KR102166403B1 - Wireless power transmitting cradle for vehicle - Google Patents

Abstract

The present invention provides a support body having a first connection part, a connection jack connected to the support body and formed to be connected to a power jack of a vehicle, and a first terminal installed on the first connection part and electrically connected to the connection jack Having, a support unit; And a charging body having a second connection part rotatably connected to the first connection part, a second terminal installed in the second connection part and connected to the first terminal, and installed to be exposed to the outside of the charging body. A charging unit having an adhesive pad and an output module that outputs a wireless power signal with power input from the connection jack through the second terminal and transmits the wireless power signal to a wireless power receiving device adhesively fixed to the adhesive pad It provides a vehicle cradle for wireless power transmission including a.

Description

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

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

In general, 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 the battery, a separate charging device that provides electric energy to the battery of a portable electronic device using a commercial household power source is required.

Typically, the charging device and the battery have separate contact terminals externally respectively, so that 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 as described above, it is not good in terms of appearance, and the contact terminal is contaminated with external 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 charging method, a wireless power charging system in which power is transmitted wirelessly has been proposed so that the battery is charged in a manner in which the charging device and the contact terminals of the battery do not contact each other.

Such a wireless power charging system may be used while being placed on a desk or a table, but may be used in a vehicle. When used in a vehicle as described above, it is difficult to stably supply electric power to the portable electronic device since it is often necessary to change the arrangement of the portable electronic device. In addition, since a separate structure capable of wireless power charging while being able to easily mount portable electronic devices is not provided inside the vehicle, it is difficult for a user to perform wireless power charging inside the vehicle.

In addition, the vehicle is vibrated during driving due to vibration of the engine or uneven road surface. Such vibration may be transmitted to the vehicle interior, and may be transmitted to a wireless power charging system installed inside the vehicle and a portable electronic device mounted thereto. 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, 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.

An object of the present invention is to provide a vehicle cradle for wireless power transmission, which has a simple structure and is capable of simply and stably fixing and mounting a wireless power receiving device, as well as wireless charging for the mounted wireless power receiving device. will be.

A vehicle cradle for wireless power transmission according to an embodiment of the present invention for realizing the above object includes a support body having a first connection portion, and a connection jack connected to the support body and formed to be connected to a power jack of the vehicle. And, a support unit installed on the first connection unit and having a first terminal electrically connected to the connection jack; And a charging body having a second connection part rotatably connected to the first connection part, a second terminal installed in the second connection part and connected to the first terminal, and installed to be exposed to the outside of the charging body. A charging unit having an adhesive pad and an output module that outputs a wireless power signal with power input from the connection jack through the second terminal and transmits the wireless power signal to a wireless power receiving device adhesively fixed to the adhesive pad It may include.

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 the maximum cross-sectional area portion of the head portion.

Here, the second connection portion may include a recess portion formed to receive the head portion; It is formed to protrude so as to surround the recess, and may include a side wall portion having a hook portion to be hooked to the neck.

Here, the first terminal may include a free terminal formed at a free end of the head; And a ring terminal formed in a ring shape along the circumference of the maximum cross-sectional area of the head.

Here, the second terminal may include a center terminal formed in the center of the recess and connected to the free terminal; And an inner peripheral terminal formed along the circumferential direction on the inner peripheral surface of the sidewall portion and connected to the ring terminal.

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

Here, the adhesive pad may be formed of at least one of a silicone gel and a polyurethane gel.

Here, the charging unit may further include a cover module formed to cover the adhesive pad.

Here, the cover module, the cover; And a hinge rotatably connecting the cover and the charging body to each other.

Here, the cover module includes: a stopper formed to support and fix the cover when the cover is opened and rotated to a position forming the same plane as the adhesive pad; And an auxiliary adhesive pad installed on one surface of the cover facing the adhesive pad.

Here, the output module, a transmission coil built in the charging body and oscillating the wireless power signal; And a transmission control unit 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 installed on one of the support body and the charging body.

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

Here, the output module further includes a temperature sensor installed on the transmission coil, and the transmission control unit stops the oscillation of the wireless power signal when the measured temperature measured by the temperature sensor is lower than a reference temperature. I can.

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

Here, the support module, the housing connected to the extension; An adsorption pad disposed to overlap the support surface; A central member passing through the housing and connected to the adsorption pad; And an operation lever connected to the central member and formed to pull the central member.

