JP5612956B2 - Non-contact power transmission device - Google Patents

Non-contact power transmission device Download PDF

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JP5612956B2
JP5612956B2 JP2010175261A JP2010175261A JP5612956B2 JP 5612956 B2 JP5612956 B2 JP 5612956B2 JP 2010175261 A JP2010175261 A JP 2010175261A JP 2010175261 A JP2010175261 A JP 2010175261A JP 5612956 B2 JP5612956 B2 JP 5612956B2
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堀内　晴宏
晴宏 堀内
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Yazaki Corp
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Description

本発明は、電磁誘導作用によって一次側回路から二次側回路に電力を伝送する非接触電力伝送装置に関するものである。   The present invention relates to a non-contact power transmission device that transmits power from a primary circuit to a secondary circuit by electromagnetic induction.

従来の非接触電力伝送装置として、例えば、特許文献１に開示された、図８に示すワイヤレス伝送装置（図中、符号９０１で示す）がある。このワイヤレス伝送装置９０１は、一次側回路装置９３０と、二次側回路装置９５０と、で構成されている。一次側回路装置９３０は、電力誘導コイル９０３の一端と電力電源９０２の一方の出力端とに接続された共振キャパシタ９５１を備えている。二次側回路装置９５０は、電力受信コイル９０４に並列に接続された共振キャパシタ９５２を備えている。   As a conventional non-contact power transmission apparatus, for example, there is a wireless transmission apparatus (indicated by reference numeral 901 in the figure) disclosed in Patent Document 1 and shown in FIG. The wireless transmission device 901 includes a primary side circuit device 930 and a secondary side circuit device 950. The primary side circuit device 930 includes a resonance capacitor 951 connected to one end of the power induction coil 903 and one output end of the power source 902. The secondary circuit device 950 includes a resonance capacitor 952 connected in parallel to the power receiving coil 904.

そして、一次側回路装置９３０において、以下の式（ｉ）を満たし、二次側回路装置９５０において、以下の式（ｉｉ）を満たすように各回路構成部材のパラメータを設定することにより、各回路装置において共振状態を生じさせて、電力を二次側回路装置９５０に供給していた。
ωＬ1−１／（ωＣ1）＝０（即ち、ｆ＝１／（２π√（Ｌ1Ｃ1））・・・（ｉ）
ωＬ2−１／（ωＣ2）＝０（即ち、ｆ＝１／（２π√（Ｌ2Ｃ2））・・・（ｉｉ）
但し、ω＝２πｆ、Ｌ1は電力誘導コイル９０３の自己インダクタンス、Ｃ1は共振キャパシタ９５１の静電容量、Ｌ2は電力受信コイル９０４の自己インダクタンス、Ｃ2は共振キャパシタ９５２の静電容量、ｆは電源周波数である。 In the primary side circuit device 930, the following equation (i) is satisfied, and in the secondary side circuit device 950, the parameters of the respective circuit components are set so as to satisfy the following equation (ii). A resonance state was generated in the device, and power was supplied to the secondary circuit device 950.
ωL 1 −1 / (ωC 1 ) = 0 (ie, f = 1 / (2π√ (L 1 C 1 )) (i)
ωL 2 −1 / (ωC 2 ) = 0 (that is, f = 1 / (2π√ (L 2 C 2 )) (ii)
Where ω = 2πf, L 1 is the self-inductance of the power induction coil 903, C 1 is the capacitance of the resonant capacitor 951, L 2 is the self-inductance of the power receiving coil 904, and C 2 is the capacitance of the resonant capacitor 952. f is a power supply frequency.

特開平１０−３２２２４７号公報Japanese Patent Laid-Open No. 10-322247

しかしながら、二次側回路装置９５０においては、整流回路９０５、平滑キャパシタ９１３及び二次側負荷９０６などから構成される負荷が電力受信コイル９０４に直列に接続されているところ、上記式（ｉｉ）では、これら負荷のインピーダンスが考慮されていないので、この式（ｉｉ）を満たすように、電力受信コイル９０４の自己インダクタンスＬ2及び共振キャパシタ９５２の静電容量Ｃ2を設定しても、二次側回路装置９５０全体として共振状態にはならず、つまり、電力受信コイル９０４のリアクタンス等が残存してしまい、そのため、インピーダンスを整合できず、電力伝送効率が低下してしまうという問題があった。 However, in the secondary side circuit device 950, a load composed of the rectifier circuit 905, the smoothing capacitor 913, the secondary side load 906, and the like is connected in series to the power receiving coil 904. In the above equation (ii), Since the impedance of these loads is not taken into consideration, even if the self-inductance L 2 of the power receiving coil 904 and the capacitance C 2 of the resonant capacitor 952 are set so as to satisfy this equation (ii), the secondary side There is a problem that the circuit device 950 does not resonate as a whole, that is, reactance of the power receiving coil 904 remains, so that impedance cannot be matched and power transmission efficiency is reduced.

本発明は、上記課題に係る問題を解決することを目的としている。即ち、本発明は、二次側回路を共振状態にして電力伝送効率を高めることができる非接触電力伝送装置を提供することを目的としている。   The present invention aims to solve the above problems. That is, an object of the present invention is to provide a non-contact power transmission device capable of increasing the power transmission efficiency by bringing the secondary side circuit into a resonance state.

請求項１に記載された発明は、上記目的を達成するために、交流電源による電力を電磁誘導作用によって送信する送電コイルを有する一次側回路ユニットと、前記送電コイルから送信された前記電力を受信する受電コイルと該受電コイルに直列接続された負荷とを有する二次側回路ユニットと、を有する非接触電力伝送装置において、前記二次側回路ユニットが、前記受電コイルに並列に存在する静電容量ＣP2を有し、前記静電容量Ｃ P2 が、前記受電コイルの寄生静電容量によるものであり、そして、前記静電容量ＣP2が、以下の式（Ａ）を満たすことを特徴とする非接触電力伝送装置である。
ＣP2＝（Ｚ0±√（Ｚ0 2−４ω2Ｌ2 2））／２ω2Ｚ0Ｌ2 ・・・（Ａ）
但し、Ｚ0≧２ωＬ2、ω＝２πｆ、Ｚ0は前記負荷のインピーダンス［Ω］、ωは角速度［ｒａｄ／秒］、Ｌ2は前記受電コイルの自己インダクタンス［Ｈ］、ｆは前記交流電源の周波数［Ｈｚ］である。 In order to achieve the above object, the invention described in claim 1 receives a primary side circuit unit having a power transmission coil for transmitting power from an AC power source by electromagnetic induction and the power transmitted from the power transmission coil. A non-contact power transmission device having a power receiving coil and a secondary circuit unit having a load connected in series with the power receiving coil, wherein the secondary circuit unit exists in parallel with the power receiving coil. A capacitance C P2 , wherein the capacitance C P2 is due to a parasitic capacitance of the power receiving coil, and the capacitance C P2 satisfies the following formula (A): This is a non-contact power transmission device.
C P2 = (Z 0 ± √ (Z 0 2 -4ω 2 L 2 2 )) / 2ω 2 Z 0 L 2 (A)
However, Z 0 ≧ 2ωL 2 , ω = 2πf, Z 0 is the impedance [Ω] of the load, ω is the angular velocity [rad / sec], L 2 is the self-inductance [H] of the power receiving coil, and f is the AC power source. [Hz].

