JP4536131B2 - Insulated power feeder for moving objects - Google Patents

Description

  The present invention relates to an apparatus for charging a battery of a self-propelled cart facility powered by a battery.

  Conventionally, a self-propelled cart (AGV) equipment powered by a battery is generally a battery using a direct power feeding method in which a collector shoe is brought into contact with a DC 12V, 24V, 36V, 48V, or 96V low voltage overhead line to collect electricity. Have been charging. However, in the direct power supply method, since a supply voltage is low, a large current flows, and the overhead wire portion and the collector portion are severely worn and maintenance is complicated. In addition, since power is supplied through an uninsulated overhead wire, leakage from the exposed charged part is unavoidable, and it is difficult to ensure safety.

On the other hand, when a power feeding device using electromagnetic induction is used, power can be supplied in a contactless manner with the power feeding device and the power receiving device insulated.
Patent Document 1 discloses a method of supplying power to a traveling carriage that travels along a fixed body such as a floor or a rail in an unmanned factory or the like. An iron core wound with a coil is provided on the moving body, the iron core wound with the coil is disposed at a position where the moving body stops, and power is supplied to the moving body by energizing the coil of the fixed body.
In the disclosed method, the moving body can be charged in a non-contact manner with the power feeding device, but it is necessary to stop the moving body at the power feeding place and supply power.

Patent Document 2 discloses a technique for supplying power in a contactless manner while a moving body is moving. According to the disclosed technology, the feeding section and the non-feeding section are alternately set along the path of the moving body, the primary side coil including the feeding control means is laid in the feeding section, and the secondary coil is provided in the moving body. Thus, it is possible to supply electric current to the moving body in a non-contact manner by electromagnetic induction by passing a current through the primary coil only while the moving body is traveling in the power feeding section.
In the disclosed technology, since the primary coil is energized while the moving body is present in the power feeding section, when the moving body is smaller than the power feeding section, a large loss occurs due to the leakage magnetic flux. In addition, there may be adverse effects such as overheating by generating eddy currents in the surrounding conductors.

Patent Document 3 discloses a linear motor-driven transfer device. Here, in a transfer device in which a linear motor secondary conductor is provided on the moving body and the linear motor main body is disposed on the travel path side, an induction coil facing the linear motor main body is attached to the moving body, A battery that charges the battery by rectifying the three-phase AC voltage induced in the induction coil when it stops at the loading / unloading position or during traveling to meet the power demand in the mobile body other than driving power is disclosed. Yes.
In the linear motor driven conveying device, the primary coil of the driving linear motor is formed so that the three-phase induction coil Y-connected to the comb-shaped core arranged in the running direction partially overlaps and shifts one phase at a time. ing. In the disclosed invention, the battery for the control circuit is charged by diverting the primary coil as it is. Since the primary side coil has a capacity for driving the moving body, it is sufficient to use a part of the primary side coil as a control power source.

Patent Document 4 discloses a device that supplies power for power to a guided vehicle traveling on a fixed track in a non-contact manner. A non-contact power feeding device of the disclosed invention includes a primary coil that is arranged along a track and can be connected / disconnected by a switch, and a secondary coil provided on a moving body, and the primary coil facing the secondary coil is connected to an AC power source. To induce a current in the secondary coil.
The opposing surface of the downward U-shaped secondary iron core provided on the moving body side is sized to cover two adjacent primary iron cores on the track side.
According to the disclosed apparatus, it is possible to efficiently supply power without mechanical contact.
However, since the area where the primary iron core and the secondary iron core face each other changes while the moving body moves along the track, the magnitude of the excitation current changes during the movement.
JP-A-3-289302 Japanese Patent Laid-Open No. 7-0667206 JP-A-3-007002 Japanese Utility Model Publication No. 6-066201

  The problem to be solved by the present invention is to provide a small and lightweight non-contact power feeding device that can feed power to the moving body while the moving body is moving. In particular, it is an object of the present invention to provide a non-contact power feeding device that performs battery charging of a self-propelled carriage powered by a battery while maintaining an electrically insulated state.