Here, the support module may include an opening formed in the housing; 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 end portion It can be formed to be in contact with the part.

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

A vehicle cradle for wireless power transmission according to another embodiment of the present invention for realizing the above-described problems, includes a support unit having a support body having a first connection portion; And a charging body having a second connection part rotatably connected to the first connection part, an adhesive pad installed to be exposed to the outside of the charging body, and a connection formed to be connected to the charging body and connected to the power jack of the vehicle. It may include a charging unit having a jack and an output module that outputs a wireless power signal using power input from the connection jack and transmits the wireless power signal to a wireless power receiver fixed to the adhesive pad.

According to the vehicle cradle for wireless power transmission according to the present invention configured as described above, the wireless power receiver can be mounted only with the configuration of the adhesive pad, so that the structure for mounting is simple and manufacturing is easy. In addition, since the wireless power receiver is fixed with an adhesive pad and an adhesive type, the user can easily attach and detach it and use it, and the fixing power to the wireless power receiver is excellent.

In addition, since the support unit and the charging unit are rotatably connected to each other, it is possible to freely change the arrangement state of the wireless power receiver even when the wireless power receiver is wirelessly charging. This increases the degree of freedom in the arrangement of the wireless power receiver, thereby increasing the convenience of the user's use of the receiver.

In addition, since the main power supply for power supply to the output module is used as the vehicle power during such use, the above power supply is not cut off or unstable. In addition, the length of the cable is shorter than when the wireless power receiver is directly connected to the power jack by wire, so that it is more neat.

Further, since only the adhesive pad may be intervened between the output module and the wireless power receiver, the gap between the two is narrow, and thus charging efficiency for the wireless power receiver can be improved.

1 is a perspective view showing a state in which a wireless power receiver 300 is mounted to 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 a vehicle cradle 10 for wireless power transmission of FIG. 1.
3 is a cross-sectional view of a vehicle cradle 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.
5 is an operation diagram of a vehicle cradle 10 for wireless power transmission according to another embodiment of the present invention.
6 to 11 are graphs showing charging efficiency according to the degree to which the battery cell module 330 of the wireless power receiving apparatus 300 is distant from the vehicle cradle 10 for wireless power transmission of FIGS. 1 and 5.

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/similar reference numerals are assigned to the same/similar configurations even in different embodiments, and the description is replaced with the first description.

1 is a perspective view showing a state in which a wireless power receiver 300 is mounted to 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 structure supported by a 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 in contact with the dashboard D (support module 115, FIG. 2) has a wide 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 power from the vehicle. The 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 transferring the 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 receiver 300. The charging unit 200 may have a rectangular parallelepiped shape as a whole. The main surface of the charging unit 200 becomes a charging surface 210a. The wireless power receiver 300 may be mounted on the charging surface 210a. Specifically, an adhesive pad 240 may be installed on the charging surface 210a, and the wireless power receiving device 300 may be adhered to the adhesive pad 240 to face the charging surface 210a. In this case, the wireless power receiver 300 may be a portable electronic device such as a mobile phone or a music player, and may have various sizes. 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 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 cradle 10 for wireless power transmission of FIG. 1, and FIG. 3 is a cross-sectional view of the vehicle cradle 10 for wireless power transmission of FIG. 1.

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

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 on the other end side opposite to one end where the support module 115 is located among both ends of the extension part 129. The first connection part 111 is a component 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 part 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 portion (a portion where the ring terminal 153 is formed) of the head portion 112.

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, an adsorption pad 121, a central member 123, an operation lever 125, and a spring 127.

The housing 117 is connected to the extension part 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 portion 119 of the housing 117 forming the opening 118 is also formed to form a circular closed loop on one plane.

The adsorption pad 121 is formed of a silicon material and may have a shape of a disk. The adsorption pad 121 has a gap portion 121b formed to be spaced apart from the support surface 121a at a predetermined interval in the central region. Although not shown in the drawing, a reinforcing plate may be further provided on the support surface 121a of the adsorption pad 121 in order to enhance the adsorption force for the vehicle. The reinforcing plate may be formed of a material having a higher coefficient of friction than the adsorption pad 121 and may be formed in a circular ring shape along the circumferential direction of the adsorption pad 121. Such a reinforcing plate may be formed of a compressed hard type sponge material. Sponge is a sponge-like porous material 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 adsorption pad 121.

