JP6403550B2 - Non-contact power feeding device - Google Patents

Description

  The present invention relates to a non-contact power supply device that performs non-contact charging for a power source device of an electric vehicle such as an electric vehicle or an electric wheelchair.

  A non-contact power feeding device used for charging a power supply device of an electric vehicle generally includes a primary side (hereinafter referred to as “power transmission”) winding portion of a separation transformer on a platform and a secondary side ( By providing a winding portion on the back side of the electric vehicle (hereinafter referred to as “power reception”), an induced electromotive force is excited in the secondary winding portion by the primary winding portion and the electric power is stored in the storage battery.

In such a separate transformer, if there is a positional deviation between the power transmission winding and the power receiving winding, the power feeding efficiency to the power receiving winding by the power transmission winding decreases due to insufficient magnetic coupling. .
Conventionally, in order to avoid such a situation, various measures have been taken taking the techniques disclosed in Patent Documents 1 to 4 below as examples.

The conventional technique has a problem that, for example, in order to quickly stop an electric vehicle in a limited power supply area where high power supply efficiency can be obtained, the driver needs to be highly skilled.
In addition, for the convenience of an unskilled driver, a space for installing a plurality of relatively large power transmission windings that can handle a large capacity receiving winding such as a non-contact power feeding device for an electric vehicle is provided. There is a problem that it must be secured.

  Even if a method of mechanically correcting the positional deviation using a driving means such as a motor is adopted, the driving device for moving the electric vehicle and the power transmission winding part becomes large, and it is difficult to secure an installation space. In addition, there is a problem that separate maintenance and inspection of the drive device is necessary.

JP-A-63-48102 Japanese Patent No. 4772744 Japanese Patent Laid-Open No. 10-215532 JP 2009-95072 A

  With regard to these, the applicant of the present application is able to obtain a relatively high power supply efficiency without requiring skill of operation for power supply work under a practical installation space of the power transmission winding section, and the contactless power supply in which the power supply efficiency is stable. In order to provide a non-contact power supply device that can perform the above, a patent application (Japanese Patent Application No. 2013-075510 “Non-contact power supply device”, hereinafter referred to as “prior application”) has already been filed.

The present invention is obtained by further applying a technique capable of obtaining a reasonable and stable adaptive range with respect to the positional deviation correction to the technique of the prior application.
In other words, the technology disclosed in the prior application does not show consideration for the position after correcting the displacement of the power transmission winding, and if the power transmission winding stays at the position offset correction destination, The adaptive distance that was sufficient at the time of deviation correction may not be able to cover the moving distance necessary for the next positional deviation correction.
In order to reliably perform positional deviation correction with respect to the power receiving winding portion disposed in a position range equal to the movable range of the power transmission winding portion, the adaptive distance of the position deviation correction is set to the power transmission winding. The maximum distance that can be covered within the movable range of the part must be extended, and if the application distance is increased in this way, there is a problem that the time required for correcting the misalignment becomes longer.
On the other hand, even if the power transmission winding part is reset (returned) to a reference position such as the center of the movable range after the positional deviation correction, a more complicated configuration may be required to properly do so. There was also a problem.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a non-contact power feeding device having a simple configuration that reliably returns the power transmission winding portion to the reference position of the movable range.

The non-contact power feeding device according to the present invention, which has been made to solve the above problems, includes a platform set on a road surface that allows passage and stopping of an electric vehicle, and an induced electromotive force in a power receiving winding unit included in the electric vehicle. A power transmission winding portion that excites attraction, a support that enables horizontal movement of the power transmission winding portion under the platform, a magnetic base that magnetically induces the power transmission winding portion in a central portion under the support, A shield plate interposed between the power transmission winding portion and the magnetic base; and an operation frequency adjusting means for changing an operation frequency of the power transmission winding portion . Here, “magnetic induction” means to induce to a predetermined place using the magnetic force (magnetic force) generated in the power transmission winding part.