請求項２に記載された発明は、請求項１に記載された発明において、前記送電コイルの巻き数と前記受電コイルの巻き数との巻き数比ｎが、以下の式（Ｂ）を満たすことを特徴とするものである。
ｎ＝Ｎ1／Ｎ2≧１ ・・・（Ｂ）
但し、Ｎ1が前記送電コイルの巻き数［回］、Ｎ2が前記受電コイルの巻き数［回］である。 The invention described in claim 2 is the invention described in claim 1 , wherein a winding ratio n between the number of turns of the power transmission coil and the number of turns of the power receiving coil satisfies the following formula (B). It is characterized by.
n = N 1 / N 2 ≧ 1 (B)
N 1 is the number of turns of the power transmission coil [times], and N 2 is the number of turns of the power receiving coil [ times].

請求項１に記載された発明によれば、二次側回路ユニットが、受電コイルに並列に存在する静電容量ＣP2を有し、そして、この静電容量ＣP2が、上記式（Ａ）を満たすので、受電コイルに直列に接続された負荷を含めた二次側回路ユニット全体で共振状態にすることができ、そのため、受電コイルのリアクタンス等を打ち消すことができ、インピーダンスを整合させて電力伝送効率を高めることができる。 According to the first aspect of the present invention, the secondary circuit unit has the capacitance C P2 existing in parallel with the power receiving coil, and the capacitance C P2 is expressed by the above formula (A). Therefore, the entire secondary side circuit unit including the load connected in series with the power receiving coil can be brought into a resonance state, so that the reactance of the power receiving coil can be canceled and the impedance can be matched and the power can be reduced. Transmission efficiency can be increased.

また、請求項１に記載された発明によれば、静電容量ＣP2が、受電コイルの寄生静電容量によるものであるので、部品を追加することなく、簡素な構成で電力伝送効率を高めることができる。 Further, according to the invention described in claim 1, the capacitance C P2 is, since due to the parasitic capacitance of the power receiving coil, without additional components, increasing the power transmission efficiency with a simple structure be able to.

請求項２に記載された発明によれば、送電コイルの巻き数と受電コイルの巻き数との巻き数比が、上記式（Ｂ）を満たすので、巻き数比を調整することによりインピーダンス整合を容易に行うことができるとともに、受電コイルの巻き数を小さくして二次側回路ユニットを軽量化することができる。 According to the invention described in claim 2 , since the turn ratio between the number of turns of the power transmission coil and the number of turns of the power receiving coil satisfies the above formula (B), impedance matching is achieved by adjusting the turn ratio. This can be easily performed, and the number of turns of the power receiving coil can be reduced to reduce the weight of the secondary circuit unit.

本発明に係る非接触電力伝送装置の一実施形態の回路図である。It is a circuit diagram of one embodiment of a non-contact power transmission device concerning the present invention. 図１の非接触電力伝送装置に用いられる受電コイルにおける巻き数と自己インダクタンスとの関係を示すグラフである。It is a graph which shows the relationship between the winding number in a receiving coil used for the non-contact electric power transmission apparatus of FIG. 1, and a self-inductance. 図１の非接触電力伝送装置の変形例の構成を示す回路図である。It is a circuit diagram which shows the structure of the modification of the non-contact electric power transmission apparatus of FIG. 図１の非接触電力伝送装置において、二次側回路ユニットが備える共振キャパシタを、受電コイルと負荷との間に直列に接続した構成を示す回路図である。FIG. 2 is a circuit diagram showing a configuration in which a resonance capacitor included in a secondary circuit unit is connected in series between a power receiving coil and a load in the non-contact power transmission apparatus of FIG. 1. 図１の非接触電力伝送装置において、一次側回路ユニットが備える共振キャパシタを、交流電源と並列に接続し、且つ、二次側回路ユニットが備える共振キャパシタを、受電コイルと負荷との間に直列に接続した構成を示す回路図である。In the non-contact power transmission apparatus of FIG. 1, the resonance capacitor provided in the primary circuit unit is connected in parallel with the AC power supply, and the resonance capacitor provided in the secondary circuit unit is connected in series between the power receiving coil and the load. It is a circuit diagram which shows the structure connected to. 共振キャパシタの接続形態が異なる複数の非接触電力伝送装置における、送電コイル及び受電コイルの間隔と電力伝送効率との関係を示すグラフである。It is a graph which shows the relationship between the space | interval of a power transmission coil and a receiving coil, and power transmission efficiency in the some non-contact electric power transmission apparatus from which the connection form of a resonant capacitor differs. コイルの巻き数が異なる複数の非接触電力伝送装置における、送電コイル及び受電コイルの間隔と電力伝送効率との関係を示すグラフである。It is a graph which shows the relationship between the space | interval of a power transmission coil and a receiving coil, and power transmission efficiency in the some non-contact electric power transmission apparatus from which the winding number of a coil differs. 従来の非接触電力伝送装置の回路図である。It is a circuit diagram of the conventional non-contact electric power transmission apparatus.

以下、本発明の非接触電力伝送装置の一実施形態を、を図１〜図７を参照して説明する。   Hereinafter, an embodiment of the non-contact power transmission apparatus of the present invention will be described with reference to FIGS.

本発明の非接触電力伝送装置１は、図１に示すように、一次側回路ユニット１０と、二次側回路ユニット２０と、を有している。   As shown in FIG. 1, the non-contact power transmission device 1 of the present invention includes a primary circuit unit 10 and a secondary circuit unit 20.

一次側回路ユニット１０は、周波数ｆ［Ｈｚ］の交流電圧Ｖ1［Ｖ］（即ち、交流電力）を出力する交流電源１１と、交流電源１１に直列に接続された送電コイル１２と、交流電源１１と送電コイル１２との間に直列に挿入された一次側共振キャパシタ１３と、を備えている。 The primary circuit unit 10 includes an AC power supply 11 that outputs an AC voltage V 1 [V] (that is, AC power) having a frequency f [Hz], a power transmission coil 12 that is connected in series to the AC power supply 11, and an AC power supply. 11 and a primary side resonance capacitor 13 inserted in series between the power transmission coil 12 and the power transmission coil 12.

