Non-contact power supply system and delivery system

Abstract

In the contactless power supply system (110), each of the multiple contactless power supply devices (1A, 1B, 1C, 1D, 1E) is provided with an area for supplying AC power, and multiple power supply lines (12A, 12B) are respectively provided in the corresponding areas. The contactless power supply system (110) is provided with an electrostatic coupling unit (112) for electrostatically coupling one contactless power supply device to other contactless power supply devices.

Description

Technical Field

[0001] One aspect of this invention relates to a contactless power supply system and a delivery system. Background Technology

[0002] As a conventional contactless power supply system, for example, the system described in Patent Document 1 is known. The contactless power supply system described in Patent Document 1 is a contactless power supply device, comprising: multiple primary conductive circuits laid sequentially along the movement path of a vehicle; and multiple power supply devices connected to each primary conductive circuit to supply alternating current, extracting power from the magnetic field generated by the primary conductive circuits and supplying power to the vehicle, and having coupling units (power transmission cores) between adjacent primary conductive circuits for electromagnetic coupling of these primary conductive circuits.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2007-50799 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] In contactless power supply systems, the following configuration is employed: when the power supply from one power source to a primary conductor is insufficient (stopped), power is supplied from other power sources to a primary conductor (other systems). To achieve this configuration, conventional contactless power supply systems employ electromagnetic coupling between adjacent primary conductors. In this configuration, to prevent the cancellation of magnetic fields in the coupling unit, the current phase of the AC power supplied from each power source to the primary conductor needs to be approximately synchronized. Therefore, in conventional contactless power supply systems, control becomes complex.

[0008] One aspect of the present invention is to provide a contactless power supply system and a transmission system that can supply power from a contactless power supply device to the power supply line of other systems through a simple configuration.

[0009] Methods for solving problems

[0010] One aspect of the non-contact power supply system of the present invention includes: a plurality of power supply lines arranged along the track of a vehicle; and a plurality of non-contact power supply devices that supply AC power to the plurality of power supply lines respectively. The non-contact power supply system supplies power to the vehicle traveling on the track in a non-contact manner. Each of the plurality of non-contact power supply devices is provided with an area for supplying AC power, and the plurality of power supply lines are respectively arranged in the corresponding areas. The non-contact power supply system includes an electrostatic coupling unit that electrostatically couples one non-contact power supply device with other non-contact power supply devices.

[0011] One aspect of the contactless power supply system of the present invention includes an electrostatic coupling unit that electrostatically couples one contactless power supply device to other contactless power supply devices. Thus, in the contactless power supply system, for example, even when it is impossible to supply AC power from one contactless power supply device to a power supply line, AC power can be supplied from other contactless power supply devices to a power supply line. In this way, in the contactless power supply system, by using the electrostatic coupling unit that electrostatically couples one contactless power supply device to other contactless power supply devices, AC power can be supplied to power lines outside the controlled area. Therefore, in the contactless power supply system, by employing electrostatic coupling, there is no need for control to synchronize the current phase of the AC power supplied from each contactless power supply device to the power supply line. Therefore, in the contactless power supply system, power can be supplied from contactless power supply devices to power lines of other systems with a simple configuration.

[0012] In one implementation, the alternating currents flowing through multiple power supply lines may be out of phase with each other. In this configuration, it is not necessary to synchronize the phases of the alternating currents, and therefore, control for synchronizing the current phases is unnecessary. Thus, control complexity can be avoided.

[0013] In one embodiment, the device may include a frame housing multiple contactless power supply devices, with the electrostatic coupling unit housed within the frame. In this configuration, space-saving is achieved because the multiple contactless power supply devices are electrostatically coupled within the frame.

[0014] In one embodiment, a switching unit may be included to switch between the coupling and decoupling states of electrostatic coupling between one contactless power supply device and other contactless power supply devices. In this configuration, the coupling and decoupling states of electrostatic coupling between one contactless power supply device and other contactless power supply devices can be switched arbitrarily.

[0015] In one embodiment, multiple contactless power supply devices may each have a filter circuit. This filter circuit is positioned between the inverter, which converts the power supplied by the power source into AC power, and the power supply line. It includes a reactor and a capacitor. Viewed from the vehicle side receiving the AC power supply, the impedance of the electrostatic coupling section is equal to the impedance of the filter circuit. In this configuration, the impedance of the electrostatic coupling section can resonate with the impedance of the power supply line. Therefore, the efficiency of AC current transmission can be improved.

