KR102676502B1 - Wireless charging system and method for electric scooter of vehicle - Google Patents

Abstract

The present invention relates to a wireless charging system and method for electric scooters for vehicles.
In addition, the present invention is a wireless charging system for an electric scooter for a vehicle that includes a wireless power receiver mounted on an electric scooter and a wireless power transmitter mounted on a vehicle, wherein the wireless power receiver includes a receiving pad that wirelessly receives power, and a receiving pad A receiving-side capacitance matching unit that is connected and has a plurality of capacitors and a plurality of switches, a receiving-side sensor unit that detects the receiving power received by the receiving pad, and a wireless power transmitting unit that receives information about the transmitting power of the transmitting pad. By providing a receiving-side communication unit and a receiving-side control unit that determines the optimal capacitance of the receiving-side capacitance matching unit using the receiving power and transmitting power and controls the receiving-side capacitance matching unit based on the optimal capacitance to adjust the resonance frequency of the receiving pad, Not only can you charge the electric scooter's battery wirelessly while moving to the vicinity of your destination with the electric scooter stored in the vehicle, but even if the position of the electric scooter changes, the resonance frequency is adjusted to compensate for transmission efficiency, ensuring that the electric scooter always remains at its maximum level. Electric scooters can be charged wirelessly with a transmission efficiency of .

Description

{Wireless charging system and method for electric scooter of vehicle}

The present invention relates to a wireless charging system and method for electric scooters for vehicles.

In general, electric scooters are used to travel short distances that are difficult to reach by public transportation or vehicles, and the number of users who use electric scooter rental services or purchase electric scooters is increasing.

In addition, the vehicle manufacturer provides an option to give an electric scooter along with the vehicle when purchasing the vehicle, so you can store the electric scooter in the vehicle, move to the vicinity of your destination, and then use the electric scooter from where the vehicle is parked to the destination. So that it can be moved.

On the other hand, since electric scooters can be charged through a charging system installed at home or at a charging station, there is a problem in that it is impossible to charge the electric scooter while it is stored in a vehicle and moving to the vicinity of the destination.

This causes the inconvenience of having to charge the electric scooter in advance before moving to the destination, and if the battery of the electric scooter is not sufficiently charged, it becomes impossible to ride the electric scooter to the destination.

Accordingly, vehicle manufacturers are developing charging systems that can charge electric bicycles or electric scooters in vehicles. Among these, there is a charging system that charges electric scooters using the vehicle's 12V cigarette lighter jack.

However, in the conventional charging system using a cigarette lighter, situations in which normal charging is difficult often occur because the cigarette lighter is dislodged or the contact becomes unstable due to vibration or impact when the vehicle is moved, and due to the weak durability of the cigarette lighter connector, frequent charging is difficult. It needs to be replaced and is structurally vulnerable to fire.

In addition, research and development are being conducted to apply wireless charging technology to charge electric scooters in vehicles. However, in this case, because the position of the electric scooter changes due to vibration or movement of the vehicle, wireless charging does not occur normally. There is a problem that it is difficult and the transmission efficiency of wireless power is reduced.

The present invention was developed in consideration of the above problems, and is a wireless charging system for an electric scooter for a vehicle that can wirelessly charge an electric scooter with maximum transmission efficiency even if the position of the electric scooter changes due to vibration or movement of the vehicle. The purpose is to provide a method.

The objects of the present invention are not limited to the objects mentioned above, and other objects not mentioned will be clearly understood by those skilled in the art from the description below.

The present invention for achieving the above object is a wireless charging system for an electric scooter for a vehicle including a wireless power receiver mounted on an electric scooter and a wireless power transmitter mounted on a vehicle, wherein the wireless power receiver receives power wirelessly. receiving pad; a receiving-side capacitance matching unit connected to the receiving pad and including a plurality of capacitors and a plurality of switches; a receiving side sensor unit that detects receiving power received by the receiving pad; a receiving side communication unit that receives information about the transmission power of the transmission pad from the wireless power transmission unit; And a receiving-side control unit that determines the optimal capacitance of the receiving-side capacitance matching unit using the receiving power and transmitting power, and controls the receiving-side capacitance matching unit based on the optimal capacitance to adjust the resonance frequency of the receiving pad. Provides a wireless charging system for electric scooters for vehicles.

