WO2014125732A1 - パラメータ導出方法 - Google Patents
パラメータ導出方法 Download PDFInfo
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- WO2014125732A1 WO2014125732A1 PCT/JP2013/084008 JP2013084008W WO2014125732A1 WO 2014125732 A1 WO2014125732 A1 WO 2014125732A1 JP 2013084008 W JP2013084008 W JP 2013084008W WO 2014125732 A1 WO2014125732 A1 WO 2014125732A1
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- 238000009795 derivation Methods 0.000 title claims abstract description 12
- 230000008878 coupling Effects 0.000 claims abstract description 87
- 238000010168 coupling process Methods 0.000 claims abstract description 87
- 238000005859 coupling reaction Methods 0.000 claims abstract description 87
- 230000005540 biological transmission Effects 0.000 claims abstract description 57
- 230000005684 electric field Effects 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 67
- 238000009499 grossing Methods 0.000 claims description 6
- 230000014509 gene expression Effects 0.000 abstract description 27
- 238000005259 measurement Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 12
- 239000004020 conductor Substances 0.000 description 3
- 230000003071 parasitic effect Effects 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
- G01R21/07—Arrangements for measuring electric power or power factor by measuring current and voltage in circuits having distributed constants
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/05—Circuit arrangements or systems for wireless supply or distribution of electric power using capacitive coupling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/16—Measuring impedance of element or network through which a current is passing from another source, e.g. cable, power line
- G01R27/18—Measuring resistance to earth, i.e. line to ground
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- H02J7/025—
Definitions
- the present invention relates to a parameter derivation method for deriving parameters relating to electric field coupling in an electric field coupling type wireless power transmission system.
- Patent Document 1 As a wireless power transmission system, for example, an electric field coupling type wireless power transmission system disclosed in Patent Document 1 is known.
- the active electrode and the passive electrode of the power transmission device and the active electrode and the passive electrode of the power reception device come close to each other through a gap, so that the two electrodes are capacitively coupled to each other, and the power transmission device to the power reception device. Power is transmitted.
- the active electrode in each of the power transmission device and the power reception device, the active electrode is surrounded by the passive electrode, and the coupling capacitance between the passive electrodes is increased. Thereby, the tolerance with respect to the relative position shift of a power transmission apparatus and a power receiving apparatus increases, and the convenience improves.
- the degree of coupling between the power transmitting apparatus and the power receiving apparatus is increased, so that power transmission efficiency can be increased and the apparatus can be downsized.
- the center conductor is electrostatically shielded by the structure surrounding the center conductor with surrounding conductors, and unnecessary radiation can be reduced.
- Patent Document 1 in an electric field coupling type power transmission system, it is necessary to optimize the coupling capacity and coupling coefficient between electrodes in order to increase the power transmission efficiency. Further, considering compatibility with many devices, it is necessary to quantify the capacitive coupling portion. However, in the configuration described in Patent Document 1, although the capacitance generated between the electrodes can be increased, the coupling capacitance and the coupling coefficient are not known, and the appropriate values thereof are not known. For this reason, it is necessary to repeat the design of the active electrode and the passive electrode by so-called “cut and try”, which requires labor and time.
- an object of the present invention is to provide a parameter derivation method capable of deriving a parameter value relating to practical electric field coupling that is closer to an actual operation state in order to increase power transmission efficiency.
- the present invention provides a power transmission device that applies an alternating voltage boosted by a step-up transformer to a first electrode and a second electrode, a third electrode that faces the first electrode with a gap, and the second electrode
- a voltage receiving device that rectifies and smoothes an alternating voltage that has been stepped down by a step-down transformer and stepped down by a rectifying and smoothing circuit
- a parameter derivation method for a wireless power transmission system for transmitting power from the power transmission device to the power reception device by electric field coupling, wherein the parameters include the first electrode, the second electrode, the third electrode, and the first electrode.
- the coupling coefficient ke is derived based on the formula (A) or the formula (B) using the anti-resonance frequency ⁇ a.
- the coupling coefficient ke between the electrodes can be derived and the first electrode, the second electrode, the third electrode and the like to make this a prescribed value or to optimize the coupling coefficient
- the shape and size of the fourth electrode can be easily designed. And the power transmission efficiency of a wireless power transmission system can be improved.
