CN205882804U - Wireless charging circuit of lithium cell - Google Patents
Wireless charging circuit of lithium cell Download PDFInfo
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- CN205882804U CN205882804U CN201620743011.3U CN201620743011U CN205882804U CN 205882804 U CN205882804 U CN 205882804U CN 201620743011 U CN201620743011 U CN 201620743011U CN 205882804 U CN205882804 U CN 205882804U
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Abstract
The utility model belongs to the technical field of the battery is wireless to charge, specifically provide a wireless charging circuit of lithium cell, including transmit section branch and receiving part, wherein the transmit section branch comprises oscillation circuit (1), high frequency power amplifier circuit (2) and transmitting coil (3), receiving part comprises receiving coil (4), rectification filter circuit (5) and charging circuit (6), oscillation circuit (1) is connected with high frequency power amplifier circuit (2) electricity, and high frequency power amplifier circuit (2) are connected with transmitting coil (3) electricity, receiving coil (4) are connected with rectification filter circuit (5) electricity, and rectification filter circuit (5) are connected with charging circuit (6) electricity. The utility model discloses the effectual mistake that has prevented that the lithium batteries in -process from probably appearing is filled, high temperature, the emergence of the electric current dangerous condition such as too big. Whole circuit structure is simple, and job stabilization, receiving terminal have realized miniaturized requirement, have reached the practical application level.
Description
Technical field
This utility model belongs to battery wireless charging technical field, is specifically related to a kind of wireless charging circuit of lithium battery.
Background technology
When human social development to information age, various electronic products have come into people's like the mushrooms after rain
Life.MP3, MP4, smart mobile phone, panel computer and small-sized movable office equipment, electronic product moves towards many from unification
Unitization, along with functional integration is more and more higher, electronic product screen is increasing, and the power consumption of electronic product also grows with each passing day.
And battery technology could not catch up with the development speed of electronic product, a lot of smart phone users fill even one day facing to every day one
The awkward situation filled is had no way out more.Additionally, the life style of modern humans and consumption idea are covered with the most also there occurs to overturn the heavens
The change on ground.People are no longer satisfied with electronic product and only possess common use function, and are desirable to electronic product and are provided simultaneously with
The outward appearance of fashion, fashionable design, more succinct Consumer's Experience.According to investigation, many consumers are for various numerous and diverse power supplys
Line, the most general worries felt very of the electronic product accessories such as data wire.People need the convenience that can use whenever and wherever possible
Charging device.
In addition to the market demand brought due to the sharp increase of electronic product power consumption, existing electronic product generally has one
Charger the most one to one, thus brings significant wastage and the consumption of resource；And the charging between different electronic products
Device is the most general also can bring extra trouble to user.Additionally, existing wired charging technique specially stays one must to electronic product
Individual charging inlet, the potential threat of this fault such as electronic product generation immersion just.
And wireless charging technology shares one owing to not having the constraint of charging inlet can realize variety classes electronic product
Charger, and there is no the constraint of electric wire, such that it is able to simplify the life of people, it is provided that the user more modernized to consumer
Experience.After wireless charging technology have passed through popularization and the evolution of several years, the most finally start to be paid close attention to by people.
Wireless charging refers to that the device with battery obtains electric power by wireless modes such as electromagnetic induction and is charged.Nothing
The appearance of line charging technique, one is to solve in the case of existing battery technology does not catches up with electronic product development, making user
Obtain the most conveniently charge requirement；Two is to be unified by existing skimble-scamble electronic product power source interface, solves
The certainly problem of charger versatility；Three is that wireless charging need not external charge interface, thus solves electronic product immersion and ask
Topic, it is also possible to prevent dust from entering electronic product.
Wireless power transmission is to carry out electric power transmission by electromagnetic wave, thus saves a kind of Novel electric of power line and socket
Source.Realized the transmission of radio energy by way of electromagnetic induction, its essence is that transformator is theoretical, and Switching Power Supply is theoretical electric with the modern times
The combination that magnetic is theoretical.Generally, utilize way of electromagnetic induction to realize wireless power transmission, electric energy transmitting terminal and electric energy should be comprised
Receiving terminal two large divisions.Its schematic diagram is as shown in Fig. 1, as it can be seen, first, alternating current becomes straight by current rectifying and wave filtering circuit
Stream electricity, unidirectional current obtains high-frequency alternating current by resonant transform circuit again, the transmitting line in the emitted module of high-frequency ac current
Circle, transmitting coil can be to aerial radiated electromagnetic wave, and according to electromagnetic induction principle, the receiving coil being now in variation magnetic field is just
Corresponding induction electromotive force can be produced, it is achieved thereby that the radio transmission of electric energy.And receiving coil obtain be equally exchange
Electricity, so also should obtain unidirectional current through a rectification transformating circuit.
