CN113809838B - Frequency self-tuning double-receiving-end wireless power transmission and communication device for landslide monitoring - Google Patents
Frequency self-tuning double-receiving-end wireless power transmission and communication device for landslide monitoring Download PDFInfo
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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
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
-
- 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
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
- H04B5/24—Inductive coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
- H04B5/48—Transceivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a frequency self-tuning double-receiving-end wireless power transmission and communication device for landslide monitoring, which comprises a wireless power transmission transmitting end, a wireless power transmission receiving end and a Lora wireless communication module, wherein the wireless power transmission transmitting end comprises a transmitting coil and a transmitting end circuit board connected with the transmitting coil, the transmitting end circuit board obtains a resonance point and generates resonance PWM (pulse width modulation) pulses by adopting a gradient descent sweep frequency optimizing algorithm based on a voltage signal output by a full-bridge inverter circuit, and the conduction of MOSFET (metal oxide semiconductor field effect transistor) tubes in the full-bridge inverter circuit is controlled to realize closed-loop control of the resonance state of a wireless power transmission system; the wireless power transmission receiving end is used for coupling with wireless power transmission, and the electric energy of the transmitting end is conditioned by adopting a double receiving coil set and then is supplied to the measuring unit outside the hole for use; and the Lora wireless communication module is used for wireless transparent transmission of data inside and outside the hole and uploading the data to the ground host. The invention can realize automatic, rapid and high-precision tuning of the frequency of the underground wireless power transmission system and improve the power transmission efficiency and the distance fluctuation stability.
Description
Technical Field
The invention relates to the technical field of wireless power transmission and wireless communication inside and outside an underground hole, in particular to a frequency self-tuning dual-receiving-end wireless power transmission and communication device for landslide monitoring.
Background
Landslide is a natural geological disaster with great harm to life and property of the country and people, and the landslide belt is monitored in real time, so that the personal and property losses of the country and people can be reduced. The landslide monitoring device is used as a landslide prevention, prediction and early warning tool to play a key role in the temporary arrival of landslide. As shown in fig. 1, the landslide monitoring device is usually placed in a narrow vertical hole, the instruments and equipment in the hole are far away from the earth surface, and the sensing detection unit is embedded in the soil body, so that effective power supply and communication are basic guarantees for realizing reliable work.
At present, a power supply communication scheme of the landslide monitoring medium-hole outer soil monitoring equipment generally adopts wired power supply and communication, but the mode has potential safety hazards of easy aging of wires, exposed metal and the like, and the monitoring depth is shallow; the resonant magnetic coupling wireless power transmission (MR-WPT) has the advantages of high efficiency, no contact, high safety and the like, gradually becomes a new scheme for supplying power to the electronic industry, and meanwhile, the Lora wireless communication technology has the characteristics of high efficiency, no contact and penetrability of a light soil layer. Therefore, the MR-WPT and the lora communication technology are applied to landslide monitoring underground equipment, the problem that the underground equipment is difficult to supply power and communicate can be well solved, and the trouble caused by long-distance wired charging and signal transmission is avoided.
The landslide monitoring underground environment is complex, the change of medium around the receiving and transmitting coils and the change of the relative position between the coils can be caused by the lifting of the water level, the ageing and loosening of the cable and the occurrence of the landslide, so that the resonance frequency of the single-receiving-end MR-WPT system is offset, and the efficiency and the stability of the system are reduced. Currently, frequency automatic tuning technology of an MR-WPT system has been studied, but most of the frequency automatic tuning technology is based on a method of a receiving end, and the tuning modes have poor effects for the case that a transmitting end and a receiving end are positioned in a soil medium and an air medium.
Disclosure of Invention
Aiming at the problems, the invention provides a frequency self-tuning double-receiving-end wireless power transmission and communication device for landslide monitoring, which aims to track a wireless power transmission resonance point of a system by a frequency self-tuning method and solve the problems of unstable wireless power transmission and data transmission of a long transmission distance under landslide monitoring.