The operation lever 125 is rotatably connected to the central 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 by the principle of a lever.

The spring 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. When the operation lever 125 is released, the spring 127 pushes the suction pad 121 so that the suction pad 121 is separated from the dashboard D (FIG. 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 part 129 may be determined in consideration of an interval at which the charging unit 200 is to be separated from the dashboard D of the vehicle.

As described above, the connection jack 130 is a component for drawing power from the vehicle. The connection jack 130 is connected to the support module 115 through an 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 an electric 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 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 connector 111.

The charging unit 200 may include a charging body 210, a second terminal 230, an adhesive pad 240, an output module 270, and a light emitting unit 290.

The filling body 210 may have a generally wide rectangular parallelepiped shape. The charging body 210 may include an installation surface 210b opposite to the charging surface 210a. A second connection part 211 is formed on the installation surface 210b. The second connection part 211 is a component that is 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 side wall part 213. The recessed portion 212 is formed by being recessed in a hemispherical shape to accommodate the head portion 112. The side wall portion 213 is formed to protrude from the installation surface 210b so as to surround the recess portion 212. A hook portion 213a may be formed on the inner surface of the sidewall portion 213, and an outer peripheral 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 a pipe shape having a hollow part, and an inner circumferential thread 218 is formed on the inner circumferential surface. A plurality of ribs 219 may be formed on the outer circumferential surface of the tightening pipe 217 at regular intervals.

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 center terminal 231 and an inner peripheral terminal 233. The center terminal 231 is formed in the center of the recess 212. To this end, the central terminal 231 may be a disk-shaped metal. The inner circumferential terminal 233 is formed along the circumferential direction on the inner circumferential 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 connector 211. For example, apart from the mechanical connection of 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 adhesive pad 240 is attached to the charging surface 210a of the charging body 210. Specifically, the adhesive pad 240 is formed to protrude from the charging surface 210a so as to contact the wireless power receiving device 300. In addition, the adhesive pad 240 may be formed to have a uniform thickness, so that the wireless power receiver 300 may be spaced apart from the transmitting coil 271 to be described later at a uniform interval. The adhesive pad 240 may be made of a soft rubber material having adhesiveness. Specifically, the adhesive pad 240 may be formed of a material such as a silicone gel or a polyurethane gel.

The output module 270 is positioned between the charging surface 210a and the installation surface 210b of the charging body 210 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 proceed through the charging surface 210a and the adhesive pad 240. The output module 270 may include a transmission coil 271, a magnetic shield plate 275, a temperature sensor 276, and a substrate 277.

The transmission coil 271 is built in the charging body 210 and is configured to oscillate a wireless power signal. The magnetic shield plate 275 is formed to cover one side of the transmission coil 271. The temperature sensor 276 is disposed in front of the transmitting coil 271 to measure the temperature of the transmitting coil 271. A control circuit such as a transfer control unit 277 is provided 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, when the substrate 277 fails, only the support unit 100 may be replaced so that the charging unit 200 may be used 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. Specifically, the transmission control unit 277 may be configured to stop the oscillation of the wireless power signal when the measured temperature measured by the temperature sensor 276 is lower than the reference temperature, thereby increasing the stability of the system.

The light emitting unit 290 is a component that displays 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 state of charge 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 a 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 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 the drawings, a wireless power charging system according to an embodiment of the present invention includes a vehicle cradle 10 and a wireless power receiving device 300. When the vehicle cradle 10 transmits the wireless power signal to the wireless power receiver 300 by the electromagnetic induction method, the wireless power receiver 300 receiving the power signal charges the battery with the power of the wireless power signal. Alternatively, power is supplied to an electronic device connected to the wireless power receiving device 300.

Hereinafter, an operation relationship between the vehicle cradle 10, 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 side coil 271 refers to the above-described transmission 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 first 2 coil 273] can 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 drive driver 281, and a series resonant converter 282. can do.

The object detection unit 278 detects a change in the load of the primary coil 271 and determines whether the corresponding load change is due to the wireless power receiving device 300 (that is, has a function as an ID confirmation unit), It performs a function of filtering and processing the state of charge signal transmitted from the wireless power receiver 300. For example, when an ID signal, which is a response signal of an ID call signal transmitted through the primary coil 271, is received, it is filtered and processed. During charging, when a charging status signal including information on the battery cell module 330 or charging voltage is received, it filters and processes the received.

