KR102293173B1 - Wireless power transmitting cradle for vehicle - Google Patents

Abstract

The present invention, having a support body having a first connection portion, a support unit; and a charging body having a second connection part rotatably connected to the first connection part; It provides a vehicle cradle for wireless power transmission, including a charging unit, having an output module for transmitting to the wireless power receiver fixed to the adsorption module.

Description

Vehicle cradle for wireless power transmission {WIRELESS POWER TRANSMITTING CRADLE FOR VEHICLE}

The present invention relates to a cradle for a vehicle for transmitting wireless power.

In general, a rechargeable secondary battery is mounted as a battery in portable electronic devices such as mobile communication terminals and personal digital assistants (PDAs). In order to charge the battery, a separate charging device for providing electric energy to the battery of the portable electronic device using a household commercial power source is required.

In general, the charging device and the battery each have separate contact terminals on the outside, so that the charging device and the battery are electrically connected by connecting the two contact terminals to each other. However, when the contact terminal protrudes to the outside as described above, the appearance is not good and the contact terminal is contaminated with foreign substances, and thus the contact state is easily deteriorated. In addition, if the battery is short-circuited or exposed to moisture due to the user's carelessness, charging energy may be easily lost.

As an alternative to the contact-type charging method, a wireless power charging system in which power transfer is performed wirelessly so that the battery is charged in such a way that the contact terminals of the charging device and the battery do not contact each other has been proposed.

Such a wireless power charging system is typically placed on a desk or table, etc., but may be used in a vehicle. In this regard, in the current vehicle, a separate structure capable of wireless power charging while being able to easily mount a wireless power receiver such as a portable electronic device is not provided. Accordingly, it is not easy for the user to wirelessly charge the portable electronic device. In addition, when viewing a video or the like through a display of a portable electronic device mounted inside a vehicle, it is necessary to change the output direction of the display according to the direction in which the occupant looks. In this case, the portable electronic device for the wireless power charging system There is a point that it is difficult to stably supply wireless power due to the change in the arrangement of the device.

In addition, vibration of the vehicle is generated while driving due to vibration of the engine or unevenness of the road surface. Such vibration may be transmitted to the inside of the vehicle, and may also be transmitted to a wireless power charging system installed inside the vehicle and a portable electronic device mounted thereon. In this case, the portable electronic device may not be properly positioned in the wireless power charging system due to vibration of the vehicle, thereby reducing charging efficiency. Accordingly, the wireless power charging system installed in the vehicle needs to be configured to stably fix the portable electronic device even when vibration occurs.

It is an object of the present invention to freely change the arrangement state of the wireless power receiver being charged while performing wireless charging for the wireless power receiver, and to be able to simply and stably fix and mount the wireless power receiver, It is to provide a vehicle cradle for wireless power transmission.

The cradle for a vehicle for wireless power transmission related to an embodiment of the present invention for realizing the above object includes a support unit having a support body having a first connection part; and a charging body having a second connection part rotatably connected to the first connection part; It may include a charging unit having an output module that transmits to the wireless power receiver fixed to the adsorption module.

Here, the support unit may include: a connection jack formed to be connected to a power jack of the vehicle; and a first terminal installed in the first connection part and electrically connected to the connection jack, wherein the charging unit further includes a second terminal installed in the second connection part and connected to the first terminal, , the output module may be configured to receive the power through the second terminal.

Here, the charging body may further include a housing having an accommodating part, and the output module may be embedded in the accommodating part.

Here, the adsorption module may include: a suction pad disposed to be exposed to the outside of the housing; a central member passing through the housing and connected to the suction pad; and an operation lever connected to the central member to pull the central member.

Here, the charging body may include an opening formed in the housing and communicating with the accommodating part; and an end portion of the housing forming the opening, wherein the suction pad is disposed to be spaced apart from the end portion on the outside of the opening, and when the center member is pulled by the operation lever, the end portion It may be formed so as to be in contact with the wealth.

Here, the end portion may be formed to form a closed loop on one plane.

Here, the adsorption module may further include an elastic body having both ends fixed to the inner surface of the accommodating part and the adsorption pad, respectively.

Here, the output module may include: a transmitting coil oscillating the wireless power signal and having a central hole through which the central material passes; and a transmission control unit for controlling oscillation of the wireless power signal by the transmission coil.

Here, the output module may further include a substrate on which the transmission control unit is installed and which is installed on any one of the receiving unit and the support body.