In order to achieve the above object, the present invention provides a frequency self-tuning dual-receiver wireless power transmission and communication device for landslide monitoring, comprising: the wireless power transmission system comprises a wireless power transmission transmitting end, a wireless power transmission receiving end and a Lora wireless communication module;
the wireless power transmission transmitting end and the wireless power transmission receiving end are in communication connection through the Lora wireless communication module;
the wireless power transmission transmitting end is used for inverting direct current transmitted by the armored cable and then transmitting the direct current to the wireless power transmission receiving end through magnetic resonance coupling, and comprises a transmitting coil and a transmitting end circuit board connected with the transmitting coil, wherein the transmitting coil is wound on the in-hole measuring unit and connected with the resonance capacitor and then connected with the transmitting end circuit board through an enameled wire;
the wireless power transmission receiving end is used for being coupled with wireless power transmission, conditioning electric energy of the wireless power transmission transmitting end and then supplying the conditioned electric energy to the out-hole measuring unit for use, and comprises a double receiving coil set and a receiving end circuit board connected with the double receiving coil set, wherein the double receiving coil set is wound on a sleeve, connected with a resonance capacitor and then connected with the receiving end circuit board;
the Lora wireless communication module comprises an in-hole Lora receiving module and an out-hole Lora transmitting module, and is used for wireless transparent transmission of in-hole and out-hole data and uploading to a ground host through the serial port communication module.
Further, the transmitting-end circuit board includes: the device comprises an in-hole unit direct-current power supply, an MCU controller, a serial port communication module, a full-bridge MOS driving circuit, a full-bridge inverter circuit and a voltage acquisition circuit;
the in-hole unit direct current power supply is respectively connected with the MCU controller, the full-bridge MOS driving circuit, the voltage acquisition circuit and the full-bridge inverter circuit and supplies power; the MCU controller is connected with the full-bridge MOS driving circuit, controls the full-bridge MOS driving circuit through the tuned high-frequency driving signal, outputs high-frequency current and drives the full-bridge inverter circuit connected with the full-bridge MOS driving circuit; the full-bridge inverter circuit is connected with the transmitting coil, the transmitting coil converts high-frequency current into electromagnetic energy and sends the electromagnetic energy to the wireless power transmission receiving end, and the serial communication module is connected with the armored cable.
Further, the MCU controller includes: the device comprises a gradient descent sweep algorithm module, a PWM pulse generator, a comparator and an AD converter;
the AD converter is connected with the voltage acquisition circuit and then connected with the comparator, the comparator is connected with the gradient descent frequency sweep algorithm module, and the gradient descent frequency sweep algorithm module is connected with the PWM pulse generator; the voltage acquisition circuit detects an output voltage signal of the full-bridge inverter circuit, the output voltage signal is transmitted to the comparator after passing through the AD converter, and minimum value optimization is carried out based on a gradient descent frequency sweep algorithm to obtain a resonant frequency; and controlling the PWM pulse generator to drive the full-bridge inverter circuit through the resonance frequency, so that the wireless power transmission system works in a resonance state, and realizing closed-loop control of the resonance state of the wireless power transmission system.
Further, the receiving-end circuit board includes: the full-bridge rectifier circuit, the voltage stabilizing filter circuit and the charging switching circuit;
the dual receiving coils are connected with the full-bridge rectifying circuit, the full-bridge rectifying circuit is connected with the voltage stabilizing filter circuit, the voltage stabilizing filter circuit is connected with the charging switching circuit, and electric energy is transmitted to the full-bridge rectifying circuit through coupling between the transmitting coils and the dual receiving coil groups and reaches the measuring unit outside the hole through the voltage stabilizing filter circuit and the charging switching circuit.
