WO2014103438A1 - 電力伝送システム - Google Patents
電力伝送システム Download PDFInfo
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- WO2014103438A1 WO2014103438A1 PCT/JP2013/074100 JP2013074100W WO2014103438A1 WO 2014103438 A1 WO2014103438 A1 WO 2014103438A1 JP 2013074100 W JP2013074100 W JP 2013074100W WO 2014103438 A1 WO2014103438 A1 WO 2014103438A1
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- 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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- the present invention relates to a power transmission system that transmits electric power from a power transmission device to a power reception device by an electric field coupling method.
- Patent Document 1 discloses an electric field coupling type (non-contact type) power transmission system (power supply system) having a power transmission device (fixed body) and a power reception device (movable body).
- This power transmission system includes a series resonance circuit and a parallel resonance circuit that are configured by a power transmission device and a power reception device. It is disclosed that power can be supplied with high efficiency by matching the series resonance frequency of the series resonance circuit with the parallel resonance frequency of the parallel resonance circuit.
- Patent Document 1 When the installation position of the power receiving apparatus on the power transmitting apparatus is not a fixed position but within a certain range, the configuration as described in Patent Document 1 may not ensure sufficient power transmission efficiency.
- the present invention aims to ensure sufficient power transmission efficiency even when the installation position of the power receiving apparatus on the power transmitting apparatus is not a fixed position but within a certain range.
- the power transmission system includes: A power transmission system for transmitting power from a power transmission device to a power reception device by an electric field coupling method,
- the power transmission device At least a pair of power transmission electrodes;
- the capacitor formed between the power transmission electrodes and the power transmission side inductor constitute a series resonance circuit,
- the power receiving device At least a pair of power receiving electrodes;
- the capacitor and inductor formed between the receiving electrodes constitute a parallel resonant circuit, A composite resonance including a series resonant circuit and a parallel resonant circuit via a combined capacitance between each power transmission electrode and each power reception electrode when each power transmission electrode of the power transmission device and each power reception electrode of the power reception device are in an opposing state.
- the resonance frequency at which the impedance of the composite resonant circuit viewed from the signal source side is minimized with the input terminal of the load circuit short-circuited is the predetermined facing where the combined capacity is maximum.
- the impedance of the component of the composite resonance circuit is set so that the impedance of the composite resonance circuit viewed from the signal source side with the input terminal of the load circuit opened is higher than the resonance frequency at which the impedance becomes maximum.
- the power transmission device of the electric field coupling type power transmission system includes at least a pair of power transmission electrodes, and the power reception device includes at least a pair of power reception electrodes.
- a coupling capacitance is generated when each power transmitting electrode and each power receiving electrode face each other. This coupling capacitance changes according to the positional relationship when each power transmitting electrode and each power receiving electrode face each other.
- the power transmission system includes a series resonance circuit and a parallel resonance circuit and constitutes a composite resonance circuit in which both circuits are coupled via a coupling capacitor, the series resonance frequency and the parallel resonance are caused by a change in the coupling capacitance. The frequency changes. That is, the series resonance frequency and the parallel resonance frequency do not match. Therefore, when the installable position of the power receiving apparatus on the power transmitting apparatus is not a fixed position but in a range having a certain size, it is substantially difficult to match the series resonance frequency and the parallel resonance frequency.
- the present invention can ensure sufficient power transmission efficiency in a power transmission system in which the position where the power receiving device can be installed on the power transmitting device is defined as a range having a fixed area instead of a fixed position.
- the purpose is to.
- the inventor of the present application has made various studies, and by setting the impedance of the component of the composite resonance circuit to a predetermined impedance, it is possible to increase the power transmission efficiency in the power transmission system and reduce the frequency change thereof. I found out. The details will be described below.
- FIG. 1 is a diagram illustrating a circuit configuration of a power transmission system according to an embodiment.
- the power transmission system according to the embodiment is an electric field coupling type power transmission system.
- the power transmission system of the present embodiment includes a power transmission device 10 and a power reception device 20.
- the power transmission device 10 includes a signal source SG, a step-up transformer T1, an inductor L1, and a pair of power transmission electrodes Et1 and Et2.
- the signal source SG generates an AC voltage having a predetermined voltage value and a predetermined frequency.
- the step-up transformer T1 boosts the AC voltage generated by the signal source SG, and applies the boosted AC voltage between the pair of power transmission electrodes Et1 and Et2 via the inductor L1.
