CN215681924U - An intelligent control device for wireless power transmission - Google Patents

An intelligent control device for wireless power transmission Download PDF

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CN215681924U
CN215681924U CN202120720165.1U CN202120720165U CN215681924U CN 215681924 U CN215681924 U CN 215681924U CN 202120720165 U CN202120720165 U CN 202120720165U CN 215681924 U CN215681924 U CN 215681924U
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current
voltage
transmitting
control device
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闵应昌
王彦辉
刘亚栎
王拓
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
    • Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
    • Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission

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Abstract

本实用新型公开了一种电能无线传输智能控制装置，包括控制器、用于电能无线传输的发射模块和接收模块、用于监测系统电压和电流的电气量监测模块、用于自动输出所需交流电压的逆变电路驱动控制模块、RS485通讯模块和无线入网模块；所述控制器连接所述RS485通讯模块和所述无线入网模块，实现对整个电能无线传输系统的智能控制与远程控制。本实用新型能够自动调整系统工作频率、电能输入量监测、电能输出量监测，并实现远程的控制与数据查看。

Figure 202120720165

The utility model discloses an intelligent control device for wireless transmission of electric energy, comprising a controller, a transmitting module and a receiving module for wireless transmission of electric energy, an electric quantity monitoring module for monitoring the voltage and current of a system, and an electric quantity monitoring module for automatically outputting the required alternating current The voltage inverter circuit drives the control module, the RS485 communication module and the wireless network access module; the controller connects the RS485 communication module and the wireless network access module to realize intelligent control and remote control of the entire power wireless transmission system. The utility model can automatically adjust the operating frequency of the system, the monitoring of the power input and the power output, and realize remote control and data viewing.