Further, the charging switching circuit comprises a charging circuit, a lithium battery, a power battery switching circuit and a boost circuit;
the voltage stabilizing filter circuit is connected with the charging circuit, and the charging circuit is connected with the lithium battery and charges the lithium battery; the power battery switching circuit is connected with the lithium battery and the voltage stabilizing filter circuit respectively and then connected with the boost circuit; when in power supply, current sequentially passes through the voltage stabilizing filter circuit, the power battery switching circuit and the boost circuit to supply power to the out-hole measuring unit, and simultaneously passes through the voltage stabilizing filter circuit and the charging circuit to charge the lithium battery; when the charging circuit is powered off, current passes through the lithium battery, the power battery switching circuit and the boost circuit to supply power to the out-hole measuring unit.
Further, the minimum value optimizing is performed based on the gradient descent frequency sweep algorithm to obtain the resonance frequency, which specifically comprises the following steps:
s1, the MCU controller sets initial output angular frequency omega 0 By the initial output angular frequency omega 0 The full-bridge inverter circuit is driven to work, and meanwhile the voltage acquisition circuit detects the voltage of the output end of the full-bridge inverter circuit as U LC0 ；
S2, calculating omega 0 The MCU controller detects omega according to the set resonant frequency angular frequency adjustment quantity delta omega at the approximate slope 0 -delta omega the full-bridge inverter circuit output voltage as U LC1 ；
S3, detecting omega 0 The output end voltage of the full-bridge inverter circuit at +delta omega is used as U LC2 The method comprises the steps of carrying out a first treatment on the surface of the Omega at this time 0 The approximate slope at (U) is set to LC2 -U LC1 ) Setting the scanning step length of the gradient descent sweep frequency optimizing algorithm to be S=eta (U) LC2 -U LC1 ) 2 delta omega, wherein eta represents the learning rate representing the speed of the scan iteration;
s4, scanning step length based on set gradient descent sweep frequency optimizing algorithm to obtain smaller working angle frequency omega respectively 1 ＝ω 0 S, and a greater operating angular frequency omega 2 ＝ω 0 +S, wherein the voltages at the output ends of the corresponding full-bridge inverter circuits are U respectively LCS1 And U LCS2 Setting the resolution as DeltaU by comparing U LCS1 、U LC1 、U LCS2 The MCU microcontroller marks the minimum value as the next U LC0 Temporary storage;
s5, returning to the step S1, resetting the initial output angular frequency, and adjusting for a plurality of times to obtain the final product LCS1 、U LC1 、U LCS2 And when the maximum difference is smaller than the resolution delta U, stopping scanning at the moment, and finally enabling the output voltage of the full-bridge inverter circuit to be minimum, so that the wireless power transmission system reaches a resonance state.
The invention can automatically correct the offset of the resonance point to enable the underground wireless power transmission system to quickly and accurately return to the resonance state, realize the closed-loop control of the resonance state of the wireless power transmission system and improve the power transmission efficiency of wireless power transmission; the adoption of the double receiving coil sets further enhances the distance fluctuation stability of the wireless power transmission system and the overall efficiency of the system; wireless penetration communication of data inside and outside the hole is realized through Lora wireless penetration communication. In conclusion, the invention solves the problems of high-efficiency stable power supply and data transmission of in-situ measurement of landslide monitoring underground slide belt soil.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 is a schematic diagram of a frequency self-tuning dual-receiving-end wireless power transmission and communication device arrangement for landslide monitoring;
fig. 2 is a schematic structural diagram of a frequency self-tuning dual-receiving-end wireless power transmission and communication device for landslide monitoring provided by the invention;
fig. 3 is a topology diagram of a full-bridge inverter circuit of the frequency self-tuning dual-receiving-end wireless power transmission and communication device for landslide monitoring provided by the invention;
fig. 4 is an equivalent circuit diagram of a dual-receiving-end coil set in the dual-receiving-end wireless power transmission and communication device with self-tuning frequency for landslide monitoring provided by the invention;
FIG. 5 is a schematic diagram of a frequency self-tuning dual-receiver wireless power transmission and communication device gradient descent sweep frequency optimizing algorithm for landslide monitoring;
FIG. 6 is a flow chart of a frequency self-tuning dual-receiver wireless power transmission and communication device resonant frequency tracking tuning algorithm for landslide monitoring;
fig. 7 is a comparison of efficiency of the frequency self-tuned dual-receiver wireless power transmission and communication device for landslide monitoring and the single-receiver wireless charging system provided by the invention.
