CN207251274U - A kind of wireless charging magnetic inductive sensing node apparatus and system - Google Patents
A kind of wireless charging magnetic inductive sensing node apparatus and system Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 7
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Abstract
It the utility model is related to a kind of wireless charging magnetic inductive sensing node apparatus and system, based on including sensor, microprocessor, signal sending circuit, signal receiving circuit, switching switch, coupling coil, current rectifying and wave filtering circuit, regulator circuit, charge management circuit, the sensing node device of charge power supply and numerical control switch designs, build systemic application framework, in practical application, it is mainly used in underground environment, when sensing node device is buried underground, charging unit carries out wireless charging by way of magnetic induction coupled resonance to sensing node device, efficiently solve the powerup issue of in-ground sensor node, extend the life cycle of wireless sensor network.
Description
Technical field
A kind of wireless charging magnetic inductive sensing node apparatus and system is the utility model is related to, belongs to wireless sensor network
Network technical field.
Background technology
Wireless sensor network combines sensor technology, embedding assembly technology, wireless network communication technique and divides
Cloth information processing technology etc., collaboratively can in real time be monitored, perceived and gathered by all kinds of integrated microsensors and is each
The information of kind environment or monitoring object, is with a wide range of applications in fields such as military affairs, environment, equipment condition monitorings.
Wireless sensor network interior joint number is more, distributed areas are wide, local environment is complicated, and power supply is in whole wireless sensing
It is extremely important in device Design of Network System.Wireless sensor network that is most common at present and being easiest to realization
Node power supply mode is mainly battery powered.The restricted lifetime of common batteries, the service life of general battery determine sensor node
Service life, need periodic replacement battery to extend the service life of sensor node, so not only heavy workload, cost
Height, wastes also serious and electric for the large area wireless sensor network in the adverse circumstances such as underground, mine, oil field
The replacement in pond is relatively difficult.Except through battery a kind of new supplier of electricity is have also appeared to wireless sensor node power supply in addition
Formula, i.e., capture energy from node surrounding environment, and is translated into the required electric energy of wireless sensor node.Existing research
Show, solar energy present in surrounding environment, wind energy, vibrational energy and electromagnetic energy etc. can be converted to electric energy and are applied to nothing
Line sensor network.But these energy-provision way are only applicable to some special scenes, and the finite energy that can be provided.Cause
This, wireless sensor network node power supply is a problem to be solved.
Utility model content
Technical problem to be solved in the utility model is to provide one kind and is designed using brand new, efficiently can solve ground
The wireless charging magnetic inductive sensing node device of embedded sensing node powerup issue down.
In order to solve the above-mentioned technical problem the utility model uses following technical scheme：The utility model devises a kind of nothing
The induction sensing node device of micro USB, including charging unit and sensing node device, wherein, sensing node device is arranged on
The position of the following predetermined depth of earth's surface, is used for realization the collection of specified type data；Sensing node device includes sensor, Wei Chu
Manage device, signal sending circuit, signal receiving circuit, switching switch, coupling coil, current rectifying and wave filtering circuit, regulator circuit, charging valve
Manage circuit, charge power supply and numerical control switch；Wherein, sensor is used for realization the collection of specified type data, microprocessor difference
It is connected with the output terminal of sensor, charge management circuit, charge power supply, the input terminal of signal sending circuit, signal receiving circuit
Connect, microprocessor realizes the monitoring of specified type power data for charge power supply；Output terminal, the signal of signal sending circuit connect
Receive the input terminal of circuit by switching switch, select one and be connected with first coil access point；The output terminal of current rectifying and wave filtering circuit with
The input terminal of regulator circuit is connected, and the output terminal of regulator circuit is connected with the input terminal of charge management circuit, Charge Management
The output terminal of circuit is connected with the input terminal of charge power supply, and the input terminal of current rectifying and wave filtering circuit is as the second coil access point；
First coil access point, the second coil access point by numerical control switch, select one and be connected with coupling coil, and first coil connects
The both ends of coupling coil are corresponded in access point, respectively parallel resonance capacitance；Coupling coil, which is horizontal, to be arranged on below earth's surface in advance
If the position of depth；Charging unit includes the charging equipment and transmitting coil being connected with each other, the knot of transmitting coil in charging unit
Structure is identical with the structure of coupling coil in sensing node device；Charging unit is movably set in be filled for sensing node device
Electricity, wherein, transmitting coil is positioned horizontally in earth's surface, and transmitting coil position and coupling coil in sensing node device in charging unit
Position in the vertical direction corresponds to each other.