- the parameters include a capacitance C 1 of a first capacitor connected in parallel to a secondary coil of the step-up transformer constituting an equivalent circuit of a capacitive coupling unit, and a capacitance of a second capacitor connected in parallel to the primary coil of the step-down transformer.
- each capacitance value can be quantified using a simple equivalent circuit ( ⁇ -type equivalent circuit using three elements) by deriving each capacitance C 1 , C 2 , C 3 .
- a simple equivalent circuit ⁇ -type equivalent circuit using three elements
- the present invention provides a power transmission device that applies an alternating voltage boosted by a step-up transformer to a first electrode and a second electrode, a third electrode that faces the first electrode with a gap, and the second electrode
- a voltage receiving device that rectifies and smoothes an alternating voltage that has been stepped down by a step-down transformer and stepped down by a rectifying and smoothing circuit
- a secondary side of the step-down transformer which includes a coupling coefficient ke of an electric field coupling portion composed of an electrode and the fourth electrode, and is measured with the first electrode and the second electrode open.
- the coupling coefficient ke is derived based on the equation (A) or the equation (B) using the resonance frequency ⁇ r or the antiresonance frequency ⁇ a of the input impedance viewed from the viewpoint.
- the coupling coefficient ke between the electrodes can be derived and the first electrode, the second electrode, the third electrode and the like to make this a prescribed value or to optimize the coupling coefficient
- the shape and size of the fourth electrode can be easily designed. And the power transmission efficiency of a wireless power transmission system can be improved.
- the parameters include the capacitance C 1 of the second capacitor connected in parallel to the primary coil of the step-down transformer and the first capacitor connected in parallel to the secondary coil of the step-up transformer, which constitute an equivalent circuit of the capacitive coupling unit.
- each capacitance value can be quantified using a simple equivalent circuit ( ⁇ -type equivalent circuit using three elements) by deriving each capacitance C 1 , C 2 , C 3 .
- a simple equivalent circuit ⁇ -type equivalent circuit using three elements
- the coupling coefficient ke between the electrodes can be derived and the first electrode, the second electrode, the third electrode and the like to make this a prescribed value or to optimize the coupling coefficient
- the shape and size of the fourth electrode can be easily designed. And the power transmission efficiency of a wireless power transmission system can be improved.
- the shape of each electrode is compared with the case where the design of each electrode is repeated by so-called “cut and try” so as to obtain a desired capacitive coupling.
- the size design becomes easy. Even if the value of the coupling capacitance is very small, the measurement error can be reduced as compared with the case where the parameter of the capacitive coupling portion is measured by cutting the electrode and the circuit.
- Circuit diagram of wireless power transmission system showing equivalent circuit of capacitive coupling
- the figure which shows the measurement result of the frequency characteristic when the capacitor part is not short-circuited The figure which shows the measurement result of the frequency characteristic when the capacitor part is short-circuited
- FIG. 1 is a circuit diagram of a wireless power transmission system 300 according to the present embodiment.
- the wireless power transmission system 300 includes a power transmission device 101 and a power reception device 201.
- the power receiving apparatus 201 includes a load RL.
- the load RL is a battery module including a secondary battery and a charging circuit.
- the power receiving apparatus 201 is a portable electronic device provided with the secondary battery, for example. Examples of portable electronic devices include mobile phones, PDAs, portable music players, notebook PCs, digital cameras, and the like.
- the power receiving device 201 is placed on the power transmitting device 101, and the power transmitting device 101 charges the secondary battery of the power receiving device 201.
- the power transmission device 101 includes a DC power source Vin that outputs DC 5V or 12V.
- An input capacitor Cin is connected to the DC power source Vin.
- the DC power source Vin is connected to a DC-AC inverter circuit that converts a DC voltage into an AC voltage.
- the DC-AC inverter circuit has switching elements Q1, Q2, Q3, and Q4, and the switching elements Q1 and Q4 and the switching elements Q2 and Q3 are alternately turned on and off.
- connection point of the switching elements Q1, Q2 and the connection point of the switching elements Q3, Q4, 1 primary coil L 11 of the step-up transformer T1 is connected.