Detailed Description
Various exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.
The present invention will be further described in detail below with reference to specific embodiments and with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Referring to fig. 1 to 7, an embodiment of the present invention provides a frequency self-tuning dual-receiving end wireless power transmission and communication device for landslide monitoring, which includes a wireless power transmission transmitting end 1, a wireless power transmission receiving end 2, and a Lora wireless communication module 4 for powering an out-hole measuring unit 3 and communicating outside and inside a hole.
In this embodiment, referring to fig. 1 and 2, a wireless power transmission transmitting terminal 1 includes a transmitting terminal circuit board 11 and a transmitting coil 12, an armoured cable 6 supplies power to an in-hole measuring unit 5, and the transmitting coil 12 is wound on the in-hole measuring unit 5, and is connected with a resonant capacitor and then connected with the transmitting terminal circuit board 11 through an enameled wire;
the transmitting-end circuit board 11 includes: the device comprises an in-hole unit direct current power supply 111, an MCU controller 112, a serial port communication module 116, a full-bridge MOS driving circuit 113, a full-bridge inverter circuit 114 and a voltage acquisition circuit 115;
the in-hole unit direct current power supply 111 is respectively connected with the MCU controller 112, the full-bridge MOS driving circuit 113, the voltage acquisition circuit 115 and the full-bridge inverter circuit 114 and supplies power; the MCU controller 112 is connected to the full-bridge MOS drive circuit 113, and the MCU controller 112 controls the full-bridge MOS drive circuit 113 by the tuned high-frequency drive signal, outputs a high-frequency current, and drives the full-bridge inverter circuit 114 connected to the full-bridge MOS drive circuit 113; the full-bridge inverter circuit 114 is connected to the transmitting coil 12, the transmitting coil 12 converts high-frequency current into electromagnetic energy and transmits the electromagnetic energy to the wireless power transmission receiving end 2, and the serial communication module 116 is connected to the armoured cable 6.
The MCU controller 112 includes: a gradient descent sweep algorithm module 1121, a PWM pulse generator 1123, a comparator 1122, an AD converter 1124; the AD converter 1124 is connected to the voltage acquisition circuit 115, and then connected to the comparator 1122, the comparator 1122 is connected to the gradient-falling sweep algorithm module 1121, and the gradient-falling sweep algorithm module 1121 is connected to the PWM pulse generator 1123; the voltage acquisition circuit 115 detects an output voltage signal of the full-bridge inverter circuit 114, the output voltage signal is transmitted to the comparator 1122 after passing through the AD converter 1124, and the minimum value is optimized by using a gradient descent sweep frequency optimizing algorithm to obtain the resonant frequency; the resonance frequency obtained by the gradient descent sweep frequency optimizing algorithm module 1112 controls the PWM pulse generator 1123 to drive the full-bridge inverter circuit 114, so that the wireless power transmission system works in a resonance state, and closed-loop control of the resonance state of the wireless power transmission system is realized.
In this embodiment, referring to fig. 1 and 2, the wireless power transmission receiving end 2 includes a receiving end circuit board 21 and a dual receiving coil set, where the dual receiving coil set includes a receiving coil 221 and a receiving coil 222, which are respectively wound on a sleeve 7 and connected with a resonant capacitor, and then connected with the receiving end circuit board 21; the receiving-end circuit board 21 comprises a full-bridge rectifying circuit 211, a voltage stabilizing and filtering circuit 212 and a charging switching circuit 213, and electric energy is transmitted to the full-bridge rectifying circuit 211 through coupling between the transmitting coil 12 and the double receiving coil groups and reaches the load of the out-hole measuring unit 3 through the voltage stabilizing and filtering circuit 212 and the charging switching circuit 213;
the charge switching circuit 213 includes: charging circuit 2131, lithium battery 2132, power supply battery switching circuit 2133, and booster circuit 2134. The voltage stabilizing filter circuit 212 is directly connected with the charging circuit 2131, and the charging circuit 2131 is connected with the lithium battery 2132 and charges the lithium battery 2132; the power supply battery switching circuit 2133 is connected to the lithium battery 2132 and the voltage stabilizing filter circuit 212, respectively, and then to the booster circuit 2134; during power supply, current is supplied to the out-of-hole measuring unit 3 through the voltage stabilizing filter circuit 212, the power battery switching circuit 2133 and the boost circuit 2134, and meanwhile, the lithium battery 2132 is charged through the voltage stabilizing filter circuit 212, the charging circuit 2131 and the lithium battery 2132; the current supplies power to the out-of-hole measuring unit 3 via the lithium battery 2132-power supply battery switching circuit 2133-booster circuit 2134 when power is off.
