KR102543532B1 - Interface for wireless power transmission device - Google Patents

Abstract

The power transmission device of the present invention includes a power transmission module installed outside a vehicle and performing data communication with a power reception module installed in the vehicle in order to charge the vehicle, the power transmission module comprising: power, communication Transmits communication state set-up, charger number, and information indicating a normal state and a standby state of the power transmission module to the power reception module, and a user interface installed in the vehicle The power is transmitted to the power reception module according to the charging time set by the module, and in response to a charging start request generated through a user interface displayed on a display unit installed in the vehicle, before the set charging time. The power is transmitted to the power reception module, and charging progress state information and state information of the power transmission module are transmitted to the power reception module so that a display device installed in the vehicle displays a charging progress state and a state of the power transmission module.

Description

Interface of wireless power transmission device {INTERFACE FOR WIRELESS POWER TRANSMISSION DEVICE}

The present invention relates to a user interface of a power transmission device for a vehicle, and more particularly, provides an interface between a power receiving module for wireless power transmission and a user, and data communication between the power receiving module and the interface follows the communication protocol of the present invention. By doing so, it relates to an interface of a wireless power transmission device that allows a user to easily charge a high-voltage battery vehicle and a charging method using the same.

Currently, automobile manufacturers in each country are developing vehicles using high-voltage batteries, and accordingly, various technologies for charging vehicles using the high-voltage batteries are being researched. In particular, a technology for wirelessly charging a vehicle using a high-voltage battery has been studied internationally and has reached a stage where a technical standard is established. A technology for wirelessly charging a vehicle using a high-voltage battery currently discussed internationally is being researched as follows.

1 is a conceptual diagram showing a wireless power transmission device according to the prior art, FIG. 2 is a block diagram showing a wireless power transmission device according to the prior art, and FIG. 3 is a data transmission/reception between a transmission module, a power reception module and a BMS according to the prior art It is a block diagram showing

1 to 3, the wireless power transmission device 1 for a vehicle includes a power transmission module 10 that receives AC 220V voltage on the ground and switches a transmission coil, and transmits energy of the power transmission module to a power reception module through resonance. / It consists of a receiving pickup coil 20, a power receiving module 30 that switches the received energy according to the high voltage battery of the vehicle, and a battery management system (BMS: Battery Management System) 40.

The power transmission module 10 installed on the floor of a road or parking lot and the power reception module 30 installed under the vehicle perform wireless data communication according to a communication protocol, thereby performing wireless charging start and wireless charging completion operations.

More specifically, in the wireless data communication between the power transmission module 10 and the power reception module 30, the information provided by the power transmission module 10 to the power reception module 30 uses the communication protocols of Tables 1 to 4 below. follow

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX1 CF_COMMUCATION_SET

100ms
0
0 One

power transmission module

faucet module Communication status setup
(Start of communication) CF_POLLING STATE One One Message for periodic monitoring of power receiving module status CR_ID_CHK 2 16 ABCDE ID confirmation message CR_CHARGER_NUM_CHK 4 32 1234 Charger number confirmation message CR_CUR_FAULT_CHK 6 48 1011 Current Fault Information Confirmation Message CAR_NUM 1s 7 56 0 to 255 vehicle identification number

Here, XX1 is information transmitted by the power transmission module, and is data related to a communication state between the power transmission module and the power reception module, a confirmation message of the power reception module, vehicle information, and the like.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX2 CF_CONTROL_START

100ms 0 0 One

power transmission module

faucet module start wireless charging CR_TX_STATE One 8 0 to 4 0 : Normal, 1 : Abnormal,
2: standby, 3: power transmission
4: Transmission module status value transmission CR_RX_STATE 2 16 0 to 4 0 : Normal, 1 : Abnormal,
2: standby, 3: power transmission
4: Request for power transmission module status value CR_TX_FAULT 4 32 1111 Power Transmission Module Colt Status Message CR_RX_FAULT 6 48 1011 Power Transmission Module Colt Status Message

Here, XX2 is information transmitted by the power transmission module, and is data related to charging progress status information.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX3 BMS_INFO_REQ

100ms 0 0 One

power transmission module

faucet module BMS Information Request BMS_INFO_RESP_ACK One
8 One BMS information normal response message BMS_INFOR_RESP_NAK 9 One BMS Information Abnormal Negative Message RX_CHAR_INFO_REQ 2 16 One Receiving module information request RX_CHAR_INFO_RESP_ACK 3
24 One Power reception module information Normal response message RX_CAR_INFO_RESP_NAK 25 One Power reception module information Abnormal response message

Here, XX3 is information transmitted by the power transmission module, and is data related to a BMS (Battery Management System) and a request for information related to the power reception module.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT

XX4 CR_TX_AC_VOL

100ms 0 0 0 to 500

power transmission module

faucet module Transmission module input voltage CR_TX_AC_CUR One 8 0 to 50 Transmission module input current CR_TX_PSFB_IN_CUR 2 16 0 to 50 Transmission module full bridge input voltage CR_TX_PSFB_IN_VOL 3 24 0 to 500 Transmission module full bridge input current CR_TX_TEMP 5 40 -40 to 150 Transmission module temperature

Here, XX4 is information transmitted by the power transmission module, which is data related to power transmission module information, etc. In addition, in wireless data communication between the power transmission module 10 and the power reception module 30, the power reception module 30 is the power transmission module ( The information provided in 10) follows the communication protocols in Tables 5 to 8 below.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX1 CF_CONTROLLABLE

100ms
0 0 One

faucet module

power transmission module Wireless charging start possible status information message CF_COMMUNICATION_OK One One communication status normal CF_RESP_ACK 2 One normal response message CF_RESP_NAK 3 One Abnormal response message CR_TX_STATE One 8 0 to 4 0: normal, 1: abnormal
2; standby, 3: transfer power
4: Transmission of power receiving module status value CR_RX_STATE 2 16 0 to 4 0: normal, 1: abnormal
2; standby, 3: transfer power
4: Transmission of power receiving module status value CR_TX_FAULT 4 32 1111 Transmission Module Fault Status Messages CR_RX_FAULT 6 48 1011 Power Supply Module Fault Status Message