In a preferred embodiment, the receiving side control unit changes the capacitance of the receiving side capacitance matching unit multiple times to obtain transmission and reception efficiency according to the ratio between transmission power and reception power, and determines the capacitance with the highest transmission and reception efficiency as the optimal capacitance. do.

In a preferred embodiment, the receiving capacitance matching unit includes a plurality of capacitors connected in parallel, and a switch is connected in series to each capacitor.

In a preferred embodiment, the receiving capacitance matching unit changes capacitance by opening or shorting at least one switch among a plurality of switches.

In a preferred embodiment, the receiving side control unit monitors whether an error occurs, a request to stop charging, and whether the battery is fully charged, and ends charging when an error occurs, a request to stop charging is received, or the battery of the electric scooter is fully charged.

In a preferred embodiment, the wireless power transmitter includes a transmission pad that transmits power wirelessly; a transmission-side capacitance matching unit connected to the transmission pad and including a plurality of capacitors and a plurality of switches; a transmitting side sensor unit that detects transmission power transmitted from the transmitting pad; a transmission-side communication unit that transmits information about the transmission power of the transmission pad to the wireless power receiver and receives information about the reception power of the reception pad from the wireless power reception unit; And a transmission-side control unit that determines the optimal capacitance of the transmission-side capacitance matching unit using reception power and transmission power, and controls the transmission-side capacitance matching unit based on the optimal capacitance to adjust the resonance frequency of the transmission pad. .

In addition, the present invention is a method of wirelessly charging an electric scooter for a vehicle performed in a wireless charging system for an electric scooter for a vehicle including a wireless power receiver mounted on an electric scooter and a wireless power transmitter mounted on a vehicle, wherein the wireless charging system for an electric scooter for a vehicle includes, A monitoring step of monitoring reception power received by the reception pad; An information transmission and reception step of transmitting information about the reception power of the reception pad to the wireless power transmitter and receiving information about the transmission power of the transmission pad from the wireless power transmission unit; An optimal capacitance determination step of determining the optimal capacitance using reception power and transmission power; and an adjustment step of adjusting the resonance frequencies of the receiving pad and the transmitting pad based on optimal capacitance.

In a preferred embodiment, in the step of determining the optimal capacitance, transmission and reception efficiency is obtained according to the ratio between transmission power and reception power while changing the capacitance multiple times, and the capacitance with the highest transmission and reception efficiency is determined as the optimal capacitance.

In a preferred embodiment, the method further includes monitoring whether an error occurs, a request to stop charging, and whether the battery is fully charged, and terminating charging when an error occurs, a request to stop charging is received, or the battery of the electric scooter is fully charged.

By means of the above-mentioned problem solving means, the present invention enables charging the electric scooter battery by receiving wireless power transmitted from the transmitting pad of the vehicle at the receiving pad of the electric scooter, so that the electric scooter can be stored near the destination while the electric scooter is stored in the vehicle. It has the effect of wirelessly charging the battery of an electric scooter while moving.

In addition, in the present invention, when the coupling coefficient between the transmitting pad and the receiving pad changes as the position of the electric scooter changes due to vibration or impact due to the driving of the vehicle, and the transmission efficiency of wireless power decreases, the transmission efficiency of wireless power is reduced based on the receiving power and the transmitting power. By determining the optimal capacitance and adjusting the resonance frequency to compensate for transmission efficiency, it is possible to wirelessly charge the electric scooter with maximum transmission efficiency even if the position of the electric scooter changes.

1 is a diagram illustrating a wireless charging system for an electric scooter for a vehicle according to an embodiment of the present invention.
Figure 2 is a diagram illustrating a capacitance matching unit on the receiving side of a wireless charging system for an electric scooter for a vehicle according to an embodiment of the present invention.
Figures 3 and 4 are diagrams for explaining a wireless charging method for an electric scooter for a vehicle according to an embodiment of the present invention.

