Non-contact power supply system, computer program, power reception device, and power transmission device

Abstract

A non-contact power supply system (1000, 1000A, 1000B) is provided with: a power transmission circuit (110, 110A) that receives power supply from a system power supply (PS) and supplies high-frequency AC power at a predetermined operating frequency; a plurality of power transmission devices (120, 120A, 120B) that are connected in parallel to each other with respect to the power transmission circuit and that are capable of contactless power supply; a plurality of power receiving devices (200) capable of receiving power from the power transmitting devices in a non-contact manner when located at any position within a power transmitting region in which power transmission can be performed by the power transmitting devices; and a power supply suppression unit (400) that controls each of the power receiving devices such that the total of the power supply requested from the plurality of power receiving devices does not exceed the power that can be output, and that each of the power receiving devices transmits power receiving device-side information to the power supply suppression unit. The supplied power suppression unit controls each of the power receiving devices using the power receiving device-side information.

Description

Reference to Related Applications

[0001] This application is based on Japanese Patent Application No. 2023-61079 filed on April 5, 2023, the contents of which are hereby incorporated by reference. TECHNICAL FIELD

[0002] The present disclosure relates to a non-contact power feeding system, a computer program, a power receiving device, and a power feeding device. BACKGROUND

[0003] A power feeding system that feeds power to an electric vehicle is known. When a plurality of electric vehicles are fed power in such a power feeding system, it is necessary to feed power in such a manner that the power feeding power does not exceed the power output capability of a power source device. The charging system described in Patent Literature 1 suppresses a situation in which the power feeding power is excessively large by simultaneously charging in a plurality of charging devices by acquiring the remaining amount of a charge battery of each electric vehicle and a moving destination and deciding a charging plan of a charging device provided in each household. Prior Art Documents Patent Literature

[0004] Patent Literature 1: Japanese Patent Application Laid-Open No. 2013-65265 SUMMARY

[0005] However, in a power feeding system that targets an electric vehicle that feeds power while traveling in a power feedable region such as an AGV (Automatic Guided Vehicle) or a fixed device that feeds power while working, and the like, the timing of power feeding or the power feeding amount greatly varies depending on the working conditions of the electric vehicle or the fixed device equipped with a power receiving device. Therefore, according to the manner of controlling the charging plan of a charging device as described in the charging system of Patent Literature 1, it is not possible to sufficiently suppress the power feeding power depending on the working conditions of the electric vehicle or the fixed device.

[0006] The present disclosure can be implemented in the following manner.

[0007] According to one embodiment of the present disclosure, a non-contact power feeding system is provided. The non-contact power feeding system includes: a power feeding circuit that receives electric power from a system power supply and performs supply of high-frequency alternating-current electric power of a predetermined operation frequency; a plurality of power feeding devices that are connected in parallel with respect to the power feeding circuit and are capable of non-contact power feeding; a plurality of power receiving devices that are capable of receiving power in a non-contact manner from the power feeding devices when positioned at any position within a power feeding region capable of power feeding by each of the power feeding devices; and a power feeding electric power suppression section that controls each of the power receiving devices such that a total of power feeding electric power requested from the plurality of power receiving devices does not exceed an output electric power that the system power supply and the power feeding circuit are capable of continuously supplying, each of the power receiving devices transmits power receiving device-side information indicating an operation state of the power receiving device to the power feeding electric power suppression section, and the power feeding electric power suppression section controls each of the power receiving devices using the power receiving device-side information.

[0008] According to the control device of the embodiment, each of the power receiving devices is controlled using the power receiving device-side information such that the total of the power feeding electric power requested from the plurality of power receiving devices does not exceed the output electric power, and thus the power feeding electric power can be adjusted in accordance with the operation state of each of the power receiving devices. BRIEF DESCRIPTION OF DRAWINGS

[0009] The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: Figure 1 is a diagram illustrating a schematic configuration of a non-contact power feeding system according to a first embodiment. Figure 2 is a diagram illustrating a circuit configuration of a power feeding circuit according to the first embodiment. Figure 3 is a diagram illustrating a circuit configuration of a non-contact power feeding system according to the first embodiment. Figure 4 is a flowchart illustrating steps of control performed by a power feeding electric power suppression section in power feeding electric power suppression control according to the first embodiment. Figure 5 is a flowchart illustrating steps of control performed by a power receiving device in power feeding electric power suppression control according to the first embodiment. Figure 6 is a flowchart illustrating steps of control performed by a power feeding electric power suppression section in power feeding electric power suppression control according to a second embodiment. Figure 7 is a flowchart illustrating steps of control performed by a power feeding electric power suppression section in power feeding electric power suppression control according to a fourth embodiment. Figure 8is a flowchart showing steps of control performed by the power receiving device in the power feeding power suppression control of the fifth embodiment. Figure 9 is a flowchart showing steps of control performed by the power receiving device in the power feeding power suppression control of the sixth embodiment. Figure 10 is an explanatory diagram showing a circuit structure of a power feeding circuit of another embodiment. Figure 11 is an explanatory diagram showing a circuit structure of a non-contact power feeding system of another embodiment. Figure 12 is an explanatory diagram showing a circuit structure of a non-contact power feeding system of another embodiment. DETAILED DESCRIPTION

[0010] A. First Embodiment: A-1. Device Structure: The non-contact power feeding system 1000 of the present embodiment is a system that performs power feeding from the power feeding system 100 to the power receiving device 200 installed on a mobile body such as an AGV (Automatic Guided Vehicle) or a fixed device such as a multi-joint robot for carrying or a carrier in a non-contact manner in a factory or a warehouse. In the following description, the power receiving device 200 installed on a mobile body will be referred to as a "mobile power receiving device" and the power receiving device 200 installed on a fixed device will be referred to as a "fixed power receiving device" as needed to distinguish between them. As shown in Figure 1 The non-contact power feeding system 1000 includes the power feeding system 100, the power receiving device 200, and the control device 300. In the present embodiment, the power feeding system 100 is buried under the floor 105. In Figure 1 In Figure 1 , the x-axis direction indicates the traveling direction of the electric vehicle 202, the y-axis direction indicates the width direction of the electric vehicle 202, and the z-axis direction indicates the plumb direction. In addition, the structure of the power receiving device 200 as a fixed power receiving device is the same as that of the power receiving device 200 as a mobile power receiving device, and thus the illustration thereof is omitted in Figure 1 In addition, the non-contact power feeding system 1000 includes a plurality of power receiving devices 200, but the illustration thereof is omitted in Figure 1 , because they are the same structure respectively.

[0011] The power feeding system 100 includes a power feeding circuit 110 and a plurality of power feeding devices 120. The power feeding circuit 110 receives alternating-current power from a system power source PS and converts it into alternating-current power of a predetermined operation frequency. As Figure 2As shown, the power supply circuit 110, starting from the side connected to the system power supply PS, sequentially includes a noise filter 111, a PFC (Power Factor Correction) circuit 112, an inverter 113, and a high-frequency filter 114. In this embodiment, the two power supply circuits 110 are connected in parallel with respect to the system power supply PS. Alternatively, the power supply circuit 110 may be connected to only one system power supply PS, or three or more may be connected in parallel with each other.

[0012] Noise filter 111 removes noise from the AC power supplied from the system power supply PS. PFC circuit 112 is a well-known circuit that improves power by eliminating the phase difference between input voltage and output current caused by noise removal in noise filter 111, suppressing higher harmonics, and bringing the power factor close to 1. The AC power supplied from the system power supply PS is converted to DC power and smoothed by noise filter 111 and PFC circuit 112. Inverter 113 converts the supplied DC power into high-frequency AC power. High-frequency filter 114 extracts AC power with a predetermined operating frequency from the supplied high-frequency AC power and allows it to pass through. The AC power after passing through high-frequency filter 114 is supplied to each power transmission unit 120 via AC power transmission bus BSac.

