KR20180003995A - Method for trasfering wireless power for electric vehicle based on auxiliary battery status and apparatus for the same - Google Patents

Abstract

Disclosed is a wireless charging method based on an auxiliary battery state performed in an electric vehicle wireless charging system. The wireless charging method based on an auxiliary battery state of the present invention comprises the steps of: receiving, by an electric vehicle charging device, a wireless jump request message from a user terminal; transmitting, by the electric vehicle charging device, a primary jump power in response to the wireless jump request message to the electric vehicle; driving a reserve power supply device provided in the electric vehicle by a secondary jump power generated by receiving, by the electric vehicle, the primary jump power; outputting, by the reserve power supply device, a preset power to drive a control system of the electric vehicle; and charging an auxiliary battery by the control system of the electric vehicle. Therefore, even when the auxiliary battery is discharged, the control system of the vehicle can be driven without a manual operation.

Description

TECHNICAL FIELD [0001] The present invention relates to a wireless power transmission method for an electric vehicle based on an auxiliary battery state, and an electric vehicle using the method.

The present invention relates to a wireless power transmission method for an electric vehicle based on an auxiliary battery state and an electric vehicle using the method. More particularly, the present invention relates to a wireless power transmission method for an electric vehicle, The present invention relates to a method for wirelessly charging a high-voltage battery of an electric vehicle and an electric vehicle.

Countries around the world, including Korea, are making efforts to develop and distribute electric cars.

Electric vehicles are eco-friendly because they do not generate carbon monoxide (CO) and carbon dioxide (CO ₂ ), which are the main causes of air pollution and warming, unlike conventional transportation methods using fossil fuels.

In particular, EVs are expected to help maximize power utilization and maximize the use of renewable energy in conjunction with a smart grid that optimizes energy efficiency.

In order to disseminate and utilize electric vehicles, researches on charging methods of electric vehicles are continuously carried out. One of such charging methods is a wireless charging method using electromagnetic induction phenomenon.

First of all, the electric charging of an electric car is performed by supplying power from an electric power grid to a charging coil connected to a charging station, Lt; / RTI > Then, it is general that the battery of the electric vehicle is supplied with power by the generated electromotive force.

However, existing electric vehicles use a secondary battery for driving an electric vehicle control system in addition to a high-voltage battery used as a main power supply.

At this time, when the auxiliary battery is discharged, the control system is disabled, so that the wireless charging can not be performed. For this reason, there has been a problem that the control system must be manually operated by using a wire jumper.

Therefore, even if the auxiliary battery is in a discharged state, there is a need for a method of operating the control system and performing wireless charging more conveniently without manual operation.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems and provide a wireless power transmission method capable of wirelessly charging an electric vehicle even when the auxiliary battery is discharged, .

It is another object of the present invention to solve the above problems and provide a method of controlling a charging controller of an electric vehicle in which, even when an auxiliary battery is discharged, And to provide an electric car for carrying out the method.

According to an aspect of the present invention, there is provided a wireless charging method based on an auxiliary battery state performed in an electric vehicle wireless charging system.

Here, the wireless charging method based on the auxiliary battery state performed in the electric vehicle wireless charging system includes a step of the electric vehicle charging device receiving the wireless jump request message from the user terminal, the step of charging the primary jump power according to the wireless jump request message, A step of driving a spare power supply device provided in an electric vehicle by a secondary jump power generated by receiving a first jump power to an electric vehicle, a step of outputting predetermined power to the spare power supply device, And charging the auxiliary battery with the control system of the electric vehicle.

Here, the wireless charging method includes a step in which the control system of the electric car transmits a wireless charging request message to the charging device of the electric car when charging of the auxiliary battery is completed, and a step in which the electric charging device transmits the wireless charging electric power according to the wireless charging request message to the electric vehicle Step < / RTI >

Here, the electric vehicle receives electric power from the electric vehicle charging device by electromagnetic coupling between the GA (Ground Assembly) coil of the electric vehicle charging device and the VA (Vehicle Assembly) coil of the electric vehicle, Lt; / RTI >

Here, the standby power supply may be a switched mode power supply (SMPS) that supplies a 12 V (volt) DC power supply to the control system.

Here, in the step of charging the auxiliary battery by the control system of the electric vehicle, the control system of the electric vehicle may turn off the auxiliary power supply device and charge the auxiliary battery with the high voltage battery that supplies the electric power energy of the electric vehicle.

Here, the step of charging the auxiliary battery by the control system of the electric vehicle converts the electric power of the high-voltage battery into the low-voltage direct current (DC) using a low-voltage DC converter (LDC) connected in parallel with the high- And the auxiliary battery can be charged using the converted power.

Here, the wireless charge request message may include the maximum DC power of the electric vehicle and the limit of voltage and current.

Here, the step of the electric vehicle charging apparatus receiving the wireless jump request message from the user terminal includes the step of performing the user authentication of the electric vehicle charging apparatus to the user terminal and the step of the electric vehicle charging apparatus exchanging the status information with the user terminal .

Here, the step of performing the user authentication for the user terminal by the electric vehicle charging device may include the step of authenticating the electric vehicle through the user terminal.

Here, the electric vehicle can transmit electric vehicle status information including whether the auxiliary battery is discharged through telematics with the user terminal.

According to an aspect of the present invention, there is provided an electric vehicle.

