WO2014115215A1

WO2014115215A1 - Noncontact charger

Info

Publication number: WO2014115215A1
Application number: PCT/JP2013/007104
Authority: WO
Inventors: 北村　浩康; 真美鈴木
Original assignee: パナソニック株式会社
Priority date: 2013-01-23
Filing date: 2013-12-03
Publication date: 2014-07-31
Also published as: JP2014143813A

Abstract

A transmission coil (103) is attached to a body unit (801) so as to be able to rotate. When one device (200) is to be charged, the transmission coil (103) is positioned in a first state in which a long side (W12) of the transmission coil (103) is orthogonal to an arrangement direction (601) of the device (200). When a plurality of devices (200) are to be charged, the transmission coil (103) is positioned in a second state in which the long side (W12) of the transmission coil (103) is parallel to the arrangement direction (601).

Description

Contactless charger

The present invention relates to a non-contact charger capable of charging a plurality of devices.

Currently, electric toothbrushes that are charged by non-contact charging without electrical contacts are available from various companies. In such an electric toothbrush, a charger for charging one electric toothbrush is sold together. Since an electric toothbrush is mainly used in a washroom, it is generally stored in a washstand in a state of being set in a charger after use. However, since the storage space for the wash basin is small, for example, there are few households in which each member of a family of four purchases an electric toothbrush individually. One of the causes is the size of the charger and the number of outlets.

Therefore, a charger that can charge four electric toothbrushes at the same time is considered desirable. For example, Patent Document 1 discloses a non-contact charger that includes four coils and charges a plurality of mobile phones simultaneously.

However, it is sufficient for a single person to be able to charge one electric toothbrush. For a person living alone, a charger that can charge two or more electric toothbrushes at the same time is larger and obstructive compared to a conventional charger for one unit.

Japanese Patent Laid-Open No. 2005-006440

An object of the present invention is to provide a non-contact charger whose size can be changed according to the number of devices used.

A non-contact charger according to an aspect of the present invention is a non-contact charger capable of charging a plurality of devices, and generates a magnetic flux from a flux linkage surface, and is arranged along the magnetic flux linkage surface. A transmission coil for transmitting power is included, and the width of the transmission coil in the arrangement direction of the devices can be varied.

It is a figure which shows the washstand in which the charger by Embodiment 1 was installed. It is a block diagram of the charger and apparatus shown in FIG. It is a block diagram of a transmission coil. It is a block diagram of a receiving coil. It is sectional drawing of the vertical direction of a charger and an apparatus. It is sectional drawing from the top view of a charger and an apparatus. 1 is a circuit diagram of a charging system according to Embodiment 1. FIG. It is explanatory drawing of an effect | action of the charger of Embodiment 1. FIG. It is sectional drawing from the side view of a charger. It is the figure which showed a mode that the transmission coil rotated. In Embodiment 2, it is a figure which shows the relationship between the transmission coil in a 2nd state, and a receiving coil. In Embodiment 2, it is a figure which shows the relationship between the transmission coil in a 1st state, and a receiving coil. It is a block diagram of the charging system provided with the AC adapter. It is the figure which showed the charger by Embodiment 2. FIG. It is sectional drawing from the upper surface view of a charger. It is a figure which shows the transmission coil in the top view at the time of removing a housing. In the modification of Embodiment 2, it is a figure which shows the relationship between the transmission coil and a receiving coil when a magnetic body is positioned to a 2nd state. In the modification of Embodiment 2, it is a figure which shows the relationship between the transmission coil and a receiving coil when a magnetic body is positioned to a 1st state. FIG. 6 is a configuration diagram of a transmission coil in a third embodiment. In Embodiment 3, it is the figure which showed the transmission coil when an auxiliary member is attached to the main coil part. In Embodiment 3, it is the figure which showed the transmission coil when an auxiliary member is removed from the main coil part. It is explanatory drawing of the charger of Embodiment 4. It is a wave form diagram which shows operation | movement of the control circuit according to the magnitude of the inductance of a transmission coil. FIG. 10 is a circuit diagram of a charger according to a sixth embodiment. It is a figure which shows the example of arrangement | positioning of a sensor. It is a wave form diagram which shows operation | movement of a control circuit. FIG. 10 is a configuration diagram of a transmission coil in a seventh embodiment. FIG. 10 is a configuration diagram of a transmission coil in a seventh embodiment.