- Active electrode 11 and passive electrode 12 is connected to the secondary coil L 12 of the step-up transformer T1.
- the step-up transformer T1 boosts the alternating voltage and applies the boosted alternating voltage between the active electrode 11 and the passive electrode 12.
- the frequency of the AC voltage is determined within a range of 100 kHz to 10 MHz.
- Capacitor Ca to the secondary coil L 12 of the step-up transformer T1 are connected in parallel.
- the capacitor Ca is a stray capacitance generated between the active electrode 11 and the passive electrode 12 or, if a capacitor is connected, a combined capacitance of the capacitance of the capacitor and the stray capacitance.
- Capacitor Ca forms a series resonant circuit with the leakage inductance of the secondary coil L 12 of the step-up transformer T1 (not shown).
- the power receiving apparatus 201 includes an active electrode 21 and a passive electrode 22.
- the active electrode 21 and the passive electrode 22 face the active electrode 11 and the passive electrode 12 of the power transmission device 101 with a gap when the power receiving device 201 is placed on the power transmission device 101.
- the passive electrodes 12 and 22 may be in direct contact.
- the capacitor Caa shown in FIG. 1 is a capacitance formed between the active electrodes 11 and 21, and the capacitor Cpp is a capacitance formed between the passive electrodes 12 and 22.
- Capacitor Cb is connected to the primary coil L 21.
- the capacitor Cb is a stray capacitance generated between the active electrode 21 and the passive electrode 22 or, if a capacitor is connected, a combined capacitance of the capacitance of the capacitor and the stray capacitance.
- Capacitor Cb form a parallel resonant circuit by the exciting inductance of the primary coil L 21 of the step-down transformer T2.
- Buck The secondary coil L 22 of the transformer T2, 4 one is a diode diode bridge DB are connected.
- a load RL which is a secondary battery, is connected to the diode bridge DB via a smoothing capacitor Cout.
- the power receiving apparatus 201 is mounted on the power transmitting apparatus 101, and a voltage is applied between the active electrode 11 and the passive electrode 12 of the power transmitting apparatus 101, so that the active electrodes 11 and 21 that are opposed to each other and the passive electrode 12 are placed. , 22 are capacitively coupled to generate an electric field. Then, power is transmitted from the power transmitting apparatus 101 to the power receiving apparatus 201 via this electric field.
- the AC voltage induced by power transmission is stepped down by the step-down transformer T2, rectified and smoothed by the diode bridge DB and the smoothing capacitor Cout, and applied to the load RL.
- a method of deriving parameters relating to capacitive coupling by the active electrode 11, the passive electrode 12, the active electrode 21, and the passive electrode 22 in the wireless power transmission system 300 having the above configuration will be described.
- Deriving parameters related to capacitive coupling makes it easy to design the size and shape of each of the active electrodes 11 and 21 and the passive electrodes 12 and 22, and repeats the design of the electrodes by trial and error through so-called “cut and try”. Compared to, design and prototype time and labor can be reduced.
- the coupling coefficient ke of the active electrodes 11 and 12 and the passive electrodes 12 and 22 is derived.
- the coupling coefficient ke By deriving the coupling coefficient ke, the magnitude of capacitive coupling between the electrodes can be grasped, and the level of power transmission efficiency can be determined.
- This coupling coefficient ke can be derived by measuring the resonance frequency and anti-resonance frequency of the capacitive coupling portion between the power transmitting apparatus 101 and the power receiving apparatus 201 and using a predetermined mathematical formula.
- M1 and M2 in FIG. 1 indicate measurement points of the resonance frequency and the antiresonance frequency.
- a method for deriving the coupling coefficient ke will be described by paying attention to the input impedance when the power receiving apparatus 201 side is viewed from the measurement locations M1 and M2.
- the measurement of the resonance frequency and the anti-resonance frequency is not limited to the measurement of the impedance Z but can be similarly performed from the frequency characteristics of the admittance Y and the S parameter S11.
- the coupling coefficient of the step-up transformer T1 is represented by km1
- the coupling coefficient of the step-down transformer T2 is represented by km2 .
- FIG. 2 is a diagram showing an equivalent circuit of the capacitive coupling unit.
- the upper diagram of FIG. 2 represents the step-up transformer T1 and the step-down transformer T2 as T-type equivalent circuits.
