KR102543310B1 - Charging device for vehicle, vehicle and controlling method for the vehicle - Google Patents

Abstract

A vehicle charging device includes a coil for transmitting first wireless power, a sound wave receiver for receiving a sound wave generated by the first wireless power, and a control unit for analyzing a frequency spectrum of a sound wave and distinguishing a chargeable terminal from foreign substances, When determined as a chargeable terminal, controls the coil to transmit second wireless power for wireless charging of the terminal.

Description

Vehicle charging device, vehicle and vehicle control method {CHARGING DEVICE FOR VEHICLE, VEHICLE AND CONTROLLING METHOD FOR THE VEHICLE}

It relates to a vehicle charging device, a vehicle including the same, and a method for controlling the vehicle.

In general, most electronic devices require charging, and these electronic devices include various types of wired terminals.

As an electrical connection method between a battery pack and a charging device that charges the battery pack embedded in such an electronic device, it receives commercial power and converts it into voltage and current corresponding to the battery pack to the battery pack through the terminal of the electronic device. There is a terminal connection method that supplies power. This terminal connection method requires a wire connecting the charging device and the electronic device, and also requires a user's action to connect the wire.

In order to overcome this inconvenience, wireless charging technology that does not require wires is rapidly developing, and a vehicle charging device for wirelessly charging electronic devices inside the vehicle is being mounted inside the vehicle.

As such, when the vehicle charging device is mounted inside the vehicle, the driver can easily charge the electronic device just by placing an electronic device capable of wireless charging near the vehicle charging device. In addition to the intended electronic device, there are various foreign substances, and the vehicle charging device may mistakenly recognize these foreign substances as electronic devices.

A charging device that determines whether wireless power is transmitted by distinguishing an electronic device capable of wireless charging and a foreign object, and transmits wireless power to an electronic device capable of wireless charging, a vehicle including the same, and a control method of the vehicle including the same want to provide

A vehicle charging device according to an aspect includes a coil for transmitting first wireless power; a sound wave receiving unit receiving sound waves generated by the first wireless power; and a control unit that analyzes the frequency spectrum of sound waves to distinguish between a chargeable terminal and a foreign substance, wherein the control unit controls the coil to transmit second wireless power for wireless charging of the terminal when the terminal is determined to be a chargeable terminal.

The coil may transmit one or more short pulses as the first wireless power.

There are a plurality of coils, and each coil can sequentially transmit short pulses with a mutual time difference.

The controller may determine that the terminal is chargeable when the magnitude of the sound wave is greater than or equal to a preset reference value in the first preset frequency band and less than the reference value in frequency bands other than the first frequency band.

The control unit may determine that the terminal is chargeable when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset first frequency band and less than a preset reference value in a preset second frequency band.

The second frequency band may be an audible frequency band between 20Hz and 10kHz.

The control unit may determine that the terminal is chargeable when the amplitude of sound waves in all frequency bands receivable by the sound wave receiver is less than a preset reference value.

If the size of the sound wave is greater than or equal to a preset reference value in a preset frequency band, the controller may determine it as a foreign substance.

The preset frequency band may be an audible frequency band of 20 Hz or more and less than 10 kHz.

The controller may determine that the sound wave receiver has a foreign substance when the sound wave size is greater than or equal to a preset reference value in all frequency bands receivable by the sound wave receiver.

The controller may repeatedly transmit the second wireless power when the coil receives response power from the terminal, but may stop transmitting the second wireless power when the coil does not receive response power from the terminal.

The vehicle includes a coil that transmits first wireless power; a sound wave receiving unit receiving sound waves generated by the first wireless power; and a control unit that analyzes the frequency spectrum of sound waves to distinguish between a chargeable terminal and a foreign substance, wherein the control unit controls the coil to transmit second wireless power for wireless charging of the terminal when the terminal is determined to be a chargeable terminal.

The coil may transmit one or more short pulses as the first wireless power.

The vehicle control method includes transmitting first wireless power; Receiving a sound wave generated by the first wireless power; Analyzing the frequency spectrum of sound waves to classify a rechargeable terminal and a foreign substance; and transmitting second wireless power for wireless charging of the terminal when the terminal is determined to be a chargeable terminal.

