CN104283333A - Self-adaption wireless energy supply adjusting system for percutaneous energy transmitting system - Google Patents
Self-adaption wireless energy supply adjusting system for percutaneous energy transmitting system Download PDFInfo
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Abstract
The invention discloses a self-adaption wireless energy supply adjusting system for a percutaneous energy transmitting system. The self-adaption wireless energy supply adjusting system comprises an in-vitro energy emitting device and an in-vivo energy receiving device. The in-vitro energy emitting device and the in-vivo energy receiving device are coupled in an electromagnetic induction mode. The in-vivo energy receiving device is connected with a load to provide electric energy. The in-vitro energy emitting device inverts the direct-current power supply voltage into alternating-current power supply voltage so as to drive an LC resonance circuit to generate an alternating magnetic field. The in-vivo energy receiving device generates electricity through receiving coil induction and outputs power supply voltage meeting the requirements through rectifying, filtering and voltage stabilizing so as to drive the load. By means of the self-adaption wireless energy supply adjusting system, the fluctuation, caused by changes of positions of energy coils or distances between the energy coils, of the voltage at an in-vivo receiving end is eliminated, the emitting power is automatically adjusted, the voltage at the in-vivo receiving end is kept constant, the functions of adjusting the emitting power and keeping the in-vivo voltage constant are achieved, the normality and stability of an in-vivo electronic device are ensured, and the whole percutaneous energy supply system is made safer and more convenient to use.
Description
Technical field
The present invention relates to a kind of wireless energy transform device, specifically a kind of power output being applied to implanted electronic medical equipment can self adaptation regulation and control through skin energy supply regulating system.
Background technology
Implanted electromedical equipment, as artificial anal sphincter, GI irritation device, cardiac pacemaker and nerve stimulator etc., play more and more important role, and obtain clinical practice widely in the various lysis for the treatment of.But Power supply problem is the said equipment " bottleneck " always, initial in vitro towing line type supply power mode is eliminated because of its postoperative high infection rate and complication, powers also cannot be used widely because the volume large life-span is short for large power consumption implanted device conventional batteries.Along with transdermal power transmission (transcutaneous energy transfer, TET) technology development, become the optimal selection of this kind equipment based on TET energy supply, its fail safe and convenience self-evident.
Through finding the literature search of prior art, the status requirement of traditional transdermal power to vivo and vitro energy coil is very strict, and the otherness of the proper motion of user or Different Individual transplanting place fat-muscle physiological structure can make inevitable relative displacement (axially, radial and angle) occurs between coil, thus directly cause the change of stiffness of coupling between coil, system transport capacity sharply changes, in body, receiver voltage is either large or small, badly influences the normal work of electronic system in body.So traditional TET energy supply usually can require relatively strict coil to put scope or adopt the alignment of magnet indirect guide body inside and outside coil to fix; Also sacrifice volume by array of designs formula transmitting coil and increase effective contact range.But not strong through skin energy supply said method operability for implanted, limit flexibility and the convenience of its application undoubtedly.In addition, also by the output valve of voltage in radio communication Real-time Obtaining body, transmitting terminal adopts certain regulatory mechanism compensated position to change the change of the coupling factor caused in vitro, in maintenance body, receiver voltage is relatively stable, but extra wireless communication module and peripheral circuit add complexity and the cost of system undoubtedly, its response speed regulated can not ensure.
Summary of the invention
The present invention is directed to prior art above shortcomings, propose a kind of adaptive wireless energy supply regulating system for transdermal power transmission system, solve the inconvenience that traditional TET system capacity coil need fix relative position, use safer, stable.
In order to solve the problems of the technologies described above, adopt following technical proposal:
For an adaptive wireless energy supply regulating system for transdermal power transmission system, comprise external energy emitting device and energy i (in vivo) receiving system; Be coupled by way of electromagnetic induction between described external energy emitting device and energy i (in vivo) receiving system, described energy i (in vivo) receiving system connects load to provide electric energy, wherein, the inversion of direct current supply voltage is interchange by described external energy emitting device, drive LC resonant tank, produce alternating magnetic field; Described energy i (in vivo) receiving system, by receiving coil influence electricity, exports the supply power voltage met the demands through over commutation, filtering and voltage stabilizing, drive load.