In this embodiment, please refer to fig. 1 and 2, the Lora wireless communication module 4 includes an out-hole Lora transmitting module 42 and an in-hole Lora receiving module 41, the out-hole Lora transmitting module 42 is powered by a booster circuit 2134, and test data of the out-hole measuring unit 3 is sent to the in-hole Lora receiving module 41 through the out-hole Lora transmitting module 42 and then uploaded to a ground host through the serial port communication module 116.
In this embodiment, referring to fig. 4, in order to make the wireless power transmission system reach the resonance state, the following formula needs to be satisfied:
the transmit side full bridge inverter circuit 114 outputs a voltage signal as follows,
in the method, in the process of the invention,
respectively representing the resistance of the transmitting coil 12, the resistance of the receiving coil 221, the resistance of the receiving coil 222, the load resistance of the receiving coil 221, the load resistance of the receiving coil 222, the inductance of the transmitting coil 12, the inductance of the receiving coil 221, the inductance of the receiving coil 222, the resonance capacitance of the transmitting coil 12, the resonance capacitance of the receiving coil 221, the resonance capacitance of the receiving coil 222, the output voltage of the full-bridge inverter circuit 114, the total current of the transmitting coil 12, the angular frequency of the system and the mutual inductance between the receiving coils 221, 222 and the transmitting coil 12;
fig. 5 shows the detection of the transmitting-side full-bridge inverter circuit 114 by the voltage acquisition circuit 115
In the formula, the formula is->
When (i.e.)>
The system enters a resonance state, and the transmitting end full-bridge inverter circuit 114 outputs voltage +>
Is the minimum, namely:
in this embodiment, referring to fig. 5 and 6, the implementation of frequency self-tuning based on the gradient descent frequency sweep optimizing algorithm includes the following steps:
s1, combining with FIG. 2, the PWM pulse is generatedThe generator 1123 sets an initial ω 0 The full-bridge inverter circuit 114 is driven to work, and meanwhile, the voltage acquisition circuit 115 detects the voltage of the output end of the current full-bridge inverter circuit 114 as U LC0 ；
S2, firstly, calculating omega 0 At an approximate slope, the MCU controller 112 detects ω based on the set resonant frequency angular frequency adjustment amount Δω 0 The output voltage of the full-bridge inverter circuit 114 at Δω as U LC1 ；
S3, detecting omega again 0 The output voltage of +Δω full bridge inverter circuit 114 is U LC2 The method comprises the steps of carrying out a first treatment on the surface of the Omega at this time 0 The approximate slope at (U) is set to LC2 -U LC1 ) Setting the scanning step length of the gradient descent sweep frequency optimizing algorithm to be S=eta (U) LC2 -U LC1 ) 2 delta omega, wherein eta represents the learning rate representing the speed of the scan iteration;
s4, based on the scanning step length, respectively obtaining a smaller working angular frequency omega 1 ＝ω 0 S, and a greater operating angular frequency omega 2 ＝ω 0 +S, the voltages at the output terminals of the corresponding full-bridge inverter circuit 114 are U LCS1 And U LCS2 The resolution of the comparator 1122 is set to Δu, and U is compared by the comparator 1122 LCS1 、U LC1 、U LCS2 The MCU controller 112 marks the minimum value thereof as the next U LC0 Temporary storage is carried out, the temporary storage is carried out,
s5, after multiple adjustment, when U LCS1 、U LC1 、U LCS2 When the maximum difference is smaller than the resolution deltau of the comparator 1122, the sweep frequency is stopped at this time, and finally the output voltage of the full-bridge inverter circuit 114 is minimized, so that the system reaches a resonance state, and the closed-loop control of the resonance state of the wireless power transmission system is realized.