Transmitting the first wireless power may include transmitting one or more short pulses as the first wireless power.

Transmitting the first wireless power may include sequentially transmitting a plurality of short pulses with a mutual time difference.

The distinguishing step may include determining that the terminal is capable of charging when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset first frequency band and less than a reference value in a frequency band other than the first frequency band.

The distinguishing step may include determining the terminal as a chargeable terminal when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset first frequency band and less than a preset reference value in a preset second frequency band.

In the step of classifying, when the size of the sound wave is greater than or equal to a preset reference value in a preset frequency band, it may be determined as a foreign substance.

The preset frequency band may be an audible frequency band of 20 Hz or more and less than 10 kHz.

According to the vehicle charging device, vehicle, and vehicle control method according to the disclosed embodiments, the vehicle charging device can transmit wireless power only to electronic devices capable of wireless charging, thereby reducing power waste due to wireless power transmission to foreign substances. there is.

In addition, according to the vehicle charging device, the vehicle, and the vehicle control method according to the disclosed embodiment, the vehicle charging device incorrectly recognizes a foreign object as an electronic device capable of wireless charging and wirelessly transmits power to the foreign object, which may occur in the vehicle charging device. Possible heat problem can be solved.

1 is an external view of a vehicle according to an exemplary embodiment.
2 is a diagram illustrating an internal configuration of a vehicle according to an exemplary embodiment.
3 is a diagram showing the structure of a transmission coil and a reception coil included in a vehicle charging device and a terminal, and a direction of a magnetic field in this structure.
4 is an exemplary diagram of a vehicle charging device.
5 is a control block diagram of a charging device according to an embodiment.
6 is a flowchart of a control method of a charging device according to an embodiment.
7 is a conceptual diagram for explaining a first wireless power and sound wave transmission/reception process between a charging device and a terminal according to an embodiment.
8 is a conceptual diagram illustrating a first wireless power and sound wave transmission/reception process between a charging device and a foreign object according to an embodiment.
9 is various exemplary diagrams of a frequency spectrum of a sound wave received by a terminal.

Objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In adding reference numerals to components of each drawing in this specification, it should be noted that the same components have the same numbers as much as possible, even if they are displayed on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In this specification, terms such as first and second are used to distinguish one element from another element, and elements are not limited by the terms.

1 is an external view of a vehicle according to an exemplary embodiment, and FIG. 2 is a diagram illustrating an internal configuration of a vehicle according to an exemplary embodiment.

Referring to FIG. 1 , the exterior of a vehicle 100 according to an embodiment includes wheels 12 and 13 for moving the vehicle 100, a door 15L for shielding the inside of the vehicle 100 from the outside, and a vehicle 100 ) a windshield 16 providing a front view of the vehicle 100 to the driver inside, and side mirrors 14L and 14R providing a view to the rear of the vehicle 100 to the driver.

The wheels 12 and 13 include a front wheel 12 provided at the front of the vehicle and a rear wheel 13 provided at the rear of the vehicle, and a driving device (not shown) provided inside the vehicle 100 is ) provides rotational force to the front wheels 12 or rear wheels 13 to move forward or backward. Such a driving device may employ an engine that generates rotational force by burning fossil fuel or a motor that generates rotational force by receiving power from a capacitor.

Doors 15L and 15R (see FIG. 2) are provided to be pivotable on the left and right sides of the vehicle 100 so that a driver or passenger can get inside the vehicle 100 when opened, and when closed, the vehicle ( 100) is shielded from the outside. Also, handles 17L and 17R capable of opening and closing the doors 15L and 15R (see FIG. 2 ) may be provided outside the vehicle 100 .

The windshield 16 is provided on the front upper side of the body so that the driver inside the vehicle 100 can obtain visual information of the front of the vehicle 100, and is also referred to as a windshield glass.

In addition, the side mirrors 14L and 14R include a left side mirror 14L provided on the left side of the vehicle 100 and a right side mirror 14R provided on the right side of the vehicle 100, so that the driver inside the vehicle 100 can 100) to obtain side and rear visual information.

In addition, the vehicle 100 may include a sensing device such as a proximity sensor for detecting front, rear, or side obstacles or other vehicles, and a rain sensor for detecting whether or not there is precipitation and the amount of precipitation.