(Embodiment 1)
FIG. 1 is a diagram showing a toilet where a non-contact charger (hereinafter referred to as a charger 100) according to Embodiment 1 is installed. A charger 100 is installed on the back side of the washstand 11. The charger 100 charges the device 200 in a non-contact manner. The charger 100 includes a support portion 12 that supports a magnetic flux linkage surface that generates magnetic flux. The device 200 faces the magnetic flux linkage surface and is arranged on the wash basin 11 along the magnetic flux linkage surface. The charger 100 generates a magnetic flux toward the front side to charge the device 200. In the example of FIG. 1, two devices 200 are placed. As the device 200, any device that can be charged may be used. In the example of FIG. 2, an electric toothbrush is used. However, this is only an example, and an electric shaver, a facial device, or the like may be employed as the device 200. The charger 100 and the device 200 constitute a charging system.

FIG. 2 is a block diagram of the charger 100 and the device 200 shown in FIG. The charger 100 includes a smoothing circuit 101, an oscillation circuit 102, a transmission coil 103, and an outlet plug PG. When the outlet plug PG is connected to the outlet 21, a commercial power supply voltage is supplied to the charger 100.

Smoothing circuit 101 rectifies and smoothes the power supply voltage. The oscillation circuit 102 oscillates the rectified and smoothed power supply voltage at a predetermined frequency (for example, 400 kHz), and causes a high-frequency current to flow through the transmission coil 103. Thereby, the oscillation circuit 102 oscillates the transmission coil 103. The transmission coil 103 generates magnetic flux when high-frequency current flows, and supplies power to the device 200.

The device 200 includes a power receiving coil 201, a smoothing circuit 202, and a secondary battery 203. The power receiving coil 201 receives the magnetic flux from the transmission coil 103. The smoothing circuit 202 rectifies and smoothes the voltage generated in the power receiving coil 201. The secondary battery 203 is supplied with the voltage smoothed by the smoothing circuit 202 and stores the electric power supplied from the charger 100. As the secondary battery 203, for example, a Li ion secondary battery is employed.

FIG. 7 is a circuit diagram of the charging system according to the first embodiment. The charger 100 includes a diode bridge 701, a smoothing capacitor 702, switching elements Q1 to Q4, a coil L1, a capacitor C1, and a control circuit 704. The diode bridge 701 and the smoothing capacitor 702 constitute the smoothing circuit 101 of FIG. The switching elements Q1 to Q4 and the control circuit 704 constitute the oscillation circuit 102 of FIG. The coil L1 and the capacitor C1 constitute the transmission coil 103 in FIG.

The switching elements Q1 to Q4 are each connected to the control circuit 704 via the resistor R1.

The coil L1 and the capacitor C1 are connected in series. The coil L1 is connected between the switching elements Q1 and Q3, and the capacitor C1 is connected between the switching elements Q2 and Q4.

The control circuit 704 turns on and off the switching elements Q1 and Q4 and the switching elements Q2 and Q3 alternately, and causes a high-frequency current to flow through the coil L1 and the capacitor C1. The coil L1 generates magnetic flux by this high frequency current.

The device 200 includes a coil L2, a capacitor C2, a diode bridge 710, and a smoothing capacitor C3. The coil L2 and the capacitor C2 constitute the power receiving coil 201 in FIG. The diode bridge 710 and the smoothing capacitor C3 constitute the smoothing circuit 202 of FIG.

The voltage generated in the coil L2 is full-wave rectified by the diode bridge 710, smoothed by the smoothing capacitor C3, and converted into a DC voltage.

3 is a configuration diagram of the transmission coil 103, (A) is a front view, and (B) is a BB cross-sectional view. The transmission coil 103 has a rectangular shape when viewed from the front. The transmission coil 103 includes a winding 301 and a magnetic body 302. The winding 301 is attached to the outer peripheral region of the main surface 302a (magnetic flux linkage surface) of the magnetic body 302. The magnetic body 302 has a flat main surface 302a and a flat plate shape. The thickness t1 of the winding 301 is 2 mm, for example. The thickness t2 of the magnetic body 302 is 2 mm, for example. The permeability of the magnetic body 302 is 2300, for example.

The long side W12 of the transmission coil 103 is, for example, 70 mm, the short side W11 is, for example, 50 mm, and the thickness (t1 + t2) is, for example, 4 mm. The width t3 of the winding 301 is, for example, 10 mm. The winding 301 is formed by winding 20 conductors with a diameter of 0.06 mm, for example, 20 times.

