JP5465640B2 - Resonance type wireless power transmission apparatus and resonance type wireless power transmission method - Google Patents

Resonance type wireless power transmission apparatus and resonance type wireless power transmission method Download PDF

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JP5465640B2
JP5465640B2 JP2010204212A JP2010204212A JP5465640B2 JP 5465640 B2 JP5465640 B2 JP 5465640B2 JP 2010204212 A JP2010204212 A JP 2010204212A JP 2010204212 A JP2010204212 A JP 2010204212A JP 5465640 B2 JP5465640 B2 JP 5465640B2
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達也 清水
貴史 丸山
正孝 飯塚
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本発明は、送電部から受電部へ送電する際の送電効率を改善する共鳴型無線電力伝送装置および共鳴型無線電力伝送方法に関する。   The present invention relates to a resonance type wireless power transmission apparatus and a resonance type wireless power transmission method that improve power transmission efficiency when power is transmitted from a power transmission unit to a power reception unit.

Andre Kursらが提案している共鳴型無線電力伝送は、送電部と受電部に配置した共鳴素子間を磁界共鳴の関係にすることで送電効率を改善する非接触電力伝送方法の一種である（非特許文献１，非特許文献２）。この共鳴型無線電力伝送は、電磁誘導を利用した非接触給電方法と比較して、軸ずれに対する許容範囲が広く、ある程度離れた距離でも伝送効率が高効率になる特徴を有している。   Resonance type wireless power transmission proposed by Andre Kurs et al. Is a kind of non-contact power transmission method that improves power transmission efficiency by making a magnetic field resonance relationship between the resonant elements arranged in the power transmission unit and the power reception unit ( Non-patent document 1, Non-patent document 2). This resonance type wireless power transmission has a feature that it has a wide tolerance range for axial misalignment and high transmission efficiency even at a certain distance, compared to a non-contact power feeding method using electromagnetic induction.

図９は、従来の共鳴型無線電力伝送装置の構成例を示す。
図９において、送電部１００の交流電源１０１の出力は、励起コイル１０２に印加される。励起コイル１０２は共鳴コイル１０３と近接しており、電磁誘導により共鳴コイル１０３に電力が誘起する。共鳴コイル１０３は受電部２００の共鳴コイル２０１と磁界共鳴の関係にあり、共鳴コイル１０３を励振した電力は、受電部２００の共鳴コイル２０１も励振する。共鳴コイル間が磁界共鳴の関係にある場合には、図２に示すように、ある特定の共鳴周波数では、共鳴コイルの高いＱ値により高効率で電力を送ることができる。共鳴コイル２０１は励起コイル２０２と電磁誘導で結合しており、共鳴コイル２０１を励振した電力は、励起コイル２０２に印加される。励起コイル２０２で誘起された電力は、整流回路２０３で直流成分に変換され、充電器や回路の電源に供給される。 FIG. 9 shows a configuration example of a conventional resonance type wireless power transmission apparatus.
In FIG. 9, the output of the AC power supply 101 of the power transmission unit 100 is applied to the excitation coil 102. The excitation coil 102 is close to the resonance coil 103, and electric power is induced in the resonance coil 103 by electromagnetic induction. The resonance coil 103 is in a magnetic field resonance relationship with the resonance coil 201 of the power reception unit 200, and the power that excites the resonance coil 103 also excites the resonance coil 201 of the power reception unit 200. When the resonance coils are in a magnetic resonance relationship, as shown in FIG. 2, at a specific resonance frequency, power can be transmitted with high efficiency due to the high Q value of the resonance coils. The resonance coil 201 is coupled to the excitation coil 202 by electromagnetic induction, and the electric power that excites the resonance coil 201 is applied to the excitation coil 202. The electric power induced by the excitation coil 202 is converted into a direct current component by the rectifier circuit 203 and supplied to the power supply of the charger and the circuit.

Andre Kurs, et al.“Wireless Power Transfer via Strongly Coupled Magnetic Resonances, ” Science, Vol.317, pp.83-85, 2007.Andre Kurs, et al. “Wireless Power Transfer via Strongly Coupled Magnetic Resonances,” Science, Vol.317, pp.83-85, 2007. Aristeidis Karalis, et al.“Efficient wireless non-radiative mid-range energy transfer, ” Annals of Physics, Vol.323, No.1, pp.34-48, Apr. 2007.Aristeidis Karalis, et al. “Efficient wireless non-radiative mid-range energy transfer,” Annals of Physics, Vol.323, No.1, pp.34-48, Apr. 2007.

共鳴コイル間が磁界共鳴の関係となる単純な条件は、送電部と受電部の共鳴コイルの容量とインダクタンスが互いに等しい場合である。しかし、共鳴コイルの形状誤差や経年劣化などから、これらの値が設計値から変動することが予想される。この場合には、元来図２の特性であったものに対して、図３に示すように、共鳴周波数がシフトするとともに送電効率も劣化する。このような共鳴周波数の変動と送電効率の劣化を抑制するために、共鳴コイル間で形状などを調整して容量とインダクタンス値を等しくする方法が考えられるが、装置などに実装した後の調整は難しいと考えられる。   A simple condition for the magnetic field resonance between the resonance coils is when the capacitance and inductance of the resonance coils of the power transmission unit and the power reception unit are equal to each other. However, these values are expected to fluctuate from the design values due to the shape error of the resonance coil and aging deterioration. In this case, as shown in FIG. 3, the resonance frequency is shifted and the power transmission efficiency is deteriorated as compared with the characteristic originally shown in FIG. In order to suppress such fluctuations in resonance frequency and deterioration in power transmission efficiency, a method of adjusting the shape and the like between resonance coils to make the capacitance and inductance values equal can be considered. It seems difficult.