Here, XX1 is information transmitted by the power receiving module, and is data related to a communication state between the power transmitting module and the receiving module.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XX2 BMS_CUR_INFOR
100ms 0 8 0 to 20
faucet module
power transmission module BMS control current message BMS_VOL_INFO 2 16 0 to 500 BMS control voltage message BMS_FAULT_STATE 4 32 1011 BMS fault information message BMS_TEMP 6 48 -40 to 150 BMS temperature message

Here, XX2 is information transmitted by the power reception module, and is data related to BMS (Battery Management System) information.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT

XX3 CR_RX_DC_VOL
100ms One 8 0 to 500

faucet module

power transmission module Power receiving module output voltage message CR_RX_DC_CUR 2 16 0 to 50 Power receiving module output current message CR_RX_TEMP 4 32 -40 to 150 Power supply module temperature message

Here, XX3 is information transmitted by the power receiving module, and is data related to information related to the power receiving module.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT

XX4 CR_ID_CHK
100ms 2 16 ABCDE

faucet module

power transmission module ID confirmation message CR_CHARGER_NUM_CHK 4 32 1234 Charger number confirmation message CR_CUR_FAULT_CHK 6 48 1011 Current Fault Information Confirmation Message CAR_NUM 1s 7 56 0 to 255 vehicle identification number

Here, XX4 is information transmitted by the power receiving module, which is data related to vehicle information and ID verification. It exchanges related information such as voltage, current, command value, etc., and ensures that charging operation is performed stably.

More specifically, in wireless data communication between the power receiving module 30 and the battery management system (BMS) 40, the information mutually provided by the power receiving module 30 and the battery management system (BMS) 40 is as follows According to the communication protocols of Tables 9 to 10 of

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT







XX5 CF_OBC_Rdy


100ms


0 0 One








faucet module








BMS Ready (charger internal CAN communication, control board preparation command) CF_OBC_Wrn One One Setting when a failure situation other than OBC failure occurs CF_OBC_Flt 2 One Fault (setting when OBC failure occurs) CF_OBC_CharMode 3 3 Charge All (CC/CV/CP) 4 CF_OBC_Connection 5 One Charging connector connection status CF_OBC_ChgFinished 6 One End of charge
(Value : 1 end) CF_OBC_PowerEnaStat 7 One Ready to charge notification CR_OBC_FltCode One 8 0 to 255 charger error code
(diagnostic communication code) CR_OBC_Temp 2 16 40~120℃ charger internal temperature CR_OBC_Effi 3 24 0-110% charger efficiency CR_OBC_MaxPwr_W 4 32 50W standard maximum charge possible
power value CR_OBC_MaxCur_A 5 40 0~150A maximum chargeable
current value CR_OBC_MaxVolt_V 6 48 0~1100V maximum charge possible
voltage value 7 56

Here, XX5 is information transmitted by the power receiving module, and is data related to internal state information of the power receiving module and charging related state information.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT



XX1 CF_BMS_RdyForOBC




100ms


0 0 One



BMS



faucet module Ready (in-vehicle CAN communication, ready command) CF_BMS_WrnForOBC One One Warning (set in case of failure other than BMS failure) CF_BMS_FaultForOBC 2 One Fault (set in case of failure to charge) CF_BMS_MainRlyOnStatForOBC 3 One High voltage relay on/off status when charging CF_BMS_PwrLmtForOBC 4 3 layer power limit
5 CF_BMS_AbnorChg 6 One Charging status (0: Normal,
1: Abnormal) CF_BMS_OBCChgFinishedForOBC 7 One full charge status CR_BMS_SoForOBC_Pc One 8 5-90% Battery SOC(%) CR_BMS_CharRemainedTime_min 2 16 0 to 600
min
Remaining charge time
(Remaining time for full charge) 3 24 CR_BMS_OBCcmdCur_A 4 32 0~150A
CC mode constant current value 5 40 CR_BMS_OBCCmdVolt_V 6 48 0~1100V
CV mode constant voltage value 7 56

Here, XX1 is information transmitted by the battery management system (BMS), and is data related to internal state information and charging-related state information of the battery management system (BMS). However, the current technology for wirelessly charging a vehicle using a high-voltage battery is a communication protocol between the wireless power transmission device 1, a transmission module and a power reception module (2), and a communication protocol between the power reception module and a battery management system (BMS). Only (3) is defined. That is, there is a problem in that there is no description of an interface connecting the wireless power transmitter 1 and the user and a communication protocol defining wireless data communication between the wireless power transmitter 1 and the interface.

KR 2014-0061337 A

The present invention has been proposed to solve the above problems, by combining a user interface with a wireless power transmission device, defining a communication protocol for operating it, and presenting a charging method by the interface of the wireless power transmission device, An object of the present invention is to provide an interface for a wireless power transmission device that easily charges a high-voltage battery vehicle.

In addition, the present invention is a wireless power transmission device that efficiently charges a high-power battery vehicle by combining a user interface with a wireless power transmission device, defining a communication protocol for operating the wireless power transmission device, and presenting a charging method using the interface of the wireless power transmission device. Another purpose is to provide an interface for

In order to achieve the above object, a first embodiment of an interface of a wireless power transmission device according to the present invention includes a power transmission module that transmits power and is installed outside a vehicle; a power reception module installed in the vehicle and receiving power from the power transmission module; and a user interface module for controlling the location of the vehicle, the power transmission module, and the power reception module to transmit power from the power transmission module to the power reception module. It may be characterized by including.

In this case, the information transmitted from the power receiving module to the user interface module may be state information of the power receiving module and charging related state information.

