KR20200125445A - Apparatus and method for controlling wireless power transfer - Google Patents

Abstract

Disclosed is a method for controlling wireless power transmission performed by an electric vehicle device (EV device) receiving power from a power supply device. According to an embodiment of the present invention, the method for controlling wireless power transmission comprises the steps of: checking service details regarding a pairing method between a power supply device and an electric vehicle device and selecting a service; performing precision positioning with the power supply device in accordance with a precision positioning and pairing method associated with the selected service; performing a low frequency (LF) pairing in accordance with the selected service; performing an initial alignment check using pre-charging power transmission; and performing a low power excitation pairing in accordance with the selected service and a result of performing the initial alignment check.

Description

Wireless power transmission control method and apparatus TECHNICAL FIELD [APPARATUS AND METHOD FOR CONTROLLING WIRELESS POWER TRANSFER}

The present invention relates to a wireless power transmission control method and apparatus, and more particularly to a wireless power transmission control method performed by an electric vehicle device, a wireless power transmission control apparatus and a power supply device using the method.

Recently developed electric vehicles (EV) drive a motor with the power of a battery, and have fewer sources of air pollution, such as exhaust gas and noise, compared to conventional gasoline engine vehicles, and have fewer breakdowns, longer life, and driving. It has the advantage of simple operation.

Electric vehicles are classified into hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (EVs) according to their driving sources. HEVs have an engine as main power and a motor as auxiliary power. PHEV has a motor that is the main power and an engine that is used when the battery is discharged. EVs have motors, but no engines.

The electric vehicle charging system can be basically defined as a system that charges a battery mounted in an electric vehicle by using power from a grid of commercial power or an energy storage device. The electric vehicle charging system may have various forms depending on the type of electric vehicle. For example, the electric vehicle charging system may include a conductive charging system using a cable or a non-contact wireless power transmission system.

Electric vehicle charging control is performed through a communication protocol between the electric vehicle and the charging station. Therefore, all control of the electric vehicle charging session can be performed at the charging station or the electric vehicle. At this time, the user needs to check the charging state of the electric vehicle or control the charging progress state.

An object of the present invention for solving the above problems is to provide a wireless power transmission control method performed by an electric vehicle device (EV device).

Another object of the present invention for solving the above problems is to provide a power transmission control apparatus for an electric vehicle device (EV device) using the wireless power transmission control method.

Another object of the present invention for solving the above problems is to provide a wireless power transmission method performed by a power supply device that supplies power to an EV device.

A wireless power transmission control method performed by an EV device receiving power from a power supply device according to an embodiment of the present invention for achieving the above object includes the power supply device and the electric vehicle Checking service details regarding a method of precise positioning and pairing between devices and selecting a service; Performing precision positioning with the power supply device according to a precision positioning and pairing method associated with the selected service; Performing LF (Low Frequency) pairing according to the selected service; Performing an initial alignment check using pre-charging power transmission; And performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check.

The performing of the initial alignment check using the pre-charge power transmission may include determining whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on the pre-charge power received from the power supply device.

The determining whether to renegotiate WPT precision positioning based on the pre-charge power may include: determining whether a minimum power transfer efficiency of the pre-charge power is equal to or greater than a reference value; Determining that misalignment has occurred when the minimum power transmission efficiency is less than the reference value; And determining to perform WPT precision positioning renegotiation according to the occurrence of misalignment.

Meanwhile, the service discovery response message provided by the power supply device to check the service details may include a parameter indicating whether service renegotiation is possible.

Here, during charging, the service renegotiation may be triggered through a charging loop message by the power supply device or a power delivery request (PowerDeliveryReq) message by the electric vehicle device.

The service renegotiation may also be triggered when the power supply device and the EV device wake up from a charge pause period.

The pairing method may include one or more of LF (Low Frequency) pairing and LPE (Low Power Excitation) pairing.

The wireless power transmission control method may re-perform the steps of confirming the service details and selecting a service, performing the precise positioning, and performing the LF pairing according to the determination of performing the WPT fine positioning renegotiation. have.

After the step of performing the LF precision positioning and pairing, the step of performing authentication between the electric vehicle device and the power supply device may be further included.

The step of performing Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check may be performed when the minimum power transmission efficiency is greater than or equal to a reference value.

An apparatus for controlling power transmission of an electric vehicle device according to an embodiment of the present invention for achieving the above other object includes: an EV power circuit for receiving power provided by a power supply device; Processor; And a memory that stores at least one instruction executed through the processor.

The at least one command may include: a command for checking service details and selecting a service regarding the precise positioning and pairing method for the electric vehicle device and wireless power transmission; Instructions for performing fine positioning according to the fine positioning and pairing method associated with the selected service; A command to perform LF (Low Frequency) pairing according to the selected service; A command to perform an initial alignment check using pre-charging power transmission; And a command to perform Low Power Excitation (LPE) pairing according to the selected service and a result of performing the initial alignment check.

An apparatus for controlling power transmission of an electric vehicle device (EV device) includes: an EV communication controller (EVCC) that communicates with the power supply device using wireless communication; And an EV device Point to Point Signal (P2PS) controller that forms a P2PS connection with the power supply device using a low frequency (LF) signal.

The EV power circuit may receive a Low Power Excitation (LPE) signal transmitted from the power supply device.

The command to perform the initial alignment check using the pre-charge power transmission may include a command to determine whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on the pre-charge power received from the power supply device. have.

The command to determine whether to renegotiate WPT precision positioning based on the pre-charge power may include: a command to determine whether a minimum power transfer efficiency of the pre-charge power is equal to or greater than a reference value; An instruction for determining that misalignment has occurred when the minimum power transmission efficiency is less than the reference value; And an instruction for determining the execution of WPT precision positioning renegotiation according to the occurrence of misalignment.

Meanwhile, the service discovery response message provided by the power supply device to check the service details may include a parameter indicating whether service renegotiation is possible.

Here, during charging, the service renegotiation may be triggered through a charging loop message by the power supply device or a power delivery request (PowerDeliveryReq) message by the electric vehicle device.

The service renegotiation may also be triggered when the power supply device and the EV device wake up from a charge pause period.

In addition, the processor may re-execute a command for checking the service details and selecting a service, a command for performing the precise positioning, and a command for performing the LF pairing according to the determination to perform the WPT precise positioning renegotiation.

The command to perform Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check may be executed when the minimum power transmission efficiency is greater than or equal to a reference value.

A wireless power transmission method performed by a power supply device that supplies power to an electric vehicle device according to an embodiment of the present invention for achieving the another object is, a service from the electric vehicle device Checking a service status for a precise positioning and pairing method according to a detailed confirmation request, and replying to the electric vehicle device; Performing precision positioning with the electric vehicle device according to a precision positioning and pairing method associated with a service selected by the electric vehicle device; Performing LF (Low Frequency) pairing according to the selected service; Transmitting pre-charging power to be used for initial alignment check to the electric vehicle device; And performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing an initial alignment check. And transferring power to the electric vehicle device.