Here, the electric vehicle is a vehicle assembly coil that receives the primary electric power transmitted from the electric vehicle charging device and generates secondary electric power, the secondary electric power generated by the VA coil, and the electric power of the electric car A control module for controlling the communication module and for charging the high voltage battery using the electric power generated in the VA coil, a control system for controlling the communication module, And a spare power supply device that is driven by the secondary jump power and supplies power to the control system when the secondary jump power is generated in the VA coil by receiving the primary jump power from the auxiliary battery and the EV charging device can do.

Here, the control system controls the charging of the auxiliary battery when the power is supplied from the standby power supply device. When the charging of the auxiliary battery is completed, the control system requests the wireless charging power to the charging device of the electric vehicle, Can be used to charge the high voltage battery.

Here, the standby power supply device may be connected in parallel with the VA coil.

Here, the standby power supply may be a switched mode power supply (SMPS) that supplies a 12 V (volt) DC power supply to the control system.

Here, when the control system is powered by the backup power supply, the control system can turn off the backup power supply and charge the backup battery with the high voltage battery.

Here, the control system may convert the power of the high-voltage battery into low-voltage DC using a low-voltage DC converter (LDC) connected in parallel with the high-voltage battery, and charge the secondary battery using the converted power have.

Here, the communication module can transmit / receive a wireless charging control message including the maximum DC power of the electric vehicle and the limit of voltage and current to / from the electric vehicle charging device.

Here, the communication module may transmit electric vehicle status information including whether the auxiliary battery is discharged through telematics with a user terminal owned by the user of the electric vehicle.

According to an aspect of the present invention, there is provided a wireless charging method based on an auxiliary battery state in an electric vehicle equipped with a standby power supply.

Here, the wireless charging method includes a step of driving a standby power supply device provided in an electric vehicle by a secondary jump power generated by receiving a first jump power from an electric vehicle charging device, The control system of the electric car charges the auxiliary battery, and when the charging of the auxiliary battery is completed, the control system of the electric car transmits a wireless charging request message to the charging device of the electric car, And transmitting the wireless charging power according to the wireless charging request message to the electric vehicle.

Here, the standby power supply may be a switched mode power supply (SMPS) that supplies a 12 V (volt) DC power supply to the control system.

When the method and apparatus for wireless charging based on the state of the auxiliary battery according to the present invention as described above are used, the vehicle system can be easily operated even if the auxiliary battery is discharged.

Further, since the wired jumper is not used even if the auxiliary battery is discharged, there is an advantage that the user can conveniently and safely carry the vehicle system.

1 is a conceptual diagram of an electric vehicle wireless charging system according to an embodiment of the present invention.
2 is a summary diagram of an electric vehicle wireless charging circuit according to an embodiment of the present invention.
FIG. 3 is a conceptual diagram relating to vehicle alignment in wireless charging of an electric vehicle according to an embodiment of the present invention.
4 is a sequence diagram for explaining a wireless charging method based on an auxiliary battery state according to an embodiment of the present invention.
5 is a flowchart illustrating a wireless charging method based on an auxiliary battery state performed in an electric vehicle wireless charging system according to an embodiment of the present invention.
6 is a configuration diagram of an electric vehicle capable of performing a wireless power transmission method according to an embodiment of the present invention.
7 is a configuration diagram of a control system included in an electric vehicle according to an embodiment of the present invention.
FIG. 8 is a diagram illustrating an example of a circuit to which a wireless charging of an electric car according to an embodiment of the present invention can be applied.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, 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 this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

In an embodiment of the present invention, an electric vehicle charging system can be basically defined as a system for charging a battery mounted on an electric vehicle using a grid of a commercial power source or electric power of an energy storage device. Such an electric vehicle charging system may have various forms depending on the type of electric vehicle. For example, an electric vehicle charging system may include a conductive charging system using a cable or a non-contact wireless power transmission system.

In one embodiment of the present invention, an electric vehicle (EV) may refer to an automobile as defined in 49 CFR 523.3. The electric vehicle is freely available on the highway and can be driven by electricity supplied from an in-vehicle energy storage device such as a rechargeable battery from a power source outside the vehicle.

In one embodiment of the invention, the power source may include a residential or public electrical service or a generator using vehicle mounted fuel, and the like.

In one embodiment of the present invention, an electric vehicle (EV) is an electric car, an electric automobile, an electric road vehicle (ERV), a plug-in vehicle (PV), a plug- vehicle, etc., and the xEV may be referred to as a BEV (plug-in all-electric vehicle or battery electric vehicle), a plug-in electric vehicle (PEV), a hybrid electric vehicle (HEV), a hybrid plug- ), A plug-in hybrid electric vehicle (PHEV), and the like.

In one embodiment of the present invention, a Plug-in Electric Vehicle (PEV) may be referred to as an electric vehicle that is connected to a power grid and recharges a quantity-loaded primary battery. A plug-in vehicle (PV) may be referred to herein as a rechargeable vehicle through a wireless charging scheme without the use of physical plugs and sockets from 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).

In one embodiment of the present invention, a light duty plug-in electric vehicle is mainly a rechargeable battery for use in public streets, roads, and highways, or an electric motor powered by an electric motor of another energy device It can refer to a vehicle with three or four wheels. Lightweight plug-in electric vehicles may be specified to have a total weight less than 4.545 kg.