[0016] One aspect of the delivery system of the present invention includes: the aforementioned contactless power supply system; and a vehicle that receives power supplied from the contactless power supply system and travels.

[0017] One aspect of the conveying system of the present invention includes the aforementioned contactless power supply system. Therefore, in the conveying system, power can be supplied from the contactless power supply device to the power supply lines of other systems with a simple configuration.

[0018] Invention Effects

[0019] According to one aspect of the invention, it is possible to supply power from a contactless power supply device to the power supply line of other systems through a simple configuration. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the track of a conveying system in one embodiment.

[0021] Figure 2 It is a diagram showing the structure of the conveying system.

[0022] Figure 3 This is a diagram showing the configuration of a contactless power supply device.

[0023] Figure 4 This is a diagram showing the structure of a contactless power supply system.

[0024] Figure 5 This is a diagram showing the structure of an elevated transport vehicle.

[0025] Figure 6 This is a diagram illustrating the configuration of a contactless power supply system in other embodiments. Detailed Implementation

[0026] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Furthermore, in the description of the drawings, the same or equivalent elements are labeled with the same symbols, and repeated descriptions are omitted.

[0027] like Figure 1 As shown, the conveying system 100 is a system for conveying items using an overhead conveyor vehicle (traveling vehicle) 120 capable of moving along a track T. The track T is the component that enables the overhead conveyor vehicle 120 to travel, suspended from the ceiling. In this embodiment, the track T is divided into multiple sections (in...) Figure 1 In this example, there are 5 systems (sections). Track T includes the travel routes within the sections, i.e., internal sections (areas) BR1, and the travel routes connecting the different sections, i.e., interconnecting sections (areas) BR2. Internal section BR1 is configured for one-way traffic with the elevated transport vehicle 120 turning right. Interconnecting section BR2 is also configured similarly to internal section BR1, with the elevated transport vehicle 120 turning right and traveling in one direction.

[0028] The conveying system 100 includes a contactless power supply system 110 and an elevated conveyor 120. In the conveying system 100, power is supplied to the elevated conveyor 120 in a contactless manner from power supply lines 12A and 12B connected to the track T. The elevated conveyor 120 is driven by the supplied power to move or to drive various devices installed on the elevated conveyor 120.

[0029] The overhead conveyor 120 includes, for example, a canopy-suspended crane and an OHT (Overhead Hoist Transfer). The items include, for example, containers holding multiple semiconductor wafers, containers holding glass substrates, intermediate mask boxes, and general components.

[0030] like Figure 2 As shown, track T is, for example, a circular track. Power supply lines 12A and 12B are supplied with power from non-contact power supply devices 1A, 1B, 1C, 1D, and 1E. Power supply lines 12A and 12B are positioned below track T in the direction of travel of the overhead conveyor 120, and are at least one on the right and left sides relative to the center of the track. Furthermore, power supply line 12B is positioned below power supply line 12A, therefore, in Figure 2 It becomes overlapping with the lower part of the power supply line 12A.

[0031] The power supply lines 12A and 12B change their configuration relative to the track T via the switching unit 30. In the initial region where they connect to the non-contact power supply devices 1A, 1B, 1C, 1D, and 1E, the power supply lines 12A and 12B are positioned on the left side of the track T. When the vehicle travels on the track T in the direction of travel of the overhead conveyor 120, the power supply lines 12A and 12B are switched from the left side to the right side of the track T via the switching unit 30.

[0032] The contactless power supply system 110 includes contactless power supply devices 1A, 1B, 1C, 1D, and 1E. These devices supply power to the overhead conveyor vehicle 120 in a contactless manner. The contactless power supply devices 1A, 1B, 1C, 1D, and 1E are respectively provided with respect to the internal section BR1 and the interconnecting section BR2. In this embodiment, contactless power supply devices 1A, 1B, 1C, and 1D supply power to each internal section BR1. Contactless power supply device 1E supplies power to the interconnecting section BR2. In this embodiment, the contactless power supply devices 1A, 1B, 1C, 1D, and 1E are housed within a frame 111.

[0033] like Figure 3As shown, the contactless power supply devices 1A, 1B, 1C, 1D, and 1E include a power supply 2, a wiring circuit breaker 3, a noise filter 4, a power factor improvement device 5, a rectifier 6, a smoother 7, an inverter 8, a filter circuit 9, a first current sensor 10, a second current sensor 11, power supply lines 12A and 12B, and a control device 13. The noise filter 4, the power factor improvement device 5, the rectifier 6, and the smoother 7 constitute a power converter 16.