At this time, whether to renegotiate WPT (Wireless Power Transfer) precision positioning may be determined by the electric vehicle device based on the pre-charged power.

The wireless power transmission method may re-perform the steps of confirming the service details and selecting a service, performing the precise positioning, and performing the LF pairing according to the determination to perform the WPT fine positioning renegotiation. .

The pairing method may include one or more of LF (Low Frequency) pairing and LPE (Low Power Excitation) pairing.

The step of performing Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check may be performed when the minimum power transmission efficiency is greater than or equal to a reference value.

Meanwhile, the service discovery response message provided by the power supply device to check the service details may include a parameter indicating whether service renegotiation is possible.

Here, during charging, the service renegotiation may be triggered through a charging loop message by the power supply device or a power delivery request (PowerDeliveryReq) message by the electric vehicle device.

The service renegotiation may also be triggered when the power supply device and the EV device wake up from a charge pause period.

According to the present invention, wireless power transfer with better transmission efficiency can be provided by performing WPT (Wireless Power Transfer) precision positioning renegotiation and service renegotiation based on the transmission efficiency of pre-charged power.

1 is a conceptual diagram illustrating the concept of wireless power transmission for an electric vehicle to which an embodiment of the present invention is applied.
2 is a block diagram showing components associated with wireless power transmission according to an embodiment of the present invention.
3 is a schematic flowchart of wireless power transfer (WPT) according to an embodiment of the present invention.
4A to 4B are flowcharts illustrating a process of checking service details in wireless power transmission according to an embodiment of the present invention.
5A to 5B are flowcharts of a service selection process in wireless power transmission according to an embodiment of the present invention.
6A to 6B are flowcharts of a fine positioning setup process in wireless power transmission according to an embodiment of the present invention.
7A to 7B are flow charts of a fine positioning process in wireless power transmission according to an embodiment of the present invention.
8A to 8D are flowcharts of an LF pairing process in wireless power transmission according to an embodiment of the present invention.
9A to 9C are flowcharts of an LF pairing hold process in wireless power transmission according to an embodiment of the present invention.
10A to 10B are flowcharts of an authentication process in wireless power transmission according to an embodiment of the present invention.
11A to 11B are flowcharts of an Initial Alignment Check Setup process according to an embodiment of the present invention.
12A to 12E are flowcharts of an initial alignment check process according to an embodiment of the present invention.
13A to 13D are flowcharts of an LPE pairing process according to an embodiment of the present invention.
14A to 14C are flowcharts of an LPE pairing stop process according to an embodiment of the present invention.
15 is a flowchart illustrating service renegotiation in wireless power transmission (WPT) according to an embodiment of the present invention.
16A to 16B are flowcharts illustrating a process of checking service details in wireless power transmission according to another embodiment of the present invention.
17A to 17D are flowcharts of service selection and precision positioning setup in wireless power transmission according to another embodiment of the present invention.
18A to 18D are flowcharts of a precision positioning process and a pairing process in wireless power transmission according to another embodiment of the present invention.
19A to 19E are flowcharts of LF pairing hold and Initial Alignment Check Setup in wireless power transmission according to another embodiment of the present invention.
20A to 20E are flowcharts of an initial alignment check LF pairing stop process in wireless power transmission according to another embodiment of the present invention.
21 is a block diagram of an apparatus for controlling power transmission according to an embodiment of the present invention.
22 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.

본 발명은 다양한 변경을 가할 수 있고 여러 가지 실시예를 가질 수 있는 바, 특정 실시예들을 도면에 예시하고 상세한 설명에 상세하게 설명하고자 한다. 그러나, 이는 본 발명을 특정한 실시 형태에 대해 한정하려는 것이 아니며, 본 발명의 사상 및 기술 범위에 포함되는 모든 변경, 균등물 내지 대체물을 포함하는 것으로 이해되어야 한다. 각 도면을 설명하면서 유사한 참조부호를 유사한 구성요소에 대해 사용하였다.

In the present invention, various modifications may be made and various embodiments may be provided, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to a specific embodiment, it is to be understood to include all changes, equivalents, and substitutes included in the spirit and scope of the present invention. In describing each drawing, similar reference numerals have been used for similar elements.

Terms such as first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. The term "and/or" includes a combination of a plurality of related stated items or any of a plurality of related stated items.

When a component is referred to as being "connected" or "connected" to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in the middle. Should be. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or combinations thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms as defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and should not be interpreted as an ideal or excessively formal meaning unless explicitly defined in this application. Does not.

Some terms used in this specification are as follows.

Electric Vehicle (EV) may refer to an automobile defined in 49 Code of Federal Regulations (CFR) 523.3 or the like. The electric vehicle can be used on a highway and can be driven by electricity supplied from a vehicle-mounted energy storage device such as a rechargeable battery from a power supply outside the vehicle. The power supply source may include a residential or public electric service, or a generator using vehicle-mounted fuel.

An electric vehicle (EV) may be referred to as an electric car, an electric automobile, an electric road vehicle (ERV), a plug-in vehicle (PV), a plug-in vehicle (xEV), and the like. And xEV is BEV (plug-in all-electric vehicle or battery electric vehicle), PEV (plug-in electric vehicle), HEV (hybrid electric vehicle), HPEV (hybrid plug-in electric vehicle), PHEV (plug-in hybrid electric vehicle) or the like.

A plug-in electric vehicle (PEV) may be referred to as an electric vehicle that connects to a power grid to recharge the vehicle-mounted primary battery.

A plug-in vehicle (PV) may be referred to herein as a vehicle rechargeable through a wireless charging method without using a physical plug and socket from an Electric Vehicle Supply Equipment (EVSE).

Heavy duty vehicles (H.D. Vehicles) may refer to any vehicle with four or more wheels as defined in 49 CFR 523.6 or CFR 37.3 (bus).

Light duty plug-in electric vehicles have three or four wheels that are driven primarily by a rechargeable battery or other energized electric motor for use on public streets, roads and highways. It can refer to a vehicle that has. Lightweight plug-in electric vehicles can be specified with a total weight of less than 4.545 kg.

The wireless power charging system (WCS) may refer to a system for controlling wireless power transmission, alignment, and communication between GA and VA.

Wireless power transfer (WPT) may refer to the transmission of electric power through a contactless means to an electric vehicle in an AC power supply network such as a utility or a grid.

Utility provides electrical energy and is a set of systems that typically include Customer Information System (CIS), Advanced Metering Infrastructure (AMI), Rate and Revenue system, etc. May be referred to as. The utility makes energy available to plug-in electric vehicles through price tags or discrete events. In addition, the utility may provide information on tariff rates, intervals for measured power consumption, and verification of electric vehicle programs for plug-in electric vehicles.

Smart charging can be described as a system in which an EVSE and/or plug-in electric vehicle communicates with the power grid to optimize the time of the vehicle charging rate or discharge rate to the grid capacity or usage cost ratio.