Figure 202120720165

Description

Electric energy wireless transmission intelligent control device
Technical Field
The utility model relates to an intelligent control device, in particular to an electric energy wireless transmission intelligent control device.
Background
The existing magnetic coupling resonance type wireless power transmission system generally adopts a single transmitting end to a single receiving end, the position of the transmitting end is relatively fixed, the position of the receiving end is generally uncertain, or the relative position of the receiving end and the transmitting end is generally unfixed, over-coupling or under-coupling can occur along with the change of the distance between a transmitting coil and the receiving coil, and the frequency splitting phenomenon easily occurs in the resonance state of the transmitting end and the receiving end during over-coupling, so that whether the wireless power transmission system is in the resonance state needs to be monitored in real time, and when the system is not in the resonance state, the voltage output frequency of an inverter needs to be adjusted, so that the resonant type wireless power transmission system achieves the optimal transmission efficiency. In addition, the monitoring of input voltage and current and output voltage and current is lacked, the state of the whole wireless power transmission system cannot be comprehensively controlled, the intelligent degree is low, the working frequency of the system is not variable, and the wireless power transmission efficiency is low during over-coupling or under-coupling. Therefore, it is urgently needed to provide an intelligent electric energy wireless transmission control device which has high intelligent degree and can automatically adjust the working frequency of the system, monitor the electric energy input quantity and monitor the electric energy output quantity, so that the system can keep a resonance state, or can also transmit electric energy with higher efficiency in a non-resonance state, and the whole electric energy wireless transmission system can be intelligently monitored and controlled.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to provide an electric energy wireless transmission intelligent control device capable of automatically adjusting the working frequency of a system, monitoring the electric energy input quantity and monitoring the electric energy output quantity.
The technical scheme is as follows: the utility model relates to an intelligent control device for wireless transmission of electric energy, which comprises a controller, a transmitting module, a receiving module, an electric quantity monitoring module, an inverter circuit driving control module, an RS485 communication module and a wireless network access module, wherein the transmitting module is used for transmitting electric energy to the receiving module; the transmitting module and the receiving module are used for wireless transmission of electric energy; the electric quantity monitoring module is used for monitoring input alternating current voltage and current, phase difference between the voltage and the current of the transmitting terminal and the current of the receiving module of the system; the inverter circuit driving control module is used for automatically outputting alternating-current voltage with required frequency and phase; the controller is connected with the RS485 communication module and the wireless network access module, and intelligent control and remote control of the whole wireless electric energy transmission system are achieved.
The transmitting module comprises a rectifier, a filter capacitor, a full-bridge inverter, a transmitting terminal resonance compensation capacitor, a transmitting coil and a magnetic core, wherein the transmitting coil is combined with the magnetic core, so that the magnetic induction intensity of the electric energy transmission direction of the transmitting coil is enhanced, the magnetic induction intensity of the electric energy transmission direction is weakened, the purpose of enhancing mutual inductance and improving transmission efficiency is achieved, the transmitting coil is connected with the transmitting terminal resonance compensation capacitor in series, the rectifier is connected with the full-bridge inverter through the filter capacitor, and the high-frequency alternating current output by the full-bridge inverter is input into the transmitting coil
The electric quantity monitoring module comprises a single-phase parameter instrument, a transmitting terminal voltage and current phase difference monitoring circuit and a receiving terminal current monitoring circuit, wherein the single-phase parameter instrument is connected between an alternating current power supply and a rectifier and used for reading the voltage and current values of an input system, and the single-phase parameter instrument has an RS485 communication function and can transmit voltage and current data input into the system to the controller.
The receiving module comprises a receiving coil, a receiving end resonance compensation capacitor and an equivalent load, wherein the receiving coil is connected with the receiving end resonance compensation capacitor and the equivalent load in series.
The inverter circuit driving control module comprises a PWM output module with an RS485 communication function, an MOSFET drive and a full-bridge inverter.
The PWM output module and the MOSFET driver both have at least three independent outputs.
And a receiving end Current Transformer (CT) is arranged in a loop of the receiving module, and the induced weak current passes through the I/V conversion module, the A/D conversion module and the transmitting module and transmits data to the controller through a wireless RS485 module, so that the controller obtains current data of the receiving module.