In the following description, specific details of the present invention are set forth to provide a general understanding of the present invention; however, it is known to those skilled in the art that the present invention can be readily practiced without these specific details and with modifications thereof. It will be self-evident to those who have it.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the accompanying FIGS. 1 to 4, focusing on the parts necessary to understand the operation and action according to the present invention.

Figure 1 is a diagram for explaining a wireless charging system for an electric scooter for a vehicle according to an embodiment of the present invention, and Figure 2 is a diagram for explaining a capacitance matching unit on the receiving side of a wireless charging system for an electric scooter for a vehicle according to an embodiment of the present invention. It is a drawing.

Referring to FIGS. 1 and 2 , the electric scooter wireless charging system 1000 for a vehicle according to an embodiment of the present invention includes a wireless power receiving unit 100 and a wireless power transmitting unit 200.

The wireless charging system 1000 for an electric scooter for a vehicle according to an embodiment of the present invention allows charging the battery 10 of the electric scooter while the electric scooter is stored in the vehicle, even while the vehicle is driving. It is possible to charge the electric scooter, and the battery (10) of the electric scooter is charged using a wireless charging method without the need to connect the vehicle's cigarette lighter jack or power cable, which not only improves user convenience but also allows charging by removing the cigarette lighter jack or power cable. Fires caused by interruption or poor contact can be prevented.

The wireless power receiving unit 100 is provided on an electric scooter and includes a receiving pad 110, a receiving-side capacitance matching unit 120, an AC/DC converter 130, a receiving-side sensor unit 140, and a receiving-side input unit. It may be configured to include (150), a receiving-side communication unit 160, a receiving-side display unit 170, and a receiving-side control unit 180.

The receiving pad 110 receives power transmitted wirelessly from the transmitting pad 210.

The receiving pad 110 may be formed to include one or more coils for receiving wirelessly transmitted power, and may receive power through magnetic inductive coupling or resonant magnetic coupling. can do.

The receiving capacitance matching unit 120 is connected to the receiving pad 110 and is provided to allow adjustment of capacitance, and includes a plurality of capacitors (C1, C2, C3, Cn) and a plurality of switches (S1, S2, S3). , Sn).

As shown in FIG. 2, the receiving capacitance matching unit 120 has a plurality of capacitors (C1, C2, C3, Cn) connected in parallel, and a plurality of switches (S1, S2, S3, Sn) each connected in parallel. It is formed in a structure that connects the capacitor and the receiving pad 110 in series.

The receiving capacitance matching unit 120 adjusts the connection state of the capacitors C1, C2, C3, and Cn by opening or shorting at least one switch among the plurality of switches S1, S2, S3, and Sn. You can change the capacitance in this way.

For example, the receiving capacitance matching unit 120 is formed in a structure where one capacitor is connected when one switch is opened, and N capacitors are connected when N switches are opened, so capacitors are connected as many as the number of open switches. Capacitance changes according to the number of capacitors connected.

In this way, the receiving capacitance matching unit 120 changes the capacitance when the coupling coefficient between the transmitting pad 210 and the receiving pad 110 changes due to vibration or impact while the vehicle is running, and the transmission efficiency of wireless power decreases. This allows impedance matching to be achieved or the resonance frequency to be adjusted.

For reference, the above-mentioned coupling coefficient is a value indicating the degree of electromagnetic coupling between the transmitting pad 210 and the receiving pad 110, and is at least one of the distance, direction, and position of the transmitting pad 210 and the receiving pad 110. For example, when the position of the electric scooter changes due to vibration or impact while driving the vehicle, a change in position occurs between the receiving pad 110 provided on the electric scooter and the transmitting pad 210 provided on the vehicle. Coupling coefficients may vary.

Meanwhile, when at least one switch provided in the receiving capacitance matching unit 120 is opened, the receiving power received by the receiving pad 110 may be output to the AC/DC converting unit 130.