Automatic charging may be defined as an operation of inductively charging a vehicle by placing a vehicle in an appropriate position with respect to a primary charger assembly capable of transmitting power. Automatic charging can be performed after obtaining the necessary authorizations and authorizations.

Interoperabilty may refer to a state in which components of a system that are relative to each other can work together to perform a desired operation of the entire system. Information interoperability can refer to the ability of two or more networks, systems, devices, applications or components to share information securely and effectively and easily use information with little or no discomfort by the user. .

The inductive charging system may refer to a system that electromagnetically transmits energy in a forward direction from an electricity supply network to an electric vehicle through a transformer in which two parts are loosely coupled. In this embodiment, the inductive charging system may correspond to the electric vehicle charging system.

The inductive coupler may refer to a transformer that is formed of a GA coil and a VA coil to transmit power through electrical insulation.

Inductive coupling may refer to magnetic coupling between two coils. The two coils may refer to a ground assembly coil and a vehicle assembly coil.

The ground assembly (GA) may refer to an assembly that includes a GA coil and other suitable components and is disposed on the ground or infrastructure side. Other suitable components may include at least one component for controlling the impedance and resonant frequency, a ferrite for strengthening the magnetic path, and an electromagnetic shielding material. For example, the GA may include a power/frequency conversion device required to function as a power source for a wireless charging system, wiring from the GA controller and the grid, and wiring between each unit and filtering circuits, housing, and the like.

Vehicle assembly (VA) may refer to an assembly that is disposed in a vehicle including a VA coil and other suitable components. Other suitable components may include at least one component for controlling the impedance and resonant frequency, ferrites for strengthening the magnetic path, and electromagnetic shielding material. For example, the VA may include wiring between each unit, filtering circuits, housing, etc., as well as wiring of a rectifier/power converter and VA controller and vehicle battery required to function as a vehicle component of a wireless charging system. .

The above-described GA may be referred to as a supply device, a power supply side device, and the like, and similarly, the VA may be referred to as an electric vehicle device (EV device), an electric vehicle side device, and the like.

The power supply side device may be a device that provides a contactless coupling to an electric vehicle side device, that is, a device outside the electric vehicle. The power supply side device may be referred to as a primary side device. When the electric vehicle is receiving power, the power supply side device can act as a power source that transmits power. The power supply side device can include a housing and all covers.

An electric vehicle-side device (EV device) may be an electric vehicle-mounted device that provides a contactless coupling to a power supply-side device. The electric vehicle side device may be referred to as a secondary side device. When the electric vehicle receives power, the electric vehicle-side device can transfer power from the power supply-side device to the electric vehicle. An electric vehicle-side device may include a housing and all covers.

The ground assembly controller may be a part of the GA that adjusts the output power level for the GA coil based on information from the vehicle.

A vehicle assembly controller may be part of a VA that monitors specific vehicle parameters during charging and initiates communication with the GA to control the output power level.

The above-described GA controller may be referred to as a supply power circuit (SPC) of a power supply side device, and the VA controller may be referred to as an EV power circuit (EVPC).

Magnetic gap is between the highest plane of the top of the litz wire or the top of the magnetic material of the GA coil and the lowest plane of the bottom of the litz wire or the magnetic material of the VA coil when they are aligned with each other. May refer to the vertical distance.

Ambient temperature may refer to the ground level temperature measured in the atmosphere of a target subsystem that is not directly exposed to sunlight.

Vehicle ground clearance may refer to the vertical distance between the road or pavement and the bottom of the vehicle floor fan.

The vehicle magnetic ground clearance may refer to the vertical distance between the road pavement and the insulating material of the vehicle-mounted VA coil or the lowest floor plane of the Ritz line.

Vehicle assembly (VA) coil surface distance (Vehicle assembly coil surface distance) may refer to the vertical distance between the bottom bottom plane of the Ritz wire or the magnetic material of the VA coil and the lowest outer surface of the VA coil. These distances may include protective coverings and additional items wrapped in coiled packaging.

The aforementioned VA coil may be referred to as a secondary coil, a vehicle coil, a receiver coil, and the like, and similarly, a ground assembly coil (GA coil) is a primary coil. It may be referred to as a primary coil, a transmit coil, or the like.

The exposed conductive component may refer to a conductive component of an electrical device (eg, an electric vehicle) that can be contacted by a person and does not normally flow electricity, but can flow electricity in the event of a failure.

Hazardous live component may refer to a live component that can give harmful electric shock under certain conditions.

Live component may refer to any conductor or conductive component that is electrically active in basic applications.

Direct contact can refer to the contact of a person who is an organism.

Indirect contact may refer to contact of a person with an active, electrically conductive component exposed to an insulation failure (see IEC 61140).

Alignment may refer to a procedure for finding a relative position of an electric vehicle side device with respect to a power supply side device and/or a procedure for finding a relative position of a power supply side device with respect to the electric vehicle side device for a specified efficient power transmission. In the present specification, alignment may refer to position alignment of the wireless power transmission system, but is not limited thereto.

Pairing may refer to a procedure in which a vehicle (electric vehicle) is associated with a single dedicated ground assembly (power supply side device) arranged to transmit power. In the present specification, the pairing may include a procedure of associating a charging spot or a specific ground assembly with a vehicle assembly controller. Correlation/Association may include a procedure for establishing a relationship between two peer communication entities.

High level communication can process all information that exceeds the information responsible for command and control communication. The data link for high-level communication may use a PLC (Power line communication), but is not limited thereto.

Low power excitation may refer to activating it so that the electric vehicle senses the power supply side device to perform precision positioning and pairing, but is not limited thereto and vice versa.

SSID (Service set identifier) is a unique 32-character identifier attached to the header of a packet transmitted over a wireless LAN. The SSID identifies the basic service set (BSS) that the wireless device tries to access. SSID basically distinguishes several wireless LANs from each other. Therefore, all APs (access points) and all terminal/station equipments that intend to use a specific WLAN can use the same SSID. Equipment that does not use a unique SSID cannot join the BSS. Since the SSID is displayed in plain text, it may not provide any security features to the network.

ESSID (Extended Service Set Identifier) is the name of the network to be accessed. Similar to SSID, but may be a more extended concept.

BSSID (Basic Service Set Identifier) is usually 48 bits and is used to identify a specific BSS (basic service set). In the case of an infrastructure BSS network, the BSSID may be a medium access control (MAC) of the AP device. In the case of an independent BSS or ad hoc network, the BSSID may be generated with an arbitrary value.

The charging station may include at least one or more ground assemblies and at least one or more ground assembly controllers that manage at least one or more ground assemblies. The ground assembly may include at least one wireless communication device. The charging station may refer to a place equipped with at least one ground assembly installed in a home, an office, a public place, a road, a parking lot, or the like.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram illustrating the concept of wireless power transmission for an electric vehicle to which an embodiment of the present invention is applied.

Referring to FIG. 1, wireless power transmission may be performed by at least one component of an electric vehicle 10 and a charging station 20, and wirelessly transmitting power to the electric vehicle 10 Can be used for

Here, the electric vehicle 10 may generally be defined as an automobile that supplies a current derived from a rechargeable energy storage device such as the battery 12 to an energy source of an electric motor, which is a power device.