In order to solve the above-described problem, the non-contact power feeding device of the present invention uses a magnetic induction to charge a battery of a moving body from a primary coil on the ground via a secondary coil facing the primary coil. The primary coil is a three salient pole type magnetic body with a three-phase winding on the magnetic pole of an E-shaped cross section, and the three magnetic poles are arranged in a direction perpendicular to the moving locus of the moving body. A plurality of these are arranged at the same pitch along the movement locus for each phase.
Furthermore, the secondary side coil mounted on the moving body is also a three-phase winding on the magnetic pole of the same three salient pole type magnetic body as the primary side coil, and the length of the moving direction of the magnetic pole in the moving body is the primary side coil. It is equal to the movement direction pitch of the magnetic pole.

  In addition, the primary coil is connected to a three-phase AC power source via a switch, and includes an overlap sensor that detects the overlapping state of the magnetic pole of the primary coil and the magnetic pole of the secondary coil. When it is detected, the switch is turned on to energize the primary coil, and when it is detected that both magnetic poles are separated, the switch is opened and the connection with the power source of the primary coil is cut off.

According to the present invention, since the primary side coils are arranged along the movement trajectory of the moving body, while the secondary side coil of the moving body moves along the row of the primary side coils, it is contactless by electromagnetic induction. Energy can be transferred in a non-contact manner by inducing a current in the secondary coil.
The non-contact power feeding device of the present invention, in order to use the magnetic circuit of a three-phase alternating current, the output capacity ratio obtained by dividing the output power KVA with iron core volume m ³ is increased.

Also, since the length of the magnetic pole of the secondary side coil is equal to the pitch of the primary side coil, the magnetic flux interlinking with the secondary side coil does not change even when the secondary side coil is moving, and the secondary side even during movement The power supply to the coil is not interrupted, and the output fluctuation of the secondary coil can be suppressed.
Further, since the primary side coil is energized only when the secondary side coil is located at a position facing the magnetic pole, the generation of leakage magnetic flux that radiates into the space without the opposing coil is suppressed, and an efficient operation is possible.

In the present invention, the primary side coil and the secondary side coil are preferably magnetically shielded on the side surfaces parallel to the moving direction. These coils are preferably sealed by applying a resin cover to the surface.
When the moving direction of the moving body is the horizontal direction, by providing magnetic shields on the upper and lower surfaces of the primary side coil and the secondary side coil, the leakage magnetic flux to the surroundings can be cut off to ensure safety.
In addition, the coil surface sealed with a resin cover is not adversely affected even when it is splashed with water, for example, when the battery is charged at the water's edge.

The switch is preferably configured by connecting an electromagnetic switch and a resistor in parallel.
Even if a semiconductor switch such as a GTO is used, a type that requires a cut-off signal with a frequency corresponding to the current to be cut off follows if the frequency of the input power source of the primary coil to be cut off is as high as about 400 Hz. I can't. For this reason, a mechanical electromagnetic switch is used to open and close the electric circuit regardless of the frequency of the power supply current.

However, since this switch interrupts a large current supplied to the primary side coil, there is a problem that the life of the electromagnetic switch is shortened due to a spark flying between the electrodes particularly when the current is interrupted.
Therefore, by connecting a resistor in parallel to the electromagnetic switch, when the electromagnetic switch is released, a surge current is passed through the parallel resistor to prevent sparking between the contacts and extend the life of the electronic switch. it can.

Furthermore, the three-phase AC power source is an inverter provided with a rectifier circuit connected to an external three-phase AC supply line, a smoothing circuit for smoothing the DC output of the rectifier circuit, and an inverse conversion circuit for converting the output of the smoothing circuit to AC. Preferably there is.
Higher AC current flowing through the primary coil is less likely to cause magnetic saturation, and the cross-sectional area of the core iron core can be reduced, which is suitable for reducing the size and weight of the device. Therefore, it is desirable to increase the efficiency by using 50 Hz or 60 Hz alternating current as high as possible, such as 400 Hz, using an inverter.

In addition, it is preferable to include a control device that takes in a measured value of the DC output power of the rectifier circuit of the inverter and determines that the battery charging is finished when the fetched DC output power measured value is smaller than a predetermined value.
When the inverter output charges the battery of the moving body via the primary side coil, a current corresponding to the charging current flows through the inverter. On the other hand, when the battery charging is completed and the charging current disappears, only a minimum current flows through the inverter.

Therefore, as a result of intensive studies, the inventors of the present invention have observed that the change in the charging current is most easily observed in the DC output of the rectifier circuit. It was found that the DC output power calculated from the voltage and the DC current can be easily determined because it has the same value as when there is no load.
In the power supply device of the present invention, when the completion of battery charging is detected based on the DC output power calculated from the rectifier circuit output voltage and current of the inverter, the power supply to the primary coil is shut off by the electromagnetic switch, Deterioration and wear caused by overcharging of the battery can be prevented.

