KR20210010590A - Wireless power transmitting apparatus for vehicle - Google Patents

Abstract

Provided is a wireless power transmission device for a vehicle capable of improving a charging efficiency of a wireless power reception device. The wireless power transmission device for the vehicle comprises: a support unit having a support body installed in a vehicle; a charging unit having a charging body connected to the support body, an adhesive pad installed to be exposed to the outside of the charging body, and an output module outputting a wireless power signal with power inputted from a power jack of the vehicle and transmitting the wireless power signal to a wireless power reception device adhesively fixed to the adhesive pad; and a holding unit installed on the charging body and formed so as to support the wireless power reception device placed on the adhesive pad.

Description

Vehicle wireless power transmission device {WIRELESS POWER TRANSMITTING APPARATUS FOR VEHICLE}

The present invention relates to a wireless power transmission device used in a vehicle.

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. Such a charging device usually has an output terminal, so that when the battery is charged, it comes into direct contact with its input terminal. However, when the contact terminals are exposed to the outside as described above, the contact terminal is contaminated with an external foreign substance, so that the contact state is easily defective, and it is not good in terms of aesthetics.

Accordingly, 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.

On the other hand, in recent years, due to an increase in the use of navigation using a smartphone or the like, demand for charging portable electronic devices in a vehicle is increasing. However, unlike this increase in demand, a separate vehicle structure capable of charging wirelessly by simply mounting portable electronic devices has not been commercially available until now.

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. Due to this, the portable electronic device may be separated from the wireless power charging system and fall onto the interior floor of the vehicle. In this case, when the portable electronic device is rolled into the brake pedal, it may cause an inoperable state of the brake, resulting in a serious danger situation for the driver.

In addition, the portable electronic device may not be properly positioned in the wireless power charging system due to the vibration of the vehicle, and thus its charging efficiency may be degraded. Accordingly, the wireless power charging system installed in the vehicle needs to be configured to be able to firmly hold the portable electronic device even when vibration occurs.

An object of the present invention is to provide a wireless power transmission device for a vehicle, which not only enables wireless charging of the wireless power receiver in a vehicle, but also can easily mount the wireless power receiver and stably support the wireless power receiver.

A wireless power transmission device for a vehicle according to an embodiment of the present invention for realizing the above object includes a support unit having a support body installed in the vehicle; A charging body connected to the support body, an adhesive pad installed to be exposed to the outside of the charging body, and outputting a wireless power signal with power input from a power jack of the vehicle, and attaching and fixing the wireless power signal to the adhesive pad A charging unit having an output module for transmitting to the wireless power receiver; And a holding unit installed on the charging body and formed to support the wireless power receiving device placed on the adhesive pad.

Here, the holding unit may include a clamping member protruding from a side portion of the charging body to support the wireless power receiver.

Here, the clamping member may include: a first inclined portion formed to be inclined from a side portion of the filling body toward a central axis of the filling body and made of a material having elasticity; And a second inclined portion extending from the first inclined portion and formed to be inclined in a direction away from the central axis of the charging body.

Here, the holding unit may further include a sliding member extending from the clamping member and formed to be retracted and retracted from the side of the filling body.

Here, the sliding member is installed on both sides of the filling body, and the holding unit includes: a rack gear formed on each of the sliding members along a length direction thereof; And a pinion gear rotatably installed on the charging body and formed to engage with the rack gear, respectively.

Here, the holding unit may further include an elastic body that is fixed to both ends of the sliding member and the charging body, respectively, to return the sliding member toward the charging body.

Here, the holding unit may include a support member protruding from a lower portion of the charging body to support the wireless power receiver.

Here, the support member, a guide hole formed in the lower portion of the filling body; A guide part slidably installed with respect to the guide hole; And a pedestal formed bent in the guide part to support the wireless power receiver.

Here, the support member includes: a locking protrusion formed on an inner wall of the guide hole; And a plurality of locking grooves formed on the outer surface of the guide part along the length direction thereof, and formed to be caught with the locking projections when the guide part slides.

Here, the support unit may include a first connection part formed on the support body, and the charging unit may include a second connection part installed on the charging body and rotatably connected to the first connection part. .

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

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

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 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.

According to the wireless power transmission device for a vehicle according to the present invention configured as described above, the wireless power reception device is mounted by an adhesive pad, so that mounting and detachment of the wireless power reception device is simple, and the structure for mounting is simple. And easy to manufacture.

