JP2022171154A - Wireless power feeding system - Google Patents

Abstract

To provide a system capable of placing a wireless power incoming device at an appropriate position while having a simple configuration.SOLUTION: A transmission side coil 8 is provided on a wireless power transmission device 6. LEDs 10a and 10B, which are position indicator lamps, are provided on a center line of the transmission side coil 8 and are always lit. The LEDs 10a and 10b are provided on both sides of the transmission side coil 8 at symmetrical positions with respect to the transmission side coil 8. LEDs 12a and 12b are provided as power-feeding indicator lamps outside the LEDs 10a and 10b. The LEDs 12a and 12b are extinguished in a normal state. When a user places a smartphone 20, which is a wireless power incoming device, on the transmission side coil 8, the wireless power transmission device 6 determines that power can be supplied and lights the LEDs 12a and 12b. Thereby, the user can confirm that the power is fed.SELECTED DRAWING: Figure 1

Description

The present invention relates to a wireless power feeding system.

Wireless power supply is used in smartphones, control devices, and the like. For example, electromagnetic induction between a transmitting coil provided in the wireless power transmitting device and a receiving coil provided in the wireless power receiving device is configured to feed power from the wireless power transmitting device to the wireless power receiving device.

At this time, if the receiving coil of the wireless power receiving device and the transmitting coil of the wireless power transmitting device are not magnetically coupled appropriately by electromagnetic induction, the power supplied may decrease or the power may not be supplied. .

For this reason, for example, as in Patent Document 1, there is a wireless power transmission device in which a transmitter coil is configured to be movable, and is driven and controlled so as to be positioned appropriately with respect to a receiver coil. According to this technique, even if the relative positional relationship between the receiving coil and the transmitting coil is deviated, the positional relationship between the two coils can be set to an appropriate position for power supply.

JP 2019-170135

However, the conventional technique as described above has the problem of complicating the structure of the device because it is necessary to drive the transmitting coil. In addition, there are cases where driving noise is generated, which is annoying in use.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to provide a system that has a simple configuration and allows a wireless power receiving device to be placed at an appropriate position.

Several independently applicable features of the invention are listed below.

(1) A wireless power transmission device according to the present invention includes a transmission side coil for performing wireless power transmission with a reception side coil of a wireless power reception device, and a wireless power reception device provided on the transmission side coil. A mounting surface for the wireless power receiving device, the mounting surface having position marks for indicating the position where the wireless power receiving device is to be mounted on both sides of the transmitting coil on a line passing near the center of the transmitting coil. and a control unit that acquires information data from the wireless power receiving device via the transmitting coil and controls power supply to the transmitting coil, wherein a power supply display is provided on the mounting surface. a light is provided, and the control unit determines whether power can be supplied from the transmitting coil to the receiving coil based directly or indirectly on information data from the wireless power receiving device; The power supply display lamp is set to the first state when it is determined that power cannot be supplied, and the power supply display lamp is set to the second state when it is determined that power can be supplied.

Therefore, the position mark serves as a reference for the position where the wireless power receiving device is to be placed, and the power supply indicator lamp can be used to know the position with certainty.

(2) The wireless power transmission device according to the present invention is characterized in that a power supply indicator light is provided outside the position mark on a line passing through the vicinity of the center of the power transmission side coil.

Therefore, it is possible to easily confirm that the power is being supplied.

(3) The wireless power transmitting device according to the present invention is characterized in that the position mark is a light emitter that is constantly lit while power is being supplied to the wireless power feeding device.

Therefore, the visibility is good, and positioning is easy when the wireless power receiving device is placed.

(4) The wireless power transmission device according to the present invention is characterized by using a power supply indicator lamp as the position mark.

Therefore, the configuration can be simplified.

(5) The wireless power transmission device according to the present invention is characterized in that the power supply indicator lamp includes a linear light source arranged along a line passing through the vicinity of the center of the power transmission side coil.

Therefore, visibility is good and alignment is easy.

(6) The wireless power transmission device according to the present invention is characterized in that the first state of the power supply indicator lamp is off, and the second state of the power supply indicator lamp is on.

Therefore, it is possible to distinguish between states by turning off and turning on.

(7) The wireless power transmission device according to the present invention is characterized in that the first state of the power supply indicator lamp is lighting in the first color, and the second state of the power supply indicator lamp is lighting in the second color.

Therefore, the states can be distinguished by color.