[0013] like Figure 1 As shown, multiple power supply devices 120 are installed underground along the x-axis of the floor 105. The power supply devices 120 can also be installed in locations other than the floor 105, such as on the side of a fixed device. Furthermore, each power supply device 120 is connected in parallel with respect to the power supply circuit 110 and receives AC power from the power supply circuit 110. Each power supply device 120 has a primary resonant circuit 10. The primary resonant circuit 10 receives AC power from the power supply circuit 110 and transmits AC power non-contactly relative to the secondary resonant circuit 240, which will be described later. The specific structure of the primary resonant circuit 10 will be described later.

[0014] The power receiving device 200 receives power from the power transmitting device 120 when the power receiving device 200 is located within a predetermined area (hereinafter, also referred to as a "power transmitting area") for each power transmitting device 120 and a predetermined power supply condition is satisfied. In the present embodiment, in the mobile power receiving device, the power supply condition is that the electric vehicle 202 is in motion and a power supply permission notification described later is received. The "electric vehicle 202 is in motion" includes a case where the electric vehicle 202 is stopped near a stationary device such as a transport robot or a carrier due to loading and unloading of a transported object, in addition to a case where the electric vehicle 202 is moving. In the stationary power receiving device, the power supply condition is that the stationary device is in a transport operation such as loading and unloading of a transported object and the power supply permission notification described later is received. The power supply condition is not limited to the above, and can be arbitrarily set to supply power at an appropriate frequency according to an operation performed by each device in which the power receiving device 200 is installed.

[0015] The power receiving device 200 includes a battery 210, an auxiliary battery 215, a power receiving side control unit 220, a power receiving circuit 230, a secondary side resonance circuit 240, a DC / DC converter circuit 260, an inverter circuit 270, a motor generator 280, and an auxiliary device 290. In addition, the power receiving device 200 can not include the auxiliary device 290, and in this case, the auxiliary battery 215 and the DC / DC converter circuit 260 can also not be included. In the present embodiment, the secondary side resonance circuit 240 is provided at a position facing the floor 105, such as the lower surface of the electric vehicle 202. In addition, in a case where the power transmitting device 120 is arranged on the side surface of the stationary device, the secondary side resonance circuit 240 can also be provided on the side surface of the electric vehicle 202. The detailed structure of the secondary side resonance circuit 240 will be described later.

[0016] The secondary side resonance circuit 240 is connected to the power receiving circuit 230, and alternating-current power received by the secondary side resonance circuit 240 is converted to direct-current power by the power receiving circuit 230. The battery 210, the high-voltage side of the DC / DC converter circuit 260, and the inverter circuit 270 are connected at the output of the power receiving circuit 230. The auxiliary battery 215 and the auxiliary device 290 are connected at the low-voltage side of the DC / DC converter circuit 260. The inverter circuit 270 is connected to the motor generator 280. Direct-current power output from the power receiving circuit 230 can be used for charging of the battery 210 or driving of the motor generator 280 via the inverter circuit 270. In addition, the direct-current power output from the power receiving circuit 230 can also be used for charging of the auxiliary battery 215 or driving of the auxiliary device 290 by being stepped down using the DC / DC converter circuit 260.

[0017] The battery 210 is a secondary battery that outputs relatively high direct-current electric power, for example, a voltage of several tens of V to several hundred V, for driving the motor generator 280. The motor generator 280 operates as a three-phase alternating-current motor and generates a driving force for running of the electric vehicle 202. The motor generator 280 operates as a generator when the electric vehicle 202 decelerates and regenerates electric power. The inverter circuit 270 converts electric power of the battery 210 into three-phase alternating current and supplies it to the motor generator 280 when the motor generator 280 operates as a motor. The inverter circuit 270 converts three-phase alternating current regenerated by the motor generator 280 into direct current and supplies it to the battery 210 when the motor generator 280 operates as a generator. In addition, the battery 210 corresponds to the "load device" of the present disclosure.

[0018] The DC / DC converter circuit 260 converts the output of the battery 210 into a voltage lower than the output voltage of the battery 210, for example, 12 V, and supplies it to the auxiliary battery 215 and the auxiliary equipment 290. The auxiliary battery 215 is a secondary battery for driving the auxiliary equipment 290, and has a relatively low voltage. The auxiliary equipment 290 includes peripheral devices of the electric vehicle 202 and various accessories of the electric vehicle 202.

[0019] The power-receiving-side control portion 220 controls each portion except for the inverter circuit 270 in the electric vehicle 202. The power-receiving-side control portion 220 controls the power-receiving circuit 230 to receive electric power when power feeding is accepted.

[0020] The power-receiving-side control portion 220 is configured to be able to communicate with the control device 300. The power-receiving-side control portion 220 transmits power-receiving-device-side information indicating the state of the power-receiving device 200 to the control device 300, and receives various notifications described later transmitted from the control device 300. In the present embodiment, the "power-receiving-device-side information" refers to information including at least one of position information of the power-receiving device 200, information indicating whether the power-receiving device 200 is located in the power feeding area, the SOC (States Of Charge) of the battery 210, the remaining electric power amount of the battery 210, the current power feeding electric power, and the current consumed electric power. These information are detected by various sensors included in the power-receiving device 200 and transmitted to the power-receiving-side control portion 220.

[0021] The control device 300 is configured as a computer having a CPU 310, a memory 320, and a communication device 330. The CPU 310 functions as the power feeding power suppression portion 400 by executing a program stored in advance in the memory 320.

[0022] The power supply suppression unit 400 controls the powered devices 200 to ensure that the total power requested from multiple powered devices 200 (hereinafter also referred to as "requested power") does not exceed the output power. "Output power" refers to the power that the system power supply PS and the power transmission circuit 110 can continuously supply. Furthermore, the output power can be set to a level below the rated output power of the system power supply PS and the power transmission circuit 110, as long as it is sufficient to prevent the system power supply PS and the power transmission circuit 110 from immediately ceasing operation. Alternatively, it can be set to a level greater than the rated output power, for example, a power several kW greater than the rated output power. In this embodiment, the output power of the power transmission circuit 110 is preset. The specific control of the power supply suppression unit 400 will be explained later.

[0023] A-2. Circuit Structure: like Figure 3 As shown, the power transmission device 120 includes a primary-side coil Ls, an impedance variable element 20, a primary-side detection circuit 30, and a primary-side control circuit 40. Additionally, in Figure 3 In this diagram, only one of the multiple power supply devices 120 connected in parallel with the power supply circuit 110 is shown; the other power supply devices 120 are omitted from the illustration.

[0024] The variable impedance element 20 is connected in series with the primary side coil Ls between the power supply circuit 110 and the primary side coil Ls, and together with the primary side coil Ls, forms the primary side resonant circuit 10. The variable impedance element 20 includes two capacitors C11 and C12 and a switch SW1. Capacitor C11 is connected in series with the primary side coil Ls. Capacitor C12 is connected in series with the switch SW1, and the series-connected capacitor C12 and switch SW1 are connected in parallel with capacitor C11. Switch SW1 can switch mechanical contacts such as relays according to external indications, but it can also be configured to use semiconductor elements such as MOS-FETs or analog switches. Capacitors C11 and C12 are equivalent to the "primary side capacitors" in this disclosure.