The proximity sensor may transmit a sensing signal to the front, rear, or side of the vehicle and receive a reflected signal reflected from an obstacle such as another vehicle. Based on the waveform of the received reflected signal, it is possible to detect the presence of an obstacle in front, rear, or side of the vehicle 100 and detect the position of the obstacle.

Referring to FIG. 2 , an AVN (Audio Video Navigation) display 71 and an AVN input unit 61 may be provided in a central area of the dashboard 29 . The AVN display 71 may selectively display at least one of an audio screen, a video screen, and a navigation screen, and may also display various control screens related to the vehicle 100 or screens related to additional functions. For example, the AVN display 71 is the front and rear of the vehicle 100. Alternatively, road conditions or obstacles on the side may be displayed as images.

The AVN display 71 may be implemented as a Liquid Crystal Display (LCD), Light Emitting Diode (LED), Plasma Display Panel (PDP), Organic Light Emitting Diode (OLED), Cathode Ray Tube (CRT), or the like.

The AVN input unit 61 may be provided as a hard key type in an area adjacent to the AVN display 71, or in the form of a touch panel on the front of the AVN display 71 when the AVN display 71 is implemented as a touch screen type. may be provided.

In addition, a jog shuttle type center input unit 62 may be provided between the driver's seat 18L and the passenger's seat 18R. The driver may input a control command by turning, pressing, or pushing the center input unit 62 up, down, left, or right.

A sound output unit 80 capable of outputting sound may be provided in the vehicle 100 , and the sound output unit 80 may be a speaker. The sound output unit 80 may output sound necessary for performing an audio function, a video function, a navigation function, and other additional functions.

In addition, a microphone 51 capable of receiving voice input may be provided in the vehicle 100 , and the microphone 51 may receive various voice commands of the driver for controlling the vehicle 100 . The location of the microphone 51 is not limited to that shown in FIG. 2 .

A steering wheel 31 is provided on the dashboard 29 on the driver's seat 18L side.

The vehicle 100 according to an embodiment includes a vehicle charging device 50, and the vehicle charging device 50 is positioned between a driver's seat 18L and a front passenger's seat 18R of the vehicle 100, as shown in FIG. 2 . It may be provided on the center console 40 provided in, but is not necessarily limited thereto, and may be provided in various places such as the doors 15L and 15R of the vehicle 100.

Although the vehicle charging device 50 according to an embodiment is described as being implemented as a wireless charging device, it is also possible to perform wired charging by further including a terminal and being connected to a terminal in a terminal connection method.

A detailed description of the vehicle charging device 50 will be described later.

Meanwhile, the vehicle 100 is equipped with an air conditioner to perform both heating and cooling, and the heated or cooled air can be discharged through the vent 21 to control the temperature inside the vehicle 100 .

Hereinafter, the structure and principle of the vehicle charging device 50 according to an embodiment will be described with reference to FIGS. 3 and 4 . 3 is a diagram showing the structure of a transmission coil and a reception coil included in a vehicle charging device and a terminal, and a direction of a magnetic field in this structure, and FIG. 4 is an exemplary view of the vehicle charging device. The terminal means an electronic device that can be wirelessly charged by the vehicle charging device 50 .

The vehicle charging device 50 may employ at least one of a magnetic induction method, a magnetic resonance method, and a microwave method as a wireless charging method.

Referring to FIG. 3 , the vehicle charging device 50 includes a transmission coil co1 for transmitting wireless power to a terminal ob1, and when a current is supplied to the transmission coil co1, an electromagnetic induction phenomenon occurs. An electromagnetic field is generated around the transmission coil co1. When the terminal ob1 approaches such an electromagnetic field, an induced current is generated in the receiving coil co2 included in the terminal ob1, and the terminal ob1 is charged by the induced current. The terminal ob1 may include a coil that receives wireless power from the vehicle charging device 50 to enable wireless charging and a battery pack (not shown) that stores the received wireless power.

The terminal ob1 may also transmit wireless power to the vehicle charging device 50 using the same principle as the vehicle charging device 50, and in this case, the coil of the wireless charging device becomes the receiving coil co2, and the terminal ob1 ) becomes the transmission coil co1.