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.

In addition, according to the configuration of the holding unit, it is possible to more firmly hold the wireless power receiving device, and thus, it is possible to prevent a situation in which the wireless power receiving device falls to the floor of the vehicle and makes it difficult to operate the brake pedal even when vibration of the vehicle occurs. In addition, since the holding unit is configured to have a variable width by the sliding member, it is possible to stably fix the wireless power receiver of various sizes.

1 is a perspective view illustrating a state in which a wireless power receiver 400 is mounted to a charging unit 200 of a wireless power transmitter 10 for a vehicle according to an embodiment of the present invention.
2 is an exploded perspective view of the vehicle wireless power transmission device 10 of FIG. 1.
3 is a cross-sectional view of the vehicle wireless power transmission device 10 of FIG. 1.
4 is an operation diagram of the holding unit 300 of the wireless power transmission device 10 for a vehicle of FIG. 1.
5 is an operation diagram of the holding unit 300 of the wireless power transmission device 10 for a vehicle of FIG. 1.
FIG. 6 is a block diagram illustrating wireless charging between the output module 270 of the charging unit 200 of FIG. 1 and the wireless power receiver 400.
7 is an operation diagram of a vehicle wireless power transmission device 10' according to another embodiment of the present invention.
8 to 13 are graphs showing charging efficiency according to the degree to which the battery cell module 430 of the wireless power receiver 400 is distant from the wireless power transmission devices 10 and 10' for a vehicle of FIGS. 1 and 7 .

Hereinafter, a wireless power transmission device for a vehicle 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 400 is mounted to a charging unit 200 of a wireless power transmitter 10 for a vehicle according to an embodiment of the present invention.

Referring to this drawing, the vehicle wireless power transmission device 10 may be installed on the dashboard D of the vehicle. To this end, the vehicle wireless power transmission device 10 may include a support unit 100, a charging unit 200, and a holding unit 300.

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 is configured to output a wireless power signal for charging the wireless power receiving device 400. 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 400 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 receiver 400 may be adhered to the adhesive pad 240 to face the charging surface 210a. A configuration for wirelessly charging the wireless power receiver 400 will be described later with reference to FIG. 6.

The holding unit 300 may be installed on the charging body 210. The holding unit 300 is configured to be variable in width or length, and is configured to support various sizes of wireless power receiver 400 such as a mobile phone or a music player.

The above-described wireless power transmission apparatus 10 for a vehicle will be described in more detail with reference to FIGS. 2 and 3.

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

Referring to the drawings, the vehicle wireless power transmission device 10 may include a support unit 100, a charging unit 200, and a holding unit 300.

Here, 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 suction 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 400. In addition, the adhesive pad 240 may be formed to have a uniform thickness, so that the wireless power receiver 400 may be spaced apart from the transmission 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.

The holding unit 300 may be installed on the charging body 210. Hereinafter, the holding unit 300 will be described with reference to FIGS. 4 and 5.

4 is an operation diagram of the holding unit 300 of the wireless power transmission device 10 for a vehicle of FIG. 1.

Referring to this drawing, the holding unit 300 may include clamping members 310 respectively disposed on both side portions 210c of the charging body 210. The clamping member 310 may include a first inclined portion 311 and a second inclined portion 312.

The first inclined part 311 may be extended from the sliding member 320 to be described later. Specifically, the first inclined part 311 may be formed to be inclined in a direction from the sliding member 320 toward the central axis X of the filling body 210. In addition, the first inclined portion 311 may be made of an elastic material. The second slope 312 may extend from the first slope 311. Specifically, the second inclined portion 312 may be formed to be inclined in a direction away from the central axis X of the charging body 210 in the first inclined portion 311.

According to this configuration, when the wireless power receiving device 400 is pressed toward the adhesive pad 240 in a state disposed in the first position P ₁ , the second inclined portion 312 is the wireless power receiving device 400 ), and naturally open up. Accordingly, the user can easily attach the wireless power receiver 400 to the adhesive pad 240.