It should be noted that, by arranging a predetermined number of primary side coils of the present invention as a unit and arranging them in an appropriate number along the movement trajectory of the moving body as necessary, a shortage of capacity is supplemented or a plurality of movements are made. You can charge your body at the same time.
Such unitization simplifies the design, manufacturing, and construction processes, and makes the product cost effective.

ADVANTAGE OF THE INVENTION According to this invention, the efficient non-contact electric power feeder which can supply electric power to a moving body while a moving body is moving can be provided.
Furthermore, it is possible to provide a non-contact power feeding device that charges a battery of a self-propelled cart powered by a battery while maintaining an electrically insulated state.

Hereinafter, the best mode of the non-contact power feeding device of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view for explaining the concept of the main part of the contactless power feeding device of this embodiment, FIG. 2 is a plan view, FIG. 3 is a side sectional view, and FIG. 4 is a secondary coil during charging traveling in this embodiment. FIG. 5 is a block diagram showing a system in which a plurality of power supply units each including a plurality of power supply devices are arranged, and FIG. 6 is a block diagram showing a circuit configuration of the power supply unit.

The basic configuration of the non-contact power feeding apparatus of this embodiment is shown in FIGS.
The non-contact power feeding device of this embodiment is a device that charges a battery of a battery-driven self-propelled cart while traveling at a charging station, and is opposed to the primary coil 1 on the power feeding side by using electromagnetic induction. Energy is transmitted to the secondary coil 2 on the self-propelled carriage side to charge the battery.
In the non-contact power feeding apparatus of this embodiment, three-phase alternating current one-phase windings 13 and 23 are wound around three magnetic poles 11 and 21 whose backs are connected by yokes 12 and 22, respectively. Use the coil. Thus, the output volume ratio as compared to the single-phase windings (divided by the output power KVA iron core volume m ³⁾ is the high efficient apparatus.

The primary coil 1 on the power supply side is fixed to the ground, and a plurality of magnetic poles U, V, W arranged in a direction perpendicular to the movement locus of the self-propelled carriage are arranged at the same pitch P along the movement locus. The power supply unit 10 is formed by arranging, for example, six.
The secondary coil 2 mounted on the self-propelled carriage is provided with three magnetic poles u, v, and w arranged at positions corresponding to the respective phases of the primary coil 1 on the power feeding side. The length D2 in the moving direction of the carriage is equal to the moving direction pitch P of the magnetic pole 11 of the primary coil.

During the movement of the self-propelled carriage, the magnetic poles U, V, W of the primary coil 1 and the magnetic poles u, v, w of the same phase of the secondary coil 2 need to correspond to each other. Each is configured to have the same height.
In front of the power feeding device, a guide rail for a self-propelled carriage and a guide guard are provided, and several millimeters are provided between the primary side magnetic poles U, V, W and the secondary side magnetic poles u, v, w while the self-propelled carriage is running. Therefore, the gap G of 10 mm or more is maintained so that energy can be transferred stably.

The secondary coil 2 has a built-in unit 26 including a battery charging rectifier circuit incorporating a stabilization circuit that keeps current and voltage within a certain range.
The primary side coil 1 and the secondary side coil 2 arrange | position the magnetic shields 14 and 24 in the upper surface and a lower surface, and interrupt | block the leakage magnetic flux to circumference | surroundings.
In addition, the entire periphery including the front surfaces of the magnetic poles 11 and 21 is covered with resin 15 and 25 for waterproofing and soundproofing.

Since the length D2 of the magnetic pole 21 of the secondary coil 2 is equal to the moving direction pitch P of the magnetic pole 11 of the primary coil 1, the interlinkage magnetic flux of the secondary coil 2 passes through the power supply unit 10 as shown in FIG. Maintain a stable amount while running.
That is, when the secondary coil 2 enters the power supply unit 10 and starts to link to the magnetic pole 11 of the first primary coil (1) (X = 0), the secondary flux linkage is 0%. When the magnetic pole 21 of the secondary coil advances to a position (X = D1) that completely covers the magnetic pole 11 of the first primary coil (1), it becomes 100%. Here, X represents the coordinates of the center position of the secondary coil 2. Moreover, the moving direction length of the magnetic pole 11 of the primary side coil 1 is set to D1.

