CN107689691A - A kind of magnetic resonance type wireless charging sensor network nodes design method - Google Patents
A kind of magnetic resonance type wireless charging sensor network nodes design method Download PDFInfo
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Classifications
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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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- H02J7/025—
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/06—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
-
- 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
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- H04B5/48—
Abstract
The invention discloses a kind of magnetic resonance type wireless charging sensor network nodes design method, node includes magnetic resonance type wireless charging device and wireless sensor network framework, the magnetic resonance type wireless charging device is divided into energy transmitter module and energy acceptance module, and the energy transmitter module includes 24V DC power suppliers, Voltage stabilizing module, metal-oxide-semiconductor drive module and E class inverter circuits；The energy acceptance module, by receiving coil direct current electricity output is obtained after magnetic resonance obtains energy through E class rectification circuits, charged to acquisition node, the energy acceptance module includes E class rectification circuits, electrically connected between E classes inverter circuit and E the class rectification circuit by transmitting coil and receiving coil, the transmitting coil and receiving coil transmit electric energy in a manner of magnetic resonance.The present invention by circuit control and the collection of sensor information, transmit and be shown in one, avoid excessively complicated circuit, build succinct effective device.
Description
Technical field
The present invention relates to the technical field of wireless sensor network, is sensed more particularly, to a kind of magnetic resonance type wireless charging
Device network node design method.
Background technology
Wireless energy transmission technology can chase after north early 20th century earliest, be described as the engineering of " father of wireless energy transfer "
Energy transfer is realized under the contemplated long-distance large-range electric field with experiment of teacher Ni Gula teslas, but due to energy transfer efficiency
Not good enough and experimental facilities limitation does not have experiment and come out, and his descendant that is envisioned for studies intensively wireless energy transmission technology and provided
Huge conception space.In existing domestic and foreign literature, the mode of wireless energy transfer can be by different working mechanism point
For induction, field coupling formula, microwave radiation formula.And these modes are usually associated with the conversion of energy, it is usually expressed as
The electromagnetic field of an alternation is produced in a manner of electromagnetic wave, then energy is obtained from the electromagnetic field of this alternation.Energy transmits root
Distance according to alternating electromagnetic field apart from field source, it can mark off using near field transmission and using far field transmission, wherein induction
And magnetic resonance type is to utilize near field transmission, microwave radiation then utilizes far field transmission.
Induction wireless energy transmission technology has been a more ripe technology in the world at present, should
Technology mainly pass through transmitting coil in have electric current by, and receiving coil pass through electromagnetic induction form obtain energy.Electromagnetism sense
Answer wireless charging technology to be made very small coil, closely high conversion efficiency, be particularly suitable for portable product exploitation, but transmit
Apart from it is short, can not realize it is one-to-many charging, charge coil want Accurate align, heating it is serious the shortcomings of.
Field coupling formula wireless energy transmission technology is made up of the two poles of the earth metal plate electric capacity, is divided into transmitting pole plate and receiving pole
Plate, pass through the coupling transmission energy of alternating electric field.The technology is due to using capacitor plate, in two-plate transmitting procedure
Need not be accurate parallel, position is more free, and capacitor plate is relatively thin, and its temperature rise is smaller, overcomes induction wireless energy and passes
Some defeated defects, but due to producing displacement current on pole plate is received, influence health.
Microwave radiation formula wireless energy transmission technology essence is to launch specific direction and the electricity of intensity using emitter
Magnetic wave, reception device use RECTIFYING ANTENNA technical limit spacing energy.But efficiency is still too low at present, and combine
Section is more, and the technology of fusion is complex, and microwave radiation formula wireless energy transmission technology is at present also in developing stage.
Human body is safe from harm so how to design the nearly electric field that a kind of transmission technology utilizes, unlike microwave radiation
The possible do harm to huamn body of this strong electromagnetic wave of formula, less easily endangered as electric current occurs in field coupling formula to artificial into getting an electric shock
Evil, it is the direction of those skilled in the art's research.
The content of the invention
The shortcomings that it is a primary object of the present invention to overcome prior art and deficiency, there is provided a kind of magnetic resonance type wireless charging
Sensor network nodes design method, using E classes inverter circuit and E class equivalent circuits build energy transmitter module and energy connects
Module is received, the control to inverter circuit and the function of wireless sensor network node are completed followed by acp chip CC2530.
In order to achieve the above object, the present invention uses following technical scheme：
A kind of magnetic resonance type wireless charging sensor network nodes design method of the present invention, it is wireless that node includes magnetic resonance type
Charging device and wireless sensor network framework, the magnetic resonance type wireless charging device is divided into energy transmitter module and energy connects
Module is received, the energy transmitter module includes 24V DC power suppliers, Voltage stabilizing module, metal-oxide-semiconductor drive module and E classes inversion electricity
Road；The energy acceptance module, direct current electricity output is obtained through E class rectification circuits after magnetic resonance obtains energy by receiving coil,
Charged to acquisition node, the energy acceptance module includes E class rectification circuits, the 24V DC power suppliers and Voltage stabilizing module and E
Class inverter circuit connects, and the Voltage stabilizing module, metal-oxide-semiconductor drive module E class inverter circuits are linked in sequence, the E classes inversion electricity
Electrically connected between road and E class rectification circuits by transmitting coil and receiving coil, the transmitting coil and receiving coil are total to magnetic
The mode shaken transmits electric energy；During work, the adapter that 220V industrial-frequency alternating currents pass through in 24V DC power suppliers is converted into direct current
Electricity, then the E class inverter circuits by being controlled by telegon, produce alternating current, receiving coil passes through magnetic resonance on transmitting coil
Mode obtain energy and give acquisition node power supply by E classes rectification circuit again, 24V direct currents are converted into 5V direct currents by Voltage stabilizing module
Supply electricity to HMI screen module and the power supply of metal-oxide-semiconductor drive module；And wireless sensor network is divided into telegon and acquisition node, both
ZigBee wireless communication modules are used, telegon is used to control metal-oxide-semiconductor drive module, receives the information of acquisition node collection simultaneously
Shown on serial ports HMI screen, acquisition node is used to pass on node collection information to telegon.
As preferable technical scheme, the transmitting coil and receiving coil use vertical spin type coil.
As preferable technical scheme, the energy transmitter module first passes around AC/DC adapters by power-frequency voltage 220V
Alternating current is converted to 24V direct currents, is powered through self-lock switch, then to circuit；When self-lock switch is opened, Voltage stabilizing module is by 24V
Direct current is converted to 5V direct currents, and the explanation circuit that brightens of the lamp on Voltage stabilizing module is in running order, and gives metal-oxide-semiconductor drive module
Powered with HMI screen；And square wave caused by telegon is transferred to the chip of metal-oxide-semiconductor drive module, metal-oxide-semiconductor drive module is by signal
Amplification becomes the switching signal of N-channel MOS pipe needs, and the break-make of metal-oxide-semiconductor causes E classes inverter circuit that 24V direct currents are changed into friendship
Stream electricity, receiving coil is given the energy to by transmitting coil.