In addition, the operating frequency adjusting means may be configured such that when the induced electromotive force and attractive force are excited in the power receiving winding portion, the magnetism excited by the power transmission winding does not pass through the shield plate, and the power transmission winding portion is The operating frequency is adjusted so that the magnetism excited by the power transmission winding portion passes through the shield plate when magnetically induced to the magnetic base.
That is, the operating frequency adjusting means determines the penetration depth of the magnetism excited in the power transmission winding portion when exciting the induced electromotive force and attractive force in the power receiving winding portion according to the material of the shield plate. The penetration depth is lower than that, and the penetration depth of the magnetism excited by the power transmission winding portion when magnetically inducing the power transmission winding portion to the magnetic base is set to be greater than the thickness depending on the material of the shield plate. Thus, the operating frequency of the power transmission winding is switched.

When a shield side wall that surrounds the sides of the power transmission winding part and the support is provided, and when a magnetic material such as iron is used for the shield side wall, the operating frequency adjusting means is guided to the power reception winding part. When the electromotive force and the attractive force are excited and when the power transmission winding is magnetically induced to the magnetic base, the operating frequency is adjusted so that the magnetism excited by the power transmission winding does not pass through the shield side wall.
That is, at that time, the operating frequency adjusting means is excited by the power transmission winding unit when exciting the induced electromotive force and attractive force in the power receiving winding unit and when magnetically inducing the power transmission winding unit to the magnetic base. The operating frequency of the power transmission winding is switched so that the penetration depth of the magnetic field is a penetration depth lower than the thickness depending on the material of the shield side wall.

  According to the non-contact power feeding device according to the present invention, the power transmission winding portion can be brought close to the power receiving winding portion by the magnetic force generated by the power transmission winding portion, and the positional deviation correction can be automatically performed. The effect | action which avoids later shaking can also be acquired.

The magnetic base that magnetically induces the power transmission winding portion in the central portion under the support, the shield plate interposed between the power transmission winding portion and the magnetic base, and the operating frequency of the power transmission winding portion are changed. By adopting a configuration including the operating frequency adjusting means, the power transmission winding portion can be returned to the reference position set at the center of the movable range each time the positional deviation correction operation is performed.
As a result, as long as the electric vehicle is stopped in a predetermined position range, the positional deviation correction is performed toward the position where the most efficient power feeding operation is surely performed. It will also contribute to shortening the time.

It is a flowchart which shows an example of the process performed with the non-contact electric power feeder by this invention. It is a process figure which shows an example of the position shift correction process performed with the non-contact electric power feeder by this invention. It is a process figure which shows an example of the position shift correction process performed with the conventional non-contact electric power feeder. An example of the magnetic flux generated at the time of (A): positional deviation correction and (B): at the time of reset of the non-contact power feeding device according to the present invention is shown together with a circuit diagram. It is a block diagram which shows the example of the platform of the non-contact electric power feeder by this invention. It is the schematic which shows an example of the magnetic flux which generate | occur | produces at the time of (A): position shift correction | amendment of the non-contact electric power feeder by this invention, and (B): reset. It is a table | surface which shows the example of the permeation | transmission state of the magnetic flux with respect to the operating frequency of a power transmission coil | winding part at the time of electric power feeding of the non-contact electric power feeder by this invention, a position shift correction | amendment, and a reset. It is an example of a braking means that can be employed in the non-contact power feeding device according to the present invention, (A): at the time of braking, (B): at the time of braking release, (C): front view of the main part at the start of braking. An example of the magnetic flux generated at the time of (A): positional deviation correction and (B): at the time of reset of the non-contact power feeding device according to the present invention is shown together with a circuit diagram.

Embodiments of a non-contact power feeding device according to the present invention will be described below with reference to the drawings.
The non-contact power feeding device according to the present invention is based on the technology described in the specification of the prior application (Japanese Patent Application No. 2013-075510 “Non-contact power feeding device”) by the applicant of the present application.