In one embodiment of the present invention, a wireless power charging system (WCS) may refer to a system for controlling between GA and VA, including wireless power transmission, alignment and communication. Wireless power transfer (WPT) can refer to the transmission of electrical power through contactless means to an electric vehicle in an AC power supply network, such as a utility or a grid.

In one embodiment of the present invention, a utility provides electrical energy and is typically implemented in a customer information system (CIS), an Advanced Metering Infrastructure (AMI), a Rates and Revenue system ≪ / RTI > and the like. The utility allows the plug-in electric vehicle to use energy through price tags or discrete events. The utility can also provide information on tariff rates, intervals for measured power consumption, and verification of electric vehicle programs for plug-in electric vehicles.

In one embodiment of the present invention, smart charging can be described as a system in which an EVSE and / or plug-in electric vehicle communicates a vehicle charge rate or discharge rate with a power grid to optimize the time of grid capacity or usage cost ratio. Automatic charging can be defined as the inductive charging operation of the vehicle in a proper position relative to the primary charger assembly capable of transmitting power. Automatic charging can be performed after obtaining the required authentication and authorization.

Interoperability in one embodiment of the invention may refer to a state in which components of the system relative to one another can operate together to perform the desired operation of the overall system. Information interoperability can refer to the ability of two or more networks, systems, devices, applications or components to share and easily use information securely and effectively, with little or no inconvenience to the user .

In one embodiment of the invention, an inductive charging system may refer to a system in which two parts transfer energy electronically in a forward direction from an electricity supply network to an electric vehicle via a loosely coupled transformer. In this embodiment, the induction charging system may correspond to the electric vehicle charging system. An inductive coupler may refer to a transformer that is formed of a GA coil and an VA coil and that transfers power through electrical isolation. Inductive coupling can refer to magnetic coupling between two coils. The two coils can refer to a ground assembly coil and a vehicle assembly coil.

In one embodiment of the present invention, the VA coil may be referred to as a secondary coil, a vehicle coil, a receiver coil, etc., and similarly a ground assembly coil (GA coil may be referred to as a primary coil, a transmit coil, or the like.

In one embodiment of the present invention, the GA may be referred to as a primary device (PD), a primary device, and the like, and VA may be referred to as a secondary device (SD) .

In one embodiment of the present invention, the primary device may be a device that provides contactless coupling to the secondary device, that is, a device external to the electric vehicle. The primary device may be referred to as a primary side device. When the electric vehicle receives power, the primary device can operate as a power source for transmitting power. The primary device may include a housing and all covers.

In one embodiment of the present invention, the secondary device may be an electric vehicle mounting device that provides contactless engagement with the primary device. The secondary device may be referred to as a secondary side device. When the electric vehicle receives electric power, the secondary device can transfer the electric power from the primary device to the electric car. The secondary device may include a housing and all covers.

In one embodiment of the present invention, the ground assembly controller (GA controller) may be part of a GA that adjusts the output power level for the GA coil based on information from the vehicle.

In one embodiment of the present invention, a vehicle controller (VA controller) may be part of a VA that monitors the parameters for a particular vehicle during charging and initiates communication with the GA to control the output power level.

The GA controller described above may be referred to as a primary device communication controller (PDCC), and the VA controller may be referred to as an electric vehicle communication controller (VA controller). The magnetic gap is the distance between the highest plane of the upper portion of the litz wire or the upper portion of the magnetic material of the GA coil and the lowest plane of the magnetic material of the VA coil, Vertical distance can be referred to.

Alignment in one embodiment of the present invention refers to a procedure for finding the relative location of the secondary device to the primary device and / or a procedure for finding the relative location of the primary device to the secondary device for the defined efficient power transfer . Alignment herein may refer to, but is not limited to, alignment of a wireless power transmission system.

In one embodiment of the invention, the vehicle magnetic ground clearance may refer to the vertical distance between the bottom floor of the Litz wire or the insulating material of the VA coil mounted on the vehicle and the road pavement. Vehicle Assembly (VA) The Vehicle Assembly Coil Surface Distance can refer to the vertical distance between the plane bottom of the Litz wire or the magnetic material of the VA coil and the lowest outer surface of the VA coil. Such a distance may include additional items wrapped in a protective cover and coil wrapper.

In one embodiment of the present invention, pairing may refer to a procedure in which a vehicle (electric vehicle) is associated with a single dedicated ground assembly (primary device) arranged to transmit power. Pairing herein may include a procedure for associating a charge spot or a specific ground assembly with a vehicle assembly controller. Correlation / Association may involve establishing a relationship between two peer communication entities. Command and control communication may refer to communication between an electric vehicle and an electric vehicle, which exchanges information necessary to initiate, control, and terminate the wireless power transfer process.

In one embodiment of the present invention, a high level communication may process all information that exceeds the information in the command and control communication. The data link of the high level communication can use PLC (Power line communication), but is not limited thereto. Low power excitation may refer to activating an electric vehicle to sense a primary device to perform precise positioning and pairing, but is not so limited, and vice versa.

In an embodiment of the present invention, a service set identifier (SSID) is a unique identifier consisting of 32-characters attached to a header of a packet transmitted on a wireless LAN. The SSID identifies the basic service set (BSS) that the wireless device attempts to connect to. SSID basically distinguishes several wireless LANs from each other. Therefore, all APs and all terminal / station devices that want to use a particular wireless LAN can use the same SSID. Devices that do not use a unique SSID are not able to join the BSS. Because the SSID is shown as plain text, it may not provide any security features to the network.