The kind of battery is a lot of currently on the market, but in the design of small-power electronic product, battery used is basic
On be all lithium battery.And why lithium battery can occupy absolute advantage in small-power electronic product market.Radio energy is passed
Opinion in the wrong combines with lithium cell charging principle, just constitutes the basic theories of lithium battery wireless charging.Existing radio energy
Transmission theory is central also in development, also needs the most perfect, especially the wireless charging technical field to lithium battery.But,
Through having company and scientific research institution to be made that the sample of some wireless power products in its field being familiar with, but these samples all have
Power is little, and transmission range is short, and low grade of efficiency of transmission limits, and can only have its using value in limited application scenario.Relative to
For theoretical immature of wireless power transmission, lithium cell charging principle and charging circuit are recognized by people the most widely,
And have also already been large-scale utilization, but be badly in need of being further developed into the wireless charging technology of ripe lithium battery so that energy
Enough providing a kind of power big, long transmission distance, transmission stablize and efficiency of transmission is high, security performance is more preferable and circuit structure is simple
Lithium battery wireless charging technology.
Utility model content
The purpose of this utility model is to overcome the transmission that there is lithium battery wireless charging present in above-mentioned prior art
Efficiency is low, poor stability, the immature problem of technology such as safety is low, circuit structure is complicated, it is provided that a kind of lithium battery wireless charging
Circuit.
The technical solution of the utility model is: a kind of wireless charging circuit of lithium battery, including emitting portion and receiving portion,
Wherein emitting portion is made up of oscillating circuit, high-frequency amplifier circuit and transmitting coil；Receiving portion is by receiving coil, rectification filter
Wave circuit and charging circuit composition；Described oscillating circuit electrically connects with high-frequency amplifier circuit, high-frequency amplifier circuit and transmitting line
Circle electrical connection；Receiving coil electrically connects with current rectifying and wave filtering circuit, and current rectifying and wave filtering circuit electrically connects with charging circuit；Transmitting coil with
Receiving coil is a pair coupling coil, and they realize transmission and the reception of electric energy by the way of electromagnetic induction, it is characterised in that:
Described high-frequency amplifier circuit connects the direct current regulation circuit providing running voltage to it, and this direct current regulation circuit includes transformation
Device, bridge rectifier, filter circuit and LM317 voltage stabilizing chip, wherein, the input of transformator connects 220V alternating current,
The outfan of transformator electrically connects with the input of bridge rectifier, and the outfan of bridge rectifier is defeated with filter circuit
Entering end electrical connection, the outfan of filter circuit electrically connects with LM317 voltage stabilizing chip, LM317 voltage stabilizing chip output radio frequency power amplifier electricity
DC voltage needed for road；Described high-frequency amplifier circuit uses field effect transistor power amplifier, and its field effect transistor is enhancement mode N-MOS
Field effect transistor, the grid G connection control signal of this field effect transistor, its source S ground connection, and between source S with drain D, it is connected voltage stabilizing
Diode, the anode of Zener diode is connected with source S；The drain D of field effect transistor connects one end of electric capacity C, another of electric capacity C
End connects the unidirectional current pressure side of LM317 voltage stabilizing chip output, and the two ends of electric capacity C are parallel with tunable capacitor Cp and inductance L respectively；
Described oscillating circuit uses NE555 timing IC chip to constitute the multi-resonant oscillating circuit of frequency-adjustable；The transmitting of composition coupling coil
Coil uses multilamellar hollow coil with receiving coil.
DC voltage needed for the high-frequency amplifier circuit of above-mentioned LM317 voltage stabilizing chip output is 12V DC voltage.
Above-mentioned multilamellar hollow coil specifically uses SMD coupling coil, and the shape of its transmitting coil is circular, a diameter of
9cm;The number of turns is 20；The shape of receiving coil is circular, a diameter of 9cm;The number of turns is 20；Copper wire diameter is 0.8mm,
Coil height is 3cm, coil-winding mode be close around；Coil inductance is L=480uH.