Here, the charging unit may further include a light emitting unit for displaying the transmission state of the output module under the control of the transmission control unit.

Here, the support body may include: a support module having a support surface supported by the vehicle; and an extension portion extending from the support module to the first connection portion.

Here, the support module may include: a housing connected to the extension part; a suction pad overlapping the support surface; a central member passing through the housing and connected to the suction pad; and an operation lever connected to the central member to pull the central member.

Here, the first connection portion, a spherical head portion; and a neck portion extending from the head portion and having a cross-sectional area smaller than a maximum cross-sectional area of the head portion, wherein the second connection portion includes: a recess portion formed to accommodate the head portion; It is formed to protrude to surround the recess, and may include a side wall portion having a hook portion caught on the neck portion.

Here, the first terminal may include: a free terminal formed at a free end of the head part; and a ring terminal formed in a ring shape along the circumference of the maximum cross-sectional area of the head portion, wherein the second terminal is formed in the center of the recess portion and is connected to the free terminal; and an inner peripheral terminal formed along the circumferential direction on the inner peripheral surface of the side wall portion and connected to the ring terminal.

Here, the side wall portion may include an outer circumferential thread formed on an outer circumferential surface, and the second connection portion may further include a tightening pipe having a hollow portion and having an inner circumferential thread screw-coupled to the outer circumferential screw thread in the hollow portion. have.

According to the vehicle cradle for wireless power transmission related to the present invention configured as described above, since the support unit and the charging unit are rotatably connected to each other, even when the wireless power receiving device is wirelessly charging, the arrangement state of the wireless power receiving device is maintained. be able to change freely. This increases the degree of freedom with respect to the arrangement of the wireless power receiver, thereby increasing the user's convenience in using the receiver.

In addition, since the wireless power receiver is adsorbed and fixed by the adsorption module, the fixing power is excellent and mounting is simple, and there are relatively few restrictions on the size of the wireless power receiver that can be mounted.

1 is a perspective view illustrating a state in which a wireless power receiver 300 is mounted on a charging unit 200 of a vehicle cradle 10 for wireless power transmission according to an embodiment of the present invention.
2 is an exploded perspective view of the vehicle cradle 10 for wireless power transmission of FIG. 1 .
3 is a cross-sectional view of the vehicle cradle 10 for wireless power transmission of FIG. 1 .
FIG. 4 is a block diagram illustrating wireless charging between the output module 270 of the charging unit 200 of FIG. 1 and the wireless power receiver 300 of FIG. 1 .
5 to 10 are graphs showing charging efficiency according to the degree to which the battery cell module 330 of the wireless power receiver 300 moves away from the vehicle cradle 10 for wireless power transmission of FIG. 1 .

Hereinafter, a vehicle cradle for wireless power transmission according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the present specification, the same and similar reference numerals are assigned to the same and similar components in different embodiments, and the description is replaced with the first description.

1 is a perspective view illustrating a state in which a wireless power receiver 300 is mounted on a charging unit 200 of a vehicle cradle 10 for wireless power transmission according to an embodiment of the present invention.

Referring to this drawing, the vehicle cradle 10 for wireless power transmission may be installed on the dashboard D of the vehicle. To this end, the vehicle cradle 10 for wireless power transmission may include a support unit 100 and a charging unit 200 .

The support unit 100 is a configuration supported by the dashboard (D). Specifically, the support unit 100 may include a support body 110 , a connection jack 130 , and a first terminal 150 ( FIG. 2 ). The support body 110 may be formed such that a portion (support module 115, FIG. 2 ) in contact with the dashboard D has a large cross-sectional area and a portion connected to the charging unit 200 has a relatively narrow cross-sectional area. . The connection jack 130 is connected to the power jack (P) of the vehicle, and becomes a medium for receiving the power of the vehicle. The electric wire 131 connected to the connection jack 130 extends into the support body 110 . Alternatively, the electric wire 131 may be directly connected to the charging unit 200 . The first terminal 150 serves as a medium for transmitting power input through the connection jack 130 to the charging unit 200 .

The charging unit 200 is connected to the support unit 100 and is configured to output a wireless power signal for charging the wireless power receiver 300 . The charging unit 200 may have an overall rectangular parallelepiped shape. The wireless power receiver 300 may be mounted on one side of the charging unit 200 . Specifically, the charging unit 200 may be provided with an adsorption module 250 , and the wireless power receiver 300 may be adsorbed and fixed with the adsorption module 250 . In this case, the wireless power receiver 300 may be a portable electronic device such as a mobile phone or a music player, and the size thereof may vary. A configuration for wirelessly charging the wireless power receiver 300 will be described later with reference to FIG. 4 .