(8) A wireless power transmitting device according to the present invention includes a transmitting coil for wirelessly transmitting power to a receiving coil of a smart phone, and a mount on which the smart phone is placed, provided on the transmitting coil. A placement surface having position indicator lamps that are always lit to indicate the position where the smartphone is to be placed on both sides of the transmission coil on a line that passes through the vicinity of the center of the transmission coil. and a control unit that acquires information data from the smartphone via the transmission-side coil and controls power supply to the transmission-side coil, wherein a power supply indicator is provided on the mounting surface. and at least a portion of the power supply indicator light is visible on both sides of a short width of the smartphone when the smartphone is placed in a position where power can be supplied from the transmitter coil to the receiver coil of the smartphone. and the control unit directly or indirectly based on information data from the smartphone to determine whether power can be supplied from the transmitting coil to the receiving coil of the smartphone, and determines whether power can be supplied. If it is determined that power can be supplied, the power supply indicator lamp is set to the first state, and if it is determined that power can be supplied, the power supply indicator lamp is set to the second state.

Therefore, the position indicator light serves as a guideline for the position where the smartphone is placed, and the power supply indicator light can be used to know the exact position.

(9) A wireless power supply system according to the present invention is a wireless power supply system including a wireless power transmission device and a wireless power reception device having a flat display, wherein the wireless power transmission device is connected to a receiving coil of the wireless power reception device. a transmitter coil for wirelessly transmitting power in the transmitter coil, and a mounting surface provided on the transmitter coil for mounting the wireless power receiving device, the mounting surface being on a line passing through the vicinity of the center of the transmitter coil. Acquiring information data from the wireless power receiving device through a mounting surface having position marks for indicating a position where the wireless power receiving device is mounted on both sides of the transmitting coil, and the transmitting coil, A control unit for controlling power supply to a transmitting coil, wherein the wireless power receiving device includes a recording unit for recording the position of the receiving coil of the wireless power receiving device, and a state in which power can be received from the wireless power transmitting device. Then, receiving side coil position display means for displaying the receiving side coil position indicating the position of the receiving side coil at a position of the flat display corresponding to the recorded position of the receiving side coil is provided. .

Therefore, the receiving side coil position display enables more appropriate alignment.

(10) In the wireless power supply system according to the present invention, the position mark has at least a horizontal position mark, and the receiving side coil position display is a display corresponding to the vertical center line of the receiving side coil. , and a display corresponding to the lateral center line of the power receiving side coil.

Therefore, alignment in the vertical and horizontal directions is easy.

(11) A wireless power receiving device according to the present invention is a wireless power receiving device capable of receiving power from a wireless power transmitting device, comprising: a receiving coil for receiving power from a transmitting coil of the wireless power transmitting device; A recording unit that records the position of the receiving side coil of the device, and when it becomes ready to receive power from the wireless power transmission device, the power receiving side coil is placed at the position of the flat display corresponding to the recorded position of the receiving side coil. power supply display control means for displaying the position of the receiving side coil indicating the position of the

Therefore, it is easy to align the wireless power receiving device.

(12) A wireless power transmitting device according to the present invention is characterized in that the wireless power receiving device is a smart phone or a tablet computer.

Therefore, it becomes easier to align the smart phone or tablet computer.

(13) A wireless power transmitting device according to the present invention is characterized in that the wireless power transmitting device is a desk whose mounting surface is a desk surface.

Therefore, charging can be performed simply by placing the wireless power receiving device on the desk.

In the embodiment, step S35 corresponds to the "receiving side coil position display means".

"Program" is a concept that includes not only programs that can be directly executed by the CPU, but also programs in source format, compressed programs, encrypted programs, and the like.

Fig. 2 shows a desk 2 embedded with a wireless power transmitting device 6 according to an embodiment of the invention; 4 is an enlarged cross-sectional view of the vicinity of the wireless power transmission device 6; FIG. 3 is a perspective view of the wireless power transmission device 6; FIG. 2 shows the hardware configuration of the wireless power transmission device 6 and the control unit of the smartphone 20. FIG. 6 is a flowchart of power supply processing; FIG. 10 is a diagram showing operations of LEDs 10a and 10b as position marks and LEDs 12a and 12b as power supply indicator lights; FIG. 10 is a diagram showing position marks, power supply indications, etc., according to another example; It is an example of receiving side coil position display. This is an example in which an LED as a position mark and an LED as a power supply indicator are shared. Fig. 2 shows a desk 2 in which a wireless power transmission device 6 according to a second embodiment is embedded; 2 shows the hardware configuration of the wireless power transmission device 6 and the smartphone 20. FIG. 6 is a flowchart of power supply processing; 6 is a flowchart of power supply processing; It is an example of recommendation of charge and a receiving side coil position display.