Above-mentioned oscillating circuit uses NE555 timing IC chip to constitute the multi-resonant oscillating circuit of frequency-adjustable, its NE555 timing
The GND foot ground connection of IC chip, GND foot that is 1 foot, this 1 foot is also respectively connected with one end of electric capacity C1 and C2, another of wherein electric capacity C1
End is connected with 5 feet, and the other end of C2 is simultaneously connected with 2 feet and 6 feet and one end of resistance R1, the other end of resistance R1 and adjustable electric
Resistance R2 connects, and the other end of adjustable resistance R2 is connected with 7 feet of NE555 timing IC chip and one end of R4, the other end of R4
Being connected with one end of adjustable resistance R3, the other end of adjustable resistance R3 and 8 feet connect and are connected simultaneously to 4 feet.
The beneficial effects of the utility model: this utility model uses way of electromagnetic induction, fully combines magnetic coupling technology
And switch power technology.System is divided into emitting portion and receiving portion, and under 12V power supply is powered, receiving terminal is in the distance of 2.5cm
Interior can stably export 4.2V charging voltage, it is achieved that charging current adjustable lithium battery wireless charging function.Further, circuit transmission
The generation of the problems such as end, with circuit protection function, can effectively prevent power MOS pipe from being punctured by peak voltage, short circuit.Receiving
Holding the feature for lithium cell charging to be designed, be likely to occur during being effectively prevented lithium cell charging overcharges, temperature
Spend height, the excessive generation waiting dangerous situation of electric current.Whole circuit structure is simple, and working stability, receiving terminal achieves miniaturization
Requirement, reached actual application level.
Below with reference to accompanying drawing, this utility model is described in further details.
Accompanying drawing explanation
Fig. 1 is that way of electromagnetic induction realizes wireless power transmission schematic diagram；
Fig. 2 be Mutual Inductance Coupling realize electric energy be wirelessly transferred schematic diagram；
Fig. 3 is LM317 work block diagram；
Fig. 4 is that LM317 constitutes+12V circuit diagram；
Fig. 5 is field effect transistor power amplifier figure；
Fig. 6 is that NE555 constitutes frequency and the multi-resonant oscillating circuit of tune.
Description of reference numerals: 1, oscillating circuit；2, high-frequency amplifier circuit；3, transmitting coil；4, receiving coil；5, rectification filter
Wave circuit；6, charging circuit.
Detailed description of the invention
Embodiment 1:
As in figure 2 it is shown, this utility model provides a kind of wireless charging circuit of lithium battery, including emitting portion and acceptance division
Point, wherein emitting portion is made up of oscillating circuit 1, high-frequency amplifier circuit 2 and transmitting coil 3；Receiving portion is by receiving coil
4, current rectifying and wave filtering circuit 5 and charging circuit 6 form；Described oscillating circuit 1 electrically connects with high-frequency amplifier circuit 2, radio frequency power amplifier
Circuit 2 electrically connects with transmitting coil 3；Receiving coil 4 electrically connects with current rectifying and wave filtering circuit 5, current rectifying and wave filtering circuit 5 and charging circuit
6 electrical connections；Transmitting coil 3 and receiving coil 4 are a pair coupling coil, and they realize sending out of electric energy by the way of electromagnetic induction
Sending and receive, described high-frequency amplifier circuit 2 connects to be had to the direct current regulation circuit of its offer running voltage, as it is shown on figure 3, this is straight
Stream mu balanced circuit includes transformator, bridge rectifier, filter circuit and LM317 voltage stabilizing chip, wherein, the input of transformator
End connects 220V alternating current, and the outfan of transformator electrically connects with the input of bridge rectifier, bridge rectifier defeated
Going out end to electrically connect with the input of filter circuit, the outfan of filter circuit electrically connects with LM317 voltage stabilizing chip, LM317 voltage stabilizing
DC voltage needed for chip output high-frequency amplifier circuit 2；As it is shown in figure 5, described high-frequency amplifier circuit 2 uses field effect transistor merit
Electric discharge road, its field effect transistor is enhancement mode N-MOS field effect transistor, the grid G connection control signal of this field effect transistor, its source S
Being connected Zener diode between ground connection, and source S with drain D, the anode of Zener diode is connected with source S；Field effect transistor
Drain D connects one end of electric capacity C, and the other end of electric capacity C connects the unidirectional current pressure side of LM317 voltage stabilizing chip output, the two of electric capacity C
End is parallel with tunable capacitor Cp and inductance L respectively；Described oscillating circuit 1 uses NE555 timing IC chip to constitute frequency-adjustable
Multi-resonant oscillating circuit；The transmitting coil 3 of composition coupling coil uses multilamellar hollow coil with receiving coil 4.