The central control unit 279 receives and checks the determination 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 the power signal for the driving driver (281). In addition, when a charging state signal is received from the primary coil 271 to be described later, the driving driver 281 is controlled based on the charge state signal to change the wireless power signal.

The switching control unit 280 controls a switching operation of a 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 a case in which one coil is applied is also included. When one coil is applied, the switching control unit 280 is unnecessary.

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

The series resonant converter 282 generates an 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 performs serial resonance in response to the transmitted power control signal. The operation of the type converter 282 is controlled, and the series resonance type converter 282 applies an output power corresponding to the power value required by the control of the driving driver 281 to the primary coil 271, It is to output the wireless power signal of intensity.

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

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

The wireless power receiver 300 receiving 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 the rectified power It includes a battery cell module 330 to be charged, and a receiving control unit 340 for controlling 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 rectifying unit 320 rectifies the wireless power received from the secondary coil 310 with a DC voltage, and maintains a charged 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 rectifier 320 under the control of the reception control unit 340. Meanwhile, 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 that collects and processes information such as the state of charge of the battery cell.

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

On the other hand, in order to detect the wireless power reception signal transmitted from the wireless power receiver 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 , And an AC voltage sensor may be installed. That is, when a wireless power reception signal (i.e., including an ID signal and a charging state signal) from the wireless power receiving device 300 is received through the primary coil 271, accordingly, the primary coil 271 The current and voltage and the current in the driving driver 281 are fluctuated, and a 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 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 if any of them is a normal signal, the received signal is normally received. The operation is controlled based on. If two or more signals are normal signals, their power levels are measured, the best signal (the signal with the highest power level) is selected, and the best signal is signal-processed to obtain a wireless received signal, Accordingly, wireless power transmission is controlled.

By detecting using the above three sensors, 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, the installation structure of the vehicle cradle 10 for wireless power transmission will be described.

The support unit 100 of the vehicle cradle 10 for wireless power transmission is fixed to the dashboard D of the vehicle through the support module 115. Specifically, since the adsorption pad 121 is spaced apart from the end portion 119 of the housing 117, it can be in close contact with the dashboard D without being disturbed by the end portion 119. At this time, when the user presses the operation lever 125 downward, the central member 123 is pulled toward the operation lever 125, thereby forming a vacuum between the suction pad 121 and the dashboard D. In this case, the end portion 119 of the housing 117 comes into contact with the adsorption pad 121 as described above, and is formed to form a circular closed loop on one plane, so that the adsorption pad 121 It is pressed along the circumferential direction. According to this configuration, since the vacuum space formed between the suction pad 121 and the dashboard D is strongly blocked from the outside, the suction pad 121 can be firmly fixed to the dashboard D.

The charging unit 200 is connected to the support unit 100 as described above. 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 part 213a of the side wall part 213 of the second connection part 211 is caught by the head part 112 (specifically, a part connected to the neck part 113) of the first connection part 111. In this way, while the support unit 100 is coupled to the charging unit 200, the charging unit 200 may be rotated in various directions to adjust the arrangement of the charging unit 200. Thereby, the angle of the wireless power receiver 300 seated on the charging unit 200 can be arranged in one of various arrangement forms according to the body shape 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 desired arrangement of the wireless power receiver 300 will vary for each user. At this time, the wireless power receiver 300 is in a state that is stably coupled to the charging unit 200 by the adhesive pad 240.

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 part 213 so that the side wall part 213 becomes the head part ( 112) can be clamped without flow. It goes without saying that it is possible to adjust the position or angle of the charging unit 200 by loosening the tightening pipe 217 again.

Next, the electrical connection relationship of the vehicle cradle 10 for wireless power transmission and wireless charging for the wireless power receiver 300 through the same 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 rotates 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 energized with each other.

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 charging surface 210a and the adhesive pad 240.

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

5 is an operation diagram of a vehicle cradle 10' for wireless power transmission according to another embodiment of the present invention.

Referring to this drawing, the charging unit 200 may further include a cover module 250 for protecting the adhesive pad 240 from foreign substances.