[0034] Power supply 2 is a device that supplies AC power (three-phase 200V) to commercial power sources, etc. The frequency of the AC power is, for example, 50Hz or 60Hz. Circuit breaker 3 disconnects the circuit when an overcurrent flows. Noise filter 4 removes noise from the AC power. Noise filter 4 is, for example, composed of a capacitor. Power factor improvement device 5 improves the power factor by bringing the input current closer to a sine wave. Power factor improvement device 5 is, for example, composed of a reactor.

[0035] The rectifier 6 converts the AC power supplied from the power source 2 (power factor improvement device 5) into DC power. The rectifier 6 is constructed, for example, by a rectifying element such as a diode. The rectifier 6 may also be constructed by a switching element such as a transistor. The smoother 7 smooths the DC power converted in the rectifier 6. The smoother 7 is constructed, for example, by an electrolytic capacitor. The voltage converter may also have a step-up / step-down function.

[0036] Inverter 8 converts the DC power output from smoother 7 into AC power and outputs it to filter circuit 9. Inverter 8 changes the switching frequency based on a control signal output from control device 13, thereby changing the magnitude of the AC power output to filter circuit 9. Inverter 8 has multiple switching elements 14. Switching elements 14 are elements capable of switching electrical connections. Examples of switching elements 14 include MOSFETs (Metal Oxide Semiconductor Field Effect Transistors), IGBTs (Insulated Gate Bipolar Transistors), and bipolar transistors.

[0037] The filter circuit 9 is located between the inverter 8 and the power supply lines 12A and 12B. The filter circuit 9 suppresses high-order harmonic noise. The filter circuit 9 includes a reactor RT1, capacitors C0 and C1, a reactor RT2, and a capacitor C2.

[0038] Reactor RT1 and capacitor C0 are connected in series to form the first resonant circuit RC1. Reactor RT2 and capacitor C2 are connected in series to form the second resonant circuit RC2. The first resonant circuit RC1 and the second resonant circuit RC2 are connected in series.

[0039] Reactor RT2 is a variable reactor whose value can be changed (adjusted). Capacitor C2 is a variable capacitor whose capacitance value can be changed. The reactor value (parameter) of reactor RT2 and the capacitance value (parameter) of capacitor C2 are set (adjusted) by the operator, for example, when setting up the equipment of conveyor system 100. Capacitor C1 is connected in parallel with respect to the first resonant circuit RC1 and the second resonant circuit RC2.

[0040] The first current sensor 10 detects the current I1 (inverter current) output from the inverter 8, i.e., the current flowing through the inverter 8. The first current sensor 10 outputs a first current signal representing the detected current I1 to the control device 13. The second current sensor 11 detects the current I2 (supply current) of the AC power flowing through the second resonant circuit RC2. The second current sensor 11 outputs a second current signal representing the detected current I2 to the control device 13.

[0041] Power supply lines 12A and 12B constitute coils for non-contactly supplying power to the power receiving unit 121 of the overhead conveyor 120. Power supply lines 12A and 12B are, for example, stranded wires, comprising multiple bundles of copper wires twisted together, the outer periphery of which is covered, for example, by a tube made of an insulator, thus forming power supply lines 12A and 12B. Power supply lines 12A and 12B receive alternating current from the filter circuit 9, thereby generating magnetic flux. Power supply lines 12A and 12B have inductance RL. In this embodiment, the alternating currents flowing through the multiple power supply lines 12A and 12B are out of phase with each other.

[0042] The control device 13 controls the operation of the inverter 8. The control device 13 is a computer system or processor installed in an integrated circuit. The control device 13 consists of a CPU (Central Processing Unit), ROM (Read Only Memory), RAM (Random Access Memory), and input / output interfaces. Various programs and data are stored in the ROM.

[0043] The control device 13 has a control unit 15. The control device 13 is connected to the first current sensor 10 and the second current sensor 11 of the filter circuit 9. The control device 13 receives the first current signal and the second current signal output from the first current sensor 10 and the second current sensor 11, respectively.

[0044] The control unit 15 controls the inverter 8, thereby controlling the magnitude of the AC power supplied to power lines 12A and 12B, and the magnitude of the power supplied to the overhead conveyor 120. In this embodiment, phase-shift control is used for power control. In phase-shift control, the power control parameters used to control the magnitude of the AC power are changed. The control unit 15 performs phase-shift control to change the magnitude (frequency) of the AC power by changing the on-time of the inverter 8. The control unit 15 uses drive signals to the plurality of switching elements 14 of the inverter 8 to adjust the switching frequency of each switching element 14 and change the on-time of each switching element 14. The power control parameters in phase-shift control are the on-time of each switching element 14 of the inverter 8.

