KR102627403B1 - Wireless power transmitting cradle for vehicle - Google Patents

Abstract

The present invention includes: a support unit having a support body with a first connection portion; And a charging body having a second connection part rotatably connected to the first connection part, an adsorption module installed in the charging body, and outputting a wireless power signal with power input from the power jack of the vehicle and generating the wireless power signal. Provided is a vehicle holder for wireless power transmission, including a charging unit having an output module for transmitting to a wireless power receiving device adsorbed and fixed to the adsorption module.

Description

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

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

Generally, portable electronic devices such as mobile communication terminals and PDAs (Personal Digital Assistants) are equipped with rechargeable secondary batteries as batteries. In order to charge a battery, a separate charging device is needed that provides electrical energy to the battery of a portable electronic device using a household commercial power source.

Typically, the charging device and the battery each have separate external contact terminals, and the charging device and the battery are electrically connected by connecting the two contact terminals to each other. However, if the contact terminal protrudes to the outside like this, it does not look good and the contact condition can easily become poor due to contamination of the contact terminal by external foreign substances. Additionally, if the battery is short-circuited or exposed to moisture due to the user's carelessness, the charging energy can be easily lost.

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

This wireless power charging system can typically be used on a desk or table, but can also be used in a vehicle. In relation to this, the interior of the current vehicle is not provided with a separate structure that can easily mount a wireless power receiving device such as a portable electronic device while enabling wireless power charging. Accordingly, it is not easy for users to wirelessly charge their portable electronic devices. In addition, when trying to watch a video, etc. through the display of a portable electronic device mounted inside a vehicle, it is necessary to change the output direction of the display depending on the direction the seated person is looking. In this case, the portable electronic device for the wireless power charging system Due to changes in the arrangement, it is difficult to supply wireless power stably.

In addition, the vehicle generates vibration while driving due to engine vibration or road surface irregularities. These vibrations can be transmitted inside the vehicle, to the wireless power charging system installed inside the vehicle, and to portable electronic devices mounted thereon. In this case, the portable electronic device may not be properly positioned in the wireless power charging system due to the vibration of the vehicle, which may reduce charging efficiency. Accordingly, a wireless power charging system installed in a vehicle needs to be configured to stably secure portable electronic devices even when vibration occurs.

The purpose of the present invention is to allow the arrangement of the wireless power receiving device being charged to be freely changed while performing wireless charging for the wireless power receiving device, and to easily and stably fix and mount the wireless power receiving device. The purpose is to provide a vehicle holder for wireless power transmission.

A vehicle holder for wireless power transmission related to an embodiment of the present invention for realizing the above problem includes a support unit having a support body including a first connection portion; And a charging body having a second connection part rotatably connected to the first connection part, an adsorption module installed in the charging body, and outputting a wireless power signal with power input from the power jack of the vehicle and generating the wireless power signal. It may include a charging unit having an output module that transmits to a wireless power receiving device adsorbed and fixed to the adsorption module.

Here, the support unit includes a connection jack formed to be connected to the 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 further includes a housing having a receiving portion, and the output module may be built into the receiving portion.

Here, the adsorption module includes: an adsorption pad disposed to be exposed to the outside of the housing; a central member that penetrates the housing and is connected to the suction pad; And it may further include an operating lever connected to the central member and configured to pull the central member.

Here, the charging body includes an opening formed in the housing and communicating with the receiving portion; and an end portion of the housing forming the opening, wherein the suction pad is disposed outside the opening and spaced apart from the end portion, and when the central member is pulled by the operation lever, the suction pad is disposed outside the opening portion and is spaced apart from the end portion. It can be formed to come into contact with wealth.

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

Here, the suction module may further include an elastic body whose both ends are respectively fixed to the inner surface of the receiving portion and the suction pad.

Here, the output module includes a transmission coil that oscillates the wireless power signal and has a central hole through which the central member passes; And it may include a transmission control unit that controls 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 accommodation unit and the support body.

Here, the charging unit may further include a light emitting unit that displays the transmission status of the output module under the control of the transmission control unit.