1. 1st embodiment
1.1 Overview FIGS. 1A and 1B show the appearance of a wireless power transmission device 6 according to one embodiment of the present invention. In this embodiment, it is constructed as a desk in which the wireless power transmission device is embedded. 1A and 1B are top views of the desk 2. FIG. A wireless power transmission device 6 is embedded in part of the back side of the top plate 4 of the desk 2 .

As shown in FIG. 1A, the wireless power transmission device 6 is provided with a transmission side coil 8 . LEDs 10a and 10b, which are position indicator lights, are provided on the center line of the transmitting coil 8. As shown in FIG. The LEDs 10 a and 10 b are always lit by the power supplied to the wireless power transmission device 6 . The LEDs 10 a and 10 b are provided on both sides of the transmitter coil 8 at symmetrical positions with respect to the transmitter coil 8 . Therefore, the user can easily estimate the position of the transmission coil 8 .

LEDs 12a and 12b are provided as power supply indicator lights outside the LEDs 10a and 10b. The LEDs 12a and 12b are extinguished in a normal state.

When the user places the smartphone 20, which is a wireless power receiving device, on the transmitting coil 8, it is determined that the wireless power transmitting device 6 is ready for power supply, and the LEDs 12a and 12b are turned on. This allows the user to confirm that power is supplied.

Also, since the LEDs 10a and 10b are lit, it is possible to easily know where the transmitting coil 8 is located on the desk 2 having a large area. In addition, since the LEDs 10a and 10b are provided at symmetrical positions with respect to the transmitting coil 8, placing the smartphone 20 between them makes it easy to place the smart phone 20 at an appropriate position. In addition, the receiver coil is often provided near the center in the longitudinal direction of the smartphone 20, and the LEDs 10a and 10b are provided on the center line of the transmitter coil 8, so that the smartphone can be easily placed at an appropriate position. be.

1.2 Structure of Wireless Power Transmission Device FIG. 2A shows a cross-sectional view near the wireless power transmission device 6 provided on the top plate 4 of the desk 2 . The top plate 4 is provided with a recess, and the wireless power transmission device 6 is housed in the recess. A transmitter coil 8 is provided on the upper surface of the wireless power transmission device 6, and LEDs 10a, 10b and LEDs 12a, 12b are provided on both sides thereof.

A translucent melanin plate 4 a (other translucent members may be used) is provided on the top plate 4 to cover the wireless power transmission device 6 . The upper surface of the melanin plate 4a serves as a mounting surface 18. As shown in FIG. When the LEDs 10a, 10b and the LEDs 12a, 12b are lit, the light passes through the melanin plate 4a and can be confirmed by the user. On the other hand, in this embodiment, since the melanin plate 4a is not a transparent member, when the LEDs 10a, 10b and the LEDs 12a, 12b are turned off, their existence cannot be recognized.

FIG. 2B shows a cross-sectional view of the wireless power transmitting device 6. As shown in FIG. A magnetic flux control plate 3 for controlling magnetic flux is provided under the transmitting coil 8 . A heat sink 5 is provided under it.

A base plate (not shown) is provided at the bottom, and a heat dissipation fan 13 is provided thereon. A spacer 11 is arranged between the heat radiating fan 13 and the heat radiating plate 5 to form a space. A control unit 60 is accommodated in the space.

FIG. 3 shows a perspective view of the wireless power transmitting device 6. As shown in FIG. A transmission coil 8 is provided on the upper portion.

1.3 Hardware Configuration FIG. 4 shows the control unit of the wireless power transmission device 6 and the control unit of the smart phone 20 . An I/O port 32 , a demodulation circuit 34 , a nonvolatile memory 36 and a driver 38 are connected to the CPU 30 of the wireless power transmission device 6 . LEDs 10 a , 10 b , 12 a and 12 b and the motor 15 of the cooling fan 13 are connected to the I/O port 32 . The LEDs 10a and 10b are controlled to be lit all the time. Alternatively, the LEDs 10a and 10b may be directly connected to a power supply circuit so that they are always lit.

The driver 38 controls the frequency and duty ratio of the AC signal supplied to the transmitting coil 8 . With such control, the power to be transmitted can be controlled.

An operating system 40 (for example, TRON) and a control program 42 are recorded in the nonvolatile memory 36 . The control program 42 cooperates with the operating system 40 to exert its functions.

A modulation circuit 52 and a charging circuit 56 are connected to the CPU 50 of the smartphone 20 . The CPU 50 is a CPU for controlling wireless charging, and a CPU for controlling the entire smart phone 20 is provided separately. Note that the CPU 50 can exchange data with a CPU that controls the entire smartphone. The CPU 50 controls each part by means of an operating system and control programs recorded in a non-volatile memory (not shown).