This utility model uses way of electromagnetic induction, fully combines magnetic coupling technology and switch power technology.System is divided
For emitting portion and receiving portion, it is achieved that charging current adjustable lithium battery wireless charging function.Whole circuit structure is simple,
Working stability, receiving terminal achieves the requirement of miniaturization, has reached actual application level.
Embodiment 2:
On the basis of embodiment 1, as shown in Figure 4, LM317 is used to constitute+12V circuit diagram, then LM317 for the present embodiment
DC voltage needed for the high-frequency amplifier circuit 2 of voltage stabilizing chip output is 12V DC voltage.Described multilamellar hollow coil is specifically adopted
Using SMD coupling coil, the shape of its transmitting coil (3) is circular, a diameter of 9cm;The number of turns is 20；Receiving coil (4)
Shape be circular, a diameter of 9cm;The number of turns is 20；Copper wire diameter is 0.8mm, and coil height is 3cm, coil-winding side
Formula be close around；Coil inductance is L=480uH.As shown in Figure 6, described oscillating circuit 1 uses NE555 timing IC chip to constitute frequency
Adjustable multi-resonant oscillating circuit, the GND foot ground connection of its NE555 timing IC chip, GND foot that is 1 foot, this 1 foot is also respectively connected with electricity
Holding one end of C1 and C2, wherein the other end and 5 feet of electric capacity C1 connect, and the other end of C2 is simultaneously connected with 2 feet and 6 feet and resistance
One end of R1, the other end of resistance R1 is connected with adjustable resistance R2, the other end of adjustable resistance R2 and NE555 timing IC chip
One end of 7 feet and R4 connects, and the other end of R4 is connected with one end of adjustable resistance R3, the other end of adjustable resistance R3 and 8 feet
Connect and be connected simultaneously to 4 feet.
The situation of this utility model circuit described in detail below each main circuit part:
1, current rectifying and wave filtering circuit
Alternating current is changed into unidirectional current by the effect of rectification circuit exactly.Conventional rectification circuit has single phase half wave rectification electricity
Road, single-phase full-wave rectifer circuit, single phase full wave bridge rectifying, single-phase voltage doubling rectifier circuit, three-phase full wave rectifier circuit, three
Phase half-wave rectification circuit etc..The effect of filter circuit is to remove the alternating component being likely present in rectified rear circuit, improves
The quality of DC source.This utility model uses single phase bridge type rectifier circu, is followed by filter capacitor.
Single phase bridge type rectifier circu is the one-way conduction characteristic utilizing diode, with four identical diode arrangement Cheng Qiao
Formula structure (see figure 4), reaches to be changed into alternating current galvanic purpose
It is by the way of electromagnetic induction in wireless power technology and existing skill that this utility model realizes lithium battery wireless charging
The lithium cell charging technology of art combines, and is realized transmission and the reception of electric energy by two coupling coils.In electromagnetic induction side
During formula realizes wireless power transmission, the transmission of electric energy and reception need to be formed fast-changing electric field and magnetic field, quickly
The electric field of change is that the high-frequency alternating current generated by electric energy transmitting terminal is realized, and high-frequency alternating current is by by civil power
Be converted to what unidirectional current was produced by high-frequency inversion again.And at electric energy receiving terminal, according to existing lithium cell charging theory, this reality
By the novel control circuit adding a lithium cell charging, to guarantee that lithium battery just can only enter under being in suitable state
Row charging, and in charging process, according to charging process, whether control circuit can occur that exception and battery have filled
The concrete condition such as full controls whole charging process, and wherein this control circuit is that prior art is held and accomplished very much, is not described in detail in this.
This utility model basic scheme is as shown in Fig. 2, and wireless charging system is broadly divided into emitting portion and receiving portion.Emitting portion
It is made up of oscillating circuit, high-frequency amplifier circuit and transmitting coil；Receiving portion is by receiving coil, current rectifying and wave filtering circuit and fills
Electricity circuit composition, wherein charging circuit is prior art maturation circuit, and its circuit structure no longer does narration in detail at this.
2, the design of accessory power supply
No matter it is single-chip microcomputer or the integrated chip of other electronics, wants the work of its normal table, be required for using and close
Suitable unidirectional current is its power supply, therefore, it is necessary to design while main body circuit is designed corresponding directly
Stream electricity power supply circuits.To be unidirectional current by AC conversion, at least to need through the stage such as over commutation, filtering, and, it is also contemplated that
To the stability problem of voltage, therefore must also there be suitable transforming circuit and mu balanced circuit etc..People are traditionally realizing this
Plant the circuit common name direct current regulation circuit of stably supply DC voltage and function of current.