本発明は、送電部と受電部の共鳴コイル間で容量とインダクタンスが異なる場合に、送電部だけの簡易な調整により、送電効率の改善と共鳴周波数を調整することができる共鳴型無線電力伝送装置および共鳴型無線電力伝送方法を提供することを目的とする。   The present invention relates to a resonance type wireless power transmission device capable of improving power transmission efficiency and adjusting a resonance frequency by simple adjustment of only the power transmission unit when the capacity and inductance are different between the resonance coils of the power transmission unit and the power reception unit. It is another object of the present invention to provide a resonance type wireless power transmission method.

第１の発明は、送電部の共振部と受電部の共振部が磁界共鳴の関係にあり、送電部から受電部に電力を無線送電する共鳴型無線電力伝送装置において、送電部は、周波数が異なる交流電力を出力する可変周波数電源と、可変周波数電源の交流電力を印加する励起コイルと、少なくとも一方の値が可変設定できるインダクタンスおよび容量から構成され、励起コイルに近接して電磁誘導により励起コイルに印加された交流電力を誘起する共振部と、励起コイルの入力電力の振幅と位相を検出する第１の電力検出手段と、励起コイルの反射電力の振幅と位相を検出する第２の電力検出手段と、第１の電力検出手段と第２の電力検出手段の出力から、可変周波数電源の周波数における可変周波数電源からみた入力インピーダンスを算出し、当該入力インピーダンスに応じて可変周波数電源の周波数と、インダクタンスの値または容量の値を調整する制御部とを備え、受電部は、インダクタンスおよび容量から構成される共振部と、当該共振部と近接して当該共振部に励振された交流電力を電磁誘導により誘起する励起コイルと、当該励起コイルに誘起された交流電力を直流電力に変換する整流回路とを備える。 According to a first aspect of the present invention, there is provided a resonance type wireless power transmission apparatus that wirelessly transmits power from a power transmission unit to a power reception unit. It consists of a variable frequency power supply that outputs different AC power, an excitation coil that applies AC power from the variable frequency power supply, and an inductance and a capacitance that can be variably set at least one of the values. A resonating unit for inducing AC power applied to the power source, first power detection means for detecting the amplitude and phase of the input power of the excitation coil, and second power detection for detecting the amplitude and phase of the reflected power of the excitation coil And the input impedance of the variable frequency power supply as seen from the variable frequency power supply is calculated from the outputs of the first power detection means and the second power detection means, and the input A control unit that adjusts the frequency of the variable frequency power supply according to the impedance and the value of the inductance or the capacitance, and the power receiving unit includes a resonance unit including an inductance and a capacitance, and a proximity unit of the resonance unit. An excitation coil that induces AC power excited in the resonance unit by electromagnetic induction, and a rectifier circuit that converts the AC power induced in the excitation coil into DC power.

第１の発明の共鳴型無線電力伝送装置における送電部の共振部は、インダクタンスの値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスを備え、送電部の制御部は、可変インダクタンスの値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変インダクタンスの値を設定して送電する構成である。 The resonance unit of the power transmission unit in the resonant wireless power transmission device according to the first aspect of the invention can variably set the value of the inductance, includes a variable inductance for adjusting the input impedance viewed from the variable frequency power source, and the control unit of the power transmission unit includes: The variable impedance value is changed discretely or continuously, and the frequency characteristics of the input impedance are calculated by discretely or continuously sweeping the frequency of the variable frequency power supply to calculate the imaginary part of the input impedance. Is set as the frequency of the variable frequency power supply, and the variable inductance value is set so that the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply are equal. It is a configuration for transmitting power.

第１の発明の共鳴型無線電力伝送装置における送電部の共振部は、容量の値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変容量を備え、送電部の制御部は、可変容量の値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変容量の値を設定して送電する構成である。 The resonance unit of the power transmission unit in the resonant wireless power transmission device according to the first aspect of the invention includes a variable capacitor that can variably set a capacitance value and is used for adjustment of input impedance viewed from a variable frequency power source. The variable capacitance value is changed discretely or continuously, and the frequency characteristics of the input impedance real and imaginary parts are calculated by discretely or continuously sweeping the frequency of the variable frequency power supply. Is set as the frequency of the variable frequency power supply, and the variable capacitance value is set so that the real part of the input impedance and the real part of the output impedance of the variable frequency power supply at the resonance frequency are equal. It is a configuration for transmitting power.

第１の発明の共鳴型無線電力伝送装置における送電部の共振部は、インダクタンスおよび容量の値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスおよび可変容量を備え、送電部の制御部は、可変インダクタンスおよび可変容量の値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変インダクタンスおよび可変容量の値を設定して送電する構成である。 The resonance unit of the power transmission unit in the resonant wireless power transmission device according to the first aspect of the invention includes a variable inductance and a variable capacitor that can variably set values of inductance and capacitance, and are used for adjustment of input impedance as viewed from a variable frequency power source. The control section of the control circuit changes the values of the variable inductance and variable capacitance discretely or continuously and sweeps the frequency of the variable frequency power supply discretely or continuously to obtain the frequency characteristics of the real and imaginary parts of the input impedance. Calculate and set the resonance frequency at which the imaginary part of the input impedance is zero as the frequency of the variable frequency power supply, so that the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply are equal. In this configuration, the values of variable inductance and variable capacitance are set and power is transmitted.