As preferable technical scheme, the 24V dc sources power supply uses 24V adapters, and the 24V adapters are selected
2410 models；The Voltage stabilizing module uses LM2596 Voltage stabilizing modules；
Telegon is to have selected a CC2530 module, and the module carries out networking with acquisition node, passes through point-to-point shape
Formula is received and sent messages.
As preferable technical scheme, the E classes inverter circuit includes：MOSFET, dc source VCC, choke induction L1、
Resonant inductance L2, electric capacity C1, electric capacity C2With resistance RL, dc source VCCPowered for whole E classes inverter circuit, choke induction L1If
Put in dc source VCCBetween MOSFET, MOSFET again with electric capacity C1In parallel, the resonant inductance L with resistance RL2With electric capacity C2, and
Connection；L1For suppressing the ripple between dc source, therefore sufficiently large choke induction is selected, supply stable electric current, L2It is humorous to connect
Shake inductance and C2A pair of LC resonant networks are formed, are the key points that can circuit occur resonance, while the resonant network is also simultaneous
There is filter function, using the energy storage characteristic of electric capacity and inductance, electric energy is changed mutually with magnetic energy, MOSFET will by feedback mechanism
The signal amplification gradually to decay is gone back, C1It is the equivalent capacity for simulating MOSFET, and MOSFET has been generally integrated fly-wheel diode.
As preferable technical scheme, the course of work of the E classes inverter circuit is as follows：
When MOSFET is off state, MOSFET no currents are by the way that now electric current transfers to flow to MOSFET parallel connections
C1Equivalent capacity, C1Start to charge up, both end voltage is gradually increased to peaking by zero, meets I1=IC+I2；Opened after electric capacity is fully charged
Begin to discharge, i.e. ICInversely increase, load current starts gradually to increase, and now meets I2=I1+IC, voltage in electric capacity discharge process
Gradually decrease, when being reduced to zero, MOSFET starts transition status, and the diode of MOSFET reverse parallel connections plays afterflow effect；
When MOSFET pipes are on situation, the clamping action of diode causes MOSFET drain-source voltage across poles always
No-voltage is maintained, switching tube approximation regards no-voltage conducting, electric current I as2Gradually decreased by the direction of script, what switching tube passed through
Electric current does not stop to increase, until switching tube current IS=I1；As electric current I2When starting zero passage and inversely increase, simply meet
IS=I1+I2, reach a certain moment I2Maximum is increased to, i.e. switching tube bears maximum current；Electric current I2Start gradually landing, IS
Also begin to be gradually reduced until managing equal to zero, MOSFET and start transition status；
During switch OFF, C1、L2、C2、RLForm resonant tank, electric capacity C1First charge and discharge again, L1Release energy and serve
The effect of resonant condition is maintained, switchs and is turned on when voltage is zero, realize ZVS, electric current I2Experienced start from scratch it is positive by
It is cumulative it is big be gradually decrease to again zero process；
During switch conduction, L2、C2、RLResonant tank is formed, MOSFET drain-sources voltage across poles is protected always in this half period
It is zero to hold, electric current I2It experienced to start from scratch and reversely gradually increase the process for being gradually decrease to zero again.
As preferable technical scheme, the metal-oxide-semiconductor drive module selects two-way mos pipe driving chip UCC27425, supplies
Piezoelectric voltage is 4V to 15V, and maximum 4A driving force, TTL/CMOS is compatible to be inputted, built-in two enabled pin ENBA and ENBB.
As preferable technical scheme, the E classes rectification circuit includes electric capacity C1, fast recovery diode D1, an electricity
Hold C2, inductance L1, electric capacity C3 and inductance RL, L1 and C3 composition be filter circuit i.e. conventional L-shaped low pass filter,
AC power simulation receiving coil sensing produces alternating current, and C1 serves compensating electric capacity, serves resonance and carries efficient work
With when D1, which ends, to be turned off, circuit provides direct current to the voltage in alternating current positive axis to load RL after filtering, when D1 is turned on
When, voltage alternating current born on semiaxis is turned in positive axis, RL still or the constant voltage in direction, and C2 be D1 etc.
Electric capacity is imitated, the value of this electric capacity directly affects whether D1 is operated in Sofe Switch state.
As preferable technical scheme, the ZigBee wireless communication modules select CC2530 ZigBee communication modules,
The module is made up of CC2530 chips and peripheral circuit, and peripheral circuit includes RF radio frequency parts, 32.768kHz external crystal-controlled oscillations electricity
Road, 32.768kHz, clock source, decoupling circuit and lithium battery charging management circuit；The RF radio frequency parts by electric capacity C21,
C23 and inductance L3, L4 optimize unbalanced antenna, and meet the requirement of 50 ohm of antenna match impedance；Outside 32.768kHz
Crystal oscillating circuit is made up of electric capacity C24, C25 and oscillator Y2, and a precise and stable clock signal is provided for system；Outside 32MHz
Portion's crystal oscillating circuit is made up of electric capacity C26, C27 and oscillator Y1, and clock source is provided for RF transceivers or for main system；Decoupling
Electric routing capacitance C28 provides decoupling effect when being run for 1.8V voltage-stablizers；Lithium battery charging management circuit is using TP4056 as core
The heart.
As preferable technical scheme, the acquisition node is by CC2530 modules and temperature acquisition sensor DS18B20 structures
Into the responsible ZigBee communication modes that pass through transmit Temperature numerical to telegon；
HMI screen display module selects TJC4024K032_011R, after the packaged HMI bottoms function of single-chip microcomputer, warp
The form and single-chip microcomputer for crossing serial communication interact, and single-chip microcomputer instructs the display situation of control screen by serial ports.
The present invention compared with prior art, has the following advantages that and beneficial effect：
1st, the present invention builds energy transmitter module and energy acceptance module using E classes inverter circuit and E class equivalent circuits,
The control to inverter circuit and the function of wireless sensor network node are completed followed by acp chip CC2530, by circuit control
The collection of system and sensor information, transmit and be shown in one, avoid excessively complicated circuit, build succinct effective dress
Put.
2nd, present invention design builds good man-machine interface, and user can with simpler obtain sensor collection letter
Breath, and adds the function of some hommizations, perfect operation interface.