However, the electric vehicle 10 according to the present invention may include a hybrid vehicle having an electric motor and a general internal combustion engine together, and not only an automobile, but also a motorcycle, a cart, It may include a scooter and an electric bicycle.

In addition, the electric vehicle 10 may include a receiving pad 11 including a receiving coil to wirelessly charge the battery 12, and may include a plug connection port to charge the battery 12 by wire. May be. In this case, the electric vehicle 10 capable of charging the battery 12 by wire may be referred to as a plug-in electric vehicle (PEV).

Here, the charging station 20 may be connected to a power grid 30 or a power backbone, and an alternating current (AC) to the transmission pad 21 including a transmission coil through a power link. Alternatively, direct current (DC) power may be provided.

In addition, the charging station 20 can communicate with a power grid 30 or an infrastructure management system or an infrastructure server that manages the power grid through wired and wireless communication, and performs wireless communication with the electric vehicle 10 can do.

Here, the wireless communication may include Bluetooth, zigbee, cellular, wireless local area network, and the like.

In addition, for example, the charging station 20 may be located in various places such as a parking lot attached to the house of the owner of the electric vehicle 10, a parking area for charging an electric vehicle at a gas station, a shopping center or a parking area at work.

Here, in the process of wirelessly charging the battery 12 of the electric vehicle 10, the receiving pad 11 of the electric vehicle 10 is located in an energy field by the transmission pad 21, and the transmission pad 21 The transmitting coil of and the receiving coil of the receiving pad 11 may be mutually interacted or coupled to each other. Electromotive force is induced in the receiving pad 11 as a result of the interaction or coupling, and the battery 12 may be charged by the induced electromotive force.

In addition, all or part of the charging station 20 and the transmission pad 21 may be referred to as a ground assembly (GA), and the ground assembly may refer to the meaning defined above.

In addition, the receiving pad 11 of the electric vehicle 10 and all or some of the other internal components of the electric vehicle may be referred to as a vehicle assembly (VA), wherein the vehicle assembly may refer to the meaning defined above.

Here, the transmission pad or the reception pad may be configured as non-polarized or polarized.

At this time, if the pad is non-polar, there may be one pole in the center of the pad and the opposite pole around the outside. Here, the flux may be formed to exit from the center of the pad and return at all outer boundaries of the pad.

In addition, when the pad is polar, it may have a respective pole at either end of the pad. Here, the magnetic flux may be formed based on the orientation of the pad.

2 is a block diagram showing components associated with wireless power transmission according to an embodiment of the present invention.

Magnetic field wireless power transfer (MF-WPT) for electric vehicles is the transfer of electrical energy from the supply network via electric or magnetic field or radio waves between the primary and secondary devices without current flow through a galvanic connection. Can be defined.

Referring to FIG. 2, the MF-WPT may be performed between a power supply device 100 and an EV device 200. Here, the power supply device 100 may be connected to a supply network, and the EV device 200 may be associated with a Rechargeable Energy Storage System (RESS).

More specifically, the power supply device 100 includes a supply power circuit (SPC) 130, a supply equipment communication controller (SEC) 140, and a supply device Point to Point Signal (P2PS). ) A controller (Supply device P2PS controller) 150 may be included. The supply power circuit 130 may include a primary device 131 and a supply power electronics 132.

The EV device 200 includes an EV power circuit (EVPC) 230, an EV communication controller (EVCC) 240, and an EV device P2PS controller 250. ) Can be included. Here, the EV power circuit 230 may include a secondary device 231 and an EV power electronics 232.

A wireless power flow (a) exists between the primary device 131 and the secondary device 231. That is, wireless power transmission from the primary device 131 to the secondary device 231 occurs. In addition, a wireless P2PS interface (b) is formed between the supply device P2PS controller 150 and the EV device P2PS controller 250, and wireless communication between the supply device communication controller 140 and the EV communication controller 240 An interface (wireless communication interface) (c) may be formed.

At this time, the wireless communication standard between the supply device communication controller and the EV communication controller may follow IEEE Std 802.11. Further, a wireless P2PS interface formed between the supply device P2PS controller 150 and the EV device P2PS controller 250 may be implemented through an LF signal.

3 is a schematic flowchart of wireless power transfer (WPT) according to an embodiment of the present invention.

Referring to Figure 3, the wireless power transmission method according to the present invention, Service Detail/Service Selection (S310), Precision Positioning Setup/Fine Positioning (Fine Positioning Setup/Fine Positioning) (S320), LF pairing/LF pairing hold (S330), Authorization (S340), Initial Alignment Check Setup/Initial Alignment Check (S350), LPE It may include a pairing (LPE pairing) / LPE pairing stop (LPE pairing stop) (S360) step.

Here, the operating subjects of wireless power transmission according to the present invention may be a power supply device and an EV device. More specifically, the supply communication controller (SECC) 140 in the power supply device, the supply power circuit (SPC) 130, and the supply device P2PS controller 150, and the EV communication controller (EVCC) in the EV device 200 ) 240, the EV power circuit 230, the EV device P2PS controller 250, and the like may be operating subjects of wireless power transmission according to the present invention.

Here, the supply power circuit 130 may include an SD WPT controller and an SD LPE (Low Power Excitation) controller, and the supply device P2PS controller 150 may include an SD LF (Low Frequency) controller and an SD LF antenna. have.

Further, the EV power circuit 230 may include an EV WPT controller and an EV LPE controller, and the EV device P2PS controller 250 may include an EV LF controller and an EV LF antenna.

Details of each step will be described with reference to FIGS. 4 to 14 below.

4 to 14, for convenience of illustration, the power supply device 100 is provided separately from the supply communication controller (SECC) 140, the supply power circuit (SPC) 130, and the supply device P2PS controller 150. Although expressed in blocks, the power supply device may include a supply communication controller (SECC) 140, a supply power circuit (SPC) 130, and a supply device P2PS controller 150. Accordingly, the power supply device 100 shown in FIGS. 4 to 14 may be understood as a main processor of a power supply device that performs wireless power transmission according to the present invention.

The EV device 200 may also include an EV communication controller (EVCC) 240, an EV power circuit 230, and an EV device P2PS controller 250. Accordingly, the EV device 200 illustrated in FIGS. 4 to 14 may be understood as a main processor of an EV device performing wireless power transmission according to the present invention.

4A to 4B are flowcharts illustrating a process of checking service details in wireless power transmission according to an embodiment of the present invention.

4A to 4B, the service detail confirmation process is performed according to the service detail confirmation request of the EV device, the EV power circuit 230, the EV device P2PS controller 250, the supply power circuit 130, and the supply device P2PS controller ( 150) may include the step of checking the state of the EV LPE, the state of the EV LF, the state of the supply device (SD) LPE, and the state of the SD LF, and returning each state information to the EV device.