Power supply provided by the utility model mainly has the 5V unidirectional current provided to oscillating circuit and carries to power amplifier
The 12V unidirectional current of confession.Its key component has transformator, bridge rectifier and filter circuit.First 220V exchange is accessed
Electricity, through transformer pressure-reducing, is then carried out all wave rectification by bridge rectifier, after capacitor filtering, is carried out by the direct current obtained
Voltage stabilizing (DC-DC conversion).Owing to the running voltage of oscillating circuit is 5V, and the running voltage of power amplifier is 12V.Transformator
Select the toroidal transformer of output 100W, 15V and 8V；Rectifier tube selects 3A Schottky diode IN5822；Power convert
Chip can be selected for three end scalable manostat LM317.The system block diagram of accessory power supply (as a example by positive 12V voltage stabilizing) is as shown in Figure 3.
Chip LM317 is that a use is simple, and the integrated circuit of function-stable, its major function is to rise in circuit
Effect to voltage stabilizing.The voltage output range of this chip is very extensive, the highest can reach 37V,
Minimum can reach 1.2V, output voltage enables LM317 can be competent in many circuit application scenarios the most on a large scale,
Therefore the application of LM317 is it may be said that fairly widespread, and designer drives a light carriage on a familiar road already for the various methods for designing of LM317,
It can be said that LM317 has been the chip that one piece of application is highly developed, utilize ripe chip can reach to reduce circuit risk
Effect, this is also one of the factor that this utility model selects LM317.Moreover, the peripheral circuit needed for LM317 is the most very
Simple, this can greatly simplified design difficulty undoubtedly, and also reduce the later stage and check and the difficulty of debugging circuit.
Under normal circumstances, LM317 realizes the change of its output voltage is by changing the two of its peripheral circuit external electricity
The resistance of resistance realizes, additionally, LM317 also carries various circuit and chip defencive function.As a example by positive 12V accessory power supply,
Circuit theory diagrams are as shown in Fig. 4, and taking R1 is 1K, can be calculated R2=8.6K, R2 and select 20K adjustable resistance.
3, the design of power amplifier
Power amplifier refers to export the amplifying circuit of high-power signal.The kind of amplifier is a lot, and such as conventional has
Discrete component amplifier and integrated amplifier.Regardless of being any amplifier, the final stage at circuit is required for connecing the negative of reality
Carry.The power of load consumption is the biggest under normal circumstances, because the electric current generally flowing through load is wanted with load two ends
The voltage asked is the biggest.It is to say, want to be successfully driven load, amplifier must export bigger power, therefore by this
Class A amplifier A is referred to as power amplifier.In this utility model, need also exist for using power amplifier.Due to the vibration after amplifying
Output is for energy work rate rather than signal, and wave distortion is unimportant, selects power field effect pipe circuit here.
Through comparing and screening, and considering cost factor, final choice IRF640, as power amplifier MOS device.IRF640
It is a Low ESR of IR company design production, rapidly switched tube, it is particularly suitable for applying high-frequency power amplifying circuit.Its main property
Can be as follows:
1) low on-resistance: 180 milliohms；
2) low gate voltage :+4V；
3) operating temperature :-55 to 150 degrees Celsius；
4) switching speed being exceedingly fast: open time delay 13nS, rise time 50nS, closes time delay 46nS, fall time 35nS.
Fig. 5 is the field effect transistor power amplifier figure of design, and the size of regulation CP can finely tune the resonant frequency of LC so that it is humorous
Vibration frequency, closer to the frequency of control signal, so can improve efficiency of transmission.
4, the design of oscillating circuit
This utility model uses NE555 to constitute the multivibrator of frequency-adjustable.When 555 timing IC chips are a uses
Between the most remote, range is quite varied, the timing IC chip that design is the most ripe.And NE555 is 555 timing IC
A model in chip extended familys.Compared with other timing IC chip, NE555 has the advantage of its uniqueness.Such as, NE555
Act not only as intervalometer to use, it is also possible to use as Schmidt trigger, and also be not required to other components and parts.This
Outward, when NE555 is used for exporting PWM ripple, its peripheral circuit is very simple, and the work of itself is the most sufficiently stable.NE555 can be steady
Surely exporting the square wave of below 1MHz, and dutycycle is adjustable, circuit debugging is easy, and cost is relatively low.NE555 timing IC chip is altogether
Having 8 pins, wherein 1 foot is the common of chip；2 feet are one and trigger end, when 2 foot voltages are in VCC/3 to 2VCC/3
Between time, NE555 could start its time cycle；3 feet are outfans, and in this programme, the PWM ripple signal of final output is exactly
Via 3 foot outputs；4 feet are again set ends, and its operation principle is when the level inputting this port is a low level, is
System set；5 feet are to control voltage port, and the effect of this port is the voltage being input to this port by adjustment, can adjust defeated
Go out the frequency of PWM ripple；6 feet are to reset latched port；7 feet are electric discharge ports；8 feet are then the supply ports of whole system, when
When the value of VCC is between 4.5V ~ 16V, chip could normally work.