- This T-type equivalent circuit shows only an equivalent circuit of an inductance part of the step-up transformer T1 and the step-down transformer T2, and an illustration of an ideal transformer which is a transformer part is omitted.
- C 1 the capacitance of the capacitor C1 in the figure, represents the capacitance of the capacitor C2 and the capacitance of C 2, the capacitor C3 at C 3.
- the lower diagram of FIG. 2 is a circuit diagram in the case where the T-type equivalent circuit of the step-down transformer T2 is replaced with one inductor Leq.
- the input terminals IN1 and IN2 shown in FIG. 2 correspond to the measurement points M1 and M2 in FIG. 1, and the DC-AC inverter circuit in FIG. 1 is connected to the input terminals IN1 and IN2. Further, the diode bridge DB shown in FIG. 1 is connected to the output terminals OUT1 and OUT2.
- the resonance frequency and the antiresonance frequency are measured for each of the case where the capacitor C2 portion (that is, the active electrode and the passive electrode of the power receiving device) is not short-circuited and the case where the capacitor is short-circuited.
- the frequency characteristic of the impedance of the circuit viewed from the input terminals IN1 and IN2 is measured without short-circuiting the capacitor C2 portion.
- FIG. 3 is a diagram illustrating a measurement result of frequency characteristics when the capacitor C2 portion is not short-circuited. In the case where the capacitor C2 portion is not short-circuited, the resonance frequencies f 1 and f 2 and the anti-resonance frequencies f 00 and f 0 can be measured as shown in FIG.
- the coupling When measuring, weaken the coupling between the load and the resonance circuit so as not to lower the Q of the power-reception-side resonance circuit.
- the coupling can be weakened even if the load is connected. Any means that weakens the coupling (provides a switch that does not physically connect the load and disconnects the load and the resonance circuit) can be applied.
- FIG. 4 is a diagram illustrating a measurement result of frequency characteristics when the capacitor C2 portion is short-circuited.
- the resonance frequency fr and the antiresonance frequency fa can be measured as shown in FIG.
- the angular frequencies corresponding to the resonance frequencies f 1 and f 2 and the anti-resonance frequencies f 00 and f 0 are assumed to be ⁇ 1 , ⁇ 2 ( ⁇ 1 ⁇ ⁇ 2 ), ⁇ 00 , and ⁇ 0 . Further, the angular frequencies corresponding to the resonance frequency fr and the antiresonance frequency fa are ⁇ r and ⁇ a.
- the input impedance Zin when the capacitor C2 portion is not short-circuited, the input impedance Zin can be expressed by the following equation (1).
- L 1S is a leakage inductance of the step-up transformer T1.
- the coupling coefficient ke (ke> 0) is expressed by the following formula from the formulas (9) and (10). (16).
- the coupling coefficient ke is solved from the equations (14) and (15) using the resonance frequencies ⁇ 1 , ⁇ 2 , and ⁇ r obtained by the measurement, the coupling coefficient ke (ke> 0) is (17).
- the electrodes of the power transmission device 101 that are capacitively coupled by the equation (16) or the equation (17) are received.
- the coupling coefficient ke with the electrode of the device 201 can be derived.
- Expressions (16) and (17) are not derived only from Expressions (9), (10) and Expressions (14) and (15), respectively, but are represented by Expressions (9), (10), and (14). , (15) can be derived by calculating simultaneous equations from any two of the equations.
- the inductance L 1 of the secondary coil L 12 of the step-up transformer T1 and the inductance Leq of the inductor Leq are measured.
- the inductance measuring method of the secondary coil L 12, e.g., a secondary coil L 12, taking into account the parallel resonance circuit and the parasitic capacitance of the secondary coil L 12 has to measure the frequency characteristics of the circuit, that results from deriving the inductance L 1 of the inductor L 12. Note that in the power transmission device 101, if the shield to the step-up transformer T1 is provided to measure the inductance L 1 while wearing the shield. It is desirable to measure the inductance value of the step-up / step-down transformer in a state where it is incorporated in the apparatus.
- Inductance of the inductor Leq can be derived by measuring the inductance L 2 of the primary coil L 21 of the step-down transformer T2.