3rd, the present invention demonstrates the Some features of magnetic resonance type wireless energy transfer by some tests, and realizes and entirely set
The function of meter, magnetic resonance type wireless charging sensor network are expected to use in the place of some short-distance and medium-distance, such as smart home
The fields such as field, medical treatment.
Brief description of the drawings
Fig. 1 is the circuit theory diagrams of wireless sensor network node of the present invention；
Fig. 2 is the schematic diagram of E classes inverter circuit of the present invention；
Fig. 3 is metal-oxide-semiconductor drive circuit figure of the present invention；
Fig. 4 is the schematic diagram of E classes rectification circuit of the present invention；
Fig. 5 is the overall simulating schematic diagram of the present invention；
Fig. 6 is Simulation results figure of the present invention；
Fig. 7 is the schematic diagram of CC2530 chips and peripheral circuit of the present invention；
Fig. 8 is TP4056 pinouts of the present invention；
Fig. 9 is DS18B20 sensor circuits figure of the present invention；
Figure 10 is the workflow diagram of Zigbee protocol stack of the present invention；
Figure 11 is telegon workflow diagram of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are unlimited
In this.
Embodiment
As shown in figure 1, a kind of magnetic resonance type wireless charging sensor network nodes design method of the present embodiment, node include
Magnetic resonance type wireless charging device and wireless sensor network framework, the magnetic resonance type wireless charging device are divided into energy transmitting
Module and energy acceptance module, the energy transmitter module include 24V DC power suppliers, Voltage stabilizing module, metal-oxide-semiconductor drive module
With E class inverter circuits；The energy acceptance module, obtained by receiving coil after magnetic resonance obtains energy through E class rectification circuits
Direct current electricity output, give acquisition node charging, the energy acceptance module includes E class rectification circuits, the 24V DC power suppliers and
Voltage stabilizing module connects with E class inverter circuits, and the Voltage stabilizing module, metal-oxide-semiconductor drive module E class inverter circuits are linked in sequence, institute
State and electrically connected between E classes inverter circuit and E class rectification circuits by transmitting coil and receiving coil, the transmitting coil and reception
Coil transmits electric energy in a manner of magnetic resonance；During work, 220V industrial-frequency alternating currents are by the adapter in 24V DC power suppliers
Direct current, then the E class inverter circuits by being controlled by telegon are converted into, alternating current, receiving coil are produced on transmitting coil
Obtain energy by way of magnetic resonance to power to acquisition node by E classes rectification circuit again, Voltage stabilizing module turns 24V direct currents
Change 5V direct currents into and supply electricity to HMI screen and the power supply of metal-oxide-semiconductor drive module；And wireless sensor network is divided into telegon and collection saves
Point, both of which use ZigBee wireless communication modules, and telegon is used to control metal-oxide-semiconductor drive module, receives acquisition node collection
Information and shown on serial ports HMI screen, acquisition node be used for telegon pass on node collection information.
The efficiency of magnetic resonance type wireless energy transfer system and the mutual inductance M of coil have a close ties, magnetic resonance type without
The design of heat input transmission technology transmission coil is most important, the coefficient of coup, quality factor, internal resistance, distribution capacity between coil
There is conclusive effect to the transmission range, transimission power, efficiency of transmission of wireless transmitting system etc. the design of parameters.
The present embodiment transmitting coil and receiving coil will use vertical spin type coil, vertical-type spiral winding per unit body
Magnetic field caused by product coiling is larger, and magnetic field progressively reduces from axis line location along radial direction, and screw type axis line location magnetic field is strong
Degree is most strong, and energy transmission is more concentrated.Magnetic resonance type wireless energy transfer system in actual use between transmission coil often
Misalignment be present, in other words the inconsistent situation of two coil directions, vertical-type spiral winding can then substantially increase transmission coil
The fault-tolerance of aligned in position.
Energy transmitter module first passes around AC/DC adapters and power-frequency voltage 220V alternating currents is converted into 24V direct currents, warp
Self-lock switch, then powered to circuit.When self-lock switch is opened, 24V direct currents are converted to 5V direct currents by LM2596 Voltage stabilizing modules
Electricity, the explanation circuit that brightens of the lamp in the module is in running order, and is powered to metal-oxide-semiconductor driving chip and HMI screen.And coordinate
The square wave that device produces 1MHz gives metal-oxide-semiconductor driving chip, and signal amplification is become opening for N-channel MOS pipe needs by metal-oxide-semiconductor drive circuit
OFF signal, the break-make of metal-oxide-semiconductor cause E classes inverter circuit that 24V direct currents are changed into 1MHz alternating currents, are passed energy by transmitting coil
It is defeated by receiving coil.
Power supply power supply be use 24V adapters, the present embodiment I select be model 2410 24V adapters, this fit
The input range of orchestration is 100V-240V, and working frequency is 50/60Hz, and output is 24V, and the electric current that can be born is 1A.It can be seen that this
It is a kind of adapter with higher input range, avoids because voltage pulsation damages to subsequent conditioning circuit.The adapter simultaneously
Obtain CE and CCC certification, illustrate that the adapter meets national standard, have to SELV (SELV) circuit it is certain every
From and defencive function, prevent the accident such as fault, electric shock caused by the human factors such as maloperation, ensure Electrical Safety, drop
The risk of low subsequent conditioning circuit.And the voltage range that in general N-channel MOS pipe can be born is 2-3 times of supply voltage, because of this implementation
Example is intended to design succinct valid wireless charging device, so the not adapter of selection high voltage and higher-wattage,
The requirements of type selecting to subsequent device is reduced, prevents serious situation of generating heat.
Voltage stabilizing module is to use the adjustable voltage reduction modules of LM2596, and the input voltage of the module reaches as high as 40V, exports 1.5V
To 35V continuously adjustabes, maximum output current 3A.The module has output linearity good and loads the characteristics of adjustable, convenient to set
Debugged during meter, meet the design requirement of 5V voltage stabilizings power supply, be provided simultaneously with overtemperature protection and current-limiting protection function, reduced
The risk of other components.
E class inverter circuits as shown in Figure 2, the power device of the circuit only have one and are operated in Sofe Switch state,
So-called Sofe Switch state is exactly the power device conducting (or shut-off) under no-voltage, under zero current power device shut-off (or
Conducting), realize ZVT (ZVS).At the same time, power device is zero in conducting transient voltage, turn-off transient voltage
It is zero, electric current is zero always in the meantime, that is, occurs without the overlapping situation of electric current and voltage, and this will substantially reduce loss.More enter
One step, when switching tube is opened, the lucky resonance of MOSFET to zero and maintain a bit of time be equal to zero, i.e. its derivative is zero, interior
The fly-wheel diode in portion is not involved in turning on, it is believed that no-voltage derivative switch (ZDS) is realized, because switching tube internal resistance is small,
Approximately think that MOSFET internal losses are zero, conversion efficiency reaches 100%.
