Wireless power supply system

Abstract

The invention provides a wireless power supply system and a wireless power supply control method, which do not influence the safety guarantee of a manufacturer of an electric moving body and can be additionally used subsequently. A wireless power supply system is provided with: a power receiving coil attached to an electric moving body; a connector connected to a charging port for wired power supply of the electric moving body; and a power conversion unit that is connected to the power receiving coil and the connector, and that converts the power received by the power receiving coil so that the power can be supplied to a battery mounted on the electric moving body via the charging port.

Description

Technical Field

[0001] This invention relates to a wireless power supply system that can be subsequently used additionally. Background Technology

[0002] Electric mobility devices that use high-capacity lithium-ion batteries as drive batteries and utilize the electricity stored in the drive batteries to power electric motors are becoming increasingly common. These battery-powered electric mobility devices include not only electric cars, but also unmanned transport vehicles, forklifts, drones and other flying vehicles, and electric-propelled boats and other waterborne vehicles. As a method of powering the drive batteries of these electric mobility devices, wireless power supply systems that provide power wirelessly without cables are becoming practical.

[0003] In wired power supply systems, the advantage is that they can supply power at high speed. On the other hand, in wireless power supply, the advantage is that as long as the vehicle is parked in a location where the power supply coil can be aligned, power can be supplied without the user's work site.

[0004] Users expect electric mobility devices to be able to be charged both wired and wirelessly, and to be able to choose the type of power supply available.

[0005] Various solutions have been proposed to address both wired and wireless power supply methods for powering batteries mounted on electric vehicles. Patent Document 1 discloses an electric vehicle that allows simultaneous operation of wired and wireless power supply, thereby enabling large-scale power transfer. Patent Document 2 shows a device comprising a connector for wired power supply and a receiving coil for wireless power supply, with a switch for switching between wired and wireless power supply.

[0006] Prior art literature

[0007] Patent documents

[0008] Patent Document 1: JP 2023-028028

[0009] Patent Document 2: JP Patent No. 2019-531680 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] As disclosed in Patent Documents 1 and 2, if both wired and wireless power supply are provided from the time of manufacture of the electric mobile body, the safety guarantee of the electric mobile body for passengers can be implemented by the manufacturer. However, even if it is technically possible to add a wireless power supply system to an electric mobile body that only has wired power supply, if it requires modification of the mobile body's built-in control equipment and electrical system, the safety guarantee of the electric mobile body will be lost.

[0012] The purpose of this disclosure is to provide a wireless power supply system that can be subsequently used without affecting the safety guarantees of the manufacturer of the electric mobile device.

[0013] Methods for solving problems

[0014] One embodiment of the wireless power supply system disclosed herein includes: a receiving coil mounted on an electric mobile body; a connector connected to a wired power supply socket of the electric mobile body; and a power conversion unit connected to the receiving coil and the connector, which converts the power received by the receiving coil into power that can be supplied to a battery mounted on the electric mobile body via the socket.

[0015] In the wireless power supply system disclosed herein, when the receiving coil is mounted on the outer surface of the electric mobile body, the external dimensions of the receiving coil's outer casing are set within the protruding dimensions specified in the safety standards of the electric mobile body, and the total weight of the receiving coil, connector, and power conversion unit can be set within the weight specified in the safety standards of the electric mobile body. Safety standards are established by various countries, for example...

[0016] (1) United States: Federal Motor Vehicle Safety Standards

[0017] (2) Europe: EEC Directive (European Economic Community Directive)

[0018] (3) China: National Standards of the People's Republic of China

[0019] (4) Canada: Canada Motor Vehicle Safety Standards, etc., have different values ​​depending on the country where the electric vehicle is used.

[0020] Therefore, since even when equipping automotive parts, the dimensions are within the range specified as not requiring structural or other changes for inspection, there is no need to re-inspect the safety of the electric moving body.

[0021] The effects of the invention

[0022] According to this disclosure, it does not affect the safety warranty of the manufacturer of the electric mobile body, and can be used subsequently. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the wireless power supply system according to the first embodiment.

[0024] Figure 2 This is a block diagram showing the structure of the wireless power supply system according to the first embodiment.