- Inductance Measurement method of primary coil L 21 of the step-down transformer T2 is the same as the inductance measuring method of the secondary coil L 12 of the step-up transformer T1.
- the inductance Leq inductor Leq in that case L 2 i.e., the primary coil L of the step-down transformer T2 21 inductance.
- the inductance Leq of the inductor Leq is (1 ⁇ k m2 2 ) L 2 . What is necessary is just to select suitably according to a circuit whether the secondary coil of step-down transformer T2 is short-circuited or open
- capacitances C G , C L , C 1 , C 2 , and C 3 are derived using the measured inductance L 2 and the derived inductance Leq.
- the method of deriving the coupling coefficient ke and the capacitance values C1, C2, and C3 has been described by paying attention to the input impedance when viewed from the power transmitting apparatus 101.
- the input viewed from the power receiving apparatus 201 is described. You may make it derive
- FIG. 5 is a diagram illustrating an equivalent circuit of the capacitive coupling unit when attention is paid to the input impedance viewed from the power receiving apparatus 201.
- the circuit shown in the lower part of FIG. 5 has a configuration in which the T-type equivalent circuit of the step-up transformer T1 is replaced with one inductor Leq.
- the resonance frequency and the anti-resonance frequency are measured when the capacitor C1 portion (that is, the active electrode and the passive electrode of the power transmission device) is short-circuited and when it is not short-circuited. 17), the coupling coefficient ke can be derived.
- the power supply circuit and the resonance circuit should be connected so as not to lower the Q of the power transmission side resonance circuit. It is necessary to weaken the bond.
- the coupling can be weakened even when the power supply is connected. Any means for weakening the coupling (a switch that cuts off the power supply and the resonance circuit without physically connecting the power supply) can be applied.
- capacitors C1, C2, and C3 shown in the circuit shown in FIG. 5 can be derived by the following equations (20) and (21).
- equation (20) and formula (21) can be derived
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Abstract
Description
次に、測定したインダクタンスL2と、導出したインダクタンスLeqとを用いて、キャパシタンスCG,CL,C1,C2,C3を導出する。式(4)および式(5)それぞれを変形することで、以下の式(18)および式(19)となる。
12-パッシブ電極(第2の電極)
21-アクティブ電極(第3の電極)
22-パッシブ電極(第4の電極)
101-送電装置
201-受電装置
300-ワイヤレス電力伝送システム
C1,C2,C3-キャパシタ
M1,M2-測定箇所
IN1,IN2-入力端子
OUT1,OUT2-出力端子
T1-昇圧トランス
T2-降圧トランス
L11,L21-1次コイル
L12,L22-2次コイル
Claims (4)
- 昇圧トランスで昇圧した交流電圧を第1の電極および第2の電極に印加する送電装置と、
前記第1の電極と間隙を置いて対向する第3の電極、および、前記第2の電極と接触する、または、間隙を置いて対向する第4の電極に誘起される電圧を降圧トランスで降圧し、整流平滑回路で降圧した交流電圧を整流および平滑する受電装置と、
を備え、前記送電装置から前記受電装置へ電界結合により電力伝送するワイヤレス電力伝送システムのパラメータを導出するパラメータ導出方法であって、
前記パラメータは、前記第1の電極、前記第2の電極、前記第3の電極および前記第4の電極で構成される電界結合部の結合係数keを含み、
前記第3の電極と前記第4の電極を開放した状態で測定された、前記昇圧トランスの1次側からみた入力インピーダンスの共振周波数ω1,ω2または反共振周波数ω00,ω0と、
前記第3の電極と前記第4の電極を短絡した状態で測定された、前記昇圧トランスの1次側からみた入力インピーダンスの共振周波数ωrまたは反共振周波数ωaと、
を用いて、
前記結合係数keを、式(A)または式(B)に基づいて導出する、パラメータ導出方法。
- 昇圧トランスで昇圧した交流電圧を第1の電極および第2の電極に印加する送電装置と、