The AC/DC conversion unit 130 is connected to the receiving capacitance matching unit 120 and converts the received power output from the receiving capacitance matching unit 120 from alternating current to direct current.

The direct current power converted by the AC/DC converter 130 is output to the battery 10 of the electric scooter to charge the battery 10 of the electric scooter.

The receiving side sensor unit 140 detects the receiving power received by the receiving pad 110.

The receiving-side sensor unit 140 can detect the received power by detecting the input power and output power of the receiving-side capacitance matching unit 120 connected to the receiving pad 110.

In addition, the receiving-side sensor unit 140 is disposed at the input and output terminals of the receiving-side capacitance matching unit 120, respectively, and detects the voltage and current corresponding to the input power and detects the voltage and current corresponding to the output power to receive It can be output to the side control unit 180.

The receiving side input unit 150 is for receiving a user input instructing to start or stop wireless charging, and may be formed in the form of an input button, switch, or touch panel, and receives the input user input from the receiving side control unit 180. ) can be provided to output.

The receiving side communication unit 160 is for communication with the wireless power transmission unit 200 provided in the vehicle, and is configured to communicate using a short-range wireless communication method including Wi-Fi and Bluetooth.

The receiving communication unit 160 can communicate with the wireless power transmitting unit 200 to check whether wireless charging is possible and receive a response, and can request wireless charging and receive a response.

In addition, the receiving side communication unit 160 transmits information about the reception state of radio power, for example, received power, to the wireless power transmitter 200 and transmits information about the radio power transmission state, for example, transmission power, from the wireless power transmitter 200. Information about the amount of charge charged in the battery 10 of the electric scooter can be transmitted to the wireless power transmitter 200.

In addition, when an error occurs during the wireless charging process, the receiving side communication unit 160 transmits information about the error state to the wireless power transmitter 200, and when an error occurs in the wireless power transmitter 200, the wireless power transmitter 200 ) You can receive information about the error status from .

In addition, the receiving communication unit 160 communicates with the wireless power transmitting unit 200 to transmit information on whether the battery 10 of the electric scooter is fully charged, and receives information on whether wireless charging is interrupted and communication is terminated. A response can be sent.

The display unit 170 on the receiving side is for displaying information about wireless charging and may be provided with an LED or LCD.

When wireless charging starts, the receiving side display unit 170 displays that wireless charging has started, and if wireless charging is not possible depending on the state of the vehicle's battery 20, it displays that wireless charging is impossible. While wireless charging is in progress, the display unit 170 on the receiving side displays that wireless charging has started. The charging amount of the electric scooter's battery 10 can be displayed, and an error state can be displayed if an error occurs during the wireless charging process.

Additionally, when wireless charging is stopped or the battery 10 of the electric scooter is fully charged, the display unit 170 on the receiving side may display whether wireless charging is stopped or whether the battery is fully charged.

The receiving side control unit 180 controls wireless charging of the electric scooter, and when a change in position occurs between the transmitting pad 210 and the receiving pad 110, the wireless power is adjusted by adjusting the resonance frequency of the receiving pad 110. Control the transmission efficiency to be maintained at the maximum or above a certain level.

For reference, when wirelessly charging the electric scooter's battery (10) while moving to the vicinity of the destination with the electric scooter stored in the vehicle, vibration or shock due to the driving of the vehicle is transmitted to the electric scooter, so the electric scooter and the vehicle may be affected. Changes in the positions of the receiving pad 110 and the transmitting pad 210 may occur. As a result, the coupling coefficient between the transmitting pad 210 and the receiving pad 110 may change, which may reduce the transmission efficiency of wireless power. there is.

Therefore, when it is confirmed that a position change has occurred, the receiving side control unit 180 determines the optimal capacitance corresponding to the current position based on the receiving power and the transmitting power, and the receiving side capacitance matching unit 120 based on the optimal capacitance. is controlled to adjust the resonance frequency of the receiving pad 110.

