JP2012019649A - Power supply device and wireless power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device and a wireless power supply system capable of significantly improving convenience by charging a portable device, that is carried in a housing body such as a bag, while it is housed in the bag.SOLUTION: A power supply device includes a power supply unit 21 capable of supplying power wirelessly, a bag 22 as a portable housing body, and a power source unit 23 for supplying operation power to the power supply unit 21. The power supply unit 21 includes a power transmission unit to which the operation power is supplied by the power source unit, and the portable housing body 22 fixingly houses at least the power supply unit 21 among the power supply unit 21 and the power source unit 23.

Description

  The present invention relates to a non-contact power supply type power supply apparatus and a wireless power supply system that supply and receive power in a contactless (wireless) manner applicable to a storage body such as a bag.

An electromagnetic induction method is known as a method for supplying power wirelessly.
In recent years, wireless power feeding and charging systems using a method called a magnetic field resonance method using an electromagnetic resonance phenomenon have attracted attention.

  Currently, the electromagnetic induction type non-contact power feeding method that is already widely used needs to share the magnetic flux between the power supply source and the power supply destination (power receiving side). Must be placed in close proximity, and alignment of the bond is also important.

On the other hand, the non-contact power supply method using the electromagnetic resonance phenomenon can transmit power at a greater distance than the electromagnetic induction method due to the principle of the electromagnetic resonance phenomenon, and transmission efficiency is low even if the alignment is somewhat poor. There is an advantage of not falling.
The electromagnetic resonance phenomenon includes an electric field resonance method in addition to a magnetic field resonance method.
The wireless power feeding system using the magnetic field resonance type does not require axial alignment and can increase the power feeding distance.

By the way, in recent years, carrying a small portable electronic device is increasing. These portable devices (portable devices) have a built-in secondary battery, and are generally used by supplying power periodically.
Electromagnetic induction type non-contact power supply technology has been put to practical use for shaving, toothbrushes, and the like.
These require precise alignment between the transmitting and receiving coils, and often have a cradle structure for fixing the position.

However, when charging, it is necessary to take out the portable electronic device that has been put in a bag and connect it to the charger.
Moreover, even if the non-contact power feeding technique using electromagnetic induction is used, the portable device still needs to be taken out of the bag and installed on the charging stand.

  An object of the present invention is to provide a power supply device and a wireless power supply system that can greatly improve convenience if a portable device that is carried in a storage body such as a bag can be charged while being put in the bag.

  A power supply device according to a first aspect of the present invention includes a power supply unit capable of supplying power wirelessly, a portable storage body, and a power supply unit that supplies operating power to the power supply unit. The power supply unit includes a power transmission unit to which operating power is supplied, and the portable storage unit stores at least the power supply unit among the power supply unit and the power supply unit.

  A wireless power feeding system according to a second aspect of the present invention includes a power feeding device and a power receiving device that receives power transmitted from the power feeding device in a magnetic resonance relationship, and the power feeding device wirelessly receives power. A power supply unit that can supply power, a portable storage body, and a power supply unit that supplies operating power to the power supply unit, the power supply unit including a power transmission unit to which operating power is supplied by the power supply unit, The portable storage body securely stores at least the power supply unit among the power supply unit and the power supply unit.

  According to the present invention, if a portable device that is carried in a storage body such as a bag can be charged while being put in the bag, the convenience can be greatly improved.

It is a figure which shows the example of a whole structure of the wireless electric power feeding system which concerns on the 1st Embodiment of this invention. It is a block diagram which shows the structural example of the transmission / reception system of the electric power of the wireless electric power feeding system which concerns on the 1st Embodiment of this invention. It is a figure which shows typically the relationship between the power transmission side coil and power receiving side coil of the wireless electric power feeding system which concerns on embodiment of this invention. It is a figure for demonstrating the principle of a magnetic field resonance system. It is a figure which shows the frequency characteristic of the coupling amount in a magnetic field resonance system. It is a figure which shows the relationship between the distance between resonance coils in a magnetic field resonance system, and a coupling amount. It is a figure which shows the relationship between the resonance frequency in the magnetic field resonance system, and the distance between resonance coils from which the maximum coupling amount is obtained. It is a block diagram which shows the structural example of the wireless electric power feeding system which concerns on the 2nd Embodiment of this invention. It is a block diagram which shows the structural example of the wireless electric power feeding system which concerns on the 3rd Embodiment of this invention. It is a block diagram which shows the structural example of the wireless electric power feeding system which concerns on the 4th Embodiment of this invention. It is a block diagram which shows the structural example of the wireless electric power feeding system which concerns on the 5th Embodiment of this invention. It is a block diagram which shows the structural example of the wireless electric power feeding system which concerns on the 6th Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The description will be given in the following order.
1. 1. First embodiment of wireless power feeding system 2. Second embodiment of wireless power supply system 3. Third embodiment of wireless power feeding system 4. Fourth embodiment of wireless power feeding system 5. Fifth embodiment of wireless power feeding system Sixth embodiment of wireless power supply system

