CN104682576A - Resonance wireless power transmission system added with adaptive double-end impendence conversion networks - Google Patents
Resonance wireless power transmission system added with adaptive double-end impendence conversion networks Download PDFInfo
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Abstract
The invention provides a resonance wireless power transmission system added with adaptive double-end impendence conversion networks. The system comprises a high-frequency power source module, a primary impedance conversion network module, a secondary impedance conversion network module, a transmission coil module, a load module and an impendence conversion controller, wherein the transmission coil module comprises a transmitting coil and a receiving coil; the primary impedance conversion network module is respectively connected with the high-frequency power source module and the transmitting coil; the secondary impedance conversion network module is respectively connected with the receiving coil and the load module; the impendence conversion controller receives signals from a mutual inductance detector and a load detector, sends corresponding commands to a primary impedance conversion network and a secondary impedance conversion network through internal processing, and adjusts relevant parameters of the networks, thereby realizing optimal system performance. By adding adaptive impendence conversion networks on the primary side and the secondary side of the resonance wireless power transmission system, the system can automatically realize that a high-frequency power source outputs maximum power, and obtains the maximum transmission efficiency.
Description
Technical field
The present invention relates to a kind of resonance type wireless electric energy transmission system, particularly relate to a kind of resonance type wireless electric energy transmission system adding self adaptation both-end impedance transformer network.
Background technology
Signal or electric energy, in transmitting procedure, in order to realize areflexia transmission or the maximum power transfer of signal, require that circuit can realize impedance matching.Impedance matching concerns the performance of system, and circuit realiration impedance matching can make the performance of system reach optimum.
Usually the object realizing impedance matching has two: one to be reflected wave between erasure signal source (or power supply) and load, and ensure the transmission quality of signal transmission, this impedance matching is called that areflexia is mated; Two is make power supply (or signal source) Maximum Power Output, and this impedance matching is called that peak power output is mated.A kind of suitable impedance transformer network that this patent designs mainly for the second situation, thus realize the maximum power output of high frequency power source.
Secondly, resonance type wireless electric energy transmission technology has the features such as long transmission distance, efficiency of transmission are relatively high, non-radiation type, is particularly suitable for the wireless power transmission of moderate distance.Its chief component is transmission coil and load, and transmission coil generally reaches resonance condition by self-resonance or external capacitor, thus realizes effective transmission of electric energy.But in actual applications, transmission coil is not desirable coil, consider its internal resistance, and the relative position change in addition between transmission coil can cause mutual inductance to change; Load resistance is neither be the bigger the better neither be the smaller the better, and it exists an optimum value and makes system transfers efficiency maximum.When load resistance be not optimum value or load variations time, it can be made to be equivalent to optimum value by adding suitable impedance transformer network, thus realize the object that all can to obtain maximum power to arbitrary load resistance.
Summary of the invention
The object of the invention is to overcome output power of power supply in current resonance type wireless electric energy transmission system not high, the problem of system transfers inefficiency.By adding suitable impedance transformer network respectively at transmitting coil and receiving coil both sides, and by means of the effect of impedance transformation controller, can ensure high frequency power source module Maximum Power Output in real time, and external transmission is most effective, thus makes load obtain maximum power.
The present invention is achieved through the following technical solutions.
Add the resonance type wireless electric energy transmission system of self adaptation both-end impedance transformer network, comprise high frequency power source module, transmission coil module, load blocks, impedance transformation controller, primary impedance converting network, secondary impedance converting network; Wherein high frequency power source module is composed in series by ideal voltage source and internal resistance, for system provides electric energy; Transmission coil module comprises transmitting coil, receiving coil, mutual inductance detector, wherein transmitting coil is equivalent to the RLC series resonance mode formed by transmitting coil internal resistance, transmitting coil inductance and transmitting coil resonant capacitance, and receiving coil is equivalent to the RLC series resonance mode formed by receiving coil internal resistance, receiving coil inductance and receiving coil resonant capacitance; The input of primary impedance converting network is connected with the output of high frequency power source, and output is connected with the transmitting coil TX in transmission coil module; Load blocks is made up of load and load sensor; Impedance transformation controller is by receiving the first input signal of self-mutual inductance detector and the second input signal of load sensor, through internal data process, send the first control signal and the second control signal to secondary impedance converting network and primary impedance converting network, and then regulate their Inside Parameter Value; The input of secondary impedance matching network is connected with the receiving coil in transmission coil module, and its output is connected with load, by receiving the parameter value regulating self from the first control signal of impedance transformation controller; The input of primary impedance converting network is connected with the output of high frequency power source module, and its output is connected with the transmitting coil in transmission coil module, by receiving the parameter value regulating self from the second control signal of impedance transformation controller.