  A non-contact power feeding device according to the present invention includes a platform P set on a road surface where an electric vehicle can pass and stop, and a power transmission winding that excites induced electromotive force and attractive force in a power receiving winding portion 1 provided in the electric vehicle. Part 2, support F that enables horizontal movement of power transmission winding part 2 in the same posture under platform P, and magnetic base that magnetically induces power transmission winding part 2 in the central part under support F 3, a shield plate 4 interposed between the power transmission winding portion 2 and the magnetic base 3, and an operation frequency adjusting means for changing the operation frequency of the power transmission winding portion 2.

The platform P in the example shown in FIG. 5 and FIG. 6 is a non-magnetic material such as FRP that can stop the electric vehicle and is not magnetized during power feeding (excluding magnetic materials such as a ferromagnetic material, a paramagnetic material, or a diamagnetic material). ), A tank T for storing an insulating fluid serving as the support F under the road plate 5, and a magnetic field of the power transmission winding portion 2 at the center of the bottom wall T1 of the tank T. A guidance space S for providing a reference position O which is a guidance destination is provided.
The tank T can use the bottom wall T1 of the tank T as the shield plate 4 by using a nonmagnetic material such as aluminum having magnetic shielding properties or a magnetic material such as iron as a material. The shield plate 4 that covers substantially the entire area of the bottom wall T1 of the tank T may be separately disposed below T.

The tank T has a width that can provide a practical applicable range when correcting the positional deviation between the power receiving winding part 1 provided in the electric vehicle and the power transmission winding part 2 provided in the platform P. And the track | orbit which the said power transmission winding part 2 moves in the surface or the inside of the said insulating fluid stored there, and the said road board 5 are taken in parallel.
The induction space S employs a configuration in which the magnetic base 3 is disposed in the lower central portion in the vicinity of the bottom wall T1 (shield plate 4) of the tank T, and other portions are filled with a nonmagnetic material.
The magnetic base 3 uses a magnetic material such as ferrite or iron, and the non-magnetic material uses insulating oil (mineral oil, vegetable oil, silicon oil, etc.) or the like.

  In this example, the power receiving coil portion 1 and the power transmitting coil portion 2 are formed by winding a power receiving coil 1b and a power transmitting coil 2b around each of cores 1a, 2a made of a magnetic material such as ferrite. In other words, both the power receiving winding portion 1 of the electric vehicle and the power transmission winding portion 2 of the platform P constitute a separate transformer (see FIG. 8).

In addition, the power receiving winding portion 1 of this example constitutes a power receiving portion together with a charger 7 for supplying power to the storage battery 6, a power receiving (secondary) parallel resonant capacitor C2, a processing changeover switch SW2 for opening and closing a power receiving circuit that requires them. To do.
On the other hand, the power transmission winding unit 2 in this example includes a three-phase 200V power supply 8, an inverter power supply device 9 that adjusts the power supply 8 as a power supply for power supply, a power transmission (primary) series resonance capacitor (primary capacitor) C1, and the primary capacitor. A power transmission unit is configured together with the processing changeover switch SW1 that short-circuits C1 (see FIG. 4).

The power transmission winding portion 2 of this example is fixed to a support frame 12 made of a non-magnetic material integrated with a float 11 that floats on the insulating fluid at a certain depth and can move horizontally (see FIG. 8 or the technology described in the prior application).
The float 11 is made of, for example, an insulating nonmagnetic material such as rubber or synthetic resin, and floats the power transmission winding portion 2 on the surface or inside of the insulating fluid with its buoyancy, so that the power receiving winding A configuration and arrangement that can ensure a well-balanced and stable buoyancy at each position of the power transmission winding part 2 so that the floating posture in which the part 1 and the power transmission winding part 2 are parallel can be suitably maintained.

In this way, by suspending the power transmission winding part 2 in the insulating fluid, the positional deviation correction can be easily performed even with a relatively weak magnetic force, and with a relatively simple structure. Since this can be realized, it is possible to avoid an increase in device scale and an increase in cost due to the addition of the structure.
The insulating fluid is selected from insulating oil (mineral oil, vegetable oil, silicone oil, etc.) and the like.
The filling amount of the insulating fluid is such that the power transmission winding portion 2 is as close as possible to the back surface of the road plate 5 and the power transmission winding portion 2 is connected to the road plate 5 or the bottom wall T1 of the tank T. The amount can move freely without touching.