In particular, information transmitted from the power reception module to the user interface module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XX7 CF_RXWPT_RdyForOBC
100ms 0 0 One repair module user interface module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_BMS_SoForOBC_Pc One 8 5-90% charge level display

In addition, the information transmitted from the user interface module to the power reception module may include state information of the user interface module, charging-related commands, operation-related information of a matching auxiliary module, and charging-related setting information. Information transmitted from the interface module to the power receiving module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give
data state value
(example)

FROM
TO
detail BYTE BIT


XX8 CF_Navi_Rdy

100ms

0 0 One

user interface module

faucet module





Navigator Ready status CF_Navi_ChgStart One One charging start button CF_Navi_ChgFinished 2 One Charge complete button CF_Navi_PAS_LocMatch_Start 3 One Start PAS Position Calibration CF_Navi_PAS_LocMatch_End 4 One PAS position correction complete CR_WPT_Chr_Time
One 8 0~600min
Charging time setting
2 16 CR_WPT_Chr_Power
3 24 0~10kW
Charging power setting 4 32

At this time, the information transmitted from the power transmission module to the power receiving module includes communication status information of the power transmission module, vehicle information related command of the power transmission module, charging related status information, charging related command, BMS information related command, power receiving module information related command, power transmission It may be characterized as module information. In addition, the information transmitted from the power reception module to the power transmission module includes communication status information of the power reception module, vehicle information-related response of the power reception module, charging-related status information, BMS control-related information, power-reception module output-related information, and vehicle and ID-related information. In addition, the user interface module displays the location of a transmission coil connected to the power transmission module to transmit power and the location of a reception coil connected to the power reception module to receive power, and the vehicle It may be characterized in that by guiding the movement route, the user drives the vehicle to match the transmission coil and the reception coil.

In addition, the user interface module may be characterized in providing an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer.

In addition, the user interface module may be a vehicle navigation device.

A second embodiment of the interface of the wireless power transmission device according to the present invention includes a power transmission module that transmits power and is installed outside the vehicle; a power reception module installed in the vehicle and receiving power from the power transmission module; a user interface module for controlling the location of the vehicle, the power transmission module, and the power reception module to transmit power from the power transmission module to the power reception module; and matching the transmitting coil with the receiving coil by moving the vehicle using location information of a transmitting coil connected to the power transmission module to transmit power and location information of a receiving coil connected to the power receiving module to receive power. Matching auxiliary module to make; It may be characterized by including.

In this case, the information transmitted from the power receiving module to the user interface module may be state information of the power receiving module and charging related state information.

In particular, information transmitted from the power reception module to the user interface module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XX7 CF_RXWPT_RdyForOBC
100ms 0 0 One repair module user interface module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_BMS_SoForOBC_Pc One 8 5-90% charge level display

In addition, the information transmitted from the user interface module to the power reception module may include state information of the user interface module, charging-related commands, operation-related information of a matching auxiliary module, and charging-related setting information. Information transmitted from the interface module to the power receiving module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give
data state value
(example)

FROM
TO
detail BYTE BIT


XX8 CF_Navi_Rdy

100ms

0 0 One

user interface module

faucet module





Navigator Ready status CF_Navi_ChgStart One One charging start button CF_Navi_ChgFinished 2 One Charge complete button CF_Navi_PAS_LocMatch_Start 3 One Start PAS Position Calibration CF_Navi_PAS_LocMatch_End 4 One PAS position correction complete CR_WPT_Chr_Time
One 8 0~600min
Charging time setting
2 16 CR_WPT_Chr_Power
3 24 0~10kW
Charging power setting 4 32

In addition, the information transmitted from the power reception module to the matching assistance module may include status information of the power reception module, charging progress status information, vehicle location information, and vehicle movement-related check information. Information transmitted to the matching assistant module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX9 CF_RXWPT_RdyForOBC

100ms

0 0 One

faucet module

Matching auxiliary module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_RXWPT_Matching_1 One 8 0-50cm Vehicle position coordinate correction
(front) CR_RXWPT_Matching_2 2 16 0-50cm Vehicle position coordinate correction
(back) CR_RXWPT_Matching_3 3 24 0-50cm Vehicle position coordinate correction
(left) CR_RXWPT_Matching_4 4 32 0-50cm Vehicle position coordinate correction
(right) CR_Matching_info 5 40 3 Move vehicle ok/nok/remove

In addition, the information transmitted from the matching assistance module to the power receiving module may include state information of the matching assistance module, charging progress status information, vehicle location related commands and information, and vehicle movement progress related information. Data transmitted from the matching auxiliary module to the power reception module may be characterized in that it conforms to a communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XXA CF_PAS_Rdy

100ms

0 0 One

Matching auxiliary module

faucet module PAS Ready status information CF_PAS_ChgStart One One Charging start information CF_PAS_ChgFinished 2 One Charge completion information CR_PAS_LOC_Req 3 One Request movement coordinate information CF_PAS_LocMatch_Start 4 One start vehicle movement CF_PAS_LocMatch_End 5 One stop vehicle movement

At this time, the information transmitted from the power transmission module to the power receiving module includes communication status information of the power transmission module, vehicle information related command of the power transmission module, charging related status information, charging related command, BMS information related command, power receiving module information related command, power transmission It may be characterized as module information. In addition, the information transmitted from the power reception module to the power transmission module includes communication status information of the power reception module, vehicle information-related response of the power reception module, charging-related status information, BMS control-related information, power-reception module output-related information, and vehicle and ID-related information. In addition, the user interface module may be characterized by providing an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer.

In addition, the user interface module may be a vehicle navigation device.

In addition, the matching assistance module may automatically move the vehicle so that positions of the transmitting coil and the receiving coil are matched with each other.

In addition, the matching assistance module may be characterized in that a parking assistance system (PAS: Parking Assistant System).

A third embodiment of the interface of the wireless power transmission device according to the present invention includes a power transmission module that transmits power and is installed outside the vehicle; a power reception module installed in the vehicle and receiving power from the power transmission module; a user interface module for controlling the location of the vehicle, the power transmission module, and the power reception module to transmit power from the power transmission module to the power reception module; Matching the transmitting coil and the receiving coil by moving the vehicle using the location information of the transmitting coil connected to the power transmission module to transmit power and the location information of the receiving coil connected to the power receiving module to receive power matching auxiliary module; and a display device displaying a charging progress state by the wireless power transmission device. It may be characterized by including.