Further, according to Thevenin's theorem and Norton theorem, high frequency power source module can be equivalent to an ideal voltage source U
swith equivalent source internal resistance R
sseries connection, also can be equivalent to an ideal current source I
swith equivalent source internal resistance R
sparallel form, both meet U
s=R
si
srelation, the equivalent resistance when high frequency power source outside is R
eq, and R
eq=R
stime, high frequency power source module Maximum Power Output P
max, meet
the frequency f of high frequency power source is 0.5-50MHz, and the waveform of voltage source or current source is sinusoidal wave.
Further, transmitting coil internal resistance R
l1with receiving coil internal resistance R
l2include ohmic internal resistance and radiation internal resistance; Transmitting coil and receiving coil meet relation:
ω is system angle frequency, meets ω=2 π f, L
1for transmitting coil inductance, C
1for transmitting coil resonant capacitance, L
2for receiving coil inductance, C
2for receiving coil resonant capacitance, namely there is series resonance in transmitting coil and receiving coil under system frequency.
Further, the transmitting coil in transmission coil module and the distance between receiving coil are within electromagnetic wave half wavelength; The spacing of transmitting coil and receiving coil is not less than frequency bifurcated scope.
Further, the mutual inductance size between transmitting coil and receiving coil is M.When distance between two coils, orientation, angle etc. launch change, its mutual inductance size M also can convert thereupon.Can be measured the mutual inductance M of transmitting coil and receiving coil by mutual inductance detector in real time, and mutual inductance M is sent to impedance transformation controller with the form of the first input signal processes, wherein mutual inductance detector can be served as by instruments such as vector network analyzer VNA.
Further, there is an optimal load R when efficiency of transmission η of the outside of high frequency power source module obtains maximum
l.Optimal, meet
Further, load blocks is made up of load and load sensor, and load is purely resistive matter, resistance sense character or capacitance-resistance character.Load both can be fixed value, also can be variable value.Load impedance is measured by load sensor, and measurement result is sent to impedance transformation controller with the form of the second input signal processes.
Further, described impedance transformation controller data process comprises: impedance transformation controller receives the second input signal that the first input signal of providing of self-mutual inductance detector and load sensor provide.Pass through formula
the optimum load value R calculating now
l.Optimal, by comparing against actual load values R
lwith optimum load value R
l.Optimalsize, generate corresponding first control signal to control the parameter of secondary impedance converting network inner member; Then formula is passed through
the equivalent resistance R on former limit after the conversion of secondary impedance converting network can be calculated
eq, by comparing high frequency power source internal resistance value R
swith equivalent resistance R
eqsize, generate corresponding second control signal to control primary impedance converting network inner member parameter value.
Further, secondary impedance converting network is added between receiving coil and load, is made up of energy-storage travelling wave tube electric capacity and inductance.Secondary impedance converting network, by receiving the first control signal from impedance transformation controller, regulates inner parameter value, makes the equivalent resistance of entering viewed from load from port 44 ' be R
l.Optimal.Because N2 does not consume electric energy, then equivalent resistance R
l.Optimalthe electric energy consumed just equals the electric energy of load consumption, and namely now system can realize maximal efficiency transmission.