A kind of optimal technical scheme as the utility model：Signal condition electricity is further included in the sensing node device
Road, the sensor are connected by signal conditioning circuit with microprocessor.
A kind of optimal technical scheme as the utility model：Further included in the sensing node device and the microprocessor
The clock chip that device is connected.
A kind of optimal technical scheme as the utility model：Further included in the sensing node device and the microprocessor
The memory that device is connected.
A kind of optimal technical scheme as the utility model：The signal sending circuit is by its input terminal to its output terminal
Direction, successively including signal modulation module, power amplifier module and impedance matching module；The signal receiving circuit is inputted by it
End exports extreme direction to it, includes accept filter module, signal amplification module, signal demodulation module successively.
And the utility model also technical problems to be solved are filled based on above-mentioned wireless charging magnetic inductive sensing node
Put, there is provided a kind of system for the wireless charging magnetic inductive sensing node device that can realize efficient wireless communication function.
In order to solve the above-mentioned technical problem the utility model uses following technical scheme：The utility model devises a kind of nothing
The system of the induction sensing node device of micro USB, including at least two sensing node devices, each sensing node device point
The position of earth's surface predetermined depth same as below is not arranged at, and the spacing in neighboring sensor node apparatus between coupling coil is pre-
If distance.
A kind of wireless charging magnetic inductive sensing node apparatus and system described in the utility model, using above technical scheme
Compared with prior art, there is following technique effect：Wireless charging magnetic inductive sensing node device designed by the utility model
And system, wireless charging is carried out to underground wireless sensor node by the way of magnetic induction coupled resonance, can not only be realized
Several meters of wireless charging distance, and can be to pass through a variety of nonmetallic barriers, and larger work(is transmitted in a certain distance
Rate, efficiently solves the powerup issue of the particular surroundings lower sensor nodes such as underground environment monitoring, colliery, oilfield safety monitoring,
The life cycle of wireless sensor network node is extended, so as to extend the life cycle of whole wireless sensor network；Wirelessly
Sensor node is received and sent messages replaces electromagnetic communication mode, transmission circuit and charging circuit using magnetic induction communication
A coupling coil is shared as antenna, the shortcomings that traditional low-frequency electromagnetic communication antenna size is big is solved, is easily installed, more
Suitable for the inferior complex environment in ground；Rechargeable lithium battary is selected to power to node, lithium battery is small, capacity is big, discharge and recharge
Performance is good, and service life is long, environmentally protective, has been specifically designed battery management circuit for the characteristics of charging and discharging lithium battery, and lead to
Cross microprocessor（MCU）In real time monitoring battery status, can effectively prevent over-charging of battery, cross put, temperature it is excessive, electric current it is excessive wait danger
The occurrence of dangerous, ensure the work safety of node.
Brief description of the drawings
Fig. 1 is the functional schematic of wireless charging magnetic inductive sensing node device designed by the utility model；
Fig. 2 is that signal transmitting and receiving function is illustrated in wireless charging magnetic inductive sensing node device designed by the utility model
Figure；
Fig. 3 is that wireless charging function is illustrated in wireless charging magnetic inductive sensing node device designed by the utility model
Figure；
Fig. 4 is the physical circuit of wireless charging in wireless charging magnetic inductive sensing node device designed by the utility model
Schematic diagram；
Fig. 5 is the magnetic induction coupled resonance principle schematic involved by the utility model；
Fig. 6 is the wireless charging application signal of wireless charging magnetic inductive sensing node device designed by the utility model
Figure；
Fig. 7 is signal transmission between wireless charging magnetic inductive sensing node apparatus system interior joint designed by the utility model
Application schematic diagram.