[0045] The control unit 15 performs power control based on the first current signal and the second current signal output from the first current sensor 10 and the second current sensor 11, respectively, so that the value of the power supplied to the overhead conveyor 120 becomes the target value.

[0046] In the contactless power supply system 110, contactless power supply devices 1A, 1B, 1C, 1D, and 1E are electrostatically coupled to each other. Figure 4 The example illustrates the configuration of electrostatic coupling between contactless power supply device 1A and contactless power supply device 1B. Figure 2 or Figure 4 As shown, the contactless power supply system 110 also includes a frame 111, an electrostatic coupling unit 112, and a switch (switching unit) 113.

[0047] The frame 111 houses the contactless power supply devices 1A, 1B, 1C, 1D, and 1E. The frame 111 is installed in the designated location at the factory.

[0048] Electrostatic coupling unit 112 electrostatically couples non-contact power supply device 1A and non-contact power supply device 1B. Electrostatic coupling unit 112 is connected to the output terminals (the ends connected to power supply lines 12A and 12B) of non-contact power supply devices 1A and 1B. Electrostatic coupling unit 112 includes capacitor C10 and capacitor C20. That is, non-contact power supply device 1A and non-contact power supply device 1B are electrostatically coupled through capacitor C10 and capacitor C20. Electrostatic coupling unit 112 is disposed within frame 111. That is, non-contact power supply devices 1A, 1B, 1C, 1D, and 1E are electrostatically coupled to each other within frame 111. In this embodiment, all non-contact power supply devices 1A, 1B, 1C, 1D, and 1E are electrostatically coupled through electrostatic coupling unit 112.

[0049] The electrostatic coupling unit 112 enables the supply of alternating current from the power supply lines 12A and 12B of the contactless power supply device 1A to the power supply lines 12A and 12B of the contactless power supply device 1B, or from the contactless power supply device 1B to the power supply lines 12A and 12B of the contactless power supply device 1A. In the electrostatic coupling unit 112, the capacitances of capacitors C10 and C20 are appropriately set. In this embodiment, the impedance of the electrostatic coupling unit 112 is set such that, when viewed from the side of the overhead conveyor 120 (the power receiving side), it is equal to the impedance of the second resonant circuit RC2 (power supply lines 12A and 12B). That is, the impedance of the electrostatic coupling unit 112 resonates with the impedance of the power supply lines 12A and 12B.

[0050] Switch 113 toggles the coupling and decoupling states of an electrostatic coupling device with other contactless power supply devices. That is, in... Figure 4 In the example shown, switch 113 switches the supply of alternating current from the contactless power supply device 1A to the power supply lines 12A and 12B of the contactless power supply device 1B, or from the contactless power supply device 1B to the power supply lines 12A and 12B of the contactless power supply device 1A, on / off. Switch 113 may be, for example, a circuit breaker, a magnetic conductor, an IGBT, or other semiconductor element.

[0051] In the contactless power supply system 110, when the AC power supplied from one contactless power supply device to one power supply line 12A, 12B decreases (voltage drops), AC power is supplied from other contactless power supply devices to one power supply line 12A, 12B. In the contactless power supply system 110, when the switch 113 is open, the supply of AC power from contactless power supply devices 1A, 1B, 1C, 1D, 1E to power supply lines 12A, 12B of other systems stops.

[0052] like Figure 1 as well as Figure 2 As shown, the elevated transport vehicle 120 travels along track T to transport items. The elevated transport vehicle 120 is configured to carry items. The number of elevated transport vehicles 120 in the transport system 100 is not particularly limited and can be multiple.

[0053] like Figure 5 As shown, the elevated transport vehicle 120 includes a power receiving unit 121, a drive unit 122, a transfer device 123, and a control unit 124.

[0054] The receiving unit 121 receives power from contactless power supply devices 1A, 1B, 1C, 1D, and 1E in a non-contact manner. The receiving unit 121 is a coil used to receive power. Magnetic flux generated by power supply lines 12A and 12B links with the receiving unit 121, thereby generating alternating current (AC) power in the receiving unit 121. The receiving unit 121 supplies AC power to the drive unit 122 and the transfer unit 123. Capacitors and reactors may also be connected between the receiving unit 121 and the drive unit 122 and the transfer unit 123.