第２の発明は、送電部の共振部と受電部の共振部が磁界共鳴の関係にあり、送電部から受電部に電力を無線送電する共鳴型無線電力伝送方法において、送電部は、周波数が異なる交流電力を出力する可変周波数電源と、可変周波数電源の交流電力を印加する励起コイルと、少なくとも一方の値が可変設定できるインダクタンスおよび容量から構成され、励起コイルに近接して電磁誘導により励起コイルに印加された交流電力を誘起する共振部と、励起コイルの入力電力の振幅と位相を検出する第１の電力検出手段と、励起コイルの反射電力の振幅と位相を検出する第２の電力検出手段と、第１の電力検出手段と第２の電力検出手段の出力から、可変周波数電源の周波数における可変周波数電源からみた入力インピーダンスを算出し、当該入力インピーダンスに応じて可変周波数電源の周波数および入力インピーダンスを調整する制御部とを用いて送電を行い、受電部は、インダクタンスおよび容量から構成される共振部と、当該共振部と近接して当該共振部に励振された交流電力を電磁誘導により誘起する励起コイルと、当該励起コイルに誘起された交流電力を直流電力に変換する整流回路とを用いて受電を行い、送電部の共振部は、インダクタンスの値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスを用い、送電部の制御部は、可変インダクタンスの値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変インダクタンスの値を設定して送電する。 According to a second aspect of the present invention, there is provided a resonance type wireless power transmission method in which the resonance unit of the power transmission unit and the resonance unit of the power reception unit are in a magnetic field resonance relationship, and power is wirelessly transmitted from the power transmission unit to the power reception unit. It consists of a variable frequency power supply that outputs different AC power, an excitation coil that applies AC power from the variable frequency power supply, and an inductance and a capacitance that can be variably set at least one of the values. A resonating unit for inducing AC power applied to the power source, first power detection means for detecting the amplitude and phase of the input power of the excitation coil, and second power detection for detecting the amplitude and phase of the reflected power of the excitation coil And the input impedance of the variable frequency power supply as seen from the variable frequency power supply is calculated from the outputs of the first power detection means and the second power detection means, and the input Power is transmitted using a control unit that adjusts the frequency and input impedance of the variable frequency power supply according to impedance, and the power receiving unit includes a resonance unit including an inductance and a capacitor, and the resonance unit in proximity to the resonance unit. Power is received using an excitation coil that induces AC power excited by electromagnetic induction and a rectifier circuit that converts AC power induced in the excitation coil into DC power. The value can be variably set and the variable inductance used to adjust the input impedance viewed from the variable frequency power source is used. The control unit of the power transmission unit changes the value of the variable inductance discretely or continuously, and also changes the frequency of the variable frequency power source. The frequency characteristics of the real part and imaginary part of the input impedance are calculated by sweeping discretely or continuously, and the input impedance The resonance frequency at which the imaginary part of the impedance is zero is set as the frequency of the variable frequency power supply, and the variable inductance value is set so that the real part of the input impedance and the real part of the output impedance of the variable frequency power supply are equal at the resonance frequency. Set the power transmission.

第２の発明の共鳴型無線電力伝送方法における送電部の共振部は、可変インダクタンスに代えて、容量の値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変容量を用い、送電部の制御部は、可変容量の値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変容量の値を設定して送電する。 In the resonant wireless power transmission method according to the second aspect of the present invention, the resonance unit of the power transmission unit can variably set the capacitance value instead of the variable inductance, and uses a variable capacitor for adjusting the input impedance viewed from the variable frequency power source. The control unit of the unit changes the value of the variable capacitance discretely or continuously and sweeps the frequency of the variable frequency power supply discretely or continuously to calculate the frequency characteristics of the real part and imaginary part of the input impedance. , Set the resonance frequency at which the imaginary part of the input impedance is zero as the frequency of the variable frequency power supply, so that the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply are equal. Set the value of and transmit power.

第２の発明の共鳴型無線電力伝送方法における送電部の共振部は、可変インダクタンスに加えて、容量の値を可変設定でき、可変周波数電源からみた入力インピーダンスの調整に供する可変容量を用い、送電部の制御部は、可変インダクタンスおよび可変容量の値を離散的または連続的に変化させるとともに、可変周波数電源の周波数を離散的または連続的に掃引して入力インピーダンスの実部と虚部の周波数特性を算出し、入力インピーダンスの虚部がゼロとなる共鳴周波数を可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と可変周波数電源の出力インピーダンスの実部が等しくなるように、可変インダクタンスおよび可変容量の値を設定して送電する。
In the resonance type wireless power transmission method of the second invention, the resonance unit of the power transmission unit can variably set the capacitance value in addition to the variable inductance, and uses a variable capacitor for adjusting the input impedance viewed from the variable frequency power source. The control unit of the unit changes the values of the variable inductance and variable capacitance discretely or continuously, and also sweeps the frequency of the variable frequency power supply discretely or continuously, and the frequency characteristics of the real part and imaginary part of the input impedance The resonance frequency at which the imaginary part of the input impedance is zero is set as the frequency of the variable frequency power supply so that the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply are equal. Then, the variable inductance and the variable capacitance are set to transmit power.

本発明は、送電部と受電部の入出力インピーダンス、共振部間のインダクタンスや容量が一致していない場合に、送電部において、電源周波数を挿引して励起コイルの入力電力と反射電力の比と位相差を測定し、入力インピーダンスの実部と虚部の周波数特性を算出する。そして、入力インピーダンスの虚部がゼロとなる周波数（共鳴周波数）と、それに対応する入力インピーダンスの実部を求め、可変周波数電源の周波数と出力インピーダンスを調整し、あるいは共振部のインダクタンスと容量を適切な値に設定して入力インピーダンスを調整することにより、効率良く電力を送電部から受電部に送電することが可能となる。   In the present invention, when the input / output impedance of the power transmitting unit and the power receiving unit and the inductance and capacity between the resonant units do not match, in the power transmitting unit, the power frequency is inserted and the ratio of the input power of the excitation coil to the reflected power The phase difference is measured, and the frequency characteristics of the real part and imaginary part of the input impedance are calculated. Then, find the frequency at which the imaginary part of the input impedance becomes zero (resonance frequency) and the corresponding real part of the input impedance, adjust the frequency and output impedance of the variable frequency power supply, or properly adjust the inductance and capacity of the resonance part By adjusting the input impedance by setting to a proper value, it is possible to efficiently transmit power from the power transmission unit to the power reception unit.