- the inductor L1 may be configured by a leakage inductance of the step-up transformer T1.
- the pair of power transmission electrodes Et1 and Et2 constitute a capacitor C1.
- the power receiving device 20 includes a pair of power receiving electrodes Er1, Er2, an inductor L2, a step-down transformer T2, a rectifier circuit REC, and a load circuit LD.
- the pair of power receiving electrodes Er1 and Er2 constitute a capacitor C2.
- the step-down transformer T2 steps down the AC voltage induced between the pair of power receiving electrodes Er1 and Er2 via the power receiving side inductor L2, and applies the stepped down AC voltage between the pair of input terminals of the rectifier circuit REC. .
- the inductor L2 may be configured by an excitation inductance of the primary winding of the step-down transformer T2.
- the rectifier circuit REC includes a plurality of diodes D and a capacitor C3, converts the input AC voltage into a DC voltage, and applies it between a pair of input terminals of the load circuit LD.
- the load circuit LD performs a predetermined function of the load circuit LD using the DC voltage applied from the rectifier circuit REC.
- FIG. 2 is a diagram illustrating a case where the step-up transformer T1, the step-down transformer T2, and the rectifier circuit REC are not provided.
- the pair of power transmission electrodes Et1 and Et2 of the power transmission device 10 when the power transmission device 10 is provided with the step-up transformer T1 and the power reception device 20 is provided with the step-down transformer T2, the pair of power transmission electrodes Et1 and Et2 of the power transmission device 10 and When power transmission is performed with the pair of power receiving electrodes Er1 and Er2 of the power receiving device 20 in a predetermined facing state, the pair of power receiving electrodes Et1 and Et2 of the power transmitting device 10 and the pair of power receiving electrodes Er1 and Er2 of the power receiving device 20 The electric field strength between can be increased. Further, the transmission power between the power transmission device 10 and the power reception device 20 can be increased.
- the capacitor C1 and the inductor L1 of the power transmission device 10 constitute a series resonant circuit.
- the capacitor C2 and the inductor L2 of the power receiving device 20 constitute a parallel resonance circuit.
- each power transmission electrode Et1, Et2 of the power transmission apparatus 10 and each power reception electrode Er1, Er2 of the power reception apparatus 20 are in an opposing state, each power transmission electrode Et1, Et2 and each power reception electrode Er1.
- a composite resonance circuit including a series resonance circuit of the power transmission device 10 and a parallel resonance circuit of the power reception device 20 is configured via a coupling capacitance Cm (combined capacitance) between the power reception device 20 and Er2.
- Cm combined capacitance
- the inductance (impedance) of the inductance L1 as a component of the composite resonance circuit is set so that the impedance of the composite resonance circuit viewed from the side becomes higher than the resonance frequency at which the maximum is achieved.
- the impedance of the component of the composite resonance circuit is a signal source in a state where the input terminals of the load circuit LD are short-circuited in a predetermined facing state where the coupling capacitance Cm (combined capacitance) is maximum.
- the resonance frequency of the composite resonance circuit is set to be lower than the resonance frequency higher than the maximum resonance frequency among the resonance frequencies at which the impedance is minimum.
- the impedances of the components of the composite resonance circuit are such that the power transmission electrodes Et1 and Et2 of the power transmission device 10 and the power reception electrodes Er1 and Er2 of the power reception device 20 face each other within a predetermined position range. In this case, it is set so that the height relationship between the maximum resonance frequency and the minimum resonance frequency is satisfied.
- 3A (a1) to (c1) and FIGS. 3B (d1) to (e1) show the input impedance of the power transmission device 10 in FIG. 2 as viewed from the signal source SG to the power reception device 20 with respect to the frequency of the input AC voltage.
- the characteristics of 3A (a2) to (c2) and FIGS. 3B (d2) to (e2) show the characteristics of power transmission efficiency and outputable power with respect to the frequency of the input AC voltage. In the following description, they are simply referred to as (a1) to (e1) and (a2) to (e2).
- (A1) to (e1) and (a2) to (e2) show cases where the value of the inductor L1 of the power transmission device 10 is sequentially reduced.
- the input impedance viewed from the signal source SG of the power transmission device 10 to the power reception device 20 side is an input impedance of a composite resonance circuit composed of the power transmission device 10 and the power reception device 20.