In addition, when the wireless power receiving device 400 is disposed in the second position (P ₂ ), the first inclined portion 311 is elastically moved the edge of the wireless power receiving device 400 toward the adhesive pad 240. Pressure in the direction. Accordingly, the wireless power receiving device 400 is compressed with the adhesive pad 240 so that it cannot be easily escaped from it, and is in close contact with the adhesive pad 240 even when vibration occurs while driving the vehicle, resulting in excellent charging efficiency. Can keep.

5 is an operation diagram of the holding unit 300 of the wireless power transmission device 10 for a vehicle of FIG. 1.

Referring to this drawing, the holding unit 300 may further include a sliding member 320, a pinion gear 330, an elastic body 340, and a support member 350 in addition to the clamping member 310 described above. .

The sliding member 320 extends from the clamping member 310 and is formed to be retractable and retractable along the lateral direction (D ₁ ) of the charging body 210 with respect to both sides 210c of the charging body 210. I can. A rack gear 321 may be formed in the sliding member 320 along its longitudinal direction.

The pinion gear 330 may be embedded in the charging body 210. The pinion gear 330 is rotatably installed on the charging body 210 and may be formed to mesh with the rack gear 321 of the sliding member 320, respectively.

The elastic body 340 is configured such that both ends thereof are fixed to the sliding member 320 and the filling body 210, respectively. When the sliding member 320 is withdrawn from the charging body 210, the elastic body 340 may pull the sliding member 320 and return to the charging body 210 again.

The support member 350 is a configuration for supporting the wireless power receiver 400. The support member 350 may include a guide hole 351, a locking protrusion 352, a guide part 353, a pedestal 354, and a locking groove 355. The guide hole 351 is formed along the vertical direction (D ₂ ) of the charging body 210 in the lower portion 210d of the charging body 210, and the locking protrusion 352 is formed on the inner wall of the guide hole 351. I can. The guide part 353 may be slidably inserted into the guide hole 351. The pedestal 354 is formed to extend from the end of the guide part 353 and is configured to support the wireless power receiver 400. The locking grooves 355 may be formed on the outer surface of the guide portion 353 in a plurality along the length direction thereof, so that when the guide portion 353 slides, each of the locking projections 352 may be caught.

Hereinafter, a method of operating the holding unit 300 of the vehicle wireless power transmission device 10 will be described.

In this embodiment, the wireless power receiver 400 may be a portable electronic device such as a mobile phone or a music player, and may have various sizes. Specifically, the wireless power receiver 400 may be a relatively small music player, a larger mobile phone, or a larger note pad than a mobile phone.

In this case, the sliding member 320 may correspond to the wireless power receiver 400 of various sizes by varying the width between the clamping members 310 according to the size of the wireless power receiver 400. Here, according to the configuration of the rack gear 321 and the pinion gear 330 described above, when one of the two sliding members 320 is pulled by a predetermined length, the remaining sliding member 320 is also lateral (D ₁ ). ) Along the same length. Accordingly, the clamping member 310 is also spread by the same length with respect to the center of the charging body 210, thereby allowing the wireless power receiver 400 to be aligned with the central region of the charging body 210. , It is possible to maintain excellent charging efficiency for each of the wireless power receiver 400 having various sizes.

In addition, when the user pulls and releases the sliding member 320, the clamping member 310 is returned toward the charging body 210 by the elasticity of the elastic body 340 and presses the edge of the wireless power receiver 400 Is done. Accordingly, even when vibration occurs in the vehicle, the clamping member 310 may press the wireless power receiver 400 to be firmly pressed against the adhesive pad 240.

In addition, according to the configuration of the support member 350 described above, by adjusting the exposure length of the guide unit 353 according to the size of the wireless power receiver 400, it is possible to respond to the wireless power receiver 400 of various sizes. have. Specifically, by adjusting the exposure length according to the vertical direction (D ₂ ) of the guide unit 353 according to the size of the wireless power receiver 400, the wireless power receiver 400 in the vertical direction of the charging body 210 For each of the wireless power receiver 400 having various sizes, it is possible to maintain excellent charging efficiency by aligning it in its central area.

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 400 that is charged by receiving a power signal wirelessly corresponding to the charging unit 200 ) Will be described with reference to FIG. 6.

6 is a block diagram illustrating wireless charging between the output module 270 of the charging unit 200 of FIG. 1 and the wireless power receiver 400.