送電コイル１２は、例えば、銅からなる細線が環状に密に巻回されてなる平面型一様らせんコイルである。送電コイル１２は、抵抗値Ｒ1となる内部抵抗１５を含んでいる。送電コイル１２は、交流電源１１から交流電圧Ｖ1が与えられると、電磁誘導作用により電力を後述する受電コイル２２に送信する。一次側共振キャパシタ１３は、例えば、プラスチックフィルム型やセラミック型のキャパシタ等が用いられる。なお、一次側共振キャパシタ１３は、交流電源１１に並列に接続されていてもよく、また、一次側共振キャパシタを設けない構成でもよい。 The power transmission coil 12 is, for example, a planar uniform spiral coil in which fine wires made of copper are densely wound in an annular shape. Transmitting coil 12 includes an internal resistance 15 of the resistance R 1. When the AC voltage V 1 is applied from the AC power supply 11, the power transmission coil 12 transmits power to the power receiving coil 22 described later by electromagnetic induction. For example, a plastic film type or ceramic type capacitor is used as the primary side resonance capacitor 13. In addition, the primary side resonance capacitor 13 may be connected in parallel to the AC power supply 11, or may be configured such that the primary side resonance capacitor is not provided.

送電コイル１２の自己インダクタンスＬ1、及び、一次側共振キャパシタ１３の静電容量ＣS1は、次の式（１）を満たすように設定されている。 The self-inductance L 1 of the power transmission coil 12 and the capacitance C S1 of the primary side resonance capacitor 13 are set so as to satisfy the following expression (1).

Figure 0005612956
Figure 0005612956

このように、送電コイル１２の自己インダクタンスＬ1、及び、一次側共振キャパシタ１３の静電容量ＣS1を設定することによって、一次側回路ユニット１０を共振状態にすることができる。 Thus, by setting the self-inductance L 1 of the power transmission coil 12 and the capacitance C S1 of the primary-side resonance capacitor 13, the primary-side circuit unit 10 can be brought into a resonance state.

二次側回路ユニット２０は、受電コイル２２と、受電コイル２２に直列に接続された負荷２４と、受電コイル２２に並列に接続された二次側共振キャパシタ２３と、を備えている。   The secondary circuit unit 20 includes a power receiving coil 22, a load 24 connected in series to the power receiving coil 22, and a secondary side resonance capacitor 23 connected in parallel to the power receiving coil 22.

受電コイル２２は、例えば、銅からなる細線が環状に密に巻回されてなる、上述した送電コイル１２と同一構成の平面型一様らせんコイルである。勿論、受電コイル２２は、送電コイル１２と異なる構成（材料、形状、巻き数など）であってもよく、特に、受電コイル２２の巻き数Ｎ2を、送電コイルの巻き数Ｎ1以下（即ち、巻き数比ｎ＝Ｎ1／Ｎ2≧１）とすることが望ましい。受電コイル２２は、抵抗値Ｒ2となる内部抵抗２５を含んでいる。受電コイル２２と送電コイル１２との間には相互インダクタンスＭが存在する。受電コイル２２は、送電コイル１２に対向して配置されることにより電磁誘導作用を受けて、送電コイル１２から送信された電力を受信する（即ち、誘導電圧及び誘導電流が誘起される）。なお、本実施形態において、送電コイル１２及び受電コイル２２は平面型一様らせんコイルを用いているが、これに限定されるものではなく、本発明の目的に反しない限り、送電コイル１２及び受電コイル２２の構成は任意である。 The power receiving coil 22 is, for example, a planar uniform spiral coil having the same configuration as that of the power transmitting coil 12 described above, in which fine wires made of copper are densely wound in a ring shape. Of course, the power receiving coil 22 may have a configuration (material, shape, number of turns, etc.) different from that of the power transmitting coil 12, and in particular, the number of turns N 2 of the power receiving coil 22 is less than or equal to the number of turns N 1 of the power transmitting coil (that is, It is desirable that the winding ratio n = N 1 / N 2 ≧ 1). Receiving coil 22 includes an internal resistor 25 of the resistance R 2. A mutual inductance M exists between the power receiving coil 22 and the power transmitting coil 12. The power receiving coil 22 is arranged opposite to the power transmission coil 12 to receive an electromagnetic induction effect and receive power transmitted from the power transmission coil 12 (that is, an induced voltage and an induced current are induced). In the present embodiment, the power transmission coil 12 and the power reception coil 22 are planar flat spiral coils. However, the present invention is not limited to this, and the power transmission coil 12 and the power reception coil are not limited to the object of the present invention. The configuration of the coil 22 is arbitrary.

二次側共振キャパシタ２３は、上述した一次側共振キャパシタ１３と同様に、例えば、プラスチックフィルム型やセラミック型のキャパシタ等が用いられる。負荷２４は、そのインピーダンスＺ0が、例えば、５０Ωに設定されている。 As the secondary side resonance capacitor 23, for example, a plastic film type or ceramic type capacitor is used similarly to the above-described primary side resonance capacitor 13. The load 24 has an impedance Z 0 set to 50Ω, for example.

ここで、図１において、受電コイル２２から二次側共振キャパシタ２３及び負荷２４側を見たインピーダンスをＺとすると、このインピーダンスＺは、次の式（２）で示される。   Here, in FIG. 1, when the impedance of the power receiving coil 22 viewed from the secondary resonance capacitor 23 and the load 24 side is Z, the impedance Z is expressed by the following equation (2).

Figure 0005612956
Figure 0005612956

式（２）に示すように、インピーダンスＺは、一般的に、実数項と虚数項との和で与えられ（Ｚ＝Ｒｅ［Ｚ］＋ｊＩｍ［Ｚ］）、インピーダンスＺに含まれる虚数項（Ｉｍ［Ｚ］）を０にして、インピーダンスＺを実数項（Ｒｅ［Ｚ］）のみにすることで、インピーダンス値を低下させて電力のロスを小さくできる。そして、この式（２）から、インピーダンスＺの虚数項Ｉｍ［Ｚ］は次の式（３）で示される。   As shown in the equation (2), the impedance Z is generally given by the sum of the real term and the imaginary term (Z = Re [Z] + jIm [Z]), and the imaginary term (Im) included in the impedance Z [Z]) is set to 0 and the impedance Z is set to only a real term (Re [Z]), thereby reducing the impedance value and reducing the power loss. From this equation (2), the imaginary term Im [Z] of the impedance Z is expressed by the following equation (3).