- (A1) to (e1) are when the input terminals tm1 and tm2 of the load circuit LD of the power receiving device 20 are opened, that is, when the load circuit LD is opened (hereinafter referred to as “when the load circuit LD is opened” as appropriate).
- the characteristics of the input impedance and the characteristics of the input impedance when the input terminals tm1 and tm2 of the load circuit LD of the power receiving device 20 are short-circuited hereinafter referred to as “when the load circuit LD is short-circuited” as appropriate) are shown.
- the load circuit LD When the load circuit LD is opened, only the series resonance in the composite resonance circuit by the power transmission device 10 and the power reception device 20 appears, and the parallel resonance on the power reception device 20 side does not appear. In this case, the number of resonance points is smaller than when the load circuit LD is short-circuited, and in the examples (a1) to (e1), only the input impedance minimum point indicated by the marker (m12) appears.
- the inductance of the inductor L1 of the power transmission device 10 When the inductance of the inductor L1 of the power transmission device 10 is decreased, the frequency of the input impedance minimum point when the load circuit LD is short-circuited increases. Further, as shown in (a2) to (e2), the peak value of the power transmission efficiency is increased, and the frequency deviation of the power transmission efficiency is reduced. In addition, the output possible power increases to a certain value and then decreases.
- power transmission efficiency can be increased by performing power transmission in the vicinity of the frequency at which the input impedance becomes maximum when the load circuit LD is opened. By making the frequency at which the input impedance becomes maximum when the load circuit LD is opened close to the frequency at which the input impedance becomes minimum when the load circuit LD is short-circuited, the output power can be increased.
- the power transmission efficiency is good and the output power can be increased at (d2).
- the resonance frequency shifts when the positions of the power transmission electrodes Et1 and Et2 of the power transmission device 10 and the power reception electrodes Er1 and Er2 of the power reception device 20 are shifted. Considering this, it is desirable that the deviation of the power transmission efficiency and the deviation of the output power are small. Therefore, (d2) is excellent also in this point.
- the frequency of the minimum impedance value when the load circuit LD is short-circuited is higher.
- the maximum impedance value when the load circuit LD is open and the minimum impedance value when the load circuit LD is short-circuited are substantially the same frequency, but the frequency of the minimum impedance value when the load circuit LD is short-circuited is slightly higher. . At these times, power transmission efficiency is high and relatively large output possible power can be obtained.
- the installation range of the power receiving device 20 to the power transmitting device 10 is large, the power transmission efficiency and the output power can be reduced as shown in (a2) and (b2) due to the change in the coupling capacitance Cm. It may be easy to do.
- the example of (c2) is suitable when the installable range of the power receiving device 20 with respect to the power transmitting device 10 is relatively narrow.
- the minimum impedance value when the load circuit LD is short-circuited exists between an impedance maximum value when the load circuit LD is open and an intermediate value between the impedance minimum value when the load circuit LD on the higher frequency side is open. It is preferable to make it.
- (A1), (a2), (b1), (b2) are comparative examples.
- the frequency of the minimum impedance value when the load circuit LD is short-circuited is smaller than the frequency of the maximum impedance value when the load circuit LD is open.
- the deviation of the power transmission efficiency with respect to the frequency is larger than in the cases of (c2), (d2), and (e2). For this reason, when the resonance frequency changes, the power transmission efficiency tends to decrease.
- the deviation of the power transmission efficiency with respect to the frequency is larger than in the case of (b2). Therefore, when the resonance frequency changes due to a change in the coupling capacitance Cm or the like, the power transmission efficiency is more likely to be reduced. Also, the output power is close to zero.
- the frequency of the AC voltage output from the signal source SG is set to a frequency that maximizes the power transmission efficiency. This is effective when the suppliable power in the power transmission system is less than the power used by the load circuit LD of the power receiving device 20.
- the frequency of the AC voltage output from the signal source SG may be set to a frequency at which suppliable power in the power transmission system is maximized. This is effective when it is desired to increase the suppliable power in the power transmission system as much as possible, such as when the power consumption of the load circuit LD of the power receiving device 20 is large.
