WO2016190094A1 - Wireless power transmission system - Google Patents

Wireless power transmission system Download PDF

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Publication number
WO2016190094A1
WO2016190094A1 PCT/JP2016/063947 JP2016063947W WO2016190094A1 WO 2016190094 A1 WO2016190094 A1 WO 2016190094A1 JP 2016063947 W JP2016063947 W JP 2016063947W WO 2016190094 A1 WO2016190094 A1 WO 2016190094A1
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Prior art keywords
power receiving
power
loop
load
feeding
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PCT/JP2016/063947
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French (fr)
Japanese (ja)
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吉田史生
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株式会社村田製作所
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Priority to JP2015105329 priority
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Publication of WO2016190094A1 publication Critical patent/WO2016190094A1/en

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Abstract

This power supply device (101) is provided with a first resonance circuit which comprises a power supply loop-shape conductor (Lt) and a first capacitor, and with an inverter circuit which converts a DC input voltage into an AC voltage and applies this to the first resonance circuit. Each of power receiving devices (201A, 201B, 201C) is provided with: a second resonance circuit which includes a power receiving loop-shape conductor (Lr) for coupling with the power supply loop-shape conductor (Lt), and a second capacitor (Cr) connected in parallel with the power receiving loop-shape conductor (Lr); a rectifying and smoothing circuit which converts the AC voltage generated in the second resonance circuit to a DC voltage; and a load which is driven by the DC output voltage converted by the rectifying and smoothing circuit. In the power receiving devices (201A, 201B, 201C), the interval between the power receiving surface and the opening surface of the power receiving loop-shape conductor (Lr) varies with the magnitude of the load.

Description

Wireless power transmission system

The present invention relates to a wireless power transmission system for transmitting power wirelessly from the power supply device to the power receiving device.

Recently, with the aim of practical use of wireless power supply, it is activating research to reduce the power loss of the entire system. In particular, power form the electromagnetic field resonant field by the resonance mechanism and the power receiving resonance mechanism, in a system that performs wireless power supply by electromagnetic resonance coupling, unlike the method of providing a high-frequency magnetic field in the resonator, and to simplify the process of power feeding possible to reduce power loss (see Patent Document 1).

Further, the wireless power feeding system configured to power simultaneously wirelessly from one transmitting device to a plurality of power receiving devices are shown in US Pat.

International Publication No. WO 2012/101905 International Publication No. WO 2013/035188

From one of the power transmission apparatus, when powered wirelessly to a plurality of power receiving apparatus, if the magnitude of the load of the power receiving device (light and heavy) are different, in the system shown in Patent Document 2, by performing mutual communication in advance , tune the resonant frequency of the resonant circuit for each power receiving apparatus, the power receiving apparatus to be able to receiving the optimal power.

However, the communication with each power receiving apparatus transmitting apparatus, the method for determining the resonant frequency of the resonant circuit in each power receiving device, a variable inductor or a variable for optimum resonance frequency in accordance with the placement state of the power transmission apparatus it is necessary to tune with the capacitor, the system becomes complex and high cost.

Further, from one feeding device, when the light and heavy loads are power transmission to different power receiving apparatus, due to the severity of the load is different for each load device, aimed frequency bands (in a wireless power transmission is generally to receiving voltage ends up changing in 6.78MHz), as a result, it may not be supplied a desired voltage (power) to the power receiving side. If, in order to obtain a desired voltage (power), and the voltage converter, the dummy resistor or the like, providing a circuit that consumes excessive power, the power receiving device is increased in size, becomes an obstacle to miniaturization.

An object of the present invention, while high maintaining wireless power transmission efficiency, when transferring power wirelessly from one feeding device to a plurality of power receiving apparatus, in a more simple and compact structure capable, load of each power receiving apparatus and to provide a wireless power transmission system capable of supplying electric power suitable for.