Referring to the drawings, a wireless power charging system according to an embodiment of the present invention includes a wireless power transmission device 10 for a vehicle and a wireless power reception device 400. By the electromagnetic induction method, when the vehicle wireless power transmitter 10 transmits a wireless power signal to the wireless power receiver 400, the wireless power receiver 400 receiving this power signal uses the power of the wireless power signal. The battery is charged or power is supplied to an electronic device connected to the wireless power receiving device 400.

Hereinafter, an operation relationship between the wireless power transmitter 10 for a vehicle, specifically the output module 270 of the charging unit 200 and the wireless power receiver 400 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 410 of the wireless power receiver 400 in an electromagnetic induction method, and in this embodiment, two coils (ie, 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 400 (that is, has a function as an ID confirmation unit), It performs a function of filtering and processing the charge state signal transmitted from the wireless power receiver 400. 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 430 or charging voltage is received, the function is filtered and processed.

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 400 receiving power by receiving a power signal includes a secondary coil 410 that generates induced power by the output power signal, a rectifier 420 that rectifies the induced power, and the rectified power It includes a battery cell module 430 to be charged, and a receiving control unit 440 for controlling the secondary coil 410, the rectifier 420 and the battery cell module 430.

The secondary coil 410 is a component for receiving a wireless power signal transmitted from the primary coil 271 of the output module 270.

The rectifying unit 420 rectifies the wireless power received from the secondary coil 410 to a DC voltage, and maintains a charged state at the charging voltage until charging starts.

The battery cell module 430 becomes a charging target that is charged through DC power from the rectifying unit 420 under the control of the reception control unit 440. Meanwhile, the battery cell module 430 includes a protection circuit such as an overvoltage and overcurrent prevention circuit, and a temperature detection 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 440 is a component that controls the current of the power charged by the rectifying unit 420 to allow an appropriate current to flow to the battery cell module 430.

Meanwhile, in order to detect the wireless power reception signal transmitted from the wireless power receiver 400 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 receiver 400 is received through the primary coil 271, 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 400 is charging.

Hereinafter, the operation of the wireless power transmission device 10 for a vehicle according to the above configuration will be described with reference to FIGS. 1 to 6 comprehensively.

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

The support unit 100 of the vehicle wireless power transmission device 10 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 in 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 400 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 400 is a mobile phone and an image is viewed through its display, the arrangement of the wireless power receiver 400 desired for each user may vary. At this time, the wireless power receiver 400 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 wireless power transmitter 10 and wireless charging for the wireless power receiver 400 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 400 for receiving the wireless power signal charges the battery cell module 430 as described with reference to FIG. 6.

7 is an operation diagram of a vehicle wireless power transmission device 10' 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, a method of operating the wireless power transmission device 10 for a vehicle will be described.

The cover 251 may be folded toward the adhesive pad 240 when the wireless power receiver 400 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, since the area that can be adhered to the wireless power receiver 400 is widened, the wireless power receiver 400 having a large size such as a smartphone or tablet with a large screen can be fixed more stably.

Hereinafter, a charging method according to a change in the mounting position of the wireless power receiver 400 for the vehicle wireless power transmission devices 10 and 10' will be described with reference to FIGS. 6 to 11.

8 to 13 are graphs showing charging efficiency according to the degree to which the battery cell module 430 of the wireless power receiver 400 is distant from the wireless power transmission devices 10 and 10' for a vehicle of FIGS. 1 and 7 .

Specifically, while the output module 270 is operating to charge the wireless power receiver 400, the wireless power receiver 400 on the wireless power transmitter 10 for a vehicle, specifically the battery cell module 430 Since the position is moved (including a change from the set position according to the size difference of the wireless power receiver 400), the power transmitted to the battery cell module 430 may be lower than the reference value. At this time, the wireless power receiving device 400 transmits a signal to the output module 270 to reinforce and transmit it. For example, assuming that the reference voltage is 5V and the reference deviation value is 0.5V, when the battery cell module 430 moves and receives a voltage lower than 4.5V, the reception control unit 440 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 430 from the output module 270 is illustrated in FIGS. 8 to 13. That is, FIGS. 8 to 11 show the case of the secondary side reference power of the battery cell module 430 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), the secondary side power (W) and efficiency (%) in the battery cell module 430. Here, the efficiency (%) is the efficiency for the output power applied to the secondary side of the battery cell module 430 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. 8 and 10, the secondary side power of the battery cell module 430 shows a graph between 2 and 2.5 W. Regarding the change in the horizontal distance and the vertical distance between the module 270 and the battery cell module 430, the charging efficiency when the output module 270 is charged without changing the frequency is shown. That is, when the battery cell module 430 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 430 decreases as the power of the secondary side of the battery cell module 430 decreases as it moves away from the center.