[0025] Figure 3 This is a flowchart illustrating an example of power supply processing based on a wireless power supply system.

[0026] Figure 4 This is a block diagram showing the structure of the wireless power supply system according to the second embodiment.

[0027] Figure 5 This is a flowchart illustrating an example of power supply processing based on the wireless power supply system of the second embodiment.

[0028] Figure 6 This is a flowchart illustrating an example of power supply processing based on the wireless power supply system of the second embodiment.

[0029] Figure 7 This is a block diagram showing the structure of the wireless power supply system according to the third embodiment.

[0030] Figure 8 This is a flowchart illustrating an example of power supply processing based on the wireless power supply system of the third embodiment.

[0031] Figure 9 This is a flowchart illustrating an example of power supply processing based on the wireless power supply system of the third embodiment. Detailed Implementation

[0032] This disclosure will be described in detail with reference to the accompanying drawings, which illustrate embodiments thereof.

[0033] (First Embodiment)

[0034] Figure 1 This is a schematic diagram of the wireless power supply system 100 according to the first embodiment. The wireless power supply system 100 is installed in and used on an electric mobile vehicle (e.g., an electric car) M having a charging port R (also called a socket) for wired power supply. The wireless power supply system 100 is used in an electric mobile vehicle M that does not require wireless power supply. Figure 1 In the following description, the electric mobile body M is illustrated using an EV (Electric Vehicle) truck as an example, but it is not limited to this. It can also be an electric vehicle, an unmanned delivery vehicle, a forklift, a robot, a so-called drone or other flying vehicle, an electric propulsion boat or other waterborne mobile body.

[0035] The wireless power supply system 100 includes: a connector (plug) 12 that connects to the charging port R of the electric mobile body M; a receiving coil 13 mounted on the rear surface of the electric mobile body M; and a main body 11 connected between the connector 12 and the receiving coil 13. The main body 11 is as follows... Figure 1 As shown, an outer cover 130, 14 is provided on the side of the electrically moving body M, for example, the receiving coil 13, the main body 11 and the connector 12.

[0036] The location where the receiving coil 13 is installed is not limited to the rear of the vehicle body; it can also be on the side, the bottom of the vehicle body, or the inner side of the vehicle body. The external dimension of the outer casing 130 of the receiving coil 13 in the thickness direction is within the size that can protrude as specified in safety standards. For example, the external dimension of the outer casing 130 in the coil axis direction is specified relative to the vehicle body of the electric mobile body M as a size (±3 cm) that does not require structural or other change inspections even when equipped with automotive parts. The external dimension (thickness) of the outer casing 130 of the receiving coil 13 in the coil axis direction can be set to 2 cm or less so that it can be installed on the outer side of the side of the electric mobile body M. In addition, the receiving coil 13 may not be installed on the outer surface of the vehicle body, but may be installed on the inner side facing outward of the structure (e.g., a door) forming the outer shell of the electric mobile body M. In this case, although the power supply distance between the receiving coil 13 and the power supply coil becomes longer, since the receiving coil 13 will not protrude to the outer side of the vehicle body, there is no limitation on the size.

[0037] The specific values ​​mentioned above, which are prominent dimensions specified in safety standards, can be modified according to the safety standards of different countries. Similarly, the regulations concerning the weight of the electrically powered moving body M, which will be discussed later, can also be modified according to the safety standards of different countries or regions.

[0038] The main body 11 can be located either inside or outside the body of the electric mobile unit M. The main body 11 can be positioned in the cargo area. Since the receiving coil 13, mounted on the outside of the body, is connected to the connector 12 that engages with the charging port R, which partially protrudes to the outside, it can also be configured as follows: Figure 1 It is installed on the side of the vehicle body as shown. When the main body 11 is located on the outer side, the outer cover 14 of the main body 11 is preferably set to a size that can protrude as specified in the safety standard, that is, less than 2 cm.

[0039] Connector 12 is always connected to the charging port R. Connector 12 preferably has a shape that allows the outer cover of the charging port R to be closed when connector 12 is connected.

