CN209264817U - Passive and wireless current sensor based on double-winding current mutual inductor - Google Patents
Passive and wireless current sensor based on double-winding current mutual inductor Download PDFInfo
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- CN209264817U CN209264817U CN201822044158.5U CN201822044158U CN209264817U CN 209264817 U CN209264817 U CN 209264817U CN 201822044158 U CN201822044158 U CN 201822044158U CN 209264817 U CN209264817 U CN 209264817U
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Abstract
A kind of passive and wireless current sensor based on double-winding current mutual inductor, energy module, energy storage module, current sense module, signal processing module, wireless transmitter module are taken including double-winding current mutual inductor, mutual inductance, double-winding current mutual inductor includes the first side winding connecting with test line and two secondary side windings, and two secondary side windings take energy module and current sense module to connect with mutual inductance respectively.The utility model can be applied to smart grid electric energy monitoring system, provide the energy without exterior power supply plant, and a mutual inductor is used only and carries out collection of energy and current sense, reduces the volume of system, facilitates installation.The utility model can carry out maximal power tracing according to the size of current that sensing module measures, and substantially increase the power output for taking energy module, system starting current is reduced, to improve the reliability of sensor, extend use scope.
Description
Technical field
The utility model relates to electrical facility technical fields more particularly to a kind of based on the passive of double-winding current mutual inductor
Wireless current sensor.
Background technique
In electric power monitoring and management system, due to ammeter metering fault itself, user terminal to ammeter it is illegal change and
It detours, the reasons such as power supply unit aging line loss can generate line loss, and the means for differentiating line loss reason at present depend on people
Work site inspection analysis, working efficiency is low, and human cost is high.Smart grid carries out on-line real time monitoring, monitoring effect to transmission of electricity road
Rate is high, time saving and energy saving, is of great significance to power system security stabilization.In the prior art, the current sense in smart grid
Device mostly uses the passive and wireless current sensor product based on current transformer, input be terminated with energy acquisition mutual inductor L1,
Current acquisition mutual inductor L2 is respectively intended to carry out alternating current collection of energy and current strength acquisition.In energy acquisition part, mutual inductance
The energy that device is collected will be charged by level conversion Power Management Unit to battery or super capacitor, and straight by DC-DC
Conversion module is flowed to export stable direct-current working volts.In signal acquisition part, usually using accurate voltage signal amplification electricity
Road is to realize the amplification of low current signal, and the ADC module for being linked into single-chip microcontroller obtains digital quantity, eventually by system
The digital signal of acquisition is sent remote monitoring system (please referring to shown in Fig. 1) by wireless module.It is this to be based on current transformer
Passive and wireless current sensor product there is following problems: 1, carry out the acquisition of current signal respectively using two mutual inductors
With the collection of energy, the volume of mutual inductor is increased, is unfavorable for the miniaturization of monitoring device；2, with charging capacitor/battery
Voltage change, current transformer output power can have a maximum power point, and this power points can be big with side electric current
Small different and change, this product cannot achieve maximum power tracing, thus can not achieve take can efficiency maximization.
Summary of the invention
The technical issues of the utility model is solved is to provide a kind of passive and wireless based on double-winding current mutual inductor
Current sensor.The sensor can be applied to smart grid electric energy monitoring system, the calibration cartridge as power network line metering device
It sets and inspection table uses, carry out the analysis of distribution line line loss, line loss Producing reason is found, to realize more intelligent electricity
It can management；The sensor provides the energy without exterior power supply plant, and a mutual inductor is used only and carries out collection of energy and electric current biography
Sense, reduces the volume of system, facilitates installation；The sensor take can module can according to the size of current that sensing module measures into
Row maximal power tracing substantially increases the power output for taking energy module, system starting current is reduced, to improve sensing
The reliability of device extends use scope.