本発明の共鳴型無線電力伝送装置の実施例構成を示す図である。It is a figure which shows the Example structure of the resonance-type wireless power transmission apparatus of this invention. 送電効率の周波数特性（共振部間のインダクタンスと容量が一致の場合）を示す図である。It is a figure which shows the frequency characteristic (when the inductance and capacity | capacitance between resonance parts correspond) of power transmission efficiency. 送電効率の周波数特性（共振部間のインダクタンスと容量が不一致の場合）を示す図である。It is a figure which shows the frequency characteristic (when the inductance and capacity | capacitance between resonance parts do not correspond) of power transmission efficiency. インピーダンス整合のための処理手順を示すフローチャートである。It is a flowchart which shows the process sequence for impedance matching. インピーダンス整合のための処理手順を説明する図である。It is a figure explaining the process sequence for impedance matching. 送電効率の周波数特性（出力インピーダンスの実部を調整した場合）を示す図である。It is a figure which shows the frequency characteristic (when the real part of output impedance is adjusted) of power transmission efficiency. インダクタンスの誤差と共鳴周波数における入力インピーダンスの関係を示す図である。It is a figure which shows the relationship between the error of an inductance, and the input impedance in a resonant frequency. 容量の誤差と共鳴周波数における入力インピーダンスの関係を示す図である。It is a figure which shows the relationship between the error of a capacity | capacitance, and the input impedance in a resonant frequency. 従来の共鳴型無線電力伝送装置の構成例を示す図である。It is a figure which shows the structural example of the conventional resonant type wireless power transmission apparatus.

図１は、本発明の共鳴型無線電力伝送装置の実施例構成を示す。
図１において、送電部１の可変周波数電源２は、離散的または連続的に周波数が異なる電力を出力する構成である。可変周波数電源２の出力電力の一部は、分配器３を介して電力検出器４に入力して振幅と位相が検出される。可変周波数電源２の出力電力の残りは、方向性結合器５を介して励起コイル６に印加される。可変インダクタンス７と可変容量８から構成される共振部９は、励起コイル６と近接しており、励起コイル６に印加された電力は、電磁誘導により共振部９を励振する。さらに共振部９は、受電部１０のインダクタンス１２と容量１３からなる共振部１１と磁界共鳴の関係にあり、図２に示すように、ある特定の周波数（共鳴周波数）では共振部の高いＱ値により送電部１と受電部２の結合効率が大きくなる。従って、送電部１は、可変周波数電源２の周波数を当該共鳴周波数に設定して受電部２に送電することにより、効率良く電力を伝送することが可能となる。このとき、共振部９で励振された共鳴周波数の電力は、受電部１０の共振部１１を高効率で励振する。共振部１１は励起コイル１４と近接しており、共振部１１を励振した電力は、電磁誘導により励起コイル１４に電力を誘起する。励起コイル１４に誘起された電力は、整流回路１５で直流成分に変換して出力される。 FIG. 1 shows an embodiment of a resonance type wireless power transmission apparatus according to the present invention.
In FIG. 1, the variable frequency power supply 2 of the power transmission unit 1 is configured to output power having different frequencies discretely or continuously. A part of the output power of the variable frequency power supply 2 is input to the power detector 4 via the distributor 3 to detect the amplitude and phase. The remainder of the output power of the variable frequency power supply 2 is applied to the excitation coil 6 via the directional coupler 5. The resonating unit 9 including the variable inductance 7 and the variable capacitor 8 is close to the excitation coil 6, and the power applied to the excitation coil 6 excites the resonating unit 9 by electromagnetic induction. Further, the resonance unit 9 is in a magnetic field resonance relationship with the resonance unit 11 including the inductance 12 and the capacitor 13 of the power reception unit 10, and as shown in FIG. 2, the resonance unit 9 has a high Q value at a specific frequency (resonance frequency). As a result, the coupling efficiency between the power transmitting unit 1 and the power receiving unit 2 is increased. Therefore, the power transmission unit 1 can transmit power efficiently by setting the frequency of the variable frequency power supply 2 to the resonance frequency and transmitting power to the power reception unit 2. At this time, the resonance frequency power excited by the resonance unit 9 excites the resonance unit 11 of the power reception unit 10 with high efficiency. The resonance unit 11 is close to the excitation coil 14, and the electric power that excites the resonance unit 11 induces electric power in the excitation coil 14 by electromagnetic induction. The electric power induced in the excitation coil 14 is converted into a DC component by the rectifier circuit 15 and output.

以下、図１の共鳴型無線電力伝送装置において、送電部１の可変周波数電源２の出力インピーダンスを調整する場合、送電部１の共振部９のインダクタンスを調整して可変周波数電源２からみた入力インピーダンスを調整する場合、送電部１の共振部９の容量を調整して可変周波数電源２からみた入力インピーダンスを調整する場合についてそれぞれ説明する。   1, when adjusting the output impedance of the variable frequency power source 2 of the power transmission unit 1 in the resonant wireless power transmission device of FIG. 1, the input impedance viewed from the variable frequency power source 2 by adjusting the inductance of the resonance unit 9 of the power transmission unit 1. When adjusting the input impedance viewed from the variable frequency power source 2 by adjusting the capacity of the resonance unit 9 of the power transmission unit 1 will be described.

（出力インピーダンスを調整する場合）
送電部１の共振部９と受電部１０の共振部１１が共鳴条件にない周波数の交流電力は、励起コイル６で反射する。この反射電力は、方向性結合器５を経由して電力検出器１６に入力する。電力検出器１６は、反射電力の振幅と位相を測定し、その結果を制御部１７に出力する。制御部１７は、電力検出器４で検出された励起コイル６の入力電力の振幅と位相と、電力検出器１６で検出された反射電力の振幅と位相とから入力インピーダンスを計算する。また、制御部１２は、入力インピーダンスの計算結果から、可変周波数電源２の周波数および出力インピーダンスを調整し、また共振部９のインダクタンスおよび容量をそれぞれ調整する（後者の調整方法の詳細については後述）。 (When adjusting the output impedance)
AC power having a frequency that does not satisfy the resonance conditions of the resonance unit 9 of the power transmission unit 1 and the resonance unit 11 of the power reception unit 10 is reflected by the excitation coil 6. This reflected power is input to the power detector 16 via the directional coupler 5. The power detector 16 measures the amplitude and phase of the reflected power and outputs the result to the control unit 17. The control unit 17 calculates the input impedance from the amplitude and phase of the input power of the excitation coil 6 detected by the power detector 4 and the amplitude and phase of the reflected power detected by the power detector 16. In addition, the control unit 12 adjusts the frequency and output impedance of the variable frequency power supply 2 from the calculation result of the input impedance, and adjusts the inductance and capacitance of the resonance unit 9 (details of the latter adjustment method will be described later). .