Thereafter, the secondary side coil 2 continues to move until the rear end of the magnetic pole 21 moves forward from the rear end of the magnetic pole 11 of the first primary coil (1). The amount of magnetic flux remains unchanged at 100%.
When the rear end of the magnetic pole 21 is about to be separated from the rear end of the magnetic pole 11 of the first primary coil (1), the tip of the magnetic pole 21 reaches the rear end of the magnetic pole 11 of the second primary coil (2), Thereafter, the amount of flux linkage with the second primary coil (2) increases as the amount of flux linkage with the first primary coil (1) decreases as the secondary coil 2 moves. The amount of magnetic flux linked to the magnetic pole 21 of the secondary coil 2 does not change.

In this manner, the flux linkage is maintained at 100% until the rear end of the magnetic pole 21 of the secondary coil 2 starts to shift forward from the rear end of the magnetic pole of the last primary coil (n).
When the self-propelled carriage moves further and the overlap of the magnetic pole 21 of the secondary coil 2 with the magnetic pole 11 of the last primary coil (n) starts to decrease, the interlinkage magnetic flux of the secondary coil 2 over the distance D1. Is reduced to 0% at a position where the magnetic pole 21 deviates from the magnetic pole 11 of the primary coil 1 (X = L + D2), and the secondary output stops.

Here, L represents the ground pole length which is the distance between the magnetic pole ends of the power supply unit 10. The ground pole length L of the power supply unit 10 composed of n magnetic poles 11 can be expressed as L = D1 × n + d × (n−1) using the gap d between the magnetic poles.
Further, since D2 = D1 + d, the effective pole length L2 of the power feeding unit 10 in which the interlinkage magnetic flux of the magnetic pole 21 of the secondary coil 2 is 100% is
L2 = L + D2-2 × D1 = D1 × (n−1) + d × n
It becomes.

The non-contact power supply device of the present embodiment can arbitrarily set the configuration of the primary side magnetic pole in accordance with the power supply time required for charging the battery, and becomes a power supply system with a high degree of design freedom.
For example, if the number of magnetic poles n of the primary coil is 6, the magnetic pole length D1 is 220 mm, and the magnetic pole pitch P is 340 mm, the effective pole length L2 is 1820 mm, and the moving speed of the self-propelled carriage during power feeding is 0.5 m / Assuming s, the power supply time is 3.6 seconds. If charging is not completed within this time, a required number of power supply units 10 may be installed along the track of the self-propelled carriage to ensure charging time. Further, the charging time can be adjusted by increasing or decreasing the number of primary side coils constituting the power supply unit 10 or adjusting the moving speed of the self-propelled carriage.

FIG. 5 is a block diagram illustrating a configuration example of the entire system.
The battery self-propelled carriage 20 traveling in the traveling area returns to the charging station 30 at an appropriate timing and charges the mounted battery 41. For example, four power supply units 10 are arranged in the charging station 30 and a guide rail is provided in front of the power supply units 10.
While the battery self-propelled carriage 20 is guided by the guide rail and moves in front of the power supply unit 10 at a predetermined speed, the gap between the magnetic pole of the primary side coil of the power supply unit 10 and the magnetic pole of the secondary side coil 2 of the self-propelled carriage 20. Is held at an appropriate value such as 7 mm ± 3 mm, for example, so that energy can be reliably transmitted.

The power supply units 10 are each supplied with a maximum power of 400 V / 400 Hz via the primary power supply 31. The primary power supply device 31 includes an inverter 32, a switch circuit 33, and a current suppression resistor 34, converts a three-phase 400 V (50 Hz / 60 Hz) power source to a maximum of 400 V / 400 Hz by the inverter 32, and passes through the switch circuit 33. And supplied to the magnetic poles of the primary power supply unit 10.
In the present embodiment, the battery traveling carriage 20 travels by a battery 41 of 48V (12V × 4 series).

FIG. 6 is a block diagram illustrating a circuit configuration for each power supply unit 10. In one power supply unit 10, appropriate n primary side coils 1 such as six are arranged in a row.
The primary power supply device 31 includes an inverter 32, a reactive power suppression circuit 35, and a power supply control device 39, and one set of equipment is provided for the power supply unit 10.