[0040] like Figure 1 As shown, the overall weight of the wireless power supply system 100 is expected to correspond to the size of the electric mobile body M, and be within 50 kg (for light vehicles and small vehicles) or 100 kg (for ordinary vehicles and large special vehicles) of the equipment state specified in the safety standards, so that even if the main body 11, connector 12, and receiving coil 13 are installed on the electric mobile body M that should not be wirelessly powered, a safety re-evaluation is not required.

[0041] The mounting position of the receiving coil 13 can be determined according to the height of the power supply device (not shown). The power supply device comprises a power supply coil and a communication unit, wherein the power supply coil has an axis in the horizontal direction so that it is aligned with the receiving coil 13 when the electric mobile body M, which is an EV truck, is parked, and the communication unit can communicate with the control unit (charging control unit) 110 (see reference) provided in the main body 11. Figure 2 Communication. The power transmission device may be constructed by including a power transmission coil having a vertical axis and being buried in the ground.

[0042] Figure 2 This is a block diagram showing the structure of the wireless power supply system 100 according to the first embodiment. The wireless power supply system 100 includes a main body 11, a connector 12, and a receiving coil 13.

[0043] The connector 12, which connects to the charging port R of the electric mobile vehicle M, includes: a power line PL1 for transmitting power; a signal line SL1 for transmitting and receiving signals between the on-board charging control device and the power supply device; and a signal line SL2 for transmitting and receiving signals between the various mechanisms of the connector 12 and the control unit 110. The connector 12 includes: a cylindrical socket 121 that engages with the charging port R; and a pin (locking portion) 122 that protrudes from the outer peripheral surface of the socket 121. The connector 12 includes: a locking mechanism 123 for locking / unlocking the pin 122; and a retraction mechanism 124 forcibly retracting the pin 122 into the inside of the socket 121. The pin 122 can be protruded from the socket 121 by a compression spring located in a recess at a specific location within the socket 121. The retraction mechanism 124 initially blocks the opening of the recess in the socket 121 and retracts the socket 121 into its interior state. The retraction mechanism 124 opens the opening of the recess in the socket 121 based on a signal received from the control unit 110 via signal line SL2, allowing the pin 122 to protrude. The retraction mechanism 124 is not limited to... Figure 2The structure shown can be modified as long as it functions to prevent the locking portion, such as the pin 122, from engaging with the charging port R. For example, it could also include a solenoid switch that pulls the pin 122 into the inside of the socket 121.

[0044] Furthermore, the retraction mechanism 124 can also be configured to retract part or all of the socket 121 from the charging port R. Moreover, the locking portion that engages the connector 12 with the charging port R is not limited to the pin 122 provided in the socket 121, but can also be the pin provided in the charging port R. In this case, for example, the engagement portion (recess) where the connector 12 engages with the pin of the charging port R is provided on the outer periphery of the socket 121. In this case, the retraction mechanism 124 can be implemented as a mechanism that pushes the pin out from the engagement portion toward the charging port R, or it can be configured to push out the pin and retract part or all of the socket 121 from the charging port R.

[0045] The main body 11 includes a control unit 110 and a power conversion unit 111. The power conversion unit 111 is connected to the receiving coil 13 via power line PL2. The power conversion unit 111 converts the high-frequency power received by the receiving coil 13 into DC current using a rectifier circuit 112, thus smoothing it out. Based on the control from the control unit 110, the power conversion unit 111 converts the DC current output from the rectifier circuit 112 into power with DC frequency and voltage required from the electric mobile body M via an inverter (or converter) 113, and outputs it from the power line PL1 of the connector 12.

[0046] The control unit 110 is connected to the power conversion unit 111 within the main body 11. The control unit 110 controls the switching on / off of the inverter 113 and controls the output from the inverter 113. Based on information exchanged with the power supply device, the control unit 110 communicates with the on-board charging control device via signal line SL1 in accordance with the prescribed communication requirements for power supply. Specifically, the control unit 110 exchanges information such as charging rate, charging voltage, and charging current with the on-board charging control device, for example, via CHAdeMO (registered trademark) or NACS (North American Charging Standard), to control the power supply from the power supply device to the battery mounted on the electric vehicle M.