[0025] The impedance variable element 20 changes the electric capacity by switching on / off of the switch SW1. When the switch SW1 is on, the capacitor C12 is connected to the primary-side coil Ls. At this time, the electric capacity of the impedance variable element 20 is equal to the sum of the electric capacity of the capacitor C11 and the electric capacity of the capacitor C12. On the other hand, when the switch SW1 is off, the capacitor C12 is disconnected from the primary-side coil Ls. At this time, the electric capacity of the impedance variable element 20 is equal to the electric capacity of the capacitor C11. In this way, since the electric capacity of the impedance variable element 20 changes, the impedance of the primary-side resonance circuit 10 when the switch SW1 is on is lower than when the switch SW1 is off. With the change of the impedance of the primary-side resonance circuit 10, the resonance state of the primary-side resonance circuit 10 also changes. In the present embodiment, the primary-side resonance circuit 10 becomes the resonance state at the operation frequency when the switch SW1 is on, and becomes the power transmission state. On the other hand, the primary-side resonance circuit 10 becomes the non-resonance state at the operation frequency when the switch SW1 is off, and becomes the standby state. In the standby state, the power transmission device 120 causes a standby current, which is smaller than the current flowing in the power transmission state, to flow through the primary-side coil Ls, and generates the magnetic flux.

[0026] The primary-side detection circuit 30 has a magnetic flux sensor that detects the magnitude of the magnetic flux that links with the primary-side coil Ls, and a current sensor that detects the magnitude of the current flowing through the primary-side coil. In the present embodiment, the magnetic flux sensor detects the magnitude of the magnetic flux using the change in the voltage applied to a detection coil that is magnetically coupled with the primary-side coil Ls. On the other hand, the current sensor detects the magnitude of the current using the change in the voltage applied to the capacitor C11. The primary-side detection circuit 30 outputs a signal indicating the detected magnitude of the magnetic flux and a signal indicating the magnitude of the current to the primary-side control circuit 40.

[0027] The primary-side control circuit 40 drives the switch SW1 to switch on / off of the switch SW1 using the signals output from the primary-side detection circuit 30. More specifically, the primary-side control circuit 40 sets the switch SW1 to on when the magnitude of the magnetic flux indicated by the signals output from the primary-side detection circuit 30 is equal to or greater than a predetermined threshold value. On the other hand, the primary-side control circuit 40 sets the switch SW1 to off when the magnitude of the current indicated by the signals output from the primary-side detection circuit 30 is equal to or greater than the threshold value. The magnitude of the current and the magnitude of the magnetic flux change depending on the degree of magnetic coupling between the power transmission device 120 and the power receiving device 200. In the non-resonance state, the magnitude of the magnetic flux becomes larger as the power transmission device 120 approaches the power receiving device 200. On the other hand, in the resonance state, the magnitude of the current becomes smaller as the power transmission device 120 approaches the power receiving device 200. The threshold values of the magnitude of the magnetic flux and the magnitude of the current are determined and set by simulation or the like in advance as values when the power receiving device 200 enters the power transmission region.

[0028] The circuit structure of the power receiving device 200 will be described. Also, in Figure 3 the circuit structure of the power receiving device 200, the circuit structure related to the power supply to the battery 210 is particularly illustrated, and other parts are omitted. As Figure 3 indicated, the secondary side resonance circuit 240 is a series connection of the secondary side coil Lr and a secondary side capacitor Cr. Further, the power receiving device 200 includes a secondary side detection circuit 250 in addition to the structure indicated in Figure 1

[0029] The secondary side detection circuit 250 has a magnetic flux sensor that detects the magnitude of the magnetic flux interlinked with the secondary side coil Lr. In the present embodiment, the magnetic flux sensor detects the magnitude of the magnetic flux using the change in the voltage applied to a detection coil that is magnetically coupled with the secondary side coil Lr. The secondary side detection circuit 250 outputs a signal indicating the detected magnitude of the magnetic flux to the power receiving side control section 220.

[0030] The power receiving side control section 220 determines whether the power receiving device 200 is located within the power transmission region using the magnitude of the magnetic flux indicated by the signal output from the secondary side detection circuit 250. More specifically, in the case where the magnitude of the magnetic flux is equal to or greater than a threshold value set in advance, the power receiving side control section 220 determines that the power receiving device 200 is located within the power transmission region. The threshold value of the magnitude of the magnetic flux is determined and set by simulation or the like in advance as the value when the power receiving device 200 enters the power transmission region. Also, in the structure in which the power receiving side control section 220 does not transmit information indicating whether the power receiving device 200 is located within the power transmission region to the control device 300 as the power receiving device side information, the power receiving device 200 can not include the secondary side detection circuit 250.

[0031] In the present embodiment, the power receiving circuit 230 has a rectification circuit 231 and a DC-DC converter 232. The rectification circuit 231 is constituted by four switching elements Q21 to Q24 that constitute a bridge circuit and a smoothing capacitor C22. In the present embodiment, the switching elements Q21 to Q24 are implemented by MOSFETs. The rectification circuit 231 switches the on / off state of the switching elements Q21 to Q24 according to the control of the power receiving side control section 220, and performs switching of the conversion of the alternating-current power input from the secondary side resonance circuit 240 to direct-current power and the execution / stop of the supply of the direct-current power to the battery 210. The DC-DC converter 232 performs voltage conversion on the direct-current power supplied from the rectification circuit 231 and supplies it to the battery 210 according to the control of the power receiving side control section 220.

[0032] A-3. Power supply power suppression control: As Figure 4 and Figure 5 ​As illustrated, each power receiving device 200 of the present embodiment transmits the above-described power receiving device side information to the power feeding power regulating section 400, and starts or stops power feeding in accordance with various notifications transmitted by the power feeding power regulating section 400. Control achieved by the control performed in the power receiving device 200 and the power feeding power regulating section 400 is also referred to as "power feeding power regulating control".

[0033] The power feeding power regulating section 400 starts Figure 4 As illustrated, the control is repeatedly performed during the period in which the control device 300 is started. In step S110, the power receiving device side information received from each power receiving device 200 is used to determine the power receiving device 200 to which power feeding is permitted (hereinafter, also referred to as "power feeding permitted power receiving device"). More specifically, the power feeding power regulating section 400 determines the power feeding permitted power receiving device with the power receiving device 200 of at least a part of the plurality of power receiving devices 200 as the target (hereinafter, also referred to as "notification target power receiving device"). In the present embodiment, the power feeding power regulating section 400 takes the power receiving device 200 located within the power feeding region among the plurality of power receiving devices 200 as the notification target power receiving device.

[0034] The determination of the power feeding permitted power receiving device is described in more detail. As described above, as the power receiving device side information, the power feeding power regulating section 400 receives information including the position information of the power receiving device 200, information indicating whether the power receiving device 200 is located within the power feeding region, the SOC of the battery 210, the remaining power amount of the battery 210, the current power feeding power, and at least one of the current consumption power from each power receiving device 200. The power feeding power regulating section 400 can determine the power feeding device 120 with which the power receiving device 200 can be magnetically coupled using at least one of the position information of each power receiving device 200 and the information indicating whether each power receiving device 200 is located within the power feeding region, and can estimate the requested power feeding power in accordance with the number of power feeding devices 120 with which the power receiving device 200 can be magnetically coupled. Further, the power feeding power regulating section 400 can estimate the requested power feeding power of each power receiving device 200 using the SOC or the remaining power amount of the battery 210. In addition, the power feeding power regulating section 400 can estimate the requested power feeding power of each power receiving device 200 even using the current power feeding power or the consumption power of the power receiving device 200. In this way, the power feeding power regulating section 400 determines the power feeding permitted power receiving device in such a manner that the requested power feeding power does not exceed the output power of the power feeding circuit 110 using the requested power feeding power estimated by the power receiving device side information. For example, the power feeding power regulating section 400 adds the requested power feeding power of each power receiving device 200 in the order in which the power receiving device side information is received, and takes each power receiving device 200 associated with the power receiving device side information received before the total of the requested power feeding power reaches the output power as the power feeding permitted power receiving device.