In one embodiment of the present invention, an ESSID (Extended Service Set Identifier) is a name of a network to be accessed. It is similar to SSID but can be a more extended concept. A basic service set identifier (BSSID) is usually used to distinguish a specific basic service set (BSS) by 48 bits. In the case of an infrastructure BSS network, the BSSID may be medium access control (MAC) of the AP equipment. For an independent BSS or ad hoc network, the BSSID can be generated with any value.

In one embodiment of the present invention, a charging station may include at least one ground assembly and at least one ground assembly controller that manages at least one ground assembly. The ground assembly may include at least one wireless communication device. The charging station may refer to a place having at least one ground assembly installed in a home, office, public place, road, parking lot, and the like.

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

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

1, a wireless power transmission may be performed by at least one component of an electric vehicle 10 and a charging station 13, and may be used to transmit power wirelessly to an electric vehicle 10, . ≪ / RTI >

Here, the electric vehicle 10 can be generally defined as a vehicle (automobile) that supplies electric current derived from a chargeable energy storage device such as the battery 12 as an energy source of an electric motor as a power device.

However, the electric vehicle 10 according to the present invention may include a hybrid vehicle having an electric motor and an internal combustion engine together, and may be a motor vehicle, a motorcycle, a cart, A scooter, and an electric bicycle.

The electric vehicle 10 may include a power receiving pad 11 including a receiving coil for charging the battery 12 wirelessly and may include a plug connection for charging the battery 12 by wire It is possible. At this time, the electric vehicle 10 capable of charging the battery 12 by wire can be referred to as a plug-in electric vehicle (PEV).

Here, the charging station 13 may be connected to a power grid 15 or a power backbone and may be connected to a power transmission line 14 through a power link, Or direct current (DC) power.

Also, the charging station 13 can communicate with an infrastructure management system or an infrastructure server that manages a power grid 15 or a power network through wired / wireless communication, and performs wireless communication with the electric vehicle 10 can do.

Here, the wireless communication may be Bluetooth, zigbee, cellular, wireless local area network, or the like.

In addition, for example, the charging station 13 can be located at various places such as a parking lot attached to the owner's house of the electric car 10, a parking area for charging an electric car at a gas station, a parking area at a shopping center or a workplace.

The process of wirelessly charging the battery 12 of the electric vehicle 10 is performed by first placing the power receiving pad 11 of the electric vehicle 10 in the energy field of the power transmitting pad 14, And the receiving coils of the receiving pads 11 are mutually interacted or coupled to each other. An electromotive force is induced in the power reception pad 11 as a result of the interaction or coupling, and the battery 12 can be charged by the induced electromotive force.

In addition, the charging station 13 and the transmission pad 14 may be referred to as a ground assembly (GA) in whole or in part, and the ground assembly may refer to the previously defined meaning.

In addition, all or a part of the internal components of the electric vehicle other than the receiving pad 11 of the electric vehicle 10 may be referred to as a vehicle assembly (VA), in which the vehicle assembly may refer to the previously defined meaning.

Here, the power transmission pad or the power receiving pad may be configured to be 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 an opposite pole in the outer periphery. Here, the flux can be formed to exit from the center of the pad and return at all outer boundaries of the pad.

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

2 is a conceptual diagram illustrating an electric vehicle wireless charging circuit according to an embodiment of the present invention.

Referring to FIG. 2, a schematic configuration of a circuit for charging in an electric car wireless charging system is shown.

2 can be interpreted as expressing all or part of the configuration of the power supply Vsrc supplied from the power grid, the charging station 13 in FIG. 1, and the transmission pad 14, and the right side of FIG. 2 The circuit may be interpreted as representing some or all of the electric vehicle including the receiving pad and the battery.

2 provides the output power Psrc corresponding to the power supply Vsrc supplied from the power network to the wireless charging power converter and the wireless charging power converter converts the output power Psrc corresponding to the power It is possible to output the frequency of the supplied power Psrc and the power P1 subjected to AC / DC conversion so as to emit an electromagnetic field.

Specifically, the wireless charging power converter includes an AC / DC converter for converting power Psrc supplied from the power network into DC power when AC power is AC power, and a low frequency converter (or LF A converter). The operating frequency may be determined to be, for example, between 80 and 90 kHz.

The power P ₁ output from the wireless charging power converter can again be supplied to the circuit consisting of the transmitting coil L ₁ , the first capacitor C ₁ and the first resistor R ₁ , C ₁ ) may be determined so as to have an element value such that it has an operating frequency suitable for charging together with the transmitting coil L ₁ . Here, the first resistor R ₁ may mean a power loss caused by the transmission coil L ₁ and the first capacitor C ₁ .

Here, the transmitting coil L ₁ may be electromagnetically coupled as defined by the receiving coil L ₂ and the coupling coefficient m to allow power to be transmitted, or power may be induced to the receiving coil L ₂ . Therefore, the meaning of power transmission in the present invention can be used in combination with the meaning that power is induced.