<1. First Embodiment of Wireless Power Supply System>
1A and 1B are diagrams illustrating an example of the overall configuration of a wireless power feeding system according to a first embodiment of the present invention.
FIG. 2 is a block diagram illustrating a configuration example of a power transmission / reception system of the wireless power feeding system according to the first embodiment of the present invention.
FIG. 3 is a diagram schematically illustrating the relationship between the power transmission side coil and the power reception side coil of the wireless power feeding system according to the embodiment of the present invention.

  The wireless power feeding system 10 includes a power feeding device 20 and a power receiving device 30.

The power supply device 20 includes a power supply unit 21 that can supply power wirelessly, a bag 22 as a portable storage body that stores the power supply unit 21, and a mounting table 23 as a power supply unit.
Below, after explaining the structure of the bag 22 and the mounting table 23 as a power supply part, the structure and function of the electric power feeding part 21 and the power receiving apparatus 30 are demonstrated.

The bag 22, which is a portable storage body, has first power supply terminals 221 and 222 formed at the bottom thereof.
In the bag 22, for example, a power transmission element unit 211 including a power transmission coil is disposed on the side of the power feeding unit 21, and a power transmission circuit 212 is disposed near the bottom.

The mounting table 23 has an AC cable 231 that can be connected to a commercial power source.
On the mounting table 23, a bag 22, which is a portable storage body, is mounted, and driving power is supplied to the power feeding unit 21 in the bag 22 in contact with the first power supply terminals 221 and 222 of the bag 22. Possible second power supply terminals 231 and 232 (+, −) are formed.
The mounting table 23 as a power supply unit includes a converter 234 that converts AC power (AC) into DC power (DC).

  Next, the power feeding unit 21 and the power receiving device 30 that are applied to the above wireless power feeding system 10 will be described.

  The power feeding unit 21 includes a power transmission element unit 211 and a power transmission circuit 212 that receives operating power from the power source unit.

  The power transmission element unit 211 includes a power supply coil 2111 as a power supply element and a resonance coil 2112 as a resonance element. Although the resonance coil is also referred to as a resonance coil, it is referred to as a resonance coil in the present embodiment.

The feeding coil 2111 is formed by an air-core coil to which an alternating current is fed.
The resonance coil 2112 is formed by an air-core coil that is coupled to the power supply coil 2111 by electromagnetic induction, and when the resonance coil 312 of the power receiving device 30 matches the self-resonance frequency, the resonance coil 2112 becomes a magnetic resonance relationship and efficiently transmits power.

The power transmission circuit 212 generates high-frequency power for wireless power transmission.
Since the power transmission circuit 212 desirably generates high-frequency power with high efficiency, a switching amplifier or the like is used.
The high frequency power generated in the power transmission circuit 212 is fed (applied) to the power supply coil 2111 of the power transmission coil unit 211 through an impedance detector, a matching circuit, and the like (not shown).

The power receiving device 30 includes a power receiving element unit 31, a rectifier circuit 32, a voltage stabilization circuit 33, and a load 34.
The power receiving device 30 includes a secondary battery that is a load 34 such as a mobile phone.

  The power receiving element unit 31 includes a power supply coil 311 as a power supply element and a resonance (resonance) coil 312 as a resonance element.

The feeding coil 311 is fed with an alternating current from the resonance coil 312 by electromagnetic induction.
The resonance coil 312 is formed of an air-core coil that is coupled to the power supply coil 311 by electromagnetic induction. When the self-resonance frequency coincides with the resonance coil 2112 of the power supply unit 21 of the power supply device 20, the resonance coil 312 becomes a magnetic resonance relationship and efficiently receives power. .

  The rectifier circuit 32 rectifies the received AC power and supplies it to the voltage stabilization circuit 33 as direct current (DC) power.

  The voltage stabilization circuit 33 converts the DC power supplied from the rectifier circuit 32 into a DC voltage according to the specification of the electronic device that is the supply destination, and the stabilized DC voltage is applied to the load 34 that is the electronic device. Supply.

  Next, the principle of the magnetic field resonance method will be described.

[Principle of magnetic resonance method]
Next, the principle of the magnetic field resonance method will be described with reference to FIGS.