(1) wireless power transmission system of the present invention,
A feeding loop conductor having an inductance, a first resonant circuit including a first capacitor connected to the power-feeding loop conductor,
An inverter circuit for applying to said first resonant circuit converts the DC input voltage into an AC voltage,
A power supply device having,
Has an inductance, a power receiving loop-shaped conductor for coupling with the feeding loop-shaped conductor, and a second resonant circuit including a second capacitor connected in parallel to the power receiving loop-shaped conductor,
A rectifying and smoothing circuit for converting an AC voltage generated in the second resonant circuit to a DC voltage, a load driven by the converted DC output voltage by the rectifying and smoothing circuit,
A plurality of power receiving devices each having,
In a wireless power transmission system configured,
The feeding device comprises a feeding plane in which the opening surface of the power-feeding loop conductor faces,
Wherein the plurality of power receiving apparatus, the opening surface of the power receiving loop-shaped conductor are opposed, provided with a power receiving surface to be placed on the feeding surface,
Wherein the plurality of power receiving apparatus, the load is relatively a first type power receiving device is a light load, the load is second type power receiving device is relatively heavy load than the load of the first type power receiving device and, it includes,
The distance between the opening face and the receiving face of the receiving loop-shaped conductor of the first type power receiving unit d1, the distance between said opening face and said receiving surface of the power receiving loop-shaped conductor of the second type power receiving device expressed respectively d2, characterized in that it is a relationship d1> d2.

With the above structure, the distance between the power receiving loop conductor and the feeding loop conductor, becomes a distance corresponding to the severity of the load of the power receiving device, power suitable to each load is supplied.

(2) In the above (1), it is preferable that the feeding surface which is divided for each area where the power receiving device is placed. Thus, the power receiving loop-shaped conductor to which position in the opening plane of the feeding loop conductor can predict opposed, becomes easier to set the received power and receiving voltage gain.

(3) above (1) or (2), an opening surface of the first type power receiving said power receiving loop conductor S1 the area of ​​the opening surface of the device, the power receiving loop conductor of the second type power receiving device expressed each area of ​​the at S2, preferably in the relationship of S1 <S2. Thus, even if there is a limit to the height direction, the coupling coefficient can be easily lowered by designing the area of ​​the power receiving loop-shaped conductor so as to decrease with decreasing light loads.

(4) In any one of (1) to (3), the number of turns the power receiving loop-shaped conductor of the first type power receiving device n1, the turn of the power receiving loop-shaped conductor of the second type power receiving device expressed respectively the number n2, it is preferable that a relationship of n1 <n2. Thus, even if there is a limit to the area of ​​the receiving surface of the receiving device, the number of turns of the power receiving loop-shaped conductor, by reducing the more becomes a light load, it is possible to lower the coupling coefficient easily.

According to the present invention, even when a plurality of types of power receiving devices having different light and heavy loads are present, power suitable to the load of each power receiving apparatus is supplied.

Figure 1 is a schematic perspective view of a wireless power transmission system 301 according to the first embodiment. Figure 2 is a schematic front view of a wireless power transmission system 301. Figure 3 is a circuit diagram of a wireless power transmission system 301. Figure 4 is a circuit diagram of another wireless power transmission system 301V according to the first embodiment. Figure 5 is a wireless power transmission system 301, the frequency characteristic of the voltage gain is the ratio of the DC output voltage to a DC input voltage, how varying or simplified circuit for explaining the difference in the equivalent resistance of the load it is a diagram. 6 is an equivalent circuit diagram of a wireless power transmission system 301. Figure 7 (A) (B) (C) is a schematic diagram showing the resonance characteristics of multiple resonance. Figure 8 is an equivalent resistance = 100 [Omega (large value) load conditions Ro, shows the frequency characteristic of the voltage gain when changing the coupling coefficient k between the feeding loop conductor Lt and receiving loop-shaped conductor Lr it is a diagram. Figure 9 shows an equivalent resistance value = 1 [Omega (small value) load conditions Ro, the frequency characteristic of the voltage gain when changing the coupling coefficient k between the feeding loop conductor Lt and receiving loop-shaped conductor Lr it is a diagram. Figure 10 is a diagram showing the relationship between coupling coefficient k and the voltage gain of the power-feeding loop conductor Lt and receiving loop-shaped conductor Lr. Figure 11 (A) is a plan view of a power feeding device 102A according to the second embodiment, FIG. 11 (B) is a schematic front view showing an internal structure of the power feeding device 102A. Figure 12 is a schematic perspective view of a wireless power transmission system 302 according to the second embodiment. Figure 13 is a plan view of a power feeding device 102B according to the second embodiment. Figure 14 is a schematic perspective view of a wireless power transmission system 303 according to the third embodiment. Figure 15 is a schematic perspective view of a wireless power transmission system 304 according to the fourth embodiment.