The described adaptive wireless energy supply regulating system for transdermal power transmission system, wherein, described external energy emitting device comprises power governor, reflector and energy transmitting coil; Power governor produces input signal, and signal, for driving reflector, is transferred to energy i (in vivo) receiving system by energy transmitting coil by input signal;
Described energy i (in vivo) receiving system comprises energy acceptance coil and receiver, and described receiver comprises the second resonant matching circuit and rectification filtering voltage stabilizing circuit; Second resonant matching circuit and receiving coil form resonant tank jointly, with compensating reactance loss; The signal of reception is carried out rectification, filtering and voltage stabilizing process and forms galvanic current pressure by rectification filtering voltage stabilizing circuit, is supplied to load;
The described adaptive wireless energy supply regulating system for transdermal power transmission system, described reflector comprises energy inverter circuit and resonant matching circuit, inverter circuit changes direct current energy into alternating current and is supplied to resonant matching circuit, and described resonant matching circuit matches for wireless transmission electric power with described energy transmitting coil.
The described adaptive wireless energy supply regulating system for transdermal power transmission system, wherein, power governor comprises signal processing circuit, signal drive circuit and phase detecting circuit, and the signal that phase detecting circuit exports is via signal processing circuit process input signal drive circuit.
The described adaptive wireless energy supply regulating system for transdermal power transmission system, wherein, energy transmitting coil comprises substrate, magnetic boss; Described magnetic boss is fixed on described substrate, is positioned on described substrate center line, and described magnetic boss periphery is circumferentially wound with multi-layer helical coil and forms coil groups, the diameter of described coil groups and the equal diameters of described substrate.
The described adaptive wireless energy supply regulating system for transdermal power transmission system, wherein, described helical coil comprises multiply enamel covered wire, and enamel covered wire described in multiply is stranded to be formed.
According to a second aspect of the invention, based on foregoing invention content, the self adaptation regulate and control method of proposition comprises:
Set external transmitting terminal initialization frequency (f
0) as first condition.
Setting transmitting and receiving coil inductance L and tuning capacitance value C forms second condition, and wherein coil inductance is coil inductance measured value designed in practical application, and tuning capacitance size selection principle is C=(2 π f)
2/ L, damage circuit in order to loop current when preventing the complete resonance in LC loop is excessive, and ensure zero voltage switch (ZVS) inversion, in formula, f should be slightly less than f
0.
In setting body, receiver voltage expects regulated value (V
0) as Article 3 part.
In embodiments, the actual range scope between setting coil, in most weak coupling because of (ultimate range) under subcase, regulates transmitting terminal supply power voltage (V
s), make receiver voltage in body reach fixed transmission end supply power voltage after desired output, obtain expecting voltage transmission ratio of gains G=V
0/ V
s.
In embodiments, between phase difference feedback signal and coil, coupling factor variation relation is derived by system mathematic model.
In embodiments, voltage transmission equation is derived by the T-shaped simplified model of wireless energy transfer circuit and goes out.
In embodiments, by solving voltage transmission equation, the relation equation of tranmitting frequency about coupling factor and voltage transmission gain can be obtained, i.e. frequency control equations.
Beneficial effect of the present invention:
The present invention is based on the load voltage current signal phase difference of resonant tank in external reflector, without the need to setting up wireless communication loop, indirectly reflecting that coil position changes the change of the coupling factor caused relatively with the form of Mathematical Modeling; And by designed tranmitting frequency control law, regulate tranmitting frequency to maintain the constant of output voltage in body, the solution performance of phase feedback FREQUENCY CONTROL is sane and efficient, make that whole system is more compatible, stable, safety and hommization.
Accompanying drawing explanation
With reference to accompanying drawing, by means of only example, the present invention is described herein.Now about concrete the quoting to drawings in detail, emphasize: shown details is by example, is only illustrated for the object of the illustrative discussion to the preferred embodiment for the present invention, and the presenting to propose to be considered to the most useful and the description of understandable, the principle of the invention and concept aspect of these details.Based on this theory, do not attempt exceeding desirably CONSTRUCTED SPECIFICATION of the present invention being shown in more detail to basic comprehension of the present invention, how effective in practice the explanation with figure makes to understand forms more of the present invention with those skilled in the art know that is.