- the power transmission system includes: A power transmission system that transmits power from the power transmission device 10 to the power reception device 20 by an electric field coupling method,
- the power transmission device 10 At least a pair of power transmission electrodes Et1, Et2, A power transmission side inductor L1, A signal source SG that applies an AC signal to the power transmission electrodes Et1 and Et2 via the power transmission side inductor L1,
- the capacitor C1 formed between the power transmission electrodes Et1 and Et2 and the power transmission side inductor L1 constitute a series resonance circuit
- the power receiving device 20 At least a pair of power receiving electrodes Er1, Er2, A power receiving side inductor L2, Including a power receiving inductor L2 and a load circuit LD connected in parallel;
- the capacitor C2 formed between the power receiving electrodes Er1 and Er2 and the power receiving inductor L2 constitute a parallel resonance circuit
- the composite resonance is such that the impedance of the composite resonance circuit viewed from the signal source SG side becomes higher than the resonance frequency when the input terminals of the load circuit LD are open.
- the impedance of the circuit component is set.
- the impedance of the components of the composite resonant circuit is The resonance frequency at which the impedance of the composite resonance circuit viewed from the signal source SG side is minimized in a state where the input terminals of the load circuit LD are short-circuited in a predetermined facing state in which the combined capacitance is maximum has the maximum combined capacitance.
- the impedance is higher than the resonance frequency at which the impedance of the composite resonant circuit viewed from the signal source SG side is maximized with the input terminals of the load circuit LD open, and the combined capacitance is maximized.
- the resonance frequency of the composite resonance circuit viewed from the signal source SG side is lower than the resonance frequency that is higher than the resonance frequency that is the maximum among the resonance frequencies that become the minimum.
- the impedance of the components of the composite resonant circuit is When the power transmission electrodes Et1 and Et2 of the power transmission device 10 and the power reception electrodes Er1 and Er2 of the power reception device 20 face each other within a predetermined position range, the resonance frequency that becomes the maximum and the resonance frequency that becomes the minimum It is set so that the high-low relationship is satisfied.
- the inductance (impedance) of the inductance L1 as a component of the composite resonance circuit may be set. Moreover, you may set the impedance of the other component in the composite resonance circuit.
- FIG. 4 is a diagram showing a specific example of the power transmission system of the present invention.
- the power transmission system includes a charging stand 100, a power receiving device 200, and an AC adapter 300.
- AC adapter 300 converts AC voltage into DC voltage and supplies it to charging stand 100.
- the AC adapter 300 converts an AC voltage of AC 100V into a DC voltage of DC 12V.
- the charging stand 100 corresponds to the power transmission device 10 in FIG.
- the power receiving device 200 corresponds to the power receiving device 20 in FIG. Specific configurations of the charging stand 100 and the power receiving device 200 will be described with reference to FIG.
- FIG. 5 is a diagram illustrating a circuit configuration of the charging stand 100 and the power receiving device 200.
- the same or corresponding elements as those in FIG. 1 are denoted by the same reference numerals. A description of the same components as those in FIG. 1 will be omitted as appropriate.
- the charging stand 100 of this specific example includes a signal source SG, a step-up transformer T1, and a pair of power transmission electrodes Et1 and Et2.
- the signal source SG is configured by an inverter circuit that converts a DC voltage supplied from the AC adapter 300 into an AC voltage.
- the signal source SG generates an AC voltage of 100 kHz to 10 MHz, for example.
- the inverter circuit includes four field effect transistors (FETs) Q1, Q2, Q3, Q4, resistors R1, R2, R3, and a controller CONT.
- FETs field effect transistors
- the reference potential of the charging stand 100 is connected to the ground line from the AC adapter 300. Thereby, the reference potential of the charging stand 100 can be made equal to the ground potential. That is, the reference potential of the charging stand 100 can be determined.
- the resistor R1 limits the current flowing through the four field effect transistors (FETs) Q1, Q2, Q3, and Q4 to a predetermined current.
- the resistors R2 and R3 divide the DC voltage supplied from the AC adapter 300.
- the controller CONT inputs the DC voltage divided by the resistors R2 and R3, and controls the field effect transistors (FETs) Q1, Q2, Q3, and Q4 so that an AC voltage having a predetermined frequency and a predetermined voltage is output from the inverter circuit. Controls ON and OFF. Thereby, an alternating voltage having a predetermined frequency and a predetermined voltage is applied between the input terminals of the step-up transformer T1.
- the step-up transformer T1 boosts the AC voltage generated by the signal source SG, and applies the boosted AC voltage between the pair of power transmission electrodes Et1 and Et2 via the inductance L1.
