CN108631422B - Wireless power transmission device and method for underground displacement measurement integrated sensor - Google Patents
Wireless power transmission device and method for underground displacement measurement integrated sensor Download PDFInfo
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- CN108631422B CN108631422B CN201810609356.3A CN201810609356A CN108631422B CN 108631422 B CN108631422 B CN 108631422B CN 201810609356 A CN201810609356 A CN 201810609356A CN 108631422 B CN108631422 B CN 108631422B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 176
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 28
- 238000005259 measurement Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 8
- 238000004891 communication Methods 0.000 claims description 27
- 238000004146 energy storage Methods 0.000 claims description 21
- 230000005669 field effect Effects 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 16
- 238000012546 transfer Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 8
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 8
- 230000006698 induction Effects 0.000 claims description 3
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- 239000003990 capacitor Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
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- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005059 dormancy Effects 0.000 description 1
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- H02J7/025—
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- H02J5/005—
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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Abstract
The invention discloses a wireless power transmission device and a wireless power transmission method for an integrated sensor for underground displacement measurement. The system comprises a plurality of electric energy transmission nodes and an overground total power supply, wherein the overground total power supply is arranged on the ground, and the plurality of electric energy transmission nodes are sequentially arranged at intervals from the ground to the ground bottom; the first power transmission node closest to the ground is connected with the ground main power supply through a metal wire, and the rest power transmission nodes are communicated and powered through the connection. The invention integrates the electric energy transmission coil, the transmitting end circuit, the receiving end circuit and the like into one electric energy transmission node, and forms an electric energy transmission string by a plurality of electric energy transmission nodes at intervals, thereby providing electric energy for the underground displacement integrated sensor and leading the underground displacement integrated sensor to get rid of the constraint of wired power supply.
Description
Technical Field
The invention relates to the field of wireless charging, in particular to a wireless power transmission device and method for an integrated sensor for underground displacement measurement.
Background
Displacement of the deep underground part occurs before and when geological disasters such as landslide, collapse, debris flow, land collapse, subsidence and the like which endanger the life and property safety of people occur. If we can effectively monitor the underground deep displacement, the occurrence of these disasters can be effectively avoided.
At present, the applicant proposes an integrated sensor for underground displacement measurement based on a mutual inductance mechanism for underground deep displacement monitoring. The deformation condition from the ground to the deep underground is measured by measuring the relative variation of two adjacent underground displacement measuring units one by one from top to bottom during measurement.
The power supply and communication between the underground displacement measuring units are all completed through metal wires, and the sealing of the device is affected by the connection mode, and the installation and the transportation are inconvenient. Moreover, as the whole integrated sensor is buried underground for a long time, the metal wires can be corroded by the external environment, so that the sensor cannot work stably. In the event of a thunderstorm, a lightning strike may damage the sensor due to the conductive effect of the metal wire.
The non-contact power supply realizes 'wireless power supply' by using magnetic field coupling, namely, a coil with a transmitting end and a receiving end completely separated is adopted, and electric energy is transmitted through coupling of a high-frequency magnetic field, so that no physical connection exists in the energy transmission process. Thus, the problems existing in the wired power supply of the underground displacement measurement integrated sensor can be effectively solved.
Disclosure of Invention
The invention aims to provide a wireless power transmission device and a wireless power transmission method for an integrated sensor for underground displacement measurement, which are used for providing power for each underground displacement measurement unit so as to enable the integrated sensor to be free from the constraint of wired power supply.
In order to achieve the purpose of the invention, the following technical scheme is adopted:
1. a wireless power transfer device for an integrated sensor for underground displacement measurement:
the device comprises a plurality of electric energy transmission nodes and an overground total power supply, wherein the overground total power supply is arranged on the ground, and the plurality of electric energy transmission nodes are sequentially arranged at intervals from the ground to the ground bottom; the first power transmission node closest to the ground is connected with the ground main power supply through a metal wire, and the rest power transmission nodes are communicated and powered through the connection.