[0055] The drive unit 122 rotates to drive multiple wheels (not shown). The drive unit 122 uses, for example, an electric motor or a linear motor, and uses power supplied from the power receiving unit 121 as the driving power.

[0056] The transfer device 123 is capable of holding and storing the transported items, and transferring the items. The transfer device 123 includes, for example, a lateral extension mechanism that holds and protrudes the items, and a lifting mechanism that moves the items downwards. By driving the lateral extension mechanism and the lifting mechanism, items are transferred to the loading ports of storage devices such as storage containers or processing devices, which are the destination for the transfer. The transfer device 123 uses electricity supplied from the power receiving unit 121 as the power for its operation.

[0057] The control device 124 controls the drive device 122 and the transfer device 123. The control device 124 uses the power supplied from the power receiving unit 121 as the power for drive.

[0058] As explained above, the delivery system 100 of this embodiment includes a contactless power supply system 110. The contactless power supply system 110 includes an electrostatic coupling unit 112 that electrostatically couples one contactless power supply device to other contactless power supply devices. Therefore, in the contactless power supply system 110, for example, even when AC power cannot be supplied from the contactless power supply device 1A to a power supply line 12A, 12B, AC power can still be supplied from the contactless power supply device 1B to a power supply line 12A, 12B. Thus, in the contactless power supply system 110, by using the electrostatic coupling unit 112 that electrostatically couples one contactless power supply device to other contactless power supply devices, AC power can be supplied to power lines 12A, 12B outside the controlled area. Therefore, in the contactless power supply system 110, by employing electrostatic coupling, there is no need for control to synchronize the current phase of the AC power supplied from each contactless power supply device 1A, 1B, 1C, 1D, 1E to the power lines 12A, 12B. Therefore, in the contactless power supply system 110, power can be supplied from the contactless power supply devices 1A, 1B, 1C, 1D, 1E to the power supply lines 12A, 12B of other systems through a simple configuration.

[0059] With the above configuration, in the contactless power supply system 110, even if AC power cannot be supplied to the power lines 12A and 12B from the contactless power supply devices 1A, 1B, 1C, 1D, and 1E due to malfunctions of some of them, the elevated transport vehicle 120 traveling in either the internal section BR1 or the interconnected section BR2 can be prevented from stopping. Furthermore, in the contactless power supply system 110, the contactless power supply devices 1A, 1B, 1C, 1D, and 1E are coupled separately via electrostatic coupling, thus enabling miniaturization of the device compared to coupling via electromagnetic coupling.

[0060] In the contactless power supply system 110 of this embodiment, the alternating currents flowing through the multiple power supply lines 12A and 12B are out of phase. In this configuration, since it is not necessary to synchronize the phases of the alternating currents, control for current phase synchronization is unnecessary. Therefore, control complexity can be avoided.

[0061] The contactless power supply system 110 of this embodiment includes a frame 111 that houses multiple contactless power supply devices 1A, 1B, 1C, 1D, and 1E. An electrostatic coupling unit 112 can also be housed within the frame. In this configuration, since multiple contactless power supply devices 1A, 1B, 1C, 1D, and 1E are electrostatically coupled within the frame 111, space saving is achieved.

[0062] The contactless power supply system 110 of this embodiment includes a switch 113 that switches between a coupling state and a decoupling state of electrostatic coupling between one contactless power supply device and other contactless power supply devices. In this configuration, the coupling and decoupling states of electrostatic coupling between one contactless power supply device and other contactless power supply devices can be switched arbitrarily. Therefore, for example, when performing maintenance on an internal section BR1, by disconnecting the switch 113 connected to the contactless power supply device of an internal section BR1, power can be withheld from the overhead conveyor 120 in that internal section BR1.

[0063] In the contactless power supply system 110 of this embodiment, multiple contactless power supply devices 1A, 1B, 1C, 1D, and 1E each have a second resonant circuit RC2. This second resonant circuit RC2 is disposed between the inverter 8, which converts the power supplied from the power source 2 into AC power, and the power supply lines 12A and 12B, and includes a reactor RT2 and a capacitor C2. In the contactless power supply system 110, viewed from the side of the overhead conveyor 120 receiving AC power, the impedance of the electrostatic coupling unit 112 is equal to the impedance of the second resonant circuit RC2. In this configuration, the impedance of the electrostatic coupling unit 112 can resonate with the impedance of the power supply lines 12A and 12B. Therefore, the transmission efficiency of the AC current can be improved.