The gradient descent frequency sweep optimization algorithm module 1121 controls the frequency output according to the result of the comparator 1122, and the PWM pulse generator 1123 generates PWM pulses according to the output frequency of the gradient descent frequency sweep optimization algorithm module 1121 to control the MOSFET Q in the full-bridge inverter circuit 114 1 -Q 4 As shown in fig. 3.
In this embodiment, referring to fig. 7, in the frequency self-tuning dual-receiver wireless power transmission and communication device for landslide monitoring, the distance between the stable receiving coil 221 and the receiving coil 222 in the dual-receiving coil set is fixed at 100mm, and as can be seen from the efficiency curves of the dual-receiving coil wireless power transmission system and the single-receiving coil wireless power transmission system in fig. 7, the dual-receiving coil wireless power transmission system has better transmission stability and efficiency than the single-receiving coil wireless power transmission system.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the terms first, second, third, etc. do not denote any order, but rather the terms first, second, third, etc. are used to interpret the terms as labels.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (3)
1. A frequency self-tuning dual-receiver wireless power transmission and communication device for landslide monitoring, comprising: the wireless power transmission system comprises a wireless power transmission transmitting end, a wireless power transmission receiving end and a Lora wireless communication module;
the wireless power transmission transmitting end and the wireless power transmission receiving end are in communication connection through the Lora wireless communication module;
the wireless power transmission transmitting end is used for inverting direct current transmitted by the armored cable and then transmitting the direct current to the wireless power transmission receiving end through magnetic resonance coupling, and comprises a transmitting coil and a transmitting end circuit board connected with the transmitting coil, wherein the transmitting coil is wound on the in-hole measuring unit and connected with the resonance capacitor and then connected with the transmitting end circuit board through an enameled wire;
the wireless power transmission receiving end is used for being coupled with wireless power transmission, conditioning electric energy of the wireless power transmission transmitting end and then supplying the conditioned electric energy to the out-hole measuring unit for use, and comprises a double receiving coil set and a receiving end circuit board connected with the double receiving coil set, wherein the double receiving coil set is wound on a sleeve, connected with a resonance capacitor and then connected with the receiving end circuit board;
the Lora wireless communication module comprises an in-hole Lora receiving module and an out-hole Lora transmitting module, and is used for wireless transparent transmission of in-hole and out-hole data and uploading to a ground host through the serial port communication module;
the transmitting-end circuit board comprises: the device comprises an in-hole unit direct-current power supply, an MCU controller, a serial port communication module, a full-bridge MOS driving circuit, a full-bridge inverter circuit and a voltage acquisition circuit;
the in-hole unit direct current power supply is respectively connected with the MCU controller, the full-bridge MOS driving circuit, the voltage acquisition circuit and the full-bridge inverter circuit and supplies power; the MCU controller is connected with the full-bridge MOS driving circuit, controls the full-bridge MOS driving circuit through the tuned high-frequency driving signal, outputs high-frequency current and drives the full-bridge inverter circuit connected with the full-bridge MOS driving circuit; the full-bridge inverter circuit is connected with the transmitting coil, the transmitting coil converts high-frequency current into electromagnetic energy and sends the electromagnetic energy to the wireless power transmission receiving end, and the serial port communication module is connected with the armored cable;
the MCU controller includes: the device comprises a gradient descent sweep algorithm module, a PWM pulse generator, a comparator and an AD converter;