The ground total power supply comprises an AC-DC converter, the input end of the AC-DC converter is connected with the mains supply, the output end of the AC-DC converter is connected with a micro controller MCU of the electric energy transmission node, and the AC-DC converter converts the mains supply into direct current and inputs the direct current to the first electric energy transmission node.
The electric energy transmission node comprises an electric energy transmission coil, a microcontroller MCU, a receiving end circuit, a transmitting end circuit, a switch switching circuit and a wireless communication module; the microcontroller MCU is respectively connected with the receiving end circuit, the transmitting end circuit and the wireless communication module, the receiving end circuit/the transmitting end circuit is connected with the electric energy transmission coil through the double-throw switch, the microcontroller MCU is connected to the double-throw switch through the switch switching circuit, and the control switch enables the electric energy transmission coil to be connected to the receiving end circuit or the transmitting end circuit through the switch.
The receiving end circuit comprises a rectifying and filtering circuit, a tank circuit and a DC-DC converter; the input end of the rectifying and filtering circuit is connected with the electric energy transmission coil through a double-throw switch, the output end of the rectifying and filtering circuit is divided into two paths, one path is connected to the Micro Controller Unit (MCU) through a direct current-direct current (DC-DC) converter, the other path is connected to the energy storage circuit through a single-throw switch, the energy storage circuit is connected to the Micro Controller Unit (MCU), and the Micro Controller Unit (MCU) is connected with the single-throw switch through a switch switching control line.
The transmitting end circuit comprises a coil voltage and current acquisition circuit, an inverter circuit and a frequency modulation driving circuit; the input end of the frequency modulation driving circuit is connected to the Micro Controller Unit (MCU), the output end of the frequency modulation driving circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected to the electric energy transmission coil, a coil voltage and current acquisition circuit is arranged on an electric wire between the output end of the inverter circuit and the electric energy transmission coil, and the micro controller unit is connected with the coil voltage and current acquisition circuit through a coil voltage and current feedback line.
The frequency modulation driving circuit comprises a digital-to-analog conversion circuit, a DDS signal generating circuit and a comparator; the input ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are connected to the micro controller MCU, the output ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are respectively connected to the two input ends of the comparator, and the output end of the comparator is connected to the input end of the inverter circuit; the micro controller MCU controls the digital-to-analog conversion circuit to output an adjustable direct-current voltage signal to the positive input end of the comparator as the reference voltage of the comparator; meanwhile, the micro controller MCU controls the DDS signal generating circuit to output a sine wave voltage signal with adjustable frequency to the reverse input end of the comparator as the comparison voltage of the comparator; the two voltage signals output PWM wave signals to the inverter circuit through the comparator, and the inverter circuit is driven to perform inversion conversion.
The inverter circuit comprises two field effect transistors Q1 and Q2 which are connected in series, wherein the source electrode of one field effect transistor Q1 is connected with the drain electrode of the other field effect transistor Q2, the grid electrodes of the two field effect transistors Q1 and Q2 are connected to the output end of the frequency modulation driving circuit, and the source electrodes and the drain electrodes of the two field effect transistors Q1 are connected through diodes; the source and drain ends of the field effect transistor Q2 are respectively connected to the two ends of the power transmission coil.