送信部１の共振部９と受電部１０の共振部１１が磁界共鳴の関係となる最も簡単な条件は、可変インダクタンス７とインダクタンス１２のインダクタンス値が一致し、可変容量８と容量１３の容量値が一致する場合である。しかし、製造過程での偏差、温度変化や経年劣化などにより、素子毎に容量値やインダクタンス値は異なるため、共振部９，１１間でインダクタンス値および容量値を常に一致させることは困難である。   The simplest condition in which the resonance unit 9 of the transmission unit 1 and the resonance unit 11 of the power reception unit 10 are in a magnetic resonance relationship is that the inductance values of the variable inductance 7 and the inductance 12 match, and the capacitance values of the variable capacitance 8 and the capacitance 13 Is the case. However, since the capacitance value and the inductance value are different for each element due to deviation in manufacturing process, temperature change, aging deterioration, and the like, it is difficult to always match the inductance value and the capacitance value between the resonance units 9 and 11.

例えば、共振部間でインダクタンス値および容量値がそれぞれ異なる場合、図３で示されるように、共鳴周波数での電力伝送効率は劣化する。これは、例えばマイクロ波回路における交流電源の一般的な出力インピーダンスを50Ωとしたとき、共鳴周波数における交流電源から見た入力インピーダンスの実部が50Ωではなくなっており、出力インピーダンスが50Ωの交流電源と整合が取れていないため、励起コイルで送電電力の一部が反射して電力伝送効率が劣化するためである。これに対し、交流電源の出力インピーダンスの実部を共鳴周波数における入力インピーダンスの実部に一致させた場合には、入力インピーダンスの虚部はゼロであり、入力インピーダンスと出力インピーダンスの整合が取れるため、電力伝送効率は改善される。   For example, when the inductance value and the capacitance value are different between the resonance parts, the power transmission efficiency at the resonance frequency is degraded as shown in FIG. For example, when the general output impedance of an AC power supply in a microwave circuit is 50Ω, the real part of the input impedance viewed from the AC power supply at the resonance frequency is not 50Ω, and the AC power supply with an output impedance of 50Ω This is because the power transmission efficiency deteriorates because a part of the transmitted power is reflected by the excitation coil because the matching is not achieved. On the other hand, when the real part of the output impedance of the AC power supply is matched with the real part of the input impedance at the resonance frequency, the imaginary part of the input impedance is zero, and the input impedance and the output impedance can be matched. The power transmission efficiency is improved.

図４は、インピーダンス整合のための処理手順を示す。
図４において、最初に可変周波数電源２の出力インピーダンスを50Ωに設定する（Ｓ１）。次に、可変周波数電源２の周波数を離散的または連続的に掃引し、励起コイル６に印加する（Ｓ２）。可変周波数電源２と励起コイル６の間には、分配器３と方向性結合器５が挿入されており、それぞれ励起コイル６への入力電力と励起コイル６からの反射電力が電力検出部４，１６で測定され、制御部１７に入力する。制御部１７は、励起コイル６の入力電力と反射電力との振幅比Γと位相差 exp(jθ) を求める（Ｓ３）。次に、求めたΓとθから入力インピーダンスの実部Ｒと虚部Ｘを、以下の式から求める（Ｓ４）。
Ｒ＝50×（１−Γ2)／((１−Γcos(θ))2＋(Γsin(θ))2)
Ｘ＝50×（２Γsin(θ))／((１−Γcos(θ))2＋(Γsin(θ))2) FIG. 4 shows a processing procedure for impedance matching.
In FIG. 4, first, the output impedance of the variable frequency power supply 2 is set to 50Ω (S1). Next, the frequency of the variable frequency power supply 2 is swept discretely or continuously and applied to the excitation coil 6 (S2). A distributor 3 and a directional coupler 5 are inserted between the variable frequency power supply 2 and the excitation coil 6, and the input power to the excitation coil 6 and the reflected power from the excitation coil 6 are respectively detected by the power detection unit 4. 16 and is input to the control unit 17. The control unit 17 obtains the amplitude ratio Γ and the phase difference exp (jθ) between the input power and the reflected power of the excitation coil 6 (S3). Next, the real part R and the imaginary part X of the input impedance are obtained from the following equations (S4).
R = 50 × (1-Γ 2 ) / ((1-Γcos (θ)) 2 + (Γsin (θ)) 2 )
X = 50 × (2Γsin (θ)) / ((1-Γcos (θ)) 2 + (Γsin (θ)) 2 )