the AD converter is connected with the voltage acquisition circuit and then connected with the comparator, the comparator is connected with the gradient descent frequency sweep algorithm module, and the gradient descent frequency sweep algorithm module is connected with the PWM pulse generator; the voltage acquisition circuit detects an output voltage signal of the full-bridge inverter circuit, the output voltage signal is transmitted to the comparator after passing through the AD converter, and minimum value optimization is carried out based on a gradient descent frequency sweep algorithm to obtain a resonant frequency; the PWM pulse generator is controlled to drive the full-bridge inverter circuit through the resonance frequency, so that the wireless power transmission system works in a resonance state, and closed-loop control of the resonance state of the wireless power transmission system is realized;
the minimum value optimizing is carried out based on the gradient descent frequency sweep algorithm to obtain the resonance frequency, and the method specifically comprises the following steps:
s1, the MCU controller sets initial output angular frequency omega 0 By the initial output angular frequency omega 0 The full-bridge inverter circuit is driven to work, and meanwhile the voltage acquisition circuit detects the voltage of the output end of the full-bridge inverter circuit as U LC0 ；
S2, calculating omega 0 The MCU controller detects omega according to the set resonant frequency angular frequency adjustment quantity delta omega at the approximate slope 0 -delta omega the full-bridge inverter circuit output voltage as U LC1 ；
S3, detecting omega 0 The output end voltage of the full-bridge inverter circuit at +delta omega is used as U LC2 The method comprises the steps of carrying out a first treatment on the surface of the Omega at this time 0 The approximate slope at (U) is set to LC2 -U LC1 ) Setting the scanning step length of the gradient descent sweep frequency optimizing algorithm to be S=eta (U) LC2 -U LC1 ) 2 delta omega, wherein eta represents the learning rate representing the speed of the scan iteration;
s4, scanning step length based on set gradient descent sweep frequency optimizing algorithm to obtain smaller working angle frequency omega respectively 1 ＝ω 0 S, and a greater operating angular frequency omega 2 ＝ω 0 +S, wherein the voltages at the output ends of the corresponding full-bridge inverter circuits are U respectively LCS1 And U LCS2 Setting the resolution as DeltaU by comparing U LCS1 、U LC1 、U LCS2 The MCU microcontroller marks the minimum value as the next U LC0 Temporary storage;
s5, returning to the step S1, resetting the initial output angular frequency, and adjusting for a plurality of times to obtain the final product LCS1 、U LC1 、U LCS2 And when the maximum difference is smaller than the resolution delta U, stopping scanning at the moment, and finally enabling the output voltage of the full-bridge inverter circuit to be minimum, so that the wireless power transmission system reaches a resonance state.
2. The frequency self-tuned dual-receiver wireless power transmission and communication device for landslide monitoring of claim 1 wherein said receiver circuit board comprises: the full-bridge rectifier circuit, the voltage stabilizing filter circuit and the charging switching circuit;
the dual receiving coils are connected with the full-bridge rectifying circuit, the full-bridge rectifying circuit is connected with the voltage stabilizing filter circuit, the voltage stabilizing filter circuit is connected with the charging switching circuit, and electric energy is transmitted to the full-bridge rectifying circuit through coupling between the transmitting coils and the dual receiving coil groups and reaches the measuring unit outside the hole through the voltage stabilizing filter circuit and the charging switching circuit.
3. The frequency self-tuned dual-receiver wireless power transmission and communication device for landslide monitoring of claim 2 wherein said charge switching circuit comprises a charging circuit, a lithium battery, a power supply battery switching circuit and a boost circuit;
the voltage stabilizing filter circuit is connected with the charging circuit, and the charging circuit is connected with the lithium battery and charges the lithium battery; the power battery switching circuit is connected with the lithium battery and the voltage stabilizing filter circuit respectively and then connected with the boost circuit; when in power supply, current sequentially passes through the voltage stabilizing filter circuit, the power battery switching circuit and the boost circuit to supply power to the out-hole measuring unit, and simultaneously passes through the voltage stabilizing filter circuit and the charging circuit to charge the lithium battery; when the charging circuit is powered off, current passes through the lithium battery, the power battery switching circuit and the boost circuit to supply power to the out-hole measuring unit.
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