Later, by way of some specific examples with reference to the drawings showing a plurality of embodiments of the present invention. During each of the drawings are denoted by the same reference numerals to the same portions. Considering the ease of Key to or understanding, showing separately for convenience embodiments are possible partial replacement or combination of structure shown in different embodiments. In the second and subsequent embodiments is omitted the description of the common matters in the first embodiment, only different points will be explained. In particular, not sequential mentioned each embodiment the same effect by the same configuration.

"The first embodiment"
Figure 1 is a schematic perspective view of a wireless power transmission system 301 according to the first embodiment. Figure 2 is a schematic front view of a wireless power transmission system 301. The wireless power transmission system 301 includes a single power supply device 101 a plurality of power receiving apparatus 201A, 201B, and 201C. The power supply apparatus 101 is a game board, such as shogi board, the power receiving apparatus 201A, 201B, 201C, etc. is a device such as shogi pieces.

The power supply apparatus 101, as shown later, has a first resonant circuit and the inverter circuit, the power receiving device 201A, 201B, 201C has a second resonant circuit, the rectification smoothing circuit and a load, respectively. Load is, for example, LED, IC, a motor or the like.

The AC adapter 13 to the power supply apparatus 101, a predetermined DC power source voltage is input. The power supply apparatus 101 includes a feeding loop conductor Lt. The power receiving apparatus 201A, 201B, 201C includes a power receiving loop conductor Lr is coupled via a main magnetic field and feeding the loop-shaped conductor Lt, and a second capacitor Cr connected in parallel to the power receiving loop-shaped conductor Lr a second resonant circuit.

The power supply apparatus 101 includes a feeding surface S10 of the opening face of the feeding loop conductor Lt faces. A plurality of power receiving apparatus 201A, 201B, 201C, the opening surface facing the power receiving loop conductor Lr, comprises a receiving surface S20 that is placed on the feeding surface S10.

The power receiving apparatus 201A, 201B, 201C have their receiving surface S20 is placed in contact with the feed surface S10 in the power supply apparatus 101. For example, when the power receiving device 201A is placed on the power supply device 101, power feeding apparatus 101 to the wireless power transmission to the power receiving apparatus 201A.

Spacing of the opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201A and the power receiving surface S20 is da, spacing of the opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201B and the power receiving surface S20 is db, spacing of the opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201C and the power receiving surface S20 is dc. As described later, the distance between the power receiving loop conductor Lr and the feeding loop conductor Lt is, have a distance corresponding to the severity of the load of the power receiving device, each load is supplied power suitable for the that. Power receiving apparatus 201C has an LED as a load, a first type power receiving device relatively light load. The power receiving apparatus 201A is a load motor, a second type power receiving device of a heavy load than the load of the power receiving apparatus 201C. The power receiving apparatus 201B is a device to load the IC, a light load than the power receiving apparatus 201A, a heavy load than the power receiving apparatus 201C.

Figure 3 is a circuit diagram of a wireless power transmission system 301. A plurality of power receiving apparatus 201A, 201B, the electric circuit of 201C is similarly represented, the power receiving device, here represents one of the power receiving device 201 that represents.

The power supply apparatus 101 includes a first resonant circuit 10 comprising a feeding loop conductor Lt having an inductance, and a first capacitor Ct connected in series to the feeding loop conductor Lt. Further, an inverter circuit 11 to be applied to the first resonant circuit 10 converts the DC input voltage Vi into an AC voltage. The inverter circuit 11 includes switching elements Q1, Q2, capacitor C11, diode D1 and the drive circuit 12. Driving circuit 12 on / off driven alternately switching elements Q1, Q2 at a predetermined operating frequency (e.g., 6.78MHz). Resonance frequency of the first resonant circuit 10 is the frequency of the operating frequency or the vicinity thereof.