Specifically, the receiving-side control unit 180 changes the capacitance of the receiving-side capacitance matching unit 120 multiple times by opening or shorting the switches of the receiving-side capacitance matching unit 120 to adjust the connection state of the capacitor, Each time the capacitance of the receiving capacitance matching unit 120 is changed, transmission and reception efficiency is obtained according to the ratio between transmission power and reception power.

In addition, the receiving side control unit 180 sequentially opens the switches of the receiving side capacitance matching unit 120 one by one to obtain transmission and reception efficiency to obtain N transmission and reception efficiencies corresponding to N capacitors, that is, transmission and reception efficiency for each capacitance. Among these, the capacitance with the greatest transmission and reception efficiency can be determined as the optimal capacitance.

Additionally, the receiving side control unit 180 opens the switches of the receiving side capacitance matching unit 120 by the number of switches corresponding to the optimal capacitance, thereby adjusting the existing resonance frequency of the receiving pad 110 connected to the receiving side capacitance matching unit 120. can be adjusted to the resonance frequency corresponding to the optimal capacitance.

By adjusting this resonance frequency, the transmission efficiency of wireless power, which has been reduced due to changes in the positions of the receiving pad 110 and the transmitting pad 210, can be increased, and this process is performed by the transmitting pad 210 and the receiving pad 110. ), the transmission efficiency of wireless power can be controlled to always be maintained at the maximum or above a certain level by repeating the process whenever the transmission efficiency changes or decreases.

Meanwhile, the receiving side control unit 180 may control the overall process for wireless charging of the electric scooter.

For example, when a user input instructing wireless charging is input to the receiving side input unit 150, the receiving side control unit 180 checks whether wireless charging is possible through the receiving side communication unit 160, and wirelessly When a response that charging is possible is received, wireless charging is requested and wireless charging is started according to the response to charge the battery 10 of the electric scooter.

Of course, if the receiving side control unit 180 receives a response from the wireless power transmitting unit 200 that wireless charging is not possible, it may not proceed with wireless charging.

Additionally, the receiving side control unit 180 can monitor the received power received by the receiving pad 110 and the amount of charge charged to the battery 10 of the electric scooter while wireless charging is in progress.

In addition, the receiving side control unit 180 transmits information about the received power of the receiving pad 110 and the charging amount of the battery 10 of the electric scooter to the wireless power transmitting unit 200 through the receiving side communication unit 160. It monitors whether an error occurs during the charging process, and if it is necessary to stop wireless charging due to an error, information about the error state can be transmitted to the wireless power transmitter 200 and then wireless charging can be stopped.

In addition, when a user input instructing to stop wireless charging is input to the receiving input unit 150 or the battery 10 of the electric scooter is fully charged, the receiving side control unit 180 determines whether to stop charging through the receiving side communication unit 160. Alternatively, you can notify whether the device is fully charged and end wireless charging and communication.

The wireless power transmission unit 200 is provided in a vehicle and includes a transmission pad 210, a DC/AC conversion unit 220, a transmission-side capacitance matching unit 230, a transmission-side sensor unit 240, and a transmission-side input unit ( 250), a transmitting-side communication unit 260, a transmitting-side display unit 270, and a transmitting-side control unit 280.

The transmitting pad 210 transmits wireless power to the receiving pad 110 of the electric scooter.

The transmission pad 210 may be formed to include one or more coils for transmitting wireless power, and may be formed using an inductive coupling or a resonant method, similar to the above-described receiving pad 110. Wireless power can be transmitted using magnetic coupling.

The DC/AC conversion unit 220 connects the vehicle battery 20 and the transmission side capacitance matching unit 230, and converts the power supplied from the vehicle battery 20 from direct current to alternating current to change the transmission side capacitance. It is output from the matching unit 230.

This DC/AC converter 220 can convert 800V or 400V direct current power into alternating current power.

The transmission-side capacitance matching unit 230 is connected to the DC/AC conversion unit 220 and the transmission pad 210 and is provided to allow adjustment of capacitance. Although there is a difference in installation location, see FIG. 2. Since it can be configured in the same way as the receiving-side capacitance matching unit 120 described above, redundant description will be omitted.