Figure 0005612956
Figure 0005612956

そして、この虚数項Ｉｍ［Ｚ］と受電コイル２２のリアクタンスωＬ2との和が０となる方程式を立てる。この方程式は次の式（４）で示される。 Then, an equation is established in which the sum of the imaginary term Im [Z] and the reactance ωL 2 of the receiving coil 22 becomes zero. This equation is expressed by the following equation (4).

Figure 0005612956
Figure 0005612956

そして、この式（４）を、二次側共振キャパシタ２３の静電容量ＣP2について解くと、次の式（５）になる。 Then, when this equation (4) is solved for the capacitance C P2 of the secondary side resonance capacitor 23, the following equation (5) is obtained.

Figure 0005612956
Figure 0005612956

但し、Ｚ0≧２ωＬ2、ω＝２πｆ、Ｚ0は負荷２４のインピーダンス［Ω］、ωは角速度［ｒａｄ／秒］、Ｌ2は受電コイル２２のインダクタンス［Ｈ］、ｆは交流電源１１の交流電圧Ｖ1の周波数［Ｈｚ］である。 However, Z 0 ≧ 2ωL 2 , ω = 2πf, Z 0 is the impedance [Ω] of the load 24, ω is the angular velocity [rad / sec], L 2 is the inductance [H] of the receiving coil 22, and f is the AC power source 11. The frequency of the AC voltage V 1 is [Hz].

そして、この式（５）を満たすように受電コイル２２の自己インダクタンスＬ2、二次側共振キャパシタ２３の静電容量ＣP2、及び、負荷２４のインピーダンスＺ0を設定することにより、二次側回路ユニット２０が共振状態となって、リアクタンスωＬ2と虚数項Ｉｍ［Ｚ］とが互いに打ち消される。 Then, by setting the self-inductance L 2 of the receiving coil 22, the capacitance C P2 of the secondary resonance capacitor 23, and the impedance Z 0 of the load 24 so as to satisfy this equation (5), the secondary side The circuit unit 20 enters a resonance state, and the reactance ωL 2 and the imaginary term Im [Z] cancel each other.

次に、二次側回路ユニット２０の各回路構成部材の値（パラメータ）の設定方法について説明する。   Next, a method for setting values (parameters) of each circuit component of the secondary circuit unit 20 will be described.

上述した非接触電力伝送装置１の二次側回路ユニット２０の負荷２４のインピーダンスＺ0を５０Ωとし、交流電源１１の交流電圧Ｖ1の周波数を１００ｋＨｚとする。このとき、上記式（５）の但し書きから、受電コイル２２の自己インダクタンスＬ2は次の式
Ｌ2≦Ｚ0／２ω
を満足する必要があり、この式に上記値を代入すると、受電コイル２２の自己インダクタンスＬ2は４０μＨ未満の値となる。この自己インダクタンスＬ2は、伝送距離を伸ばすためには大きい値の方がよい。そして、この算出した自己インダクタンスＬ2を、図２に示すコイルの巻き数と自己インダクタンスとの関係を示すグラフに当てはめると、受電コイル２２の巻き数は３回が適切であることが判る。そして、巻き数が３回の受電コイル２２の自己インダクタンスＬ2を図２のグラフから求めて、これらｆ、Ｚ0、Ｌ2と上記式（５）とを用いて二次側共振キャパシタ２３の静電容量ＣP2をさらに求めて、これら値を各回路構成部材に設定する。 The impedance Z 0 of the load 24 of the secondary circuit unit 20 of the non-contact power transmission apparatus 1 described above is 50Ω, and the frequency of the AC voltage V 1 of the AC power supply 11 is 100 kHz. At this time, from the proviso of the above formula (5), the self-inductance L 2 of the power receiving coil 22 is expressed by the following formula: L 2 ≦ Z 0 / 2ω
If the above value is substituted into this equation, the self-inductance L 2 of the power receiving coil 22 becomes a value less than 40 μH. The self-inductance L 2 is preferably a large value in order to increase the transmission distance. Then, when the calculated self-inductance L 2 is applied to a graph showing the relationship between the number of turns of the coil and the self-inductance shown in FIG. 2, it can be seen that the number of turns of the power receiving coil 22 is three. Then, the self-inductance L 2 of the receiving coil 22 having three turns is obtained from the graph of FIG. 2, and the f-Z 0 , L 2 and the above equation (5) are used to determine the secondary resonance capacitor 23. The capacitance C P2 is further obtained, and these values are set for each circuit component.

以上より、本発明によれば、二次側回路ユニット２０が、受電コイル２２に並列に存在する静電容量ＣP2を有し、そして、この静電容量ＣP2が、上記式（５）を満たすので、受電コイル２２に直列に接続された負荷２４を含めた二次側回路ユニット２０全体で共振状態にすることができ、そのため、受電コイル２２のリアクタンスωＬ2を打ち消すことができ、インピーダンスを整合させて電力伝送効率を高めることができる。 As described above, according to the present invention, the secondary side circuit unit 20 has the electrostatic capacity C P2 present in parallel with the power receiving coil 22, and the electrostatic capacity C P2 is expressed by the above equation (5). As a result, the entire secondary side circuit unit 20 including the load 24 connected in series to the power receiving coil 22 can be brought into a resonance state, so that the reactance ωL 2 of the power receiving coil 22 can be canceled and the impedance can be reduced. The power transmission efficiency can be increased by matching.

また、静電容量ＣP2が、受電コイル２２に並列に接続された二次側共振キャパシタ２３によるものであるので、上記式（５）を満たす静電容量ＣP2を容易に設定することができる。 Further, since the capacitance C P2 is due to the secondary resonance capacitor 23 connected in parallel to the power receiving coil 22, the capacitance C P2 satisfying the above equation (5) can be easily set. .

また、送電コイル１２の巻き数Ｎ1と受電コイル２２の巻き数Ｎ2との巻き数比ｎが１以上（即ち、ｎ＝Ｎ1／Ｎ2≧１）であるので、巻き数比を調整することによりインピーダンス整合を容易に行うことができるとともに、受電コイル２２の巻き数を小さくして二次側回路ユニット２０を軽量化することができる。 Further, since the winding ratio n between the winding number N 1 of the power transmission coil 12 and the winding number N 2 of the power receiving coil 22 is 1 or more (that is, n = N 1 / N 2 ≧ 1), the winding ratio is adjusted. As a result, impedance matching can be easily performed, and the number of turns of the power receiving coil 22 can be reduced to reduce the weight of the secondary circuit unit 20.