[0035] In step S120, the power supply power suppression section 400 determines whether or not to allow power supply for each notified power receiving device. In a case where it is determined to allow power supply (step S120: YES), the power supply power suppression section 400 transmits a power supply permission notification and a power supply power notification to the notified power receiving device for which power supply is allowed (step S130). The "power supply permission notification" refers to a notification to the power receiving device 200 that power supply is allowed. The "power supply power notification" refers to a notification to the power receiving device 200 of the power that can be supplied.

[0036] On the other hand, in a case where it is determined not to allow power supply (step S120: NO), the power supply power suppression section 400 transmits a power supply non-permission notification to the power receiving device 200 for which power supply is not allowed (step S140). The "power supply non-permission notification" refers to a notification to the power receiving device 200 that power supply is not allowed. The power supply power suppression section 400 repeatedly performs the control described above. Each power receiving device 200 starts the control illustrated in FIG. 2 when entering the power transmission region Figure 5 As illustrated in FIG. 2, the control is repeatedly performed during the staying in the power transmission region. As illustrated in FIG. 2, the power receiving device 200 performs the control of step S210 and the controls of steps S220, S230, S240, and S250 in parallel. Figure 5

[0038] In step S210, the power receiving side control section 220 transmits power receiving device side information to the power supply power suppression section 400. In the present embodiment, the power receiving side control section 220 repeatedly performs the present step each time a predetermined time elapses.

[0039] In step S220, the power receiving side control section 220 determines whether or not the power supply permission notification and the power supply power notification are received. In a case where it is determined that the power supply permission notification and the power supply power notification are not received (step S220: NO), the power receiving side control section 220 repeatedly performs the determination.

[0040] In a case where it is determined that the power supply permission notification and the power supply power notification are received (step S220: YES), the power receiving side control section 220 controls the power receiving circuit 230 and starts power supply with the allowed power supply power (step S230). More specifically, the power receiving side control section 220 controls the rectifier circuit 231 and starts power supply, and controls the DC-DC converter 232 and controls the power supply power supplied to the battery 210.

[0041] In step S240, the power receiving side control section 220 determines whether or not the power supply non-permission notification is received. In a case where it is determined that the power supply non-permission notification is not received (step S240: NO), the power receiving side control section 220 controls the power receiving circuit 230 and continues power supply. ​

[0042] If a power supply disallowance notification is received (step S240: Yes), the power receiving side control unit 220 controls the power receiving circuit 230 to stop power supply (step S250). More specifically, the power receiving side control unit 220 controls the rectifier circuit 231 to stop power supply. Afterwards, the power receiving side control unit 220 executes step S220 again.

[0043] The contactless power supply system 1000 according to the first embodiment described above uses information from the power receiving device side to control each power receiving device 200 in a manner that the total power supply requested from multiple power receiving devices 200 does not exceed the output power. Therefore, the power supply can be adjusted according to the operating status of each power receiving device 200.

[0044] Furthermore, the contactless power supply system 1000 sends a power supply permission notification or a power supply disallowance notification to the powered device 200. Upon receiving the power supply permission notification, the powered device 200 performs power supply. Therefore, it is possible to selectively supply power to a portion of the powered devices 200 and to suppress the supplied power. Alternatively, the contactless power supply system 1000 sends a power supply notification to the powered device 200, and the powered device 200 performs power supply with the permitted power specified in the power supply notification. Therefore, by notifying the permitted power supply relative to the normally suppressed power supply based on the operating status of the powered device 200, the supplied power can be suppressed. In addition, compared to a structure that simultaneously supplies power to all powered devices 200 or always supplies power at maximum power, it is possible to suppress the power supply capacity required by the power transmission circuit 110 and reduce the implementation cost of the contactless power supply system 1000.

[0045] B. Second implementation method: like Figure 6 As shown, the difference between the contactless power supply system 1000 of the second embodiment and the contactless power supply system 1000 of the first embodiment lies in that, in the power supply suppression control, the power supply suppression unit 400 further executes steps S102, S122, and S132. Furthermore, since the system structure and other steps in the power supply suppression control of the contactless power supply system 1000 of the second embodiment are the same as those of the contactless power supply system 1000 of the first embodiment, the same symbols are used to mark the same structures and steps, and detailed descriptions are omitted.

[0046] In this embodiment, as power receiving device side information, each power receiving device 200 sends information including at least one of the following: the SOC of the battery 210, the remaining power of the battery 210, and the current power consumption to the power supply suppression unit 400.

[0047] like Figure 6As shown, in step S102, the power supply power suppression section 400 determines the priority power receiving device using the power receiving device side information. The "priority power receiving device" refers to a power receiving device 200 that is allowed to be supplied with power preferentially among the plurality of notification target power receiving devices. The power supply power suppression section 400 may, for example, compare the SOC or the residual power amount of the battery 210 of each notification target power receiving device, and select the notification target power receiving devices of a predetermined number in order from low to high in the SOC or the residual power amount of the battery 210, and determine them as the priority power receiving devices. This is because the device provided with such a power receiving device 200 can not be able to continue to operate due to power shortage, and the necessity of power supply is high. Further, the power supply power suppression section 400 may, for example, compare the power consumption of each notification target power receiving device, and select the notification target power receiving devices of a predetermined number in order from high to low in the power consumption, and determine them as the priority power receiving devices. The device provided with such a power receiving device 200 can consume power in a short time and can not be able to continue to operate due to power shortage, and the necessity of power supply is high.

[0048] In step S110, the power supply power suppression section 400 determines the power supply allowable power receiving device to transmit the power supply allowable notification preferentially to the priority power receiving device.

[0049] In a case where it is determined that the power supply to the notification target power receiving device of the determination target is allowed (step S120: Yes), and in a case where the notification target power receiving device is the priority power receiving device (step S122: Yes), the power supply power suppression section 400 executes the above-described step S130, and executes step S102 again.

[0050] On the other hand, in a case where it is determined that the power supply to the notification target power receiving device of the determination target is allowed (step S120: Yes), and in a case where the power receiving device 200 is not the priority power receiving device (step S122: No), the power supply power suppression section 400 transmits the power supply power notification of the power supply power after the suppression with respect to the power supply power indicated by the power supply power notification transmitted in step S130, together with the power supply allowable notification (step S132). In other words, the power supply power suppression section 400 notifies the power supply power after the suppression with respect to the power supply power notified to the priority power receiving device, with respect to the notification target power receiving device that is the power supply allowable power receiving device but is not the priority power receiving device. After step S132 ends, the power supply power suppression section 400 executes step S102 again.

[0051] The non-contact power feeding system 1000 according to the second embodiment described above functions in the same manner as the non-contact power feeding system 1000 according to the first embodiment. In addition to this, since the priority power receiving device is determined and the power feeding permission notification is preferentially transmitted to the priority power receiving device, it is possible to preferentially perform power feeding to the power receiving device 200 for which the necessity of power feeding is high, and it is possible to suppress the device provided with the power receiving device 200 from stopping operation due to the inability to feed power.

[0052] In addition, with respect to the notification target power receiving device that is not the priority power receiving device, even in the case where power feeding is permitted, the power feeding power suppression section 400 notifies the power feeding power after suppression with respect to the priority power receiving device, and thus it is also possible to suppress the total of the power feeding powers from exceeding the output power.

[0053] C. Third Embodiment The non-contact power feeding system 1000 according to the third embodiment differs from the non-contact power feeding system 1000 according to the second embodiment in the method of determining the priority power receiving device. In addition, since the system structure and other steps in the power feeding power suppression control of the non-contact power feeding system 1000 according to the third embodiment are the same as those of the non-contact power feeding system 1000 according to the second embodiment, the same reference numerals are attached to the same structures and the same steps, and detailed description thereof is omitted.