5A to 5B are flowcharts of a service selection process in wireless power transmission according to an embodiment of the present invention.

5A to 5B, the EV device 200 confirming the state of the EV LPE, the state of the EV LF, the state of the SD LPE, and the state of the SD LF through a service detail check process can be provided by the EV device and the power supply device. Compare services (S510).

That is, whether the service that the EV device (EVD) can provide is LPE, LF, or whether both LPE and LF can provide services, and whether the service that the power supply device (SD) can provide is LPE, LF, or LPE and LF. They all check whether service is available and compare them with each other. As a result of the comparison, if a service that can be provided by the EV device and a service that can be provided by the power supply device (SD) are different, the service session is terminated or a re-association procedure is performed (S520).

When there is more than one service of the same type that the EV device and the power supply device (SD) can provide, the EV device selects the service (S530), and the service selection result is transmitted to the power supply device 100 through the EVCC 240. ).

6A to 6B are flowcharts of a fine positioning setup process in wireless power transmission according to an embodiment of the present invention.

In the precision positioning setup process (S610), the EV device first checks the precision positioning method selected through the service detail confirmation and service selection process. Depending on whether the EV device uses LF, LPE, or both methods for precise positioning, it sends a FinePositioning Initialization Request (FinePositioningInitializationReq.) to the EV LPE controller or the EV device P2PS controller, and from them, fine positioning Receives a response (FinePositioningInitializationRes) to the initialization request.

The EV device transmits a precision positioning setup request (FinePositioningSetupReq.) to the power supply device when the confirmation for the LPE and/or LF for precision positioning is completed. The power supply device 100 requests precision positioning initialization from the SD LPE controller or the SD P2PS controller according to whether the power supply device uses LF, LPE, or both methods for precision positioning (FinePositioningInitializationReq.) By transmitting and receiving a response (FinePositioningInitializationRes.) to the request for precise positioning initialization from them, a precision positioning setup procedure in the power supply device is performed (S620).

7A to 7B are flow charts of a fine positioning process in wireless power transmission according to an embodiment of the present invention.

When the precision positioning setup procedure is completed, the EV device transmits a precision positioning wait request (FinePositioningAwaitReq.) signal to the EV power circuit 230 and the EV device P2PS controller 250 and receives a response signal from them (S710). The power supply device also transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the SD power circuit 130 and the supply device P2PS controller 150 and receives a response signal from them (S720).

In the following pairing procedure, LF pairing or LPE pairing may be performed according to the precise positioning method serviced by the EV device and the power supply device, and LF pairing and LPE pairing may be performed when used in both precise positioning methods. .

8A to 8D are flowcharts of an LF pairing process in wireless power transmission according to an embodiment of the present invention.

8A to 8D, in the LF pairing process, the EV device P2PS controller 250 transmits a magnetic field using the EV LF antenna according to the LF pairing start request (LFPairingStartReq.) of the EV device (S810).

The power supply device 100 detects a magnetic field transmitted by the EV LF antenna, that is, an LF signal from the SD LF antenna, and returns to the EV device that it has received LF pairing data (S820).

9A to 9C are flowcharts of an LF pairing hold process in wireless power transmission according to an embodiment of the present invention.

LF pairing may be held by a pairing hold request when necessary, as shown in FIGS. 9A to 9C.

10A to 10B are flowcharts of an authentication process in wireless power transmission according to an embodiment of the present invention.

After LF pairing, the authentication process continues as shown in FIGS. 10A to 10B, and when the corresponding procedure is a WPT precision positioning renegotiation procedure (Yes in S1010), the authentication process may be omitted.

According to the authentication request (EVDAuthorizationReq.) of the EV device, authentication is performed between the EV device 200 and the power supply device 100.

Additionally, the authentication process of FIG. 10 may include an identification detail confirmation procedure. The identification detail confirmation procedure may be performed in a form in which the EV device transmits an identification detail confirmation request (EVDIdentificationDetailReq; IdentificationDetailReq) to the power supply device and receives a response (SDIdentificationDetailRes; IdentificatioDetailRes).

11A to 11B are flowcharts of an Initial Alignment Check Setup process according to an embodiment of the present invention.

During the initial alignment check setup process, the EV device first transmits an initial alignment check setup request to the power supply device 100, and causes the EV power circuit 230 to perform pre-charging initialization and pre-charging. Await) is requested (S1110).

The power supply device 100 causes the SD WPT controller of the supply power circuit 130 to perform pre-charging initialization and pre-charging Await according to the request of the EV device ( S1120).

12A to 12E are flowcharts of an initial alignment check process according to an embodiment of the present invention.

After the initial alignment check setup procedure, the EV device 200 transmits an initial alignment check start request (InitialAlignmentCheckStartReq.) to the power supply device 100. The power supply device receiving this causes the SD WPT controller to perform pre-charing power transmission.

The EV power circuit 230 of the EV device receives the pre-charge power transmitted from the power supply device, and determines whether to renegotiate WPT precision positioning based on the received pre-charge power (S1200).

More specifically, in determining whether to renegotiate WPT precision positioning (S1200), the EV device determines whether the minimum power transfer efficiency of the pre-charged power received from the power supply device is greater than or equal to a reference value, and transmits the minimum power. If the efficiency is higher than the standard value, the LF pairing interruption procedure and the LPE pairing procedure are performed without proceeding with WPT precision positioning renegotiation. Here, the reference value related to power transmission efficiency may be 85%.

On the other hand, when the minimum power transmission efficiency is less than the reference value, it is determined that mis-alignment has occurred and whether to perform WPT pairing again.

If WPT pairing is not performed again, alignment is stopped, safety monitoring and diagnostic check are performed, and V2G communication session is terminated or re-association is performed.

On the other hand, when WPT pairing is re-performed, it is determined whether the number of re-performing WPT pairing is greater than or equal to a threshold related to the repetitive WPT pairing number. If the number of re-performing WPT pairing is less than the threshold, the WPT pairing procedure continues.

If the number of times the WPT pairing is re-performed is more than the repetitive WPT pairing-related threshold, the EV device and the power supply device are checked for LF service and/or LPE service availability, and then WPT fine positioning renegotiation is performed. Proceeding to renegotiate WPT precision positioning means proceeding to the service selection step examined through the embodiments of FIGS. 5A and 5B, and then performing the precision positioning setup and precision positioning, LF pairing, and LF pairing hold procedure again. In this case, the authentication (authorization) step may be omitted in the WPT precision positioning renegotiation procedure as described through FIGS. 10A and 10B.

13A to 13D are flowcharts of an LPE pairing process according to an embodiment of the present invention.

When the initial alignment check is completed, the power supply device receives the LPE pairing request from the EV device and causes the primary device to transmit a magnetic field, that is, an LPE signal through the SD WPT controller. LPE pairing is performed by the secondary device of the EV device receiving the LPE signal transmitted through the primary device of the SD WPT controller.

14A to 14C are flowcharts of an LPE pairing stop process according to an embodiment of the present invention.