Referring to FIG. 4 , the vehicle charging device 50 may be provided on the center console 40 as described above, and the center console 40 may place simple objects possessed by occupants using the vehicle 100 or It is used as a storage space. Here, the occupants include not only the driver but also the passengers inside the vehicle 100 .

In this case, other objects of the occupant (hereinafter referred to as "foreign substances") other than the terminal ob1 may be placed around the vehicle charging device 50, and the vehicle charging device 50 may remove the foreign objects from the terminal ob1. ), and there may be waste in transmitting wireless power. Here, the surrounding refers to a wireless power transmission range of the coil 52 .

Therefore, in order to solve this problem, the vehicle charging device 50 according to an embodiment includes components for distinguishing the terminal ob1 from foreign substances and transmitting wireless power to the terminal ob1 capable of charging.

5 is a control block diagram of a charging device according to an embodiment.

Referring to FIG. 5 , a vehicle charging device 50 according to an embodiment includes a sound wave receiver 51, a coil 52, a wireless power transmitter 53, and a control unit 54, and a storage unit 55 It may further include, but the storage unit 55 may be omitted.

The sound wave receiver 51 may be provided around the coil 52 to receive a sound wave reflected from an object placed around the coil 52, and may be implemented as a microphone. The sound wave receiver 51 may be the microphone 51 described with reference to FIG. 2, but is not necessarily limited thereto.

The sound wave receiver 51 detects sound waves and converts vibrations caused by sound waves into electrical signals. Here, the sound waves include not only sound waves in the audible frequency band (20 to 20,000 Hz), but also infrasonic band sound waves of 20 Hz or less and ultrasonic band sound waves of 20,000 Hz or more, and the sound wave receiver 51 receives sound waves according to performance. The frequency band can be different.

The coil 52 may function as the transmission coil co1 shown in FIG. 3 to transmit wireless power by forming an electromagnetic field around it based on the power signal of the wireless power transmitter 53 . Specifically, the coil 52 transmits the first wireless power to the surroundings based on the first power signal generated by the first transmission unit 53a of the wireless power transmission unit 53a, and transmits the first wireless power generated by the second transmission unit 53a. The second wireless power is transmitted to surroundings based on the second power signal.

The first wireless power refers to at least one short pulse with a short transmission time transmitted to detect a surrounding object, and the second wireless power is transmitted continuously to charge an object or has a longer transmission time than the first wireless power. means long pulse. The second wireless power may be transmitted not only to charge the object, but also to check a protocol (eg, A4WP, WPC, PMA, etc.) supported by the object. Here, the surrounding may be a wireless power transmission range of the coil 52 .

The coil 25 may transmit one or more short pulses having a short transmission time with a preset time difference as the first wireless power.

In addition, a plurality of coils 52 (52a-52c) may be provided. When a plurality of coils 52 are provided, each of the coils 52a to 52c may sequentially transmit the first wireless power with a preset time difference.

For example, the coil 52 may transmit pulses for a short time of 65 ms as first wireless power. When a plurality of coils 52a to 52c are provided, the first to third coils 52a to 52c are Pulses may be transmitted sequentially, but pulses may be transmitted at intervals of 30 ms from each other.

In addition, the coil 52 may continuously transmit pulses as the second wireless power, and when the plurality of coils 52a to 52c are provided, the plurality of coils 52a to 52c simultaneously transmit the second wireless power. can

In addition, the coil 52 functions as the receiving coil co2 shown in FIG. 3 and can receive wireless power from the terminal ob1. Hereinafter, the wireless power received from the terminal ob1 is referred to as response power.

The wireless power transmitter 53 generates a power signal so that an electromagnetic induction phenomenon occurs in the coil 52 based on a control signal of the control unit 54 .

The wireless power transmitter 53 includes a first transmitter 53a for generating a first power signal corresponding to the first wireless power and a second transmitter 53b for generating a second power signal corresponding to the second wireless power. can do.

The first power signal may be current supplied to the coil 52 so that the first wireless power in short pulses is transmitted to the surroundings, and the second power signal is continuous or has a pulse longer than the first wireless power. It may be the current supplied to the coil 52 to be transmitted to the surroundings.