The inverter 32 includes a rectifier circuit 36, a smoothing circuit 37, and an inverse conversion circuit 38. The inverter 32 receives a 400 V 50 Hz / 60 Hz three-phase AC power supply, rectifies the rectifier circuit 36, and converts the DC voltage to the parallel smoothing circuit 37. Then, it is converted into a three-phase alternating current of 400 Hz by the inverse conversion circuit 38 and supplied to the reactive power suppression circuit 35.
The energy exchange between the coils is more efficient and smaller in size as the frequency is higher, but assuming that it can be used relatively easily with a commercially available general-purpose inverter, the current situation is that about 400 Hz when trying to satisfy the conditions of this embodiment. Is appropriate. Therefore, it goes without saying that it may be converted to a higher frequency as the technology becomes more advanced.

The reactive power suppression circuit 35 is a circuit that switches between enabling / disabling of a resistor inserted to suppress a current flowing in each primary coil constituting the ground unit by operating an electromagnetic switch.
The reactive power suppression circuit 35 includes a switch circuit 33 provided for each of the n primary side coils 1 and a current suppression resistor 34 connected in parallel with the switch circuit 33, and is the maximum output from one inverter 32. A three-phase 400 V / 400 Hz power supply is distributed to the necessary primary coil 1.

The primary coil 1 is provided with a magnetic pole detection sensor 40 to detect that the magnetic pole of the secondary coil 2 of the self-propelled carriage 20 is entangled with the magnetic pole of the primary coil 1.
A detection signal indicating the result of detecting whether or not the magnetic pole of each primary coil 1 is entangled with the magnetic pole of the secondary coil 2 is transmitted to the power supply control device 39.
The power supply control device 39 is configured using a PLC (programmable logic controller), a board computer, or the like, and operates the inverter 32 and the reactive power suppression circuit 35. The power supply control device 39 is driven by a 100 V single-phase alternating current.

Based on the output signal of the magnetic pole detection sensor 40, the power supply control device 39 supplies power to the entangled primary side coil when the magnetic pole of the primary side coil 1 and the magnetic pole of the secondary side coil 2 are in an entangled state. The switch circuit 33 is turned on to supply current and supply power to the secondary coil 2.
Further, when the magnetic poles are not entangled, the switch circuit 33 is turned off so as not to supply useless power to the primary coil that is not charged, and the current suppression resistor connected in parallel between the terminals of the switch circuit 33 The voltage between the terminals of the switch circuit 33 is suppressed by passing a current through the capacitor 34 so as not to generate a surge, thereby ensuring the life of the switch circuit.

The power feeding control device 39 monitors the voltage and current of the DC circuit of the inverter 32 and calculates the output power. When the power charged in the battery on the secondary side becomes a certain value or less, the charging is completed and the secondary side magnetic pole is Even within the power supply range, the output of the inverter 32 is stopped.
More specifically, a DC voltage signal at a position where the output of the rectifier circuit 36 of the inverter 32 is converted to DC by the smoothing circuit 37 and a DC current signal flowing therethrough are input, and the DC power calculated from both is a predetermined value. When the value is exceeded, it is determined that the charging of the battery 41 of the self-propelled carriage 20 is completed, and the operation of the inverter 32 is stopped.

  As a result of the studies by the inventors, it has been found that the change in the effective current of the inverter 32 appears significantly in the power value when the output of the rectifier circuit 36 is smoothed. This is because, when the charging of the battery 41 is completed, energy transfer is not performed between the magnetic poles of the primary side coil 1 and the secondary side coil 2, and only the reactive current flows through the primary side coil 1. This is probably because the effective current decreases.

Therefore, in this embodiment, instead of acquiring the information signal directly from the self-propelled carriage 20 by using this knowledge, the charging end of the battery 41 is estimated by the voltage signal acquired from the inverter 32, and the inverter 32 The operation was stopped to prevent the battery from being overcharged and the inverter wasted.
According to the battery charging end determination method in the present embodiment, the state of the battery 41 on the self-propelled carriage 20 is changed by only exchanging signals inside the primary power supply 31 fixed on the ground without exchanging information with the moving self-propelled carriage 20. It is possible to perform a reasonable operation of the inverter 32 by estimation.