FIG. 4 is a diagram for explaining the principle of the magnetic field resonance method.
Here, the principle will be described with the feeding coil as the feeding element and the resonance coil as the resonance element.

The electromagnetic resonance phenomenon includes an electric field resonance method and a magnetic field resonance method. FIG. 4 shows a basic block in which the power supply side and the power reception side have a one-to-one relationship in a magnetic resonance type wireless (non-contact) power supply system. .
In association with the configuration in FIG. 1, the power supply side includes an AC power supply 212, a power supply element 2111, and a resonance element 2112, and the power reception side includes a resonance element 312, a power supply element 311, and a rectifier circuit 32.

The feed elements 2111, 311 and the resonance elements 2112, 312 are formed of air-core coils.
On the power feeding side, the power feeding element 2111 and the resonance element 311 are strongly coupled by electromagnetic induction. Similarly, on the power receiving side, the feeding element 311 and the resonance element 312 are strongly coupled by electromagnetic induction.
When the self-resonance (resonance) frequencies of the respective air-core coils that are the resonance elements 2112 and 312 on both the power supply side and the power reception side coincide with each other, the magnetic field resonance relationship is established, and the coupling amount is maximized and the loss is minimized.
An alternating current is supplied from the alternating current power supply 212 to the power feeding element 2111 and further induces a current in the resonance element 2112 by electromagnetic induction.
The frequency of the alternating current generated by the alternating current power supply 212 is set to be the same as the self-resonant frequency of the resonant element 2112 and the resonant element 312.
The resonance element 2112 and the resonance element 312 are arranged in a magnetic field resonance relationship, and AC power is supplied wirelessly (non-contact) from the resonance element 2112 to the resonance element 312 at the resonance frequency.
On the power receiving side, a current is supplied from the resonance element 312 to the power feeding element 311 by electromagnetic induction, and a direct current is generated and output by the rectifier circuit 32.

FIG. 5 is a diagram showing the frequency characteristics of the coupling amount in the magnetic field resonance method.
In FIG. 5, the horizontal axis indicates the frequency f of the AC power source, and the vertical axis indicates the coupling amount.

FIG. 5 shows the relationship between the frequency of the AC power supply and the coupling amount.
It can be seen from FIG. 5 that the magnetic resonance shows frequency selectivity.

FIG. 6 is a diagram showing the relationship between the distance between the resonance elements and the coupling amount in the magnetic field resonance method.
In FIG. 6, the horizontal axis indicates the distance D between the resonance elements, and the vertical axis indicates the coupling amount.

FIG. 6 shows the relationship between the distance D between the resonance element 2112 on the power supply side and the resonance element 312 on the power reception side and the coupling amount.
FIG. 6 shows that there is a distance D at which the coupling amount is maximum at a certain resonance frequency.

FIG. 7 is a diagram showing the relationship between the resonance frequency and the distance between the resonance elements that provides the maximum coupling amount in the magnetic field resonance method.
In FIG. 7, the horizontal axis represents the resonance frequency f, and the vertical axis represents the distance D between the resonance elements.

FIG. 7 shows the relationship of the distance D between the resonance element 2112 on the power supply side and the resonance element 312 on the power reception side that can obtain the resonance frequency and the maximum coupling amount.
FIG. 7 shows that the maximum coupling amount can be obtained by widening the resonance element interval when the resonance frequency is low and narrowing the resonance element interval when the resonance frequency is high.

As described above, the basic requirement of the present embodiment is to improve the convenience of the user by realizing wireless power feeding inside the bag 22.
Terminals (contact points) 231 and 232 are provided on a mounting table (sheet) 23 of the bag 22. The mounting table 23 is provided with an AC cable 231 and supplies power from a power outlet in a wired manner.
A contact is provided between the mounting table 23 and the bag 22, and power is supplied to the bag by wire. The power delivery here may be AC power or DC.
In the first embodiment, transfer is performed by direct current, and the AC / DC converter 234 is disposed inside the mounting table 23.
The bag 22 is provided with a power transmission circuit 212 and a power transmission element 211 that is a power transmission coil for non-contact power feeding.
On the other hand, the portable electronic device on the power receiving device 30 side includes a power receiving coil, a rectifying / smoothing circuit, a power supply stabilizing circuit, and the like, and can receive power in a non-contact manner and charge a secondary battery.

<2. Second Embodiment of Wireless Power Supply System>
FIG. 8 is a block diagram illustrating a configuration example of a wireless power feeding system according to the second embodiment of the present invention.

  The difference between the wireless power feeding system 10A according to the second embodiment and the wireless power feeding system 10 according to the first embodiment is a case where delivery is performed by alternating current, and the AC / DC converter 234 is disposed inside the bag 22. There is in being.