Power receiving device 201 has an inductance, a feeding loop conductor Lt and receiving loop-shaped conductor Lr mainly bound via a magnetic field, and a second capacitor Cr connected in parallel to the power receiving loop-shaped conductor Lr a second resonant circuit 20 including. Also includes a rectifier smoothing circuit 21 for converting an AC voltage generated in the second resonant circuit 20 to a DC voltage, and a load Ro driven by the converted DC output voltage by rectifying and smoothing circuit 21. Rectifying and smoothing circuit 21 includes a rectifier circuit 22 by a diode bridge circuit, a smoothing capacitor C21, C22, and a voltage regulator circuit 23.

The second resonant circuit 20 is in parallel resonance at the frequency of the operating frequency or the vicinity thereof. Resonance voltage of the second resonance circuit 20 is full-wave rectified by the rectifier circuit 22 is smoothed and stabilized by a smoothing capacitor C21, C22, and a voltage regulator circuit 23 supplies a predetermined constant voltage to the load Ro.

Figure 4 is a circuit diagram of another wireless power transmission system 301V in the present embodiment. In this example, the diode D1 in the power receiving apparatus 201 constitute a rectifying circuit. Rectifier circuit 22 shown in FIG. 3 whereas a full-wave rectifier circuit, a diode D1 shown in FIG. 4 is a half-wave rectifier circuit. The other structure is the same as the wireless power transmission system 301 shown in FIG.

5, the wireless power transmission system 301, the frequency characteristic of the voltage gain is the ratio of the DC output voltage Vo with respect to the DC input voltage Vi is, how changing or for explaining the difference in the equivalent resistance of the load it is a simplified circuit diagram. Also, FIG. 6 is an equivalent circuit diagram.

5 and 6, the power transmitting AC voltage generator ALT corresponds to the inverter circuit 11. Further, 5 and 6 represent the rectifying smoothing circuit 21 of the power receiving device 201 and the load Ro is one of the load Ro. Power receiving loop conductor Lr and the feeding loop conductor Lt is magnetically coupled.

6, assuming that the impedance of the transmission alternating voltage generator ALT is negligibly small, the first resonant circuit according to the first capacitor Ct and an inductor {(Lt-Lm) + Lm} is constituted. Further, when the equivalent resistance of the load is small, the second capacitor Cr and inductor {(Lr-Lm) + Lm} by the second resonant circuit.

Thus, there are two resonant circuits, because it binds via the mutual inductance Lm, composite resonance circuit is formed, the resonance mode of the even and odd modes occurs.

Here, represents the inductance of the power receiving loop-shaped conductor Lr an inductance of the feeding loop conductor Lt both in L, the first capacitor Ct, is represented by both the capacitance C of the second capacitor Cr, the following two the resonance frequency f1 ', f1 "occurs.

f1 '= 1 / (2π√ (L + Lm) C)
f1 "= 1 / (2π√ (L-Lm) C)
Lt the self-inductance of the feeding loop conductor Lt, Lr the self-inductance of the power receiving loop-shaped conductor Lr, to represent the coupling coefficient k, mutual by coupling with the feeding loop conductor Lt and receiving loop-shaped conductor Lr inductance Lm is,
Lm = the relationship of k√ (Lt · Lr).

Figure 7 (A) (B) (C) is a schematic diagram showing a resonance characteristic by the multiple resonance. Both the horizontal axis represents the frequency and the vertical axis represents the voltage gain is the ratio of the DC output voltage to a DC input voltage. 7 (A) is the time when the mutual inductance Lm is ≒ 0, the unimodal. Figure 7 (C) is a characteristic when the mutual inductance Lm is large, the bimodal. Figure 7 (B) is a characteristic when the mutual inductance Lm is medium, is substantially unimodal.

Is large equivalent resistance value of the load Ro as shown in FIG. 6, that is, when a light load, since multiple resonance occurs, the frequency characteristic of the voltage gain becomes bimodal as shown in FIG. 7 (C). When the equivalent resistance of the load Ro is low, i.e. when it is heavily loaded, since not occur multiple resonance, the frequency characteristics of voltage gain, unimodal voltage gain becomes a peak at the resonance frequency of the first resonant circuit to become.