- the inductor L1 is configured by a leakage inductance of the step-up transformer T1.
- the power transmission electrode Et1 constitutes a power transmission side active electrode
- the power transmission electrode Et2 constitutes a power transmission side passive electrode.
- a higher potential is applied to the power transmission side active electrode than to the power transmission side passive electrode.
- the pair of power transmission electrodes Et1 and Et2 constitute a capacitor C1.
- the power receiving device 20 of this specific example includes a pair of power transmission electrodes Et1, Et2, a step-down transformer T2, a rectifier circuit REC, a DC-DC converter CONV, and a load circuit LD.
- the power receiving electrode Er1 constitutes a power receiving side active electrode
- the power receiving electrode Er2 constitutes a power receiving side passive electrode.
- a higher potential is applied to the power transmission side active electrode than to the power transmission side passive electrode
- a higher potential is induced in the power reception side active electrode than in the power reception side passive electrode.
- the pair of power receiving electrodes Er1 and Er2 constitute a capacitor C2.
- the AC voltage boosted by the step-up transformer T1 between the pair of power transmission electrodes Et1 and Et2 of the charging stand 100 is By being applied, an alternating voltage is induced between the pair of power receiving electrodes Er1 and Er2 of the power receiving device 200. Thereby, electric power can be transmitted from the charging stand 100 to the power receiving device 200.
- the step-down transformer T2 steps down the alternating voltage induced between the pair of power receiving electrodes Er1 and Er2, and applies the stepped-down alternating voltage to the rectifier circuit REC.
- the step-down transformer T2 has an inductance L2 between the input and output.
- the inductor L2 may be configured by an excitation inductance of the primary winding of the step-down transformer T2.
- the one end side of the secondary winding of the step-down transformer T2 is grounded via a capacitor Cpl. Therefore, the one end side of the secondary winding of the step-down transformer T2 serves as a reference potential line.
- the rectifier circuit REC includes a plurality of diodes D and a capacitor C3, converts an AC voltage applied between a pair of input terminals into a DC voltage, and applies the DC voltage between input terminals of the DC-DC converter CONV.
- the DC-DC converter CONV converts the DC voltage output from the rectifier circuit REC into a predetermined DC voltage, for example, a DC voltage suitable for the load circuit LD, and outputs it.