上述した本実施形態によれば、静電容量ＣP2が、受電コイル２２に並列に接続された二次側共振キャパシタ２３によるものであったが、本発明はこれに限定されるものではない。例えば、上記構成において二次側共振キャパシタ２３に代えて、上記静電容量ＣP2を受電コイル２２の寄生静電容量によるものとしてもよく、このようにすることで、部品を追加することなく、簡素な構成で電力伝送効率を高めることができる。 According to the present embodiment described above, the capacitance C P2 is due to the secondary resonance capacitor 23 connected in parallel to the power receiving coil 22, but the present invention is not limited to this. For example, instead of the secondary side resonance capacitor 23 in the above configuration, the capacitance C P2 may be due to the parasitic capacitance of the power receiving coil 22, and in this way, without adding components, The power transmission efficiency can be increased with a simple configuration.

また、本実施形態によれば、一次側回路ユニット１０の送電コイル１２と二次側回路ユニット２０の受電コイル２２とが直接対向して配置されることにより電力を伝送するものであったが、本発明はこれに限定されるものではない。例えば、図３に示す構成の非接触電力伝送装置２であってもよい。   Further, according to the present embodiment, the power transmission coil 12 of the primary side circuit unit 10 and the power reception coil 22 of the secondary side circuit unit 20 are arranged to face each other directly, thereby transmitting power. The present invention is not limited to this. For example, the non-contact power transmission device 2 having the configuration shown in FIG. 3 may be used.

非接触電力伝送装置２は、第１回路ユニット４０と中継回路ユニット６０とを有する第１回路装置３１と、第２回路ユニット５０を有する第２回路装置３２と、を備えている。   The non-contact power transmission device 2 includes a first circuit device 31 having a first circuit unit 40 and a relay circuit unit 60, and a second circuit device 32 having a second circuit unit 50.

第１回路ユニット４０は、内部抵抗４５を含む平面型一様らせんコイルである第１コイル４２と、第１コイル４２に直列に接続された第１負荷４４と、第１コイル４２に並列に接続された第１共振キャパシタ４３と、第１コイル４２に交流電圧を印加する図示しない交流電源と、を備えている。第１回路ユニット４０において、第１コイル４２の自己インダクタンスＬ1、第１共振キャパシタ４３の静電容量ＣP1、第１負荷４４のインピーダンスＺ1が、上記式（５）を満たす値に設定されている（但し、式（５）において、Ｌ2をＬ1、ＣP2をＣP1、Ｚ0をＺ1に読み替えて適用）。つまり、第１回路ユニット４０は、交流電源の周波数ｆにおいて共振状態となる。 The first circuit unit 40 includes a first coil 42, which is a planar uniform helical coil including an internal resistor 45, a first load 44 connected in series to the first coil 42, and a parallel connection to the first coil 42. The first resonance capacitor 43 and an AC power supply (not shown) for applying an AC voltage to the first coil 42 are provided. In the first circuit unit 40, the self-inductance L 1 of the first coil 42, the capacitance C P1 of the first resonance capacitor 43, and the impedance Z 1 of the first load 44 are set to values that satisfy the above formula (5). (However, in the formula (5), L 2 is read as L 1 , C P2 is read as C P1 , and Z 0 is read as Z 1 ). That is, the first circuit unit 40 is in a resonance state at the frequency f of the AC power supply.

中継回路ユニット６０は、内部抵抗６５を含む平面型一様らせんコイルである中継コイル６２と、中継コイル６２に直列に接続された共振キャパシタ６３と、を備えている。中継回路ユニット６０において、中継コイル６２の自己インダクタンスＬ3、共振キャパシタ６３の静電容量Ｃ3が、上記式（１）を満たす値に設定されている（但し、式（１）において、Ｌ1をＬ3、ＣS1をＣ3に読み替えて適用）。つまり、中継回路ユニット６０は、交流電源の周波数ｆにおいて共振状態となる。共振キャパシタ６３に代えて、中継コイル６２の寄生静電容量が上記静電容量Ｃ3となるようにしてもよい。 The relay circuit unit 60 includes a relay coil 62 that is a planar uniform helical coil including an internal resistor 65, and a resonance capacitor 63 connected in series to the relay coil 62. In the relay circuit unit 60, the self-inductance L 3 of the relay coil 62 and the capacitance C 3 of the resonant capacitor 63 are set to values that satisfy the above formula (1) (however, in the formula (1), L 1 Is replaced with L 3 and C S1 is replaced with C 3 ). That is, the relay circuit unit 60 enters a resonance state at the frequency f of the AC power supply. Instead of the resonant capacitor 63, the parasitic capacitance of the relay coil 62 may be set to be the capacitance C 3.

第２回路ユニット５０は、第１回路ユニット４０と同様に、内部抵抗５５を含む平面型一様らせんコイルである第２コイル５２と、第２コイル５２に直列に接続された第２負荷５４と、第２コイル５２に並列に接続された第２共振キャパシタ５３と、第２コイル５２に交流電圧を印加する図示しない交流電源と、を備えている。第２回路ユニット５０において、第２コイル５２の自己インダクタンスＬ2、第２共振キャパシタ５３の静電容量ＣP2、第２負荷５４のインピーダンスＺ0が、上記式（５）を満たす値に設定されている。つまり、第２回路ユニット５０は、交流電源の周波数ｆにおいて共振状態となる。 Similar to the first circuit unit 40, the second circuit unit 50 includes a second coil 52 that is a planar uniform spiral coil including an internal resistance 55, and a second load 54 connected in series to the second coil 52. The second resonance capacitor 53 connected in parallel to the second coil 52 and an AC power source (not shown) for applying an AC voltage to the second coil 52 are provided. In the second circuit unit 50, the self-inductance L 2 of the second coil 52, the capacitance C P2 of the second resonance capacitor 53, and the impedance Z 0 of the second load 54 are set to values that satisfy the above equation (5). ing. That is, the second circuit unit 50 is in a resonance state at the frequency f of the AC power supply.

第１コイル４２と第２コイル５２と中継コイル６２とはそれぞれ同軸に重ねられて、且つ、第１コイル４２と第２コイル５２との間に中継コイル６２を挟むようにして配置されている。第１回路装置３１から第２回路装置３２に電力伝送を行うとき、第１コイル４２が送電コイルとして、第２コイル５２が受電コイルとして機能する。また、第２回路装置３２から第１回路装置３１に電力伝送を行うとき、第１コイル４２が受電コイルとして、第２コイル５２が送電コイルとして機能する。   The first coil 42, the second coil 52, and the relay coil 62 are arranged so as to be coaxially overlapped with each other and the relay coil 62 is sandwiched between the first coil 42 and the second coil 52. When power is transmitted from the first circuit device 31 to the second circuit device 32, the first coil 42 functions as a power transmission coil and the second coil 52 functions as a power reception coil. Further, when power is transmitted from the second circuit device 32 to the first circuit device 31, the first coil 42 functions as a power receiving coil, and the second coil 52 functions as a power transmitting coil.