Accordingly, in FIGS. 9 and 11 compared with FIGS. 8 and 10, the battery cell module 430 is moved horizontally and vertically from the charging surface 210a of the wireless power transmission device 10 for a vehicle. It is shown that power is stably transmitted by changing the frequency in the output module 270 by receiving the information on the change in the received power at 430 and controlling the power by changing the frequency, whereby it can be seen that the power transmission efficiency is also in a good state.

And FIG. 12 is an efficiency graph for horizontal movement, and FIG. 13 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 wireless power transmission device for a vehicle 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 wireless power transmission device
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: holding unit
310: clamping member 320: sliding member
330: pinion gear 340: elastic body
350: support member 400: wireless power receiver

Claims (13)

A support unit having a support body installed on the vehicle;
A charging body connected to the support body, an adhesive pad installed to be exposed to the outside of the charging body, and outputting a wireless power signal with power input from a power jack of the vehicle, and attaching and fixing the wireless power signal to the adhesive pad A charging unit having an output module for transmitting to the wireless power receiver; And
A holding unit installed on the charging body and formed to support the wireless power receiving device placed on the adhesive pad,
The support unit,
Including a first connection formed on the support body,
The charging unit,
A wireless power transmission device for a vehicle that is installed on the charging body and includes a second connection part rotatably connected to the first connection part.
The method of claim 1,
The holding unit,
A wireless power transmission device for a vehicle including a clamping member protruding from the side of the charging body to support the wireless power receiving device.
The method of claim 2,
The clamping member,
A first inclined portion formed from a side portion of the filling body toward a central axis of the filling body and made of a material having elasticity; And
A wireless power transmission device for a vehicle comprising a second inclined portion extending from the first inclined portion and formed to be inclined in a direction away from the central axis of the charging body.
The method of claim 2,
The holding unit,
A wireless power transmission device for a vehicle that extends from the clamping member and further comprises a sliding member formed to be retractable and retractable from the side of the charging body.
The method of claim 4,
The sliding members are installed on both sides of the filling body, respectively,
The holding unit,
A rack gear formed along the length direction of each of the sliding members; And
A wireless power transmission device for a vehicle, which is rotatably installed on the charging body and includes a pinion gear formed to mesh with the rack gear.
The method of claim 4,
The holding unit,
Each of the sliding member and the charging body are fixed to both ends thereof, further comprising an elastic body to return the sliding member toward the charging body, wireless power transmission device for a vehicle.
The method according to claim 1 or 2,
The holding unit,
A wireless power transmission device for a vehicle including a support member protruding from a lower portion of the charging body to support the wireless power receiving device.
The method of claim 7,
The support member,
A guide hole formed in the lower portion of the filling body;
A guide part slidably installed with respect to the guide hole; And
A wireless power transmission device for a vehicle including a pedestal formed bent in the guide part to support the wireless power receiving device.
The method of claim 8,
The support member,
A locking protrusion formed on the inner wall of the guide hole; And
The vehicle wireless power transmission device further comprises a locking groove formed on the outer surface of the guide part along its longitudinal direction and formed to be caught with the locking projections when the guide part slides.
The method of claim 1,
The support unit,
A connection jack formed to be connected to a power jack of the vehicle; And
Further comprising a first terminal installed on the first connection portion and electrically connected to the connection jack,
The charging unit,
Further comprising a second terminal installed on the second connection portion and connected to the first terminal,
The output module,
Formed to receive the power through the second terminal, wireless power transmission device for a vehicle.
The method of claim 1,
The adhesive pad,
A wireless power transmission device for a vehicle, which is formed of at least one material of silicone gel and polyurethane gel.
The method of claim 1,
The output module,
A transmission coil built into the charging body and oscillating the wireless power signal; And
And a transmission control unit for controlling oscillation of the wireless power signal by the transmission coil.
The method of claim 1,
The support body,
A support module having a support surface supported by the vehicle; And
A wireless power transmission device for a vehicle further comprising an extension part extending from the support module to the first connection part.

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