入力インピーダンスの虚部Ｘがゼロとなる周波数が共鳴周波数なので、図５で示すように、離散的または連続的にＸの周波数特性を測定し、線形近似などによりＸが０となる周波数を求めて共鳴周波数Ｆr とする（Ｓ５）。同様に、Ｓ４で求めた入力インピーダンスの実部Ｒの周波数特性から、Ｘが０すなわち共鳴周波数に対応する実部Ｒの値を線形近似などにより求めてＲr とする（Ｓ６）。最後に、可変周波数電源２の周波数を共鳴周波数Ｆr に、出力インピーダンスをＲr に再設定して、励起コイル６に入力する。図６の実線は、入出力インピーダンスの整合を取った場合である。入出力インピーダンスの整合を取った場合に、周波数が低い方の共鳴周波数で反射が低減されるため、伝送効率が改善される。   Since the frequency at which the imaginary part X of the input impedance becomes zero is the resonance frequency, as shown in FIG. 5, the frequency characteristics of X are measured discretely or continuously, and the frequency at which X becomes 0 is obtained by linear approximation or the like. The resonance frequency is Fr (S5). Similarly, from the frequency characteristic of the real part R of the input impedance obtained in S4, X is 0, that is, the value of the real part R corresponding to the resonance frequency is obtained by linear approximation or the like and is set as Rr (S6). Finally, the frequency of the variable frequency power supply 2 is reset to the resonance frequency Fr and the output impedance is set to Rr, and is input to the excitation coil 6. The solid line in FIG. 6 shows the case where the input / output impedance is matched. When the input / output impedance is matched, the reflection is reduced at the lower resonance frequency, so that the transmission efficiency is improved.

（インダクタンスを調整する場合）
送電部１の共振部９の可変インダクタンス７と、受電部１０の共振部１１のインダクタンス１２が一致していない場合に、整合を取って送電効率を改善する方法について説明する。 (When adjusting inductance)
A method for improving transmission efficiency by matching when the variable inductance 7 of the resonance unit 9 of the power transmission unit 1 and the inductance 12 of the resonance unit 11 of the power reception unit 10 do not match will be described.

前述と同様に可変周波数電源２の周波数を挿引するとともに、可変インダクタンス７を変化させて入力インピーダンスの実部と虚部を求める。インダクタンスの誤差が生じている場合には、図７に示すように、共鳴周波数における入力インピーダンスの実数部が50Ωからずれる。従って、共鳴周波数における入力インピーダンスの実数部が50Ωとなるように、可変インダクタンス７の値を調整することで、整合が取れて送電効率を高くすることが可能となる。   Similarly to the above, the frequency of the variable frequency power supply 2 is inserted and the variable inductance 7 is changed to obtain the real part and the imaginary part of the input impedance. If an inductance error occurs, the real part of the input impedance at the resonance frequency deviates from 50Ω as shown in FIG. Therefore, by adjusting the value of the variable inductance 7 so that the real part of the input impedance at the resonance frequency is 50Ω, it is possible to achieve matching and increase the power transmission efficiency.

具体的には、可変周波数電源２の周波数を離散的に掃引しながら、周波数ごとにＸ＝０となる可変インダクタンス７の値とそのときのＲの値を取得する。この結果により、Ｒが50Ωに最も近くなる可変インダクタンス７の値を線形近似等により算出し、その値に対応する周波数を特定する。以上により得られた可変インダクタンス７の値と可変周波数電源２の周波数を、それ以降の設定値とする。   Specifically, while sweeping the frequency of the variable frequency power supply 2 in a discrete manner, the value of the variable inductance 7 where X = 0 and the value of R at that time are acquired for each frequency. Based on this result, the value of the variable inductance 7 where R is closest to 50Ω is calculated by linear approximation or the like, and the frequency corresponding to the value is specified. The value of the variable inductance 7 and the frequency of the variable frequency power source 2 obtained as described above are set as the subsequent set values.

（容量を調整する場合）
送電部１の共振部９の可変容量８と、受電部１０の共振部１１の容量１３が一致していない場合に、整合を取って送電効率を改善する方法について説明する。 (When adjusting the capacity)
A method for improving transmission efficiency by matching when the variable capacitor 8 of the resonance unit 9 of the power transmission unit 1 and the capacitance 13 of the resonance unit 11 of the power reception unit 10 do not match will be described.

インダクタンスの場合と同様に可変周波数電源２の周波数を挿引するとともに、可変容量８を変化させて入力インピーダンスの実部と虚部を求める。容量の誤差が生じている場合には、図８に示すように、共鳴周波数における入力インピーダンスの実数部が50Ωからずれる。従って、共鳴周波数における入力インピーダンスの実数部が50Ωとなるように、可変容量８の値を調整することで、整合が取れて送電効率を高くすることが可能となる。   Similarly to the case of the inductance, the frequency of the variable frequency power supply 2 is inserted and the variable capacitor 8 is changed to obtain the real part and the imaginary part of the input impedance. When a capacitance error occurs, the real part of the input impedance at the resonance frequency deviates from 50Ω as shown in FIG. Therefore, by adjusting the value of the variable capacitor 8 so that the real part of the input impedance at the resonance frequency is 50Ω, it is possible to achieve matching and increase the power transmission efficiency.

具体的には、可変周波数電源２の周波数を離散的に変更しながら、周波数ごとにＸ＝０となる可変容量８の値とそのときのＲの値を取得する。この結果により、Ｒが50Ωに最も近くなる可変容量８の値を線形近似等により算出し、その値に対応する周波数を特定する。以上により得られた可変容量８の値と可変周波数電源２の周波数を、それ以降の設定値とする。   Specifically, while changing the frequency of the variable frequency power supply 2 discretely, the value of the variable capacitor 8 where X = 0 and the value of R at that time are acquired for each frequency. Based on this result, the value of the variable capacitor 8 where R is closest to 50Ω is calculated by linear approximation or the like, and the frequency corresponding to the value is specified. The value of the variable capacitor 8 and the frequency of the variable frequency power source 2 obtained as described above are set as the subsequent set values.

なお、インダクタンスと容量の双方が可変である場合には、周波数ごとにインダクタンスと容量の組合せについて、周波数ごとにＸ＝０となる当該組合せの値とそのときのＲの値を取得してもよい。このようにすることで、例えば可変インダクタンス７と可変容量８の設定範囲の狭い素子を使用する場合等にも対応ができるようになる。   When both the inductance and the capacity are variable, for the combination of the inductance and the capacity for each frequency, the value of the combination where X = 0 for each frequency and the value of R at that time may be acquired. . By doing so, for example, it is possible to cope with a case where an element having a narrow setting range of the variable inductance 7 and the variable capacitor 8 is used.