The above support unit 100 and the charging unit 200 will be described in more detail with reference to FIGS. 2 and 3 .

FIG. 2 is an exploded perspective view of the vehicle holder 10 for wireless power transmission of FIG. 1 , and FIG. 3 is a cross-sectional view of the vehicle holder 10 for wireless power transmission of FIG. 1 .

Referring to the drawings, the support unit 100 may include a support body 110 , a connection jack 130 , and a first terminal 150 , as described above.

The support body 110 may include a first connection part 111 , a support module 115 , and an extension part 129 .

The first connection part 111 is located at the other end side opposite to one end at which the support module 115 is located among both ends of the extension part 129 . The first connection part 111 is configured for mechanical connection with the charging unit 200 . Specifically, the first connection part 111 may include a head part 112 and a neck part 113 . The head 112 may have a spherical shape. The neck portion 113 is a portion connecting the head portion 112 to the extension portion 129 and is formed to have a cross-sectional area smaller than the maximum cross-sectional area of the head portion 112 (the portion where the ring terminal 153 is formed).

The support module 115 is a part supported by the vehicle and may be formed to have the widest cross-sectional area among the support body 110 . As shown in FIG. 3 , the support module 115 may have a support surface 121a that is a flat surface in contact with the vehicle. The support module 115 may include a housing 117 , a suction pad 121 , a center member 123 , a manipulation lever 125 , and an elastic body 127 .

The housing 117 is connected to the extension 129 and is formed in a hemispherical shape as a whole. An opening 118 is formed at the lower end of the housing 117 . Since the opening 118 is formed to have a circular cross section, the end 119 of the housing 117 forming the opening 118 is also formed to form a circular closed loop on one plane.

The suction pad 121 is formed of a silicon material and may have a disk shape. The suction pad 121 has a gap portion 121b formed to be spaced apart from the support surface 121a at a predetermined distance in the central region. Although not shown in the drawings, a reinforcing plate may be further provided on the support surface 121a of the adsorption pad 121 to enhance the adsorption force against the vehicle. The reinforcing plate may be formed of a material having a higher coefficient of friction than the suction pad 121 , and may be formed in a circular ring shape along the circumferential direction of the suction pad 121 . The reinforcing plate may be formed of a compressed hard-type sponge material. A sponge is a porous material on a spongy surface with elasticity, and is mainly formed of synthetic resin.

The central member 123 passes through the housing 117 and is connected to the central region of the suction pad 121 .

The operation lever 125 is rotatably connected to the center member 123 . The operation lever 125 is supported on the outer surface of the housing 117 and is formed to pull the central member 123 on the principle of a lever.

The elastic body 127 is formed to surround the central member 123 , and both ends thereof are supported by the inner surface of the housing 117 and the suction pad 121 , respectively. The elastic body 127 pushes the suction pad 121 when the operation lever 125 is released so that the suction pad 121 is separated from the dashboard (D, FIG. 1).

The extension portion 129 is a portion extending from the support module 115 to the first connection portion 111 . The length of the extension portion 129 may be determined in consideration of the interval at which the charging unit 200 is to be spaced apart from the dashboard D of the vehicle.

The connection jack 130 is configured to draw power from the vehicle, as described above. The connection jack 130 is connected to the support module 115 through the electric wire 131 . Alternatively, the electric wire 131 may be directly connected to the charging unit 200 .

The first terminal 150 is installed on the first connection part 111 . The first terminal 150 is electrically connected to the connection jack 130 through the electric wire 131 . The first terminal 150 is for transmitting power input from the connection jack 130 to the charging unit 200 side. The first terminal 150 may include a free terminal 151 and a ring terminal 153 . The free terminal 151 is a terminal provided at the free end of the head part 112 . The free terminal 151 may be a disk-shaped metal. In contrast, the ring terminal 153 may be installed along the circumference of the maximum cross-sectional area of the head portion 112 . The ring terminal 153 may be formed of a ring-shaped metal. Unlike the above, the first terminal 150 may be installed in a configuration other than the first connection part 111 .

The charging unit 200 may include a charging body 210 , a second terminal 230 , an adsorption module 250 , an output module 270 , and a light emitting unit 290 .