2. A wireless power transmission method for an integrated sensor for underground displacement measurement comprises the following steps:
the wireless power transmission device supplies power to a first power transmission node closest to the ground by a ground main power supply, and the power is stored in a storage circuit of a receiving end circuit through a microcontroller MCU; then, the adjacent two power transmission nodes transmit power in the following manner, so that the first power transmission node serves as the last power transmission node, and the next power transmission node transmits power one by one: in the last power transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit through the control signal from the wireless communication module, so that the power transmission coil is connected with the transmitting end circuit, and the microcontroller MCU acquires the received power transmission coil voltage and current value in real time according to the power from the coil voltage and current acquisition circuit, acquires power from the energy storage circuit in the receiving end circuit and sends a current transmission signal to the frequency modulation driving circuit, and drives the inversion circuit to transmit current to the power transmission coil through the frequency modulation driving circuit; generating a magnetic field after the power transmission coil of the last power transmission node is electrified, and receiving the magnetic field by the induction of the power transmission coil of the next power transmission node; in the next power transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit through the control signal from the wireless communication module, so that the power transmission coil is connected with the receiving end circuit, the microcontroller MCU receives the power transmission coil voltage and current value acquired by the coil voltage and current acquisition circuit in real time, sends a current control signal to the frequency modulation driving circuit, and drives the inversion circuit to transmit alternating current to the power transmission coil through the frequency modulation driving circuit; the electric energy received by the electric energy transmission coil is stored in an energy storage circuit in the receiving end circuit through the rectifying and filtering circuit and simultaneously supplies power for the microcontroller MCU.
The invention has the beneficial effects that:
the invention integrates the electric energy transmission coil, the transmitting end circuit, the receiving end circuit and the like into one electric energy transmission node, a plurality of electric energy transmission nodes are separated by a certain distance to form an electric energy transmission string, and then the ground total power supply processes each electric energy transmission node, thereby providing electric energy for the underground displacement integrated sensor and leading the underground displacement integrated sensor to get rid of the constraint of wired power supply.
Drawings
Fig. 1 is a schematic diagram of a wireless power transmission device, in which 1 to M represent power transmission nodes; a represents the ground total power supply.
Fig. 2 is a circuit configuration diagram of a wireless power transfer node.
Fig. 3 is a circuit configuration diagram of a receiving-end circuit of the wireless power transfer node.
Fig. 4 is a circuit configuration diagram of a transmitting-side circuit of the wireless power transfer node.
Fig. 5 is a schematic diagram of an inverter circuit.
Fig. 6 is a diagram showing the configuration of a frequency modulation driving circuit of a transmitting side circuit.
Fig. 7 is a diagram showing the structure of the ground total power supply circuit.
Fig. 8 is a workflow diagram.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings:
as shown in fig. 1, the system comprises a plurality of power transmission nodes and an overground total power supply, wherein the overground total power supply is arranged on the ground, and the plurality of power transmission nodes are sequentially arranged at intervals from the ground to the ground bottom; the first power transmission node closest to the ground is connected with the ground main power supply through a metal wire, and the rest power transmission nodes are communicated and powered through the connection.
When power is transmitted, the electric energy stored in the last electric energy transmission node is transmitted to the next electric energy transmission node through the magnetic field coupling effect generated by the coil, and each electric energy transmission node is internally provided with the underground displacement measurement integrated sensor, so that the electric energy of the ground total power supply is transmitted to each electric energy transmission node in sequence downwards, and the whole underground displacement measurement integrated sensor is supplied with power.
In specific implementation, as shown in fig. 1, the system is formed by arranging 1-M electric energy transmission nodes in sequence from bottom to top at intervals along a vertical straight line, wherein an underground displacement measurement integrated sensor is installed in each electric energy transmission node, and the Mth electric energy transmission node is connected with an overground total power supply through a metal wire.
As shown in fig. 7, the above-ground total power supply includes an AC-DC converter, an input end of the AC-DC converter is connected to the mains supply, an output end of the AC-DC converter is connected to the micro controller MCU of the power transmission node, and the AC-DC converter converts the mains supply into direct current and inputs the direct current to the first power transmission node to supply power to the micro controller MCU, the wireless communication module, etc. in the first power transmission node.
The wireless communication module is used for wireless communication transmission of control signals between adjacent power transmission nodes.
The composition of the power transfer node is shown in fig. 2. Within the dashed box in the figure are the circuit parts of the wireless power transfer node, which are soldered with miniature chip components to a printed circuit board having a diameter smaller than the inner diameter of the inner frame of the coil, which circuit board is placed in the coil and constitutes the wireless power transfer node together with the coil.