In addition, the information transmitted from the power reception module to the user interface module may be state information of the power reception module and charging-related state information.

In particular, information transmitted from the power reception module to the user interface module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XX7 CF_RXWPT_RdyForOBC
100ms 0 0 One repair module user interface module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_BMS_SoForOBC_Pc One 8 5-90% charge level display

In addition, the information transmitted from the user interface module to the power reception module may include state information of the user interface module, charging-related commands, operation-related information of a matching auxiliary module, and charging-related setting information. Information transmitted from the interface module to the power receiving module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give
data state value
(example)

FROM
TO
detail BYTE BIT


XX8 CF_Navi_Rdy

100ms

0 0 One

user interface module

faucet module





Navigator Ready status CF_Navi_ChgStart One One charging start button CF_Navi_ChgFinished 2 One Charge complete button CF_Navi_PAS_LocMatch_Start 3 One Start PAS Position Calibration CF_Navi_PAS_LocMatch_End 4 One PAS position correction complete CR_WPT_Chr_Time
One 8 0~600min
Charging time setting
2 16 CR_WPT_Chr_Power
3 24 0~10kW
Charging power setting 4 32

In addition, the information transmitted from the power reception module to the matching assistance module may include status information of the power reception module, charging progress status information, vehicle location information, and vehicle movement-related check information. Information transmitted to the matching assistant module may be characterized in that it conforms to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX9 CF_RXWPT_RdyForOBC

100ms

0 0 One

faucet module

Matching auxiliary module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_RXWPT_Matching_1 One 8 0-50cm Vehicle position coordinate correction
(front) CR_RXWPT_Matching_2 2 16 0-50cm Vehicle position coordinate correction
(back) CR_RXWPT_Matching_3 3 24 0-50cm Vehicle position coordinate correction
(left) CR_RXWPT_Matching_4 4 32 0-50cm Vehicle position coordinate correction
(right) CR_Matching_info 5 40 3 Move vehicle ok/nok/remove

In addition, the information transmitted from the matching assistance module to the power receiving module may include state information of the matching assistance module, charging progress status information, vehicle location related commands and information, and vehicle movement progress related information. Data transmitted from the matching auxiliary module to the power reception module may be characterized in that it conforms to a communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XXA CF_PAS_Rdy

100ms

0 0 One

Matching auxiliary module

faucet module PAS Ready status information CF_PAS_ChgStart One One Charging start information CF_PAS_ChgFinished 2 One Charge completion information CR_PAS_LOC_Req 3 One Request movement coordinate information CF_PAS_LocMatch_Start 4 One start vehicle movement CF_PAS_LocMatch_End 5 One stop vehicle movement

In addition, the information transmitted from the power receiving module to the display device may be charging progress state information and state information of the power receiving module and the power transmitting module. In particular, the information transmitted from the power receiving module to the display device may be It can be characterized by conforming to the communication protocol according to the following table.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XXB CF_RXWPT_Charging 100ms
0
0 One faucet module display device display while charging CF_RXWPT_Finish One One Charging complete indication

At this time, the information transmitted from the power transmission module to the power receiving module includes communication status information of the power transmission module, vehicle information related command of the power transmission module, charging related status information, charging related command, BMS information related command, power receiving module information related command, power transmission It may be characterized as module information. In addition, the information transmitted from the power reception module to the power transmission module includes communication status information of the power reception module, vehicle information-related response of the power reception module, charging-related status information, BMS control-related information, power-reception module output-related information, and vehicle and ID-related information. In addition, the user interface module may be characterized by providing an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer.

In addition, the user interface module may be a vehicle navigation device.

In this case, the matching assistance module may automatically move the vehicle so that positions of the transmitting coil and the receiving coil are matched with each other.

In addition, the matching assistance module may be characterized in that a parking assistance system (PAS: Parking Assistant System).

In addition, the display device may be characterized in that it is a cluster.

One embodiment of a method for charging a vehicle through an interface of a wireless power transmission device according to the present invention includes a charging request input step in which a user interface module receives a charging request for a vehicle; a coil matching step of matching the transmission coil with the reception coil by moving the vehicle using a location of a transmission coil installed outside the vehicle and a location of a reception coil installed in the vehicle; a charging start step in which the user interface module receives a charging start request for the vehicle; and a charging completion step in which charging of the vehicle is completed. can include

In addition, in the coil matching step, the matching assistant module moves the vehicle using the location information of the transmission coil and the location information of the reception coil, so that the transmission coil and the reception coil are matched or the user interface module The location of the transmission coil and the location of the reception coil may be displayed, and a moving path of the vehicle in which the reception coil is installed may be guided so that the transmission coil and the reception coil match each other.

In the coil matching step, the location of the transmission coil may be automatically input by the matching assistant module or manually input by the user interface module.

In addition, the coil matching step may include a power reception module state confirmation step in which the matching auxiliary module receives state information of the power reception module from the power reception module; a vehicle location check step in which the matching assistance module receives the location of the vehicle from the power receiving module; a vehicle movement step in which the vehicle is moved; a matching position determining step in which the matching assistance module receives the position of the moving vehicle from the power reception module and determines whether the position of the vehicle is a position where the transmitting coil and the receiving coil are matched; and a matching completion step of stopping the movement of the vehicle when the location of the vehicle is a location where the transmission coil and the reception coil are matched. can include

In addition, in the matching position determining step, when the location of the vehicle is not a position where the transmitting coil and the receiving coil are matched, the vehicle moving step may be performed again.

Also, prior to the charging start step, a charging power setting step in which the user interface module receives a charging power or charging time for the vehicle; It may be characterized in that it further includes.

In the charging completion step, the user interface module may receive a request for completing charging of the vehicle.