Accordingly, the equivalent resistance of the load is large, and when the coupling coefficient (degree of coupling) k is large, the voltage gain is the ratio of the DC output voltage to a DC input voltage becomes bimodal, when the equivalent resistance value of the load is small, or, when the coupling coefficient (degree of coupling) k is small, the frequency characteristic of the voltage gain becomes unimodal.

8, FIG. 9 is a diagram showing the frequency characteristic of the voltage gain when changing the coupling coefficient k between the feeding loop conductor Lt and receiving loop-shaped conductor Lr. Figure 8 is a characteristic when the load Ro of equivalent resistance = 100 [Omega (large value), FIG. 9 is a characteristic when the equivalent resistance value = 1 [Omega load Ro (small value). Both have a coupling coefficient k is changed in five stages from 0.01 to 0.65.

Is large equivalent resistance of the load, as appearing in FIG. 8, occurs composite resonance described above, the frequency characteristic of the voltage gain becomes bimodal.

8, in the example shown in FIG. 9, if the operating frequency is 6.78MHz, the equivalent resistance is small power receiving device of the load, for any of the equivalent resistance value is large power receiving device of the load, the coupling coefficient k is a certain smaller than the threshold (Fig. 8, k <0.1 in the example shown in FIG. 9), as the coupling coefficient k is small, the voltage gain becomes small. Then, as the coupling coefficient k is greater than the threshold value, the peak frequency of the voltage gain is shifted to the high-frequency voltage gain becomes smaller again.

Figure 10 is a diagram showing the relationship between coupling coefficient k and the voltage gain of the power-feeding loop conductor Lt and receiving loop-shaped conductor Lr. The coupling coefficient k is less than the threshold value 0.1, the coupling coefficient and the voltage gain is in positive correlation. In the present embodiment, by utilizing the characteristics of this portion, as coupling coefficient corresponding to the received power of the power reception device is obtained, the distance between the power receiving loop conductor Lr and the feeding loop conductor Lt, the power receiving device It is of a distance corresponding to the severity of the load.

1, shown in FIG. 2, the distance between the power receiving loop conductor Lr and the feeding loop conductor Lt has a distance corresponding to the severity of the load of the power reception device.

Load Ro of the power receiving apparatus 201A is an equivalent resistance is small heavy load. That is, the power receiving apparatus 201A is a second type power receiving device. Therefore, by reducing the distance da of the opening surface of the power-receiving loop conductor Lr of the power receiving apparatus 201A and the power receiving surface S20, to increase the coupling coefficient k. Thus, the voltage gain increases. The larger the voltage gain, the DC output voltage Vo becomes high, the power supplied to the load Ro (receiving power) increases.

Load Ro of the power receiving apparatus 201C is an equivalent resistance is large light load. That is, the power receiving apparatus 201C is first type power receiving device. Therefore, by increasing the distance dc opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201C and the power receiving surface S20, to decrease the coupling coefficient k. Thus, the voltage gain becomes small. The smaller the voltage gain DC output voltage Vo is lowered, the power supplied to the load Ro (received power) is reduced.

Load Ro of the power receiving apparatus 201B is moderate equivalent resistance. Therefore, the distance db of the opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201B and the power receiving surface S20, and smaller than the interval dc opening surface of the power receiving loop-shaped conductor Lr of the power receiving apparatus 201C and the power receiving surface S20 , to be greater than distance da of the opening surface of the power-receiving loop conductor Lr of the power receiving apparatus 201A and the power receiving surface S20, it is moderately coupling coefficient k. Thus, the voltage gain becomes moderate, the received power becomes moderate.

Accordingly, the three intervals is the relationship da <db <dc. This is, the power receiving apparatus 201A, 201B, suitable for each load Ro of 201C (required) power is supplied.