The rectifier circuit 54 rectifies the high-frequency signal received by the receiving coil 58 and converts it into direct current. The charging circuit 56 raises or lowers the voltage to make the output of the rectifier circuit 54 a desired voltage, and charges the secondary battery of the smartphone 20 .

Further, in this embodiment, data can be transmitted from the smartphone 20 side to the wireless power transmitting device 6 by back-contrast modulation based on the Qi standard. The CPU 50 of the smart phone 20 performs data communication as follows. The CPU 50 gives data to be transmitted to the modulation circuit 52 . The modulation circuit 52 amplitude-modulates the voltage of the receiving coil 58 with the data. This amplitude change is transmitted to the transmitting coil 8 by electromagnetic induction. The demodulation circuit 34 detects this amplitude change and demodulates the data. The CPU 30 acquires this.

As described above, data can be transmitted from the smartphone 20 to the wireless power transmission device 6 .

1.4 Power supply processing Fig. 5 shows a flow chart of power supply processing. The control program 42 of the wireless power transmission device 6 is on the left side, and the control program of the smartphone 20 is on the right side.

The CPU 30 of the wireless power transmission device 6 (hereinafter sometimes abbreviated as the wireless power transmission device 6) controls the driver 38 to apply a voltage of a predetermined frequency to the transmission coil 8 at predetermined time intervals (for example, every 600 msec). (step S1). At this time, if the smartphone 20 is not placed on the placing surface 18, there is no communication from the smartphone 20. FIG. Therefore, the wireless power transmitting device 6 repeats voltage application at predetermined time intervals.

FIG. 6A shows a state near the wireless power transmission device 6 when the smartphone 20 is not placed on the placement surface 18 . The LEDs 10a and 10b arranged on a straight line 7 passing through (or in the vicinity of) the center point 9 of the transmitting coil 8 wound in a circular shape are lit. Since the LEDs 10a and 10b are provided at target positions with the transmitting coil 8 interposed therebetween, the user can easily estimate the position of the transmitting coil 8. FIG. Therefore, it is preferable that the distance between the LEDs 10 a and 10 b be wider than the width of the smartphone 20 .

LEDs 12a, 12b are provided outside the LEDs 10a, 10b, also on the straight line 7 . In the state of FIG. 6A, the LEDs 12a and 12b are off.

When the smartphone 20 is placed on the mounting surface 18 , the AC voltage applied to the transmission coil 8 is transmitted to the reception coil 18 by electromagnetic induction. The CPU 50 of the smartphone 20 (hereinafter sometimes abbreviated as the smartphone 20) determines whether or not an AC voltage is generated in the reception coil 18 (step S21). Upon receiving the AC voltage from the wireless power transmission device 6, step S22 is executed.

In step S<b>22 , the smartphone 20 uses the modulation circuit 52 to amplitude-modulate the AC voltage with data indicating the individual identification information of the smartphone and power transmission conditions (conditions such as how many watts can be received). This amplitude modulation change also occurs in the transmitting coil 8 . The demodulation circuit 34 of the wireless power transmission device 6 demodulates the amplitude-modulated AC voltage to obtain the individual identification information, power transmission conditions, and the like. The CPU 30 of the wireless power transmission device 6 acquires this (step S2).

The wireless power supply device 6 acquires individual identification information, power transmission conditions, and the like from the smartphone 20, and controls the LEDs 12a and 12b to light up if the other smartphone 20 conforms to the wireless power supply standard used by itself. (Step S3). At this time, the wireless power supply device 6 drives the motor 15 to operate the cooling fan 13 .

FIG. 6 shows a state in which the smartphone 20 is placed on the mounting surface 18. As shown in FIG. The LEDs 12a, 12b are also illuminated to indicate that the smart phone 20 has been placed properly and power supply has started.

Next, the wireless power transmission device 6 starts power transmission by applying an AC voltage to the transmission coil 8 based on the received power transmission conditions (step S4). The smartphone 20 receives the AC voltage through the receiving coil 58 , passes through the rectifier circuit 54 , and charges the secondary battery (battery) of the smartphone 20 with the charging circuit 56 .

The smartphone 20 detects the voltage of the charging circuit 58 and the like, and uses the modulation circuit 52 to transmit this as power reception state data to the wireless power transmission device 60 (step S23).

The wireless power transmission device 6 acquires power reception state data via the demodulation circuit 34 (step S5). Subsequently, the wireless power transmission device 6 feedback-controls the power transmission amount based on this power reception state data (step S6). For example, when the amount of received power is small, the amount of transmitted power is increased, and when the amount of received power is large, the amount of transmitted power is controlled to decrease. The wireless power transmission device 6 controls the power transmission amount by changing the frequency and duty ratio of the AC voltage applied to the transmission coil 8 .