Further, if the equivalent resistance R of high frequency power source outside
eq≠ R
sthen between high frequency power source module output and the input of transmitting coil, add primary impedance converting network, primary impedance converting network is by receiving the second control signal from impedance transformation controller, regulate self relevant parameter, make the equivalent resistance R ' entered viewed from transmitting coil from high frequency power source module output
eqmeet: R '
eq=R
s, then now the power output of high frequency power source module is maximum.Because impedance transformer network is made up of energy-storage travelling wave tube electric capacity and inductance, do not consume electric energy, the electric energy that therefore high frequency power source module exports equals the electric energy that transmitting coil receiving terminal equivalent resistance consumes, according to formula P
22 '=P
11 'η is known, and the power of now load resistance acquisition is also maximum.
Compared with prior art, tool of the present invention has the following advantages and technique effect:
The resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network of the present invention, by adding suitable impedance transformer network respectively at transmitting terminal and receiving terminal, by means of the internal data process of impedance transformation controller, the Inside Parameter Value of real-time auto-adjustment control former and deputy limit impedance transformer network, resonance type wireless electric energy transmission system medium-high frequency power source maximum power output can be realized, and system transfers is most effective, it is maximum that load obtains through-put power.
Accompanying drawing explanation
Fig. 1 is system block diagram of the present invention.
Fig. 2 is the inner equivalent circuit diagram of high frequency power source.
Fig. 3 a, Fig. 3 b are two kinds of cut-away views (for L-type) of impedance transformer network.
Fig. 4 is system algorithm flow chart of the present invention.
Embodiment
Be further described below in conjunction with the concrete enforcement of accompanying drawing to invention, but enforcement of the present invention and protection are not limited thereto.
As shown in Figure 1, add the resonance type wireless electric energy transmission system of self adaptation both-end impedance transformer network, comprise high frequency power source module I, transmission coil module ii, load blocks III, impedance transformation controller C, primary impedance converting network N1 and secondary impedance converting network N2.Wherein module I high frequency power source module is by ideal voltage source U
swith internal resistance R
sbe composed in series, the output port of high frequency power source is 11 '; Transmission coil module ii comprises transmitting coil TX, receiving coil RX, mutual inductance detector M1, and wherein transmitting coil TX is equivalent to by transmitting coil internal resistance R
l1, the RLC series resonance mode that formed of transmitting coil inductance L 1 and transmitting coil resonant capacitance C1, receiving coil RX is equivalent to by receiving coil internal resistance R
l2, the RLC series resonance mode that formed of receiving coil inductance L 2 and receiving coil resonant capacitance C2, mutual inductance size between transmitting coil TX and receiving coil RX is M, measure with mutual inductance detector M1, and by measurement result to process in the form of the first input signal feeding impedance transformation controller C, wherein mutual inductance detector M1 can be served as by instruments such as vector network analyzer VNA, and mutual inductance M can change with changes such as the spacing between coil, position, angles.The port of transmitting coil TX is 33 ', and the port of receiving coil RX is 44 ', load R
lincoming end be 22 '.The input termination port one 1 ' of primary impedance converting network N1, output connects transmitting coil TX port 33 '; The input termination receiving coil RX port 44 ' of secondary impedance converting network N2, exports termination load port 22 '.Load sensor M2 in load blocks III detects load resistance R
lsize, and by testing result to process in the form of the second input signal feeding impedance transformation controller C.Impedance transformation controller C receives the second input signal that first input signal of self-mutual inductance detector M1 and load sensor M2 provide, through inter-process, namely first according to formula
calculate to obtain optimum load value R
l.Optimal, then according to optimum value R
l.Optimalwith actual value R
lsize, the parameter value calculating corresponding in impedance transformer network N2, and generate the first control signal; In like manner, first according to formula
calculate to obtain the equivalent resistance R of high frequency power source outside
eq, then according to equivalent resistance R
eqwith high frequency power source internal resistance R
ssize, the parameter value calculating corresponding in impedance transformer network N1, and generate the second control signal, wherein the first control signal is used for regulating the related parameter values in secondary impedance converting network N2, and the first control signal is used for regulating the related parameter values in impedance transformer network N2.Wherein signal 1 represents the first input signal, and signal 2 represents the second input signal, and signal 3 represents the first control signal, and signal 4 represents the second control signal.