According to the wireless power transmission device for a vehicle according to the present invention, a user can easily charge a vehicle.

In addition, according to the wireless power transmission device for a vehicle according to the present invention, the vehicle can be efficiently charged by increasing the transmission efficiency of the receiving coil and the transmitting coil.

1 is a conceptual diagram showing a wireless power transmission device according to the prior art;
Figure 2 is a block diagram showing a wireless power transmission device according to the prior art.
3 is a block diagram showing data transmission and reception between a power transmission module, a power reception module, and a BMS according to the prior art;
4 is a block diagram showing a first embodiment of an interface of a wireless power transmission device according to the present invention;
5 is a block diagram showing a second embodiment of an interface of a wireless power transmission device according to the present invention;
6 is a block diagram showing a third embodiment of an interface of a wireless power transmission device according to the present invention;
7 is a block diagram showing data transmission and reception between a power receiving module, a user interface module, a matching auxiliary device, and a display device according to the present invention;
8 is a conceptual diagram showing a vehicle charging method through an interface of a wireless power transmission device according to the present invention;
9 is a block diagram showing an embodiment of a vehicle charging method through an interface of a wireless power transmission device according to the present invention.

It should be noted that technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. In addition, technical terms used in this specification should be interpreted in terms commonly understood by those of ordinary skill in the technical field disclosed in this specification, unless specifically defined otherwise in this specification, and are overly inclusive. or should not be construed in an excessively reduced sense. In addition, the accompanying drawings are only for making it easy to understand the spirit of the technology disclosed in this specification, but the spirit of the technology is not limited by the accompanying drawings, and is included in the spirit and technical scope of the technology disclosed in this specification. It should be understood to include all modifications, equivalents or substitutes.

Hereinafter, a first embodiment of an interface of a wireless power transmission device for a vehicle according to the present invention will be described in more detail with reference to the accompanying drawings.

4 is a block diagram showing a first embodiment of an interface of a wireless power transmission device according to the present invention, and FIG. 7 is a block diagram showing data transmission and reception between a power receiving module, a user interface module, a matching auxiliary device, and a display device according to the present invention. It is also

4 and 7, the first embodiment of the interface of the wireless power transmission device according to the present invention may include a power transmission module 10, a power reception module 30, and a user interface module 110.

The power transmission module 10 transmits power and is installed outside the vehicle.

The power reception module 30 receives power from the power transmission module 10 and is installed in the vehicle.

The user interface module 110 controls the location of the vehicle, the power transmission module, and the power reception module so that power can be transmitted from the power transmission module to the power reception module. That is, the user interface module 110 provides an interface between the power receiving module 30 and the user.

More specifically, the user interface module 110 displays the location of the transmission coil 21 connected to the power transmission module to transmit power and the location of the reception coil 22 connected to the power reception module to receive power. By displaying and guiding the vehicle movement path, the user can drive the vehicle to match the transmission coil and the reception coil. That is, the user interface module 110 can guide the user to move the vehicle and match the receiving coil 22 to the transmitting coil 21 by displaying the moving path of the vehicle. The user interface module 110 may be useful when the matching auxiliary module 120 to be described below is not included, and may be used in parallel with the matching auxiliary module 120. In addition, the user interface module 110 may provide an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer.

Here, the user interface module 110 may be a device capable of data communication with the power receiving module 30, and in particular, may be a navigation device for a vehicle.

In particular, the user interface module 110 can perform data communication so that a user can control the power receiving module 30 to charge a vehicle requiring electric charging or a high voltage battery vehicle. At this time, the user interface module 110 receives, from the power reception module 30, power reception module state information, charging status or charging progress information such as charge amount/charging time/charging power information, and charging related commands/responses. can do. In addition, the user interface module 110 transmits commands or responses such as status information of the user interface module, charging start/completion commands, charging time setting/charging amount setting/charging power setting to the power receiving module 30. can

More specifically, the user interface module 110 may perform data communication with the power receiving module 30 according to the communication protocols shown in Tables 22 and 23.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XX7 CF_RXWPT_RdyForOBC
100ms 0 0 One repair module user interface module Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_BMS_SoForOBC_Pc One 8 5-90% charge level display

Here, XX7 is information transmitted from the power reception module 30 to the user interface module 110, and is data related to state information of the power reception module and charging-related state information.

ID
data
to give
data state value
(example)

FROM
TO
detail BYTE BIT


XX8 CF_Navi_Rdy

100ms

0 0 One

user interface module

faucet module





Navigator Ready status CF_Navi_ChgStart One One charging start button CF_Navi_ChgFinished 2 One Charge complete button CF_Navi_PAS_LocMatch_Start 3 One Start PAS Position Calibration CF_Navi_PAS_LocMatch_End 4 One PAS position correction complete CR_WPT_Chr_Time
One 8 0~600min
Charging time setting
2 16 CR_WPT_Chr_Power
3 24 0~10kW
Charging power setting 4 32

Here, XX8 is information transmitted from the user interface module 110 to the power receiving module 30, charging progress status information of the user interface module, charging related commands, operation progress status information of the matching auxiliary module, charging time and power setting information data about, etc. When the interface of the wireless power transmission device according to the present invention includes only the user interface module 110, data related to a parking assistance system (PAS: Parking Assistant System) corresponding to the matching assistance module 120 in the XX8 is not used. or may be deleted. On the other hand, if the wireless power transmission interface according to the present invention includes another interface or the user interface module 110 performs more functions, data according to need may be added to XX7 and XX8. Data provided from the transmission module 10 to the power reception module 30 among the communication protocols according to Table 1 to Table 4 are identical to the conventional communication protocols. In addition, among the communication protocols according to the present invention, the data provided from the power reception module 30 to the transmission module follows Tables 5 to 8 as in the conventional communication protocol. In addition, among the communication protocols according to the present invention, the data mutually provided by the power receiving module 30 and the battery management system (BMS) 40 follow Tables 9 to 10 in the same way as the conventional communication protocol in terms of content. However, in order to easily classify a counterpart module that communicates data with the power receiving module 30, XX5 and XX1, which are data IDs mutually provided by the power receiving module 30 and the battery management system (BMS) 40, are respectively Change to XX5 and XX6. Here, the information transmitted from the power transmission module 10 to the power reception module 30 includes communication status information of the power transmission module, vehicle information related commands of the power transmission module, charging related status information, charging related commands, BMS information related commands, It may be a command related to power reception module information or information of a power transmission module. In addition, the information transmitted from the power reception module 30 to the power transmission module 10 includes communication status information of the power reception module, vehicle information-related response of the power reception module, charging-related status information, BMS control-related information, and power-receiving module output-related information. , vehicle and ID related information.