[0054] In the step S102 described above, the power feeding power suppression section 400 preferentially determines the mobile power receiving device as the priority power receiving device with respect to the fixed power receiving device. The power feeding power suppression section 400 may, for example, compare the SOCs or the residual power amounts of the batteries 210 of the mobile power receiving devices in the notification target power receiving devices, and select the mobile power receiving devices of a predetermined number in order from low to high in the SOCs or the residual power amounts of the batteries 210 and determine as the priority power receiving device. In addition, the power feeding power suppression section 400 may, for example, compare the power consumptions of the mobile power receiving devices in the notification target power receiving devices, and select the mobile power receiving devices of a predetermined number in order from high to low in the power consumptions and determine as the priority power receiving device.

[0055] The non-contact power feeding system 1000 according to the third embodiment described above functions in the same manner as the non-contact power feeding system 1000 according to the second embodiment. In addition to this, since the power receiving permission notification is preferentially transmitted to the mobile power receiving device, it is possible to preferentially perform power feeding to the mobile power receiving device for which the power feeding opportunity is less compared to the fixed power receiving device, and it is possible to suppress the mobile power receiving device from stopping operation due to the inability to feed power.

[0056] D. Fourth Embodiment As Figure 7The fourth embodiment of the non-contact power feeding system 1000 differs from the first embodiment of the non-contact power feeding system 1000 in that the power feeding power suppression section 400 further executes step S104 in the power feeding power suppression control. The system structure of the fourth embodiment of the non-contact power feeding system 1000 and other steps in the power feeding power suppression control are the same as those of the first embodiment of the non-contact power feeding system 1000, and therefore the same reference numerals are assigned to the same structures and the same steps, and detailed descriptions thereof are omitted.

[0057] In the present embodiment, each power receiving device 200 transmits information including at least the SOC of the battery 210 to the power feeding power suppression section 400 as power receiving device side information.

[0058] In step S104, the power feeding power suppression section 400 determines the maximum power receiving device using the power receiving device side information. The "maximum power receiving device" refers to a power receiving device in which the SOC of the battery 210 is less than a threshold value set in advance among the plurality of notification target power receiving devices, and which is capable of performing power feeding based on the upper limit power feeding of the power feeding device 120. In addition, the power feeding is determined according to the SOC of the battery 210, and the lower the SOC, the more the power feeding can be performed with large power.

[0059] In step S110, the power feeding power suppression section 400 determines only the maximum power receiving device as the power feeding allowable power receiving device. In addition, the determination of several power feeding allowable power receiving devices from among the plurality of maximum power receiving devices can be arbitrarily determined according to the upper limit power feeding of the power feeding device 120 and the output power of the power feeding circuit 110.

[0060] The control after step S120 is the same as that of the first embodiment described above, but since only the maximum power receiving device is determined as the power feeding allowable power receiving device in step S110, the power feeding allowable notification and the power feeding power notification are transmitted only to the maximum power receiving device in step S130. The non-contact power feeding system 1000 according to the fourth embodiment described above has the same effects as the non-contact power feeding system 1000 according to the first embodiment. In addition, since the power feeding allowable notification is transmitted only to the maximum power receiving device, it is possible to suppress a decrease in the frequency of power feeding execution based on the upper limit power feeding of the power feeding device 120, and it is possible to suppress a decrease in the power feeding efficiency in the non-contact power feeding system 1000.

[0062] E. Fifth Embodiment: As Figure 8As shown, the difference between the contactless power supply system 1000 of the fifth embodiment and the contactless power supply system 1000 of the first embodiment is that, in the power supply suppression control, the receiving device 200 further executes step S260. Furthermore, the system structure and other steps in the power supply suppression control of the contactless power supply system 1000 of the fifth embodiment are the same as those of the contactless power supply system 1000 of the first embodiment; therefore, the same symbols are used to mark the same structures and steps, and detailed descriptions are omitted.

[0063] If, in step S220, it is determined that no power supply permission notification or power supply notification has been received (step S220: No), in other words, if a power supply disallowance notification has been received, the power receiving side control unit 220 causes the electric vehicle 202 to retreat outside the power supply area (step S260). More specifically, the power receiving side control unit 220 controls the electric vehicle 202 via an ECU (not shown) installed on the electric vehicle 202 and controlling the movement of the electric vehicle 202.

[0064] The contactless power supply system 1000 of the fifth embodiment described above achieves the same effect as the contactless power supply system 1000 of the first embodiment. Furthermore, since the receiving device 200, upon receiving a power supply prohibition notification, retreats from the power supply area, the chances of power supply devices with a higher need for power supply being reduced, and the inability of the receiving device 200 to stop operating due to power supply failure can be prevented.

[0065] F. Sixth Implementation Method: like Figure 9 As shown, the difference between the contactless power supply system 1000 of the sixth embodiment and the contactless power supply system 1000 of the fifth embodiment is that, in the power supply suppression control, the receiving device 200 performs step S262 instead of step S260, and further performs step S222. Furthermore, the system structure and other steps in the power supply suppression control of the contactless power supply system 1000 of the fifth embodiment are the same as those of the contactless power supply system 1000 of the fifth embodiment; therefore, the same symbols are used to mark the same structures and steps, and detailed descriptions are omitted.

[0066] If it is determined in step S220 that no power supply permission notification or power supply notification has been received (step S220: No), in other words, if a power supply disallowment notification is received, the power receiving side control unit 220 controls the power receiving circuit 230 and transfers the power receiving state of the power receiving device 200 to a non-standby state that does not wait for the start of power supply (step S262).

[0067] On the other hand, in a case where it is determined that the power supply permission notification and the power supply electric power notification are received (step S220: YES), the power receiving side control section 220 controls the power receiving circuit 230, and causes the power receiving state of the power receiving apparatus 200 to shift to the standby state in which the power supply can be performed.

[0068] The non-contact power supply system 1000 according to the sixth embodiment described above functions to have the same effects as the non-contact power supply system 1000 according to the first embodiment. In addition to this, since the power receiving apparatus 200 that receives the power supply non-permission notification shifts from the standby state to the non-standby state, it is possible to suppress the consumed electric power for maintaining the standby state. Thus, it is possible to suppress the electric power consumption of the battery 210, and therefore, it is possible to suppress the power supply frequency, and it is possible to further suppress the total of the power supply electric powers from exceeding the outputtable electric power.

[0069] G. Other Embodiments (G1) In the above-described embodiments, the power receiving apparatus 200 is mounted on the mobile body or the stationary device, but the present disclosure is not limited to this. The power receiving apparatus 200 can be mounted only on the mobile body. The non-contact power supply system 1000 according to this mode also functions to have the same effects as the above-described embodiments.

[0070] (G2) In the above-described embodiments, each power receiving apparatus 200 transmits the power receiving apparatus side information to the power supply electric power suppression section 400 every predetermined time, but the present disclosure is not limited to this. For example, the power supply electric power suppression section 400 can transmit a notification of requesting transmission of the power receiving apparatus side information at an arbitrary timing to all of the power receiving apparatuses 200, and among the power receiving apparatuses 200 that receive the notification, only the power receiving apparatuses 200 that are located within the power transmission region transmit the power receiving apparatus side information to the power supply electric power suppression section 400. The non-contact power supply system 1000 according to this mode also functions to have the same effects as the above-described embodiments. In addition to this, since the power receiving apparatuses 200 that are not located within the power transmission region do not need to transmit the power receiving apparatus side information, it is possible to suppress the electric power consumption for the transmission of the information.