Charging by wireless power supply is performed as described above. The smartphone 20 monitors the control state of the charging circuit 56 and determines whether or not charging has been completed (step S24). If charging is not completed, step S23 is repeatedly executed.

When charging is completed, the smart phone 20 transmits charging completion via the modulation circuit 52 (step S25). When the wireless power transmission device 6 receives the completion of charging via the demodulation circuit 34 (step S7), the process ends.

Note that the wireless power transmission device 6 ends the process even when the smartphone 20 is moved from the mounting surface 18 and data communication from the smartphone 20 ceases for a predetermined period of time. In this case, the wireless power transmission device 6 can turn off the LEDs 12a and 12b to inform the user that charging is not being performed.

As described above, when the smartphone 20 is placed in a predetermined position for charging, the approximate position can be confirmed by the LEDs 10a and 10b. It will illuminate to confirm proper charging.

Note that the configuration of the wireless power supply device 6 shown in FIG. 4 may use a custom IC for wireless power supply such as KT-CG10W3 from Kington and bp500211 from Texas. In this case, the LEDs 12a and 12b may be turned on when the signal terminal indicating the start of charging is turned on.

1.5 Miscellaneous
(1) In the above embodiment, the position marks LEDs 10a and 10b and the power supply indicator lights LEDs 12a and 12b are arranged on the center line of the transmitting coil 8 (or on a line 10 mm or less away from the center line). . However, it is not necessary to place them on the centerline of the transmitting coil 8 .

However, it is preferable to provide at least the position mark on the center line in order to facilitate position confirmation. For example, as shown in FIG. 7A, only one LED 12 serving as a power supply indicator may be provided on the upper left.

(2) In the above embodiment, the LEDs 10a and 10b as the position marks and the LEDs 12a and 12b as the power indicator lamps are point light sources. However, as shown in FIG. 7B, linear LEDs 10, 12 may be used. The position mark LED 10 is always lit, and the power supply indicator LED 12 is controlled to be lit when power is supplied. In this case, the length of LEDs 10 and 12 is preferably greater than the width of smartphone 20 .

Also, linear LEDs and point LEDs may be used in combination. Furthermore, characters (characters such as "charging position"), codes, or the like may be displayed as the position mark by the display light source. Similarly, a display light source that displays characters (characters such as "Charging") or a code may be used as the power supply indicator lamp.

(3) LEDs are used in the above embodiments. However, other displays such as organic EL and liquid crystal may be used.

Furthermore, a display may be provided on the wireless power transmission device 6, and a position mark and power supply display may be displayed on this display.

(4) In the above embodiment, the position marks are formed by the LEDs 10a and 10b as light sources. However, the position mark may be formed by printing on the placement surface 18, or by providing a concave portion or a convex portion. Alternatively, a position mark may be formed by embedding a member having a different color or the like. FIG. 7C shows an example in which the position marks are printed marks 70a and 70b. A position mark such as a print may be a line instead of a point. Further, characters, symbols, and the like may be used.

(5) In the above embodiment, the LEDs 10a and 10b as position marks and the LEDs 12a and 12b as power indicator lamps are arranged on the center line 7 in the lateral direction. However, as shown in FIG. 7D, LEDs 10c and 10d as position marks and LEDs 12c and 12d as power supply indicator lights may also be arranged on the center line 17 in the vertical direction. Alternatively, the LEDs 10c and 10d as position marks and the LEDs 12c and 12d as power supply indicator lamps may be arranged only on the center line 17 in the vertical direction.

(6) In addition to the above embodiment, when the start of power reception is detected on the smartphone 20 side (steps S22 and S23), the CPU that controls the entire smartphone 20 obtains this and performs the following processing. good. The CPU reads out the pre-recorded positions of the receiving coils of its own device. The receiving coil position for positioning is displayed at the position on the display corresponding to that position.

FIG. 8 shows an example of the receiving side coil position display displayed on the display. For power transmission, it is preferable that the transmitting coil 8 and the receiving coil 18 are not misaligned. Even if there is a slight deviation, power transmission is possible, but the efficiency will drop.

In the example of FIG. 8, the mark 80 indicating the position of the receiving coil 18 is slightly displaced downward from the LEDs 10a, 10b of the position marks indicating the position of the transmitting coil 8. In FIG. The user can move the smart phone 20 to match the two. At this time, the horizontal center line 82 displayed on the display serves as a guide for matching.