This programme utilizes NE555 chip to export PWM ripple, thus drives the opening and closing of switch metal-oxide-semiconductor.And PWM ripple is considered as
It is numerous high level and low level mutually changes a kind of waveform formed.Thus now NE555 should not be operated in stable state and
It is to be operated in oscillatory regime.Additionally, system toggles under output high level and two states of output low level, it is to depend on
By the excitation of himself, actually a kind of circuit without stable state that system finally presents, once power on and start working, system
Just by not stopping switching exports PWM ripple two temporary stable states.Needing only to two resistance and two electric capacity, NE555 counts
Time IC chip just can constitute oscillator circuit structure.Now agitator can work by oscillating capacitance C back and forth in self-excitation
Charging and discharging realizes.Now, 2 feet and connected and with oscillating capacitance the non-low side that connects of 6 feet of NE555 are connected together,
Thus system can be made to trigger at 2/3 Vcc by the change of oscillating capacitance voltage to change back and forth with 1/3 Vcc triggering.One opens
Beginning, when system just powers on, VCC is charged to oscillating capacitance by resistance R1, and now NE555 output port is output as high electricity
Flat；When the voltage of oscillating capacitance reaches the threshold value that high level sets out, oscillating capacitance should be discharged by by resistance R2, now
NE555 output port is output as low level, the most back and forth, thus reaches the effect of vibration.In circuit of the present utility model
NE555 multivibrator schematic diagram is as shown in Figure 6；The resistance size of regulation R2 and R3 can regulate the frequency of output signal
And dutycycle.This programme takes 400KHz, the square wave of 60% dutycycle, and taking C2 is 100pF, is computed, and can obtain R2 ≈ 6K, R3
≈ 12K, can make field pipe not lead due to driving force deficiency iff the square wave drive rear class power amplifier exported with NE555
Logical, so needing to add a stage drive circuit.Control signal is amplified in the effect of drive circuit exactly so that control signal enough drives
Power MOS pipe.Therefore, drive circuit position in the entire system should be in the centre of control circuit and main circuit.This is
System uses Special high-low end driving chip IR2181 to constitute rear class power amplifier drive circuit.By two passages inside chip I R2181
Constitute.One of them passage is called low-pressure channel, and another one passage is called high-pressure channel, and the two passage is the most not
Interference, each works alone.
5, the design of coupling coil
This programme uses multilamellar hollow coil, mainly considers that being not suitable for use in the electronic products such as mobile phone has magnetic core
Coil.In view of electronic equipment internal such as the particularity of wireless charging, coupling coil mobile phones to be integrated into, this is just to coupling line
The size of circle is limited.Meanwhile, and this contradiction, in order to increase the change of magnetic flux so that more energy can
It is coupled among secondary coil, improves the area of system capacity efficiency of transmission spread loop the most as far as possible.Therefore, for this
For scheme, the best way is the SMD coupling coil using special process to make, and it is ensureing coil surface as far as possible
While Ji, reduce the thickness of coil as far as possible, enable coupling coil to fill among phone housing, save mobile phone body
Long-pending.
Owing to surface mounting type coil needs special technique just can make, from the point of view of cost-effective, the two of this programme
Set coil all uses enamel-covered wire close around forming.
First set coil parameter is:
Transmitting coil: shape is circular, a diameter of 9cm;The number of turns is 20；
Receiving coil: shape is circular, a diameter of 9cm;The number of turns is 20；
Copper wire diameter is 0.8mm, and coil height is 3cm, mode be close around；Can obtain coil inductance after tested is L=
480uH。
Second set coil parameter is:
Transmitting coil: shape is square, a size of 8cm*6cm;The number of turns is 25；
Receiving coil: shape is square, a size of 8cm*6cm;The number of turns is 25；
Copper wire diameter is 0.3mm, mode be close around；Can obtain coil inductance after tested is L=230uH.