[0047] The control unit 110 internally includes a processor 114, a memory 115, and a wireless communication unit 116. The control unit 110 may include a power storage unit capable of powering itself and the wireless communication unit 116. The processor 114 uses a CPU (Central Processing Unit) or an MPU (Micro Processing Unit), etc. The processor 114 reads the control program P1 stored in the memory 115 to perform charging-related control processing.

[0048] The memory 115 uses non-volatile memory. The control program P1 is stored in the memory 115. The control program P1 is programmed into the memory 115 during the manufacture of the control unit 110. The control program P1 may also be a program that the processor 114 reads from a recording medium that can be read by a computer (processor) and stores in the memory 115.

[0049] The wireless communication unit 116 enables wireless communication with a power supply device (not shown). The wireless communication unit 116 communicates, for example, via WiFi (registered trademark). The wireless communication unit 116 may also communicate via Bluetooth (registered trademark). The wireless communication standard of the wireless communication unit 116 is not limited to WiFi or Bluetooth, but short-range wireless communication is preferred.

[0050] The owner of the electric mobile vehicle M installs the wireless power supply system 100 configured as follows on the electric mobile vehicle M. The owner connects the connector 12 to the charging port R of the electric mobile vehicle M and closes the outer cover of the charging port R. When the wireless power supply system 100 is not receiving power and is not activated, the retraction mechanism 124 prevents the pin 122 from engaging with the locking part provided on the inner surface of the charging port R. This avoids the on-board charging control device from determining that the charging plug is still inserted in the charging port R.

[0051] The wireless power supply system 100 installed in this way achieves wireless power supply as follows. Figure 3 This is a flowchart illustrating an example of the power supply process of the wireless power supply system 100.

[0052] The processor 114 of the control unit 110 determines whether power can be received through the receiving coil 13 (step S101). In step S101, the processor 114 can determine whether power can be received based on whether a charging control instruction is received from the on-board charging control device via the signal line SL1. The on-board charging control device can initiate charging based on a charging start operation received from the driver in the driver's seat of the parked electric mobile vehicle M, or a OFF operation of the start switch of the electric mobile vehicle M (e.g., an ignition switch OFF operation installed in the electric mobile vehicle M). The control unit 110 can detect this situation and initiate the following process.

[0053] In step S101, the processor 114 may be activated, for example, by the on / off state of a built-in switch (not shown), determining that power reception can begin. In this example, the driver or operator who is to provide wireless power turns on the switch (not shown) of the wireless power supply system 100 while the electric vehicle M is parked in a position where power can be supplied.

[0054] In step S101, the processor 114 may also automatically detect whether the device is stopped at a power supply location, based on whether it can receive a small electromagnetic wave emitted from the power supply coil of the power supply device via the receiving coil 13, and determine that it can start. In this example, the control unit 110 has a start-up circuit that connects the power supply from the battery storage unit via a small electromagnetic wave from the power supply coil. The control unit 110 may also have an integrated acceleration sensor, which determines whether power reception can begin only when a stop is confirmed.

[0055] If the processor 114 determines that it cannot start receiving power through the power receiving coil 13 (S101: No), it terminates the process. If a given standby time has elapsed, the process in step S101 is restarted.

[0056] When the processor 114 determines that it can start receiving power through the receiving coil 13 (S101: Yes), it attempts to establish a communication connection with the power transmission device through the wireless communication unit 116 (step S102), and then determines whether communication is possible (step S103). In S103, the processor 114 can send the authentication data (registered vehicle number, serial number of the control unit 110 itself, etc.) stored in the memory 115 to the power transmission device, thereby authenticating the communication counterpart on the power transmission device side.

[0057] If the processor 114 determines that communication has been established and communication is possible (S103: Yes), it receives the retraction mechanism 124 and causes the pin 122 to protrude and lock onto the charging port R, thus locking it (step S104). Through step S104, the processor 114 causes the on-board charging control device to perform the same process as when a wired power supply plug is connected to the charging port R.

[0058] If communication is determined to be impossible in step S103 (S103: No), the processor 114 determines that wireless power supply is impossible and terminates with an error.