During LPE pairing, the EV device compares the tolerance area of the power supply device with the position value of the EV device, and compares the center alignment point of the power supply device with the position value of the EV device to continue or stop WPT pairing. Decide whether it is.

When it is decided to stop pairing using the LPE, the SD WPT controller of the power supply device instructs the primary device to stop transmitting the magnetic field, that is, the LPE signal.

After the LPE pairing is stopped, actual power transmission between the primary device and the secondary device may be performed. When the charging procedure is stopped after the actual power transmission procedure is started, that is, the charging session may be stopped. According to embodiments of the present invention, as described below, when service renegotiation for WPT precise positioning and pairing is required, the charging session may be stopped.

15 is a flowchart illustrating service renegotiation in wireless power transmission (WPT) according to an embodiment of the present invention.

According to an embodiment of the present invention, the process considered in service renegotiation during wireless power transmission is a session setup step (S1510), a service discovery step (S1520), a service selection step (S1530), a charging loop step (S1540), and a power transfer step. (S1550), a session interruption step (S1560) may be included.

As described above, a service renegotiation procedure, which is a procedure for the EVCC or SECC to reconsider the current service selection, may be necessary so that the EV can select a different service set of the same service or a different parameter value.

Examples of service changes include changing from scheduled control to dynamic control or vice versa, changing between AC charging and DC charging, and adding or removing a value-added service (VAS).

In the charging session, the SECC can indicate whether service renegotiation is possible during the session through the first ServiceDiscoveryRes message. To this end, the ServiceDiscoveyRes message may include parameters having the following characteristics.

-Parameter name: ServiceRenegotiationAllowed

-Type: Boolean

-Inclusion: Mandatory

The "ServiceRenegotiationAllowed" parameter is included in the first ServiceDiscoveryRes message and is not changed during the session. If the EVCC or SECC violates the determination according to the parameter, the session is terminated.

In the embodiment of Fig. 15, two cases in which service renegotiation occurs are shown.

The first case is a case in which service renegotiation is triggered during charging. For example, a service renegotiation may be triggered during charging loop message exchange (S1540) such as AC_EnergyTransferLoop, DC_EnergyTransferLoop, and WPT_EnergyTransferLoop.

When the SECC triggers the service renegotiation, the SECC indicates the intention of the service renegotiation by setting "EVSENotification.EVSEStatus" in the charging loop message it sends to "ServiceRenegotiation". However, even in this case, if the "ServiceRenegotiationAllowed" parameter is set to "False", the EV may ignore the contents of the EVSENotification.EVSEStatus parameter.

When EVCC triggers service renegotiation, first, a PowerDeliveryReq message with the ChargeProgress parameter set to "Stop" is transmitted to the SECC, and the sequence continues until the session is stopped. In addition, SessionStopReq with ChargingSession set to "ServiceRenegotiation" is transmitted. If SessionStopRes. If the ResponseCode of the message is "OK", it sends a ServiceDiscoveryReq message to SECC, and then selects another service.

If SessionStopRes. If the ResponseCode of the message indicates that service renegotiation is not allowed (eg, "FAILED_NoServiceRenegotiationSupported"), the session is terminated. For example, if the ServiceRenegotiationAllowed parameter is "False", the SECC returns SessionStopRes. Send by setting the ResponseCode of the message as "FAILED_NoServiceRenegotiationSupported".

A second case related to service renegotiation is a case where service renegotiation is triggered when waking up from a paused period. Here, the pause period is a session duration in which no energy is transmitted and communication between the EVCC and the SECC is not activated. Upon wakeup triggered by EVCC or SECC, EVCC and SECC perform the entire sequence from the Session Setup step (S1510) to the charging loop (S1540).

When the SECC triggers service renegotiation, the SECC provides a different set of services and parameters within the ServiceDiscoveryRes message and ServiceDetailRes message.

Here, the ServiceDiscoveryRes message and the ServiceDetailRes message are messages that the SECC responds according to the request for checking service details of the EV device, and may be understood as messages having the same or similar meaning or function.

When the EVCC triggers service renegotiation, different services and/or parameters can be selected from before.

If the SECC does not provide the same service/parameters when service renegotiation is not allowed, the EVCC must stop the session. In addition, when EVCC selects a service/parameter different from the one previously selected, SECC must send "FAILED_NoServiceRenegotiationSupported" as a response code.

16 to 20 illustrate an operation flow of a wireless power transmission method according to another embodiment of the present invention.

The wireless power transmission method according to another embodiment of the present invention may include a service detail check, service selection, precise positioning setup, precise positioning, LF pairing, LF pairing hold, initial alignment check setup, and LF pairing interruption procedure.

16A to 16B are flowcharts illustrating a process of checking service details in wireless power transmission according to another embodiment of the present invention.

The service detail confirmation process is performed by the EV power circuit 230, the EV device P2PS controller 250, the supply power circuit 130, and the supply device P2PS controller 150 according to the EV device's service detail confirmation request. Checking the status of the EV LF, the SD LPE, and the SD LF, and returning each status information to the EV device.

17A to 17D are flowcharts of service selection and precision positioning setup in wireless power transmission according to another embodiment of the present invention.

17A to 17D, the EV device 200 having confirmed the status of the EV LPE, the status of the EV LF, the status of the SD LPE, and the status of the SD LF through a service detail check process can be provided by the EV device and the power supply device. Compare services.

That is, whether the service that the EV device (EVD) can provide is LPE, LF, or whether both LPE and LF can provide services, and whether the service that the power supply device (SD) can provide is LPE, LF, or LPE and LF. They all check whether service is available and compare them with each other. As a result of the comparison, when a service that can be provided by the EV device and a service that can be provided by the power supply device (SD) are different from each other, the service session is terminated or a re-association procedure is performed.

When there is one or more services of the same type that the EV device and the power supply device SD can provide, the EV device selects the service and transmits the service selection result to the power supply device 100 through the EVCC.

In the process of fine positioning setup that follows, the EV device first checks the precise positioning method. Depending on whether the EV device uses LF for precision positioning, LPE, or both, it sends a precision positioning initialization request to the EV LPE controller or EV device P2PS controller, and responds to the precision positioning initialization request from them. Receive a response. The EV device transmits a precision positioning setup request (FinePositioningSetupReq.) to the power supply device when the confirmation for the LPE and/or LF for precision positioning is completed.

The power supply device 100 requests precision positioning initialization from the SD LPE controller or the SD P2PS controller according to whether the power supply device uses LF, LPE, or both methods for precision positioning (FinePositioningInitializationReq.) And receive a response (FinePositioningInitializationRes.) to a request for precise positioning initialization from them.

18A to 18D are flowcharts of a precision positioning process and a pairing process in wireless power transmission according to another embodiment of the present invention.

When the precision positioning setup procedure is completed, the EV device transmits a precision positioning wait request (FinePositioningAwaitReq.) signal to the EV power circuit 230 and the EV device P2PS controller 250 and receives a response signal from them. The power supply device also transmits a fine positioning wait request (FinePositioningAwaitReq.) signal to the SD power circuit 130 and the supply device P2PS controller 150 and receives a response signal from them.