FIG. 4 is a configuration diagram of the power receiving coil 201, (A) is a front view, and (B) is a BB cross-sectional view. The power receiving coil 201 is rectangular and includes a winding 401 and a magnetic body 402. The magnetic body 402 has a main surface 402a that is rectangular and has a flat plate shape. Winding 401 is affixed to the outer peripheral region of main surface 402a. The power receiving coil 201 has a long side W22 of, for example, 40 mm, a short side W21 of, for example, 20 mm, and a thickness t3 of, for example, 1 mm. The power receiving coil 201 is attached to the device 200 so that the short side W21 faces the horizontal direction when the device 200 is erected on the washstand 11.

The long side W12 of the transmission coil 103 has a length about four times the short side W21 of the power receiving coil 201. Therefore, the transmission coil 103 can charge up to four devices 200 arranged in a line in the horizontal direction. Here, the direction in which the devices 200 are arranged is referred to as an arrangement direction. In addition, said dimension is only an example and this invention is not limited to said dimension.

FIG. 5 is a cross-sectional view when the charger 100 and the device 200 are cut in the vertical direction. The charger 100 includes a housing 501 that houses the transmission coil 103. The housing 501 includes a main surface 501a facing the device 200 and emits a magnetic flux from the main surface 501a. The device 200 includes a housing 502 that houses the power receiving coil 201. The device 200 is arranged away from the charger 100 by a distance D1. The distance D1 is, for example, 10 mm.

FIG. 6 is a cross-sectional view of the charger 100 and the device 200 as viewed from above. In the example of FIG. 6, four devices 200 are arranged along the arrangement direction 601. In the present embodiment, the arrangement direction 601 is a direction parallel to the flux linkage surface of the transmission coil and parallel to the horizontal direction (the direction of the surface of the washbasin 11).

8A and 8B are explanatory diagrams of the operation of the charger 100 according to the first embodiment. FIG. 8A illustrates the charger 100 when charging one device 200, and FIG. 8B illustrates four devices 200. The charger 100 in the case of charging is shown.

The transmission coil 103 is connected to the main body 801 via a rotation shaft 103 a provided in the main body 801, and is rotatable with respect to the main body 801. The main body 801 is attached to the support 12 shown in FIG. 1 and includes the smoothing circuit 101 and the oscillation circuit 102 shown in FIG. The transmission coil 103 has a rotating shaft 103a attached to the center O103, for example. As a result, when the transmission coil 103 is positioned in a state where the long side W12 is parallel to the arrangement direction 601, the width of the arrangement direction 601 increases symmetrically in the transmission coil 103, so that the transmission coil 103 can be positioned in a balanced manner. it can.

FIG. 9 is a cross-sectional view of the charger 100 as viewed from the side, (A) is a cross-sectional view when the transmission coil 103 is positioned in the first state, and (B) is a cross-sectional view of the transmission coil 103 in the second state. It is sectional drawing in the case of being positioned in the state.

The transmission coil 103 is accommodated in the housing 501. A rotating shaft 103a is attached near the center of the surface of the housing 501 on the main body 801 side. Here, the housing 501 is rotatably attached to the rotation shaft 103a. The rotating shaft 103a is fixed near the center of the surface of the housing 801a of the main body 801 on the transmission coil 103 side. Therefore, the transmission coil 103 can rotate with respect to the main body 801.

When charging one device 200, the transmission coil 103 is positioned in a first state in which the long side W12 is orthogonal to the arrangement direction 601 as shown in FIG. Therefore, as shown in FIG. 9A, the long side W12 of the transmission coil 103 faces the vertical direction. Thereby, the transmission coil 103 is accommodated in the main body 801, and the empty space of the wash basin 11 is increased.

On the other hand, when charging the four devices 200, as shown in FIG. 8B, the transmission coil 103 is rotated 90 degrees, and the long side W12 is positioned in the second state parallel to the arrangement direction 601. Therefore, as shown in FIG. 9B, the transmission coil 103 has the short side W11 facing the vertical direction. Thereby, the width | variety of the arrangement direction 601 of the transmission coil 103 increases compared with the case of a 1st state. As a result, the magnetic flux emitted from the transmission coil 103 is linked to the power receiving coils 201 of the four devices 200, and the charger 100 can charge the four devices 200 simultaneously.

Also, a person who always uses only one unit can reduce the spread of the arrangement direction 601 by using the transmission coil 103 in the vertical direction (first state), compared to using four units. Can be used effectively.