  The mounting unit 26 mounted on the self-propelled carriage 20 includes a secondary coil 2 having a three-phase magnetic pole 42, a rectifier constituted by a rectifier circuit 43, a chopper circuit 44, and a DC reactor 45, and a current-voltage limiting circuit 46. And a battery 41. The current induced in the secondary coil 2 wound around the three-phase magnetic pole 42 is converted into a direct current by the rectifier circuit 43, adjusted to a voltage at which an appropriate charging current can be obtained by the chopper circuit 44, and converted into a direct current by the direct current reactor 45. Smoothed and supplied to the battery 41.

The current / voltage limiting circuit 46 controls the chopper circuit 44 so that the supply voltage and the supply current become predetermined set values, and performs constant current charging at the beginning of charging and constant voltage charging at the end of charging. The battery 41 is protected.
The current / voltage limiting circuit 46 may also have a function of forcibly shutting off the secondary side system by determining the charging completion state of the battery 41.

  The non-contact power feeding device of the present invention can be used for charging vehicles such as self-propelled carts and amusement parks used in factories. Further, the non-contact power feeding device of this embodiment having a waterproof function can be used for charging a battery such as a battery-driven boat that travels on the water.

It is a perspective view explaining the concept of the principal part of the non-contact electric power feeder which concerns on one Example of this invention. It is a top view which shows the principal part of the non-contact electric power feeder which concerns on a present Example. It is side surface sectional drawing which shows the principal part of the non-contact electric power feeder which concerns on a present Example. It is drawing explaining the secondary side coil linkage magnetic flux in charge driving | running | working in a present Example. It is a block diagram showing the system which arranged and comprised two or more electric power feeding units provided with two or more electric power feeders in a present Example. It is a block diagram which shows the circuit structure of the electric power feeding unit in a present Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Primary side coil 2 Secondary side coil 10 Electric power feeding unit 20 Battery self-propelled carriage 11, 21 Magnetic pole 12, 22 Yoke 13, 23 Winding 14, 24 Magnetic shield 15, 25 Resin 26 Mounting unit 30 Charging station 31 Primary power supply 32 Inverter 33 Switch circuit 34 Current suppression resistor 35 Reactive power suppression circuit 36 Rectifier circuit 37 Smoothing circuit 38 Reverse conversion circuit 39 Power supply control device 41 Battery 42 Three-phase magnetic pole 43 Rectifier circuit 44 Chopper circuit 45 DC reactor 46 Current voltage limit circuit

Claims (6)

  A power supply device that charges a battery of a moving body from a primary coil on the ground via a secondary coil facing the primary coil using electromagnetic induction, wherein the primary coil has an E-shaped cross section 3 A magnetic pole of a salient pole type magnetic body provided with a three-phase winding, and the magnetic poles of the three salient poles arranged perpendicularly to the movement locus of the moving body are arranged at an equal pitch along the movement locus for each phase. In addition, a plurality of secondary coils mounted on the movable body are arranged at appropriate intervals, and the secondary coil mounted on the movable body is provided with a three-phase winding on the magnetic pole of a three salient pole type magnetic body similar to the primary coil, and the movable body moves by moving the magnetic pole. The length of the direction is equal to the moving direction pitch of the magnetic pole of the primary side coil, and the primary side coil is connected to a three-phase AC power source through a switch, the magnetic pole of the primary side coil and the magnetic pole of the secondary side coil An overlap sensor for detecting an overlap state; When the sensor detects the overlapping of both magnetic poles, the switch is turned on to energize the primary coil, and when it is detected that both magnetic poles are separated, the switch is opened and the connection to the power source of the primary coil is cut off. A non-contact power feeding device.   The non-contact power feeding apparatus according to claim 1, wherein the primary side coil and the secondary side coil are provided with magnetic shields on side surfaces parallel to the moving direction.   The contactless power feeding device according to claim 1 or 2, wherein the primary side coil and the secondary side coil are sealed with a resin cover on the entire surface.   The contactless power supply device according to any one of claims 1 to 3, wherein the switch includes an electromagnetic switch and a resistor connected in parallel.   The three-phase AC power source includes an rectifier circuit connected to an external three-phase AC supply line, a smoothing circuit that smoothes the DC output of the rectifier circuit, and an inverter circuit that converts the output of the smoothing circuit into an AC. The non-contact power feeding device according to claim 1, wherein   6. The non-contact power feeding apparatus according to claim 5, further comprising a control device that takes in the DC output of the rectifier circuit and determines that the battery charging is finished when the DC output is greater than a predetermined value.

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