[0071] (G3) In the above embodiment, the power supply power suppression section 400 takes the power receiving apparatuses 200 located within the power transmission region among the plurality of power receiving apparatuses 200 as the notification target power receiving apparatuses, but the present disclosure is not limited thereto. Among the notification target power receiving apparatuses, the power receiving apparatuses 200 located outside the power transmission region can also be included. For example, in a case where the notification target power receiving apparatuses are located outside the power transmission region, the power supply power suppression section 400 can also transmit the power supply disallowed notification to the notification target power receiving apparatuses. In addition, in a case where the requested power supply power of each of the power receiving apparatuses 200 located within the power transmission region is lower than the power outputtable power and there is a margin for power supply to other power receiving apparatuses 200, the power supply power suppression section 400 can also transmit the power supply allowed notification and the power supply power notification to the power receiving apparatus 200 located outside the power transmission region. The non-contact power supply system 1000 of this mode also has the same effects as the above embodiment.

[0072] (G4) In the above embodiment, the power supply power suppression section 400 transmits the power supply allowed notification and the power supply power notification to the power supply allowed power receiving apparatus, but the present disclosure is not limited thereto. The power supply power suppression section 400 can also transmit only the power supply allowed notification to the power supply allowed power receiving apparatus, and the power supply allowed power receiving apparatus that has received the power supply allowed notification can perform power supply at the power supply power set in advance. The non-contact power supply system 1000 of this mode also has the same effects as the above embodiment.

[0073] (G5) In the above embodiment, the power transmission system 100 has a plurality of power transmission circuits 110 connected in parallel with respect to the system power supply PS, each of the power transmission circuits 110 has the noise filter 111, the PFC circuit 112, the inverter 113, and the high-frequency filter 114, but the present disclosure is not limited thereto. For example, the power transmission system 100 can have a plurality of power transmission circuits 110 connected in series with respect to the system power supply PS. Figure 10As shown, the power transmission system 100A can also include a power transmission circuit 110A instead of the power transmission circuit 110, the power transmission circuit 110A having a direct-current power circuit 116 connected to the system power source PS and a plurality of alternating-current power circuits 118 connected in parallel with each other with respect to the direct-current power circuit 116. The direct-current power circuit 116 has the noise filter 111 and the PFC circuit 112, converts alternating-current power supplied from the system power source PS into direct-current power and smoothes the direct-current power to output. The direct-current power output from the direct-current power circuit 116 is supplied to each of the alternating-current power circuits 118 via a direct-current power transmission bus BSdc. The alternating-current power circuit 118 has the inverter 113 and the high-frequency filter 114, converts the direct-current power supplied from the direct-current power circuit 116 into high-frequency alternating-current power and outputs. The high-frequency alternating-current power output from the alternating-current power circuit 118 is supplied to each of the power transmission devices 120 via an alternating-current power transmission bus BSac. In addition, the alternating-current power circuit 118 can be connected only one with respect to the direct-current power circuit 116, or three or more can be connected in parallel with each other. According to the non-contact power feeding system 1000 having the power transmission system 100A of this type, by providing the alternating-current power circuit 118 near the power transmission device 120, it is possible to shorten the length of the alternating-current power transmission bus BSac, which is more expensive than the direct-current power transmission bus BSdc, and thus it is possible to suppress the introduction cost of the non-contact power feeding system 1000.

[0074] (G6) In the above-described embodiment, the power transmission device 120 has the impedance variable element 20, but the present disclosure is not limited thereto. As shown in FIG. 10, the power transmission device can also be configured as a power transmission device 120A having an impedance variable element 20A instead of the impedance variable element 20. Figure 11 As shown, the power transmission device can also be configured as the power transmission device 120A having the impedance variable element 20A instead of the impedance variable element 20. The impedance variable element 20A configures a primary-side resonance circuit 10A together with the primary-side coil Ls. The impedance variable element 20A has a capacitor C13 and a switch SW2 connected in parallel with each other with respect to the primary-side coil Ls, and a switch SW3 connected in series with the primary-side coil Ls between the power transmission circuit 110 and the switch SW2. In the impedance variable element 20A configured in this way, the primary-side detection circuit 30 can also switch the resonance state of the primary-side resonance circuit 10A by switching the on / off of the switches SW2 and SW3. The non-contact power feeding system 1000A including the power transmission system 100A having the power transmission device 120A also has the same effects as the above-described embodiment.

[0075] In addition, as shown in FIG. 11, the power transmission device can also be configured as a power transmission device 120B having an impedance variable element 20B instead of the impedance variable element 20. Figure 12As shown, the power transmitting device can be configured to have the third-side resonant circuit 13 in addition to the configuration of the power transmitting device 120. The third-side resonant circuit 13 is a closed circuit having the third-side coil Ls31, the switch SW4, the capacitor C31, and the capacitor C32. The switch SW4 and the capacitor C31 are connected in series with each other, and the third-side coil Ls31, the capacitor C32, the switch SW4, and the capacitor C31 connected in series with each other are connected in parallel with each other. The third-side resonant circuit 13 is configured such that the third-side coil Ls31 is magnetically coupled to the primary-side coil Ls of the primary-side resonant circuit 10 and the secondary-side coil Lr of the secondary-side resonant circuit 240. In the power transmitting device 120B configured in this way, the primary-side detection circuit 30 can switch the resonance state of the primary-side resonant circuit 10A and the third-side resonant circuit 13 by switching the on / off of the switch SW1 and the switch SW4. The non-contact power feeding system 1000B including the power transmitting system 100B having the power transmitting device 120B also has the same effects as the above-described embodiment. In a non-contact power feeding system including a third-side resonant circuit having a configuration without the capacitor C31 instead of the third-side resonant circuit 13, the same effects are also obtained.

[0076] (G7) In the above-described embodiment, the power feeding power suppression section 400 controls the power receiving device 200 in such a way that the total of the power feeding powers does not exceed the power output by using the power output set in advance, but the present disclosure is not limited to this. The power feeding power suppression section 400 can acquire information indicating the current power output of the system power supply PS and each power transmitting circuit 110 from the system power supply PS and each power transmitting circuit 110, respectively, and control the power receiving device 200 using the information. According to the power feeding power suppression section 400 configured in this way, even in a case where the power output of the system power supply PS and each power transmitting circuit 110 varies due to power feeding by another system power supply used in a factory or a warehouse, for example, the power receiving device 200 can be controlled in such a way that the total of the power feeding powers does not exceed the current power output.

[0077] (G8) In the above-described second embodiment, the power feeding power suppression section 400 suppresses the power feeding power and performs power feeding also with respect to the notified power receiving device other than the priority power receiving device, but the present disclosure is not limited to this. The power feeding power suppression section 400 can perform power feeding only with respect to the priority power receiving device. The non-contact power feeding system 1000 configured in this way can also preferentially perform power feeding with respect to the power receiving device 200 for which the necessity of power feeding is high, and can suppress the equipment in which the power receiving device 200 is installed from stopping operating because of the inability to perform power feeding.

[0078] The power supply power suppression section 400 and the method thereof according to the present disclosure can also be implemented by a special-purpose computer provided by a processor programmed to execute one or more functions embodied by a computer program, or a special-purpose computer provided by a processor composed of one or more special-purpose hardware logic circuits. Alternatively, the power supply power suppression section 400 and the method thereof according to the present disclosure can be implemented by a special-purpose computer provided by a combination of a processor programmed to execute one or more functions and a processor composed of one or more hardware logic circuits. Further, the computer program can be stored in a computer-readable non-transitory tangible recording medium as instructions to be executed by a computer.