[0064] The embodiments of the present invention have been described above, but the present invention is not necessarily limited to the above embodiments, and various modifications can be made without departing from its spirit.

[0065] In the above embodiment, an example of a contactless power supply system 110 including a switch 113 has been described. However, as... Figure 6 As shown, the contactless power supply system 110A may also omit the switch 113. In this configuration, the contactless power supply devices 1A and 1B include a capacitor C3.

[0066] In the above embodiment, an example was given of how all contactless power supply devices 1A, 1B, 1C, 1D, and 1E are electrostatically coupled by the electrostatic coupling unit 112. However, in the contactless power supply system 110, it is sufficient for at least two of the plurality of contactless power supply devices 1A, 1B, 1C, 1D, and 1E to be electrostatically coupled by the electrostatic coupling unit 112.

[0067] In the above embodiment, an example was given of a track T comprising an internal section BR1 and an interconnecting section BR2. However, the track T can also be a circular track. In this configuration, a track T can also be divided into multiple zones, with contactless power supply devices 1A, 1B, 1C, 1D, and 1E supplying AC power to each zone.

[0068] In the above embodiment, an example of an elevated transport vehicle 120 was described. However, the moving body is not limited to an elevated transport vehicle; any vehicle that travels on the track T is acceptable. For example, the vehicle can also be a ground transport vehicle (ground vehicle). In the case of a ground transport vehicle, the track is laid on the ground.

[0069] Explanation of symbols:

[0070] 1A, 1B, 1C, 1D, 1E: Non-contact power supply device; 2: Power supply; 8: Inverter; 9: Filter circuit; 12A, 12B: Power supply line; 100: Conveying system; 110, 110A: Non-contact power supply system; 111: Frame; 112: Electrostatic coupling part; 113: Switch (switching part); 120: Overhead conveyor vehicle (traveling vehicle); BR1: Internal section (area); BR2: Interconnected section (area); T: Track.

Claims

1. A contactless power supply system comprising: a plurality of power supply lines arranged along a track traveled by a vehicle; and a plurality of contactless power supply devices supplying AC power to the plurality of power supply lines respectively, wherein the contactless power supply system supplies power to the vehicle traveling on the track in a contactless manner, wherein... Each of the aforementioned contactless power supply devices has designated areas. Multiple of the aforementioned contactless power supply devices respectively supply AC power to the aforementioned power supply lines installed in the designated areas. The aforementioned contactless power supply system includes an electrostatic coupling unit that electrostatically couples one of the aforementioned contactless power supply devices with other of the aforementioned contactless power supply devices.

2. The contactless power supply system according to claim 1, wherein, The alternating currents flowing through the aforementioned power supply lines are out of phase with each other.

3. The contactless power supply system according to claim 1, wherein, The aforementioned contactless power supply system includes a frame that houses multiple contactless power supply devices. The electrostatic coupling part is housed within the frame.

4. The contactless power supply system according to claim 2, wherein, The aforementioned contactless power supply system includes a frame that houses multiple contactless power supply devices. The electrostatic coupling part is housed within the frame.

5. The contactless power supply system according to any one of claims 1 to 4, wherein, The aforementioned contactless power supply system includes a switching unit that switches between the coupling state and the non-coupling state of one of the aforementioned contactless power supply devices and other contactless power supply devices.

6. The contactless power supply system according to any one of claims 1 to 4, wherein, Each of the aforementioned contactless power supply devices has a filter circuit, which is installed between the inverter that converts the power supplied by the power source into the aforementioned AC power and the aforementioned power supply line, and includes a reactor and a capacitor. Viewed from the side of the vehicle receiving the aforementioned AC power supply, the impedance of the electrostatic coupling section is equal to the impedance of the aforementioned filter circuit.

7. The contactless power supply system according to claim 5, wherein, Each of the aforementioned contactless power supply devices has a filter circuit, which is installed between the inverter that converts the power supplied by the power source into the aforementioned AC power and the aforementioned power supply line, and includes a reactor and a capacitor. Viewed from the side of the vehicle receiving the aforementioned AC power supply, the impedance of the electrostatic coupling section is equal to the impedance of the aforementioned filter circuit.

8. A conveying system comprising: The contactless power supply system according to any one of claims 1 to 7; and The vehicle travels by receiving power from the aforementioned contactless power supply system.

Images