Fig. 1 is the simplified block diagram of adaptive wireless energy supply regulating system.
Fig. 2 is the rough schematic view of adaptive wireless energy supply regulating system.
Fig. 3 is the rough schematic view of body internal burden application in one exemplary embodiment.
Fig. 4 illustrates the structure chart for the energy coil in one exemplary embodiment of the present invention.
Fig. 5 is the simplified block diagram of the phase detecting circuit according to one exemplary embodiment of the present invention.
Fig. 6 shows adaptive wireless energy supply regulating system circuit reduction model.
Fig. 7 illustrates the simulation relation curve of the phase difference of the function as coupling factor.
Fig. 8 is the T-shaped circuit model of adaptive wireless energy supply regulating system transmission link.
Fig. 9 is analog result, and wherein, voltage transmission gain is drawn as the function of coupling factor according to the embodiment of the present invention.
Figure 10 is the FREQUENCY CONTROL matched curve as coupling factor;
Figure 11 is the flow chart of the method illustrated according to one exemplary embodiment of the present invention.
Embodiment
Unless otherwise defined, all technology used herein and scientific terminology have the identical implication of understanding common with those skilled in the art of the invention.Material provided herein, method and example are only exemplary and do not mean that and limit to some extent.
Word used herein " example " means " as example, example or illustration ".Any " example " execution mode that is described to need not be interpreted as being incorporated to of feature that be more preferred than other execution modes or favourable and/or that need not get rid of from other execution modes.
Word used herein " alternatively " means " be provided in some embodiments and be not provided in other embodiments ".Any embodiment of the present invention can comprise multiple " optionally " feature, unless these features are conflicted mutually.
The method of embodiments of the present invention and/or the implementation of system can comprise manual, automatically or in combination carry out or complete selected task.The task of setting input voltage, receiver voltage, coil inductance and resonance capacitance is specifically comprised at this.
Those skilled in the art will understand further, and the various illustrative components, blocks, module, circuit and the algorithm steps that describe in conjunction with one exemplary embodiment disclosed herein can be embodied as electronic hardware, computer software or both combinations.For clearly demonstrating this interchangeability of hardware and software, roughly functional about it above and describe various Illustrative components, block, module, circuit and step.Functionally hardware is embodied as or software depends on application-specific and forces at the design constraint of whole system by described.Those skilled in the art can implement described functional by different way for each application-specific, but described implementation decision should not be interpreted as the scope that causes departing from one exemplary embodiment of the present invention.
The various illustrative components, blocks, module and the circuit that describe in conjunction with one exemplary embodiment as herein described can be implemented with the general purpose signal processor performing function as herein described, digital signal processor (DSP), application-specific integrated circuit (ASIC) (ASIC), field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components or its any combination or perform with through designing.General processor can be microprocessor, but in replacement scheme, and processor can be the processor of any routine, controller, microcontroller or state machine.Processor also can be embodied as the combination of calculation element, and such as, the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessors are combined with DSP core, or any other this configuration.
The method described in conjunction with one exemplary embodiment disclosed herein or the step of algorithm can directly be embodied in the software module performed in hardware, by processor, or in both combinations.Software module can reside on random access memory (RAM), flash memory, read-only memory (ROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM), register, hard disk, can load and unload dish, CD-ROM, or in the medium of other form any known in technique.Exemplary storage medium is coupled to processor, makes processor from read information, and can write information to medium.In replacement scheme, medium can formula integral with processor.Processor and medium can reside in ASIC.ASIC can resident in the user terminal.In replacement scheme, processor and medium can be used as discrete component resident in the user terminal.
Term " wireless energy supply " is transmitted into the electric field of receiver, magnetic field, electromagnetic field or other any type of energy that be associated with when not using physics electric conductor from reflector in order to represent in this article.Thereafter, when understanding pure magnetic field or pure electric field does not launch electric power, these three kinds of fields all will be generally referred to herein as radiation field.These must be coupled to " receiving coil " to realize electric power transmission.