このように、第１コイル４２と第２コイル５２との間に挟むように配置される中継コイル６２とこの中継コイル６２に直列に接続された共振キャパシタ６３とを備えた、交流電源の周波数ｆにおいて共振状態となる、中継回路ユニット６０を設けることにより、中継回路ユニット６０が備える中継コイル６２によって第１コイル４２と第２コイル５２との間で伝送される電力を中継して、第１コイル４２と第２コイル５２との伝送距離を伸ばすことができる。また、中継コイル６２の巻き数を増やすことで、各コイル間の相互インダクタンスＭ13、Ｍ23が増加し、伝送距離をさらに伸ばすことができる。また、第１回路ユニット４０及び第２回路ユニット５０共に交流電源を備えており、双方向の電力伝送ができる。また、第１負荷４４のインピーダンスＺ１及び第２負荷５４のインピーダンスＺ0がそれぞれ５０Ωになるように調整することにより、一般的な５０Ω線路を使用することができ、インピーダンスの整合が容易にできる。 As described above, the frequency f of the AC power source including the relay coil 62 disposed so as to be sandwiched between the first coil 42 and the second coil 52 and the resonant capacitor 63 connected in series to the relay coil 62. By providing the relay circuit unit 60 that is in a resonance state, the power transmitted between the first coil 42 and the second coil 52 is relayed by the relay coil 62 included in the relay circuit unit 60, and the first coil The transmission distance between 42 and the second coil 52 can be extended. Further, by increasing the number of windings of the relay coil 62, the mutual inductance M 13, M 23 between the coils is increased, thereby further extend the transmission distance. Further, both the first circuit unit 40 and the second circuit unit 50 are provided with an AC power source, and bidirectional power transmission can be performed. In addition, by impedance Z 0 of the impedance Z1 and the second load 54 of the first load 44 is adjusted to 50Ω respectively, typical 50Ω line can be used, impedance matching can be easily.

（検証１）
本発明者は、上述した非接触電力伝送装置１の一次側回路ユニット１０及び二次側回路ユニット２０に設けられる各共振キャパシタの接続形態と電力伝送効率との関係について検証を行った。 (Verification 1)
The inventor verified the relationship between the connection form of each resonance capacitor provided in the primary side circuit unit 10 and the secondary side circuit unit 20 of the contactless power transmission device 1 and the power transmission efficiency.

（実施例１）
図１の非接触電力伝送装置１において、一次側回路ユニット１０について、送電コイル１２として、直径０．５ｍｍの銅線からなる、巻き数１０回、平均一辺長さ（即ち、外縁の一辺長さＤｏｕｔと内縁の一辺長さＤｉｎとの平均一辺長さＤａｖｇ；Ｄａｖｇ＝（Ｄｏｕｔ＋Ｄｉｎ）／２）が５ｃｍの正方形環状密巻の平板型一様らせんコイルを用い、そして、交流電源１１の出力する交流電圧Ｖ１の周波数ｆを１００ｋＨｚとし、送電コイル１２の自己インダクタンスＬ1と一次側共振キャパシタ１３の静電容量ＣP1とが上記式（１）を満たすようにそれぞれの値を設定した。また、二次側回路ユニット２０について、受電コイル２２として、送電コイル１２と同一構成の平板型一様らせんコイルを用い、そして、受電コイル２２の自己インダクタンスＬ2と二次側共振キャパシタ２３の静電容量ＣP2と負荷２４のインピーダンスＺ0とが、上記式（５）を満足するようにそれぞれの値を設定した。なお、図１の回路構成では、共振キャパシタを一次側に直列、二次側に並列に設けており、以下、「ＳＰ共振回路」という。 Example 1
In the non-contact power transmission apparatus 1 of FIG. 1, the primary circuit unit 10 is composed of a copper wire having a diameter of 0.5 mm, the number of windings is 10 times, and the average side length (that is, the length of one side of the outer edge) An average side length Davg of Dout and the side length Din of the inner edge Dav; Davg = (Dout + Din) / 2) is a square annular closely wound flat plate-shaped uniform spiral coil of 5 cm, and an AC output from the AC power supply 11 is used. The frequency f of the voltage V1 was set to 100 kHz, and the respective values were set so that the self-inductance L 1 of the power transmission coil 12 and the capacitance C P1 of the primary side resonance capacitor 13 satisfied the above formula (1). In the secondary side circuit unit 20, a flat plate-shaped uniform coil having the same configuration as that of the power transmission coil 12 is used as the power reception coil 22, and the self-inductance L 2 of the power reception coil 22 and the static resonance of the secondary side resonance capacitor 23 are used. The values were set so that the capacitance C P2 and the impedance Z 0 of the load 24 satisfied the above formula (5). In the circuit configuration of FIG. 1, the resonant capacitor is provided in series on the primary side and in parallel on the secondary side, and is hereinafter referred to as “SP resonant circuit”.

（実施例２）
実施例１において、送電コイル１２及び受電コイル２２の平均一辺長さを１０ｃｍに変更した以外は、実施例１と同一構成とした。 (Example 2)
In Example 1, it was set as the same structure as Example 1 except having changed the average one side length of the power transmission coil 12 and the receiving coil 22 into 10 cm.

（比較例１）
図４に示す非接触電力伝送装置４は、図１の非接触電力伝送装置１の二次側回路ユニット２０が備える二次側共振キャパシタ２３に代えて、受電コイル２２と負荷２４との間に直列に挿入された二次側共振キャパシタ２７を備えている。これ以外は図１と同様の回路構成であり、同一部材には同一符号を付して示す。なお、図４の回路構成では、共振キャパシタを一次側に直列、二次側に直列に設けており、以下、「ＳＳ共振回路」という。そして、このＳＳ共振回路において、一次側回路ユニット１０について、実施例１と同一構成とし、二次側回路ユニット２０について、受電コイル２２及び負荷２４は実施例１と同一構成とし、受電コイル２２の自己インダクタンスＬ2と二次側共振キャパシタ２７の静電容量ＣS2とが、次の式（６）を満たすように、それぞれの値を設定した。 (Comparative Example 1)
A contactless power transmission device 4 shown in FIG. 4 is arranged between a power receiving coil 22 and a load 24 instead of the secondary resonance capacitor 23 provided in the secondary circuit unit 20 of the contactless power transmission device 1 of FIG. A secondary resonance capacitor 27 is provided in series. Other than this, the circuit configuration is the same as in FIG. 1, and the same members are denoted by the same reference numerals. In the circuit configuration of FIG. 4, the resonant capacitors are provided in series on the primary side and in series on the secondary side, and are hereinafter referred to as “SS resonant circuit”. In this SS resonance circuit, the primary side circuit unit 10 has the same configuration as that of the first embodiment, and the secondary side circuit unit 20 has the same configuration of the power receiving coil 22 and the load 24 as those of the first embodiment. The respective values were set so that the self-inductance L 2 and the capacitance C S2 of the secondary resonance capacitor 27 satisfy the following expression (6).