Embodiment
Wireless power technology is always the hot issue of human research, mainly in a non-contact manner to power supply unit into
Row electric energy transmits.The research of wireless charging was found afterwards just to start early in the law of electromagnetic induction in 1840, still, traditional
Wireless charging technology there are transmission range it is excessively near, the problems such as barrier can not be passed through, therefore be not used widely.Nearly 2 years,
Magnetic induction coupled resonance formula wireless energy transmission technology develops rapidly as a kind of emerging wireless energy transmission technology, and
Cause huge repercussion in wireless energy transfer field.The technology can not only make wireless energy transfer number meter, but also can wear
A variety of nonmetallic barriers are crossed, and relatively high power is transmitted in a certain distance.As a kind of new wireless charging mode,
Magnetic induction coupled resonance formula wireless charging has wide application field, while is also opened up for wireless sensor network node energy supply
New way.
Specific embodiment of the present utility model is described in further detail with reference to Figure of description.
As shown in Figure 1, the utility model devises a kind of wireless charging magnetic inductive sensing node device, practical application
In, charging unit and sensing node device are specifically included, wherein, sensing node device is arranged on the position of the following predetermined depth of earth's surface
Put, be used for realization the collection of specified type data；Sensing node device include sensor, signal conditioning circuit, microprocessor, when
Clock chip, signal sending circuit, signal receiving circuit, switching switch, memory, coupling coil, current rectifying and wave filtering circuit, voltage stabilizing electricity
Road, charge management circuit, charge power supply and numerical control switch, in practical application, for charge power supply, design uses lithium-ion electric
Pond, for memory, design uses flash storage；Wherein, sensor is used for realization the collection of specified type data, micro- place
Manage device respectively with signal conditioning circuit, clock chip, charge management circuit, charge power supply, memory, signal sending circuit it is defeated
Enter end, the output terminal of signal receiving circuit is connected, sensor is connected by signal conditioning circuit with microprocessor, microprocessor
Device realizes the monitoring of specified type power data for charge power supply；As shown in Fig. 2, the output terminal of signal sending circuit, signal
The input terminal of receiving circuit by switching switch, select one and be connected with first coil access point, wherein, signal sending circuit is by it
Input terminal is to its output extreme direction, successively including signal modulation module, power amplifier module and impedance matching module；Signal receives
Circuit exports extreme direction by its input terminal to it, includes accept filter module, signal amplification module, signal demodulation module successively；
As shown in figure 3, the output terminal of current rectifying and wave filtering circuit is connected with the input terminal of regulator circuit, the output terminal of regulator circuit and charging
The input terminal of management circuit is connected, and the output terminal of charge management circuit is connected with the input terminal of charge power supply, rectifying and wave-filtering
The input terminal of circuit is as the second coil access point；First coil access point, the second coil access point by numerical control switch, select one
It is connected with coupling coil, and the both ends of coupling coil is corresponded on first coil access point, difference parallel resonance capacitance C1,
C2, joins the application of resonant capacitance C1, C2 here, can be directed to wireless charging magnetic inductive sensing node device and perform signal transmitting and receiving
Process, effectively improves information transmit-receive efficiency；Coupling coil, which is horizontal, is arranged on the position of the following predetermined depth of earth's surface；Charging
Device includes the charging equipment and transmitting coil being connected with each other, in charging unit the structure of transmitting coil with sensing node device
The structure of coupling coil is identical；Charging unit is movably set in charge for sensing node device, wherein, sent out in charging unit
Ray circle is positioned horizontally in earth's surface, and transmitting coil position with coupling coil position in the vertical direction in sensing node device each other
It is corresponding, and further set based on above-mentioned specific designed wireless charging magnetic inductive sensing node device, the utility model
Wireless charging magnetic inductive sensing node apparatus system, including at least two sensing node devices, each sensing node dress are counted
Put the position for being respectively arranged at earth's surface predetermined depth same as below, and the spacing in neighboring sensor node apparatus between coupling coil
For pre-determined distance.
In practical application, as shown in Fig. 2, sensing node device is with microprocessor chip（MCU）For core, sensor collection
Information microprocessor is accessed by signal conditioning circuit, microprocessor serial ports connection signal transmitting and receiving power transmission road, when sending information,
Serial ports exports signal by accessing coupling coil, letter after signal modulation, power amplification and impedance matching in the form of sine wave
Number sent by the magnetic field of alternation, during receive information, be in coupling coil induced field energy in alternating magnetic field by its
Be converted to electric signal, signal is filtered, passes through serial ports input microprocessor after amplification and demodulator circuit, reads information.