Here, the support body includes a support module having a support surface supported by the vehicle; And it may further include an extension part extending from the support module to the first connection part.

Here, the support module includes a housing connected to the extension part; a suction pad disposed to overlap the support surface; a central member that penetrates the housing and is connected to the suction pad; And it may further include an operating lever connected to the central member and configured to pull the central member.

Here, the first connection part includes a spherical head part; and 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, wherein the second connection portion includes a recess portion formed to receive the head portion; It may include a side wall portion that protrudes to surround the recess portion and includes a hook portion that hangs on the neck portion.

Here, the first terminal includes: a free terminal formed at a free end of the head portion; 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 includes a central terminal formed at the center of the recess portion and connected to the free terminal. And it may include 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 a peripheral thread formed on an outer peripheral surface, and the second connection portion may further include a tightening pipe having a hollow portion and an inner peripheral thread screwed to the outer peripheral thread. there is.

According to the vehicle holder for wireless power transmission related to the present invention configured as described above, the support unit and the charging unit are rotatably connected to each other, so that the arrangement state of the wireless power receiving device is maintained even when the wireless power receiving device is being wirelessly charged. You can change it freely. This increases the degree of freedom regarding the arrangement of the wireless power receiving device, thereby increasing the user's convenience in using the receiving device.

In addition, since the wireless power receiving device is adsorbed and fixed by the adsorption module, not only is the fixing force excellent and it is easy to mount, but there are also relatively few restrictions on the size of the wireless power receiving device that can be mounted.

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

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

Figure 1 is a perspective view showing a state in which a wireless power receiving device 300 is mounted on the charging unit 200 of a vehicle holder 10 for wireless power transmission according to an embodiment of the present invention.

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

The support unit 100 is 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 so that the part in contact with the dashboard D (support module 115, Figure 2) has a large cross-sectional area and the part connected to the charging unit 200 has a relatively narrow cross-sectional area. . The connection jack 130 is connected to the vehicle's power jack (P) and becomes a medium through which the vehicle's power is input. The wire 131 connected to the connection jack 130 extends into the support body 110. Alternatively, the 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 outputs a wireless power signal for charging the wireless power receiving device 300. The charging unit 200 may have an overall rectangular parallelepiped shape. A wireless power receiving device 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 receiving device 300 may be adsorbed and fixed to the adsorption module 250. At this time, the wireless power receiving device 300 may be a portable electronic device such as a mobile phone or music player, and its size may vary. The configuration for wireless charging of this wireless power receiving device 300 will be described later with reference to FIG. 4.

The above support unit 100 and 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 in FIG. 1 , and FIG. 3 is a cross-sectional view of the vehicle holder 10 for wireless power transmission in FIG. 1 .

Referring to these 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 of the extension part 129, which is opposite to one end where the support module 115 is located. The first connection portion 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 portion 112 may have a spherical shape. The neck portion 113 is a portion that connects the head portion 112 to the extension portion 129 and is formed to have a smaller cross-sectional area 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 largest cross-sectional area among the support bodies 110. As shown in FIG. 3, the support module 115 may have a support surface 121a, which is a flat surface in contact with the vehicle. The support module 115 may include a housing 117, a suction pad 121, a central member 123, an operating lever 125, and an elastic body 127.

The housing 117 is connected to the extension portion 129 and is formed overall in a hemispherical shape. An opening 118 is formed at the bottom of the housing 117. Since this 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 made of silicone material and may have the shape of a disk. The suction pad 121 has a gap portion 121b spaced apart from the support surface 121a at a predetermined distance in the central region. Although not shown in the drawing, a reinforcing plate may be further provided on the support surface 121a of the suction pad 121 to enhance the suction power to the vehicle. The reinforcement plate may be formed of a material with 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. This reinforcement plate may be formed of a compressed hard type sponge material. A sponge is an elastic spongy porous material and is mainly made of synthetic resin.

The central member 123 penetrates the housing 117 and is connected to the central area of the suction pad 121.

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

The elastic body 127 is formed to surround the central member 123, and both ends thereof are supported on 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, Figure 1).