In order to solve the above technical problems, the utility model adopts the following technical solution:
A kind of passive and wireless current sensor based on double-winding current mutual inductor, it is characterised in that: including double winding electricity
Current transformer, mutual inductance take energy module, energy storage module, current sense module, signal processing module, wireless transmitter module, double
Winding current transformer includes the first side winding connecting with test line and two secondary side windings, two secondary sides around
Group takes energy module and current sense module to connect with mutual inductance respectively；Current sense module and signal processing module, wireless transmission mould
Block is sequentially connected, and current sense module converts voltage signal for current signal and then passes to signal processing module；At signal
Reason module carries out analog-to-digital conversion to signal and calculating current virtual value then passes to wireless transmitter module, and wireless transmitter module will
Current effective value is output to cloud, mutual inductance take can module connect with energy storage module and to provide electric energy for energy storage module defeated
Enter, energy storage module takes energy module, current sense module, signal processing module, wireless transmitter module to connect with mutual inductance respectively
And electric energy is provided for it, current sense module takes energy module to connect and provides reference voltage for it with mutual inductance.
Further, it includes full bridge rectifier, buffering capacitor, comparator, DC/DC conversion that the mutual inductance, which takes energy module,
Device, switch, full bridge rectifier is connect with secondary side winding rectifies the electric current of secondary side winding outflow, and comparator one
Input port, which connect with current sense module and provides reference voltage, another input terminal and buffering capacitor by current sense module, to be connected
It connects, comparator output terminal is connected with switch to be closed for control switch, and switch is mounted on DC/DC converter and full bridge rectifier
Between circuit in, the connection for being connected to or disconnecting between DC/DC converter and full bridge rectifier, buffering capacitor one end connect
Connect full bridge rectifier other end connection comparator, DC/DC converter and energy storage module circuit connection, the power supply of comparator
Circuit is connect with energy storage module.
Further, the current sense module includes sampling resistor, low-pass filter circuit and current sense amplifier.
Further, the energy storage module includes super capacitor and lithium battery.
Passive and wireless current sensor described in the utility model based on double-winding current mutual inductor, utilizes double-winding current
First side winding high current is converted into secondary side winding low current according to electromagnetic induction principle by mutual inductor.Double-winding current mutual inductance
Device shares a first side winding and iron core-closed, and two secondary side windings are respectively intended to carry out the collection of electric energy and electric current
Measurement.
Mutual inductance takes energy module to rectify by the electric current that full bridge rectifier flows out secondary side winding, then to buffering
Capacitor charges.In the case where first side winding electric current is constant, charge power is directly related with buffering capacitance voltage, exists
One makes the maximum voltage of charge power, i.e. maximum power point voltage.Maximum power point voltage is close with first side winding electric current
It is seemingly proportional, therefore maximum power point voltage can be obtained by current sense module.Buffering capacitance voltage, which is linked into, to be compared
One input terminal of device, the reference voltage of another input terminal of comparator are provided by current sense module.When buffering capacitance voltage is excessive
When, comparator control switch closure, DC/DC converter is started to work, and energy is input to energy storage module, to make to buffer
Capacitance voltage decline.When buffering capacitance voltage is too small, comparator control switch is disconnected, and all electric currents only fill buffering capacitor
Electricity, so that buffering capacitance voltage rises.By switching the control with comparator so that capacitance voltage maintains maximum power point electricity
Near pressure, to keep maximum charge power in the case where first side winding curent change.
The utility model uses maximum power control circuit, carries out output power point according to the current signal strength of acquisition
Feedback control so that buffering capacitance voltage stablize near maximum output power point, thus by energy collecting efficiency promotion arrive
Maximum reduces the minimum starting current of system, extends the applicable current range of passive and wireless current sensor.
The utility model uses double-winding current mutual inductor, further reduces mutual inductor volume, while single mutual
Realize that mutual inductance takes energy and current acquisition on sensor simultaneously, the control of mutual inductor proportionate relationship is more accurate, reduces maximum power control
The deviation of system.
The collected current signal of current sense module is buffered by signal processing module, then by wireless transmitter module
Periodic signal transmitting is carried out, while reducing system power dissipation, current data will not be lost.