[0059] After the latch 122 is locked, the processor 114 outputs a charging preparation signal to the vehicle charging control device via the signal line SL1 (step S105). The processor 114 notifies the power supply device of the power supply start permission via the wireless communication unit 116 (step S106). In wireless power supply, the rise of the output voltage that can be energized by the receiving coil 13 takes longer than that of wired power supply. Therefore, by first granting the power supply start permission to increase the output power (pre-charging), the control unit 110 can control the output from the inverter 113 to keep up with the output rise after step S108.

[0060] If the processor 114 receives a permission signal from the on-board charging control device in response to the charging preparation signal output in step S105 (step S107), it executes a given sequence (charging start processing) with the on-board charging control device following a given protocol for wired power supply (step S108). The given protocol is, for example, CHAdeMO as described above. In step S108, the processor 114 increases the output of the inverter 113 to ensure that processing with the on-board charging control device does not stop.

[0061] Therefore, the processor 114 starts (continues) power supply (step S109). The control unit 110 that starts power supply uses the power that can be received through the receiving coil 13 to store electricity in its own energy storage unit.

[0062] Processor 114 determines whether charging is fully charged and completes charging on the vehicle charging control device side (step S110). In step S110, processor 114 can determine whether it has been notified of termination by the vehicle charging control device. In step S110, processor 114 can determine whether the charging rate obtained from the vehicle charging control device has reached a given rate. In step S110, if it is determined that charging cannot be received through the receiving coil 13, that is, the inverter 113 cannot output the required current and voltage, processor 114 can determine that charging is complete (interrupted). If it is determined that charging is not complete (S110: No), processor 114 returns the process to step S109.

[0063] If charging is determined to be complete (S110: Yes), the processor 114 executes a given sequence (charging completion process) (S111) with the on-board charging control device. The processor 114 releases the lock of the latch 122 (step S112), causing the retraction mechanism 124 to operate to retract the latch 122 (step S113). The processing of step S112 can be included in the given charging completion process sequence. The processor 114 disconnects the wireless communication connection with the power supply device (step S114), ending the process.

[0064] Figure 3 The processing steps shown are an example and are not limited to this. For example, the start of the processing in step S101 can also be initiated by receiving a stop notification from the electric moving body M. Furthermore, as long as the latch 122 is locked in the power supply, the timing for unlocking the latch 122, the operation of the retraction mechanism 124, the containment, etc., can also be other timings.

[0065] Since the pin 122 of connector 12 does not engage with the charging port R after charging is complete, the situation where the on-board charging control device, which determines that the electric vehicle M is plugged in, is avoided. This allows the electric vehicle M to be driven while the wireless power supply system 100 remains installed. In addition, the control unit 110 can also perform processing such as continuously outputting (canceling) a specific signal to the signal line SL1 to prevent the on-board charging control device from determining that the plug is plugged in.

[0066] Thus, by installing the wireless power supply system 100 on the electric mobile vehicle M, wireless power supply can be achieved. The charging control device mounted on the electric mobile vehicle M transmits and receives information from the power supply device and receives power through the same sequence as wired power supply, enabling charging of the vehicle's battery. Therefore, it is not necessary to modify the electrical system of the electric mobile vehicle M to achieve wireless power supply, change the software of the charging control device, or use a switch to switch it. The wireless power supply system 100 is simply mounted on the electric mobile vehicle M, and the increase in weight and size changes are within the range that do not require vehicle inspection. Therefore, wireless power supply can be achieved while maintaining the safety guarantee of the manufacturer of the electric mobile vehicle M. In addition, in the example shown in the first embodiment, when the owner, driver, or power supply operator of the electric mobile vehicle M is using wired power supply, the outer cover of the charging port R can be opened and the connector 12 can be removed, and the plug from the power supply device for wired power supply can be inserted into the charging port R to implement wired power supply.