The charging body 210 may include a cylindrical housing 213 having a receiving portion 211 . The housing 213 has an opening 215 formed in communication with the accommodating part 211 . Since the opening 215 is formed to have a circular cross section, the end 217 of the housing 213 forming the opening 215 is also formed to form a circular closed loop on one plane. The charging body 210 may include a support member 219 installed in the receiving part 211 to support the output module 270 . Also, the charging body 210 may include an installation surface 210a on which the second connection part 211 is eccentric. The second connection part 211 is configured to be mechanically coupled to the first connection part 111 of the support unit 100 . To this end, the second connection part 211 may include a recess part 212 and a sidewall part 213 . The recessed portion 212 is formed to be recessed in a hemispherical shape to accommodate the head portion 112 . The side wall portion 213 is formed to protrude from the installation surface 210a to surround the recess portion 212 . A hook portion 213a may be formed on the inner surface of the side wall portion 213 , and an outer circumferential thread 213b may be formed on the outer surface. The second connection part 211 may further include a tightening pipe 217 . The tightening pipe 217 is in the form of a pipe having a hollow portion, and an inner circumferential thread 218 is formed on the inner circumferential surface. A plurality of ribs 219 may be formed at regular intervals on the outer circumferential surface of the tightening pipe 217 .

The second terminal 230 is configured to be electrically connected to the first terminal 150 of the support unit 100 . The second terminal 230 may include a central terminal 231 and an inner peripheral terminal 233 . The central terminal 231 is formed in the center of the recessed portion 212 . To this end, the central terminal 231 may be a disk-shaped metal. The inner peripheral terminal 233 is formed along the circumferential direction on the inner peripheral surface of the side wall portion 213, and may be a metal forming a ring shape as a whole. Alternatively, the second terminal 230 may be installed in a configuration other than the second connection part 211 . For example, apart from the mechanical connection between the first connector 111 and the second connector 211 , the second terminal 230 may be directly electrically connected to the first terminal 150 .

The adsorption module 250 is a configuration for fixing the wireless power receiver 300 . The adsorption module 250 may include a suction pad 251 , a center member 253 , an operation lever 255 , and an elastic body 257 . Each of these configurations may be similar to the suction pad 121 , the center member 123 , the operation lever 125 , and the elastic body 127 of the support module 115 . Specifically, the adsorption pad 251 of the adsorption module 250 may have an adsorption surface 251a adsorbed to the wireless power receiver 300 and a gap portion 251b formed in the adsorption surface 251a. The central member 253 passes through the housing 213 and is connected to the central region of the suction pad 251 . The operation lever 255 is rotatably connected to the center member 253 and is supported on the outer surface of the housing 213 to pull the center member 253 by the principle of a lever. The elastic body 257 is formed to surround the central member 253 , and both ends thereof are supported by the inner surface of the receiving part 211 and the suction pad 251 , respectively. The elastic body 257 pushes the suction pad 251 when the operation lever 255 is released so that the suction pad 251 is separated from the wireless power receiver 300 .

The output module 270 is built in the receiving unit 211 and is configured to output a wireless power signal from power input through the second terminal 230 . At this time, the wireless power signal output from the output module 270 will proceed through the suction pad 251. The output module 270 may include a transmission coil 271 , a magnetic shield plate 275 , and a substrate 277 .

The transmission coil 271 is built into the charging body 210 and is configured to oscillate a wireless power signal. The transmitting coil 271 has a central hole 274 , and the central member 253 may be movably disposed in the central hole 274 .

The magnetic shield plate 275 is formed to cover one side of the transmission coil 271 . A control circuit such as a transmission control unit 277 is installed on the substrate 277 . The substrate 277 may be installed on the rear surface of the magnetic shield plate 275 . Alternatively, the substrate 277 may be installed on the support body 110 , and in this case, only the support unit 100 may be replaced when the substrate 277 fails to utilize the charging unit 200 as it is. The transmission control unit 277 installed on the substrate 277 controls the oscillation of the wireless power signal by the transmission coil 271 . This will be described later with reference to FIG. 4 .

The light emitting unit 290 is configured to display the transmission state of the output module 270 under the control of the transmission control unit 277 . The light emitting part 290 may be installed on the support body 110 or the charging body 210 . The light emitting unit 290 is configured to display the charging state by the output module 270 by adjusting the color and the point light shape.