Further, since the frequency characteristic approaches unimodal set of the received power and receiving voltage gain is likely to. In particular, when arranging a plurality of power receiving apparatus to the power transmission device, since the power receiving device increases the change of the frequency characteristic compared to the case of the singular set of receiving voltage gain becomes complicated. The resonance frequency of the power receiving device is set to the operating frequency, the frequency characteristics can be reduced difficulty of setting the receiving voltage gain by adjusting the spacing within an amount of unimodal.

"The second embodiment"
In a second embodiment, shown for different wireless power transmission system configuration of the power feeding apparatus in the first embodiment.

Figure 11 (A) is a plan view of a power feeding device 102A according to the second embodiment, FIG. 11 (B) is a schematic front view showing an internal structure of the power feeding device 102A. Feeding surface S10 in the power feeding device 102A is the partition line GL, is divided into four regions G11, G12, G21, G22 the power receiving device is placed. The power supply device 102A, comprising feeding loop conductor Lt, first capacitor Ct, the inverter circuit 11 and the DC input terminals 14,.

Figure 12 is a schematic perspective view of a wireless power transmission system 302 according to the second embodiment. The power receiving apparatus 202A, 202B, 202C are placed on one of the four areas of the feeding surface S10 in the power feeding device 102A. The power receiving apparatus 202A, 202B, configuration of 202C is the same as the power receiving device 201A, 201B, 201C shown in the first embodiment. Configuration of the power supply device 102A is the same as the power supply apparatus 101 shown in the first embodiment.

Figure 13 is a plan view of a power feeding device 102B according to the second embodiment. Feeding surface of the feeding device 102B includes the partition line GL, is divided into the power receiving device nine areas is placed G11, G12, G13, G21, G22, G23, G31, G32, G33. Configuration of the power supply device 102B is the same as the power supply apparatus 101 shown in the first embodiment.

According to this embodiment, the power receiving loop-shaped conductor to which position of the opening plane of the feeding loop conductor can predict opposed, becomes easier to set the received power and receiving voltage gain.

"Third Embodiment"
In a third embodiment, shown for different wireless power transmission system configuration of the power receiving apparatus in the first embodiment.

Figure 14 is a schematic perspective view of a wireless power transmission system 303 according to the third embodiment. The power receiving apparatus 203A, 203B, 203C are placed on one of the four areas of the feeding surface S10 in power supply apparatus 103. Configuration of the power supply apparatus 103 is the same as the power supply device 102A shown in the second embodiment.

The power receiving apparatus 203A, 203B, the received power of 203C Wa, Wb, expressed in Wc, the relation of Wa> Wb> Wc. That is, the power receiving apparatus 203C is first type power receiving device, the power reception device 203A is a second type power receiving device. Such according to a difference in the received power, the power receiving apparatus 203A, 203B, the area of ​​the opening surface of the power receiving loop-shaped conductor Lr of 203C different from each other. The power receiving apparatus 203A, 203B, there an opening area of ​​the power receiving loop-shaped conductor Lr of 203C Sa, Sb, expressed in Sc, the relation of Sa> Sb> Sc. Further, in the present embodiment, the height from the power receiving surface S20 in the power receiving apparatus to the power receiving loop conductor Lr different. The power receiving apparatus 203A, 203B, da the height to the power receiving loop-shaped conductor Lr from the power receiving surface S20 in 203C, db, is represented by dc, a relationship of da <db <dc.

Thus, the area of ​​the power receiving loop conductor Lr By designing such decrease with decreasing light load, it is possible to lower the coupling coefficient easily. Even if the height of the power receiving apparatus is limited, this structure can be applied.

"Fourth Embodiment"
In the fourth embodiment, showing the different wireless power transmission system configuration of the power receiving apparatus in the first embodiment.

Figure 15 is a schematic perspective view of a wireless power transmission system 304 according to the fourth embodiment. The power receiving apparatus 204A, 204B, 204C are placed on one of the four areas of the feeding surface S10 in power supply apparatus 104. Configuration of the power supply apparatus 104 is the same as the power supply device 102A shown in the second embodiment.