[0067] (Second Implementation)

[0068] In the second embodiment, a structure is provided in which wired power supply can be performed even when the connector 12 is still inserted into the charging port R. Figure 4This is a block diagram illustrating the structure of the wireless power supply system 300 according to the second embodiment. Structures in the wireless power supply system 300 shown in the second embodiment that are common to the wireless power supply system 100 in the first embodiment are labeled with the same reference numerals, and detailed descriptions are omitted.

[0069] The wireless power supply system 300 of the second embodiment includes a main body 1, a connector 12, and a receiving coil 13. In the wireless power supply system 300, a detection unit 117 is provided between the main body 1 and the connector 12. The detection unit 117 is branched and connected to both a power conversion unit 111 and a wired charging port (wired connector) 118.

[0070] The detection unit 117 includes a first switch 70, which branches the power line PL1 and connects it to either the power conversion unit 111 or the wired charging port 118. The first switch 70 is, for example, a C-contact relay, and in the off state, it is connected to receive power via the wired charging port 118. The first switch 70 is switched on and off by the control unit (switching control unit) 110.

[0071] The detection unit 117 detects whether a wired power supply plug is connected to the wired charging port 118 and outputs the result to the control unit 110.

[0072] The main body 11 is equipped with an output unit such as a display or LED light, and the control unit 110 can output whether it is operating with wireless power supply or wired power supply.

[0073] Figure 5 as well as Figure 6 This is a flowchart illustrating an example of the power supply processing of the wireless power supply system 300 according to the second embodiment. For Figure 5 as well as Figure 6 The processing steps shown in the flowchart are the same as those in the first embodiment. Figure 3 The flowchart shows common processing steps, with the same step numbers labeled and detailed explanations omitted.

[0074] In the second embodiment, if it is determined that communication is possible (S103: Yes), it is determined whether the detection unit 117 has detected that a plug for wired power supply is connected to the wired charging port 118 (step S121).

[0075] If it is determined that no wired power supply plug is detected (S121: No), the processor 114 sets the first switch 70 of the detection unit 117 to be turned on, invalidates the connection to the wired charging port 118 (step S122), and stops and locks the plug 122 (S104).

[0076] In the second embodiment, when charging is completed via wireless power supply (S110: Yes), the processor 114 executes the given charging end sequence (S111). The processor 114 releases the lock of the latch 122 (S112), causing the latch 122 to retract (S113), and after disconnecting the communication connection with the power supply device (S114), it returns the first switch 70 of the detection unit 117 to the off state (step S123), thus ending the process.

[0077] In the second embodiment, if the processor 114 determines in step S121 that a plug for wired power supply has been detected (S121: Yes), it implements wired power supply (step S124) and terminates the process. In this case, the processing of the control unit 110, which is the wireless power supply system 300, ceases.

[0078] If it is determined in step S103 that communication is not possible (S103: No), processor 114 determines whether a wired power supply plug is detected (step S125). If it is determined in step S125 that a wired power supply plug is detected (S125: Yes), the process proceeds to step S124.

[0079] In step S125, regarding the plug for wired power supply, if it is determined that no connection is detected (S125: No), the processor 114 determines that power cannot be supplied and terminates with an error.

[0080] (Third implementation)

[0081] In the third embodiment, a structure is provided in which wired power supply can be performed even when the connector 12 is kept inserted into the charging port R using a method different from that in the second embodiment. Figure 7 This is a block diagram illustrating the structure of the wireless power supply system 100 according to the third embodiment. The same reference numerals are used to denote structures common to the wireless power supply system 100 of the first embodiment, and detailed descriptions are omitted.

[0082] In the first and second embodiments, illustrations and descriptions are omitted, but the signal lines SL1 of connector 12 include, in addition to communication lines for CAN (Controller Area Network) communication or other communications with the on-board charging control device, signal lines SL11, SL12, ... for exchanging information with the on-board charging control device based on a given protocol. One of the multiple signal lines SL11, SL12, ... included in signal line SL1, signal line SL11 is used to confirm the connection between connector 12 and charging port R. The front end inside connector 12 of signal line SL11 is called the connection confirmation terminal T1, which connects to the high potential (e.g., 12V) on the side of the electric motor M when connector 12 is connected to the charging port R.