Figure 0005612956
Figure 0005612956

（比較例２）
比較例１において、送電コイル１２及び受電コイル２２の平均一辺長さを１０ｃｍに変更した以外は、比較例１と同一構成とした。 (Comparative Example 2)
In the comparative example 1, it was set as the same structure as the comparative example 1 except having changed the average one side length of the power transmission coil 12 and the receiving coil 22 into 10 cm.

（比較例３）
図５に示す非接触電力伝送装置５は、図１の非接触電力伝送装置１の一次側回路ユニット１０が備える一次側共振キャパシタ１３に代えて、交流電源１１と並列に接続された一次側共振キャパシタ１７を備え、且つ、図１の非接触電力伝送装置１の二次側回路ユニット２０が備える二次側共振キャパシタ２３に代えて、受電コイル２２と負荷２４との間に直列に挿入された二次側共振キャパシタ２７を備えている。これ以外は図１と同様の回路構成であり、同一部材には同一符号を付して示す。なお、図５の回路構成では、共振キャパシタを一次側に並列、二次側に直列に設けており、以下、「ＰＳ共振回路」という。このＰＳ共振回路において、一次側回路ユニット１０について、交流電源１１及び送電コイル１２は実施例１と同一構成とし、送電コイル１２の自己インダクタンスＬ2と一次側共振キャパシタ１７の静電容量ＣP1とが、次の式（７）を満たすようにそれぞれの値を設定し、また、二次側回路ユニット２０について、受電コイル２２及び負荷２４は実施例１と同一構成とし、受電コイル２２の自己インダクタンスＬ2と二次側共振キャパシタ２７の静電容量ＣS2とが、上記式（６）を満たすようにそれぞれの値を設定した。 (Comparative Example 3)
A contactless power transmission device 5 shown in FIG. 5 is replaced with a primary side resonance capacitor 13 provided in the primary side circuit unit 10 of the contactless power transmission device 1 of FIG. In place of the secondary side resonance capacitor 23 provided with the capacitor 17 and included in the secondary side circuit unit 20 of the non-contact power transmission device 1 of FIG. 1, it is inserted in series between the power receiving coil 22 and the load 24. A secondary resonance capacitor 27 is provided. Other than this, the circuit configuration is the same as in FIG. 1, and the same members are denoted by the same reference numerals. In the circuit configuration of FIG. 5, the resonant capacitor is provided in parallel on the primary side and in series on the secondary side, and is hereinafter referred to as “PS resonant circuit”. In this PS resonance circuit, the AC power supply 11 and the power transmission coil 12 of the primary side circuit unit 10 have the same configuration as in the first embodiment, and the self-inductance L 2 of the power transmission coil 12 and the capacitance C P1 of the primary side resonance capacitor 17 However, the respective values are set so as to satisfy the following formula (7), and the power receiving coil 22 and the load 24 of the secondary side circuit unit 20 have the same configuration as that of the first embodiment, and the self inductance of the power receiving coil 22 is set. The respective values were set so that L 2 and the capacitance C S2 of the secondary resonance capacitor 27 satisfy the above formula (6).

Figure 0005612956
Figure 0005612956

（比較例４）
比較例３において、送電コイル１２及び受電コイル２２の平均一辺長さを１０ｃｍに変更した以外は、比較例３と同一構成とした。 (Comparative Example 4)
In the comparative example 3, it was set as the same structure as the comparative example 3 except having changed the average one side length of the power transmission coil 12 and the receiving coil 22 into 10 cm.

上述した実施例１、２、比較例１〜４について、一次側回路ユニット１０及び二次側回路ユニット２０のそれぞれに電力計を接続して、送電コイル１２と受電コイル２２とを同心で密に重ねた状態（つまり、間隔０）から徐々に間隔（即ち、伝送距離）を広げていったときの各回路ユニットにおける電力を測定し、これら測定した電力の比率から電力伝送効率を算出した。この結果を図６に示す。   About Example 1, 2 mentioned above, and Comparative Examples 1-4, a wattmeter is connected to each of the primary side circuit unit 10 and the secondary side circuit unit 20, and the power transmission coil 12 and the receiving coil 22 are concentrically and densely. The power in each circuit unit when the interval (ie, transmission distance) was gradually increased from the overlapped state (ie, interval 0) was measured, and the power transmission efficiency was calculated from the ratio of the measured power. The result is shown in FIG.

図６に示すグラフから、二次側回路ユニット２０において受電コイル２２に並列に二次側共振キャパシタ２３を接続したＳＰ共振回路の方が、受電コイル２２に直列に二次側共振キャパシタを接続したＳＳ共振回路及びＰＳ共振回路より電力伝送効率が高いことが判明した（実施例１、２、比較例１〜４）。また、比較例１と比較例３、及び、比較例２と比較例４、のグラフがそれぞれ重なっていることから、一次側回路ユニット１０については、一次側共振キャパシタを直列又は並列のいずれの接続で設けても、電力伝送効率に変化はなかった（比較例１〜４）。また、各コイルの一辺長さが大きい方が、各コイルの間隔が広がった場合でも、電力伝送効率を高く維持できることが判明した（実施例１、２）。これら結果から、本発明の効果を確認することができた。   From the graph shown in FIG. 6, the SP resonance circuit in which the secondary side resonance capacitor 23 is connected in parallel to the power receiving coil 22 in the secondary side circuit unit 20 has the secondary side resonance capacitor connected in series to the power receiving coil 22. It was found that the power transmission efficiency was higher than that of the SS resonance circuit and the PS resonance circuit (Examples 1 and 2 and Comparative Examples 1 to 4). In addition, since the graphs of Comparative Example 1 and Comparative Example 3 and Comparative Example 2 and Comparative Example 4 are respectively overlapped, for the primary side circuit unit 10, the primary side resonance capacitor is connected either in series or in parallel. Even if it provided, power transmission efficiency did not change (Comparative Examples 1 to 4). It was also found that the power transmission efficiency can be maintained high when the one side length of each coil is large even when the interval between the coils is widened (Examples 1 and 2). From these results, the effect of the present invention could be confirmed.

（検証２）
また、本発明者は、送電コイル１２と受電コイル２２との巻き数と電力伝送効率との関係について検証を行った。 (Verification 2)
In addition, the inventor has verified the relationship between the number of turns of the power transmission coil 12 and the power reception coil 22 and the power transmission efficiency.