１，１００ 送電部
２ 可変周波数電源
３ 分配器
４，１６ 電力検出器
５ 方向性結合器
６，１４，１０２，２０２ 励起コイル
７ 可変インダクタンス
８ 可変容量
９，１１ 共振部
１０，２００ 受電部
１２ インダクタンス
１３ 容量
１５，２０３ 整流回路
１７ 制御部
１０１ 交流電源
１０３，２０１ 共鳴コイル DESCRIPTION OF SYMBOLS 1,100 Power transmission part 2 Variable frequency power supply 3 Divider 4,16 Power detector 5 Directional coupler 6,14,102,202 Excitation coil 7 Variable inductance 8 Variable capacity 9,11 Resonance part 10,200 Power receiving part 12 Inductance 13 Capacitance 15, 203 Rectifier circuit 17 Control unit 101 AC power source 103, 201 Resonance coil

Claims (7)

送電部の共振部と受電部の共振部が磁界共鳴の関係にあり、送電部から受電部に電力を無線送電する共鳴型無線電力伝送装置において、
前記送電部は、周波数が異なる交流電力を出力する可変周波数電源と、前記可変周波数電源の交流電力を印加する励起コイルと、少なくとも一方の値が可変設定できるインダクタンスおよび容量から構成され、前記励起コイルに近接して電磁誘導により前記励起コイルに印加された交流電力を誘起する共振部と、前記励起コイルの入力電力の振幅と位相を検出する第１の電力検出手段と、前記励起コイルの反射電力の振幅と位相を検出する第２の電力検出手段と、前記第１の電力検出手段と前記第２の電力検出手段の出力から、前記可変周波数電源の周波数における前記可変周波数電源からみた入力インピーダンスを算出し、当該入力インピーダンスに応じて前記可変周波数電源の周波数と、前記インダクタンスの値または前記容量の値を調整する制御部とを備え、
前記受電部は、インダクタンスおよび容量から構成される共振部と、当該共振部と近接して当該共振部に励振された交流電力を電磁誘導により誘起する励起コイルと、当該励起コイルに誘起された交流電力を直流電力に変換する整流回路とを備えた
ことを特徴とする共鳴型無線電力伝送装置。 In the resonance-type wireless power transmission device that wirelessly transmits power from the power transmission unit to the power reception unit, the resonance unit of the power transmission unit and the resonance unit of the power reception unit are in a magnetic resonance relationship.
The power transmission unit includes a variable frequency power source that outputs AC power having different frequencies, an excitation coil that applies AC power of the variable frequency power source, and an inductance and a capacitance that can be variably set at least one of the values. A resonance unit for inducing alternating current power applied to the excitation coil by electromagnetic induction in the vicinity of the power source, first power detection means for detecting the amplitude and phase of the input power of the excitation coil, and the reflected power of the excitation coil Input impedance viewed from the variable frequency power source at the frequency of the variable frequency power source from the output of the second power detecting unit for detecting the amplitude and phase of the first power detecting unit, the first power detecting unit and the second power detecting unit The frequency of the variable frequency power supply and the inductance value or the capacitance value are adjusted according to the input impedance. And a control unit which,
The power receiving unit includes a resonance unit composed of an inductance and a capacitor, an excitation coil that induces AC power excited by the resonance unit in the vicinity of the resonance unit by electromagnetic induction, and an AC induced by the excitation coil A resonance type wireless power transmission device comprising: a rectifier circuit that converts electric power into DC power. 請求項１に記載の共鳴型無線電力伝送装置において、
前記送電部の共振部は、前記インダクタンスの値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスを備え、
前記送電部の制御部は、前記可変インダクタンスの値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変インダクタンスの値を設定して送電する構成である
ことを特徴とする共鳴型無線電力伝送装置。 In the resonance type wireless power transmission device according to claim 1 ,
The resonance unit of the power transmission unit can variably set the value of the inductance, and includes a variable inductance used for adjustment of input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit changes the value of the variable inductance discretely or continuously, and sweeps the frequency of the variable frequency power source discretely or continuously to obtain a real part and an imaginary part of the input impedance. The frequency characteristic is calculated, the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply The resonance-type wireless power transmission device is configured to transmit power by setting the value of the variable inductance so that the two are equal. 請求項１に記載の共鳴型無線電力伝送装置において、
前記送電部の共振部は、前記容量の値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変容量を備え、
前記送電部の制御部は、前記可変容量の値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変容量の値を設定して送電する構成である
ことを特徴とする共鳴型無線電力伝送装置。 In the resonance type wireless power transmission device according to claim 1 ,
The resonance unit of the power transmission unit can variably set the value of the capacitance, and includes a variable capacitor for adjusting input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit changes the value of the variable capacitance discretely or continuously, and sweeps the frequency of the variable frequency power source discretely or continuously to obtain a real part and an imaginary part of the input impedance. The frequency characteristic is calculated, the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply The resonance type wireless power transmission device is configured to transmit the power by setting the value of the variable capacity so that the two are equal. 請求項１に記載の共鳴型無線電力伝送装置において、
前記送電部の共振部は、前記インダクタンスおよび前記容量の値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスおよび可変容量を備え、
前記送電部の制御部は、前記可変インダクタンスおよび前記可変容量の値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変インダクタンスおよび前記可変容量の値を設定して送電する構成である
ことを特徴とする共鳴型無線電力伝送装置。 In the resonance type wireless power transmission device according to claim 1 ,
The resonance unit of the power transmission unit can variably set the values of the inductance and the capacitance, and includes a variable inductance and a variable capacitance used for adjusting an input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit discretely or continuously changes the values of the variable inductance and the variable capacitance, and also sweeps the frequency of the variable frequency power source discretely or continuously, thereby real part of the input impedance. And the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, and the real part of the input impedance at the resonance frequency and the output of the variable frequency power supply A resonance type wireless power transmission apparatus configured to transmit power by setting values of the variable inductance and the variable capacitance so that real parts of impedance are equal. 送電部の共振部と受電部の共振部が磁界共鳴の関係にあり、送電部から受電部に電力を無線送電する共鳴型無線電力伝送方法において、