- the load circuit LD uses a DC voltage output from the DC-DC converter CONV to execute a predetermined function of the load circuit LD.
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Abstract
Description
送電装置から受電装置に電界結合方式により電力を伝送する電力伝送システムであって、
送電装置は、
少なくとも一対の送電電極と、
送電側インダクタと、
送電電極に送電側インダクタを介して交流信号を印加する信号源とを含み、
送電電極間に形成されるキャパシタと送電側インダクタとは直列共振回路を構成し、
受電装置は、
少なくとも一対の受電電極と、
受電側インダクタと、
信号源から見て受電側インダクタと並列に接続された負荷回路とを含み、
受電電極間に形成されるキャパシタとインダクタとは並列共振回路を構成し、
送電装置の各送電電極と受電装置の各受電電極とが対向状態にあるときに、各送電電極と各受電電極との間の合成容量を介して直列共振回路と並列共振回路とを含む複合共振回路が構成され、
合成容量が最大となる所定の対向状態において、負荷回路の入力端を短絡した状態で信号源側から見た複合共振回路のインピーダンスが極小となる共振周波数が、合成容量が最大となる所定の対向状態において、負荷回路の入力端を開放した状態で信号源側から見た複合共振回路のインピーダンスが極大となる共振周波数よりも高くなるように、複合共振回路の構成要素のインピーダンスが設定されている。
まず、発明に至った経緯について説明する。電界結合方式の電力伝送システムの送電装置は少なくとも一対の送電電極を備え、受電装置は少なくとも一対の受電電極を備える。そして、各送電電極と各受電電極とが対向することにより、結合容量が生じる。この結合容量は、各送電電極と各受電電極とが対向したときの位置関係に応じて変化する。電力伝送システムが、直列共振回路と並列共振回路とを含み、かつ両回路が結合容量を介して結合される複合共振回路を構成している場合、結合容量の変化により、直列共振周波数及び並列共振周波数が変化する。つまり、直列共振周波数と並列共振周波数とが一致しなくなる。したがって、送電装置上への受電装置の設置可能位置が固定位置でなく一定の広さを有する範囲である場合、直列共振周波数と並列共振周波数とを一致させることは実質的に困難である。
以下、本発明の実施形態に係る電力伝送システムについて図面を参照して具体的に説明する。
図1は、実施形態に係る電力伝送システムの回路構成を示す図である。実施形態に係る電力伝送システムは、電界結合方式の電力伝送システムである。
を有する。
図2において、送電装置10のキャパシタC1とインダクタL1とは直列共振回路を構成する。受電装置20のキャパシタC2とインダクタL2とは並列共振回路を構成する。
複合共振回路の構成要素のインピーダンスの設定例について説明する。本例では、複合共振回路の構成要素のインピーダンスとして、送電装置10のインダクタL1のインダクタンスを設定する。この例について、図3A、図3Bを参照して説明する。
本発明に係る電力伝送システムは、
送電装置10から受電装置20に電界結合方式により電力を伝送する電力伝送システムであって、
送電装置10は、
少なくとも一対の送電電極Et1、Et2と、
送電側インダクタL1と、
送電電極Et1、Et2に送電側インダクタL1を介して交流信号を印加する信号源SGとを含み、
送電電極Et1、Et2間に形成されるキャパシタC1と送電側インダクタL1とは直列共振回路を構成し、
受電装置20は、
少なくとも一対の受電電極Er1、Er2と、
受電側インダクタL2と、
受電側インダクタL2と並列に接続された負荷回路LDとを含み、
受電電極Er1、Er2間に形成されるキャパシタC2と受電側インダクタL2とは並列共振回路を構成し、
送電装置10の各送電電極Et1、Et2と受電装置20の各受電電極Er1、Er2とが対向状態にあるときに、各送電電極Et1、Et2と各受電電極Er1、Er2との間の結合容量Cm(合成容量)を介して直列共振回路と並列共振回路とを含む複合共振回路が構成され、
結合容量Cm(合成容量)が最大となる所定の対向状態において、負荷回路LDの入力端子間を短絡した状態で信号源SG側から見た複合共振回路のインピーダンスが極小となる共振周波数が、合成容量が最大となる所定の対向状態において、負荷回路LDの入力端子間を開放した状態で信号源SG側から見た複合共振回路のインピーダンスが極大となる共振周波数よりも高くなるように、複合共振回路の構成要素のインピーダンスが設定されている。
複合共振回路の構成要素のインピーダンスは、
合成容量が最大となる所定の対向状態において、負荷回路LDの入力端子間を短絡した状態で信号源SG側から見た複合共振回路のインピーダンスが極小となる共振周波数が、合成容量が最大となる所定の対向状態において、負荷回路LDの入力端子間を開放した状態で信号源SG側から見た複合共振回路のインピーダンスが極大となる共振周波数よりも高く、かつ合成容量が最大となる所定の対向状態において、負荷回路LDの入力端子間を開放した状態で信号源SG側から見た複合共振回路のインピーダンスが極小となる共振周波数のうちの前記極大となる共振周波数よりも高い共振周波数よりも低くなるように、設定されている、
複合共振回路の構成要素のインピーダンスは、
送電装置10の各送電電極Et1、Et2と受電装置20の各受電電極Er1、Er2とが所定の位置範囲内で対向しているときにおいて、前記極大となる共振周波数と前記極小となる共振周波数との高低関係が満足されるように、設定されている。
次に、本発明の電力伝送システムの具体例について説明する。図4は、本発明の電力伝送システムの具体例を示す図である。
20 受電装置
100 充電台
200 受電デバイス
300 ACアダプタ
Et1、Et2 送電電極
Er1、Er2 受電電極
REC 整流回路
C1 キャパシタ
C2 キャパシタ
C3 キャパシタ
Caa 送電側アクティブ電極と受電側アクティブ電極との間の結合容量
Cpp 送電側パッシブ電極と受電側パッシブ電極との間の結合容量