The power receiving apparatus 204A, 204B, the received power of 204C Wa, Wb, expressed in Wc, the relation of Wa> Wb> Wc. That is, the power receiving apparatus 204C is first type power receiving device, the power reception device 204A is a second type power receiving device. Such according to a difference in the received power, the power receiving apparatus 204A, 204B, the number of turns of the power receiving loop-shaped conductor Lr of 204C different from each other. The power receiving apparatus 204A, 204B, na the number of turns of the power receiving loop-shaped conductor Lr of 204C, nb, expressed in nc, the relation of na> nb> nc.

Thus, by designing the number of turns of the power receiving loop-shaped conductor Lr to many more become a heavy load, it is possible to increase the coupling coefficient easily. Even if the bottom area of ​​the power receiving apparatus is limited, this structure can be applied.

Finally, the description of the above embodiments, an example in all respects and not restrictive. Variations and modifications are possible as appropriate to those skilled in the art. For example, it is possible partial replacement or combination of structure shown in different embodiments. The scope of the invention, rather than the embodiments described above, indicated by the appended claims. Moreover, the scope of the present invention is intended to include all modifications within the meaning and range of equivalency of the claims.

ALT ... transmission AC voltage generation circuit C11 ... capacitor C21, C22 ... smoothing capacitor Ct ... first capacitor Cr ... second capacitor D1 ... diodes G11, G12, G13, G21, G22, G23, G31, G32, G33 ... region GL ... partition line
Lm ... mutual inductance Lr ... power receiving loop conductor Lt ... feeding loop conductor Q1, Q2 ... switching element Ro ... Load S10 ... feeding surface S20 ... receiving surface 10 ... first resonant circuit 11 ... inverter circuit 12 ... driving circuit 13 ... AC adapter 14 ... DC input terminal 20 ... second resonant circuit 21 ... rectifying and smoothing circuit 22 ... rectifying circuit 23: voltage regulator circuit 101,102A, 102B, 103,104 ... feeding device 201,201A, 201B, 201C ... powered device 202A, 202B, 202C ... power receiving apparatus 203A, 203B, 203C ... power receiving apparatus 204A, 204B, 204C ... power receiving device 301,301V, 302,303,304 ... wireless power transmission system

Claims (4)

  1. A feeding loop conductor having an inductance, a first resonant circuit including a first capacitor connected to the power-feeding loop conductor,
    An inverter circuit for applying to said first resonant circuit converts the DC input voltage into an AC voltage,
    A power supply device having,
    Has an inductance, a power receiving loop-shaped conductor for coupling with the feeding loop-shaped conductor, and a second resonant circuit including a second capacitor connected in parallel to the power receiving loop-shaped conductor,
    A rectifying and smoothing circuit for converting an AC voltage generated in the second resonant circuit to a DC voltage, a load driven by the converted DC output voltage by the rectifying and smoothing circuit,
    A plurality of power receiving devices each having,
    In a wireless power transmission system configured,
    The feeding device comprises a feeding plane in which the opening surface of the power-feeding loop conductor faces,
    Wherein the plurality of power receiving apparatus, the opening surface of the power receiving loop-shaped conductor are opposed, provided with a power receiving surface to be placed on the feeding surface,
    Wherein the plurality of power receiving apparatus, the load is relatively a first type power receiving device is a light load, the load is second type power receiving device is relatively heavy load than the load of the first type power receiving device and, it includes,
    The distance between the opening face and the receiving face of the receiving loop-shaped conductor of the first type power receiving unit d1, the distance between said opening face and said receiving surface of the power receiving loop-shaped conductor of the second type power receiving device expressed respectively d2, wireless power transmission system, which is a relationship of d1> d2.
  2. The feeding plane is divided for each area where the power receiving device is placed, the wireless power transmission system according to claim 1.
  3. Expressed respectively the first one the power receiving loop conductor S1 is the area of ​​the opening surface of the power receiving device, the second type power receiving said power receiving loop conductor S2 is the area of ​​the opening surface of the device, S1 <S2 of a relationship, the wireless power transmission system according to claim 1 or 2.
  4. When the number of turns of the power receiving loop-shaped conductor of the first type power receiving device n1, represent respectively the number of turns of the power receiving loop conductor of the second type electric power receiving apparatus in n2, the relation of n1 <n2, wireless power transmission system according to any of claims 1 to 3.
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