In Fig. 2, VCCWhole circuit is supplied electricity to for DC source；L1For choke induction, L2For resonant inductance, their effect has
Institute is different, L1The ripple between suppression dc source is mainly played, so to select sufficiently large choke induction, supplies stabilization
Electric current, L2For series resonance inductor and C2A pair of LC resonant networks are formed, are the key points that can circuit occur resonance, simultaneously
The network also has filter function concurrently, is the alternating current for being approximately equal to sine wave obtained in load.Utilize the storage of electric capacity and inductance
Energy feature, electric energy is changed mutually with magnetic energy, two kinds of energy have maximin, as vibrate, when this vibration will not decline
Subtract and then produce resonance when maintaining certain frequency, the loss for energy of necessarily being accompanied during this energy conversion and outer
Leakage.And magnetic resonance wireless energy transfer system it is this be operated in high frequency situation be issued to MHz circuit generally require MOSFET this
Kind power amplifying device is gone back the signal gradually decayed amplification by feedback mechanism.C1It is the equivalent capacity for simulating MOSFET,
And MOSFET has been generally integrated fly-wheel diode, needed unlike triode additional.
The groundwork process of E class inverter circuits is illustrated below, when MOSFET is off state, MOSFET
No current is by the way that now electric current transfers to flow to MOSFET C in parallel1Equivalent capacity, C1Start to charge up, both end voltage is gradual by zero
Peaking is increased to, current direction is as shown in Fig. 2 meet I1=IC+I2.Start to discharge after electric capacity is fully charged, i.e. ICReversely increase
Greatly, load current starts gradually to increase, and now meets I2=I1+IC, voltage gradually decreases in electric capacity discharge process, when being reduced to zero
When, MOSFET starts transition status, and the diode of MOSFET reverse parallel connections plays afterflow effect.
When MOSFET pipes are on situation, the clamping action of diode causes MOSFET drain-source voltage across poles always
No-voltage is maintained, switching tube approximation regards no-voltage conducting, electric current I as2Gradually decreased by the direction of script, switching tube passes through
Electric current do not stop to increase, until switch tube current IS=I1.As electric current I2It is simply full when starting zero passage and inversely increase
Sufficient IS=I1+I2, reach a certain moment I2Maximum is increased to, i.e. switching tube bears maximum current.Electric current I2Start gradually landing,
ISAlso begin to be gradually reduced until managing equal to zero, MOSFET and start transition status.
During switch OFF, C1、L2、C2、RLForm resonant tank, electric capacity C1First charge and discharge again, L1Release energy and serve
The effect of resonant condition is maintained, switchs and is turned on when voltage is zero, realize ZVS, electric current I2Experienced start from scratch it is positive by
It is cumulative it is big be gradually decrease to again zero process.During switch conduction, L2、C2、RLResonant tank is formed, in this half period
MOSFET drain-source voltage across poles always remains as zero, electric current I2It experienced to start from scratch reversely gradually to increase and be gradually decrease to zero again
Process.
By rational circuit design, E class inverter circuit MOSFET pipes are operated under HF switch state, in a cycle
Electric current I2Close to sine wave, circuit can be allowed to be operated in resistive within the specific limits, the circuit conduct except load resistance
The transmitter module of magnetic resonance type wireless energy transfer system, but load resistance can not change too greatly, it is control and tune
The Primary Component of resonance peak is saved, otherwise will cause the change of output sinusoidal magnitude too greatly, circuit loses resonance.In addition in engineering
On also analyzed by the use of quality factor Q as one and compare resonance circuit.
When MOSFET disconnects, C is defined1、L2、C2、RLForm resonant tank frequency and quality factor be：
With should MOSFET conducting when, L2、C2、RLForm resonant tank frequency and quality factor be：
From formula (1.1) and (1.2), the relation of two resonant tank quality factor is：
It can be seen that quality factor have greatest relation with resonant frequency, inductance L2, load RL from three formula above, I
Can reduce harmonic component pursuing high quality factor, but the loss of inductance and load can be higher, furthermore to remain turned-off
It is consistent with frequency during conducting, is necessary to consider the value of interelectrode capacity when MOSFET is selected, rightly shunt capacitance.
Comprehensive analysis above, when designing magnetic resonance type wireless charging system, the higher resonant frequency of selection can subtract
The power attenuation of few inductance and electric capacity, lifts quality factor, but too high frequency also results in the reduction of operating efficiency, below
It will avoid causing switch hard because of incorrect dutycycle using 1MHz resonant frequencies, dutycycle as 0.5 design circuit
Under on off state, while also reduce the requirement to MOSFET.
Metal-oxide-semiconductor is non-conductive property FET in integrated circuit.It is metal (metal)-oxid (oxide)-
Semiconductor (semiconductor) field-effect transistor, what the present embodiment was mainly used is enhanced N-channel MOS pipe.
It is that metal-oxide-semiconductor is more low in energy consumption than triode that metal-oxide-semiconductor rather than triode main cause have been selected in the design.Metal-oxide-semiconductor is led
Being powered, resistance is smaller, and conduction voltage drop is small, and raster data model belongs to voltage-type, for the circuit of high frequency control, owned diode
Protection, there is good heat resistance characteristic, preferable in the performance of high current occasion.
The present embodiment selects the N-channel radio-frequency power metal-oxide-semiconductor ARF466AG of APT companies, and the metal-oxide-semiconductor operating voltage is reachable
200V, working frequency have very high resistance to breakdown strength, reliability is high, and efficiency is reachable up to 45MHz, power output 300W
75%, while there is the advantages of low thermal resistance.Shortcoming is that volume is larger, it is necessary to which certain space radiates, and price is higher.
The conventional metal-oxide-semiconductor IRF840 small volumes of another kind, inexpensively, highest is pressure-resistant 500V, conducting electric current 8A.By
It is that output current in 24V direct current supplys, adapter is 1A in the present embodiment, belongs to small-power charging system,
The present embodiment has selected the two-way mos pipe driving chip UCC27425 of TI companies, and supply voltage is 4V to 15V, most
Can there are 4A driving force, the compatible inputs of TTL/CMOS greatly, built-in two enabled pin ENBA and ENBB make design and programming more
Add flexibly, open shut-off and the propagation delay time is shorter, inexpensively, circuit is as shown in Figure 3 for price.