The support frame 12 in this example includes braking means 13 attached to the front, rear, left, and right ends of the support frame without losing balance (see the technique described in FIG. 8 or the prior application).
If the power transmission winding unit 2 is close to the power receiving winding unit 1 and the braking means 13 is provided to suppress the vibration of the power transmission winding unit 2, both winding units 1 and 2 can be contactlessly fed. It is fixed in an optimal positional relationship, and power supply efficiency can be stably maintained at a high level.

The braking means 13 includes an anchor 14 that can be lifted and lowered with respect to the support frame 12 in a straight track and a restraining member 15 that restricts the upper limit of the lifting and lowering operation of the anchor 14.
The anchor 14 and the restraining member 15 are made of a magnetic material, and the core 2a, the anchor 14 and the restraining member 15 form a series of magnetic paths (see FIG. 8).

The anchor 14 in the example includes a pressurizing portion at the lower end, and the tip of the pressurizing portion presses against the bottom wall T1 of the tank T with its own weight, thereby braking the power transmission winding portion 2, The anchor 14 is lifted by the formation of a magnetic path, and the pressure is released from the bottom wall T1 of the tank T so that the braking is released.
In this way, by adopting a configuration in which the braking means 13 is operated by the attractive force excited by the power transmission winding portion 2, a sufficient braking effect can be obtained at a low cost with a simple configuration without additionally providing an actuator. Can do.

  The operating frequency adjusting means in this example is included in a control unit including a CPU, a memory, an IO port, a vehicle body detection sensor, and an input / output interface, and is used to excite the induced electromotive force in the power receiving winding unit 1. According to the material and thickness (material) of the shield plate 4, the operating frequency of the electric power supplied to the power transmission winding unit 2 is a frequency that does not pass through the shield plate 4 (hereinafter referred to as “feeding / correction frequency”), The inverter power feeding device 9 is controlled so as to switch between frequencies that transmit both of them (hereinafter referred to as “reset frequency”).

<Position displacement correction processing>
In the positional deviation correction process of this example, the control unit stops the electric vehicle A to the platform P and the position of the power receiving winding unit 1 of the electric vehicle A with respect to the power transmission winding unit 2 is constant. It is detected that the deviation exceeds the amount, and the operation frequency adjusting means performs a process of switching the operation frequency of the power output from the inverter power supply device 9 to the power supply / correction frequency, and the process changeover switch SW1 is set. Electric power is supplied to the power transmission winding section 2 by closing and opening the switch SW2 (see FIGS. 1 and 4A).

The power transmission winding part 2 forms a magnetic path with the core 2a, the anchor 14, and the restraining member 15 by being supplied with electric power (see FIG. 8A).
When the magnetic flux generated in the power transmission winding portion 2 is sufficiently increased, the magnetic force of the magnetic path increases, and the anchor 14 is attracted to the restraining member 15 and the core 2a, respectively, and is restricted by the restraining member 15. It rises until it is done (see FIG. 8B).

At that time, the power transmission winding part floating in the insulating fluid is obtained when the magnetic flux that has passed through the path plate 5 enters from the core 2a of the power transmission winding part 2 to the core 1a of the power reception winding part 1. 2 is attracted to and moved by the power receiving winding portion 1 provided in the electric vehicle A (see FIG. 3 before and after correction of the prior art).
Since the magnetic flux of the power transmission winding part 2 due to the power feeding / correction frequency cannot be transmitted through the shield plate 4 and is cut off, the power transmission winding part 2 does not go to the magnetic base 3 but the electric vehicle A A force that moves toward the power receiving winding portion 1 is generated.

  Note that the current supplied to the power transmission coil 2b and the power receiving coil 1b in the positional deviation correction process maintains a gap between the two winding parts 2 and 1, and the power transmission coil part 2 is not large enough to raise.