The extension part 129 is a part extending from the support module 115 to the first connection part 111. The length of the extension portion 129 may be determined by considering the distance between the charging unit 200 and the dashboard D of the vehicle.

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

The first terminal 150 is installed in the first connection portion 111. The first terminal 150 is electrically connected to the connection jack 130 through a wire 131. The first terminal 150 is for transmitting power input from the connection jack 130 to the charging unit 200. 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 portion 112. The free terminal 151 may be a disk-shaped metal. In comparison, the ring terminal 153 may be installed along the perimeter of the maximum cross-sectional area of the head portion 112. The ring terminal 153 may be made of ring-shaped metal. Unlike the above, the first terminal 150 may be installed in a configuration other than the first connection portion 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 that communicates with the receiving portion 211. Since this 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 portion 211 to support the output module 270. Additionally, the charging body 210 may include an installation surface 210a in which the second connection portion 211 is eccentrically formed. The second connection portion 211 is mechanically coupled to the first connection portion 111 of the support unit 100. To this end, the second connection portion 211 may include a recess portion 212 and a side wall portion 213. The recess portion 212 is formed to be recessed in a hemispherical shape to accommodate the head portion 112. The side wall portion 213 protrudes 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 a peripheral screw thread 213b may be formed on the outer surface. The second connection portion 211 may further include a tightening pipe 217. The tightening pipe 217 is in the form of a pipe with a hollow portion, and an inner peripheral thread 218 is formed on the inner peripheral surface. A plurality of ribs 219 may be formed on the outer peripheral surface of the tightening pipe 217 at regular intervals.

The second terminal 230 is 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 terminal 233. The central terminal 231 is formed in the center of the recess portion 212. For this purpose, the central terminal 231 may be a disc-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 made of metal forming an overall ring shape. Alternatively, the second terminal 230 may be installed in a configuration other than the second connection portion 211. For example, apart from the mechanical connection between the first connection part 111 and the second connection part 211, the second terminal 230 may be directly electrically connected to the first terminal 150.

The adsorption module 250 is configured to fix the wireless power receiving device 300. The adsorption module 250 may include an adsorption pad 251, a central member 253, an operating lever 255, and an elastic body 257. Each of these configurations may be similar to the suction pad 121, the central member 123, the operating 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 that is adsorbed to the wireless power receiver 300, and a gap portion 251b formed on the adsorption surface 251a. The central member 253 penetrates the housing 213 and is connected to the central area of the suction pad 251. The operating lever 255 is rotatably connected to the central member 253 and is supported on the outer surface of the housing 213 to pull the central member 253 using the principle of a lever. The elastic body 257 is formed to surround the central member 253, and both ends thereof are supported on the inner surface of the receiving portion 211 and the suction pad 251, respectively. When the control lever 255 is released, the elastic body 257 pushes the suction pad 251 so that the suction pad 251 is separated from the wireless power receiver 300.

The output module 270 is built into the receiving portion 211 and outputs 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 pass through the suction pad 251. The output module 270 may include a transmitting coil 271, a magnetic shielding plate 275, and a substrate 277.

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

The magnetic shield plate 275 is formed to cover one side of the transmitting coil 271. A control circuit such as a transmission control unit 277 is installed on the board 277. The substrate 277 may be installed on the rear side of the magnetic shield plate 275. Alternatively, the board 277 may be installed on the support body 110, and in this case, if the board 277 fails, only the support unit 100 can be replaced and the charging unit 200 can be used as 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 status of the output module 270 under the control of the transmission control unit 277. The light emitting unit 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 point 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 corresponding to the charging unit 200. ) will be described with reference to Figure 4.

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

Referring to this drawing, a wireless power charging system related to an embodiment of the present invention includes a vehicle holder 10 for wireless power transmission and a wireless power receiving device 300. By the electromagnetic induction method, when the vehicle holder 10 for wireless power transmission transmits a wireless power signal to the wireless power receiving device 300, the wireless power receiving device 300 that receives this power signal receives the wireless power signal. The battery is charged with power or power is supplied to electronic devices connected to the wireless power receiver 300.