Here, the electric power P ₂ induced or transmitted to the receiving coil may be provided to the electric vehicle electric power converter. At this time, the second capacitor C ₂ may be determined as an element value having an operating frequency suitable for charging together with the receiving coil L ₂ , and the second resistor R ₂ may be determined as the receiving coil L ₂ and the second May mean a power loss caused by the capacitor C ₂ .

The electric vehicle power converter may include an LF / DC converter that converts the supplied power (P ₂ ) of a specific operating frequency to DC power having a voltage level suitable for the battery (V _HV ) of the electric vehicle.

When outputting the electric power converter to provide power received power (P _HV) converting the (P _2), the output power (P _HV) may be used for charging of the battery (V _HV) embedded in electric vehicle.

Here, the right circuit of FIG. 2 may further include a switch for selectively connecting or disconnecting the receiving coil L ₂ with the battery V _HV .

Here, the resonance frequencies of the transmission coil L ₁ and the reception coil L ₂ may be similar or identical to each other. The reception coil L ₂ may be connected to the electromagnetic field generated by the transmission coil L ₁ , Can be configured to be located in close proximity.

Here, the circuit of FIG. 2 should be understood as an exemplary circuit for power transmission in an electric vehicle wireless charging system that is available for embodiments of the present invention, and is not limited to the circuit in FIG.

On the other hand, since the power loss may increase as the transmitting coil L ₁ and the receiving coil L ₂ are located at a long distance, setting the positions of the transmitting coil L ₁ and the receiving coil L ₂ may be important factors.

At this time, the transmission coil L ₁ is included in the transmission pad 14 in FIG. 1 and the reception coil L ₂ can be included in the reception pad 11 in FIG. Therefore, positioning between the power transmission pad and the power reception pads or positioning between the power transmission pads and the power transmission pads will be described below with reference to the drawings.

3 is a conceptual diagram illustrating an alignment concept in wireless power transmission of an electric vehicle according to an embodiment of the present invention.

Referring to FIG. 3, a method of aligning the power transmission pad 14 and the electric power receiving pad 11 in the electric vehicle in FIG. 1 can be described. Here, the positional alignment may correspond to the alignment, which is the above-mentioned term, and thus may be defined as the alignment between the GA and the VA, and is not limited to the alignment of the transmission pad and the receiving pad.

3, the transmission pad 14 may be positioned above the ground surface, or may be positioned such that the top surface of the transmission pad 14 is exposed below the ground surface.

Further, the receiving pads 11 of the electric vehicle can be defined by different categories according to heights (defined in the z direction) measured on the basis of the ground surface. For example, the height of the receiving pads 11 on the ground surface is 100-150 (mm), class 2 for class 1, 140-210 (mm), and class 3 for class 170-250 (mm). At this time, only the class 1 may be supported according to the receiving pad 11, or the class 1 and 2 may be supported, and partial support may be possible.

Here, the height measured based on the ground surface may correspond to the above-mentioned term vehicle magnetic ground surface.

The position of the transmission pad 14 in the height direction (defined in the z direction) can be determined to be located between the maximum class and the minimum class supported by the power receiving pad 11. For example, It is possible to determine that the power transmission pad is positioned between 100 and 210 mm on the basis of the power receiving pad 11.

Further, the gap between the center of the power transmission pad 14 and the center of the power receiving pad 11 can be determined so as to be located within the limits of the horizontal and vertical directions (defined in the x and y directions). For example, it can be determined to be located within ± 75 (mm) in the horizontal direction (defined in the x direction) and to be located within ± 100 (mm) in the vertical direction (defined in the y direction).

Here, the relative positions of the power transmission pad 14 and the power reception pad 11 can be varied in accordance with their experimental results, and these values are to be understood as exemplary.

4 is a sequence diagram for explaining a wireless charging method based on an auxiliary battery state according to an embodiment of the present invention.

4, when the user of the electric vehicle 10 (or the driver) recognizes the discharge of the auxiliary battery, the user terminal 30 owned by the user of the electric vehicle 10 (or the driver) Device 20 may establish an intercommunication link (S400). The step of establishing the communication link may include the step of connecting the user terminal to the electric vehicle charging device 20 to perform the user authentication and the state of the user terminal 30 and the electric car charging device 20 And exchanging information. Here, the user authentication may include not only the user of the user terminal but also the authentication of the electric car 10 operated by the user.

The user terminal 30 may be a desktop computer, a laptop computer, a notebook, a smart phone, a tablet PC, a mobile phone, Such as a smart watch, a smart glass, an e-book reader, a portable multimedia player (PMP), a portable game machine, a navigation device, a digital camera, a digital multimedia broadcasting (DMB) A digital audio recorder, a digital audio player, a digital video recorder, a digital video player, a PDA (Personal Digital Assistant), and the like.

Here, the communication link setting corresponds to the pairing or association defined above, or can be understood as a corresponding meaning.

When the communication link between the user terminal 30 and the electric vehicle charging apparatus 20 is established, the user terminal 30 may transmit a wireless jump request message to the electric vehicle charging apparatus 20 (S405). The electric vehicle charging apparatus 20 can confirm whether the wireless jump power can be supplied or not (S410), and if the wireless jump power can be supplied, the message indicating that the wireless jump preparation is completed can be transmitted to the user terminal 30 S415).

Here, before the wireless jump request message is transmitted (S405), the electric vehicle 10 may be aligned to a permissible position where it can receive wireless jump power from the electric vehicle charging device. At this time, the allowable position may be a position that satisfies the condition described with reference to Fig.