The cover module 250 may include a cover 251, a hinge 253, a stopper 255, an auxiliary adhesive pad 257, and a spacer 259. The cover 251 is formed to cover the adhesive pad 240. The hinge 253 is installed on the top of the filling body 210. The hinge 253 rotatably connects the cover 251 and the charging body 210 so that the cover 251 is opened upward. The stopper 255 supports the cover 251 to limit the rotation angle of the cover 251. Specifically, the stopper 255 supports and fixes the cover 251 when the cover 251 is opened and rotates to a position forming the same plane as the adhesive pad 240. The auxiliary adhesive pad 257 is installed on one surface of the cover 251 facing the adhesive pad 240. The spaced portion 259 is formed to protrude from the cover 251.

Hereinafter, an operation method of the vehicle cradle 10 for wireless power transmission will be described.

The cover 251 may be folded toward the adhesive pad 240 when the wireless power receiver 300 is not mounted. As a result, dust or foreign matter is not adhered to the adhesive pad 240 so that the adhesiveness of the adhesive pad 240 can be maintained for a long time. In this case, since the auxiliary adhesive pad 257 and the adhesive pad 240 are spaced apart from each other by the spacer 259, they are not adhered to each other, so that the user can easily open the cover 251.

When the cover 251 is opened, the cover 251 is stopped in a state rotated half a turn by the stopper 255. In this case, the auxiliary adhesive pad 257 and the adhesive pad 240 are disposed on the same plane. According to this configuration, the area that can be adhered to the wireless power receiver 300 is widened, so that the wireless power receiver 300 having a large size such as a smartphone or tablet having a large screen can be more stably fixed.

Hereinafter, a charging method according to a change in the mounting position of the wireless power receiver 300 for the vehicle cradles 10 and 10 ′ for wireless power transmission will be described with reference to FIGS. 6 to 11.

6 to 11 show charging efficiency according to the degree to which the battery cell module 330 of the wireless power receiving device 300 is distant from the vehicle cradles 10 and 10 ′ for wireless power transmission of FIGS. 1 and 5. It is a graph.

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, specifically, the battery cell module 330 moves [The change from the setting position according to the size difference of the wireless power receiving apparatus 300 is also included], so that the power transmitted to the battery cell module 330 may be lower than the reference value. At this time, the wireless power receiving device 300 transmits a signal to the output module 270 to reinforce and transmit the signal. For example, assuming that the reference voltage is 5V and the reference deviation value is 0.5V, when the battery cell module 330 moves and receives a voltage lower than 4.5V, the reception control unit 340 is boosted by about 0.5V and transmitted. Control the transmission signal at, and in response to this, the output module 270 increases the transmission power of the primary coil 271 so that it is boosted and received by 0.5V, so that the enhanced inductive magnetic field is transmitted, and the output from the output module 270 As an example of a method of increasing the generated transmission power, the oscillation frequency is changed.

As the transmission power transmitted from the output module 270 is configured to change as described above, charging efficiency for a distance change of the battery cell module 330 from the output module 270 is illustrated in FIGS. 6 to 11. That is, FIGS. 6 to 9 show the case of the secondary side reference power of the battery cell module 330 at about 2.5W, and the output module 270 while moving between -7 mm to 7 mm in the horizontal direction and the vertical direction, respectively. It shows the primary-side power (W) in, and the secondary-side power (W) and efficiency (%) in the battery cell module 330. Here, the efficiency (%) is the efficiency for 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 power / primary power) * 100) It is represented by

In addition, the transmission power compensation according to the present embodiment was adjusted to be 0.5W. Accordingly, in FIGS. 6 and 8, the secondary side power of the battery cell module 330 shows a graph between 2 and 2.5 W, and the output Regarding the change in the horizontal distance and the vertical distance between the module 270 and the battery cell module 330, the charging efficiency when the output module 270 is charged without changing the frequency is shown. 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 power of the secondary side of the battery cell module 330 decreases as it moves away from the center, thereby decreasing the efficiency.

Accordingly, in FIGS. 7 and 9 compared with FIGS. 6 and 8, as the battery cell module 330 is moved horizontally and vertically from the charging surface 210a of the vehicle cradle 10, the battery cell module 330 It can be seen that power is stably transmitted by controlling the power by changing the frequency in the output module 270 by receiving the information on the change in the received power at, and thereby power transmission efficiency is also in a good state.