6, circuit is received
As final wireless charging circuit design, the design receiving circuit have to be considered as lithium cell charging
Voltage stabilization limit, it is contemplated that lithium cell charging protection problem, when mainly preventing charging, electric current is excessive and overcharges,
Additionally, design must also select suitable lithium cell charging strategy.
Requirements above to be met, can use analog circuit to realize, such as by mu balanced circuit and switching tube protection circuit phase
In conjunction with, can reach in theory to design requirement.Chip microcontroller circuit protection can also be used, but the telephone circuit so done becomes
This is higher and volume is bigger.Among the miniaturized electronics such as receiving terminal circuit mobile phone to be integrated into, so circuit volume
Should be the least, circuit structure should be simple as far as possible, and circuit work should be stablized as far as possible, so compared to mould
From the point of view of intending circuit and single-chip microcomputer, utilizing special charging management chip is a more preferable selection.Currently on the market can lithium
Battery charging management chip is varied, existing cheap homemade chip, also has the external chip inlet of costliness.Generally,
General homemade chip just can meet lithium cell charging requirement, but, from the point of view of wireless charging, owing to receiving terminal receives
Energy has the biggest transmutability, and with coupling coil relative distance, the factor such as relative position has great relation, therefore receives
The dynamic range of the voltage and current of end is relatively wider, and common lithium cell charging managing chip operating voltage range exists mostly
Between 4.5V-6V, may be the most suitable for wireless charging.Through selecting and experiment, final selecting uses Dezhou instrument
The bq24002 lithium cell charging managing chip that device produces, compared with other lithium cell charging chip, maximum excellent of bq24002
Gesture is that it can stably export the charging voltage of 4.2V, and charging current can be set by designer oneself, and has 4.5V-10V
The Typical operating voltages that scope is wider, its maximum working voltage then can reach 13V, compare be adapted to carry out wireless
Punching charging, shortcoming is that price comparison is expensive, and this charging management chip circuit concrete structure is that prior art is easily done, this
In no longer describe in detail.
After tested, this utility model receiving terminal module can stably export 4.2V charging voltage, and wireless charging coverage reaches
To 2.5cm.Meanwhile, transmitter module and receiver module all additional circuits defencive functions, receiving terminal also with charging protection function, from
And ensure that the safety of circuit.Finally, receiving terminal module is integrated in the PCB version of 2.5cm*5cm, it is achieved that miniaturization
Requirement, be allowed to more meet the requirement for small-sized electronic product wireless charging.
This utility model is by by electromagnetic induction principle, and high-frequency switching technology combines with lithium cell charging technology, success
Design one and be applicable to small-power, the wireless charging circuit of lithium battery of portable type electronic product.At circuit transmission end NE555
Achieve frequency and dutycycle adjustable PWM ripple output function.At circuit receiving terminal, it is achieved that charging voltage voltage stabilizing, charging
Current adjustment function, and voltage monitoring when achieving lithium cell charging and monitoring temperature, thus avoid the occurrence of battery overvoltage
High dangerous situation is crossed with temperature.Generally speaking, the wireless charging circuit of lithium battery simple in construction designed, working stability, become
This is cheap, and has reached the requirement of miniaturization.
In present embodiment, the part of not narration in detail belongs to the known conventional means of the industry, chats the most one by one
State.Exemplified as above is only to illustration of the present utility model, is not intended that the restriction to protection domain of the present utility model,
Within the every and same or analogous design of this utility model belongs to protection domain of the present utility model.