The first transmission unit 53a and the second transmission unit 53b may include at least one of a WPC module and a PMA module that generate a power signal by a magnetic induction method according to a supported protocol, and an A4WP module that generates a power signal by a magnetic resonance method. can be implemented as one.

One embodiment has been described as having the first transmission unit 53a and the second transmission unit 53b provided separately, but the first transmission unit 53a and the second transmission unit 53b are combined in a single form to form a single module. A first power signal and a second power signal may be generated.

The controller 54 generates control signals for controlling each component of the vehicle charging device 50 .

The control unit 54 includes a processor that generates control signals according to the programs and data stored in the storage unit 55 .

The storage unit 55 includes a memory in which programs and data for controlling the vehicle charging device 50 are stored. Data generated by the control unit 55 may be stored in the storage unit 55 .

The storage unit 55 and the control unit 54 may be combined as a single module as well as provided as separate modules.

Hereinafter, referring to FIG. 6 , a method of controlling each component of the vehicle charging device 50 by the control unit 54 of the vehicle charging device 50 according to an embodiment will be described. 6 is a flowchart of a control method of a charging device according to an embodiment.

The controller 54 according to an embodiment controls the first transmitter 53a of the wireless power transmitter 53 so that the coil 52 transmits the first wireless power (1111).

For example, the control unit 54 may control the first transmission unit 53a to transmit the first wireless power when the power of the vehicle charging device 50 is turned on, and when charging is stopped, the first transmission unit 53a ) may be controlled to automatically transmit the first wireless power after a preset time.

The first wireless power is wireless power having a short pulse and generates sound waves when colliding with an object. In this case, when the first wireless power collides with the foreign object, noise is generated and tinnitus appears in the surroundings. However, when the rechargeable terminal ob1 collides with the first wireless power, the tinnitus does not occur.

Accordingly, when the sound wave receiving unit 51 receives sound waves around the coil 54 (1112), the control unit 54 analyzes the frequency spectrum of the sound wave based on the electrical signal generated by the sound wave receiving unit 51 (1113). As a result, it is determined whether the tinnitus phenomenon has occurred due to the first wireless power transmission, and it is determined whether the object is a non-rechargeable foreign substance or a chargeable terminal ob1. A detailed description of the process 1113 of the controller 54 analyzing the frequency spectrum of the sound wave will be described later.

Subsequently, the controller 54 stops charging (1118) when it is determined that a foreign substance that cannot be charged is present in the vicinity as a result of the frequency spectrum analysis (1113, “not charging”).

Here, stopping charging (1118) includes not proceeding with further processing until there is a separate wireless charging command from the occupant.

Further, stopping charging ( 1118 ) includes stopping transmission of the second wireless power when the second wireless power is already being transmitted.

Also, stopping charging (1118) includes controlling the first transmission unit 53a to transmit the first wireless power again when a preset retransmission time elapses (1111).

In this way, the vehicle charging device 50 can distinguish the terminal ob1 and the foreign substance simply by transmitting the first wireless power having a short pulse and analyzing the frequency spectrum of the sound wave, and for the foreign substance, the second wireless power is no longer detected. Since power does not need to be transmitted, unnecessary power consumption can be reduced.

However, when the terminal ob1 is detected ("Chargeable" in 1113), the control unit 54 configures the second transmission unit 53b of the wireless power transmission unit 53 so that the coil 52 transmits the second wireless power. Control (1114).

The second wireless power includes a Ping (Packet Internet Grouper) signal for checking whether the terminal ob1 supports the same protocol as the vehicle charging device 50 .

In addition, the second wireless power is wireless power having a longer pulse than the first wireless power, and may perform a function of charging the terminal ob1.

Subsequently, the control unit 54 determines whether the coil 52 has received response power from the terminal ob1 (1115), and if the coil 52 has not received the response power (“No” in 1115), Upon determining that the terminal ob1 does not support the protocol supported by the vehicle charging device 50 or does not want to charge any more, the charging is stopped (1118).

However, when the coil 52 receives the response power (YES in 1115), the controller 54 compares the response power with the transmitted second wireless power (1116).

Specifically, the controller 54 determines that the response power is weak when the difference between the second wireless power and the response power is greater than a preset reference value (x; for example, 1.4 W) (YES in 1116), During the standby time, the second wireless power transmission process (1114) and the response power reception process (1115) are repeated (No in 1117). However, when the standby time has elapsed in a state in which the response power is determined to be continuously weak (“Yes” in 1117), the control unit 54 stops charging as in the case of not receiving the response power (“No” in 1115). Do (1118).