Note that when the positions are shifted in the horizontal direction (especially effective in the case of a tablet, etc.), the vertical center line 84 can be used as a guideline for matching.

Also, in FIG. 8, the LEDs 12a and 12b are provided as power supply indicator lamps, but the receiving side coil position indicator 80 may be used as a power supply indicator and the LEDs 12a and 12b may not be provided.

(7) In the above embodiment, LEDs 10a and 10b as position marks and LEDs 12a and 12b as power supply indicator lamps are provided. However, as shown in FIG. 9, they may be configured by common LEDs 11a and 11b.

As shown in FIG. 9A, while smartphone 20 is not placed, LEDs 11a and 11b are controlled by CPU 30 to emit light in a first color (for example, orange). As shown in FIG. 9B, when smartphone 20 is placed, LEDs 11a and 11b are controlled by CPU 30 to emit light in a second color (eg, blue).

It should be noted that the same color may be emitted, and the light emission mode (lighting interval, etc.) may be changed so that they can be distinguished from each other.

(8) In the above embodiment, the LEDs 10a, 10b and the LEDs 12a, 12b are provided under the non-transparent and translucent melanin plate 4a. However, the LEDs 10a, 10b and the LEDs 12a, 12b may be provided under the transparent thin plate so that their presence can be confirmed even when the lights are turned off. Alternatively, the LEDs 10a, 10b and the LEDs 12a, 12b may not be covered with the melanin plate 4a so that their presence can be confirmed even when the lights are turned off.

In this case, the light may be turned off before the smartphone 20 is placed, and then turned on when the smart phone 20 is placed. The LEDs 11a and 11b that are not illuminated serve as position marks. The light source may be linear instead of point-like, or may display characters or symbols.

(8) In the above embodiment, the smart phone 20 is used as an example of the wireless power receiving device. However, it can be applied to general devices that require power supply, such as tablet computers, personal computers, notebook computers, desk fans, small lighting fixtures such as task lights, transmitters such as Wi-Fi, and shoes equipped with GPS receivers. Further, in the above embodiment, the case of charging is described, but the same can be applied to a device that operates by wireless power supply without charging.

(9) In the above embodiment, the case where the wireless power transmission device 6 is embedded in the desk has been described. However, if the wireless power receiving device such as the smartphone 20 can be placed, it can be embedded in other furniture such as a table, shoe box, floor surface, wall surface (requiring a mechanism to hold the smartphone 20), etc. You may do so.

Alternatively, the wireless power receiving device 6 may be used alone as a charging device or a power feeding device without embedding it.

(10) In the above embodiment, wireless power supply based on the Qi standard has been described, but wireless power supply based on other systems such as the PMA standard and the Rezence standard can also be applied.

(11) The above embodiment and its modifications can be implemented in combination with other embodiments and their modifications as long as they do not contradict the essence.

2. Second embodiment
2.1 Overview FIG. 10 shows an overview of the wireless power transmission system according to the second embodiment. In this embodiment, the wireless power transmission device 6 is provided with an NFC transceiver 25 .

When the NFC transceiver (not shown) of the smart phone 20 approaches the wireless power transmitting device 6, it can receive the signal from the NFC transceiver 25 and detect that the wireless power transmitting device 6 is nearby.

The smartphone 20 acquires the remaining battery level of its own device, and if the remaining battery level is less than a predetermined value, displays on the display that it is preferable to charge the battery. Further, the position of the receiving coil for wireless power feeding recorded in the device is read, and the receiving coil position display 80 is displayed at the corresponding position on the display.

A user who intends to charge places the smartphone 20 between the LEDs 10a and 10b as position marks. At this time, the reception side coil position display 80 displayed on the display of the smartphone 20 enables accurate positioning.

When the smartphone 20 is placed, the LEDs 12a and 12b, which are power supply indicator lamps, light up as in the first embodiment.

According to this embodiment, when the remaining battery level of the smartphone 20 or the like is low, the smartphone 20 can display a message prompting charging if the wireless power transmission device 6 is nearby.

Furthermore, since the position of the receiving coil is displayed on the display, alignment is easy.

2.2 Structure of Wireless Power Transmission Device The basic structure of the wireless power transmission device 6 is the same as in the first embodiment. However, it differs in that an NFC transmitter/receiver 25 is provided. The NFC transceiver 25 may be provided integrally with the wireless power transmission device 6, or may be provided separately.

2.3 Hardware Configuration FIG. 11 shows the hardware configuration of the wireless power transmitting device 6 and the smartphone 20. As shown in FIG. The configuration of the wireless power transmission device 6 is similar to that of the first embodiment, but differs in that the NFC transceiver 25 is connected to the CPU 30 and can be controlled by the CPU 30 .