And FIG. 10 is an efficiency graph for horizontal movement, and FIG. 11 is an efficiency graph for vertical movement. When there is no frequency (lower curve graph, FIXED POWER), when the frequency is changed (upper 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 all or a part of each of the embodiments may be selectively combined and various modifications may be made.

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
240: adhesive pad
250: cover module
270: output module
290: light emitting unit
300: wireless power receiver

Claims (19)

A support body having a first connection part, a connection jack connected to the support body and formed to be connected to a power jack of a vehicle, and a first terminal installed on the first connection part and electrically connected to the connection jack, a support unit; And
A charging body having a second connection part rotatably connected to the first connection part, a second terminal installed in the second connection part and connected to the first terminal, and an adhesive installed to be exposed to the outside of the charging body A charging unit having a pad and an output module that outputs a wireless power signal with power input from the connection jack through the second terminal and transmits the wireless power signal to a wireless power receiving device adhesively fixed to the adhesive pad. Including,
The first connection part,
Spherical head; And
And a neck portion extending from the head portion and having a cross-sectional area smaller than the maximum cross-sectional area portion of the head portion,
The second connection part,
A recess portion formed to receive the head portion; And
It is formed to protrude to surround the recessed portion, and includes a side wall portion having a hook portion to be hooked to the neck,
The first terminal,
A free terminal formed at the free end of the head; And
A vehicle cradle for wireless power transmission, comprising a ring terminal formed in a ring shape along the circumference of the maximum cross-sectional area of the head.
delete delete delete The method of claim 1,
The second terminal,
A central terminal formed in the center of the recess and connected to the free terminal; And
A vehicle cradle for wireless power transmission, which is formed along an inner circumferential surface of the side wall portion and includes an inner circumferential terminal connected to the ring terminal. The method of claim 5,
The side wall portion includes an outer peripheral thread formed on the outer peripheral surface,
The second connection part,
A vehicle cradle for wireless power transmission having a hollow part, and further comprising a tightening pipe having an inner circumferential thread screwed to the outer circumferential thread in the hollow part.
The method of claim 1,
The adhesive pad,
A vehicle cradle for wireless power transmission, which is formed of at least one of silicon gel and polyurethane gel.
The method of claim 1,
The charging unit,
A vehicle cradle for wireless power transmission, further comprising a cover module formed to cover the adhesive pad.

The method of claim 8,
The cover module,
cover; And
A vehicle cradle for wireless power transmission, comprising a hinge for rotatably connecting the cover and the charging body to each other.
The method of claim 9,
The cover module,
A stopper formed to support and fix the cover when the cover is opened and rotated to a position forming the same plane as the adhesive pad; And
A vehicle cradle for wireless power transmission, further comprising an auxiliary adhesive pad installed on one surface of the cover facing the adhesive pad.
The method of claim 1,
The output module,
A transmission coil built into the charging body and oscillating the wireless power signal; And
A vehicle cradle for wireless power transmission comprising a transmission control unit for controlling oscillation of the wireless power signal by the transmission coil.
The method of claim 11,
The output module,
The transmission control unit is installed, further comprising a substrate installed on any one of the support body and the charging body, a vehicle cradle for wireless power transmission.
The method of claim 11,
The charging unit,
A vehicle cradle for wireless power transmission, further comprising a light emitting unit for displaying a transmission state of the output module under the control of the transmission control unit.
The method of claim 11,
The output module,
Further comprising a temperature sensor installed on the transmission coil,
The transmission control unit,
When the actual temperature measured by the temperature sensor is lower than the reference temperature, stopping the oscillation of the wireless power signal, a vehicle cradle for wireless power transmission.
The method of 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 part extending from the support module to the first connection part.
The method of claim 15,
The support module,
A housing connected to the extension part;
An adsorption pad disposed to overlap the support surface;
A central member passing through the housing and connected to the adsorption pad; And
A vehicle cradle for wireless power transmission, further comprising an operation lever connected to the central member and formed to pull the central member.
The method of claim 16,
The support module,
An opening formed in the housing; And
Further comprising an end portion of the housing forming the opening,
The adsorption pad,
A vehicle cradle for wireless power transmission, which is disposed outside the opening to be spaced apart from the end portion, and formed to contact the end portion when the central member is pulled by the operation lever.
The method of claim 17,
The end portion,
A vehicle cradle for wireless power transmission, which is formed to form a closed loop on one plane.
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