Detailed description of the invention
Fig. 1 is passive and wireless current transformer structural schematic diagram in the prior art；
Fig. 2 is the structural representation of the passive and wireless current sensor described in the utility model based on double-winding current mutual inductor
Figure；
Fig. 3 is the structural schematic diagram that mutual inductance described in the utility model takes energy module；
Fig. 4 is current sense module principle figure；
Specific embodiment
Below in conjunction with attached drawing, the technical solution in the present embodiment is clearly and completely described, embodiment is only this
Utility model a part of the embodiment, instead of all the embodiments.Those of ordinary skill in the art are not making creative labor
Every other embodiment obtained under the premise of dynamic, fall within the protection scope of the utility model.
It please refers to shown in Fig. 2, the utility model provides a kind of passive and wireless electric current based on double-winding current mutual inductor
Sensor, including double-winding current mutual inductor, mutual inductance take energy module, energy storage module, current sense module, signal processing mould
Block, wireless transmitter module, double-winding current mutual inductor include that the first side winding connecting with test line and two are secondary
Side winding, two secondary side windings take energy module and current sense module to connect with mutual inductance respectively；Current sense module and signal
Processing module, wireless transmitter module are sequentially connected, and current sense module converts voltage signal for current signal and then passes to
Signal processing module；Signal processing module carries out analog-to-digital conversion to signal and calculating current virtual value then passes to wireless transmission
Current effective value is output to cloud by module, wireless transmitter module, and mutual inductance takes energy module to connect with energy storage module and be energy
It measures memory module and electric energy input is provided, energy storage module takes with mutual inductance respectively can module, current sense module, signal processing mould
Block, wireless transmitter module connect and provide electric energy for it.Current sense module is mutual inductance according to the size of first side winding electric current
Energy module is taken to provide corresponding reference voltage to realize that mutual inductance takes the maximal power tracing of energy module.Current transformer utilizes electromagnetism sense
Answer principle that primary side high current is converted into secondary side low current.Double-winding current mutual inductor share a first side winding and
Iron core-closed, two secondary side windings are respectively intended to carry out the collection of electric energy and the measurement of electric current.
As shown in figure 3, mutual inductance takes energy module to include full bridge rectifier, buffering capacitor, comparator, DC/DC converter, open
It closes, the electric current for taking energy secondary side winding to enter passes through full bridge rectifier first and rectified, and then fills to buffering capacitor
Electricity.In the case where first side winding electric current is constant, charge power is directly related with buffering capacitance voltage, and there are one to fill
The maximum voltage of electrical power, i.e. maximum power point voltage.Maximum power point voltage directly proportional pass approximate with first side winding electric current
System, therefore maximum power point voltage can be obtained by current sense module.The voltage for buffering capacitor is linked into comparator one
The reference voltage of input terminal, another input terminal of comparator is provided by current sense module.When buffering capacitance voltage is excessive, compare
Device control switch closure, DC/DC converter are started to work, and energy is input to energy storage module, to make to buffer capacitor electricity
Drops.When buffer capacitance voltage it is too small when, comparator control switch disconnect, all electric currents only to buffering capacitor charging so that
Capacitance voltage is buffered to rise.By switching with the control of comparator, so that buffering capacitance voltage, to maintain maximum power point voltage attached
Closely, to keep maximum charge power in the case where first side winding curent change.
As shown in figure 4, current sense module utilizes R0For sampling resistor, R1、R2With C3Low-pass filter circuit is constituted, it can be with
Higher harmonic component is filtered out, C1、C2Common end grounding makes the signal positive value of input current sensor amplifier INA199.Pass through
Change R0Size, the range of current sense module can be adjusted.
Energy storage module includes super capacitor and lithium battery, and super capacitor can undertake instantaneous larger charge and discharge electric work
Rate, to improve the stability and working life of system.The energy density of lithium battery is higher to can store more electric energy.
Analog voltage signal is changed into digital signal and cached by signal processing module.