Next, the output module 270 installed in the charging body 210 of the charging unit 200 of FIG. 3, and the wireless power receiving device 300 that is charged by receiving a power signal wirelessly in response to the charging unit 200 ) will be described with reference to FIG. 4 .

FIG. 4 is a block diagram illustrating wireless charging between the output module 270 of the charging unit 200 of FIG. 1 and the wireless power receiver 300 of FIG. 1 .

Referring to this drawing, the wireless power charging system according to an embodiment of the present invention includes a vehicle cradle 10 and a wireless power receiver 300 for wireless power transmission. When the vehicle cradle 10 for wireless power transmission transmits a wireless power signal to the wireless power receiving device 300 by the electromagnetic induction method, the wireless power receiving device 300 receiving this power signal The battery is charged with power, or power is supplied to an electronic device connected to the wireless power receiver 300 .

Hereinafter, the operating relationship between the vehicle cradle 10 for wireless power transmission, specifically, the output module 270 of the charging unit 200, and the wireless power receiver 300 will be described respectively.

The output module 270 includes a primary side coil 271 , a transmission control unit 277 , and an AC/DC converter 283 .

The primary side coil 271 refers to the above-described transmitting coil 271 . The primary coil 271 transmits a power signal to the secondary coil 310 of the wireless power receiver 300 in an electromagnetic induction method, and in this embodiment, two coils (that is, the first coil 272 and the second 2 coils 273] may be applied.

The transmission control unit 277 for controlling the primary side coil 271 includes an object detection unit 278 , a central control unit 279 , a switching control unit 280 , a driving driver 281 , and a series resonant converter 282 . can do.

The object detection unit 278 detects a change in the load of the primary side coil 271, and not only determines whether the load change is due to the wireless power receiver 300 (that is, has a function as an ID confirmation unit), It performs a function of filtering and processing the charging state signal transmitted from the wireless power receiver 300 . For example, when an ID signal that is a response signal of an ID call signal transmitted through the primary side coil 271 is received, it is filtered and processed. During charging, when a charging state signal including information about the battery cell module 330 or charging voltage is received, it functions to filter and process it.

The central control unit 279 receives and confirms the determination result of the object detection unit 278 , analyzes the ID signal received from the primary side coil 271 , and outputs a wireless power signal through the primary side coil 271 . It serves to transmit a power signal for the driving driver 281. In addition, when a charge state signal is received from the primary side coil 271 to be described later, it functions to control the driving driver 281 based on this to change the wireless power signal.

The switching control unit 280 controls the switching operation of the switch between the series resonant converter 282 and the first coil 272 and the second coil 273 . In the present invention, two sub-coils 272 and 273 are used, but the present invention is not limited thereto, and includes a case where one coil is applied. When one coil is applied, the switching control unit 280 becomes unnecessary.

The driving driver 281 controls the operation of the series resonant converter 282 under the control of the central control unit 279 .

The series resonant converter 282 generates output power for generating a power signal to be output under the control of the driving driver 281 and supplies it to the primary coil 271 . In other words, when the central control unit 279 transmits a power control signal for outputting a power signal having a required power value to the driving driver 281, the driving driver 281 responds to the transmitted power control signal in series resonance. By controlling the operation of the type converter 282, the series resonant converter 282 applies an output power corresponding to the power value required by the control of the driving driver 281 to the primary side coil 271, It is to output a wireless power signal of strength.

The series resonant converter 282 receives power for generating a first object detection signal and a second object detection signal through the first coil 272 and the second coil 273 under the control of the driving driver 281, respectively. serves to supply.

The AC/DC converter 283 is a device for converting an AC power of 220V or 110V into a DC power of a predetermined voltage, and as described above, an output voltage value is changed under the control of the central control unit 279 as described above.

The wireless power receiver 300 receiving power by receiving the power signal includes a secondary coil 310 that generates induced power by the output power signal, a rectifier 320 that rectifies the induced power, and the rectified power It includes a battery cell module 330 charged with , and a receiving control unit 340 for controlling the secondary side coil 310 , the rectifier 320 , and the battery cell module 330 .

The secondary side coil 310 is a component for receiving the wireless power signal transmitted from the primary side coil 271 of the output module 270 .

The rectifier 320 rectifies the wireless power received from the secondary side coil 310 into a DC voltage, and maintains a charging state with the charging voltage until charging starts.