Hereinafter, a second embodiment of the interface of the wireless power transmission device for a vehicle according to the present invention will be described in more detail with reference to the accompanying drawings.

5 is a block diagram showing a second embodiment of an interface of a wireless power transmission device according to the present invention, and FIG. 7 is a block diagram showing data transmission and reception between a power receiving module, a user interface module, a matching auxiliary device and a display device according to the present invention. It is also

5 and 7, the second embodiment of the interface of the wireless power transmission device according to the present invention may include a power receiving module 30, a user interface module 110, and a matching auxiliary module 120. In particular, in the second embodiment of the interface of the wireless power transmission device according to the present invention, the power receiving module 30 and the user interface module 110 of the first embodiment are the same, but the matching auxiliary module 120 is different. That is, in this embodiment, the matching auxiliary module 120 is further included as an interface between the power reception module 30 and the user. Among the configurations of this embodiment, reference numerals in FIG. 4 are used for the same configurations as those of the first embodiment according to the present invention described above, and detailed descriptions thereof are omitted.

The matching auxiliary module 120 includes location information of the transmitting coil 21 connected to the power transmission module 10 to transmit power and information about the location of the receiving coil 22 connected to the power receiving module 30 to receive power. By moving the vehicle 60 using location information, the transmission coil 21 and the reception coil 22 can be matched. That is, the matching auxiliary module 120 moves the receiving coil 22 to the outside of the vehicle by moving the vehicle 60 in which the receiving coil 22 is installed in order to charge the high voltage battery of the vehicle 60. It is to match the transmission coil 21 installed in the. At this time, in order to efficiently charge the vehicle 60 equipped with the high voltage battery or the like, the transmission coil 21 and the reception coil 22 must be accurately matched. Because, as shown in FIG. 1, the transmitting coil 21 occupies a certain area on the ground, and the vehicle 60 is properly moved so that the receiving coil 22 installed in the vehicle exactly matches the transmitting coil 21 on the ground. This is because the power transmission efficiency of the wireless power transmission device 1 increases as the matching increases.

Also, the matching auxiliary module 120 may automatically move the vehicle 60 so that the positions of the transmitting coil 21 and the receiving coil 22 are matched with each other. Here, the matching assistance module 120 may be a device that can control the movement of the vehicle and perform data communication with the power receiving module 30, in particular, a parking assistance system (PAS: Parking Assistant System). can

In particular, the matching assistance module 120 may receive power reception module state information, charging state information, vehicle location information, or a command/response such as vehicle movement coordinate information from the power reception module 30 . In addition, the matching auxiliary module 120 transmits commands/responses, such as matching auxiliary module state information, charging related state information, vehicle location related state information, and vehicle movement progress state information, to the power receiving module 30. can

More specifically, the matching auxiliary module 120 may perform data communication with the power receiving module 30 according to the communication protocols according to Tables 24 to 25.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XX9 CF_RXWPT_RdyForOBC

100ms

0 0 One

faucet module

PAS Power receiving module Ready status
(Charger internal CAN communication, control board preparation) CF_RXWPT_Charging One One display while charging CF_RXWPT_Finish 2 One Charging complete indication CR_RXWPT_Matching_1 One 8 0-50cm Vehicle position coordinate correction
(front) CR_RXWPT_Matching_2 2 16 0-50cm Vehicle position coordinate correction
(back) CR_RXWPT_Matching_3 3 24 0-50cm Vehicle position coordinate correction
(left) CR_RXWPT_Matching_4 4 32 0-50cm Vehicle position coordinate correction
(right) CR_Matching_info 5 40 3 Move vehicle ok/nok/remove

Here, XX9 is information transmitted by the power receiving module 30, and is data related to state information of the power receiving module, charging progress state information, vehicle location movement coordinate information, vehicle movement check information, and the like.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT


XXA CF_PAS_Rdy

100ms

0 0 One

PAS

faucet module PAS Ready status information CF_PAS_ChgStart One One Charging start information CF_PAS_ChgFinished 2 One Charge completion information CR_PAS_LOC_Req 3 One Request movement coordinate information CF_PAS_LocMatch_Start 4 One start vehicle movement CF_PAS_LocMatch_End 5 One stop vehicle movement

Here, XXA is information transmitted by the matching assistance module 120, and is data related to status information of the matching assistance module, charging progress status information, vehicle movement coordinate information request, vehicle movement progress status information, and the like. In addition, when the wireless power transmission interface according to the present invention includes another interface or the matching assistant module 120 performs more functions, data may be added to XX9 and XXA as needed. Since the power receiving module 30 and the user interface module 110 are substantially the same as those of the first embodiment of the interface of the wireless power transmission device for a vehicle according to the present invention described above, detailed descriptions thereof will be omitted.

Hereinafter, a third embodiment of the interface of the wireless power transmission device for a vehicle according to the present invention will be described in more detail with reference to the accompanying drawings.