And based on the wireless charging function schematic diagram in the sensing node device of wireless charging magnetic inductive shown in Fig. 3, sheet
Utility model is further as shown in figure 4, devise specific wireless charging function circuit diagram, then based on shown in Fig. 3, Fig. 4, institute
Charging circuit is stated by sequentially connected coupling coil, current rectifying and wave filtering circuit, regulator circuit, charge management circuit and lithium ion battery
Composition；When sensing node device charges, charging unit converts electrical energy into magnetic energy by transmitting coil, in a manner of alternating magnetic field
Emit, sensing node device is by coupling coil induced field energy and is converted into ac signal, and alternating current is through full-bridge
Rectifying and wave-filtering exports direct current, then direct current accesses Charge Management electricity by the stable 5V voltages of DC/DC regulator circuits output
Lithium ion battery is charged on road, selects constant current/constant voltage lithium battery linear-charging management core TP4057 design charging valves here
Circuit is managed, TP4057 includes two state instruction ends, charged state indication end CHRG and charging complete indication end STDBY, charges
When CHRG ends output low level, represent that charging is carrying out, when cell voltage is less than 2.9V, preliminary filling carried out to battery with low current
Electricity, when cell voltage is more than 2.9V, charges battery using constant current mode, charging current is by between PROG pins and GND
Resistance R determines that, when cell voltage is close to 4.2V voltages, charging current is gradually reduced, into constant-voltage charge pattern, when charging electricity
When stream is reduced to charging end threshold value（It is the 10% of constant-current charge electric current to terminate threshold value）, charge cycle terminates, and the output of CHRG ends is high
Resistance state, STDBY ends output low potential.During discharge and recharge, microprocessor detects charged state by CHRG and STDBY ends,
And the parameters such as cell voltage, electric current, temperature are monitored in real time, prevent from being likely to occur in battery charge and discharge process overcharges, and crosses and puts, is warm
Spend height, the excessive generation for waiting dangerous situation of electric current.
Magnetic induction coupled resonance principle schematic involved by the utility model as shown in Figure 5, magnetic induction coupled resonance skill
Art requires transmitting terminal and the coupling coil of receiving terminal configuration identical resonance frequency, and transmitting-receiving two-end keeps suitable distance, sends end line
Enclose in L2 and load with after resonant frequency identical frequency alternating current, the magnetic field of alternation, receiving coil L2 meetings will be produced around it
Resonance is produced, induces the alternating current of coupling, energy is transferred to receiving terminal from transmitting terminal in the form of induced field, realizes energy
Amount or information are wirelessly transferred.Such as figure, L1, L2 are respectively dispatch coil self-induction, and C1, C2 are resonant capacitance, and C1 and L1, which is formed, to be sent out
End shunt-resonant circuit is penetrated, C2 and L2 forms receiving terminal shunt-resonant circuit, and Z1, Z2 are respectively launching circuit with receiving circuit
Equiva lent impedance, RL are the equivalent resistance of load, and two coupling coil spacing are d, are established and contacted by mutual inductance M.
The wireless charging application signal of the utility model design wireless charging magnetic inductive sensing node device as shown in Figure 6
Figure, when the wireless sensor node designed by the utility model is operated in underground environment, charging unit can using transmitting coil
In a manner of by magnetic induction coupled resonance, directly to be embedded in underground node carry out wireless charging, adjustment transmission power and
Coupling angle between coil, wireless charging distance is up to several meters, so that solve the problems, such as the secondary energy supply of ground lower node, it is actual to answer
In, specifically comprise the following steps：
The charging unit is arranged at earth's surface, the position corresponding to sensing node device to be charged by step A1., and is filled
Transmitting coil position corresponds to each other with coupling coil position in the vertical direction in sensing node device in electric installation.
Step A2. controls the numerical control switch, connects the path between the second coil access point and coupling loop circle.