Meanwhile, when the difference between the second wireless power and the response power is equal to or less than the preset reference value (x) (“No” in 1116), the control unit 54 determines that the response power is strong, and determines that the second wireless power and the response power are strong. The second wireless power transmission process (1114) and the response power reception process (1115) are repeated until the difference exceeds the preset reference value (x) (that is, until the magnitude of the response power becomes weak) (step 1117). "no"). The terminal ob1 may be charged by the second wireless power transmission process 1114 and the response power reception process 1115 .

Hereinafter, with reference to FIGS. 7 to 9 , a method 1113 in which the control unit 54 of the vehicle charging device 50 analyzes a frequency spectrum of a sound wave according to an embodiment will be described in detail.

7 is a conceptual diagram illustrating a first wireless power and sound wave transmission and reception process between a charging device and a terminal according to an embodiment, and FIG. 8 is a first wireless power and sound wave transmission and reception process between a charging device and a foreign object according to an embodiment. It is a conceptual diagram for explanation, and FIG. 9 is various exemplary diagrams of a frequency spectrum of a sound wave received by a terminal.

When the coil 52 of the vehicle wireless device 50 transmits the first wireless power having a short pulse (eg, a pulse of 65 ms) to the surroundings, objects around the coil 52 respond to the first wireless power to transmit sound waves with a wide spectrum of frequencies.

Referring to FIG. 7 , when a terminal ob1 capable of charging exists around the wireless device 50 for a vehicle 50, a sound wave detected by the sound wave receiver 51 of the wireless device 50 for a vehicle 50 is transmitted in a specific frequency band f1. It may have a size greater than or equal to the reference value ref, and may have a size less than the reference value ref in other frequency bands.

Alternatively, although not shown, when a terminal ob1 capable of charging exists around the wireless device 50 for a vehicle 50, the sound wave detected by the sound wave receiver 51 of the wireless device 50 for a vehicle 50 is a reference value (ref) in the entire frequency band. ) may have a size less than

However, referring to FIG. 8 , when a non-rechargeable foreign material ob2 (eg, a metal material) exists around the vehicle wireless device 50, it is received by the sound wave receiver 51 of the vehicle wireless device 50. The generated sound wave has a magnitude greater than the reference value ref in a wide frequency band f2.

The control unit 54 of the wireless device 50 for a vehicle according to an embodiment may distinguish the terminal ob1 and the foreign material ob2 by analyzing the characteristics of the frequency spectrum of sound waves of the terminal ob1 and the foreign material ob2. .

As an example, referring to (a) of FIG. 9 , the control unit 54 determines that the size of a sound wave is greater than or equal to the reference value ref in the preset first frequency band f1 and less than the reference value ref in other frequency bands. In this case, it may be determined that the object around the vehicle wireless device 50 is the terminal ob1. Information on the preset first frequency band f1 may be previously stored in the storage unit 55 as a database.

In addition, the control unit 54 determines that the size of the sound wave is equal to or greater than the reference value ref in the preset first frequency band f1, and the preset second frequency band f2 (eg, an audible frequency band of 20 Hz or more and less than 10 kHz) When is less than the reference value ref, it may be determined that the object around the wireless device 50 for a vehicle is the terminal ob1. Information on the preset first frequency band f1 and second frequency band f2 may be previously stored in the storage unit 55 as a database.

Here, the first frequency band f1 may be set differently according to the type of terminal ob1 as shown in (a) and (b) of FIG. 9 . The storage unit 55 may store the first frequency band f1 respectively corresponding to the type of terminal ob1 as a database.

In addition, referring to (c) of FIG. 9 , the control unit 54 detects sound waves, but when the entire frequency band (that is, all frequency bands that can be received by the sound wave receiving unit 51) is less than the reference value ref, the vehicle wireless It may be determined that the object around the device 50 is the terminal ob1.

Also, although not shown, when sound waves are not detected in the entire frequency band, it is also possible to determine that an object around the vehicle wireless device 50 is a non-metallic foreign substance.