The electric energy transmission node comprises an electric energy transmission coil, a microcontroller MCU, a receiving end circuit, a transmitting end circuit, a switch switching circuit and a wireless communication module; the microcontroller MCU is respectively connected with the receiving end circuit, the transmitting end circuit and the wireless communication module, the receiving end circuit/the transmitting end circuit is connected with the electric energy transmission coil through the double-throw switch, the microcontroller MCU is connected to the double-throw switch through the switch switching circuit, and the control switch enables the electric energy transmission coil to be connected to the receiving end circuit or the transmitting end circuit through the switch.
In specific implementation, the microcontroller MCU adopts a singlechip STM32F103RBT6 produced by Italian semiconductor company as a core, and the wireless communication module can be an integrated circuit CC1101 or integrated circuits of other types.
The wireless communication module of the current power transmission node receives a control signal from the last power transmission node, and the micro controller MCU controls the conduction direction of the double-throw switch through the switch switching circuit, so that the power transmission coil is connected with the receiving end circuit or the transmitting end circuit.
When the electric energy transmission coil is connected with the receiving end circuit, the electric energy transmission node is used as a receiving node, electric energy received by the electric energy transmission coil is stored through the receiving end circuit, the microcontroller MCU controls the receiving end circuit to store electric energy after receiving a control signal from the wireless communication module, and the electric energy is supplied to the microcontroller MCU, the wireless communication module and the transmitting end circuit when being used as a transmitting node after being stored.
When the electric energy transmission coil is connected with the transmitting end circuit, the electric energy transmission node is used as the transmitting node, and the microcontroller MCU controls the transmitting end circuit to generate an excitation signal after receiving a control signal from the wireless communication module so that the electric energy transmission coil transmits electric energy, and the electric energy is inducted and received by the electric energy transmission coil of the other electric energy transmission node after transmitting.
The microcontroller MCU in the circuit of FIG. 2 receives the signal from the wireless communication module of the previous wireless power transfer node through the wireless communication module of the wireless power transfer node itself, and determines the working state of the wireless power transfer node.
When the microcontroller MCU does not receive the signal for connecting the electric energy coil with the receiving end circuit and the transmitting end circuit from the wireless communication module, the microcontroller MCU enables the transmitting end circuit to generate circuit dormancy through the control line, and meanwhile, the switch is not connected with the transmitting end circuit and the receiving end circuit.
As shown in fig. 3, the receiving-end circuit includes a rectifying and filtering circuit, a tank circuit and a DC-DC converter; the input end of the rectification filter circuit is connected with the electric energy transmission coil through a double-throw switch, the output end of the rectification filter circuit is divided into two paths, one path is connected with the Micro Controller Unit (MCU) through a direct current-direct current (DC-DC) converter, the other path is connected with the energy storage circuit through a single-throw switch, the energy storage circuit is connected with the Micro Controller Unit (MCU), and the Micro Controller Unit (MCU) is connected with the single-throw switch through a switch switching control line; the rectification filter circuit rectifies and filters alternating current received by the electric energy transmission coil into direct current, one path converts voltage into voltage which accords with the work of the microcontroller MCU through the DC-DC converter to supply power for the microcontroller MCU, the other path is connected with the energy storage circuit through a switch switching control line under the control of the microcontroller MCU, and energy received by the electric energy transmission coil is stored in the energy storage circuit; the microcontroller MCU receives the electric energy from the energy storage circuit and simultaneously sends a control signal to the energy storage circuit to balance and save energy in the energy storage process.
In particular, the rectifying circuit may be a bridge rectifier or other topological circuit composed of diodes. The filter element selects an electrolytic capacitor and is connected to the output end of the rectifying circuit.
As shown in fig. 4, the transmitting-end circuit comprises a coil voltage and current acquisition circuit, an inverter circuit and a frequency modulation driving circuit; the input end of the frequency modulation driving circuit is connected to the Micro Controller Unit (MCU), the output end of the frequency modulation driving circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected to the electric energy transmission coil, a coil voltage and current acquisition circuit is arranged on an electric wire between the output end of the inverter circuit and the electric energy transmission coil, and the micro controller unit is connected with the coil voltage and current acquisition circuit through a coil voltage and current feedback line.