In a subsequent pairing process, the EV device P2PS controller 250 may transmit a magnetic field using the EV LF antenna in response to an LF pairing start request (LFPairingStartReq.) of the EV device.

The power supply device 100 detects a magnetic field transmitted by the EV LF antenna, that is, an LF signal from the SD LF antenna, and returns to the EV device that it has received LF pairing data.

19A to 19E are flowcharts of LF pairing hold and Initial Alignment Check Setup in wireless power transmission according to another embodiment of the present invention.

During pairing, the EV device compares the tolerance area of the power supply device with the position value of the EV device, and compares the center alignment point of the power supply device with the position value of the EV device to determine whether to continue or stop WPT pairing. You can decide.

That is, LF pairing may be held by a pairing hold request for a required time as shown in FIG. 19.

Thereafter, in the initial alignment check setup process, the EV device first transmits an initial alignment check setup request to the power supply device 100, and causes the EV power circuit 230 to pre-charging initialization and standby. -charging Await) is requested.

The power supply device 100 also causes the SD WPT controller of the supply power circuit 130 to perform pre-charging initialization and pre-charging await according to the request of the EV device.

20A to 20E are flowcharts of an initial alignment check and LF pairing stop process in wireless power transmission according to another embodiment of the present invention.

After the initial alignment check setup procedure, the EV device 200 transmits an initial alignment check start request (InitialAlignmentCheckStartReq.) to the power supply device. The power supply device receiving this causes the SD WPT controller to perform pre-charing power transmission.

The EV power circuit 230 of the EV device receives the pre-charge power transmitted by the power supply device and determines whether to renegotiate WPT precision positioning based on the received pre-charge power.

In determining whether to renegotiate WPT precision positioning, the EV device determines whether the minimum power transfer efficiency of the pre-charged power received from the power supply device is greater than or equal to the reference value, and if the minimum power transfer efficiency is greater than or equal to the reference value, Without proceeding with WPT precision positioning renegotiation, a post-scheduled procedure, ie, pairing interruption and power transmission procedure, is performed. Here, the reference value may be 85%.

On the other hand, when the minimum power transmission efficiency is less than the reference value, it is determined that mis-alignment has occurred and whether to perform WPT pairing again.

If WPT pairing is not performed again, alignment is stopped. On the other hand, when WPT pairing is re-performed, it is determined whether the number of re-performing WPT pairing is greater than or equal to a threshold value related to the repetitive WPT pairing number. When the number of times the WPT pairing is re-performed is less than the threshold, the procedure returns to the WPT pairing procedure shown in FIG. 18 and continues with the subsequent procedure.

If the number of times the WPT pairing is re-performed is more than the repetitive WPT pairing-related threshold, the EV device and power supply device are checked for LF/LPE service availability, and then WPT fine positioning renegotiation is performed. Proceeding the WPT precision positioning renegotiation means proceeding to the service selection step described through the embodiment of FIG. 17, and then performing the precision positioning setup and precision positioning, pairing and pairing hold procedures again.

Meanwhile, when the initial alignment check procedure is completed, LF pairing is stopped, and actual power transmission, charging control, and re-scheduling between the primary device and the secondary device may be performed.

21 is a block diagram of an apparatus for controlling power transmission according to an embodiment of the present invention.

The power transmission control apparatus 200 illustrated in FIG. 21 may be an EV device. That is, in the present specification, the configuration of the power transmission control apparatus 200 is not limited to the name and may be defined by a function. In addition, one component may perform a plurality of functions, and a plurality of components may perform one function.

The power transmission control apparatus 200 may include at least one processor 210 and a memory 220 that stores at least one command for executing the above-described operation through the processor.

The processor may execute a program command stored in a memory, and may include a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to the present invention are performed. It can mean. The memory may be composed of a volatile storage medium and/or a non-volatile storage medium, and may be composed of a read-only memory (ROM) and/or a random access memory (RAM).

The at least one command may include: a command for checking service details and selecting a service regarding the precise positioning and pairing method for the electric vehicle device and wireless power transmission; Instructions for performing fine positioning according to the fine positioning and pairing method associated with the selected service; A command to perform LF (Low Frequency) pairing according to the selected service; A command to perform an initial alignment check using pre-charging power transmission; And a command to perform Low Power Excitation (LPE) pairing according to the selected service and a result of performing the initial alignment check.

The power transmission control apparatus 200 may also include an EV power circuit 230 for receiving power provided by a power supply device; An EV communication controller (EVCC) 240 in communication with the power supply device using wireless communication; And an EV device P2PS controller 250 for forming a P2PS connection with the power supply device using a low frequency (LF) signal.

Here, the EV power circuit may receive a Low Power Excitation (LPE) signal transmitted from the power supply device.

The command to perform an initial alignment check using the pre-charging power transfer is to determine whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on the pre-charge power received from the power supply device. May contain orders.

The command to determine whether to renegotiate WPT precision positioning based on the pre-charge power may include: a command to determine whether a minimum power transfer efficiency of the pre-charge power is equal to or greater than a reference value; An instruction for determining that misalignment has occurred when the minimum power transmission efficiency is less than the reference value; And an instruction for determining the execution of WPT precision positioning renegotiation according to the occurrence of misalignment.

In this case, the processor may re-perform a command to check the service detail and select a service, a command to perform the precise positioning, and a command to perform the LF pairing according to the determination to perform the WPT precise positioning renegotiation. have.

The command to perform Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check may be executed when the minimum power transmission efficiency is greater than or equal to a reference value.

Additionally, the service discovery response message provided by the power supply device to check the service details may include a parameter indicating whether service renegotiation is possible. Here, the service renegotiation may be triggered by the power supply device or the electric vehicle device during charging, or when the power supply device and the EV device wake up from a charging pause period.

22 is a block diagram of a wireless power transmission apparatus according to an embodiment of the present invention.

The wireless power transmission device 100 shown in the embodiment shown in FIG. 22 may be a power supply device. That is, in the present specification, the configuration of the wireless power transmission apparatus 100 is not limited to the name and may be defined by a function. In addition, one component may perform a plurality of functions, and a plurality of components may perform one function.

The wireless power transmission apparatus 100 may include at least one processor 110 and a memory 120 that stores at least one instruction for executing the above-described operation through the processor.

The processor may execute a program command stored in a memory, and may include a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the methods according to the present invention are performed. It can mean. The memory may be composed of a volatile storage medium and/or a non-volatile storage medium, and may be composed of a read-only memory (ROM) and/or a random access memory (RAM).

Here, the at least one command may include: a command for checking a service state for a precise positioning and pairing method according to a request for checking service details from an electric vehicle device and returning a response to the electric vehicle device; Instructions for performing precision positioning with the electric vehicle device according to a precision positioning and pairing method associated with a service selected by the electric vehicle device; A command to perform LF (Low Frequency) pairing according to the selected service; A command for transmitting pre-charging power to be used for initial alignment check to the electric vehicle device; And a command to perform Low Power Excitation (LPE) pairing according to the selected service and a result of performing the initial alignment check. And an instruction to deliver power to the electric vehicle device.