The transmitting side sensor unit 240 detects transmission power transmitted from the transmitting pad 210.

This transmission-side sensor unit 240 is disposed at the input and output terminals of the transmission-side capacitance matching unit 230, respectively, and connects the input power converted to alternating current from the DC/AC converter 220 and the transmission-side capacitance matching unit. Transmission power can be detected by detecting the output power output from 230 to the transmission pad 210.

The transmitting side input unit 250 is formed in the form of an input button, switch, or touch panel, and receives a user input instructing to start or stop wireless charging and outputs it to the transmitting side control unit 280.

The transmitting communication unit 260 is for communication with the wireless power receiving unit 100 and may include one or more components that enable communication with the wireless power receiving unit 100.

The transmitting side communication unit 260 communicates with the wireless power receiving unit 100, transmits a response as to whether wireless charging is possible and a response to the wireless charging request, receives information about the received power and charging amount, and transmits the transmitted power. Information about can be transmitted.

Additionally, the transmitting-side communication unit 260 can transmit or receive information about an error state, and can transmit a response to a request to stop charging and a response to whether the device is fully charged.

The transmitting side display unit 270 is intended to display information about wireless charging, and may be provided in the cluster of a vehicle. It displays whether wireless charging has started, an error state, and charging has stopped, and displays the battery of the electric scooter (10). ) can display the charging amount and whether it is fully charged.

The transmission-side control unit 280 controls the DC/AC conversion unit 220, the transmission-side capacitance matching unit 230, and the transmission-side display unit 270, and performs the function of adjusting the resonance frequency of the transmission pad 210. do.

Except that the transmission-side control unit 280 is installed in the vehicle, the switches of the transmission-side capacitance matching unit 230 are sequentially opened one by one to obtain transmission and reception efficiency corresponding to each capacitance, and among these, the transmission and reception efficiency is This largest capacitance is determined as the optimal capacitance, and the resonance frequency can be adjusted by opening the switches of the transmitting capacitance matching unit 230 by the number of switches corresponding to the optimal capacitance.

In addition, the transmitting-side control unit 280 controls the wireless charging to start or stop according to the user input input to the transmitting-side input unit 250 and controls the DC/AC converter 220 so that wireless power can be transmitted. You can.

In addition, the transmitting side control unit 280 checks the battery status through the vehicle's battery 20 management system (BMS, 30) to determine whether wireless charging is possible, and determines whether wireless charging is possible through the transmitting side communication unit 260. Transmits a response, controls the DC/AC converter 220 and the transmitting capacitance matching unit 230 to start wireless charging according to the wireless charging request, and monitors the transmitting power of the transmitting pad 210 to the wireless power receiving unit. It can be controlled to transmit to (100).

In addition, the transmitting side control unit 280 monitors whether an error occurs during the wireless charging process, and when an error occurs, the wireless charging can be stopped while transmitting information about the error state to the wireless power receiving unit 100, and the battery of the electric scooter By confirming that (10) is fully charged, wireless charging can be stopped and communication terminated.

Below, a method of wirelessly charging an electric scooter for a vehicle performed in the wireless charging system for an electric scooter for a vehicle 1000 according to an embodiment of the present invention will be described.

Figures 3 and 4 are diagrams for explaining a wireless charging method for an electric scooter for a vehicle according to an embodiment of the present invention.

However, since all functions performed in the wireless charging method for electric scooters for vehicles shown in FIGS. 3 and 4 are performed in the wireless charging system for electric scooters for vehicles 1000 described with reference to FIGS. 1 and 2, even without explicit explanation, All functions described with reference to FIGS. 1 and 2 are performed in the wireless charging method for an electric scooter for a vehicle according to a preferred embodiment of the present invention, and all functions described with reference to FIGS. 3 and 4 are performed in the preferred embodiment of the present invention. It should be noted that this is performed as is in the electric scooter wireless charging system for vehicles (1000).