The battery cell module 330 is a charging target that is charged through DC power from the rectifying unit 320 under the control of the reception control unit 340 . On the other hand, the battery cell module 330 includes a protection circuit such as an overvoltage and overcurrent prevention circuit and a temperature sensing circuit, and also includes a charge management module for collecting and processing information such as the state of charge of the battery cell.

The reception control unit 340 is a component that controls the current of the power charged in the rectification unit 320 so that an appropriate current flows to the battery cell module 330 .

Meanwhile, for detecting the wireless power reception signal transmitted from the wireless power reception device 300 side, for example, three sensors may be installed. Although not shown in the drawings, according to an embodiment of the present invention, a DC current sensor for measuring the DC current of the driving driver 281 and an AC current sensor for measuring the AC current and AC voltage of the primary coil 271 are , and an AC voltage sensor may be installed. That is, when a wireless power reception signal (that is, including an ID signal and a charging state signal) from the wireless power receiver 300 is received through the primary coil 271 , accordingly, in the primary coil 271 , The current and voltage and the current in the driving driver 281 are changed, and the wireless power reception signal is received by sensing this. In the present invention, it is possible to receive a more accurate wireless power reception signal using three sensors. That is, the central control unit 279 generates an error signal only when the signals from the AC current sensor, the DC current sensor, and the AC voltage sensor are all errors, and when any one of them is a normal signal, the normally received signal operation is controlled based on If two or more signals are normal signals, measure their power levels, select the best signal (the signal with the highest power level), and process the best signal to obtain a wireless reception signal, Accordingly, wireless power transmission is controlled.

By detecting using the three sensors as described above, it is possible to increase the reliability of power control even if a position change occurs while the wireless power receiver 300 is charging.

Hereinafter, the operation of the vehicle cradle 10 for wireless power transmission according to the above configuration will be described with reference to FIGS. 1 to 4 comprehensively.

First, an installation structure of the vehicle cradle 10 for wireless power transmission will be described.

The charging unit of the vehicle cradle 10 for wireless power transmission is adsorbed with the wireless power receiver 300 through the adsorption module 250 . Specifically, since the suction pad 251 is spaced apart from the distal end 217 of the housing 213 , it may be in close contact with the outer surface of the wireless power receiver 300 without being disturbed by the distal end 217 . At this time, when the user raises the operation lever 255 upward, the center member 253 is pulled toward the operation lever 255 , whereby a vacuum is formed between the suction pad 251 and the outer surface of the wireless power receiver 300 . do. In this case, the end 217 of the housing 213 comes into contact with the suction pad 251 as described above and is formed to form a circular closed loop on one plane, so that the suction pad 251 is attached to its pressure along the circumferential direction. According to this configuration, since the vacuum space formed between the suction pad 251 and the wireless power receiver 300 is strongly blocked from the outside, the wireless power receiver 300 is firmly fixed to the suction pad 251 . can

The support unit 100 is fixed to the dashboard D of the vehicle through the support module 115 . Since the support module 115 has a configuration similar to that of the adsorption module 250 as described above, it is fixed to the dashboard D through the same method as the adsorption method of the adsorption module 250 described above.

The above-described charging unit 200 is connected to the support unit 100 . This is because the first connection part 111 of the support unit 100 and the second connection part 211 of the charging unit 200 are fastened to each other. Specifically, the head part 112 of the first connection part 111 is accommodated into the recess part 212 of the second connection part 211 . At this time, the hook portion 213a of the side wall portion 213 of the second connection portion 211 is caught on the head portion 112 (specifically, the portion connected to the neck portion 113 ) of the first connection portion 111 . In this way, in a state coupled to the charging unit 200 with respect to the support unit 100 , the arrangement of the charging unit 200 may be adjusted by rotating the charging unit 200 in various directions. Accordingly, the angle of the wireless power receiver 300 seated in the charging unit 200 can be arranged in one of various arrangement forms according to the body type or preference of the vehicle user (driver or passenger). For example, if the wireless power receiver 300 is a mobile phone and an image is viewed through its display, the arrangement form of the wireless power receiver 300 desired by each user will vary. At this time, the wireless power receiver 300 is stably coupled to the charging unit 200 by the adsorption module 250 .

In order to fix the charging unit 200 with respect to the support unit 100 in one arrangement state, the tightening pipe 217 is tightened against the outer circumferential thread 213b of the side wall portion 213 so that the side wall portion 213 is connected to the head portion ( 112) can be clamped without flow. Of course, by loosening the tightening tube 217 again, the position or angle of the charging unit 200 can be adjusted.