Because the CC2530 single-chip processor i/o mouths of the present embodiment are 3.3V outputs, driving current is too small, and metal-oxide-semiconductor can not be normal
Work, and metal-oxide-semiconductor drive circuit is actually by PWM square-wave signals caused by single-chip microcomputer, is amplified to the TTL that metal-oxide-semiconductor can be recognized
Level signal, this requires the driving chip shorter rise time and fall time, while takes into account isolation features in order to avoid controlling core
Piece is reversed electric current and burnt out.UCC27425 just meets above-mentioned requirements, and direct insertion encapsulation to change more convenient.Due to
Two enabled pins are talked about in logical table inside UCC27425 databooks can not be hanging, so the two pins all connect
5V, electric capacity C9 play a part of filtering out ripple, and resistance R1 avoids metal-oxide-semiconductor from being consumed because of electrostatic conducting, and the resistance typically chosen is
10K。
Energy acceptance module obtains direct current electricity output after magnetic resonance obtains energy by receiving coil through E class rectification circuits,
Charged to acquisition node.E classes rectification circuit is made up of a fast recovery diode, actually utilizes the equivalent electric of diode
Hold and carry out discharge and recharge, it is similar to E class inverter circuits, Sofe Switch state is operated in, circuit theory is as shown in Figure 4.It can be known by Fig. 4
Road L1 and C3 composition be filter circuit i.e. conventional L-shaped low pass filter.AC power simulation receiving coil sensing production
Raw alternating current, C1 serve compensating electric capacity, serve resonance and propose efficient effect.When D1, which ends, to be turned off, alternating current is just
Circuit provides direct current to voltage on semiaxis to load RL after filtering, and when D1 is turned on, alternating current actually is born into semiaxis
On voltage be turned in positive axis, still or the constant voltage in direction, and C2 is D1 equivalent capacity to RL, this electric capacity
Value directly affects whether D1 is operated in Sofe Switch state.
The present embodiment has also carried out magnetic resonance type wireless energy transfer entirety emulation experiment, specific as follows：Firstly the need of true
Determine the parameter of transmission coil, the transmitting coil and receiving coil of the present embodiment are all hanging down for 10 circle diameter 2mm, coil radius 10cm
Straight helical coil, it is modeled using ANSYS Maxwell softwares and solves the parameter in coil.
The model of transmission coil is the parameter of model modification cost implementation for selecting software to carry and formed, but is needed
Coil is carried out it is end to end to ensure that electric current has a loop, coil method selection copper (copper), two coil distances are 8cm,
Then need coil being arranged on static field (Magnetostatic) and solved, and add current excitation, solve domain, square
Battle array, iterations and step-length, the self-induction that finally operation emulation obtains transmitting coil L11 are 0.0339mH, receiving coil L22 self-inductions
For 0.03394mH, mutual inductance L12 is 0.00638mH.
It is respectively 430pF and 300pF resonant network C1 and C2 to E classes inverter circuit addition numerical value then according to document,
The resonance compensation network and L-shaped filter circuit that numerical value is 800pF are added in E class rectification circuits, uses PSIM software emulations, figure
5 overall simulating schematic diagrams, Fig. 6 are Simulation results.
As Simulation results it can be seen that V2 is square-wave waveform caused by square wave signal generator VSQ1, frequency is
1MHz, dutycycle 0.5, it can clearly be seen that when frequency is higher, the rise time and fall time of switching signal can not neglect
Slightly, this also complies with the waveform situation of practical devices.The conducting electric current waveform that V1 is the waveform at metal-oxide-semiconductor both ends, I1 is metal-oxide-semiconductor, can
To see that metal-oxide-semiconductor approximately switches off and in no-voltage, the waveform that electric current and voltage overlap is smaller, switching tube approximate duty
In Sofe Switch state, ZVS is realized.V3 is that receiving coil obtains the voltage waveform for being similar to sine wave, and V4 obtains 4.76V direct current
Voltage, illustrate that whole circuit completes 24V direct currents and produces alternating current, receiving coil at transmitting coil both ends by inverter circuit
The available direct current close to 5V is being obtained by rectification circuit by coupling acquisition alternating current.
In order to more intuitively reflect the transmitting procedure of magnetic resonance wireless energy, the present embodiment also uses ANSYS
Simplorer and ANSYS Maxwell carry out associative simulation.Associative simulation is needed integrated circuit figure again in Simplorer
The inside is drawn, and then making the coil inside Maxwell into transient field solves, and using external drive and is added to Simplorer
In, step-length can operation corresponding with Maxwell is finally inputted inside Simplorer and is obtained a result.
The wireless sensor network module that the present embodiment is selected is to have used ZigBee short distance communication technologies, technology tool
There is the characteristics of low-power consumption, low cost, strong flexibility, each node can be built one by way of MANET in a short time
Bridge is communicated, makes each nodal information interaction unblocked.The function of module will be introduced first below, then retell, telegon
With the specific design of acquisition node.
What the present embodiment was selected is the ZigBee development platforms of net honeybee newly manufacturing, and in-kind portion is with more main flow at present
TI companies CC2530 chips with maturation are the module of core, and programming platform is IAR, and protocol stack is Z-stack 2007PRO, should
Module is divided into CC2530 core boards and function bottom board, and core board has used 2.4G omnidirectional antennas, transmission range up to 250 meters, and
Function bottom board has lithium battery charging circuit, Voltage stabilizing module, button, various interfaces, LED light etc., core board and function bottom board
It can splice, CC2530 I/O mouths have been drawn on bottom plate.
It is a to be integrated with enhanced 8051MCU, RF transceiver of industry, 256KB Flash on CC2530 chip reals
ROM and 8KB RAM single-chip microcomputer, there is the characteristics of high-performance, low-power consumption, high receiving sensitivity, strong interference immunity.It has simultaneously
There is powerful ancillary equipment：21 universaling I/O ports, are configurable to general digital I/O mouths or peripheral hardware I/O mouths on I/O mouths, and 8
Road inputs and is configurable to 12 ADC, can be configured to 3 timers (2 8,1 16 general purpose timer) or 2
Individual USART；5 passage DMA functions；Hardware supported CSMA/CA；Received signal strength indicator device (RSSI) and link-quality is supported to refer to
Show (LQI)；With battery monitor and temperature sensor functionality；The small only 24mA and 29mA of current loss is received and dispatched, meets low work(
Consume scene to use, on especially tangible wireless sensor network, chip and peripheral circuit are as shown in Figure 7.
RF radio frequency parts optimize unbalanced antenna by electric capacity C21, C23 and inductance L3, L4 as seen from Figure 7, and
And meet the requirement of 50 ohm of antenna match impedance.In the circuit, it is made up of electric capacity C24, C25 and oscillator Y2
32.768kHz external crystal oscillation circuits, a precise and stable clock signal is provided for system；By electric capacity C26, C27 and oscillator
The 32MHz external crystal oscillation circuits of Y1 compositions, clock source is provided for RF transceivers or for main system, and electric capacity C28 is 1.8V
Decoupling effect is provided when voltage-stablizer is run.