The wireless power transmission device 100 also includes a supply power circuit (SPC) 130 for transmitting power to the EV device, a supply device communication controller 140 for communicating with the EV device using wireless communication, and an LF. It may further include a supply device P2PS controller 150 for forming a P2PS connection with the EV device using the signal.

The operation according to an embodiment of the present invention can be implemented as a computer-readable program or code on a computer-readable recording medium. The computer-readable recording medium includes all types of recording devices that store data that can be read by a computer system. In addition, the computer-readable recording medium may be distributed over a computer system connected through a network to store and execute a computer-readable program or code in a distributed manner.

In addition, the computer-readable recording medium may include a hardware device specially configured to store and execute program commands, such as ROM, RAM, and flash memory. The program instructions may include not only machine language codes such as those produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter or the like.

While some aspects of the invention have been described in the context of an apparatus, it may also represent a description according to a corresponding method, where a block or apparatus corresponds to a method step or characteristic of a method step. Similarly, aspects described in the context of a method can also be represented by a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device such as, for example, a microprocessor, a programmable computer or electronic circuit. In some embodiments, one or more of the most important method steps may be performed by such an apparatus.

In embodiments, a programmable logic device (eg, a field programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In embodiments, the field programmable gate array may work with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

Although the above has been described with reference to the preferred embodiments of the present invention, those skilled in the art will be able to variously modify and change the present invention within the scope not departing from the spirit and scope of the present invention described in the following claims. You will understand that you can.

130: Supply power circuit (SPC)
140: supply communication controller
150: supply device P2PS controller
200: electric vehicle device (EV device)
230: EV power circuit (EVPC)
240: EV communication controller (EVCC)
250: EV device P2PS controller

Claims (20)

A wireless power transmission control method performed by an electric vehicle device (EV device) receiving power from a power supply device,
Checking service details regarding a method of precise positioning and pairing between the power supply device and the electric vehicle device, and selecting a service;
Performing precise positioning with the power supply device according to a pairing method associated with a selected service;
Performing LF (Low Frequency) pairing according to the selected service;
Performing an initial alignment check using pre-charging power transmission; And
And performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing the initial alignment check. The method according to claim 1,
Performing an initial alignment check using the precharge power transmission,
A wireless power transfer control method comprising the step of determining whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on the pre-charged power received from the power supply device. The method according to claim 2,
The step of determining whether to renegotiate WPT precision positioning based on the pre-charge power,
Determining whether a minimum power transfer efficiency of the pre-charged power is equal to or greater than a reference value;
Determining that misalignment has occurred when the minimum power transmission efficiency is less than the reference value; And
In accordance with the occurrence of misalignment, determining the performance of WPT fine positioning renegotiation. The method according to claim 1,
The service discovery response message provided by the power supply device to check the service details includes a parameter indicating whether service renegotiation is possible. The method of claim 4,
Re-negotiation of the service above,
During charging, triggered through a charging loop message by the power supply device or a power delivery request (PowerDeliveryReq) message by the electric vehicle device. The method of claim 4,
Re-negotiation of the service above,
Triggered when the power supply device and the EV device wake up from a charging pause period. The method according to claim 2,
According to the decision to perform the WPT precision positioning renegotiation,
Checking the service details and selecting a service, performing the precise positioning, and performing the LF pairing again. The method according to claim 1,
After the step of performing the LF pairing,
Further comprising performing authentication between the electric vehicle device and the power supply device. The method of claim 3,
The step of performing Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check is performed when the minimum power transmission efficiency is greater than or equal to a reference value. As a power transmission control device of an electric vehicle device (EV device),
An EV power circuit for receiving power provided by a power supply device;
Processor; And
Includes a memory for storing at least one instruction executed through the processor,
The at least one command,
A command for checking service details and selecting a service regarding a method for precise positioning and pairing for wireless power transmission between the power supply device and the electric vehicle device;
Instructions for performing fine positioning according to the fine positioning and pairing method associated with the selected service;
A command to perform LF (Low Frequency) pairing according to the selected service;
A command to perform an initial alignment check using pre-charging power transmission; And
And a command to perform Low Power Excitation (LPE) pairing according to the selected service and the result of performing the initial alignment check. The method of claim 10,
An EV communication controller (EVCC) in communication with the power supply device using wireless communication; And
An EV device P2PS (Point to Point Signal) controller for forming a P2PS connection with the power supply device by using a low frequency (LF) signal. The method of claim 10,
The service discovery response message provided by the power supply device to check the service details includes a parameter indicating whether service renegotiation is possible. The method of claim 12,
Re-negotiation of the service above,
Triggered by the power supply device or the electric vehicle device during charging, or triggered when the power supply device and the EV device wake up from a charging pause period. The method of claim 10,
The command to perform an initial alignment check using the precharge power transmission,
And a command to determine whether to renegotiate WPT (Wireless Power Transfer) precision positioning based on the pre-charged power received from the power supply device. The method of claim 14,
The command to determine whether to renegotiate WPT precision positioning based on the pre-charge power,
A command for determining whether a minimum power transfer efficiency of the pre-charged power is equal to or greater than a reference value;
An instruction for determining that misalignment has occurred when the minimum power transmission efficiency is less than the reference value; And
In accordance with the occurrence of misalignment, the power transmission control device comprising an instruction to determine the execution of WPT precision positioning renegotiation. The method of claim 14,
The processor,
According to the determination of performing the WPT fine positioning renegotiation, a command for checking the service details and selecting a service, a command for performing the fine positioning and a command for performing the LF pairing are re-executed. As a wireless power transmission method performed by a power supply device (supply device) supplying power to an electric vehicle device (EV Device),
Checking a service status for a precise positioning and pairing method in response to a request for checking service details from the electric vehicle device, and sending a reply to the electric vehicle device;
Performing precision positioning with the electric vehicle device according to a precision positioning and pairing method associated with a service selected by the electric vehicle device;
Performing LF (Low Frequency) pairing according to the selected service;
Transmitting pre-charging power to be used for initial alignment check to the electric vehicle device;
Performing LPE (Low Power Excitation) pairing according to the selected service and a result of performing an initial alignment check; And
Delivering power to the electric vehicle device. The method of claim 17,
A wireless power transfer method, wherein whether or not to renegotiate WPT (Wireless Power Transfer) precision positioning is determined by the electric vehicle device based on the pre-charged power. The method of claim 18,
According to the decision to perform WPT precision positioning renegotiation,
Re-performing the step of checking and replying to the service state, performing the precise positioning, and performing the LF pairing, wireless power transmission method. The method of claim 17,
The service discovery response message provided by the power supply device for checking the service details includes a parameter indicating whether service renegotiation is possible,
The service renegotiation is triggered by the power supply device or the electric vehicle device during charging, or triggered when the power supply device and the EV device wake up from a charging pause period.

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