As shown in Figure 1, input electric power 100 is provided to external energy emitting device 101 by the present invention, to produce the field 104 for providing Energy Transfer.Energy i (in vivo) receiving system 105 coupling shows up 104, and produces output power 110, for storing for the load 107 of being coupled to output power 110 or consume.Separate a distance 108 between external energy emitting device 101 with energy i (in vivo) receiving system 105 due to hypodermis, fat and muscle, in actual application, the size of this distance 108 can change along with the limb activity of patient.
External energy emitting device 101 comprises further: power governor 102, reflector 103 and energy transmitting coil 208, power governor 102 produces the input signal 109 that can be used for driving reflector 103, the device regulated is launched for being provided for energy, and energy i (in vivo) receiving system 105 comprises energy acceptance coil 209 further, for being provided for the device of energy acceptance.Transmitting and receiving coil is according to treating that application associated therewith and device carry out sizing.Note, according to one exemplary embodiment of the present invention, single assembly (such as, implantable medical devices) can comprise: receiver (such as, receiver 106), and it is configured to from another wireless launcher wireless receiving electric power; And reflector (such as, reflector 103), it is for by electric power wireless transmission auto levelizer.
In an exemplary embodiment, reflector 103 and receiver 106 configure according to mutual resonant relationship, and when the resonance frequency of receiver 106 and reflector 103 resonance frequency closely time, it is minimum that the transmitting between reflector 103 and receiver 106 is lost in when receiver 106 is arranged in " near field " of field 104.
As shown in Figure 2, reflector 103 comprises inverter circuit 202 and resonant matching circuit 204.Power governor 102 comprises signal processing circuit 200, signal drive circuit 201 and phase detecting circuit 203.The d. c. voltage signal inputted by signal drive circuit 201 is transformed into sinusoidal ac signal by inverter circuit 202, to drive transmitting coil 208 to produce alternating electromagnetic field, for providing the coupled electricity-generation of receiving coil 209.Inverter circuit 202 can adopt full-bridge inverting, semi-bridge inversion, E level topology amplification driving circuit or E level topology amplification driving circuit to realize, but is not limited to this.Reflector 103 causes the oscillator signal of the near-field energy produced around transmitting coil 208 that AC electric power is supplied to transmitting coil 208 by providing.Note, reflector 103 can operate under any suitable frequency.As an example, reflector 103 can operate under the ISM frequency band of 256kHz.Resonant matching circuit 204 adopts capacitance compensation transmitting coil 208 loss, and common formation series, parallel or series parallel resonance circuit, improve energy emission effciency, tuning capacitance size selection principle is C=(2 π f)
2/ L, wherein f is drive singal 210 frequency, and L is transmitting coil 208 inductance.Reflector 103 can be made up of discrete device or circuit, or can be made up of integrated assemblies.The exemplary AC electric power exported from transmitting coil 208 can be less than 1W or be approximately tens watts, and this depends on application.Signal processing circuit 200 mainly realizes two large functions, and one is output signal collection analysis to phase detecting circuit 203, acquisition phase testing circuit 203 output voltage signal, and current sensor can be used to gather load current signal, as ring current transformer; According to Automatic adjusument rule, adjustment drive singal 210 frequency size in real time; Two is produce satisfactory drive singal 210 (such as the pwm signal in single channel or two-way band dead band).AD conversion is carried out to the output valve of phase feedback circuit, with this value for foundation, according to frequency control algorithm adjustment inverter circuit PWM driving signal frequency.Drive singal 210 also can be produced by special adjustable signal generator chip, or directly uses the controller of built-in waveform generator to realize.Signal drive circuit 201 plays electrical isolation effect, digital circuit (such as signal processing circuit 200) and analog circuit (such as inverter circuit 202) are effectively isolated, the drive singal 210 exported is controlled after isolation is amplified the operating state of each switch of follow-up inverter circuit by signal processing circuit 200.