上述した非接触電力伝送装置１において送電コイル１２と受電コイル２２とのそれぞれの巻き数が異なる構成において、各コイル間の間隔（即ち、伝送距離）を変化させて電力伝送効率を測定した結果を図７に示す。   In the contactless power transmission device 1 described above, in a configuration in which the number of turns of the power transmission coil 12 and the power reception coil 22 is different, the result of measuring the power transmission efficiency by changing the interval between the coils (that is, the transmission distance) is shown. As shown in FIG.

図７のグラフのＰ１は、送電コイル１２の巻き数Ｎ1を１０回、受電コイル２２の巻き数Ｎ2を３回、負荷２４のインピーダンスを５０Ωとしたときを示し、Ｐ２は、送電コイル１２の巻き数Ｎ1を３回、受電コイル２２の巻き数Ｎ2を３回、負荷２４のインピーダンスを５０Ωとしたときを示し、Ｐ３は、送電コイル１２の巻き数Ｎ1を１５回、受電コイル２２の巻き数Ｎ2を３回、負荷２４のインピーダンスを５０Ωとしたときを示し、Ｐ４は、送電コイル１２の巻き数Ｎ1を１０回、受電コイル２２の巻き数Ｎ2を１０回、負荷２４のインピーダンスを３５０Ωとしたときを示す。各構成において、送電コイル１２及び受電コイル２２の平均一辺長さは５０ｃｍとした。 P1 in the graph of FIG. 7, the number of turns N 1 to 10 times of the transmitting coil 12, the number of turns N 2 three times of the power receiving coil 22, indicates when the impedance of the load 24 was 50 [Omega, P2 is the power transmission coil 12 The number of turns N 1 of the power receiving coil 22 is 3 times, the number of turns N 2 of the power receiving coil 22 is 3 times, and the impedance of the load 24 is 50Ω. P3 is the number of turns N 1 of the power transmitting coil 12 15 times. 22 shows the case where the number of turns N 2 is 3 times and the impedance of the load 24 is 50Ω. P4 is the number of turns N 1 of the power transmission coil 12 is 10 times and the number of turns N 2 of the power receiving coil 22 is 10 times. The case where the impedance of 24 is set to 350Ω is shown. In each configuration, the average side length of the power transmission coil 12 and the power reception coil 22 was 50 cm.

図７のグラフより、受電コイル２２の巻き数Ｎ2が同じであれば、送電コイル１２の巻き数Ｎ１が多いほど電力伝送効率を高めることができることが判明した（Ｐ１〜Ｐ３）。また、負荷２４のインピーダンスＺ0が高い場合でも、送電コイル１２及び受電コイル２２のそれぞれの巻き数を多くすることで電力伝送効率を高めることができることが判明した（Ｐ２、Ｐ４）。 From the graph of FIG. 7, if the number of turns N 2 are the same on the receiving coil 22, it has been found that can be the more number of turns N1 of the power transmission coil 12 increases the power transmission efficiency (P1 to P3). Further, it has been found that even when the impedance Z 0 of the load 24 is high, the power transmission efficiency can be increased by increasing the number of turns of each of the power transmission coil 12 and the power reception coil 22 (P2, P4).

なお、前述した実施形態は本発明の代表的な形態を示したに過ぎず、本発明は、実施形態に限定されるものではない。即ち、本発明の骨子を逸脱しない範囲で種々変形して実施することができる。   In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

１、２ 非接触電力伝送装置
１０ 一次側回路ユニット
１１ 交流電源
１２ 送電コイル
１３ 一次側共振キャパシタ
２０ 二次側回路ユニット
２２ 受電コイル
２３ 二次側共振キャパシタ（キャパシタ）
２４ 負荷 DESCRIPTION OF SYMBOLS 1, 2 Non-contact electric power transmission apparatus 10 Primary side circuit unit 11 AC power supply 12 Power transmission coil 13 Primary side resonance capacitor 20 Secondary side circuit unit 22 Power receiving coil 23 Secondary side resonance capacitor (capacitor)
24 Load

Claims (2)

交流電源による電力を電磁誘導作用によって送信する送電コイルを有する一次側回路ユニットと、前記送電コイルから送信された前記電力を受信する受電コイルと該受電コイルに直列接続された負荷とを有する二次側回路ユニットと、を有する非接触電力伝送装置において、
前記二次側回路ユニットが、前記受電コイルに並列に存在する静電容量ＣP2を有し、
前記静電容量Ｃ P2 が、前記受電コイルの寄生静電容量によるものであり、そして、
前記静電容量ＣP2が、以下の式を満たすことを特徴とする非接触電力伝送装置。
ＣP2＝（Ｚ0±√（Ｚ0 2−４ω2Ｌ2 2））／２ω2Ｚ0Ｌ2
但し、Ｚ0≧２ωＬ2、ω＝２πｆ、Ｚ0は前記負荷のインピーダンス［Ω］、ωは角速度［ｒａｄ／秒］、Ｌ2は前記受電コイルの自己インダクタンス［Ｈ］、ｆは前記交流電源の周波数［Ｈｚ］である。 A secondary circuit unit having a primary circuit unit having a power transmission coil for transmitting power from an AC power supply by electromagnetic induction, a power reception coil for receiving the power transmitted from the power transmission coil, and a load connected in series to the power reception coil In a non-contact power transmission device having a side circuit unit,
The secondary side circuit unit has a capacitance C P2 that exists in parallel with the power receiving coil,
The capacitance C P2 is due to the parasitic capacitance of the receiving coil; and
The non-contact power transmission device, wherein the capacitance C P2 satisfies the following formula.
C P2 = (Z 0 ± √ (Z 0 2 -4ω 2 L 2 2 )) / 2ω 2 Z 0 L 2
However, Z 0 ≧ 2ωL 2 , ω = 2πf, Z 0 is the impedance [Ω] of the load, ω is the angular velocity [rad / sec], L 2 is the self-inductance [H] of the power receiving coil, and f is the AC power source. [Hz]. 前記送電コイルの巻き数と前記受電コイルの巻き数との巻き数比ｎが、以下の式を満たすことを特徴とする請求項１に記載の非接触電力伝送装置。
ｎ＝Ｎ1／Ｎ2≧１
但し、Ｎ1が前記送電コイルの巻き数［回］、Ｎ2が前記受電コイルの巻き数［回］である。 The contactless power transmission device according to claim 1, wherein a winding ratio n between the number of turns of the power transmission coil and the number of turns of the power receiving coil satisfies the following expression.
n = N 1 / N 2 ≧ 1
N 1 is the number of turns of the power transmission coil [times], and N 2 is the number of turns of the power receiving coil [ times].
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