The transmitting end voltage and current phase difference monitoring circuit is a voltage waveform which is amplified through I/V conversion by a weak current induced by a transmitting end Current Transformer (CT) arranged on a transmitting module and is proportional to the weak current and has the same phase and frequency, the voltage waveform obtained through I/V conversion and one of square wave voltages output by an MOSFET drive circuit are simultaneously input into a phase sensitive detection circuit, wherein the phase and frequency of the square wave voltages are the same as the phase and frequency of the voltage on the transmitting coil, the phase and frequency of the voltage on the transmitting coil can be controlled by a controller through a PWM output module and the MOSFET drive circuit to be output by a full bridge inverter, the magnitude of the voltage output by the phase sensitive detection circuit depends on the phase difference between the voltage and the current on the transmitting coil, namely, the phase difference between the voltage and the current of the transmitting coil can be converted according to the magnitude of the voltage output by the phase sensitive detection circuit, when the phase difference between the voltage of the transmitting terminal and the current is 0 degrees, the wireless electric energy transmission system is in a resonance state. After the voltage output by the phase-sensitive detection circuit passes through the A/D conversion and transmission module, data are transmitted to the controller through the RS485 communication line, so that the controller obtains the phase difference between the voltage and the current of the transmitting terminal, and whether the wireless power transmission system is in a resonance state is judged according to the phase difference.
The controller controls the PWM output module through RS485 according to the obtained phase difference data of the voltage and the current of the transmitting terminal and the current data of the receiving coil, and controls the output frequency and the phase of the full-bridge inverter through the MOSFET drive circuit; or when the distance between the transmitting coil and the receiving coil is changed to cause the frequency splitting phenomenon in the original resonance state, the output frequency of the full-bridge inverter is properly reduced or improved, so that the wireless power transmission with higher efficiency in the non-resonance state is achieved.
Has the advantages that: compared with the prior art, the utility model has the following advantages: 1. the working frequency of an automatic adjustment system, the electric energy input monitoring and the electric energy output monitoring of the electric energy wireless transmission system are realized; 2. remote control and data viewing are realized.
Drawings
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a schematic diagram of the power transmission of the present invention;
FIG. 3 is a circuit diagram of the present invention for monitoring the phase difference between the voltage and the current at the emitting end;
fig. 4 is a combination diagram of a transmitting coil and a T-shaped magnetic core according to the present invention.
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings.
Referring to fig. 1 to 3, an intelligent control device for wireless transmission of electric energy includes a transmitting module, a receiving module, an electric quantity monitoring module, a controller, an inverter circuit driving control module, an RS485 communication module, and a wireless network access module.
As shown in fig. 1, a miniature industrial personal computer is adopted as a controller, the miniature industrial personal computer is connected with an RS485 bus through a USB-to-RS 485 conversion interface and serves as an upper computer, the RS485 address of the miniature industrial personal computer is 00, the RS485 address of a single-phase parameter instrument is 01, the RS485 address of a PWM output module is 02, the RS485 address of an A/D conversion and transmission module of a transmitting end is 03, the A/D conversion and transmission module of a receiving end is connected to the RS485 bus of a system through wireless RS485 communication, and the RS485 address is 04; meanwhile, the miniature industrial personal computer is connected with the wireless 4G module or the wireless 5G module and is connected with the Internet, so that remote control and data checking are realized.
The single-phase parameter instrument is connected between the alternating current power supply and the rectifier, the single-phase parameter instrument measures the voltage and the current value of input alternating current, the current transformer CT at the transmitting end is arranged on the resonant loop at the transmitting end, and the current transformer CT at the receiving end is arranged on the resonant loop at the receiving end; the weak current induced by a receiving end Current Transformer (CT) arranged in a loop of the receiving end passes through an I/V conversion module, an A/D conversion module and a transmitting module, and the data is transmitted to the controller through a wireless RS 485.
The controller controls the output of the PWM output module through RS485 communication, wherein the PWM output module at least has 3 paths of independent outputs, meanwhile, the MOSFET drive circuit also at least has 3 paths of independent outputs, the first path of PWM output is output to the MOSFET drive circuit to control the on-off of V1 and V4 in the full-bridge inverter shown in the 2, the second path of PWM output is output to the MOSFET drive circuit to control the on-off of V2 and V3 in the full-bridge inverter shown in the 2, and the third path of PWM output is output to the MOSFET drive circuit to control the on-off of V in the phase-sensitive detection circuit shown in the 3.
As shown in fig. 2, the rectifier is connected to a full-bridge inverter through a filter capacitor C, and the high-frequency ac output from the full-bridge inverter is input to the transmitting coil; the full-bridge inverter is composed of 4 enhancement type field effect transistors of the same type, and the rectifier is composed of 4 rectifier diodes of the same type.
The transmitting coil LtAnd a resonance compensation capacitor C1In series, a receiving coil LrWith another resonance compensating capacitor C2Are connected in series; the transmitting coil LtAnd a resonance compensation capacitor C1After series connection, the inductance value of the transmitting coil is adjusted according to the formula
Figure BDA0003011722640000041
The natural frequency of the transmitting end can be calculated, and finally, the calculated natural frequency of the transmitting end is equal to or close to the frequency of the high-frequency alternating current output by the inverter.