前記第1の電極と間隙を置いて対向する第3の電極、および、前記第2の電極と接触する、または、間隙を置いて対向する第4の電極に誘起される電圧を降圧トランスで降圧し、整流平滑回路で降圧した交流電圧を整流および平滑する受電装置と、
を備え、前記送電装置から前記受電装置へ電界結合により電力伝送するワイヤレス電力伝送システムのパラメータを導出するパラメータ導出方法であって、
前記パラメータは、前記第1の電極、前記第2の電極、前記第3の電極および前記第4の電極で構成される電界結合部の結合係数keを含み、
前記第1の電極と前記第2の電極を開放した状態で測定された、前記降圧トランスの2次側からみた入力インピーダンスの共振周波数ω1,ω2または反共振周波数ω00,ω0と、
前記第1の電極と前記第2の電極を短絡した状態で測定された、前記降圧トランスの2次側からみた入力インピーダンスの共振周波数ωrまたは反共振周波数ωaと、
を用いて、
前記結合係数keを、式(A)または式(B)に基づいて導出する、パラメータ導出方法。
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CN201380062103.4A CN104823354B (zh) | 2013-02-14 | 2013-12-19 | 参数导出方法 |
GB1511690.8A GB2524683A (en) | 2013-02-14 | 2013-12-19 | Parameter derivation method |
JP2015500116A JP5741778B2 (ja) | 2013-02-14 | 2013-12-19 | パラメータ導出方法 |
US14/744,089 US9846183B2 (en) | 2013-02-14 | 2015-06-19 | Parameter derivation method |
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JPWO2016084524A1 (ja) * | 2014-11-27 | 2017-04-27 | 株式会社村田製作所 | 送電装置及び電力伝送システム |
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EP3167466A4 (en) * | 2014-07-09 | 2018-03-14 | Auckland Uniservices Limited | Inductive power system suitable for electric vehicles |
WO2018191609A1 (en) * | 2017-04-13 | 2018-10-18 | Mansell Richard Marion | System and method for wireless transmission of power |
CN110036550A (zh) | 2017-05-26 | 2019-07-19 | 株式会社村田制作所 | 双向无线电力输送系统 |
US10333355B2 (en) * | 2017-07-21 | 2019-06-25 | Witricity Corporation | Wireless charging magnetic parameter determination |
US11139690B2 (en) * | 2018-09-21 | 2021-10-05 | Solace Power Inc. | Wireless power transfer system and method thereof |
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JP2011045161A (ja) * | 2009-08-19 | 2011-03-03 | Nagano Japan Radio Co | 送電装置および非接触型電力伝送システム |
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WO2003098802A1 (en) * | 2002-05-20 | 2003-11-27 | Philips Intellectual Property & Standards Gmbh | Filter structure |
JP4594165B2 (ja) * | 2005-05-24 | 2010-12-08 | 株式会社日立産機システム | 電動機制御装置の機械系パラメータ推定方法及びシステム |
EP2446520A4 (en) | 2009-06-25 | 2017-05-03 | Murata Manufacturing Co., Ltd. | Power transfer system and noncontact charging device |
JP5093369B2 (ja) * | 2010-07-28 | 2012-12-12 | 株式会社村田製作所 | 送電装置、受電装置および電力伝送システム |
US8620250B2 (en) * | 2010-10-27 | 2013-12-31 | Hollinworth Fund, L.L.C. | Resonator-based filtering |
CN102126855A (zh) * | 2010-11-19 | 2011-07-20 | 上海海事大学 | 一种高温大功率压电陶瓷的生产方法 |
CN102893493B (zh) * | 2011-05-13 | 2015-10-21 | 株式会社村田制作所 | 电力发送设备、电力接收设备及电力传输系统 |
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JP2011045161A (ja) * | 2009-08-19 | 2011-03-03 | Nagano Japan Radio Co | 送電装置および非接触型電力伝送システム |
JP2013187963A (ja) * | 2012-03-06 | 2013-09-19 | Murata Mfg Co Ltd | 電力伝送システムおよび送電装置 |
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GB2524683A (en) | 2015-09-30 |
CN104823354A (zh) | 2015-08-05 |
GB201511690D0 (en) | 2015-08-19 |
US20150285845A1 (en) | 2015-10-08 |
CN104823354B (zh) | 2016-12-14 |
JPWO2014125732A1 (ja) | 2017-02-02 |
US9846183B2 (en) | 2017-12-19 |
JP5741778B2 (ja) | 2015-07-01 |
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