Thereafter, the primary jump power may be transmitted to the electric vehicle 10 which has been confirmed or confirmed in the communication link setting (S400) (S420).

The primary jump power can be induced in the electric vehicle 10 by electromagnetic induction (S425). Then, a spare power supply device, which will be described later, mounted inside the electric vehicle 10 can be driven by the secondary jump power (S430). The driven standby power supply device may wake up the controller of the electric vehicle 10 (S435). The controller of the electric vehicle 10 may charge the auxiliary battery (S440). When charging of the auxiliary battery is completed, the electric vehicle 10 may transmit a message requesting wireless charging of the high-voltage battery to the electric vehicle charging apparatus 20 (S445). The electric vehicle charging apparatus 20 can transmit the wireless charging electric power for the high voltage battery to the electric car 10 (S450), and the electric car 10 can charge the high voltage battery with the electric power generated by receiving the wireless charging electric power (S455). Further, the electric vehicle charging apparatus 20 can transmit the charging state of the high-voltage battery to the user terminal 30. [

Here, the electric vehicle charging apparatus 20 may refer to all or a part of the charging station 13 and the transmission pad 14 according to FIG. For example, a device that communicates with the electric car 10 or controls the transmission pad 14 at the charging station 13 or the charging station 13 is referred to as SECC (Supply Equipment Communication Controller), and the transmission pad 14 ) Or a device built in the charging station 13 for controlling the output power of the transmission coil is referred to as a PDCC (Primary Device Communication Controller) as defined above. Therefore, the electric vehicle charging apparatus 20 can be defined as SECC or PDCC, or SECC or PDCC. Based on this definition, the following description may be given.

First, steps S400 to S420 will be described in detail as follows.

The communication link setting of the user terminal 30 and the electric vehicle charging apparatus 20 may include a communication link establishment between the user terminal and the SECC. When the communication link setting is completed, the user terminal 30 can transmit a message requesting the wireless jump to the SECC, and the SECC confirms whether or not the wireless jumping power transmission is available, and the wireless jumping power transmission to the user terminal 30 is ready A message indicating that the message has been sent. In addition, the SECC may request the PDCC to transmit the wireless jump power, so that the PDCC can transmit the wireless jump power to the EV 10. [

Next, steps S445 to S455 will be described in more detail. When charging of the auxiliary battery is completed, the electric car 10 can transmit a message requesting wireless charging of the high-voltage battery to the SECC, and SECC transmits the message of charging the high- It may request adjustment of the output for charge control.

The PDCC can adjust the voltage and frequency to correspond to the output adjustment request and transmit the wireless charging power to the electric car 10. [ When transmission of the wireless charging power is initiated or completed, the SECC may transmit to the user terminal 30 whether to initiate or complete wireless charging. In addition, the SECC may transmit a wireless charging progress state to the user terminal 30 while transmitting the wireless charging power.

5 is a flowchart illustrating a wireless charging method based on an auxiliary battery state performed in an electric vehicle wireless charging system according to an embodiment of the present invention.

Referring to FIG. 5, a step S500 of the electric vehicle charging apparatus receiving a wireless jump request message from a user terminal; (S510) the electric vehicle charging device transmits first jump power according to the wireless jump request message to the electric vehicle; A step S520 of driving a spare power supply device provided in the electric vehicle by the secondary jump power generated by receiving the primary jump power to the electric vehicle; A step (S530) of the preliminary power supply device to output a preset power to drive the control system of the electric vehicle; And a step S540 of charging the auxiliary battery by the control system of the electric vehicle.

Here, the wireless charging method includes the steps of: when the charging of the auxiliary battery is completed, the control system of the electric vehicle transmits a wireless charging request message to the electric vehicle charging device; Transmitting the high-voltage charging power according to the wireless charging request message to the electric vehicle; And charging the high voltage battery that supplies the electric power energy of the electric vehicle using the electric power generated in accordance with the wireless charging power of the electric vehicle.

Here, the electric vehicle receives electric power from the electric vehicle charging device by being electromagnetically coupled to a GA (Ground Assembly) coil of the electric vehicle charging device and a VA (Vehicle Assembly) coil of the electric vehicle, May be connected in parallel with the VA coil.

Here, the primary jump power can be set so that the power according to the rated voltage of the standby power supply device can be supplied by the generated secondary jump power, and thus can be set differently according to the type of the standby power supply device .

Here, the wireless charge request message may include the maximum DC power of the electric vehicle and the tolerance of voltage and current.

Here, the wireless charging power may have a predetermined value to be charged to the high voltage battery of the electric vehicle, and may be different from the primary jump power, but may be the same.

Here, the standby power supply may be a switched mode power supply (SMPS) that supplies 12 V (volts) of DC power to the control system.

Here, in the step of charging the auxiliary battery by the control system of the electric vehicle, the control system of the electric car may turn off the standby power supply and charge the auxiliary battery with the high voltage battery. Specifically, the power of the high-voltage battery is converted into a low-voltage direct current using a low-DC-DC converter (LDC) connected in parallel to the high-voltage battery, and the auxiliary battery is charged using the converted power have.

Here, the wireless jump request message may include the maximum DC power of the electric vehicle and the allowable values of voltage and current.