FIG. 11 shows the CPU 90 that controls the smartphone 20 as a whole. A touch display 92 , an NFC transceiver 95 , a communication circuit 97 , and a nonvolatile memory 94 are connected to the CPU 90 . The communication circuit 97 is for connecting to the Internet. In the figure, communication circuits and the like are omitted. The CPU 90 is also configured to be able to exchange data with the CPU 50 for controlling wireless power supply.

An operating system 96 and a control program 98 are recorded in the nonvolatile memory 94 . The control program 98 cooperates with the operating system 96 to exert its functions.

2.4 Power Supply Processing FIGS. 12 and 13 show flowcharts of power supply processing. In FIG. 12 , the processing of the control program 42 of the wireless power transmission device 6 is shown on the left side, and the processing of the control program 98 of the smartphone 20 is shown on the right side.

The CPU 30 of the wireless power transmission device 6 (hereinafter sometimes abbreviated as the wireless power transmission device 6) applies an AC voltage to the transmission coil 8 at predetermined time intervals (step S1). This processing is the same as in the first embodiment.

Also, the wireless transmission device 6 controls (or autonomously) the NFC transceiver 25 to transmit a polling signal (step S11). As shown in FIG. 10 , when the smartphone 20 is near the wireless power transmission device 6 , the NFC transmitter/receiver 95 of the smartphone 20 receives this polling signal, and confirms the communication method with the NFC transmitter/receiver 25 . Communication is established by confirming the other party (steps S12 and S32).

The CPU 90 of the smart phone 20 (hereinafter sometimes abbreviated as the smart phone 90 ) knows that the wireless power transmitting device 6 exists nearby by establishing communication with the NFC transmitter/receiver 25 of the wireless power transmitting device 6 . The smartphone 20 determines whether or not its remaining battery level is equal to or less than a predetermined value (for example, 30% or less) (step S33). If the remaining amount is not less than the predetermined value and sufficient remaining amount remains, step S21 of FIG. 13 is executed.

If the battery level is equal to or less than the predetermined value and there is not enough remaining battery power remaining, the smartphone 20 displays a recommendation to the effect that it is preferable to charge the battery on the touch display 92 (step S34). An example of displayed recommendations is shown in FIG.

Subsequently, the smartphone 20 reads the position information of its own receiving coil 58 recorded in the nonvolatile memory 94 . The position of the reception coil 58 is determined for each model of the smartphone 20 . This is recorded in the nonvolatile memory 94 in advance.

In addition, the position of the receiving coil 58 of each model of each manufacturer is investigated in advance, and a server device (not shown) is prepared in which the model number is recorded in correspondence with the model number, and the model number is transmitted to this device. , the position of the receiving coil 58 may be obtained.

In this embodiment, the position of the center point of the reception coil 58 is indicated by the XY coordinates in the horizontal direction (Y) and the vertical direction (X) with the lower left corner of the touch display 92 as the origin. A DB representing the position of 58 is recorded in the server device.

Also, although the size of the receiving coil 58 varies depending on the model, it is assumed to be the same size in this embodiment. This is because it is sufficient to know the center point. Of course, the size of the receiving coil 58 may also be registered in the DB.

The smartphone 20 displays the receiving coil position display 80 at a position on the touch display 92 corresponding to the acquired position of the receiving coil 58 (step S35). FIG. 14 shows an example of the receiver coil position display 80. As shown in FIG.

Since the user knows that the receiver coil 58 is at this position, the user can easily locate the receiver coil 58 by aligning the line connecting the position marks 10a and 10b of the desk 2 with the center line 99 of the receiver coil position display 80. Alignment can be ensured.

The receiving side coil position display 80 may be displayed as shown in FIG.

The processing after the smartphone 20 is placed at the position of FIG. 10B is the same as in the first embodiment (see FIG. 13).

As described above, according to this embodiment, it is possible to indicate that the wireless power transmitting device 6 is nearby when the remaining battery level is low, and to perform a display that facilitates positioning.

2.5 Miscellaneous
(1) In the above embodiment, both charging recommendation and receiving side coil position display are performed. However, only one of them may be performed.

Moreover, although the above processing (recommendation of charging and reception side coil position display) is performed only when the remaining battery charge is equal to or less than a predetermined value, these processing may be performed regardless of the remaining battery charge.

(2) In the above embodiment, charging recommendations are displayed on the touch display 92 . However, it may be output by sound or vibration (controlled by the CPU 90 so that the vibrator is operated).

(3) The above embodiments and their modifications can be implemented in combination with other embodiments and their modifications as long as they do not contradict their essence.