Lithium battery charging management circuit inside the module is made by core of TP4056, the institute of chip pin figure such as 8
Show.The chip is particularly suitable for providing constant current, constant voltage charging to single lithium battery, and integrated level is higher, and peripheral circuit is simple, tool
There are under-voltage protection, battery temperature detect, recharge automatically, the function of failure output.
When power input voltage, which is more than power supply low voltage test threshold values and pin 8, connects high level, TP4056 starts pair
Battery charges, and now pin 7 exports low level, if be less than trickle charge thresholding 3V, chip can carry out low current to battery
Charging, slowly recovers battery.Generally cell voltage is charged more than 3V, chip using weighing apparatus stream mode, charging current
Depending on the outer meeting resistance of pin 2, here from the charging current for corresponding to 4K resistance being 300mA, when cell voltage is close to 4.2V
When, charged using constant voltage mode, pin 6 exports low level at the end of charge cycle.
The module has used HT7533 to only have three pins to be respectively as the conversion chip for obtaining 3.3V voltages, the chip
Input, output, power supply, only filter capacitor need to be connect in input and output pin, the chip can bear 24V input electricity
Pressure, output can reach 100mA, and wider input voltage can be good at protecting circuit, prevent that receiving terminal commutating voltage is excessive
And burn out module.
The operating system based on IEEE 802.15.4/ZigBee protocol stacks is embedded on CC2530 pieces, the operation system
System is scheduled by the OSAL protocol stack programs of level of abstraction.The popular Zigbee protocol stack for saying CC2530 is by IEEE
802.15.4 PHY (physical layer) and MAC (media access layer) are defined, NWK (Internet), APS are defined with ZigBee alliances
(application program support sublayer), APL (application layer) gather together, and are presented with functional form, user need to only be concerned about application layer
Function, application layer is modified and can be communicated in fact, without concern bottom code.
The effect of telegon is similar to transfer base station, is the bridge of each acquisition node of connection and host computer, while it
Being building network, person is responsible for transmission and storage node information.The telegon of the present embodiment is to have selected a CC2530 module, should
Module carries out networking with acquisition node, is received and sent messages by point-to-point form.
Telegon produces the input pin INA that 1MHz square waves drive dynamic chip UCC27425 to metal-oxide-semiconductor on pin P1.0,
And with the chip altogether；Pin P0.2 (RX) and pin P0.3 (TX) connection HMI serial ports shows that Folding-Screen TX and RX realizes that serial ports leads to
News, the sensor information that telegon collects acquisition node are sent on serial ports screen and shown.
The present embodiment acquisition node is made up of CC2530 modules and temperature acquisition sensor DS18B20, is responsible for passing through
ZigBee communication modes transmit Temperature numerical to telegon.The pin P0.6 connections DS18B20 of economize on electricity DQ ends are gathered, module is
Sensor provides 3.3V voltages, and, sensor circuit is as shown in Figure 9 with single-chip microcomputer altogether.
DS18B20 can carry out single-bus two-way communication with single-chip microcomputer, and R1 is that pull-up resistor makes sensor wait at one's leisure
High level is kept, the temperature range that it can be measured is -55 degrees Celsius to+125 degrees Celsius, and precision is higher, can be to resolution ratio
It is programmed.
HMI (Human Machine Interface), also referred to as man-machine interface, it is that user and system carry out information exchange
Medium.The serial ports HMI screen model that the present embodiment uses is TJC4024K032_011R, is a resistive touch formula screen,
The pixel of the screen is 400 × 240, operating voltage 5V, if operating voltage less than 5V, touch screen will failure, so
LM2596 is needed to provide a stable 5V voltages to screen.
After the screen is indeed through the packaged HMI bottoms function of single-chip microcomputer, by the form and monolithic of serial communication
Machine interacts, and single-chip microcomputer can instruct the display situation of control screen by serial ports.The maximum benefit of the screen is integrated level
Height, peripheral circuit is not required too, interface display is that inside screen is realized, single-chip microcomputer can simply by simple instruction
To realize control, shown without by controlling the dot matrix on screen to carry out picture, greatly reduce the occupancy to single-chip microcomputer internal memory, together
When improve screen display speed.The also supporting upper software of the screen, it is the software of a OOP, similar to VB's
Operation style, the construction cycle is greatly reduced, shortcoming is exactly somewhat expensive, and resistive touch Folding-Screen long-term uses easily touch
Ineffective situation, if there is Folding-Screen phenomenons are split, screen can not just be used, and certain pressure is needed during touch without as capacitive touch
It is good to touch Folding-Screen senses of touch.
The function that the present embodiment serial ports HMI screen can be realized：Boot animation；Sample temperature shows, power down storage temperature
Upper and lower bound value；Charged state is shown；Display and setting RTC clock；Set and preserve screen brightness value；Sleep pattern and touch
Touch wake-up.
The present embodiment proposes the framework of magnetic resonance type wireless charging sensor network nodes on the whole, then it is specific introduce and
Analyze the function of modules；Each functional module analyzes their advantage and disadvantage, to hardware design by the contrast with common scheme
Main points verified, provide foundation for the type selecting of modules.Modules pass is provided according to being discussed in detail for design
The chip type selecting and parameter characteristic of key, and illustrate that its principle designs peripheral circuit, the relation of intermodule is elaborated, and pass through emulation
The feasibility of interlock circuit is demonstrated, designs a succinct valid wireless charge sensors network node.
For the Software for Design of inventive sensor node, it is IAR to be previously mentioned that CC2530 software development environments, it
It is a completely compatible C language, for the compiling of the completion program of different chip high efficient and reliables, while he has emulation and adjusted
The function of examination, it is very easy to use.The present invention will enter line code under IAR development environments to wireless sensor network node
Write, selection is protocol stack Z-Stack-CC2530-2.3.0 of the TI companies based on ZigBee2007, and opening software can be
Working space sees the structure of whole protocol stack.
The workflow of Zigbee protocol stack：Hardware detection is carried out first and chip is initialized, to ensure system
Being capable of normal work；Then operating system abstract layer OSAL initialization is carried out；Then perform OSAL and realize task poll.
Need to pay close attention to two function OSAL initialization function osal_init_system () herein and OSAL performs function
osal_start_system().It is in initialization respectively to have 6 initialization functions in osal_init_system () function
Deposit system function osal_mem_init (), initial message queue osal_qHead=NULL, initialization clock function
OsalTimerInit (), initialization power management function osal_pwrmgr_init (), initialization system task function
OsalInitTasks (), initialization storehouse osal_mem_kick ().Wherein with user it is closely bound up be
OsalInitTasks () function.