<Power supply processing>
In the power supply processing of this example, the power transmission winding unit 2 and the power receiving winding unit 1 constitute the separation type transformer, and the electric power generated by the inverter power supply device 9 is transmitted through the charger 7. Supply to storage battery 6.
In the power feeding process, the control unit detects that the power transmission winding unit 2 has moved within an allowable range substantially directly below the power receiving winding unit 1, and the inverter power feeding device 9 is operated by the operating frequency adjusting unit. Is performed to switch the operation frequency of the electric power output to the power supply / correction frequency, and the process selector switch SW1 is opened and the switch SW2 is closed to start excitation of the power receiving winding unit 1 (FIG. 1). reference).

At this time, by reducing the magnetic flux generated in the power transmission winding portion 2 as compared with the positional deviation correction process, the pressurization portion cannot be maintained on the bottom wall T1 of the tank T without being able to maintain the rise of the anchor 14. It moves down by its own weight until it reaches, and the movement of the power transmission winding portion 2 is stopped at the position deviation correction processing end position immediately before the shift to the power supply processing (see FIG. 8C).
It should be noted that a method for detecting that the position of the power receiving winding portion 1 is shifted with respect to the power transmitting winding portion 2 or that the power transmitting winding portion 2 is within an allowable range substantially directly below the power receiving winding portion 1. The method for detecting the movement to the position may be appropriately selected from existing methods including the conventional method.

<Reset processing>
In the reset process of this example, the power transmission winding unit 2 is guided to the magnetic base 3 and returned to the reference position located at the center of the movable range of the power transmission winding unit 2.
The control unit detects that the power supply operation to the electric vehicle A has been completed, and performs a process of switching the operation frequency of the electric power output from the inverter power supply device 9 to the reset frequency by the operation frequency adjusting unit. Then, power is supplied to the power transmission winding unit 2 by closing the processing switch SW1 and opening the switch SW2.

  Similarly to the displacement correction process, when the magnetic flux generated in the power transmission winding portion 2 is sufficiently increased, the magnetic force of the magnetic path increases, and the anchor 14 is attached to the restraining member 15 and the core 2a, respectively. It is pulled up and rises until it is regulated by the restraining member 15 (see FIG. 8B).

  Since the magnetic flux of the power transmission winding 2 due to the reset frequency passes through the shield plate 4, the power transmission winding 2 exerts an attractive force on both the power reception winding 1 and the magnetic base 3. However, if the electric vehicle A is detached from the platform P, an attractive force acts only on the magnetic base 3, and the power transmission winding part 2 returns to the reference position without resistance. Will be.

  In the case where the electric power transmission winding unit 2 is returned to the reference position before the electric vehicle A is detached from the platform P or after the electric vehicle B to be fed next is placed on the platform P, The power transmission winding portion 2 is configured to direct the attractive force of the power transmission winding portion 2 toward the magnetic base 3 against the force attracted to the power receiving winding portion 1 of the electric vehicle A or the electric vehicle B. The distance between the power receiving winding portion 1 and the power receiving winding portion 1 is sufficiently longer than that between the power transmitting winding portion 2 and the magnetic base 3, or the magnetic base 3 has a magnetic permeability higher than that of the core 1a of the power receiving winding portion 1. What is necessary is just to adjust so that sufficient difference may arise in the magnetic force of the said power transmission winding part 2 which goes to both directions, such as using a high raw material.

  When the control unit detects the end of the return operation, the control unit stops power supply to the power transmission winding unit 2 by the inverter power supply device 9. As the power supply is interrupted and the magnetic path is almost extinguished, the braking means 13 is activated, and the power transmission winding portion 2 stops at the reference position.

FIG. 5A shows an example in which iron is used as the material of the tank T.
Since iron is a magnetic substance, a magnetic attractive force acts between the power transmission winding portion 2 and may interfere with the positional deviation correction process and the reset process.
Therefore, in this example, the thickness of the shield side wall 10 of the tank T is set sufficiently larger than the thickness of the bottom wall T1, and the operating frequency is transmitted only through the bottom wall T1 of the tank T, and the shield side wall 10 By adopting a frequency that does not transmit, a configuration is adopted in which the attractive force of the power transmission winding part 2 does not act on the shield side wall 10.