  Other configurations are the same as those of the first embodiment.

<3. Third Embodiment of Wireless Power Transfer System>
FIG. 9 is a block diagram illustrating a configuration example of a wireless power feeding system according to the third embodiment of the present invention.

The difference between the wireless power feeding system 10B according to the third embodiment and the wireless power feeding system 10 according to the first embodiment is that the AC / DC converter 234 is disposed inside the bag 22 and the AC cable 231 is also a bag. 22 is connected.
That is, in the third embodiment, the mounting table and the first power supply terminal are unnecessary.

<4. Fourth Embodiment of Wireless Power Supply System>
FIG. 10 is a block diagram illustrating a configuration example of a wireless power feeding system according to the fourth embodiment of the present invention.

Differences between the wireless power feeding system 10C according to the fourth embodiment and the wireless power feeding system 10 according to the first embodiment are as follows.
That is, in the wireless power feeding system 10 </ b> C, operation power is supplied from the mounting table 23 as a power supply unit not wirelessly but wirelessly (wirelessly).

The mounting table 23 </ b> C includes a converter 234 that converts AC power into DC power, and a second power transmission circuit (power transmission unit) 235 that can receive power from the converter 234 and transmit power wirelessly.
Similarly to the power feeding unit 21, the second power transmission unit 235 includes a power transmission circuit 2352 that receives operating power from the power transmission element unit 2351 and the converter 234.
Since the configuration and function of the second power transmission unit 235 are basically the same as those of the power feeding unit 21 described above, description thereof is omitted.
The power feeding unit 21 includes a power receiving unit 213 that receives the power transmitted from the second power transmitting unit 235 with a magnetic resonance relationship and supplies the received power as operating power to the power transmitting unit.
Since the configuration and function of the power receiving unit 213 are basically the same as those of the power receiving device 30 described above, description thereof is omitted.

As described above, in the fourth embodiment, a method is adopted in which contactless power is supplied between the bag 22 and the mounting table 23C, and the bag 22C is fed in a contactless manner as in the previous embodiment. The
In this case, the mounting table 23C has a non-contact power transmission circuit and a coil, the bag 22C has a power reception coil and a power reception circuit, and a power transmission circuit 212 and a coil element unit 211 for power supply in the bag 22C. Have
By doing so, non-contact power feeding can be performed between the mounting table 23C and the bag 22C, so that the electrical failure can be reduced without exposing the terminals.

<5. Fifth embodiment of wireless power supply system>
FIG. 11 is a block diagram illustrating a configuration example of a wireless power feeding system according to the fifth embodiment of the present invention.

Differences between the wireless power feeding system 10D according to the fifth embodiment and the wireless power feeding system 10 according to the first embodiment are as follows.
In the wireless power supply system 10D, storage units 225 and 226 including power supply units 21D-1 and 21D-2 corresponding to electronic devices are provided as the power receiving device 30 stored in the bag 22D.

When performing non-contact power feeding, the alignment between the transmitting and receiving coils can be roughened to some extent by using a magnetic field resonance type transmission method.
However, it is often the case that better power feeding efficiency can be obtained by aligning the coils.
For example, when one pocket of a bag is dedicated to a mobile phone and a power feeding coil is attached thereto, the position can be accurately aligned with the secondary power receiving coil attached to the mobile phone. Thereby, it becomes possible to transmit electric power more efficiently.
When there are a plurality of pockets, a plurality of power transmission coils can be attached. At that time, it is possible to prevent characteristic deterioration due to interference by changing the power transmission frequency for each pocket.
In this case, it is necessary to use a pocket (power transmission coil) determined for each frequency used.

<6. Sixth Embodiment of Wireless Power Supply System>
FIG. 12 is a block diagram illustrating a configuration example of a wireless power feeding system according to the sixth embodiment of the present invention.

Differences between the wireless power feeding system 10E according to the sixth embodiment and the wireless power feeding system 10 according to the first embodiment are as follows.
In the sixth embodiment, the outer peripheral portion of the bag 22E is formed of a metal member 237 that functions as an electric field shield portion, and the magnetic sheet 238 as a magnetic shield portion is formed on the outer peripheral portion.

For example, when a non-contact power supply function is mounted in the case of an aluminum attach case, the power supply characteristics may deteriorate due to the influence of aluminum metal.
In that case, it is possible to improve the characteristics by inserting a magnetic material inside the aluminum material.
In the case of such a structure, since the bag 22E has an electromagnetic shield structure, there is no leakage electromagnetic field to the outside, and high power can be supplied. At the same time, it is possible to handle a case where a large amount of electric power is required for applications such as charging to a plurality of electronic devices and rapid charging.