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

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

The primary coil 271 refers to the transmission coil 271 described above. The primary coil 271 transmits a power signal to the secondary coil 310 of the wireless power receiver 300 by electromagnetic induction, and in this embodiment, two coils (i.e., the first coil 272 and the second coil 271) transmit the power signal to the secondary coil 310 of the wireless power receiver 300. 2 coil 273] may be applied.

The transmission control unit 277, which controls the primary 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 resonance converter 282. can do.

The object detection unit 278 not only detects the load change of the primary coil 271 and determines whether the load change is caused by the wireless power receiver 300 (i.e., 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 receiving device 300. For example, when an ID signal, which is a response signal to an ID call signal transmitted through the primary coil 271, is received, it is filtered and processed. During charging, when a charge state signal containing information about the battery cell module 330 or the charging voltage is received, it filters and processes the signal.

The central control unit 279 receives and confirms the decision result of the object detection unit 278, analyzes the ID signal received from the primary coil 271, and outputs a wireless power signal through the primary coil 271. It serves to transmit a power signal to the driving driver 281. In addition, when a charging state signal is received from the primary coil 271, which will be described later, the wireless power signal is changed by controlling the driving driver 281 based on it.

The switching control unit 280 controls the switching operation of the switch between the series resonance 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 to this and also includes cases where one coil is applied. If one coil is applied, the switching control unit 280 becomes unnecessary.

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

The series resonance converter 282 generates output power to generate 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 output of a power signal with a required power value to the drive driver 281, the drive driver 281 performs series resonance in response to the transmitted power control signal. Controls the operation of the converter 282, and the series resonance converter 282 applies output power corresponding to the power value required by the control of the drive driver 281 to the primary coil 271, This is to ensure that a high-intensity wireless power signal is output.

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

The AC/DC converter 283 is a device that changes alternating current power of 220V or 110V into direct current power of a predetermined voltage. As described above, the output voltage value is changed under the control of the central control unit 279.

The wireless power receiver 300, which receives power by receiving a 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 a rectified power It includes a battery cell module 330 that is charged, and a receiving control unit 340 that controls the secondary coil 310, the rectifier 320, and the battery cell module 330.

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

The rectifier 320 rectifies the wireless power received from the secondary coil 310 into a direct current voltage, and maintains the charging state at the charging voltage until charging begins.

The battery cell module 330 is subject to charging through direct current power from the rectifier 320 under the control of the reception control unit 340. Meanwhile, the battery cell module 330 includes protection circuits such as overvoltage and overcurrent prevention circuits and temperature detection circuits, and also includes a charging management module that collects and processes information such as the charging state of the battery cell.

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

Meanwhile, for detection of the wireless power reception signal transmitted from the wireless power reception device 300, for example, three sensors may be installed. Although not shown in the drawing, according to an embodiment of the present invention, a direct current sensor for measuring the direct current of the driving driver 281 and an alternating current sensor for measuring the alternating current and alternating voltage of the primary coil 271. , and alternating voltage sensors may be installed. That is, when a wireless power reception signal (i.e., including an ID signal and a charging status signal) is received from the wireless power receiving device 300 through the primary coil 271, the The current and voltage and the current in the driving driver 281 change, and by detecting this, a wireless power reception signal is received. In the present invention, it is possible to receive a more accurate wireless power reception signal by using three sensors. That is, the central control unit 279 generates an error signal only when signals from the AC current sensor, DC current sensor, and AC voltage sensor are all errors, and when any one of them is a normal signal, the normally received signal The operation is controlled based on this. 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 above three sensors, the reliability of power control can be increased even if the wireless power receiving device 300 changes position during charging.

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

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

The charging unit of the vehicle holder 10 for wireless power transmission is adsorbed to the wireless power receiving device 300 through the adsorption module 250. Specifically, the suction pad 251 is spaced apart from the end 217 of the housing 213, so it can be in close contact with the outer surface of the wireless power receiver 300 without being disturbed by the end 217. At this time, when the user raises the operating lever 255, the central material 253 is pulled toward the operating lever 255, and thereby a vacuum is formed between the suction pad 251 and the outer surface of the wireless power receiving device 300. do. In this case, the end portion 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 the suction pad 251. Pressure is applied along the circumferential direction. According to this configuration, the vacuum space formed between the suction pad 251 and the wireless power receiving device 300 is strongly blocked from the outside, so the wireless power receiving device 300 can be firmly fixed to the suction pad 251. You can.