Referring to Figures 3 and 4, when a user input instructing wireless charging is input, the receiving side control unit 180 of the wireless power receiving unit 100 checks whether wireless charging is possible (S110) and determines that wireless charging is possible. If confirmed (S120), wireless charging is requested from the wireless power transmitter 200 (S130).

In step S110, the receiving side control unit 180 checks with the wireless power transmitter 200 whether wireless charging is possible. At this time, the transmitting side control unit 280 of the wireless power transmitter 200 controls the vehicle battery 20. When the battery status is requested from the management system (BMS, 30) and confirmed to be normal, a response indicating that wireless charging is possible is sent to the wireless power receiver 100. If the battery status is abnormal, a response indicating that wireless charging is not possible is sent to the wireless power receiver. It can be transmitted to the receiving unit 100.

In step S120, when the receiving side control unit 180 receives a response from the wireless power transmitter 200 that wireless charging is not possible, charging may be terminated according to step S510, which will be described later.

Next, the receiving side control unit 180 receives wireless power through the receiving pad 110 and monitors the received power of the receiving pad 110 while charging the battery 10 of the electric scooter (S210).

In step S210, the receiving side control unit 180 monitors the received power using the input power and output power detected by the receiving side sensor unit 140. The above-described receiving side sensor unit 140 monitors the receiving pad 110. ) can be detected at the input and output terminals of the receiving-side capacitance matching unit 120 connected to the voltage and current, respectively, and output them to the receiving-side control unit 180.

Meanwhile, the transmission side control unit 280 of the wireless power transmission unit 200 monitors the transmission power transmitted from the transmission pad 210 using the transmission side sensor unit 240.

Next, the receiving side control unit 180 transmits information about the received power of the receiving pad 110 to the wireless power transmitting unit 200, and receives information about the transmitting power of the transmitting pad 210 from the wireless power transmitting unit 200. Receive (S220).

At this time, the receiving side control unit 180 may transmit information about the amount of charge charged in the battery 10 of the electric scooter to the wireless power transmitter 200 along with information about the received power.

Next, the receiving side control unit 180 adjusts the resonance frequency of the receiving pad 110 depending on whether the position between the transmitting pad 210 and the receiving pad 110 changes (S310).

In step S310, the receiving side control unit 180 determines the optimal capacitance corresponding to the current location based on the receiving power and the transmitting power, and controls the receiving side capacitance matching unit 120 based on the optimal capacitance. The resonance frequency of the pad 110 can be adjusted.

Specifically, as shown in FIG. 4, the receiving side control unit 180 checks whether the positions of the transmitting pad 210 and the receiving pad 110 have changed (S311), and when it is confirmed that a position change has occurred (S312) , sequentially opening the switches of the receiving capacitance matching unit 120 one by one to obtain transmission and reception efficiency for each capacitance (S313), determining the capacitance with the highest transmission and reception efficiency as the optimal capacitance (S314), and then switching the switch corresponding to the optimal capacitance. The resonance frequency of the receiving pad 110 is adjusted by opening the number of switches of the receiving capacitance matching unit 120 (S315).

In step S311, the receiving side control unit 180 checks at least one of the received power, the coupling coefficient, and the transmission efficiency, and if the received power decreases, the coupling coefficient changes, or the transmission efficiency of wireless power decreases, the transmission pad 210 and It may be determined that the position of the receiving pad 110 has changed.

In step S312, if the transmitting pad 210 and the receiving pad 110 maintain their original positions, the receiving side control unit 180 may perform step S410 without separately performing steps S313 to S315.

In step S313, the receiving side control unit 180 changes the capacitance multiple times by adjusting the connection state of the capacitor by opening or shorting the switches of the receiving side capacitance matching unit 120, and each time the capacitance is changed, the transmission power and By obtaining transmission and reception efficiency according to the ratio between reception powers, it is possible to obtain N transmission and reception efficiencies corresponding to N capacitors, that is, transmission and reception efficiency for each capacitance.

In step S314, the receiving side control unit 180 may check the largest transmission and reception efficiency among the N transmission and reception efficiencies, and determine the capacitance when it has the greatest transmission and reception efficiency as the optimal capacitance.