前記送電部は、周波数が異なる交流電力を出力する可変周波数電源と、前記可変周波数電源の交流電力を印加する励起コイルと、少なくとも一方の値が可変設定できるインダクタンスおよび容量から構成され、前記励起コイルに近接して電磁誘導により前記励起コイルに印加された交流電力を誘起する共振部と、前記励起コイルの入力電力の振幅と位相を検出する第１の電力検出手段と、前記励起コイルの反射電力の振幅と位相を検出する第２の電力検出手段と、前記第１の電力検出手段と前記第２の電力検出手段の出力から、前記可変周波数電源の周波数における前記可変周波数電源からみた入力インピーダンスを算出し、当該入力インピーダンスに応じて前記可変周波数電源の周波数および入力インピーダンスを調整する制御部とを用いて送電を行い、
前記受電部は、インダクタンスおよび容量から構成される共振部と、当該共振部と近接して当該共振部に励振された交流電力を電磁誘導により誘起する励起コイルと、当該励起コイルに誘起された交流電力を直流電力に変換する整流回路とを用いて受電を行い、
前記送電部の共振部は、前記インダクタンスの値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変インダクタンスを用い、
前記送電部の制御部は、前記可変インダクタンスの値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変インダクタンスの値を設定して送電する
ことを特徴とする共鳴型無線電力伝送方法。 In the resonance type wireless power transmission method in which the resonance unit of the power transmission unit and the resonance unit of the power reception unit are in a magnetic resonance relationship, and wirelessly transmits power from the power transmission unit to the power reception unit,
The power transmission unit includes a variable frequency power source that outputs AC power having different frequencies, an excitation coil that applies AC power of the variable frequency power source, and an inductance and a capacitance that can be variably set at least one of the values. A resonance unit for inducing alternating current power applied to the excitation coil by electromagnetic induction in the vicinity of the power source, first power detection means for detecting the amplitude and phase of the input power of the excitation coil, and the reflected power of the excitation coil Input impedance viewed from the variable frequency power source at the frequency of the variable frequency power source from the output of the second power detecting unit for detecting the amplitude and phase of the first power detecting unit, the first power detecting unit and the second power detecting unit Using a control unit that calculates and adjusts the frequency and input impedance of the variable frequency power supply according to the input impedance It performs a power transmission,
The power receiving unit includes a resonance unit composed of an inductance and a capacitor, an excitation coil that induces AC power excited by the resonance unit in the vicinity of the resonance unit by electromagnetic induction, and an AC induced by the excitation coil Receiving power using a rectifier circuit that converts power to DC power,
The resonance unit of the power transmission unit can variably set the value of the inductance, and uses a variable inductance for adjustment of input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit changes the value of the variable inductance discretely or continuously, and sweeps the frequency of the variable frequency power source discretely or continuously to obtain a real part and an imaginary part of the input impedance. The frequency characteristic is calculated, the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply The resonance-type wireless power transmission method is characterized in that the variable inductance value is set so as to be equal to each other for power transmission. 請求項５に記載の共鳴型無線電力伝送方法において、
前記送電部の共振部は、前記可変インダクタンスに代えて、前記容量の値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変容量を用い、
前記送電部の制御部は、前記可変容量の値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変容量の値を設定して送電する
ことを特徴とする共鳴型無線電力伝送方法。 In the resonance type wireless power transmission method according to claim 5 ,
Instead of the variable inductance, the resonance unit of the power transmission unit can variably set the value of the capacitance, and uses a variable capacitor for adjustment of input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit changes the value of the variable capacitance discretely or continuously, and sweeps the frequency of the variable frequency power source discretely or continuously to obtain a real part and an imaginary part of the input impedance. The frequency characteristic is calculated, the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, the real part of the input impedance at the resonance frequency and the real part of the output impedance of the variable frequency power supply The resonance-type wireless power transmission method is characterized in that power is transmitted by setting the value of the variable capacity so that the two are equal. 請求項５に記載の共鳴型無線電力伝送方法において、
前記送電部の共振部は、前記可変インダクタンスに加えて、前記容量の値を可変設定でき、前記可変周波数電源からみた入力インピーダンスの調整に供する可変容量を用い、
前記送電部の制御部は、前記可変インダクタンスおよび前記可変容量の値を離散的または連続的に変化させるとともに、前記可変周波数電源の周波数を離散的または連続的に掃引して前記入力インピーダンスの実部と虚部の周波数特性を算出し、前記入力インピーダンスの虚部がゼロとなる共鳴周波数を前記可変周波数電源の周波数として設定し、当該共鳴周波数での入力インピーダンスの実部と前記可変周波数電源の出力インピーダンスの実部が等しくなるように、前記可変インダクタンスおよび前記可変容量の値を設定して送電する
ことを特徴とする共鳴型無線電力伝送方法。 In the resonance type wireless power transmission method according to claim 5 ,
In addition to the variable inductance, the resonance unit of the power transmission unit can variably set the value of the capacitance, and uses a variable capacitor for adjusting the input impedance viewed from the variable frequency power source,
The control unit of the power transmission unit discretely or continuously changes the values of the variable inductance and the variable capacitance, and also sweeps the frequency of the variable frequency power source discretely or continuously, thereby real part of the input impedance. And the resonance frequency at which the imaginary part of the input impedance becomes zero is set as the frequency of the variable frequency power supply, and the real part of the input impedance at the resonance frequency and the output of the variable frequency power supply Resonance type wireless power transmission method, wherein power is transmitted by setting values of said variable inductance and said variable capacitance so that real parts of impedance are equal.
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