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

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 portion 112 of the first connection portion 111 is received into the recess portion 212 of the second connection portion 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 state where the support unit 100 is coupled to the charging unit 200, the charging unit 200 can be rotated in various directions to adjust the arrangement of the charging unit 200. As a result, the angle of the wireless power receiving device 300 mounted on the charging unit 200 can be arranged in one of various configurations according to the body shape or preference of the vehicle user (driver or passenger). For example, if the wireless power receiving device 300 is a mobile phone and an image is viewed through its display, the arrangement of the wireless power receiving device 300 desired by each user will vary. At this time, the wireless power receiving device 300 is stably coupled to the charging unit 200 by the adsorption module 250.

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

Next, the electrical connection relationship of the vehicle holder 10 for wireless power transmission and wireless charging of the wireless power receiving device 300 through it will be described.

The connection jack 130 is connected to the vehicle's power jack (P) and receives 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 if the charging unit 200 is rotated at various angles with respect to the support unit 100, the first terminal 150 installed on the first connection part 111 and the second terminal installed on the second connection part 211 ( 130) are always in a state of conducting electricity to 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 the direction that passes through the suction pad 251.

The wireless power receiving device 300, which receives the wireless power signal, charges the battery cell module 330, as described with reference to FIG. 4.

Hereinafter, a charging method according to changes in the mounting position of the wireless power receiving device 300 on the vehicle holder 10 for wireless power transmission will be described with reference to FIGS. 5 to 10.

FIGS. 5 to 10 are graphs showing charging efficiency according to the distance of the battery cell module 330 of the wireless power receiving device 300 from the vehicle holder 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, specifically the battery cell module 330, on the vehicle holder 10 for wireless power transmission. ) may move its position (including a change from the set position due to a difference in the size of the wireless power receiving device 300), so that the power transmitted to the battery cell module 330 may be lower than the standard value. At this time, the wireless power receiving device 300 transmits a signal to the output module 270 to reinforce it and transmit it. For example, assuming that the reference voltage is 5V and the reference deviation value is 0.5V, if a voltage lower than 4.5V is received due to movement of the battery cell module 330, the reception control unit 340 is boosted by about 0.5V and transmitted. Controls the transmission signal, and in response to this, the output module 270 increases the transmission power of the primary coil 271 so that it is boosted by 0.5V and received, so that the enhanced induced magnetic field is transmitted, and the output from the output module 270 An example of a method of increasing the transmission power is to change the oscillation frequency.

As the transmission power transmitted from the output module 270 is configured to change in this way, 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, Figures 5 to 8 show the secondary side reference power of the battery cell module 330 at about 2.5W, and the output module 270 is moved between -7 mm and 7 mm in the horizontal direction and the vertical direction up and down, respectively. It shows the primary side power (W), the secondary side power (W) and efficiency (%) in the battery cell module 330. Here, efficiency (%) is the efficiency of the output power applied to the secondary side of the battery cell module 330 with respect to the primary input power of the output module 270 ((secondary side power / primary side power) * 100) It is expressed as .

And the transmission power compensation according to this embodiment was adjusted to 0.5W. As a result, Figures 5 and 7 show a graph in which the secondary power of the battery cell module 330 is between 2 and 2.5 W, and the output Charging efficiency is shown when charging is performed without changing the frequency of the output module 270 with respect to changes in the horizontal and vertical distances between the module 270 and the battery cell module 330. That is, when the battery cell module 330 is moved horizontally or vertically 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, lowering efficiency.

Accordingly, in FIGS. 6 and 8 compared with FIGS. 5 and 7, as the battery cell module 330 is moved in the horizontal and vertical directions, respectively, from the suction pad 251 of the vehicle holder 10 for wireless power transmission, the battery By receiving information on changes in received power from the cell module 330 and controlling the power by changing the frequency at the output module 270, stable power transmission is shown, and it can be seen that power transmission efficiency is also good. there is.