Receiver 106 comprises resonant matching circuit 205 and rectification filtering voltage stabilizing circuit 206.Resonant matching circuit 205 and receiving coil 209 form resonant tank (such as series, parallel or series parallel resonance circuit) jointly, and compensating reactance loss improves receiving efficiency, and tuning capacitance selection principle is identical with transmitting resonant capacitance.Rectification filtering voltage stabilizing circuit 206 is custom circuit.In the present embodiment, receiving terminal mode of resonance and transmitting terminal mode of resonance form four kinds of patterns jointly, i.e. imbalance in imbalance in external resonant body interior resonance, external resonant body, external imbalance body interior resonance and external imbalance body.In vitro when resonant body interior resonance, efficiency of transmission is best.The receiving coil 209 be under alternating electromagnetism field action produces induced electromotive force, compensate after amplification through resonant matching circuit 205, the induced current input rectifying produced, filtering and Voltage stabilizing module 206 carry out process and form galvanic current pressure, as the Power supply being supplied to the load 107 that implants.Rectification, filtering and Voltage stabilizing module 206 comprise AC to DC transducer, and also can comprise DC to DC transducer.The AC energy signal rectification that receiving coil 209 place receives by AC to DC transducer is non-alternating electric power, and the AC energy signal through rectification is converted to and the energy current potential of load 107 compatibility (such as, voltage) by DC to DC transducer.Expect and comprise part and complete rectifier, adjuster, bridger, frequency multiplier and linear and switching converter by various AC to DC transducer.
As shown in Figure 3, load 107 comprises charging device 300, energy storing device 301 (such as battery) and electronic application device 302 further.Charging device 300 can comprise any known and suitable rechargeable device.According to an example, electronic application device 302 can comprise embedded equipment, such as medical treatment device, transducer or its combination.Only for example, application load 302 can comprise transducer, and it is configured for use in embedding (such as, implant, take in, attachment) in (only such as) live body (such as, the mankind) or other structure or above.According to an one exemplary embodiment, electronic application device 302 can be configured to the beacon signal of launching power state stored by instruction energy storing device 301.Load 107 can not comprise charging device 300 and energy storing device 301, has the direct voltage arranging filter regulator circuit 206 output can directly supply electronic application device 302.When comprising charging device 300, according to an embodiment, it can simultaneously load energy storage device 301 and electronic application device 302, plays electrical isolation effect on the one hand; Can ensureing on the other hand when charging, effective distribution of operating current, under meeting the prerequisite of the energy requirement that electronic application device 302 normally works, ensureing the charging to energy storing device 301.
As shown in Figure 4, energy transmitting coil 208 comprises substrate 400, magnetic boss 401; The magnet ring that substrate 400 processes for Ferrite Material, described magnetic boss is fixed on described substrate, be positioned on described substrate center line, described magnetic boss periphery is circumferentially wound with multi-layer helical coil and forms coil groups (being namely wound in the two dimensional surface multi-layer helical coil 402 on ferrite bead), the diameter of described coil groups and the equal diameters of described substrate.
Described transmitting coil 208 is made up of as substrate, magnetic boss 401, the two dimensional surface multi-layer helical coil 402 be wound on ferrite bead ferrite bead 400.Described helical coil comprises multiply enamel covered wire, and enamel covered wire described in multiply is stranded to be formed, and every circle enamel covered wire can be made up of the single Litz line of the different wire diameter of different number of share of stock.Single layer coil is according to the diameter of central magnetic boss 401 successively outward around system, and till magnet ring external diameter, lattice coil is then that single layer coil adds up according to series system lamination.Receiving coil 209 structure and transmitting coil 208 similar.Tuning receiving coil 209 is with at the frequency identical with transmitting coil 208 or designated frequency range interior resonance.Receiving coil 209 can with transmitting coil 208 sizing similarly, the external diameter of substrate 300, internal diameter and thickness; The diameter of magnetic boss 401 and gauge; And the coil number of plies is not unique, can arrange as the case may be.In the present embodiment, coil dimension recommended value: external coil outer diameter is 60mm, thick 5m, the thick 3mm of magnetic boss diameter 8mm; Body interior loop external diameter 35mm, thick 1mm, magnetic boss diameter 5mm, thick 1mm; The coil number of plies is 3 layers.Ferrite Material is selected in the material suggestion of described substrate 400 and magnetic boss 401, but is not limited to this, and selection principle is the linear magnetic material of high magnetic permeability low conductivity.Coil litz used twisted wire is woven by the single litz line of the different wire diameters of multiply and forms, and its wire diameter selection principle is as follows:
wherein: d is sub-thread litz line wire diameter, and δ is skin depth, and ω is operating frequency, μ
0for permeability of vacuum, μ
rfor magnetic material relative permeability, σ is magnetic material conductivity.