Claims (13)

a transmitting coil for wireless power transmission with a receiving coil of a wireless power receiving device;
A mounting surface provided on the transmitter coil for mounting the wireless power receiver on a line passing through the vicinity of the center of the transmitter coil and on both sides of the transmitter coil. a placement surface having a position mark for indicating the position to place the
a control unit that acquires information data from the wireless power receiving device via the transmission coil and controls power supply to the transmission coil;
A wireless power transmission device comprising:
A power supply indicator light is provided on the mounting surface,
The control unit determines whether power can be supplied from the transmitting coil to the receiving coil based directly or indirectly on information data from the wireless power receiving device. 1. A wireless power transmission device characterized by putting an indicator light in the first state and, if it is determined that power can be supplied, bringing the power supply indicator light into the second state. The wireless power transmission device of claim 1,
The wireless power transmission device, wherein the power supply indicator lamp is provided outside the position mark on a line passing near the center of the power transmission side coil. The wireless power transmission device according to claim 1 or 2,
The wireless power transmission device, wherein the position mark is a light emitter that is always lit while power is supplied to the wireless power transmission device. The wireless power transmission device of claim 1,
A wireless power transmitting device, wherein the power supply indicator lamp is used as the position mark. The wireless power transmission device of claim 4,
The wireless power transmission device, wherein the power supply indicator lamp includes a linear light source arranged along a line passing through the vicinity of the center of the power transmission side coil. In the wireless power transmission device according to any one of claims 1 to 5,
a first state of the power supply indicator light is off;
The wireless power transmission device, wherein the second state of the power supply indicator light is lighting. In the wireless power transmission device according to any one of claims 1 to 5,
the first state of the power supply indicator light is lighting in a first color;
The wireless power transmitting device, wherein the second state of the power supply indicator lamp is lighting in a second color. A transmitting coil for wireless power transmission with the receiving coil of the smartphone,
A placement surface provided on the transmitting coil for placing the smartphone, the smartphone being placed on both sides of the transmitting coil on a line passing near the center of the transmitting coil. a mounting surface having a permanently lit position indicator light to indicate the position;
a control unit that acquires information data from the smartphone via the transmission coil and controls power supply to the transmission coil;
A wireless power transmission device comprising:
A power supply indicator light is provided on the mounting surface,
At least part of the power supply indicator light is arranged to be visible on both sides of the short width of the smartphone when the smartphone is placed in a position where power can be supplied from the transmitting coil to the receiving coil of the smartphone,
The control unit determines whether or not power can be supplied from the transmitting coil to the receiving coil of the smartphone based directly or indirectly on information data from the smartphone, and supplies power if it is determined that power cannot be supplied. 1. A wireless power transmission device characterized by putting an indicator light in the first state and, if it is determined that power can be supplied, bringing the power supply indicator light into the second state. A wireless power supply system comprising a wireless power transmitting device and a wireless power receiving device having a flat display,
The wireless power transmission device
a transmitting coil for wireless power transmission with a receiving coil of a wireless power receiving device;
A mounting surface provided on the transmitter coil for mounting the wireless power receiver on a line passing through the vicinity of the center of the transmitter coil and on both sides of the transmitter coil. a placement surface having a position mark for indicating the position to place the
a control unit that acquires information data from the wireless power receiving device via the transmission coil and controls power supply to the transmission coil;
with
The wireless power receiving device
a recording unit that records the position of the receiving coil of the wireless power receiving device;
When it becomes ready to receive power from the wireless power transmission device, the receiving coil displays the position of the receiving coil on the flat display corresponding to the recorded position of the receiving coil. a position display means;
A wireless power supply system comprising: In the wireless power supply system of claim 9,
The position marks comprise at least laterally arranged position marks,
The wireless power supply system, wherein the receiving side coil position display includes a display corresponding to a vertical center line of the power receiving side coil and a display corresponding to a horizontal center line of the power receiving side coil. A wireless power receiving device capable of receiving power from a wireless power transmitting device,
a receiving coil for receiving power from a transmitting coil of a wireless power transmission device;
a recording unit that records the position of the receiving coil of the wireless power receiving device;
When it is ready to receive power from the wireless power transmission device,
power supply display control means for displaying a receiving side coil position indicating the position of the receiving side coil at a position of the flat display corresponding to the recorded position of the receiving side coil;
A wireless powered device with a In the system or device of any of claims 9-11,
A system or device, wherein the wireless power receiving device is a smart phone or a tablet computer. In the system or device of any of claims 1-12,
A system or apparatus, wherein the wireless power transmission device is a desk having a desk surface as a placement surface.

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