And FIG. 9 is an efficiency graph for horizontal movement, and FIG. 10 is an efficiency graph for vertical movement. The case where the frequency is changed (the upper curved graph, FIXED POWER) is better than when there is no frequency (the lower curved graph, FIXED POWER). It can be seen that the efficiency of the square dot graph (POWER CONTROL) is good.

The vehicle holder 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 embodiment.

10: Vehicle holder 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 receiving device

Claims (14)

a support unit having a support body with a first connection; and
Charging unit having a charging body with a second connection and an output module
Including,
The support unit is,
Further comprising a first terminal installed in the first connection portion and electrically connected to the vehicle,
The charging unit is,
It is installed in the second connection part and further includes a second terminal connected to the first terminal,
A vehicle holder for wireless power transmission, wherein the first connection portion includes a spherical head portion and the first terminal includes a ring terminal formed along a circumference of the maximum cross-sectional area of the head portion. According to paragraph 1,
The charging body further includes a housing having a receiving portion,
The output module is a vehicle holder for wireless power transmission, which is built into the receiving part. According to paragraph 2,
The charging unit further includes an adsorption module,
The adsorption module is,
a suction pad disposed to be exposed to the outside of the housing;
a central member that penetrates the housing and is connected to the suction pad; and
A vehicle holder for wireless power transmission, including a control lever connected to the central member and configured to pull the central member. According to paragraph 3,
The charging body is,
an opening formed in the housing and communicating with the receiving portion; and
Further comprising an end portion of the housing forming the opening,
The suction pad is,
A vehicle holder for wireless power transmission that is disposed outside the opening and spaced apart from the end portion, and is formed to contact the end portion when the central member is pulled by the operation lever. According to paragraph 4,
The end portion is
A vehicle holder for wireless power transmission that is formed to form a closed loop on one plane. According to paragraph 4,
The adsorption module is,
A vehicle holder for wireless power transmission, further comprising an elastic body fixed at both ends to the inner surface of the receiving portion and the suction pad. According to paragraph 3,
The output module is,
A transmission coil that oscillates a wireless power signal and has a central hole through which the central member passes; and
A vehicle holder for wireless power transmission, including a transmission control unit that controls oscillation of the wireless power signal by the transmission coil. In clause 7,
The output module is,
A vehicle holder for wireless power transmission, wherein the transmission control unit is installed and further includes a substrate installed on any one of the receiving unit and the support body. In clause 7,
The charging unit is,
A vehicle holder for wireless power transmission, further comprising a light emitting unit that displays the transmission status of the output module under the control of the transmission control unit. According to paragraph 1,
The support body is,
a support module having a support surface supported on the vehicle; and
A vehicle holder for wireless power transmission, further comprising an extension part extending from the support module to the first connection part. According to clause 10,
The support module is,
a housing connected to the extension part;
a suction pad disposed to overlap the support surface;
a central member that penetrates the housing and is connected to the suction pad; and
A vehicle holder for wireless power transmission, further comprising an operation lever connected to the central member and configured to pull the central member. According to paragraph 1,
The first connection portion further includes 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 is,
a recess formed to accommodate the head portion; and
A vehicle holder for wireless power transmission, including a side wall portion that protrudes to surround the recess portion and includes a hook portion that hangs on the neck portion. According to clause 12,
The first terminal further includes a free terminal formed at a free end of the head portion,
The second terminal is,
a central terminal formed at the center of the recess and connected to the free terminal; and
A vehicle holder for wireless power transmission, which is formed along the circumferential direction on the inner peripheral surface of the side wall portion and includes an inner peripheral terminal connected to the ring terminal. According to clause 13,
The side wall portion includes peripheral threads formed on the outer peripheral surface,
The second connection part is,
A vehicle holder for wireless power transmission, further comprising a tightening tube having a hollow portion and having an inner peripheral thread screwed to the outer peripheral thread in the hollow portion.