The microcontroller MCU receives electric energy from the energy storage circuit in the receiving end circuit and transmits the electric energy to the inversion circuit through the frequency modulation driving circuit, the inversion circuit inverts direct current from the energy storage circuit into high-frequency alternating current, and the high-frequency alternating current is fed into the electric energy transmission coil through the coil voltage current acquisition circuit, and the electric energy transmission coil transmits electric energy outwards; the coil voltage and current acquisition circuit acquires the voltage and current value feedback of the electric energy transmission coil in real time and sends the voltage and current value feedback to the micro controller MCU, and the micro controller MCU adjusts the output of the frequency modulation driving circuit according to the fed back voltage and current value, so that the inverter circuit generates optimal high-frequency alternating current, and the transmitting end circuit works in an optimal state.
The microcontroller MCU adopts a singlechip.
As shown in fig. 6, the fm driving circuit includes a digital-to-analog conversion circuit, a DDS signal generation circuit, and a comparator; the input ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are connected to the micro controller MCU, the output ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are respectively connected to the two input ends of the comparator, and the output end of the comparator is connected to the input end of the inverter circuit; the micro controller MCU controls the digital-to-analog conversion circuit to output an adjustable direct-current voltage signal to the positive input end of the comparator as the reference voltage of the comparator; meanwhile, the micro controller MCU controls the DDS signal generating circuit to output a sine wave voltage signal with adjustable frequency to the reverse input end of the comparator as the comparison voltage of the comparator; the two voltage signals output PWM wave signals with fixed frequency and fixed duty ratio to the inverter circuit through the comparator, and the inverter circuit is driven to perform inversion conversion.
In the specific implementation, a power MOSFET switch tube produced by Infineon company is selected as a power switch tube in the circuit, and a D-type topological structure is adopted in the circuit. The digital-to-analog conversion circuit can adopt an MCU internal D/A or an external D/A, and the DDS signal generation circuit adopts an AD9851 integrated circuit.
As shown in fig. 5, the inverter circuit includes two field effect transistors Q1 and Q2 connected in series, the source electrode of one field effect transistor Q1 is connected with the drain electrode of the other field effect transistor Q2, the gates of the two field effect transistors Q1 and Q2 are connected to the output end of the frequency modulation driving circuit, and the source electrodes and the drain electrodes of the two field effect transistors Q1 are connected through diodes; the source electrode and the drain electrode of the field effect tube Q2 are respectively connected to the two ends of the electric energy transmission coil, and the connection part of the source electrode of one field effect tube Q1 and the drain electrode of the other field effect tube Q2 is connected with the electric energy transmission coil after passing through a capacitor.
As shown in fig. 8, the wireless power transmission process embodying the present invention is as follows:
the wireless power transmission device supplies power to a first power transmission node closest to the ground by a ground main power supply, and the power is stored in a storage circuit of a receiving end circuit through a microcontroller MCU; then, the adjacent two power transmission nodes transmit power in the following manner, so that the first power transmission node serves as the last power transmission node, and the next power transmission node transmits power one by one:
in the last electric energy transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit through the control signal from the wireless communication module, so that the electric energy transmission coil is connected with the transmitting end circuit, the last electric energy transmission node is used as the transmitting node, the microcontroller MCU acquires electric energy from the energy storage circuit in the receiving end circuit according to the electric energy transmission coil voltage and current value acquired and received by the coil voltage and current acquisition circuit in real time and sends a current transmission signal to the frequency modulation driving circuit, and the frequency modulation driving circuit drives the inverter circuit to transmit current to the electric energy transmission coil;
generating a magnetic field after the power transmission coil of the last power transmission node is electrified, and receiving the magnetic field by the induction of the power transmission coil of the next power transmission node;
in the next power transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit by a control signal from the wireless communication module, so that the power transmission coil is connected with the receiving end circuit, the next power transmission node is used as the receiving node,
the microcontroller MCU receives the electric energy transmission coil voltage and current value acquired by the coil voltage and current acquisition circuit in real time, sends a current control signal to the frequency modulation driving circuit, and drives the inverter circuit to transmit optimal high-frequency alternating current to the electric energy transmission coil through the frequency modulation driving circuit;
the electric energy received by the electric energy transmission coil is stored in an energy storage circuit in the receiving end circuit through the rectifying and filtering circuit and simultaneously supplies power for a microcontroller MCU, and the microcontroller MCU monitors the energy storage condition of the energy storage circuit and communicates with the microcontroller MCU of the last electric energy transmission node through a wireless communication module to coordinate the electric energy transmission process.