The receiving coil LrWith another resonance compensating capacitor C2After series connection, the inductance value of the receiving coil is adjusted according to the formula
Figure BDA0003011722640000042
The natural frequency of the receiving end can be calculated, and finally, the calculated natural frequency of the receiving end is equal to or close to the natural frequency of the transmitting end.
The transmitting coil and the receiving coil are disk spiral coils formed by winding litz wires, the number of turns of each layer is 30, the outer diameter of the coil is 20cm, the inner diameter of the coil is 3cm, and the specification of the selected litz wire is 0.1mm multiplied by 90 strands.
Inductance value of the transmitting coil is Lt860 muH, resonance compensation capacitor C1Has a capacitance value of C14.5nF, insert formula
Figure BDA0003011722640000043
F1 was obtained 80.94kHz, and the inductance value of the transmitting coil was adjusted again with a digital bridge: number ofThe measuring frequency of the bridge is adjusted to 80.94kHz, the level voltage is 1v, and the inductance is adjusted while measuring the inductance, so that the inductance value of the transmitting coil under the frequency is Lt860 muh. According to the method for adjusting the inductance value of the transmitting coil, the receiving coil is adjusted to ensure that the material, the size and the inductance value of the transmitting coil and the receiving coil are the same, and finally, the frequency f of the high-frequency alternating current output by the full-bridge inverter is adjusted0So that f080.94kHz, so that the frequency of the transmitting coil voltage is equal to the natural frequency of the transmitting end, which is equal to the natural frequency of the receiving end, i.e. f0＝f1＝f2And finally, magnetic coupling resonant wireless power transmission from the transmitting end to the receiving end is realized, and high-efficiency wireless power transmission is realized.
As shown in FIG. 3, the phase difference monitoring circuit of the transmitting terminal voltage and the current, A1 constitutes an I/V conversion circuit, A2 and A3 constitute a phase-sensitive detection circuit, and the loop of the transmitting terminal is provided with a weak current I induced by a transmitting terminal Current Transformer (CT)ct1The amplified voltage waveform u with the same phase and the same frequency and proportional to the weak current is obtained by I/V conversioni，uiThe output quantity of the I/V conversion and the input quantity of the phase-sensitive detection circuit are ui＝-Ict1Voltage waveform u obtained by R, I/V conversioniThe phase-sensitive detection circuit is simultaneously input with the square wave voltage output by the third path of the MOSFET drive circuit, wherein the phase and frequency of the square wave voltage are the same as those of the voltage on the transmitting coil, the phase and frequency of the voltage on the transmitting coil can be output by the controller through the PWM output module and the MOSFET drive circuit to control the full-bridge inverter, the magnitude of the voltage output by the phase-sensitive detection circuit depends on the phase difference between the voltage and the current on the transmitting coil, namely, the phase difference between the voltage and the current of the transmitting coil can be converted according to the magnitude of the voltage output by the phase-sensitive detection circuit, and the CT direction of a current transformer at the transmitting end is adjusted, so that when the phase difference between the voltage and the current at the transmitting end is 90 degrees, u is outputo0, and uoDifferent emission end voltage and current phase differences are converted by different values, and the conversion relation needs to be calibrated by experiments. When the phase difference between the voltage of the transmitting terminal and the current is 0 DEG, the wireless transmission system of the electric energyIn the resonant state. After the voltage output by the phase-sensitive detection circuit passes through the A/D conversion and transmission module, data are sent to the controller through the RS485 communication line, so that the controller obtains the phase difference between the voltage and the current of the transmitting terminal, and whether the wireless electric energy transmission system is in a resonance state is judged according to the phase difference.
A receiving end Current Transformer (CT) is arranged in a loop of the receiving end, and the weak current induced by the receiving end current transformer passes through an I/V conversion module, an A/D conversion module and a transmitting module and is transmitted to the controller through a wireless RS485 module, so that the controller obtains current data of the receiving coil.
The controller controls the first path and the second path of output of the PWM output module through RS485 according to the obtained phase difference data of the voltage and the current of the transmitting terminal and the current data of the receiving coil, and controls the output frequency and the phase of the full-bridge inverter through the first path and the second path of square wave output of the MOSFET driving circuit; or when the distance between the transmitting coil and the receiving coil is changed to cause the frequency splitting phenomenon in the original resonance state, the output frequency of the full-bridge inverter is properly reduced or improved, so that the wireless power transmission with higher efficiency in the non-resonance state is achieved.
As shown in fig. 4, the direction in which the lines are dense is the electric energy transmission direction of the transmitting coil, the transmitting coil is combined with the magnetic core, the magnetic core may be a T-shaped magnetic core or an E-shaped magnetic core, in this embodiment, the T-shaped magnetic core is selected, so that the magnetic induction intensity in the electric energy transmission direction of the transmitting coil is enhanced, and the magnetic induction intensity in the opposite electric energy transmission direction of the transmitting coil is weakened, so as to achieve the purposes of enhancing the mutual inductance and improving the transmission efficiency.