[0083] The base of signal line SL11 is connected to a reference potential (e.g., 0V) located in connector 12 via a given resistor 125 and a second switch 126. The second switch 126 switches between on / off states according to an instruction from control unit 110.

[0084] Since the signal line on the charging port R side, connected to the connection confirmation terminal T1, is connected to the reference potential provided in the connector 12 via resistor 125, the potential of a given contact point of the charging port R becomes a specific value. Therefore, the on-board charging control device can detect this to detect the insertion of the connector 12 into the charging port R. If the second switch 126 is turned on while the connection confirmation terminal T1 of the connector 12 is connected to the high potential of the on-board charging control device provided in the electric vehicle M, the on-board charging control device can detect that the connector 12 is connected to the charging port R. Conversely, when the second switch 126 is turned off, the base end of the signal line SL11 inside the connector 12 floats from the reference potential. Even when the connection confirmation terminal T1 of the connector 12 is connected to the high potential of the on-board charging control device provided in the electric vehicle M, the potential of the given contact point of the charging port R does not decrease when the second switch 126 is turned off, and the on-board charging control device detects that the connector 12 is not connected to the charging port R.

[0085] In the third embodiment, the control unit 110 can detect the on and off states of the start switch of the electric moving body M.

[0086] Figure 8 as well as Figure 9 This is a flowchart illustrating an example of the power supply processing of the wireless power supply system 100 according to the third embodiment. Regarding... Figure 8 as well as Figure 9 The processing steps shown in the flowchart are the same as those in the first embodiment. Figure 3The flowchart shows common processing steps, with the same step numbers labeled and detailed explanations omitted.

[0087] In the third embodiment, if it is determined that communication with the power supply device is possible (S103: Yes), the processor 114 of the control unit 110 determines whether the off-state of the start switch of the electric mobile body M can be detected (step S131). In step S131, the processor 114 does not detect the off-state of the start switch of the electric mobile body M, but only detects the stopping of the electric mobile body M, that is, only detects that the state of charging the drive battery can be achieved. If it is determined that the off-state of the start switch of the electric mobile body M cannot be detected (S131: No), since charging cannot be achieved because the on-state remains unchanged, the process ends in the same way as when it is determined that power cannot be received through the receiving coil 13 (S101: No).

[0088] When the processor 114 determines that it can detect the off state of the start switch of the electric mobile unit M (S131: Yes), it sets the second switch 126 to the on state (step S132). The second switch 126 can also be linked with the circuit that obtains the state of the start switch of the electric mobile unit M, becoming on when the start switch of the electric mobile unit M is off, and off when the start switch of the electric mobile unit M is on. Through step S132, the on-board charging control device of the electric mobile unit M can detect that the connector 12 is inserted into the charging port R.

[0089] Afterwards, processor 114 outputs a charging preparation signal to the on-board charging control device (S105), and executes steps S106-S110, which include pre-charging to increase the output in advance and preparatory actions based on a given protocol. If it is determined that charging is complete (S110: Yes), processor 114 executes the given charging end sequence (S111) and sets the second switch 126 to the off state (step S133). Through the process of step S133, the energization of the connection pin on the electric mobile body M side connected to the connection confirmation terminal T1 is released. Therefore, the on-board charging control device of the electric mobile body M can detect that the connector 12 has disengaged from the charging port R. Thus, on the electric mobile body M side, the start switch of the electric mobile body M can be set to on. Before and after this process, processor 114 disconnects the wireless communication connection with the power supply device (S114) and ends the process.

[0090] In step S110, the processor 114 determines whether charging is complete on the vehicle charging control device side if the charging rate of the battery to be powered reaches a given rate, but is not limited to this. In large electric mobile vehicles M with a battery full-charge capacity exceeding 100-200 kWh, even continuous charging at a power value of 10 kW requires 10-20 hours. Since it is desirable to avoid excessively long charging times for safety reasons, it is necessary to stop charging at a given time. For this purpose, the processor 114 can determine whether the continuous charging time has reached a given time (e.g., 10 hours) even if it is determined on the vehicle charging control device side that charging is not complete in step S110. This determination can be made on the vehicle charging control device side. If the given time has been reached, the processor 114 keeps the power supply from the power supply device unchanged, and after executing the processes of steps S111 and S133, sets the second switch to on (S132), and restarts charging through the processes of steps S108 and S109. Alternatively, charging may be stopped in response to an instruction from a power supply device or external source, or based on a stop instruction from an operation unit or the like provided in the control unit 110, except in the determination made in step S110.