Before the original work, the power transmission coil is connected to the receiving end circuit.
After the transmission of the electric energy between the previous electric energy transmission node and the next electric energy transmission node is completed, the next electric energy transmission node continues to transmit the electric energy to the next electric energy transmission node in the mode through communication between the wireless communication modules.
When the invention works, in the process of electric energy transmission between two adjacent electric energy transmission nodes, all other electric energy transmission nodes do not work, and the electric energy transmission coils in the other electric energy transmission nodes do not work under the control of respective micro controller MCU.
When power is transmitted, the electric energy stored in the last electric energy transmission node is transmitted to the next electric energy transmission node through the magnetic field coupling effect generated by the coil, and the underground displacement measurement integrated sensor is arranged in the electric energy transmission node, so that the electric energy of the ground total power supply is transmitted to each electric energy transmission node downwards in sequence, and the whole underground displacement measurement integrated sensor is supplied with power.
Claims (4)
1. A wireless power transmission method for an integrated sensor for underground displacement measurement is characterized in that:
the method adopts a wireless power transmission device, wherein the wireless power transmission device comprises a plurality of power transmission nodes and an overground total power supply, the overground total power supply is arranged on the ground, and the plurality of power transmission nodes are sequentially arranged at intervals from the ground to the ground bottom; the first electric energy transmission node closest to the ground is connected with a ground main power supply through a metal wire, and all other electric energy transmission nodes are communicated and powered through connection;
the electric energy transmission node comprises an electric energy transmission coil, a microcontroller MCU, a receiving end circuit, a transmitting end circuit, a switch switching circuit and a wireless communication module; the microcontroller MCU is respectively connected with the receiving end circuit, the transmitting end circuit and the wireless communication module, the receiving end circuit/the transmitting end circuit is connected with the electric energy transmission coil through the double-throw switch, the microcontroller MCU is connected to the double-throw switch through the switch switching circuit, and the control switch enables the electric energy transmission coil to be connected to the receiving end circuit or the transmitting end circuit through the switch;
the receiving end circuit comprises a rectifying and filtering circuit, a tank circuit and a DC-DC converter; the input end of the rectification filter circuit is connected with the electric energy transmission coil through a double-throw switch, the output end of the rectification filter circuit is divided into two paths, one path is connected with the Micro Controller Unit (MCU) through a direct current-direct current (DC-DC) converter, the other path is connected with the energy storage circuit through a single-throw switch, the energy storage circuit is connected with the Micro Controller Unit (MCU), and the Micro Controller Unit (MCU) is connected with the single-throw switch through a switch switching control line;
the transmitting end circuit comprises a coil voltage and current acquisition circuit, an inverter circuit and a frequency modulation driving circuit; the input end of the frequency modulation driving circuit is connected to the Micro Controller Unit (MCU), the output end of the frequency modulation driving circuit is connected with the input end of the inverter circuit, the output end of the inverter circuit is connected to the electric energy transmission coil, a coil voltage and current acquisition circuit is arranged on an electric wire between the output end of the inverter circuit and the electric energy transmission coil, and the micro controller unit is connected with the coil voltage and current acquisition circuit through a coil voltage and current feedback line;
the method specifically comprises the following steps:
the wireless power transmission device supplies power to a first power transmission node closest to the ground by a ground main power supply, and the power is stored in a storage circuit of a receiving end circuit through a microcontroller MCU; then, the adjacent two power transmission nodes transmit power in the following manner, so that the first power transmission node serves as the last power transmission node, and the next power transmission node transmits power one by one:
in the last power transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit through the control signal from the wireless communication module, so that the power transmission coil is connected with the transmitting end circuit, and the microcontroller MCU acquires the received power transmission coil voltage and current value in real time according to the power from the coil voltage and current acquisition circuit, acquires power from the energy storage circuit in the receiving end circuit and sends a current transmission signal to the frequency modulation driving circuit, and drives the inversion circuit to transmit current to the power transmission coil through the frequency modulation driving circuit;
generating a magnetic field after the power transmission coil of the last power transmission node is electrified, and receiving the magnetic field by the induction of the power transmission coil of the next power transmission node;
in the next power transmission node, the microcontroller MCU controls the conduction direction of the double-throw switch through the switch switching circuit through the control signal from the wireless communication module, so that the power transmission coil is connected with the receiving end circuit, the microcontroller MCU receives the power transmission coil voltage and current value acquired by the coil voltage and current acquisition circuit in real time, sends a current control signal to the frequency modulation driving circuit, and drives the inversion circuit to transmit alternating current to the power transmission coil through the frequency modulation driving circuit; the electric energy received by the electric energy transmission coil is stored in an energy storage circuit in the receiving end circuit through the rectifying and filtering circuit and simultaneously supplies power for the microcontroller MCU.
2. A wireless power transfer method for an integrated sensor for underground displacement measurement according to claim 1, wherein:
the ground total power supply comprises an AC-DC converter, the input end of the AC-DC converter is connected with the mains supply, the output end of the AC-DC converter is connected with a micro controller MCU of the electric energy transmission node, and the AC-DC converter converts the mains supply into direct current and inputs the direct current to the first electric energy transmission node.
3. A wireless power transfer method for an integrated sensor for underground displacement measurement according to claim 2, wherein:
the frequency modulation driving circuit comprises a digital-to-analog conversion circuit, a DDS signal generating circuit and a comparator; the input ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are connected to the micro controller MCU, the output ends of the digital-to-analog conversion circuit and the DDS signal generation circuit are respectively connected to the two input ends of the comparator, and the output end of the comparator is connected to the input end of the inverter circuit; the micro controller MCU controls the digital-to-analog conversion circuit to output an adjustable direct-current voltage signal to the positive input end of the comparator as the reference voltage of the comparator; meanwhile, the micro controller MCU controls the DDS signal generating circuit to output a sine wave voltage signal with adjustable frequency to the reverse input end of the comparator as the comparison voltage of the comparator; the two voltage signals output PWM wave signals to the inverter circuit through the comparator, and the inverter circuit is driven to perform inversion conversion.
4. A wireless power transfer method for an integrated sensor for underground displacement measurement according to claim 2, wherein:
the inverter circuit comprises two field effect transistors Q1 and Q2 which are connected in series, wherein the source electrode of one field effect transistor Q1 is connected with the drain electrode of the other field effect transistor Q2, the grid electrodes of the two field effect transistors Q1 and Q2 are connected to the output end of the frequency modulation driving circuit, and the source electrodes and the drain electrodes of the two field effect transistors Q1 are connected through diodes; the source and drain ends of the field effect transistor Q2 are respectively connected to the two ends of the power transmission coil.
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| CN201810609356.3A CN108631422B (en) | 2018-06-13 | 2018-06-13 | Wireless power transmission device and method for underground displacement measurement integrated sensor |
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| CN201810609356.3A CN108631422B (en) | 2018-06-13 | 2018-06-13 | Wireless power transmission device and method for underground displacement measurement integrated sensor |
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