Claims (7)

1.一种电能无线传输智能控制装置，其特征在于：包括控制器、用于电能无线传输的发射模块和接收模块、用于监测系统电压和电流的电气量监测模块、用于自动输出所需交流电压的逆变电路驱动控制模块、RS485通讯模块和无线入网模块；其中，所述电气量监测模块包括单相参数仪、发射端电压与电流相位差监测电路、接收端电流监测电路，所述单相参数仪连接在交流电源与整流器之间；所述逆变电路驱动控制模块包括具有RS485通讯功能的PWM输出模块、MOSFET驱动以及全桥逆变器，PWM输出模块输出信号控制MOSFET驱动电路，MOSFET驱动电路输出方波控制全桥逆变器；所述电气量监测模块和逆变电路驱动控制模块具有485通信接口，其通信接口接入RS485通讯模块；所述控制器连接所述RS485通讯模块和所述无线入网模块。1. An intelligent control device for wireless transmission of electric energy, characterized in that: it comprises a controller, a transmitter module and a receiver module for wireless transmission of electric energy, an electric quantity monitoring module for monitoring system voltage and current, and a required output for automatic output. AC voltage inverter circuit drive control module, RS485 communication module and wireless network access module; wherein, the electrical quantity monitoring module includes a single-phase parameter meter, a transmitter voltage and current phase difference monitoring circuit, and a receiver current monitoring circuit, the The single-phase parameter meter is connected between the AC power supply and the rectifier; the inverter circuit drive control module includes a PWM output module with RS485 communication function, a MOSFET drive and a full-bridge inverter, and the output signal of the PWM output module controls the MOSFET drive circuit, The MOSFET drive circuit outputs square waves to control the full-bridge inverter; the electrical quantity monitoring module and the inverter circuit drive control module have a 485 communication interface, and the communication interface is connected to the RS485 communication module; the controller is connected to the RS485 communication module and the wireless access module. 2.根据权利要求1所述的控制装置，其特征在于：所述发射模块包括整流器、滤波电容、全桥逆变器、发射端谐振补偿电容、发射线圈以及磁芯，所述发射线圈与磁芯结合，所述发射线圈与发射端谐振补偿电容串联，所述整流器经滤波电容连接全桥逆变器，全桥逆变器输出的高频交流电输入到发射线圈。2. The control device according to claim 1, characterized in that: the transmitting module comprises a rectifier, a filter capacitor, a full-bridge inverter, a transmitting-end resonance compensation capacitor, a transmitting coil and a magnetic core, and the transmitting coil and the magnetic The core is combined, the transmitting coil is connected in series with the resonant compensation capacitor at the transmitting end, the rectifier is connected to the full-bridge inverter through the filter capacitor, and the high-frequency alternating current output by the full-bridge inverter is input to the transmitting coil. 3.根据权利要求1所述的控制装置，其特征在于：所述接收模块包括接收线圈、接收端谐振补偿电容、等效负载，所述接收线圈与接收端谐振补偿电容以及等效负载串联。3 . The control device according to claim 1 , wherein the receiving module comprises a receiving coil, a receiving end resonance compensation capacitor, and an equivalent load, and the receiving coil is connected in series with the receiving end resonance compensation capacitor and the equivalent load. 4 . 4.根据权利要求1所述的控制装置，其特征在于：所述电气量监测模块包括具有RS485通讯功能的单相参数仪、发射端电压与电流相位差监测电路、接收端电流监测电路，所述单相参数仪连接在交流电源与整流器之间，所述单相参数仪将输入到系统的电压和电流数据发送到控制器。4. The control device according to claim 1, characterized in that: the electrical quantity monitoring module comprises a single-phase parameter meter with RS485 communication function, a transmitter voltage and current phase difference monitoring circuit, and a receiver current monitoring circuit. The single-phase parameter meter is connected between the AC power supply and the rectifier, and the single-phase parameter meter sends the voltage and current data input to the system to the controller. 5.根据权利要求1所述的控制装置，其特征在于：所述逆变电路驱动控制模块包括具有RS485通讯功能的PWM输出模块、MOSFET驱动以及全桥逆变器。5 . The control device according to claim 1 , wherein the inverter circuit drive control module comprises a PWM output module with RS485 communication function, a MOSFET drive and a full-bridge inverter. 6 . 6.根据权利要求5所述的控制装置，其特征在于：所述PWM输出模块和所述MOSFET驱动都至少具有三路独立输出。6 . The control device according to claim 5 , wherein both the PWM output module and the MOSFET driver have at least three independent outputs. 7 . 7.根据权利要求3所述的控制装置，其特征在于：所述接收模块的回路装有接收端电流互感器。7 . The control device according to claim 3 , wherein the circuit of the receiving module is equipped with a current transformer at the receiving end. 8 .
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