As shown in Figure 5, phase detectors 203 comprise signal conversion circuit 502, phase discriminator 503, filter circuit 504 and amplifier 505.The ac current signal 500 of resonant tank converts the square-wave signal of same homophase frequently to through transducer (such as ring current transformer) collection to signal conversion circuit 502 input, together input phase discriminator 503 with inverter circuit square wave driving signal 501 and carry out phase compare, it exports through low pass filter 504, reduces interference.Again by amplifying circuit by this signal madulation to a proper level input signal processor 200.Each circuit all can be made up of discrete device or circuit above, or can be made up of integrated assemblies.
According to a further aspect in the invention, Fig. 6 shows adaptive wireless energy supply regulating system circuit reduction model, and resonance matching structure is series connection in external concatermer.Wherein, transmitting coil 208 and receiving coil 209 inductance are expressed as L
1, L
2, its equivalent series resistance is R
1, R
2, between coil, mutual inductance is M, tuning capacitance C
1, C
2, R
eqfor secondary equivalent AC load, emitting voltage is U
1, angle of departure frequency is ω.Because equivalent series resistance is R
p, R
srelatively little, can ignore not in analytic process.Then external reflector 101 equivalent input impedance can be expressed as: equation 1
Wherein Z
srfor secondary loop in body 105 reflected umpedance, can be expressed as:
Equation 2
Between coil, coupling factor k can be expressed as by mutual inductance M:
Equation 3
By equation 1 and equation 2, external reflector 101 equivalent input impedance Z
1can be expressed as:
Equation 4
External LC resonant tank load current and inversion drive voltage signal phase difference can be expressed as:
Equation 5
Equation 6
The function expression of coupling factor about phase difference can be tried to achieve by equation 5:
Equation 7
When patient uses external energy emitter 101 to when transplanting electromedical equipment in body for (filling) electricity, transmitting coil 208 is affixed on skin surface, align with subcutaneous receiving coil 209 as far as possible and place, but in actual application, due to hypodermic compliance, there is deviation in the relative position between coil, add that normal limb activity will certainly cause, between coil, relative displacement occurs, thus directly affect the worth change of k, and k and coil distance are inversely proportional to, thus cause the instability of receiver voltage in body.To be monitored the otherness of external signal characteristic by equation 7 and just brief introduction can grasp the variation tendency of k, therefore equation 7 can be used as the feedback signal function of adaptive power adjustment.Show in following table and transmitting power can be regulated to maintain the instance parameter stablizing transmitting coil 208 and receiving coil 209 in receiver voltage system by changing tranmitting frequency, and matching capacitance parameter.
| Parameter | Numerical value |
| L 1 | 37.05μH |
| C 1 | 10.408nF |
| R 1 | 0.83Ω |
| L 2 | 32.92μH |
| C 2 | 11.788nF |
| R 2 | 0.65Ω |
| f R | 256KHz |
Table 1: the system example of self adaptation coil relative position change
Fig. 7 illustrates the simulation relation curve of the phase difference of the function as coupling factor; As can be seen from the figure when k value is from 0.1 changing value 0.28, phase difference is reduced to 10 degree by 55 degree, if from axial distance angle changing, illustrate that the change along with coil-span is large, the impact of energy i (in vivo) receiving system 105 on external energy emitting device 101 is more and more less.
Fig. 8 is that adaptive wireless energy supply regulating system transmission link is simplified to T-shaped circuit model further on the equivalent model basis shown in Fig. 6.
Voltage transmission gain function can be derived by Fig. 8:
Equation 8
Wherein:
Equation 9
Equation 10
Equation 11
Equation 12
Equation 13
Equation 14
By equation 9 ~ equation 14, equation 8 can rearrange and be expressed as:
Equation 15
Fig. 9 shows analog result, and wherein, according to embodiments of the invention, under four kinds of different coupling factor conditions, voltage transmission gain is drawn as the function of tranmitting frequency.As can be seen from Figure to different k values, voltage transmission gain curve is different, and change in gain rate is worth reducing along with k and increases.In the present embodiment, supply power voltage is 9V, and in body, receiver voltage is set as 7V, then transmission gain is 0.78.Constant in order to maintain receiver voltage, for different k values, adjustment tranmitting frequency can make working point all the time at G
von=0.78.Shown in figure, for the scope 0.12 ~ 0.42 of k, tranmitting frequency adjusting range is 272kHz ~ 321kHz.