Through above-mentioned regulation and control process, the equivalent resistance of entering viewed from load from port 44 ' can be made to be optimum value R
l.Optimal thus make the efficiency of transmission of high frequency power source outside the highest; The equivalent resistance of entering viewed from transmitting coil direction from port one 1 ' can be made to equal the internal resistance R of high frequency power source module simultaneously
s, thus make high frequency power source Maximum Power Output; Finally make load resistance R
lobtain maximum power.
As shown in Figure 2, according to Thevenin's theorem or Norton theorem: any active two-port network or practical power all can be equivalent to an ideal voltage source U
swith internal resistance of source R
scascade, or be equivalent to an ideal current source I
swith source resistance R
sparallel form, the two meets relational expression U
s=R
si
s.Equivalent resistance when high frequency power source outside is R
eq, and meet R
eq=R
stime, high frequency power source Maximum Power Output P
max, meet
wherein the frequency of high frequency power source is f, and span is 0.5-50MHz, and its waveform is high_frequency sine wave.
The structure of transmission coil mainly contains plane disc type and spatially spiral formula two kinds.The advantage of plane sandwich wound coil takes up room little, and be convenient to actual installation, its practical application is wider; Spatially spiral formula coil can produce comparatively uniform magnetic field.Any coil all can be equivalent to the cascade of its internal resistance and its inductance, and its internal resistance comprises Ohmic resistance and radiation resistance.As the resonance type wireless delivery of electrical energy of coil will be realized, then generally need external resonant capacitance of connecting, make it meet RLC series resonance frequency and equal system angle frequencies omega, and meet ω=2 π f; If be issued to self-resonance state in the effect of coil parasitic capacitance, and self-resonant frequency equals system frequency just, then without the need to adding external capacitor.Certainly the present invention includes various types of coil, be not limited in this.
As shown in Figure 3 a, 3 b, can select different impedance transformer networks for different loads, impedance transformer network mainly contains the types such as L-type, T-shaped, ∏ type, and the present invention is illustrated for L-type impedance transformer network temporarily, but is not limited in this.For purely resistive load R
l, by adding L-type impedance transformer network, arbitrary target resistance value can be equivalent to.L-type impedance transformer network mainly contains two kinds of connected modes, positive L-type impedance transformer network as shown in Figure 3 a and Figure 3 b shows and inverted L shape impedance transformer network, wherein energy-storage travelling wave tube X1 and X2 is the combination of inductance or electric capacity, and can not be electric capacity or inductance simultaneously, former resistance R, by designing appropriate electric capacity, inductance parameters, can be equivalent to arbitrary target resistance R by the positive L-type impedance transformer network shown in Fig. 3 a
eq3, wherein R
eq3> R; Former resistance R, by designing appropriate electric capacity, inductance parameters, can be equivalent to arbitrary target resistance R by the inverted L shape impedance transformer network shown in Fig. 3 b
eq4, wherein R
eq4< R.