Claims (4)
1. a wireless charging circuit of lithium battery, including emitting portion and receiving portion, wherein emitting portion is by oscillating circuit
(1), high-frequency amplifier circuit (2) and transmitting coil (3) composition；Receiving portion is by receiving coil (4), current rectifying and wave filtering circuit (5)
And charging circuit (6) composition；Described oscillating circuit (1) electrically connects with high-frequency amplifier circuit (2), high-frequency amplifier circuit (2) with
Transmitting coil (3) electrically connects；Receiving coil (4) electrically connects with current rectifying and wave filtering circuit (5), current rectifying and wave filtering circuit (5) and charged electrical
Road (6) electrically connects；Transmitting coil (3) and receiving coil (4) are a pair coupling coil, and they realize by the way of electromagnetic induction
The transmission of electric energy and reception, it is characterised in that: described high-frequency amplifier circuit (2) connects has the direct current to its offer running voltage steady
Volt circuit, this direct current regulation circuit includes transformator, bridge rectifier, filter circuit and LM317 voltage stabilizing chip, wherein,
The input of transformator connects 220V alternating current, and the outfan of transformator electrically connects with the input of bridge rectifier, bridge-type
The outfan of rectification circuit electrically connects with the input of filter circuit, and the outfan of filter circuit is electrically connected with LM317 voltage stabilizing chip
Connect, the DC voltage needed for LM317 voltage stabilizing chip output high-frequency amplifier circuit (2)；
Described high-frequency amplifier circuit (2) uses field effect transistor power amplifier, and its field effect transistor is enhancement mode N-MOS field effect transistor,
The grid G connection control signal of this field effect transistor, its source S ground connection, and it is connected Zener diode between source S with drain D, surely
The anode of pressure diode is connected with source S；The drain D of field effect transistor connects one end of electric capacity C, and the other end of electric capacity C connects
The unidirectional current pressure side of LM317 voltage stabilizing chip output, the two ends of electric capacity C are parallel with tunable capacitor Cp and inductance L respectively；
Described oscillating circuit (1) uses NE555 timing IC chip to constitute the multi-resonant oscillating circuit of frequency-adjustable；
The transmitting coil (3) of composition coupling coil uses multilamellar hollow coil with receiving coil (4).
2. a kind of wireless charging circuit of lithium battery as claimed in claim 1, it is characterised in that described LM317 voltage stabilizing chip is defeated
DC voltage needed for the high-frequency amplifier circuit (2) gone out is 12V DC voltage.
3. a kind of wireless charging circuit of lithium battery as claimed in claim 1, it is characterised in that described multilamellar hollow coil is concrete
Using SMD coupling coil, the shape of its transmitting coil (3) is circular, a diameter of 9cm;The number of turns is 20；Receiving coil
(4) shape is circular, a diameter of 9cm;The number of turns is 20；Copper wire diameter is 0.8mm, and coil height is 3cm, coil around
Line mode be close around；Coil inductance is L=480uH.
4. a kind of wireless charging circuit of lithium battery as claimed in claim 1, it is characterised in that described oscillating circuit (1) uses
NE555 timing IC chip constitutes the multi-resonant oscillating circuit of frequency-adjustable, the GND foot ground connection of its NE555 timing IC chip, GND foot
I.e. 1 foot, this 1 foot is also respectively connected with one end of electric capacity C1 and C2, and wherein the other end and 5 feet of electric capacity C1 connect, the other end of C2
Being simultaneously connected with 2 feet and 6 feet and one end of resistance R1, the other end of resistance R1 is connected with adjustable resistance R2, adjustable resistance R2's
The other end is connected with 7 feet of NE555 timing IC chip and one end of R4, and the other end of R4 connects with one end of adjustable resistance R3
Connecing, the other end of adjustable resistance R3 and 8 feet connect and are connected simultaneously to 4 feet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620743011.3U CN205882804U (en) | 2016-07-15 | 2016-07-15 | Wireless charging circuit of lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620743011.3U CN205882804U (en) | 2016-07-15 | 2016-07-15 | Wireless charging circuit of lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205882804U true CN205882804U (en) | 2017-01-11 |
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ID=57695763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620743011.3U Expired - Fee Related CN205882804U (en) | 2016-07-15 | 2016-07-15 | Wireless charging circuit of lithium cell |
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| Country | Link |
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| CN (1) | CN205882804U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086619A (en) * | 2017-04-28 | 2017-08-22 | 昆明理工大学 | A kind of wireless charging ball |
| CN109211004A (en) * | 2017-07-07 | 2019-01-15 | 杨俊峰 | Baton set with wireless charging function |
| CN109818398A (en) * | 2017-11-18 | 2019-05-28 | 长沙鲁维湘机电科技有限公司 | A kind of wireless charger using NE555 |
-
2016
- 2016-07-15 CN CN201620743011.3U patent/CN205882804U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107086619A (en) * | 2017-04-28 | 2017-08-22 | 昆明理工大学 | A kind of wireless charging ball |
| CN109211004A (en) * | 2017-07-07 | 2019-01-15 | 杨俊峰 | Baton set with wireless charging function |
| CN109818398A (en) * | 2017-11-18 | 2019-05-28 | 长沙鲁维湘机电科技有限公司 | A kind of wireless charger using NE555 |
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170111 Termination date: 20170715 |
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| CF01 | Termination of patent right due to non-payment of annual fee |