Next, an electrical connection relationship of the vehicle cradle 10 for wireless power transmission and wireless charging of the wireless power receiver 300 through it will be described.

The connection jack 130 is connected to the power jack P of the vehicle to receive power from the vehicle. This power is supplied to the first terminal 150 connected to the connection jack 130 . Power from the first terminal 150 is supplied to the second terminal 230 connected thereto. As described above, even when the charging unit 200 is rotated at various angles with respect to the support unit 100 , the first terminal 150 installed in the first connection part 111 and the second terminal ( 130) is always in a state of being energized with each other.

The power supplied to the second terminal 230 is supplied to the AC/DC converter 283 of the output module 270 installed in the charging body 210 . This power is output as a wireless power signal by the output module 270 in a direction passing through the suction pad 251.

The wireless power receiver 300 for receiving the wireless power signal charges the battery cell module 330 as described with reference to FIG. 4 .

Hereinafter, a charging method according to a change in the mounting position of the wireless power receiver 300 with respect to the vehicle cradle 10 for wireless power transmission will be described with reference to FIGS. 5 to 10 .

5 to 10 are graphs showing charging efficiency according to the degree to which the battery cell module 330 of the wireless power receiver 300 moves away from the vehicle cradle 10 for wireless power transmission of FIG. 1 .

Specifically, while the output module 270 is operating to charge the wireless power receiver 300 , the wireless power receiver 300 on the vehicle cradle 10 for wireless power transmission, specifically, the battery cell module 330 . ) moves the position (including a change from the set position according to the size difference of the wireless power receiver 300), so that the power transmitted to the battery cell module 330 may be lower than the reference value. At this time, the wireless power receiver 300 transmits a signal to the output module 270 to reinforce and transmit it. For example, assuming that the reference voltage is 5V and the reference deviation value is 0.5V, when a voltage lower than 4.5V is received due to the movement of the battery cell module 330, the reception control unit 340 is boosted by about 0.5V and transmitted. to control the outgoing signal, and to this, the output module 270 enhances the outgoing power of the primary side coil 271 so that it is received by boosting 0.5V so that the enhanced induced magnetic field is transmitted, and the output from the output module 270 As an example of a method of enhancing the transmitted power, the oscillation frequency is changed.

As described above, as the transmission power transmitted from the output module 270 is configured to be changed, the charging efficiency with respect to the change in the distance of the battery cell module 330 from the output module 270 is shown in FIGS. 5 to 10 . That is, FIGS. 5 to 8 show the secondary-side reference power of the battery cell module 330 at about 2.5 W, and the output module 270 while moving between -7 mm and 7 mm in the horizontal and vertical directions, respectively. The primary side power (W), the secondary side power (W) and efficiency (%) in the battery cell module 330 are shown. Here, the efficiency (%) is the efficiency with respect to the output power applied to the secondary side of the battery cell module 330 with respect to the primary side input power of the output module 270 ((secondary side power / primary side power) * 100) is shown as

And the transmission power compensation according to the present embodiment was adjusted to be 0.5W, whereby the secondary-side power of the battery cell module 330 in FIGS. 5 and 7 shows a graph between 2 and 2.5 W, and the output It shows the charging efficiency when the module 270 and the battery cell module 330 are charged without changing the frequency in the output module 270 with respect to the change in the horizontal distance and the vertical distance. That is, when the battery cell module 330 is moved in the horizontal or vertical direction with respect to the output module 270 , it can be seen that the secondary-side power of the battery cell module 330 decreases as the distance from the center increases, resulting in lower efficiency.

Accordingly, in FIGS. 6 and 8 compared with FIGS. 5 and 7 , as the battery cell module 330 moves in the horizontal and vertical directions from the suction pad 251 of the vehicle cradle 10 for wireless power transmission, respectively, the battery It can be seen that the output module 270 receives the information on the change in received power from the cell module 330 and controls the power by changing the frequency. have.

And FIG. 9 is an efficiency graph for horizontal movement, and FIG. 10 is an efficiency graph for movement in the vertical direction. It can be seen that the efficiency of the square dot graph, POWER CONTROL) is good.

The vehicle cradle for wireless power transmission as described above is not limited to the configuration and operation method of the embodiments described above. The above embodiments may be configured so that various modifications can be made by selectively combining all or part of each of the embodiments.