[0079] The present disclosure is not limited to the above-described embodiments and can be implemented by various structures without departing from the scope of the above-described gist. For example, the technical features in each of the embodiments corresponding to the technical features in the modes described in the summary of the application can be appropriately replaced or combined to solve part or all of the above-described technical problems or achieve part or all of the above-described effects. Further, the above-described technical features can be appropriately deleted as long as they are not described as essential structures in the present specification. (Embodiment 1) A non-contact power supply system (1000, 1000A, 1000B) includes: A power transmission circuit (110, 110A) that receives power supply from a system power supply (PS) and performs supply of high-frequency AC power of a predetermined operation frequency; A plurality of power transmission devices (120, 120A, 120B) that are connected in parallel with respect to the power transmission circuit and are capable of non-contact power transmission; A plurality of power receiving devices (200) that are capable of receiving power supply in a non-contact manner from the power transmission devices when positioned at any position within a power transmission region capable of power transmission by each of the power transmission devices; and A power supply power suppression section (400) that controls each of the power receiving devices such that the total of the power supply requested from the plurality of power receiving devices does not exceed the power that the system power supply and the power transmission circuit are capable of continuously supplying, i.e., the power that can be output, Each of the power receiving devices transmits power receiving device-side information indicating an operating condition of the power receiving device to the power supply power suppression section, The power supply power suppression section controls each of the power receiving devices using the power receiving device-side information. (Embodiment 2) In the non-contact power feeding system described in Mode 1, The plurality of power feeding devices each include a primary-side resonance circuit (10, 10A) having a primary-side coil (Ls) and primary-side capacitors (C11, C12, C13), The plurality of power receiving devices each include: a secondary-side resonance circuit (240) having a secondary-side coil (Lr) magnetically coupled to the primary-side coil and a secondary-side capacitor (Cr); a power receiving circuit (230) that rectifies and converts AC power output from the secondary-side resonance circuit into DC power; a power receiving-side control section (220) that controls the power receiving circuit; and a load device (210) that is supplied with the DC power. (Mode 3) In the non-contact power feeding system described in Mode 1 or Mode 2, Each of the power receiving devices has a battery (210), and as the power receiving device-side information, transmits information including at least one of position information of the power receiving device, information indicating whether or not the power receiving device is located within the power feeding region, SOC of the battery, remaining power amount of the battery, current power feeding power, and current consumed power, to the power feeding power suppression section, The power feeding power suppression section uses the power receiving device-side information to perform at least either of the following two operations for each of the power receiving devices, i.e., the notified power receiving devices, of at least some of the plurality of power receiving devices: transmits a power feeding permission notification that notifies of permission of power feeding, or a power feeding non-permission notification that notifies of non-permission of power feeding; and transmits a power feeding power notification that notifies of power feeding power, i.e., the power feeding power that is permitted, The notified power receiving devices start or continue power feeding when at least a predetermined power feeding condition including reception of the power feeding permission notification is satisfied, and stand by or stop power feeding when the power feeding non-permission notification is received, When the power feeding power notification is received, power feeding is performed at the notified power feeding power. (Mode 4) In the non-contact power feeding system described in Mode 3, The power feeding condition further includes a condition that a predetermined action is in execution for each of the power receiving devices. (Mode 5) In the non-contact power feeding system described in Mode 3 or Mode 4, As the power receiving device side information, each of the power receiving devices transmits information including at least one of an SOC of the battery, a remaining power amount of the battery, and a current consumption power to the power feeding power suppression section, The power feeding power suppression section determines, using the power receiving device side information, a priority power receiving device which is a notification target power receiving device that is preferentially allowed to be fed power among the plurality of notification target power receiving devices, and preferentially transmits the power feeding permission notification to the priority power receiving device. (Embodiment 6) In the non-contact power feeding system according to any one of Embodiments 3 to 5, As the power receiving device side information, each of the power receiving devices transmits information including at least one of an SOC of the battery, a remaining power amount of the battery, and a current consumption power to the power feeding power suppression section, The power feeding power suppression section determines, using the power receiving device side information, a priority power receiving device which is a notification target power receiving device that is preferentially allowed to be fed power among the plurality of notification target power receiving devices, and transmits, to the notification target power receiving devices other than the priority power receiving device among the plurality of notification target power receiving devices, a power feeding power notification of a power feeding permission power after suppression with respect to the power feeding permission power notified to the priority power receiving device. (Embodiment 7) In the non-contact power feeding system according to Embodiment 3 or 4, As the power receiving device side information, each of the power receiving devices transmits information including at least one of an SOC of the battery to the power feeding power suppression section, The power feeding power suppression section determines, using the power receiving device side information, a maximum power receiving device which is a notification target power receiving device capable of performing power feeding based on an upper limit power feeding power of the power feeding device among the plurality of notification target power receiving devices, and notifies the power feeding permission notification only to the maximum power receiving device. (Embodiment 8) In the non-contact power feeding system according to any one of Embodiments 3 to 7, The notification target power receiving device which receives the power feeding non-permission notification among the notification target power receiving devices shifts from a state capable of immediately performing power feeding, i.e., a standby state, to a non-standby state in which power feeding is not immediately started. (Embodiment 9) In the non-contact power feeding system according to any one of Embodiments 3 to 8, At least a part of the plurality of power receiving devices is the power receiving device mounted on the moving body (202), i.e., a mobile power receiving device, The notification target power receiving device among the plurality of notification target power receiving devices that is the mobile power receiving device retreats from the power transmission region in a case where the power transmission prohibition notification is received. (Mode 10) In the non-contact power feeding system according to any one of Modes 3 to 9, The plurality of power receiving devices include a stationary power receiving device and a mobile power receiving device, the stationary power receiving device being the power receiving device attached to a stationary apparatus that is fixed and disposed in the power transmission region, and the mobile power receiving device being the power receiving device attached to a mobile body, The power feeding power suppression section preferentially transmits the power feeding permission notification to the mobile power receiving device in a case where the mobile power receiving device is located in the power transmission region. (Mode 11) In the non-contact power feeding system according to any one of Modes 1 to 10, The power transmission circuit includes: a direct current power circuit (116) that converts alternating current power supplied from a system power source into direct current power; a direct current power transmission bus (BSdc) that is connected to the direct current power circuit and receives direct current power from the direct current power circuit; an alternating current power circuit (118) that is connected to the direct current power transmission bus and converts direct current power supplied from the direct current power transmission bus into the high frequency alternating current power; and an alternating current power transmission bus (BSac) that is connected to the alternating current power circuit and receives the high frequency alternating current power from the alternating current power circuit, The plurality of power transmission devices are connected in parallel to the alternating current power circuit via the alternating current power transmission bus. (Mode 12) A computer program for controlling a non-contact power feeding system, The non-contact power feeding system includes: a power transmission circuit that receives power supply from a system power source and performs supply of high frequency alternating current power of a predetermined action frequency; a plurality of power transmission devices that are connected in parallel to each other with respect to the power transmission circuit and are capable of non-contact power feeding; and a plurality of power receiving devices that are capable of receiving power feeding in a non-contact manner from the power transmission devices when located at any position in a power transmission region in which power transmission can be performed by each of the power transmission devices, The above computer program uses power receiver-side information indicating the operating state of each of the above power receivers to cause the computer to implement a function of controlling each of the above power receivers so that the total of the power supply requested from the above plurality of power receivers does not exceed the power, i.e., the power that can be output, that the above system power supply and the above power transmission circuit can continuously supply. (Manner 13) A power receiver that receives power supply from at least some of a plurality of power transmission devices in a non-contact manner, The above plurality of power transmission devices are connected in parallel with each other with respect to a power transmission circuit that receives power supply from a system power supply and performs supply of high-frequency alternating current power of a predetermined operation frequency, and are capable of non-contact power supply, The above power receiver receives power supply so that the total of the power supply requested from a plurality of power receivers including the above power receiver does not exceed the power, i.e., the power that can be output, that the above system power supply and the above power transmission circuit can continuously supply. (Manner 14) A power transmission device that supplies power to a power receiver in a non-contact manner, The above power transmission device is connected in parallel with other power transmission devices with respect to a power transmission circuit that receives power supply from a system power supply and performs supply of high-frequency alternating current power of a predetermined operation frequency, The above power receiver receives power supply so that the total of the power supply requested from a plurality of power receivers including the above power receiver does not exceed the power, i.e., the power that can be output, that the above system power supply and the above power transmission circuit can continuously supply.