FIG. 5B shows an example in which aluminum is used as the material of the tank T.
Since aluminum is a non-magnetic material, magnetic attraction force does not work with the power transmission winding portion 2, and the power transmission winding portion 2 has attraction force for the positional deviation correction processing and the reset processing. There is little possibility that the shield side wall 10 may be hindered.
Therefore, in this example, the thickness of the shield side wall 10 of the tank T is set equal to the thickness of the bottom wall T1, and the operating frequency is transmitted only through the bottom wall T1 of the tank T, and the shield side wall 10 is transmitted through. It can be a frequency that does not.

  The penetration depth δ (m) corresponding to the material of the shield plate 4 or the shield side wall 10 is a square root of 2 / (2πfμ0σ) where conductivity σ (S / m), magnetic permeability μ0, and operating frequency f. Therefore, each frequency may be derived from 4πfμ0σδ using the conductivity σ (S / m), the magnetic permeability μ0, and the transmission depth δ (m) of the material to be used.

The positional deviation correction process for moving the power transmission winding unit 2 needs to supply a larger current I (for example, about 4 to 5 times) compared to the power supply process.
When a large current is supplied to the power transmission winding section 2 to which a resonance capacitor is connected, an excessive voltage V (V = ωLI, power transmission coil reactance L, operating frequency f) is applied to the power transmission coil 2b, and a dangerous state occurs. Become.
In order to avoid such a situation and to allow a large current I to flow safely through the power transmission winding section 2, the power supply / correction frequency can be set separately for the power supply frequency and the correction frequency. .

  Both the power feeding frequency and the correction frequency are required to be frequencies that do not pass through the shield plate 4, but the voltage V generated when the large current I is supplied at the time of the misalignment correction is not excessive. In order to achieve this, it is desirable to set the operating frequency f at the time of the positional deviation correction to be lower than the operating frequency f at the time of the power feeding process.

  For example, in the case of Example 2, when the shield side wall 10 is made of aluminum 5 mm and the shield plate 4 is made of aluminum 3 mm, the operating frequency of the power transmission winding part 2 is about 20 kHz in the power supply process, When the same current is applied in the power feeding process to the voltage generated in the power transmission winding part 2 in the positional deviation correction process by setting the positional deviation correction process to approximately 1 kHz and the reset process to approximately 500 Hz. The voltage can be reduced to 1/20 of the voltage.

FIG. 9 shows an example in which a resonance circuit is connected to the primary winding portion in a switchable manner.
Each resonance circuit is adapted to an individual operation frequency f that ensures a capability suitable for each process during the power supply treatment, the positional deviation correction process, and the reset process.
In this example, three resonance circuits that connect resonance capacitors Ca, Cb, and Cc that resonate under each operating frequency f in series to the transmission coil 2b are provided in parallel, and each resonance circuit is switched according to each process. Switches SWa, SWb, SWc as switching means to be connected are provided (see FIG. 9).

The current I (I = V / ωL, V: coil application voltage, power transmission coil reactance L, ω = 2πf) flowing through the power transmission coil 2b during each process is determined by the coil application voltage, that is, the inverter output voltage. There is an upper limit according to the capacity of the inverter, and the operating frequency f is determined in consideration of the material and thickness of the shield plate 4, so that the adjustment range is limited.
As described above, in order to obtain a large attractive force with the same inverter while the range of the output voltage of the inverter and the operating frequency f is limited, the number of turns of the power transmission coil 2b is increased and the power transmission coil reactance L is increased. It is desirable to do.
However, when the power transmission coil reactance L is increased, the impedance Z = ωL of the power transmission coil 2b increases, and there is a problem that the current I flowing through the power transmission coil 2b under the same voltage V is reduced.
Depending on the selection of the power transmission coil reactance L and the operating frequency f, there may be a case where the power feeding process, the positional deviation correction process, or the reset process is hindered.

  In this example, the power transmission coil 2b is made to resonate with an individual resonance circuit, or the circuit impedance of the power transmission coil 2b is lowered to a state closer to resonance, so that only the power transmission winding unit 2 is used in each process. A large current I that could not be flowed can be flown, and as a result, in each of the processes, a larger attractive force can be generated in the power transmission winding part 2 with a limited output voltage of the inverter. It is.