There is the voltage transmission gain function that equation 15 describes, worked as gain G
vtime fixing, the mode by numerical fitting derives the FREQUENCY CONTROL curve about coupling factor, and Figure 10 shows the FREQUENCY CONTROL matched curve as coupling factor, and fitting expression is:
Equation 16
Figure 11 is the flow chart of the method illustrated according to one exemplary embodiment of the present invention.When phase detecting circuit 203 detects that phase place changes, changed by the process of hardware circuit and converted to corresponding magnitude of voltage, input signal processor 200.The 600 pairs of input signal digitlizations of the built-in AD sample circuit of signal processor 200, the adaptive power regulation strategy arranged according to the present invention, adjustment tranmitting frequency, produces drive singal 210 by built-in PWM generator 601, thus completes the work of self adaptation voltage stabilizing.AD sample circuit 600 and PWM generator 601 also can be made up of external discrete device or circuit, or can be made up of integrated assemblies.Whole process is without the need to human intervention, and without the need to setting up wireless communication link, fully ensure the real-time of regulation and control, the regulate and control method that can be used as a kind of Efficient robust is applied in transdermal power transmission system.
Claims (6)
1., for an adaptive wireless energy supply regulating system for transdermal power transmission system, comprise external energy emitting device and energy i (in vivo) receiving system; Be coupled by way of electromagnetic induction between described external energy emitting device and energy i (in vivo) receiving system, described energy i (in vivo) receiving system connects load to provide electric energy, it is characterized in that, the inversion of direct current supply voltage is interchange by described external energy emitting device, drive LC resonant tank, produce alternating magnetic field; Described energy i (in vivo) receiving system, by receiving coil influence electricity, exports the supply power voltage met the demands through over commutation, filtering and voltage stabilizing, drive load.
2. the adaptive wireless energy supply regulating system for transdermal power transmission system according to claim 1, it is characterized in that, described external energy emitting device comprises power governor, reflector and energy transmitting coil; Power governor produces input signal, and signal, for driving reflector, is transferred to energy i (in vivo) receiving system by energy transmitting coil by input signal;
Described energy i (in vivo) receiving system comprises energy acceptance coil and receiver, and described receiver comprises the second resonant matching circuit and rectification, filtering, voltage stabilizing circuit; Second resonant matching circuit and receiving coil form resonant tank jointly, with compensating reactance loss; The signal of reception is carried out rectification, filtering and voltage stabilizing process and forms galvanic current pressure by rectification filtering voltage stabilizing circuit, is supplied to load.
3. the adaptive wireless energy supply regulating system for transdermal power transmission system according to claim 2, it is characterized in that, described reflector comprises energy inverter circuit and resonant matching circuit, inverter circuit changes direct current energy into alternating current and is supplied to resonant matching circuit, and described resonant matching circuit matches for wireless transmission electric power with described energy transmitting coil.
4. the adaptive wireless energy supply regulating system for transdermal power transmission system according to claim 2,3, it is characterized in that, power governor comprises signal processing circuit, signal drive circuit and phase detecting circuit, and the signal that phase detecting circuit exports is via signal processing circuit process input signal drive circuit.
5. the adaptive wireless energy supply regulating system for transdermal power transmission system according to claim 2, it is characterized in that, energy transmitting coil comprises substrate, magnetic boss; Described magnetic boss is fixed on described substrate, is positioned on described substrate center line, and described magnetic boss periphery is circumferentially wound with multi-layer helical coil and forms coil groups, the diameter of described coil groups and the equal diameters of described substrate.
6., as claimed in claim 3 for the adaptive wireless energy supply regulating system of transdermal power transmission system, it is characterized in that, described helical coil comprises multiply enamel covered wire, and enamel covered wire described in multiply is stranded to be formed.
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