6 is a block diagram showing a third embodiment of an interface of a wireless power transmission device according to the present invention, and FIG. 7 is a block diagram showing data transmission and reception between a power receiving module, a user interface module, a matching auxiliary device, and a display device according to the present invention. It is also

6 and 7, the third embodiment of the interface of the wireless power transmission device according to the present invention includes a power receiving module 30, a user interface module 110, a matching auxiliary module 120 and a display device 130 can include In particular, in the third embodiment of the interface of the wireless power transmission device according to the present invention, the power receiving module 30, the user interface module 110, and the matching auxiliary module 120 of the second embodiment are the same, but the display device ( 130) is different. Among the configurations of this embodiment, reference numerals in FIG. 5 are used for configurations identical to those of the second embodiment according to the present invention described above, and detailed descriptions thereof are omitted.

The display device 130 may display a charging progress state by the wireless power transmission device. Here, the display device 130 may be a device capable of displaying charging in progress or charging completion, and in particular, may be a cluster.

In particular, the display device 130, when charging is started by the user interface module 110, can display the amount of charging by the wireless power transmission device, the charging progress state, whether charging is complete, and the like. At this time, the display device 130 may receive charging status or charging progress status information from the power receiving module 30, and a part of the function of the user interface module 110, for example, charging start/charging. Commands/responses such as time setting/charging amount setting/charging power setting/charging can be transmitted.

More specifically, the display device 130 may perform data communication with the power receiving module 30 according to the communication protocol according to Table 26.

ID
data
to give data state value
(example)
FROM
TO
detail BYTE BIT
XXB CF_RXWPT_Charging 100ms
0
0 One faucet module CLUSTER display while charging CF_RXWPT_Finish One One Charging complete indication

Here, XXA is information transmitted by the power receiving module, and is data related to charging progress status information. In addition, when the wireless power transmission interface according to the present invention includes another interface or the display device 130 performs more functions, data according to need may be added to the XXB. ), the user interface module 110 and the matching assistant module 120 are substantially the same as the second embodiment of the interface of the wireless power transmission device for a vehicle according to the present invention described above, and thus detailed descriptions are omitted.

Hereinafter, a vehicle charging method through an interface of a wireless power transmission device according to the present invention will be described in more detail with reference to the accompanying drawings.

8 is a conceptual diagram showing a vehicle charging method through an interface of a wireless power transmission device according to the present invention, and FIG. 9 is a block diagram showing an embodiment of a vehicle charging method through an interface of a wireless power transmission device according to the present invention. It is also

8 and 9, an embodiment of a method for charging a vehicle through an interface of a wireless power transmission device according to the present invention includes a charging request input step (S100), a coil matching step (S200), and a charging power setting step. (S300), a charging start step (S400) and a charge completion step (S500) may be included.

In the charging request input step (S100), the user interface module 110 receives a charging request for the vehicle. That is, in the charging request input step (S100), the user can input a charging request for the vehicle through the user interface module 110. When the interface module 110 receives a user's charging request, a process for charging a vehicle including a high voltage battery described below may be performed. In the charging request input step (S100), data communication may be performed according to the communication protocols XX7 and XX8 of Tables 22 and 23 above.

In the coil matching step (S200), the vehicle 60 is moved using the location information of the transmission coil 21 installed outside the vehicle and the location information of the reception coil 22 installed in the vehicle, so that the transmission coil (21) and the receiving coil (22) are matched. More specifically, in the coil matching step (S200), the matching assistance module 120 uses the location of the transmission coil 21 installed on the ground and the location of the reception coil 22 installed in the vehicle to determine the location of the vehicle 60. ), the transmission coil 21 and the reception coil 22 can be matched. In addition, in the coil matching step (S200), the user interface module 110 displays the location of the transmission coil 21 and the location of the reception coil 22 and guides the vehicle movement path, so that the user can view the vehicle may be operated so that the transmission coil 21 and the reception coil 22 are matched. Here, the location of the transmitting coil 21 may be automatically input by the matching assistant module 120 or manually input by the user interface module 110 . Here, in the coil matching step (S200), data communication may be performed according to the communication protocols XX7, XX8, XX9, and XXA of Tables 22 to 25.

More specifically, the coil matching step (S200) includes the power reception module state checking step (S210), vehicle location checking step (S220), vehicle moving step (S230), matching location determination step (S240), and matching completion step ( S250) may be included. Here, in the power receiving module state checking step (S210), vehicle location checking step (S220), vehicle moving step (S230), matching location determining step (S240), and matching completion step (S250), Tables 22 to 25 Data communication can be performed according to communication protocols XX7, XX8, XX9 and XXA.

In the power receiving module state checking step (S210), the matching assistant module 120 receives the state information of the power receiving module from the power receiving module 30. That is, in the power receiving module state checking step (S210), it is possible to check the charging ready state of the power receiving module 30.

In the vehicle location checking step (S220), the matching assistance module 120 receives the location of the vehicle from the power receiving module 30. More specifically, in the vehicle position checking step (S220), the matching assistance module 120 receives the position coordinates of the front, rear, left, and right of the vehicle from the power receiving module 30 to determine the current vehicle 60 The position of and the position of the receiving coil 22 installed in the vehicle 60 can be specified.

In the vehicle moving step (S230), the vehicle is moved. More specifically, in the vehicle moving step (S230), the matching assistance module 120 may move the vehicle by using the location information of the transmission coil 21 and the location information of the reception coil 22. there is. In addition, in the vehicle moving step (S230), the user interface module 110 displays the location of the transmission coil 21 and the location of the reception coil 22 and guides the vehicle movement path, so that the user can You must be able to move the vehicle. Here, the location of the transmitting coil 21 may be automatically input by the matching assistant module 120 or manually input by the user interface module 110 .

In the matching position determining step (S240), the matching assistance module 120 receives the position of the moving vehicle from the power receiving module 30, and the position of the vehicle 60 is determined by the transmission coil 10 and the position of the vehicle 60. It is determined whether the receiving coil 30 is matched. More specifically, in the matching position determining step (S240), the matching assistance module 120 compares the position of the transmitting coil 10 installed outside the vehicle and the position of the receiving coil 30 installed in the moving vehicle. Thus, it is possible to determine whether or not the transmission coil 10 and the reception coil 30 match and the degree of matching. In addition, in the matching position determination step (S240), the position of the transmitting coil 10 and the position of the receiving coil 30 installed in the vehicle moving according to the vehicle movement path guidance of the user interface module 110 are compared to It is also possible to determine whether or not the transmission coil 10 and the reception coil 30 match and the degree of matching. In the matching position determination step (S240), the matching position determination may be determined based on whether the transmission coil 10 and the reception coil 30 match and the degree of matching. In particular, the transmission coil 10 and the reception coil 30 A condition in which the receiving coil 30 is matched by 90% or more may be used as a criterion.