On the other hand, the control unit 54, when the magnitude of the sound wave is greater than or equal to the reference value ref in the preset second frequency band f2 (eg, an audible frequency band of 20 Hz or more and less than 10 kHz), the object around the vehicle wireless device 50 It can be determined that is foreign matter (ob2).

In addition, the control unit 54 may determine that the object around the vehicle wireless device 50 is a foreign object ob2 when the size of the sound wave is greater than or equal to the reference value ref in a frequency band other than the first frequency band f1. .

In addition, the controller 54 may determine that an object around the wireless device 50 for a vehicle is a foreign object ob2 when the size of the sound wave is greater than or equal to the reference value ref in the entire frequency band.

In this way, the vehicle charging device 50 included in the vehicle 100 transmits the first wireless power to receive sound waves of objects existing in the vicinity, and analyzes the frequency spectrum of the sound waves to determine whether the terminal ob1 and the foreign matter ob2 ), it is possible to transmit wireless power by distinguishing between, it is possible to reduce power waste due to wireless power transmission to foreign substances.

The above description is for illustrative purposes, and those skilled in the art will understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted as being included in the scope of the present invention. do.

100: vehicle 50: charging device
51: sound wave receiver 52: coil
53: wireless power transmission unit 53a: first transmission unit
53b: second transmission unit 54: control unit
55: storage unit

Claims (20)

a coil transmitting first wireless power;
a sound wave receiving unit receiving sound waves generated by the first wireless power; and
Including a control unit that analyzes the frequency spectrum of the sound wave and distinguishes a rechargeable terminal from a foreign substance,
The control unit determines that the terminal is chargeable when the magnitude of the sound wave is greater than or equal to a preset reference value in a first preset frequency band and less than the reference value in a frequency band other than the first frequency band;
A vehicle charging device for controlling the coil to transmit second wireless power for wireless charging of the terminal when it is determined that the terminal is capable of being charged. According to claim 1,
The coil transmits one or more short pulses as first wireless power. According to claim 1,
The coils are plural, and each coil sequentially transmits short pulses with a mutual time difference. delete According to claim 1,
The control unit determines that the terminal is capable of charging when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset first frequency band and less than a preset value in a preset second frequency band. According to claim 5,
The second frequency band is an audible frequency band of 20 Hz or more and less than 10 kHz. According to claim 1,
Wherein the control unit determines that the terminal is capable of charging when the magnitude of the sound wave in all frequency bands receivable by the sound wave receiver is less than a preset reference value. According to claim 1,
The control unit determines that the foreign matter is the vehicle charging device when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset frequency band. According to claim 8,
The preset frequency band is an audible frequency band of 20 Hz or more and less than 10 kHz. According to claim 1,
The control unit determines that the sound wave is a foreign substance when the sound wave is greater than a preset reference value in all frequency bands receivable by the sound wave receiver. According to claim 1,
The control unit repeatedly transmits second wireless power when the coil receives response power from the terminal, but stops transmission of the second wireless power when the coil does not receive response power from the terminal. . delete delete Transmitting first wireless power;
receiving a sound wave generated by the first wireless power;
Analyzing the frequency spectrum of the sound wave to classify a rechargeable terminal and a foreign substance; and
Transmitting second wireless power for wireless charging of the terminal when it is determined that the terminal is capable of charging,
In the step of classifying, when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset first frequency band and less than the reference value in a frequency band other than the first frequency band, determining the terminal as a chargeable terminal. control method. 15. The method of claim 14,
The transmitting of the first wireless power includes transmitting one or more short pulses as the first wireless power. According to claim 15,
The transmitting of the first wireless power includes sequentially transmitting a plurality of short pulses with a mutual time difference. delete 15. The method of claim 14,
In the step of classifying, when the magnitude of the sound wave is greater than or equal to a preset reference value in a first preset frequency band and less than a reference value in a preset second frequency band, determining the terminal as a chargeable terminal. Method for controlling a vehicle. 15. The method of claim 14,
In the distinguishing step, when the magnitude of the sound wave is greater than or equal to a preset reference value in a preset frequency band, it is determined as the foreign substance. According to claim 19,
The preset frequency band is an audible frequency band of 20 Hz or more and less than 10 kHz.

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