10: Vehicle cradle for wireless power transmission
100: support unit
110: support body
130: connection jack
150: first terminal
200: charging unit
210: charging body
230: second terminal
250: adsorption module
270: output module
290: light emitting unit
300: wireless power receiver

Claims (14)

a support unit having a support body having a first connection portion; and
A charging body having a second connection portion rotatably connected to the first connection portion, an adsorption module installed in the charging body, and output a wireless power signal with power input from a power jack of the vehicle and outputting the wireless power signal to the A charging unit having an output module that transmits to a wireless power receiver that is adsorbed and fixed to the adsorption module
including,
The support unit is
a connection jack formed to be connected to the power jack of the vehicle; and
and a first terminal installed in the first connection part and electrically connected to the connection jack,
The charging unit is
It is installed in the second connection portion and further includes a second terminal connected to the first terminal,
The output module is formed to receive the power through the second terminal,
When the charging unit is rotated at various angles with respect to the support unit, because the first connection portion includes a spherical head portion and the first terminal includes a ring terminal formed along the circumference of the maximum cross-sectional area of the head portion, The first terminal installed on the first connection part and the second terminal installed on the second connection part are always in a state of being energized with each other, a vehicle cradle for wireless power transmission. According to claim 1,
The charging body further comprises a housing having a receiving portion,
The output module is built in the receiving unit, a vehicle cradle for wireless power transmission. 3. The method of claim 2,
The adsorption module is
a suction pad disposed to be exposed to the outside of the housing;
a central member passing through the housing and connected to the suction pad; and
The cradle for a vehicle for wireless power transmission, further comprising an operation lever connected to the central member and formed to pull the central member. 4. The method of claim 3,
The charging body,
an opening formed in the housing and communicating with the accommodating part; and
Further comprising an end of the housing forming the opening,
The suction pad is
A vehicle cradle for wireless power transmission, which is disposed on the outside of the opening and spaced apart from the end, and is formed to be in contact with the end when the center member is pulled by the operation lever. 5. The method of claim 4,
The end is
A vehicle cradle for wireless power transmission, which is formed to form a closed loop on one plane. 5. The method of claim 4,
The adsorption module is
The vehicle cradle for wireless power transmission, further comprising an elastic body having both ends fixed to the inner surface of the accommodating part and the suction pad, respectively. 4. The method of claim 3,
The output module is
a transmission coil that oscillates the wireless power signal and has a central hole through which the central member passes; and
A vehicle cradle for wireless power transmission, comprising a transmission control unit for controlling the oscillation of the wireless power signal by the transmission coil. 8. The method of claim 7,
The output module is
The transmission control unit is installed, the cradle for a vehicle for wireless power transmission further comprising a substrate installed on any one of the accommodating unit and the support body. 8. The method of claim 7,
The charging unit is
The vehicle cradle for wireless power transmission, further comprising a light emitting unit displaying a transmission state of the output module under the control of the transmission control unit. According to claim 1,
The support body,
a support module having a support surface supported by the vehicle; and
A vehicle cradle for wireless power transmission, further comprising an extension formed extending from the support module to the first connection part. 11. The method of claim 10,
The support module,
a housing connected to the extension;
a suction pad overlapping the support surface;
a central member passing through the housing and connected to the suction pad; and
The cradle for a vehicle for wireless power transmission, further comprising an operation lever connected to the central member and formed to pull the central member. According to claim 1,
The first connecting portion further comprises a neck portion extending from the head portion and having a cross-sectional area smaller than the maximum cross-sectional area of the head portion,
The second connection part,
a recess portion formed to receive the head portion;
A vehicle cradle for wireless power transmission, which is formed to protrude to surround the recess and includes a side wall portion having a hook portion caught on the neck portion. 13. The method of claim 12,
The first terminal further includes a free terminal formed at a free end of the head part,
The second terminal is
a central terminal formed in the center of the recess and connected to the free terminal; and
Formed along the circumferential direction on the inner circumferential surface of the side wall portion, and comprising an inner peripheral terminal connected to the ring terminal, a cradle for a vehicle for wireless power transmission. 14. The method of claim 13,
The side wall portion includes an outer circumferential thread formed on the outer circumferential surface,
The second connection part,
A cradle for a vehicle for wireless power transmission, further comprising a tightening pipe having a hollow part and having an inner circumferential thread screw-coupled to the outer circumferential thread in the hollow part.

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