some features may be omitted.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention, and are intended to be included within the scope of the appended claims and description.
Claims (8)
1. A current energy harvesting apparatus, comprising:
the current energy-taking module is used for obtaining electric energy from the cable to be tested;
the micro-power consumption patch current sensing unit is connected with the current energy-taking module and used for converting a magnetic field signal of the cable to be tested into an analog electric signal;
the micro-control processing unit is respectively connected with the current energy-taking module and the micro-power consumption patch current sensing unit, and is used for carrying out digital filtering operation, statistics and analysis on the analog electric signals and transmitting analysis results to the wireless transmission module;
and the wireless transmission module is connected with the micro-control processing unit and used for communicating the current data with the cloud server through the terminal.
2. The current energy extraction device of claim 1, wherein the current energy extraction module comprises an electrical extraction coil loop, an electrical energy conversion circuit, and a voltage stabilizing tank circuit;
when a signal to be detected passes through the energy taking magnetic ring, the electric energy taking loop induces and generates current to be transmitted to the electric energy conversion circuit, and the current is rectified into direct current by the electric energy conversion circuit to be transmitted to the voltage stabilizing energy storage circuit for storing electric energy.
3. The current energy extraction device of claim 2, wherein the power extraction loop comprises a current transformer and a power extraction power supply rectifying circuit;
the current transformer is sleeved on the cable to be tested, and a corresponding magnetic field signal is obtained to be used as an input signal;
the power taking power supply rectifying circuit and the current transformer are used for rectifying alternating current signals.
4. A current energy harvesting apparatus according to claim 3, further comprising a DC-DC converter for rectifying the electrical energy and for chopper voltage drop of the electrical energy to obtain an output voltage conforming to the cable monitoring device;
the input of the DC-DC converter is connected with the output of the power taking power supply rectifying circuit, and the output of the DC-DC converter is connected with a load.
5. The current energy extraction device of claim 4, wherein the micro-power patch current sensing unit comprises a micro-power sensing IC, a power supply capacitor, a voltage stabilizing buffer capacitor, and a decoupling circuit;
the power supply capacitor is connected with a power supply and a ground pin of the micro-power consumption sensing IC through a patch capacitor, the voltage stabilizing buffer capacitor is externally connected with a standard zero potential and a digital zero potential of the micro-power consumption sensing IC, and a test interface and a temperature compensation interface of the micro-power consumption sensing IC are connected with the decoupling circuit.
6. The current energy taking device according to claim 5, wherein the micro control processing unit comprises a micro control processor MCU, a crystal oscillator system, an AD conversion circuit and a serial port transmission circuit;
the micro control processor MCU is respectively connected with the crystal oscillator system and the AD conversion circuit;
and the micro control processor MCU is connected with the wireless transmission module through the serial port transmission circuit.
7. The current energy taking device according to claim 6, wherein the micro-control processing unit further comprises a main control chip, a sampling conditioning circuit, a wireless communication module and an indicator lamp;
the main control chip comprises a processing chip, a peripheral circuit and a ferroelectric temporary storage circuit;
the sampling conditioning circuit comprises a current sampling conditioning circuit, a voltage sampling conditioning circuit and a switch;
the current sampling conditioning circuit and the voltage sampling conditioning circuit are used for carrying out sampling filtering modulation processing on signals monitored in real time in the signal sampling conditioning area;
the switch is used for realizing sampling conditioning switching of current signals and voltage signals;
the indicator lamp is used for indicating the power supply state and the signal transmission state of the circuit.
8. A method of current energy extraction, comprising:
setting a current energy taking module to obtain electric energy from the cable to be tested;
setting a micro-power consumption patch current sensing unit to convert a magnetic field signal of the cable to be tested into an analog electric signal;
setting a micro-control processing unit to perform digital filtering operation, statistics and analysis on the analog electric signals, and transmitting analysis results to a wireless transmission module;
and setting a wireless transmission module to communicate the current data with the cloud server.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310354497.6A CN116359599A (en) | 2023-04-04 | 2023-04-04 | Current energy taking device and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310354497.6A CN116359599A (en) | 2023-04-04 | 2023-04-04 | Current energy taking device and method |
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| CN116359599A true CN116359599A (en) | 2023-06-30 |
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| CN202310354497.6A Pending CN116359599A (en) | 2023-04-04 | 2023-04-04 | Current energy taking device and method |
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