Here, the step of receiving the wireless jump request message from the user terminal of the electric vehicle charging device may include the steps of performing the user authentication of the electric vehicle charging device with respect to the user terminal and exchanging the status information with the user terminal .

The step of performing the user authentication of the user terminal by the electric vehicle charging device may include the step of the electric vehicle charging device authenticating the electric vehicle through the user terminal.

Here, the electric vehicle can transmit electric vehicle status information including whether the auxiliary battery is discharged through telematics with the user terminal.

6 is a configuration diagram of an electric vehicle capable of performing a wireless power transmission method according to an embodiment of the present invention.

Referring to FIG. 6, an electric vehicle 60 according to an embodiment of the present invention includes: a VA coil (Vehicle Assembly coil) 61 receiving a primary electric power transmitted from an electric vehicle charging device to generate secondary electric power; A high voltage battery (62) charged using the secondary power generated by the VA coil (61) and providing the electric power of the electric vehicle (60); A communication module (63) for communicating with the electric vehicle charging device to transmit and receive a message for controlling wireless charging of the electric vehicle (60); A controller (64) for controlling the communication module (63) and charging the high voltage battery (62) using power generated in the VA coil; An auxiliary battery (65) for supplying power to the control system (64); And a control unit (64) that is driven by the secondary jump power to supply power to the control system (64) when a primary jump power is received from the electric vehicle charging apparatus and a secondary jump power is generated in the VA coil And may include a feeder 66.

The controller 64 controls the charging of the auxiliary battery 65 when the power is supplied from the standby power supply unit 66. When the charging of the auxiliary battery 65 is completed, The high voltage battery 62 can be charged using the power generated in the VA coil 61 by requesting the wireless charging power from the charging device.

The spare power supply 66 may be connected to the VA coil 61 in parallel.

Here, the standby power supply 66 may be a switched mode power supply (SMPS) that supplies 12 V (volts) of DC power to the control system 64.

When the controller 64 receives power from the standby power supply 66, the controller 64 turns off the standby power supply 66 and supplies the auxiliary battery 65 with the high- Can be charged.

The control system 64 converts the power of the high-voltage battery 62 into a low-voltage DC using a low DC-DC converter (LDC) connected in parallel to the high-voltage battery 62, And the auxiliary battery 65 can be charged using the converted power.

Here, the communication module 63 may transmit and receive a wireless charging control message including the maximum DC power of the electric vehicle, the limit of the voltage and the current, to the electric vehicle charging device.

Here, the communication module 63 may transmit electric vehicle status information including whether or not the auxiliary battery 65 is discharged through a user terminal owned by the user of the electric vehicle and a telematics device.

7 is a block diagram of a controller included in an electric vehicle according to an embodiment of the present invention.

Referring to Figure 7, the controller 64 may include at least one processor 70 and a memory 71 for storing instructions configured to cause the at least one processor to perform an operating procedure of the control system according to Figure 6 have.

Here, the controller 64 may further include an input / output interface 72 for receiving input from a user or displaying control information to the user. For example, the input / output interface 72 may refer to a touch screen, a display device, or the like that receives input from a user.

Here, the controller 64 may be implemented in a vehicle control unit (VCU), a battery management system (BMS), or a BMS.

8 is a conceptual diagram showing a configuration of a wireless power system according to an embodiment of the present invention.

8, the SECC 80 includes a power supply and receives power from the power grid to deliver the power to the PDCC 81. The PDCC 81 includes a PFC (Power Factor Corrector) and an inverter And a transmit coil that can reduce power loss and output a power factor corrected signal by reducing the harmonic content in the current of the AC power delivered from the SECC 80. [ The inverter can adjust the voltage level to suit the vehicle's battery charge. In addition, the inverter can adjust the voltage level differently depending on whether the electric power to be transmitted to the electric vehicle is the jump power or the wireless charge power.

The electric power transmitted from the PDCC 81 generates an induced electromotive force in the receiving coil in the charging circuit 82 of the electric car and the generated electromotive force is supplied to the high voltage battery 83, .

The power of the high voltage battery may be converted to a low voltage direct current by a low voltage DC converter (LDC) 84 connected in parallel with the high voltage battery 83 and may be supplied to the auxiliary battery 85.

In addition, the auxiliary battery 85 can supply power to the control system 86. [

The control system 86 controls the charging circuit 82 to charge the high voltage battery 83 and controls the low voltage DC converter 84 to charge the auxiliary battery 85 using the high voltage battery 83 Can be performed.

In this case, the standby power supply device 87 is configured in parallel with the receiving coil of the charging circuit 82, and the auxiliary battery 85 is supplied from the PDCC 81 It can be implemented to be driven by the jump power.

When the standby power supply 87 is driven, it is able to supply power to the control system 86, and more particularly 12V DC power. At this time, the standby power supply device may be an SMPS.

The control system 86 can be driven by the spare power supply 87 and the control system 86 controls the low voltage DC converter 84 to supply the auxiliary battery 85 with the high voltage battery 83 ) Can be performed.

The control system 86 may again communicate with the SECC to request the SECC 80 for the wireless charging power for charging the high voltage battery 83 and the SECC 80 may communicate with the PDCC The charging of the high-voltage battery 83 can be performed by transmitting the wireless charging power to the charging device 81.

The methods according to the present invention can be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, and the like, alone or in combination. The program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention or may be available to those skilled in the computer software.