Step A3. controls charging equipment work in charging unit to power for transmitting coil, and transmitting coil, which is powered, produces alternation
Magnetic field.
Step A4. is based on alternating magnetic field caused by transmitting coil, on the coupling coil in sensing node device to be charged
Produce alternating current, the alternating current rectified filter circuit, regulator circuit, charge management circuit successively are charge power supply into
Row charging, that is, be embodied as sensing node device to be charged and charge.
Signal passes between the utility model design wireless charging magnetic inductive sensing node apparatus system interior joint as shown in Figure 7
Pass application schematic diagram, when the wireless sensor node designed by the utility model be buried underground or the structure such as mine country rock in
When, received and sent messages between node, adjusted between transmission power and coil by magnetic induction communication using coupling coil
Coupling angle, tens of meters of communication distance can be realized using less coil, so as to build wireless sensor network, specifically
Data transferring method between neighboring sensor node apparatus, including data transmission method for uplink and data method of reseptance, wherein, data hair
Delivery method includes the following steps：
Step B1. controls the numerical control switch, connects the path between first coil access point and coupling loop circle, and control
Switching switch processed, the path between communications signals transtation mission circuit output terminal and first coil access point.
Microprocessor pin described in step B2. through signal sending circuit, sends out data to be sent with sine wave signal
Send to coupling coil.
It is outside to produce corresponding alternating magnetic field signal according to received sine wave signal for step B3. coupling coils
It is transmitted, realizes data sending.
Data receiver method includes the following steps：
Sensing node device adjacent with the sensing node device for performing data sending step C1., is saved as sensing is received
Point device, for sensing node device is received, controls numerical control switch, connects logical between first coil access point and coupling loop circle
Road, and switching switch is controlled, the path between communications signals receiving circuit input terminal and first coil access point.
Alternating magnetic field signal caused by coupling coil in sensing node devices of the step C2. based on execution data sending,
Receive and produce corresponding electric signal on the coupling coil in sensing node device.
Step C3. receives the microprocessor in sensing node device, is received through signal receiving circuit on coupling coil
Caused electric signal, realizes data receiver.
Wireless charging magnetic inductive sensing node apparatus and system and methods for using them designed by above-mentioned technical proposal, using magnetic
Inductively the mode of resonance carries out wireless charging to underground wireless sensor node, can not only realize several meters of wireless charging
Distance, and can be to pass through a variety of nonmetallic barriers, and relatively high power is transmitted in a certain distance, efficiently solve ground
The powerup issue of the particular surroundings lower sensor nodes such as lower environmental monitoring, colliery, oilfield safety monitoring, extends wireless senser
The life cycle of network node, so as to extend the life cycle of whole wireless sensor network；Wireless sensor node transmitting-receiving letter
Breath replaces electromagnetic communication mode using magnetic induction communication, and transmission circuit shares a coupling coil with charging circuit
As antenna, solve the shortcomings that traditional low-frequency electromagnetic communication antenna size is big, be easily installed, be more suitable for inferior complexity
Environment；Rechargeable lithium battary is selected to power to node, lithium battery is small, capacity is big, charge-discharge performance is good, service life
It is long, environmentally protective, battery management circuit is specifically designed for the characteristics of charging and discharging lithium battery, and pass through microprocessor（MCU）
In real time monitoring battery status, can effectively prevent over-charging of battery, cross put, temperature it is excessive, electric current it is excessive wait dangerous situation generation, protect
Hinder the work safety of node.
The embodiment of the utility model is explained in detail above in conjunction with attached drawing, but the utility model is not limited to
The above embodiment, within the knowledge of a person skilled in the art, can also not depart from the utility model
Various variations are made on the premise of objective.