As described above, according to the present embodiment, the following effects can be obtained.
Portable electronic devices that are usually carried in bags can be charged without taking them out of the bag, which can greatly improve the convenience for the user.

  In each of the above embodiments, it is possible to apply a relay device that relays transmitted power and transmits power on the power receiving device 30 side.

  DESCRIPTION OF SYMBOLS 10,10A-10E ... Wireless electric power feeding system, 20 ... Electric power feeder, 21 ... Electric power feeding element part 211 ... Power transmission element part, 2111 ... Electric power feeding coil, 2112 ... Resonance coil, 212. ..Power transmission circuit, 22 ... bag (portable container), 30 ... power receiving device, 31 ... power receiving element section, 32 ... rectifier circuit, 33 ... voltage stabilizing circuit, 34. ··load.

Claims (14)

A power supply unit that can supply power wirelessly,
A portable storage body;
A power supply unit that supplies operating power to the power supply unit,
The power feeding part
Including a power transmission unit to which operating power is fed by the power source unit,
The portable storage body is
A power feeding device that securely stores at least the power feeding unit among the power feeding unit and the power source unit. The portable storage body is
A first power supply terminal is formed;
The power supply section
Connectable to a commercial power supply, the portable storage body is placed, driving power is supplied to the power supply unit in the portable storage body in contact with the first power supply terminal of the portable storage body. The power supply apparatus according to claim 1, further comprising a mounting table on which a second power supply terminal that can be supplied is formed. The mounting table for the power supply is
The power supply apparatus according to claim 2, further comprising a converter that converts AC power into DC power. The portable storage body is
The power feeding apparatus according to claim 2, further comprising a converter that converts AC power supplied through the first power supply terminal into DC power. The power supply section
It can be connected to a commercial power source, and includes a mounting table on which the portable storage body is mounted,
The table above is
A converter that converts AC power into DC power;
A second power transmission unit capable of receiving power from the converter and transmitting power wirelessly;
The power feeding part
The power feeding device according to claim 1, further comprising: a power receiving unit that receives the power transmitted by the power transmitting unit with a magnetic field resonance relationship and supplies the received power as operating power to the power transmitting unit. The portable storage body is
Each including a plurality of storage units in which the power transmission coil units are disposed;
The power feeding device according to claim 1, wherein power transmission frequencies of the power transmission coil units are different. The portable storage body is
The power supply device according to any one of claims 1 to 6, wherein the outer peripheral portion is formed of a metal member that functions as an electric field shield portion, and the magnetic shield portion is formed on the outer peripheral portion. A power supply device;
A power receiving device that receives the power transmitted from the power feeding device with a magnetic resonance relationship;
The power supply device
A power supply unit that can supply power wirelessly,
A portable storage body;
A power supply unit that supplies operating power to the power supply unit,
The power feeding part
Including a power transmission unit to which operating power is fed by the power source unit,
The portable storage body is
A wireless power feeding system that fixedly stores at least the power feeding unit among the power feeding unit and the power source unit. The portable storage body is
A first power supply terminal is formed;
The power supply section
Connectable to a commercial power supply, the portable storage body is placed, driving power is supplied to the power supply unit in the portable storage body in contact with the first power supply terminal of the portable storage body. The wireless power feeding system according to claim 8, further comprising a mounting table on which a second power supply terminal that can be supplied is formed. The mounting table for the power supply is
The wireless power feeding system according to claim 9, further comprising a converter that converts alternating current power into direct current power. The portable storage body is
The wireless power feeding system according to claim 9, further comprising a converter that converts AC power supplied through the first power supply terminal into DC power. The power supply section
It can be connected to a commercial power source, and includes a mounting table on which the portable storage body is mounted,
The table above is
A converter that converts AC power into DC power;
A second power transmission unit capable of receiving power from the converter and transmitting power wirelessly;
The power feeding part
The wireless power feeding system according to claim 8, further comprising a power receiving unit that receives the power transmitted by the power transmitting unit with a magnetic field resonance relationship and supplies the received power as operating power to the power transmitting unit. The portable storage body is
Each including a plurality of storage units in which the power transmission coil units are disposed;
The wireless power feeding system according to any one of claims 8 to 12, wherein power transmission frequencies of the power transmission coil units are different. The portable storage body is
The wireless power feeding system according to any one of claims 8 to 13, wherein the outer peripheral portion is formed of a metal member that functions as an electric field shield portion, and the magnetic shield portion is formed on the outer peripheral portion.

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