By adjusting the resonance frequency, the transmission efficiency of wireless power, which has been reduced due to changes in the positions of the receiving pad 110 and the transmitting pad 210, can be increased, so the transmission efficiency of wireless power is always maintained at the maximum or above a certain level. You can.

Meanwhile, depending on whether the position between the transmitting pad 210 and the receiving pad 110 changes, the resonance frequency of the transmitting pad 210 may be adjusted by the transmitting side control unit 280 of the wireless power transmitting unit 200.

Next, the receiving side control unit 180 monitors whether an error has occurred, a request to stop charging, and whether the charge is fully charged (S410). If an error has occurred (S420), or a user input requesting to stop wireless charging is received, the receiving side input unit (S410) 150) or when it is confirmed that the battery 10 of the electric scooter is fully charged (S440), wireless charging is terminated in step S510.

In step S420, the receiving side control unit 180 may transmit information about the error state to the wireless power transmitter 200, and conversely, it may receive information about the error state generated from the wireless power transmitter 200.

In step S430, the receiving side control unit 180 may receive a request from the wireless power transmitting unit 200 to stop wireless charging.

Meanwhile, if the battery 10 of the electric scooter is not fully charged without an error occurring and without a request to stop charging, the receiving side control unit 180 receives wireless power according to the above-described S210 and charges the battery of the electric scooter. The process of charging (10) is repeated again.

Next, the receiving side control unit 180 short-circuits the switches of the receiving side capacitance matching unit 120 to disconnect it, stops the operation of the AC/DC converter 130, and then connects the wireless power transmitting unit 200 and the wireless power Communication between the receiving units 100 is released and charging is terminated (S510).

At this time, the transmitting-side control unit 280 can also stop the operation of the DC/AC converter 220 and short-circuit the switches of the transmitting-side capacitance matching unit 230 to release the connection, then disconnect communication and terminate charging. .

In the above, preferred embodiments of the present invention have been described by way of example, but the scope of the present invention is not limited to these specific embodiments, and may be appropriately modified within the scope stated in the claims.

1000: Electric scooter wireless charging system for vehicles
100: wireless power receiver
110: Receiving pad 120: Receiving capacitance matching unit
130: AC/DC conversion unit 140: Receiving sensor unit
150: Receiving input unit 160: Receiving communication unit
170: Receiving side display unit 180: Receiving side control unit
200: wireless power transmitter
210: Transmission pad 220: DC/AC conversion unit
230: Transmission side capacitance matching unit 240: Transmission side sensor unit
250: Transmission side input unit 260: Transmission side communication unit
270: transmitting side display unit 280: transmitting side control section

Claims (9)

delete delete delete delete delete delete A wireless charging method for a vehicle electric scooter performed in a vehicle electric scooter wireless charging system including a wireless power receiver mounted on the electric scooter and a wireless power transmitter mounted on the vehicle, comprising:
A monitoring step in which the electric scooter wireless charging system for vehicles monitors received power received by the receiving pad;
An information transmission and reception step of transmitting information about the reception power of the reception pad to the wireless power transmitter and receiving information about the transmission power of the transmission pad from the wireless power transmission unit;
An optimal capacitance determination step of determining the optimal capacitance using reception power and transmission power; and
A wireless charging method for an electric scooter for a vehicle comprising: an adjustment step of adjusting the resonance frequencies of the receiving pad and the transmitting pad based on optimal capacitance.
According to clause 7,
The optimal capacitance determination step is,
A wireless charging method for an electric scooter for a vehicle, characterized by changing the capacitance multiple times to obtain transmission and reception efficiency according to the ratio between transmission and reception power, and determining the capacitance with the greatest transmission and reception efficiency as the optimal capacitance.
According to clause 7,
Wireless charging for an electric scooter for a vehicle, further comprising monitoring whether an error occurs, a request to stop charging, and whether the battery is fully charged, and terminating charging when an error occurs, a request to stop charging is received, or the battery of the electric scooter is fully charged. method.

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