Wireless transmitter module periodically obtains data cached from signal processing module and is emitted to cloud by GPRS,
The energy consumption of system can be greatly reduced.
The above descriptions are merely exemplary embodiments of the present utility model, the model being not intended to limit the utility model
It encloses.Any those skilled in the art, made equivalent variations under the premise of not departing from the conceptions and principles of the utility model
With modification, the range of the utility model protection should belong to.
Claims (4)
1. a kind of passive and wireless current sensor based on double-winding current mutual inductor, it is characterised in that: including double-winding current
Mutual inductor, mutual inductance take energy module, energy storage module, current sense module, signal processing module, wireless transmitter module, double wrap
Group current transformer includes the first side winding connecting with test line and two secondary side windings, two secondary side windings
Energy module and current sense module is taken to connect with mutual inductance respectively；Current sense module and signal processing module, wireless transmitter module
It is sequentially connected, current sense module converts voltage signal for current signal and then passes to signal processing module；Signal processing
Module carries out analog-to-digital conversion to signal and calculating current virtual value then passes to wireless transmitter module, and wireless transmitter module will be electric
Stream virtual value is output to cloud, mutual inductance take can module connect with energy storage module and to provide electric energy for energy storage module defeated
Enter, energy storage module takes energy module, current sense module, signal processing module, wireless transmitter module to connect with mutual inductance respectively
And electric energy is provided for it, current sense module takes energy module to connect and provides reference voltage for it with mutual inductance.
2. a kind of passive and wireless current sensor based on double-winding current mutual inductor according to claim 1, feature
Be: it includes full bridge rectifier, buffering capacitor, comparator, DC/DC converter, switch that the mutual inductance, which takes energy module, and full-bridge is whole
Current circuit is connect with secondary side winding rectifies the electric current of secondary side winding outflow, one input port of comparator and electric current
Sensing module connection simultaneously provides reference voltage, another input terminal and buffering capacitance connection, comparator output by current sense module
End is connected with switch to be closed for control switch, and switch is mounted in the circuit between DC/DC converter and full bridge rectifier,
Connection for being connected to or disconnecting between DC/DC converter and full bridge rectifier, buffering capacitor one end connection full-bridge rectification electricity
The road other end connects comparator, DC/DC converter and energy storage module circuit connection, and power supply circuit and the energy of comparator are deposited
Store up module connection.
3. a kind of passive and wireless current sensor based on double-winding current mutual inductor according to claim 1, feature
Be: the current sense module includes sampling resistor, low-pass filter circuit and current sense amplifier.
4. a kind of passive and wireless current sensor based on double-winding current mutual inductor according to claim 1, feature
Be: the energy storage module includes super capacitor and lithium battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822044158.5U CN209264817U (en) | 2018-12-06 | 2018-12-06 | Passive and wireless current sensor based on double-winding current mutual inductor |
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| CN201822044158.5U CN209264817U (en) | 2018-12-06 | 2018-12-06 | Passive and wireless current sensor based on double-winding current mutual inductor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270337A (en) * | 2018-12-06 | 2019-01-25 | 石家庄杰泰特动力能源有限公司 | Passive and wireless current sensor based on double-winding current mutual inductor |
| US20210109131A1 (en) * | 2019-10-14 | 2021-04-15 | Lg Electronics Inc. | Wireless power sensor |
| CN114167127A (en) * | 2021-11-24 | 2022-03-11 | 镇江市丹高电器有限公司 | Self-powered current transformer |
-
2018
- 2018-12-06 CN CN201822044158.5U patent/CN209264817U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270337A (en) * | 2018-12-06 | 2019-01-25 | 石家庄杰泰特动力能源有限公司 | Passive and wireless current sensor based on double-winding current mutual inductor |
| US20210109131A1 (en) * | 2019-10-14 | 2021-04-15 | Lg Electronics Inc. | Wireless power sensor |
| CN114167127A (en) * | 2021-11-24 | 2022-03-11 | 镇江市丹高电器有限公司 | Self-powered current transformer |
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