Cm 結合容量
CONT コントローラ
CONV DC-DCコンバータ
D ダイオード
L1 インダクタ
L2 インダクタ
LD 負荷回路
Q1、Q2、Q3、Q4 FET
R1、R2、R3 抵抗
SG 信号源
T1 昇圧トランス
T2 降圧トランス
Claims (3)
- 送電装置から受電装置に電界結合方式により電力を伝送する電力伝送システムであって、
前記送電装置は、
少なくとも一対の送電電極と、
送電側インダクタと、
前記送電電極に前記送電側インダクタを介して交流信号を印加する信号源とを含み、
前記送電電極間に形成されるキャパシタと前記送電側インダクタとは直列共振回路を構成し、
前記受電装置は、
少なくとも一対の受電電極と、
受電側インダクタと、
前記信号源から見て前記受電側インダクタと並列に接続された負荷回路とを含み、
前記受電電極間に形成されるキャパシタと前記インダクタとは並列共振回路を構成し、
前記送電装置の各送電電極と前記受電装置の各受電電極とが対向状態にあるときに、各送電電極と各受電電極との間の合成容量を介して前記直列共振回路と前記並列共振回路とを含む複合共振回路が構成され、
前記合成容量が最大となる所定の対向状態において、前記負荷回路の入力端を短絡した状態で前記信号源側から見た前記複合共振回路のインピーダンスが極小となる共振周波数が、前記合成容量が最大となる所定の対向状態において、前記負荷回路の入力端を開放した状態で前記信号源側から見た前記複合共振回路のインピーダンスが極大となる共振周波数よりも高くなるように、前記複合共振回路の構成要素のインピーダンスが設定されている、
ことを特徴とする、電力伝送システム。 - 前記複合共振回路の構成要素のインピーダンスは、
前記合成容量が最大となる所定の対向状態において、前記負荷回路の入力端を短絡した状態で前記信号源側から見た前記複合共振回路のインピーダンスが極小となる共振周波数が、前記合成容量が最大となる所定の対向状態において、前記負荷回路の入力端を開放した状態で前記信号源側から見た前記複合共振回路のインピーダンスが極大となる共振周波数よりも高く、かつ前記合成容量が最大となる所定の対向状態において、前記負荷回路の入力端を開放した状態で前記信号源側から見た前記複合共振回路のインピーダンスが極小となる共振周波数のうち前記極大となる共振周波数よりも高い共振周波数よりも低くなるように、設定されている、
ことを特徴とする、請求項1記載の電力伝送システム。 - 前記複合共振回路の構成要素のインピーダンスは、
前記送電装置の各送電電極と前記受電装置の各受電電極とが所定の位置範囲内で対向しているときにおいて、前記極大となる共振周波数と前記極小となる共振周波数との前記高低関係が満足されるように、設定されている、
ことを特徴とする、請求項1または請求項2記載の電力伝送システム。
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JP6168254B2 (ja) * | 2015-02-26 | 2017-07-26 | 株式会社村田製作所 | 電圧検出回路、送電装置および電力伝送システム |
US10014781B2 (en) * | 2016-08-02 | 2018-07-03 | Abb Schweiz Ag | Gate drive systems and methods using wide bandgap devices |
KR20180085282A (ko) * | 2017-01-18 | 2018-07-26 | 삼성전기주식회사 | 무선 전력 전송 장치 |
US11171517B2 (en) * | 2018-03-28 | 2021-11-09 | Panasonic Intellectual Property Management Co., Ltd. | Electrode unit, power transmitting device, power receiving device, and wireless power transmission system |
TWI741560B (zh) * | 2020-04-15 | 2021-10-01 | 國立中興大學 | 交流電源供應系統 |
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JP2009169327A (ja) * | 2008-01-21 | 2009-07-30 | Hitachi Displays Ltd | 電力伝送回路 |
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JP5177187B2 (ja) * | 2010-08-10 | 2013-04-03 | 株式会社村田製作所 | 電力伝送システム |
JP5614510B2 (ja) * | 2012-03-07 | 2014-10-29 | 株式会社村田製作所 | 電力伝送システムおよび送電装置 |
WO2014103430A1 (ja) * | 2012-12-27 | 2014-07-03 | 株式会社村田製作所 | ワイヤレス電力伝送システム |
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JP2009169327A (ja) * | 2008-01-21 | 2009-07-30 | Hitachi Displays Ltd | 電力伝送回路 |
JP2011083132A (ja) * | 2009-10-07 | 2011-04-21 | Takenaka Komuten Co Ltd | 電力供給システム |
WO2012101907A1 (ja) * | 2011-01-26 | 2012-08-02 | 株式会社村田製作所 | 電力伝送システム |
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CN204721100U (zh) | 2015-10-21 |
US9685794B2 (en) | 2017-06-20 |
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