Claims (6)
- A kind of 1. wireless charging magnetic inductive sensing node device, it is characterised in that：Including charging unit and sensing node device, Wherein, sensing node device is arranged on the position of the following predetermined depth of earth's surface, is used for realization the collection of specified type data；Sensing Node apparatus includes sensor, microprocessor, signal sending circuit, signal receiving circuit, switching switch, coupling coil, rectification Filter circuit, regulator circuit, charge management circuit, charge power supply and numerical control switch；Wherein, sensor is used for realization specified type The collection of data, microprocessor respectively with sensor, charge management circuit, charge power supply, signal sending circuit input terminal, letter The output terminal of number receiving circuit is connected, and microprocessor realizes the monitoring of specified type power data for charge power supply；Signal The output terminal of transtation mission circuit, the input terminal of signal receiving circuit by switching switch, select one and be connected with first coil access point； The output terminal of current rectifying and wave filtering circuit is connected with the input terminal of regulator circuit, the output terminal of regulator circuit and charge management circuit Input terminal is connected, and the output terminal of charge management circuit is connected with the input terminal of charge power supply, the input of current rectifying and wave filtering circuit End is used as the second coil access point；First coil access point, the second coil access point by numerical control switch, select one and coupling coil It is connected, and the both ends of coupling coil is corresponded on first coil access point, respectively parallel resonance capacitance；Coupling coil is in level State is arranged on the position of the following predetermined depth of earth's surface；Charging unit includes the charging equipment and transmitting coil being connected with each other, and fills The structure of transmitting coil is identical with the structure of coupling coil in sensing node device in electric installation；Charging unit be movably set in for Sensing node device charges, wherein, transmitting coil is positioned horizontally in earth's surface, and transmitting coil position and sensing in charging unit Coupling coil position in the vertical direction corresponds to each other in node apparatus.
- A kind of 2. wireless charging magnetic inductive sensing node device according to claim 1, it is characterised in that：The sensing section Signal conditioning circuit is further included in point device, the sensor is connected by signal conditioning circuit with microprocessor.
- A kind of 3. wireless charging magnetic inductive sensing node device according to claim 1, it is characterised in that：The sensing section The clock chip being connected with the microprocessor is further included in point device.
- A kind of 4. wireless charging magnetic inductive sensing node device according to claim 1, it is characterised in that：The sensing section The memory being connected with the microprocessor is further included in point device.
- A kind of 5. wireless charging magnetic inductive sensing node device according to claim 1, it is characterised in that：The signal hair Power transmission route its input terminal to its output extreme direction, successively including signal modulation module, power amplifier module and impedance matching mould Block；The signal receiving circuit exports extreme direction by its input terminal to it, includes accept filter module, signal amplification mould successively Block, signal demodulation module.
- It is 6. a kind of based on a kind of system of wireless charging magnetic inductive sensing node device described in claim 1, it is characterised in that： Including at least two sensing node devices, each sensing node device is respectively arranged at the position of earth's surface predetermined depth same as below Put, and the spacing in neighboring sensor node apparatus between coupling coil is pre-determined distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201721246005.8U CN207251274U (en) | 2017-09-27 | 2017-09-27 | A kind of wireless charging magnetic inductive sensing node apparatus and system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721246005.8U CN207251274U (en) | 2017-09-27 | 2017-09-27 | A kind of wireless charging magnetic inductive sensing node apparatus and system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107834674A (en) * | 2017-09-27 | 2018-03-23 | 中国矿业大学 | A kind of wireless charging magnetic inductive sensing node apparatus and system and methods for using them |
| WO2019218162A1 (en) * | 2018-05-15 | 2019-11-21 | Oppo广东移动通信有限公司 | Device to be charged and wireless charging method and system |
| US11355963B2 (en) | 2017-04-07 | 2022-06-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to-be-charged, wireless charging apparatus, and wireless charging method |
-
2017
- 2017-09-27 CN CN201721246005.8U patent/CN207251274U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11355963B2 (en) | 2017-04-07 | 2022-06-07 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to-be-charged, wireless charging apparatus, and wireless charging method |
| CN107834674A (en) * | 2017-09-27 | 2018-03-23 | 中国矿业大学 | A kind of wireless charging magnetic inductive sensing node apparatus and system and methods for using them |
| CN107834674B (en) * | 2017-09-27 | 2024-08-06 | 中国矿业大学 | Wireless charging magnetic induction type sensing node device, system and application method |
| WO2019218162A1 (en) * | 2018-05-15 | 2019-11-21 | Oppo广东移动通信有限公司 | Device to be charged and wireless charging method and system |
| US11387686B2 (en) | 2018-05-15 | 2022-07-12 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Device to be charged, wireless charging method and system |
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