[0091] In this way, without hindering the original wired power supply structure of the electric mobile body M, both wireless and wired power supply can be selected through the subsequent additional wireless power supply system 100.

[0092] The embodiments disclosed above are illustrative in all respects and are not intended to be limiting. The scope of the invention is set forth in the claims, which include all modifications within the meaning and scope of the claims.

[0093] Symbol Explanation

[0094] 100, 300 Wireless Power Supply Systems

[0095] 11 Main Body

[0096] 12 connectors

[0097] 13 Receiving coil

[0098] 110 Control Department

[0099] 111 Power Conversion Department

[0100] 114 processor

[0101] 115 Memory

[0102] 116 Wireless Communications Department

[0103] 122 Pin (locking part)

[0104] 124. Retreat mechanism.

Claims

1. A wireless power supply system, comprising: A receiving coil, which is installed on an electrically moving body; A connector, which connects to a charging port for wired power supply of the electric mobile body; and A power conversion unit, which is connected to the receiving coil and the connector, converts the power received by the receiving coil into power that can be supplied to the battery mounted on the electric vehicle via the charging port.

2. The wireless power supply system according to claim 1, wherein, The receiving coil is mounted on the outer surface of the electric moving body. The external dimensions of the casing of the receiving coil are within the protruding dimensions specified in the safety standards for the electric moving body.

3. The wireless power supply system according to claim 1, wherein, The receiving coil is mounted inside the housing of the electric moving body, facing outward.

4. The wireless power supply system according to claim 1, wherein, The total weight of the receiving coil, connector, and power conversion unit is within the weight specified in the safety standards for the electric mobile body.

5. The wireless power supply system according to any one of claims 1 to 4, wherein, The connector has a locking portion that engages with the charging port. The wireless power supply system includes a control unit that controls a retraction mechanism that retracts the locking portion of the connector, such that the locking portion of the connector does not engage with the charging port except when charging the battery using power received through the receiving coil.

6. The wireless power supply system according to any one of claims 1 to 4, wherein, The connector engages with the locking part located at the charging port. The wireless power supply system includes a control unit that controls a back-off mechanism so that the connector does not engage with the locking part of the charging port except when the battery is being charged using power received through the receiving coil.

7. The wireless power supply system according to any one of claims 1 to 4, wherein, The wireless power supply system has the following features: A wired connector that accepts power from a wired power supply plug; The first switch switches between connecting the input / output of the wired connector to the connector and connecting the output of the power conversion unit to the output of the connector. and The switching control unit controls the first switch so that, when the wired power supply plug is connected to the wired connector, the input / output to the wired connector is sent to the connector.

8. The wireless power supply system according to any one of claims 1 to 4, wherein, The wireless power supply system includes: a charging control unit that communicates with an on-board charging control device within the electric mobile body via a signal line contained in the charging port for wired power supply of the electric mobile body; and a wireless communication unit that wirelessly communicates with a power supply device that supplies power to the receiving coil. The charging control unit performs the following processing: Determine whether power receiving by the receiving coil can begin. If it is determined that power reception can begin, the power supply device is notified of permission to begin power supply. A given charging start process is performed between the on-board charging control device and the device, following a given protocol for wired power supply.

9. The wireless power supply system according to claim 8, wherein, When the charging control unit detects that the start switch of the electric mobile body is turned off while the connector is connected to the charging port, and detects that the electric mobile body is parked in a position where power can be supplied, it determines that it can start receiving power.

10. The wireless power supply system according to any one of claims 1 to 4, wherein, The connector includes a second switch that toggles the on / off state between the connection confirmation terminal and the reference potential. If the start switch of the electric moving body is detected to be off, the second switch is switched to on. When charging is complete, the second switch is switched to non-conducting mode.

Images