Claims

1. A contactless power supply system, wherein the contactless power supply system (1000, 1000A, 1000B) comprises: The power supply circuit (110, 110A) receives power from the system power supply (PS) and performs a high-frequency AC power supply with a predetermined operating frequency. Multiple power supply devices (120, 120A, 120B) are connected in parallel with each other relative to the power supply circuit and are capable of providing contactless power supply. Multiple power receiving devices (200) are capable of receiving power from the power transmitting devices in a non-contact manner when located at any position within a power transmission area where power can be transmitted by each of the power transmitting devices. as well as The power supply suppression unit (400) controls each of the power receiving devices to ensure that the total power requested from the plurality of power receiving devices does not exceed the power that the system power supply and the power transmission circuit can continuously supply. Each of the power receiving devices sends information indicating the operating status of the power receiving device, i.e., power receiving device-side information, to the power supply suppression unit. The power supply suppression unit uses the information from the power receiving device side to control each of the power receiving devices.

2. The contactless power supply system as described in claim 1, characterized in that, The plurality of power transmission devices each include a primary-side resonant circuit (10, 10A), the primary-side resonant circuit having a primary-side coil (Ls) and a primary-side capacitor (C11, C12, C13). The plurality of power receiving devices each include: A secondary resonant circuit (240) having a secondary coil (Lr) and a secondary capacitor (Cr) magnetically coupled to the primary coil; The power receiving circuit (230) rectifies and converts the AC power output from the secondary resonant circuit into DC power. Power receiving side control unit (220), which controls the power receiving circuit; and Load device (210), which is supplied with the DC power.

3. The contactless power supply system as described in claim 1, characterized in that, Each of the power receiving devices has a battery (210), and as power receiving device-side information, it sends information to the power supply suppression unit including at least one of the following: location information of the power receiving device, information indicating whether the power receiving device is located within the power supply area, the state of charge (SOC) of the battery, the remaining power of the battery, the current power supply, and the current power consumption. The power supply suppression unit, using the information from the power receiving device side, performs at least one of the following two operations on each of at least a portion of the power receiving devices, i.e., each of the power receiving devices to be notified: Sending a power supply permission notification that allows power supply, or a power supply disallowance notification that does not allow power supply; and Send a power supply notification, which notifies the availability of power, i.e., permitted power supply. The receiving device to which the notification is received will start or continue supplying power when predetermined power supply conditions are met, and will go into standby or stop supplying power when the power supply is not permitted notification is received. The power supply conditions include at least receiving the power supply permitted notification. Upon receiving the power supply notification, power is supplied using the notified permitted power supply.

4. The contactless power supply system as described in claim 3, characterized in that, The power supply conditions also include the condition that a pre-determined action is being performed for each of the powered devices.

5. The contactless power supply system as described in claim 3 or 4, characterized in that, As information for the power receiving device, each power receiving device sends information including at least one of the battery's SOC, the battery's remaining power, and the current power consumption to the power supply suppression unit. The power supply suppression unit uses the information from the power receiving device side to determine the priority power receiving device and sends the power supply permission notification to the priority power receiving device first. The priority power receiving device is the power receiving device that is given priority permission to supply power among a plurality of notification target power receiving devices.

6. The contactless power supply system as described in claim 3 or 4, characterized in that, As information for the power receiving device, each power receiving device sends information including at least one of the battery's SOC, the battery's remaining power, and the current power consumption to the power supply suppression unit. The power supply suppression unit uses the information from the power receiving device side to determine the power receiving device that is given priority in being allowed to receive power among the multiple power receiving devices to receive power, namely the priority power receiving device, and sends a power supply notification to the power receiving device that is not the priority power receiving device to receive power that is allowed to receive power, wherein the allowed power supply is suppressed relative to the allowed power supply notification to the priority power receiving device.

7. The contactless power supply system as described in claim 3 or 4, characterized in that, As information for the power receiving device, each power receiving device sends information including at least the SOC of the battery to the power supply suppression unit. The power supply suppression unit uses the information from the power receiving device side to determine the power receiving device among the multiple power receiving devices that can perform power supply based on the upper limit of the power supply of the power supply device, namely the maximum power receiving device, and only notifies the power supply permission notification to the maximum power receiving device.

8. The contactless power supply system as described in claim 3 or 4, characterized in that, The power receiving device that receives the notification that power supply is not allowed will switch from a standby state (where it can immediately start supplying power) to a non-standby state (where it does not immediately start supplying power).

9. The contactless power supply system as described in claim 3 or 4, characterized in that, At least a portion of the plurality of power receiving devices are power receiving devices installed on the mobile body (202), i.e., mobile power receiving devices. When a mobile power receiving device among the plurality of power receiving devices receiving the notification receives a notification that power supply is not permitted, it withdraws from the power supply area.

10. The contactless power supply system as described in claim 3 or 4, characterized in that, The plurality of power receiving devices includes fixed power receiving devices and mobile power receiving devices. The fixed power receiving devices are those installed on fixed equipment located in the power transmission area, and the mobile power receiving devices are those installed on a moving body. When the mobile power receiving device is located within the power supply area, the power supply suppression unit prioritizes sending the power supply permission notification to the mobile power receiving device.

11. The contactless power supply system as described in any one of claims 1 to 4, characterized in that, The power transmission circuit includes: A DC power circuit (116) converts the AC power supplied from the system power source into DC power; A direct current transmission bus (BSdc) is connected to the direct current power circuit and receives direct current power from the direct current power circuit; An AC power circuit (118) is connected to the DC power transmission bus and converts the DC power supplied from the DC power transmission bus into the high-frequency AC power; and An AC power supply bus (BSac) is connected to the AC power circuit and receives the high-frequency AC power from the AC power circuit. The plurality of power transmission devices are connected in parallel with respect to the AC power circuit via the AC power transmission bus.

12. A computer program for controlling a contactless power supply system. The contactless power supply system includes: A power transmission circuit that receives power from the system power supply and performs high-frequency AC power supply at a predetermined operating frequency; Multiple power supply devices are connected in parallel with respect to the power supply circuit and are capable of supplying power without contact. as well as Multiple power receiving devices, which, when located at any position within a power transmission area where power can be supplied by each of the power transmitting devices, can receive power from the power transmitting devices in a non-contact manner. The computer program uses information representing the operating status of each of the power receiving devices, i.e., power receiving device side information, to enable the computer to control each of the power receiving devices, so that the total power requested from the multiple power receiving devices does not exceed the power that the system power supply and the power transmission circuit can continuously supply, i.e., power can be output.

13. A power receiving device that receives power from at least a portion of a plurality of power transmitting devices in a non-contact manner. The multiple power supply devices receive power from the system power supply and are connected in parallel with each other relative to the power supply circuit that supplies high-frequency AC power at a predetermined operating frequency, and are capable of contactless power supply. The receiving device receives power so that the total power requested from multiple receiving devices, including the receiving device, does not exceed the power that the system power supply and the power transmission circuit can continuously supply, i.e., power can be output.

14. A power transmission device that supplies power to a power receiving device in a non-contact manner. The power transmission device receives power from the system power supply and operates in parallel with other power transmission devices via a high-frequency AC power supply circuit that operates at a predetermined frequency. The receiving device receives power so that the total power requested from multiple receiving devices, including the receiving device, does not exceed the power that the system power supply and the power transmission circuit can continuously supply, i.e., power can be output.

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