Examples of computer-readable media include hardware devices that are specially configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions may include machine language code such as those produced by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like. The hardware devices described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

Furthermore, the above-mentioned method or apparatus may be implemented by combining all or a part of the structure or function, or may be implemented separately.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Claims (20)

In a wireless charging method based on an auxiliary battery condition performed in an electric vehicle wireless charging system,
The electric vehicle charging device receiving a wireless jump request message from a user terminal;
The electric vehicle charging apparatus transmitting the first jump power according to the wireless jump request message to the electric vehicle;
Driving a standby power supply device provided in the electric vehicle by a secondary jump power generated by receiving the primary jump power to the electric vehicle;
Driving the control system of the electric vehicle by outputting a preset electric power; And
Wherein the control system of the electric vehicle includes charging the auxiliary battery. In claim 1,
The control system of the electric vehicle transmits a wireless charging request message to the electric vehicle charging apparatus when charging of the auxiliary battery is completed; And
Further comprising transmitting the wireless charging power according to the wireless charging request message to the electric vehicle by the electric vehicle charging device. In claim 1,
The electric vehicle includes:
(GA) coil of the electric vehicle charging device and a VA (Vehicle Assembly) coil of the electric vehicle are electromagnetically coupled to each other to receive electric power from the electric vehicle charging device,
Wherein the standby power supply is connected in parallel with the VA coil. In claim 1,
The standby power supply apparatus includes:
A switched-mode power supply (SMPS) that supplies 12 V (volts) of DC power to the control system. In claim 1,
The charging of the auxiliary battery by the control system of the electric vehicle may include:
Wherein the control system of the electric vehicle turns off the backup power supply device and charges the backup battery with a high voltage battery that supplies electric power energy of the electric vehicle. In claim 5,
The charging of the auxiliary battery by the control system of the electric vehicle may include:
The control system of the electric vehicle converts power of the high-voltage battery into low-voltage direct current (DC) using a low-DC-DC converter (LDC) connected in parallel with the high-voltage battery, A method of wireless charging based on secondary battery status. In claim 1,
Wherein the wireless charging request message comprises a maximum DC power of the electric vehicle and a limit of voltage and current. In claim 1,
Wherein the step of receiving the wireless jump request message from the user terminal comprises:
Performing the user authentication on the user terminal by the electric vehicle charging device; And
And the electric vehicle charging device exchanges state information with the user terminal. In claim 8,
Wherein the step of performing user authentication on the user terminal comprises:
And the electric vehicle charging device authenticating the electric vehicle through the user terminal. In claim 1,
The electric vehicle includes:
And transmits electric vehicle status information including whether the auxiliary battery is discharged through telematics with the user terminal. A VA coil (Vehicle Assembly coil) for receiving the primary power transmitted from the electric vehicle charging device to generate secondary power;
A high voltage battery that is charged using the secondary power generated by the VA coil and provides electrical power to the electric vehicle;
A communication module for communicating with the electric vehicle charging device to transmit and receive a message for controlling wireless charging of the electric vehicle;
A control system for controlling the communication module and charging the high-voltage battery using power generated in the VA coil;
An auxiliary battery for supplying power to the control system; And
And a standby power supply device that is driven by the secondary jump power to supply power to the control system when a primary jump power is received from the electric vehicle charging device and secondary jump power is generated in the VA coil. In claim 11,
The control system includes:
Wherein the control unit controls charging of the auxiliary battery when the power is supplied from the standby power supply unit and requests the wireless charging power to the electric vehicle charging apparatus when charging of the auxiliary battery is completed, Voltage battery by using the high-voltage battery. In claim 11,
The standby power supply apparatus includes:
And is connected in parallel with the VA coil. In claim 11,
The standby power supply apparatus includes:
And a switched mode power supply (SMPS) that supplies 12 V (volts) of DC power to the control system. In claim 11,
The control system includes:
Wherein when the power is supplied from the standby power supply apparatus, the standby power supply apparatus is turned off and the auxiliary battery is charged with the high voltage battery. In claim 15,
The control system includes:
Voltage battery to a low-voltage direct current (DC) using a low-voltage DC converter (LDC) connected in parallel with the high-voltage battery, and charges the auxiliary battery using the converted electric power. In claim 11,
The communication module includes:
And a wireless charging control message including a maximum DC power of the electric vehicle and a limit value of voltage and current to / from the electric vehicle charging device. In claim 11,
The communication module includes:
And transmits electric vehicle state information including whether the auxiliary battery is discharged through telematics with a user terminal owned by a user of the electric vehicle. In a wireless charging method based on the auxiliary battery condition in an electric vehicle equipped with a redundant power supply,
Driving a standby power supply device provided in an electric vehicle by secondary jump power generated by receiving a primary jump power from an electric vehicle charging device;
Driving the control system of the electric vehicle by outputting a preset electric power; And
Charging the auxiliary battery by the control system of the electric vehicle;
The control system of the electric vehicle transmits a wireless charging request message to the electric vehicle charging apparatus when charging of the auxiliary battery is completed; And
And transmitting the wireless charging power according to the wireless charging request message to the electric vehicle. In claim 19,
The standby power supply apparatus includes:
A switched-mode power supply (SMPS) that supplies 12 V (volts) of DC power to the control system.

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