In the matching completion step (S250), when the location of the vehicle 60 is a location where the transmission coil 21 and the reception coil 22 are matched, the movement of the vehicle is stopped. That is, in the matching completion step (S250), after the transmission coil 21 and the reception coil 22 are matched, the vehicle 60 can be stopped to charge.

In the charging power setting step (S300), the user interface module 110 receives charging power or charging time for the vehicle. That is, in the charging power setting step (S300), the user can input the charging amount for charging the vehicle, that is, charging power and charging time through the user interface module 110. The charging power setting step (S300) may not be performed as needed, but the charging power setting step (S300) is included in the present embodiment. Here, in the charging power setting step (S300), data communication may be performed according to the communication protocols XX7 and XX8 of Tables 22 and 23.

In the charging start step (S400), the user interface module 110 receives a charging start request for the vehicle. That is, in the charging start step (S400), the user can input charging start for the vehicle through the user interface module 110. Here, in the charging start step (S400), data communication may be performed according to the communication protocols XX7, XX8, XX9, and XXA of Tables 22 to 25 above.

In the charging completion step (S500), charging of the vehicle 60 is completed. More specifically, in the charging completion step (S500), charging of the vehicle may be completed when the vehicle 60 is fully charged. In addition, in the charging completion step (S500), the user interface module 110 may receive an input of a charging completion request for the vehicle. That is, in the charging completion step (S500), the user can arbitrarily input charging completion for the vehicle through the user interface module 110. Accordingly, the user can complete charging of the vehicle at any time. Here, in the charging completion step (S500), data communication may be performed according to the communication protocols XX7, XX8, XX9, and XXA of Tables 22 to 25.

In any of the above steps, data communication can be performed according to the communication protocol XXB of Table 26. Also, in any of the above steps, data communication may be performed according to the communication protocols of Tables 1 to 10 and Tables 22 to 26 as needed.

As described above, within the scope of the basic technical idea of the present invention, many other modifications are possible to those skilled in the art, and the scope of the present invention is based on the appended claims. will have to be interpreted

1: Vehicle wireless power transmission device
2: Communication protocol between power transmission module and power receiving module
3: Communication protocol between power receiving module and battery management system (BMS)
10: power transmission module
20: transmit/receive pickup coil
21: transmitting coil 22: receiving coil
30: power supply module
40: battery management system
50: power supply 60: vehicle
100: interface between power receiving module and user
110: user interface module
120: matching auxiliary module
130: display device

Claims (9)

In a power transmission device that is installed in a vehicle and includes a power reception module that performs data communication with a power transmission module installed outside the vehicle in order to charge the vehicle,
The power receiving module,
Receiving power, communication state set-up, and information indicating a normal state and a standby state of the power transmission module from the power transmission module;
Receiving the power from the transmission module according to a charging time set by a user interface module installed in the vehicle;
In response to a charging start request generated through a user interface displayed on a display device installed in the vehicle, the power transmission module receives the power from the power transmission module before the set charging time and displays the state of the power transmission module. Receive status information from the power transmission module;
a user interface module for automatically or manually inputting a position of a transmission coil connected to an external power transmission module and inputting a preset charging time; and
Parking for moving the vehicle based on at least two coordinates input from the power receiving module and transmitting a charging start command to the power receiving module after the location of the power transmission device installed outside the vehicle matches the location of the vehicle Including more auxiliary systems,
The user interface module provides an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer,
The power receiving module transmits information related to CAN communication inside the charger and the ready state of the control board and correction of the front, rear, left and right position coordinates of the vehicle to the parking assistance system. In paragraph 1,
The power receiving module,
A power transmission device that transmits a charger number confirmation message for a charger number to the power transmission module. In paragraph 1,
The power receiving module,
A power transmission device that receives a vehicle identification number from the power transmission module. In paragraph 1,
The power receiving module,
The power transmission device for transmitting information indicating any one of a normal state, an abnormal state, and a standby state of the power reception module to the transmission module. In paragraph 1,
The power receiving module,
A power transmission device that transmits a message indicating a charging start possible state to the power transmission module. In a charging method of a power transmission device including a power receiving module installed in a vehicle,
transmitting, by the power reception module, a command related to starting charging to a power transmission module installed outside the vehicle; and
The power reception module starts receiving power from the power transmission module regardless of a preset charging time according to the transmitted command related to the start of charging;
The power transmission device,
a user interface module for automatically or manually inputting a position of a transmission coil connected to an external power transmission module and inputting a preset charging time; and
Parking for moving the vehicle based on at least two coordinates input from the power receiving module and transmitting a charging start command to the power receiving module after the location of the power transmission device installed outside the vehicle matches the location of the vehicle Including more auxiliary systems,
Before starting to receive power from the power transmission module,
providing, by the user interface module, an initial screen for selecting charging by wireless power transfer and an execution screen for executing wireless power transfer; and
The power receiving module further comprises transmitting information related to CAN communication inside the charger and the ready state of the control board and correction of the front, rear, left and right position coordinates of the vehicle to the parking assistance system. method. In paragraph 6,
The charging method of the power transmission device further comprising the step of transmitting, by the power reception module, information indicating a charging start possible state to the power transmission module. In paragraph 6,
and transmitting, by the power reception module, information indicating any one of a normal state, an abnormal state, and a ready state of the power reception module to the power transmission module. In paragraph 6,
The charging method of the power transmission device further comprising the step of transmitting, by the power reception module, information indicating an output voltage and an output current of the power reception module to the power transmission module.

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