Fig. 4 is the algorithm for design flow chart of native system.At known high frequency power source module middle ideal voltage source U
s, internal resistance R
s, supply frequency f, transmitting coil inductance L 1 and internal resistance R
l1, receiving coil inductance L 2 and internal resistance R
l2, mutual inductance M, load resistance R
lcondition under: (1) (1) first, regulates the resonant capacitance (C1, C2) of transmitting coil and receiving coil, makes it meet
wherein ω=2 π f, namely now system reaches resonance condition.(2) the mutual inductance value M between transmitting coil and receiving coil is sent into impedance transformation controller C with the form of the first input signal by mutual inductance detector M1, simultaneously the load value R that will detect of load sensor M2
lsend in impedance transformation controller C with the form of the second input signal, impedance transformation controller C is by comparing actual loading resistance R
loptimum resistance value R when transmitting with system maximal efficiency
l.Optimalsize
generate the first control signal to secondary impedance converting network N2, regulate the parameter value of its inside, if wherein R
l< R
l.Optimal, then secondary impedance converting network selects positive L-type impedance transformer network and corresponding parameter value thereof automatically, if R
l> R
l.Optimal, then secondary impedance converting network selects inverted L shape impedance transformer network and corresponding parameter value thereof automatically; Then impedance transformation controller C compares the outside equivalent resistance R of high frequency power source
eqwith internal resistance of source R
ssize (wherein
), generate the second control signal to primary impedance converting network N1, regulate the parameter value of its inside, if wherein R
eq< R
s, then primary impedance converting network selects positive L-type impedance transformer network and corresponding parameter value thereof automatically; If R
eq> R
s, then primary impedance converting network selects inverted L shape impedance transformer network and corresponding parameter value thereof automatically.(3) through the impedance transformation of primary impedance converting network N1 and secondary impedance converting network N2, native system can be made to think that the equivalent resistance of entering viewed from transmitting coil direction is R from port one 1 '
s, the equivalent resistance of entering viewed from load from port 44 ' is R
l.Optimal.(4) through above-mentioned design, when transmission coil or load variations, native system can realize following functions automatically, i.e. high frequency power source Maximum Power Output, high frequency power source external transmission is most effective, and load obtains maximum transmission power in real time.
Claims (10)
1. add the resonance type wireless electric energy transmission system of self adaptation both-end impedance transformer network, it is characterized in that comprising high frequency power source module (I), transmission coil module (II), load blocks (III), impedance transformation controller (C), primary impedance converting network (N1), secondary impedance converting network (N2); Wherein high frequency power source module (I) is by ideal voltage source (U
s) and internal resistance (R
s) be composed in series, for system provides electric energy; Transmission coil module (II) comprises transmitting coil (TX), receiving coil (RX), mutual inductance detector (M1), and wherein transmitting coil (TX) is equivalent to by transmitting coil internal resistance (R
l1), the RLC series resonance mode that formed of transmitting coil inductance (L1) and transmitting coil resonant capacitance (C1), receiving coil (RX) is equivalent to by receiving coil internal resistance (R
l2), the RLC series resonance mode that formed of receiving coil inductance (L2) and receiving coil resonant capacitance (C2); The input of primary impedance converting network (N1) is connected with the output of high frequency power source, and output is connected with the transmitting coil TX in transmission coil module (II); Load blocks (III) is by load (R
l) and load sensor (M2) composition; Impedance transformation controller (C) is by receiving the first input signal of self-mutual inductance detector (M1) and the second input signal of load sensor (M2), through internal data process, send the first control signal and the second control signal to secondary impedance converting network (N2) and primary impedance converting network (N1), and then regulate their Inside Parameter Value; The input of secondary impedance matching network (N2) is connected with the receiving coil (RX) in transmission coil module (II), its output and load (R
l) be connected, by receiving the parameter value regulating self from the first control signal of impedance transformation controller (C); The input of primary impedance converting network (N1) is connected with the output of high frequency power source module, its output is connected with the transmitting coil (TX) in transmission coil module (II), by receiving the parameter value regulating self from the second control signal of impedance transformation controller (C).
2. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 1, is characterized in that, according to Thevenin's theorem and Norton theorem, high frequency power source module (I) can be equivalent to an ideal voltage source U
swith equivalent source internal resistance R
sseries connection, also can be equivalent to an ideal current source I
swith equivalent source internal resistance R
sparallel form, both meet U
s=R
si
srelation, the equivalent resistance when high frequency power source outside is R
eq, and R
eq=R
stime, high frequency power source module (I) Maximum Power Output P
max, meet
the frequency f of high frequency power source is 0.5-50MHz, and the waveform of voltage source or current source is sinusoidal wave.
3. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 1, is characterized in that transmitting coil internal resistance R
l1with receiving coil internal resistance R
l2include ohmic internal resistance and radiation internal resistance; Transmitting coil (TX) and receiving coil (RX) meet relation:
ω is system angle frequency, meets ω=2 π f, L
1for transmitting coil inductance, C
1for transmitting coil resonant capacitance, L
2for receiving coil inductance, C
2for receiving coil resonant capacitance, namely there is series resonance in transmitting coil (TX) and receiving coil (RX) under system frequency.
4. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 3, is characterized in that distance between transmitting coil (TX) in transmission coil module (II) and receiving coil (RX) is within electromagnetic wave half wavelength; The spacing of transmitting coil (TX) and receiving coil (RX) is not less than frequency bifurcated scope.
5. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 3, it is characterized in that, the mutual inductance size between transmitting coil (TX) and receiving coil (RX) is M.When distance between two coils, orientation, angle etc. launch change, its mutual inductance size M also can convert thereupon.The mutual inductance M of transmitting coil (TX) and receiving coil (RX) can be measured in real time by mutual inductance detector (M1), and mutual inductance M is sent to impedance transformation controller (C) with the form of the first input signal processes, wherein mutual inductance detector can be served as by instruments such as vector network analyzer VNA.
6. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 1, is characterized in that there is an optimal load R when efficiency of transmission η of the outside of high frequency power source module obtains maximum
l.Optimal, meet
7. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 1, it is characterized in that, load blocks (III) is by load (R
l) and load sensor (M2) composition, load is purely resistive matter, resistance sense character or capacitance-resistance character.Load both can be fixed value, also can be variable value.Load impedance is measured by load sensor (M2), and measurement result is sent to impedance transformation controller (C) with the form of the second input signal processes.
8. the resonance type wireless electric energy transmission system of interpolation self adaptation both-end impedance transformer network according to claim 1, it is characterized in that, described impedance transformation controller (C) data processing comprises: impedance transformation controller (C) receives the second input signal that the first input signal of providing of self-mutual inductance detector (M1) and load sensor (M2) provide.Pass through formula
the optimum load value R calculating now
l.Optimal, by comparing against actual load values R
lwith optimum load value R
l.Optimalsize, generate corresponding first control signal to control the parameter of secondary impedance converting network (N2) inner member; Then formula is passed through
the equivalent resistance R on former limit after secondary impedance converting network (N2) conversion can be calculated
eq, by comparing high frequency power source internal resistance value R
swith equivalent resistance R
eqsize, generate corresponding second control signal to control primary impedance converting network (N1) inner member parameter value.
9. the resonance type wireless electric energy transmission system of the interpolation self adaptation both-end impedance transformer network according to claim 7 or 8, it is characterized in that, secondary impedance converting network (N2) is added on receiving coil (RX) and load (R
l) between, be made up of energy-storage travelling wave tube electric capacity and inductance.Secondary impedance converting network (N2), by receiving the first control signal from impedance transformation controller (C), regulates inner parameter value, makes the equivalent resistance of entering viewed from load from port 44 ' be R
l.Optimal.Because N2 does not consume electric energy, then equivalent resistance R
l.Optimalthe electric energy consumed just equals load (R
l) electric energy that consumes, namely now system can realize maximal efficiency transmission.
10. the resonance type wireless electric energy transmission system of the interpolation self adaptation both-end impedance transformer network according to claim 1 and 2, is characterized in that, if the equivalent resistance R of high frequency power source outside
eq≠ R
sthen between high frequency power source module (I) output and the input of transmitting coil (TX), add primary impedance converting network (N1), primary impedance converting network (N1) is by receiving the second control signal from impedance transformation controller (C), regulate self relevant parameter, make the equivalent resistance R ' entered viewed from transmitting coil from high frequency power source module output
eqmeet: R '
eq=R
s, then now the power output of high frequency power source module (I) is maximum.Because impedance transformer network (N1) is made up of energy-storage travelling wave tube electric capacity and inductance, do not consume electric energy, the electric energy that therefore high frequency power source module (I) exports equals the electric energy that transmitting coil receiving terminal equivalent resistance consumes, according to formula P
22 '=P
11 'η is known, now load resistance (R
l) power that obtains is also maximum.
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| CN110858728A (en) * | 2018-08-24 | 2020-03-03 | 赵一阳 | Wireless energy transmission system and wireless energy transmission control method |
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