Task ID number often initializes a function since 0 and performed from increasing, and totally 6 functions are initialised, and this 6 functions are worked as
Middle user needs to be initialized according to the hardware device of oneself, and wherein ZDApp_Init (taskID++) function is for setting up
Network, Accreditation System message and ZDO message, the most key is SampleApp_Init (taskID) function, can be in engineering
See this in APP files SampleApp.c inside catalogue, and APP is exactly application layer, it is user's needs to illustrate the function
The function of operation, user write initial configuration in the function according to the hardware device of oneself.
After OSAL is initialized, it is osal_run_system () function to be performed into OSAL inside function, should
Function realizes multi-task scheduling by polling mode, and in a short time simultaneously, when multiple events occur, OSAL is according to priority
Each event handling function is distributed to, if not having event registration, system is put into sleep state, never returns to
In principal function.
The task number for judging to obtain limit priority in polling mechanism actually interrupts temporary subsequently into critical zone
Stop, then extract event, find corresponding processing event, processing event is carried out by structure tasksArr [idx], at this
It can be seen that event handling function SampleApp_ProcessEvent (), it is also in APP files in structure
Inside SampleApp.c, user can write on button.onrelease inside this function.
Zigbee protocol stack has readability well, and user need to only be concerned about the SampleApp.c inside application layer, then enter
Some configurations of row can develop to protocol stack, and the workflow of whole Zigbee protocol stack is as shown in Figure 10.
The PWM square-wave signals control driving metal-oxide-semiconductor and connect that telegon plays and produces 1MHz in the present invention, dutycycle is 0.5
Receive acquisition node temperature information and complete the function of host computer (screen) display, the flow entirely to work is as shown in figure 11.
It is previously mentioned that when user will carry out peripheral configuration, it is necessary to be carried out into SampleApp_Init () function
Program, we need to carry out two kinds of configurations herein, and one kind is PWM configurations, produces suitable square wave, another kind is that serial ports is matched somebody with somebody
Put, screen is communicated with single-chip microcomputer.
P1.0 is exported as common I/O mouths, and what PWM was used is timer 1, and limit priority is set to,
Due to needing to be operated in RF reiving/transmitting states, therefore system clock is 32MHz, and this configuration can be in principal function HAL_BOARD_
INIT () sees.And the design needs to produce 1MHz PWM, suitable mode is selected to produce each accounting in a cycle
50% low and high level.Here what is selected is the mode for forward counting/count down, i.e. T1CC2 compared with T1CC0, when equal to
During the burned numerical value of T1CC0, high level is exported；When the numerical value equal to T1CC2, low level is exported.
Serial ports configuration needs to see MT_UartInit () function, because serial ports HMI screen default baud rate is 9600,
Need the MT_UART_DEFAULT_BAUDRATE inside the function being defined as HAL_UART_BR_9600, closing flow control only makes
Communicated with TX/RX, reselection uses USART0, i.e. pin P0.2 (RX) and pin P0.3 (TX).
Serial ports needs to carry out serial ports transmission processing after configuring, and needs to add when sending data to host computer serial ports screen
Three 0xff end mark, screen could be identified and using data, and 3 character strings sent in figure are meant in control T0
The value in face makes the character type temperature value after conversion into, it is possible to by temperature real-time display on screen.
Collection for node, the present invention have used a collection section to build an easy wireless sensor network
Point, the mode for employing program request are sent to telegon, avoid, because data redundancy caused by broadcast and multicast, making signal transmission more
Add stabilization.
When judge there occurs send event when, enter trip temperature send processing function, and osal_start_timerEx be by
It is arranged to send temperature every 5s.It is to switch to the value collected from DS18B20 temperature sensors that temperature, which sends processing function,
Character type is sent, and space is more saved than integer.
CoodinatorEB is selected after completing all codes, is downloaded on telegon；EndDeviceEB is selected, is downloaded to
CC2530 Software for Design can be completed on acquisition node.
The host computer of the present invention is serial ports HMI screen, and the supporting exploitation software of the screen is USART HMI, and wherein this is soft
Part maximum feature is to use character string instruction, not only avoids cumbersome 16 systems instruction, also improves the refresh rate of screen,
The assignment of control property supports easy computing simultaneously, improves the readability of program, abandons cumbersome address configuration.
The serial ports HMI screen of the present invention shows stronger technology sense using blueness as dominant hue, and it is dynamic that start is had when upper electric
Draw, there is charging display, temperature display, three functions are set, it is only necessary to which each function interface can be entered by clicking on respective icon.
Above-described embodiment is the preferable embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any Spirit Essences without departing from the present invention with made under principle change, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (10)
1. a kind of magnetic resonance type wireless charging sensor network nodes design method, it is characterised in that node includes magnetic resonance type
Wireless charging device and wireless sensor network framework, the magnetic resonance type wireless charging device are divided into energy transmitter module and energy
Receiving module is measured, it is inverse that the energy transmitter module includes 24V DC power suppliers, Voltage stabilizing module, metal-oxide-semiconductor drive module and E classes
Become circuit；The energy acceptance module, it is defeated after magnetic resonance obtains energy through E class rectification circuits to obtain direct current by receiving coil
Go out, charged to acquisition node, the energy acceptance module includes E class rectification circuits, the 24V DC power suppliers and Voltage stabilizing module
Connected with E class inverter circuits, the Voltage stabilizing module, metal-oxide-semiconductor drive module E class inverter circuits are linked in sequence, the E classes inversion
Electrically connected between circuit and E class rectification circuits by transmitting coil and receiving coil, the transmitting coil and receiving coil are with magnetic
The mode of resonance transmits electric energy；During work, the adapter that 220V industrial-frequency alternating currents pass through in 24V DC power suppliers is converted into directly
Stream electricity, then the E class inverter circuits by being controlled by telegon, produce alternating current, receiving coil is total to by magnetic on transmitting coil
The mode shaken obtains energy and gives acquisition node power supply by E classes rectification circuit again, and it is straight that 24V direct currents are converted into 5V by Voltage stabilizing module
Stream supplies electricity to HMI screen module and the power supply of metal-oxide-semiconductor drive module；And wireless sensor network is divided into telegon and acquisition node, two
Person uses ZigBee wireless communication modules, and telegon is used to control metal-oxide-semiconductor drive module, receives the information of acquisition node collection
And shown on serial ports HMI screen, acquisition node is used to pass on node collection information to telegon.
2. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
Transmitting coil and receiving coil use vertical spin type coil.
3. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
Energy transmitter module first passes around AC/DC adapters and power-frequency voltage 220V alternating currents is converted into 24V direct currents, is opened through self-locking
Close, then powered to circuit；When self-lock switch is opened, 24V direct currents are converted to 5V direct currents by Voltage stabilizing module, on Voltage stabilizing module
The lamp explanation circuit that brightens it is in running order, and powered to metal-oxide-semiconductor drive module and HMI screen；And side caused by telegon
Ripple is transferred to the chip of metal-oxide-semiconductor drive module, and the switch that metal-oxide-semiconductor drive module becomes signal amplification N-channel MOS pipe needs is believed
Number, the break-make of metal-oxide-semiconductor causes E classes inverter circuit that 24V direct currents are changed into alternating current, and reception is given the energy to by transmitting coil
Coil.
4. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
The power supply of 24V dc sources uses 24V adapters, and the 24V adapters select 2410 models；The Voltage stabilizing module is steady using LM2596
Die block；
Telegon is to have selected a CC2530 module, and the module carries out networking with acquisition node, is received by point-to-point form
Photos and sending messages.
5. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
E class inverter circuits include：MOSFET, dc source VCC, choke induction L1, resonant inductance L2, electric capacity C1, electric capacity C2With resistance RL,
Dc source VCCPowered for whole E classes inverter circuit, choke induction L1It is arranged on dc source VCCBetween MOSFET, MOSFET
And with electric capacity C1In parallel, the resonant inductance L with resistance RL2With electric capacity C2, it is in parallel；L1For suppressing the ripple between dc source, therefore select
Sufficiently large choke induction is selected, supplies stable electric current, L2For series resonance inductor and C2A pair of LC resonant networks are formed, are electricity
Can road occur the key point of resonance, while the resonant network also has filter function concurrently, special using the energy storage of electric capacity and inductance
Sign, electric energy is changed mutually with magnetic energy, and MOSFET is gone back the signal gradually decayed amplification by feedback mechanism, C1It is simulation
MOSFET equivalent capacity, and MOSFET has been generally integrated fly-wheel diode.
6. magnetic resonance type wireless charging sensor network nodes design method according to claim 5, it is characterised in that described
The course of work of E class inverter circuits is as follows：
When MOSFET is off state, MOSFET no currents are by the way that now electric current transfers to flow to MOSFET C in parallel1It is equivalent
Electric capacity, C1Start to charge up, both end voltage is gradually increased to peaking by zero, meets I1=IC+I2；Start to put after electric capacity is fully charged
Electricity, i.e. ICInversely increase, load current starts gradually to increase, and now meets I2=I1+IC, voltage is gradual in electric capacity discharge process
Reduce, when being reduced to zero, MOSFET starts transition status, and the diode of MOSFET reverse parallel connections plays afterflow effect；
When MOSFET pipes are on situation, the clamping action of diode causes MOSFET drain-source voltage across poles to maintain always
In no-voltage, switching tube approximation regards no-voltage conducting, electric current I as2Gradually decreased by the direction of script, the electric current that switching tube passes through
Do not stop to increase, until switching tube current IS=I1；As electric current I2When starting zero passage and inversely increase, simply meet IS=I1
+I2, reach a certain moment I2Maximum is increased to, i.e. switching tube bears maximum current；Electric current I2Start gradually landing, ISAlso open
Beginning is gradually reduced until being managed equal to zero, MOSFET and starts transition status；
During switch OFF, C1、L2、C2、RLForm resonant tank, electric capacity C1First charge and discharge again, L1Release energy and serve maintenance
The effect of resonant condition, switch and turned on when voltage is zero, realize ZVS, electric current I2It experienced positive gradually increasing of starting from scratch
It is gradually decrease to zero process again greatly；
During switch conduction, L2、C2、RLResonant tank is formed, MOSFET drain-sources voltage across poles always remains as in this half period
Zero, electric current I2It experienced to start from scratch and reversely gradually increase the process for being gradually decrease to zero again.
7. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
Metal-oxide-semiconductor drive module selects two-way mos pipe driving chip UCC27425, and supply voltage is 4V to 15V, maximum 4A driving energy
Power, the compatible inputs of TTL/CMOS, built-in two enabled pin ENBA and ENBB.
8. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
E classes rectification circuit includes electric capacity C1, a fast recovery diode D1, electric capacity C2, inductance L1, electric capacity C3 and inductance RL, L1
With C3 composition be filter circuit i.e. conventional L-shaped low pass filter, AC power simulation receiving coil sensing produce friendship
Stream electricity, C1 serve compensating electric capacity, serve resonance and propose efficient effect, when D1, which ends, to be turned off, alternating current positive axis
On voltage after filtering circuit to load RL provide direct current, when D1 turn on, by alternating current bear on semiaxis voltage upset
Onto positive axis, still or the constant voltage in direction, and C2 is D1 equivalent capacity to RL, and the value of this electric capacity directly affects D1
Whether Sofe Switch state is operated in.
9. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that described
ZigBee wireless communication modules select CC2530 ZigBee communication modules, and the module is by CC2530 chips and peripheral circuit group
Into, peripheral circuit include RF radio frequency parts, 32.768kHz external crystal oscillation circuits, 32.768kHz, clock source, decoupling circuit and
Lithium battery charging management circuit；The RF radio frequency parts optimize unbalanced antenna by electric capacity C21, C23 and inductance L3, L4,
And meet the requirement of 50 ohm of antenna match impedance；32.768kHz external crystal oscillation circuits are by electric capacity C24, C25 and oscillator Y2
Composition, a precise and stable clock signal is provided for system；32MHz external crystal oscillation circuits are by electric capacity C26, C27 and oscillator
Y1 is formed, and clock source is provided for RF transceivers or for main system；When decoupling circuit is run by electric capacity C28 for 1.8V voltage-stablizers
Decoupling effect is provided；Lithium battery charging management circuit is using TP4056 as core.
10. magnetic resonance type wireless charging sensor network nodes design method according to claim 1, it is characterised in that institute
State acquisition node to be made up of CC2530 modules and temperature acquisition sensor DS18B20, be responsible for passing through ZigBee communication modes to association
Device is adjusted to transmit Temperature numerical；
HMI screen display module selects TJC4024K032_011R, after the packaged HMI bottoms function of single-chip microcomputer, by string
The form of mouth communication interacts with single-chip microcomputer, and single-chip microcomputer passes through the display situation that serial ports instructs control screen.
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| CN108270347A (en) * | 2018-02-28 | 2018-07-10 | 深圳市鼎硕同邦科技有限公司 | The direct current output low-frequency ripple compensation circuit and its control method of digital charge machine |
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| CN114062741B (en) * | 2021-10-29 | 2023-02-21 | 威胜信息技术股份有限公司 | Square wave envelope type micro-topology signal generation system and method |
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