A electric vehicle, B electric vehicle,
C1 power transmission (primary) series resonance capacitor, C2 power reception (secondary) parallel resonance capacitor,
F support, P platform, S guidance space,
T tank, T1 bottom wall,
1 power receiving winding part, 1a core, 1b power receiving coil,
2 power transmission winding part, 2a core, 2b power transmission coil,
3 magnetic base,
4 Shield plate,
5 road plate, 6 storage battery, 7 charger, 8 power supply, 9 inverter power supply,
10 shield side wall,
11 float, 12 support frame,
13 Braking means, 14 anchor, 15 stop member

Claims (3)

A platform set on the road surface where electric vehicles can pass and stop,
A power transmission winding part that excites an induced electromotive force and an attractive force in a power reception winding part included in the electric vehicle;
A support that allows the power transmission winding portion to move horizontally under the platform;
A magnetic base for guiding the power transmission winding part to the center part under the support by the magnetism of the power transmission winding part;
A shield plate interposed between the power transmission winding portion and the magnetic base;
An operation frequency adjusting means for changing the operation frequency of the power transmission winding part,
The operating frequency adjusting means is
The penetration depth of magnetism excited in the power transmission winding portion when exciting the induced electromotive force and attractive force in the power receiving winding portion is set to a penetration depth lower than the thickness according to the material of the shield plate, and the power transmission winding The penetration depth of the magnetism excited by the power transmission winding portion when the wire portion is guided to the magnetic base by the magnetism of the power transmission winding portion so as to exceed the thickness according to the material of the shield plate A non-contact power feeding device that switches an operating frequency of a power transmission winding unit. A platform set on the road surface where electric vehicles can pass and stop,
A power transmission winding part that excites an induced electromotive force and an attractive force in a power reception winding part included in the electric vehicle;
A support that allows the power transmission winding portion to move horizontally under the platform;
A magnetic base for guiding the power transmission winding part to the center part under the support by the magnetism of the power transmission winding part;
A shield plate interposed between the power transmission winding portion and the magnetic base;
Operating frequency adjusting means for changing the operating frequency of the power transmission winding section;
A shield side wall that surrounds the side of the power transmission winding portion and the support,
The operating frequency adjusting means is
The penetration depth of the magnetism excited in the power transmission winding portion when exciting the induced electromotive force and attractive force in the power receiving winding portion and when guiding the power transmission winding portion to the magnetic base by the magnetism of the power transmission winding portion According to the material of the shield side wall, the operating frequency of the power transmission winding part is switched so that the penetration depth is less than its thickness. A platform set on the road surface where electric vehicles can pass and stop,
A power transmission winding part that excites an induced electromotive force and an attractive force in a power reception winding part included in the electric vehicle;
A support that allows the power transmission winding portion to move horizontally under the platform;
A magnetic base for guiding the power transmission winding part to the center part under the support by the magnetism of the power transmission winding part;
A shield plate interposed between the power transmission winding portion and the magnetic base;
Operating frequency adjusting means for changing the operating frequency of the power transmission winding section;
A shield side wall that surrounds the side of the power transmission winding portion and the support,
The operating frequency adjusting means is
The penetration depth of magnetism excited in the power transmission winding portion when exciting the induced electromotive force and attractive force in the power receiving winding portion is set to a penetration depth lower than the thickness according to the material of the shield plate, and the power transmission winding The penetration depth of the magnetism excited by the power transmission winding portion when the wire portion is guided to the magnetic base by the magnetism of the power transmission winding portion so as to exceed the thickness according to the material of the shield plate While switching the operating frequency of the power transmission winding part,
The penetration depth of the magnetism excited in the power transmission winding portion when exciting the induced electromotive force and attractive force in the power receiving winding portion and when guiding the power transmission winding portion to the magnetic base by the magnetism of the power transmission winding portion According to the material of the shield side wall, the operating frequency of the power transmission winding part is switched so that the penetration depth is less than its thickness.

Images