10A and 10B are diagrams illustrating a state in which the transmission coil 103 rotates. FIG. 10A illustrates the transmission coil 103 from a top view, and FIG. 10B illustrates the transmission coil 103 rotating from the first state to the second state. It is the figure which showed a mode continuously, (C) is sectional drawing of the transmission coil 103. FIG. In the leftmost diagram of FIG. 10B, the transmission coil 103 is in the first state. At this time, when the transmission coil 103 is viewed from above, the transmission coil 103 does not protrude from the main body 801 as shown in the left diagram of FIG.

When the transmission coil 103 is rotated by the user, the transmission coil 103 changes from the left side to the right side in FIG. 10B, and finally becomes the second state shown at the rightmost position. At this time, when the transmission coil 103 is viewed from the top, the width of the transmission coil 103 in the arrangement direction 601 increases as shown in the right diagram of FIG.

As shown in FIG. 10C, the transmission coil 103 is accommodated in a housing 501 having a rectangular parallelepiped shape. One end 301 a and the other end 301 b of the winding 301 pass through the center hole of the magnetic body 302 and are electrically connected to the oscillation circuit 102 of the main body 801. A bypass wire 301c for guiding the winding 301 to the hole is provided at the outer end 301d of the winding 301. An insulation sheet 1001 is provided below the bypass line 301c to prevent a short circuit between the winding 301 and the bypass line 301c.

FIG. 11 is a diagram illustrating the relationship between the transmission coil 103 and the power receiving coil 201 in the second state in the second embodiment, where (A) shows only the transmission coil 103 and (B) shows only the power receiving coil 201. (C) shows the transmission coil 103 and the power receiving coil 201 in an overlapping manner.

FIG. 12 is a diagram illustrating the relationship between the transmission coil 103 and the power receiving coil 201 in the first state in the second embodiment, where (A) shows only the transmission coil 103 and (B) shows only the power receiving coil 201. (C) shows the transmission coil 103 and the power receiving coil 201 in an overlapping manner.

As shown in FIGS. 11C and 12C, the shapes of the transmission coil 103 and the power receiving coil 201 are set so that the power receiving coil 201 is within the region of the transmission coil 103 in both the second state and the first state. The height of the center O301 of the transmission coil 103 is determined.

Specifically, the height of the center O301 of the transmission coil 103 and the center O201 of the power receiving coil 201 from the wash basin 11 are substantially the same, and the short side W11 of the transmission coil 103 is approximately the same as the long side W22 of the power receiving coil 201. The long side W12 of the transmission coil 103 may be about four times as long as the short side W21 of the power receiving coil 201. As a result, the charger 100 can be charged efficiently both when charging four devices 200 and when charging one device 200.

In the first state, a gap D <b> 12 is provided between the transmission coil 103 and the washstand 11 so that the user can rotate the transmission coil 103 without lifting the charger 100 from the washstand 11. . However, this is an example, and the gap D12 may be eliminated.

In the example of FIG. 2, the smoothing circuit 101 is provided in the charger 100, but the invention is not limited thereto, and the smoothing circuit 101 may be omitted from the charger 100. In this case, as shown in FIG. 13, an AC adapter 1301 may be provided separately, and the charger 100 may be connected to an outlet via the AC adapter 1301. FIG. 13 is a configuration diagram of a charging system provided with an AC adapter 1301. The AC adapter 1301 includes the smoothing circuit 101 and the outlet plug PG shown in FIG. 2, and converts the power supply voltage of AC 100V into, for example, a DC voltage of 12V. The AC adapter 1301 and the charger 100 are connected via a cable 1302, and the oscillation circuit 102 is supplied with a DC voltage from the AC adapter 1301.

In the above description, the charger 100 has been described as being capable of charging a maximum of four devices 200, but this is only an example, and a maximum of n (two or more) such as two, three, five, etc. An integer) device 200 that can be charged may be used. In this case, the long side W12 of the transmission coil 103 may be set according to the value of n.

(Embodiment 2)
The charger 100 according to the second embodiment is characterized in that only the magnetic material is rotated to change the width of the transmission coil 103 in the arrangement direction 601. 14A and 14B are diagrams showing a charger 100 according to the second embodiment, where FIG. 14A shows the charger 100 when charging one device 200, and FIG. 14B shows charging four devices 200. FIG. The charger 100 in the case of doing is shown.

As shown in FIGS. 14A and 14B, in the present embodiment, only the magnetic body portion 3020 including the magnetic body 302 is rotatable to the main body portion 801, and the winding portion 3010 including the winding 301 is Does not rotate. When charging one device 200, as shown in FIG. 14A, the magnetic body portion 3020 is set to the first state in which the long side W12 is orthogonal to the arrangement direction 601. When charging the four devices 200, as shown in FIG. 14B, the magnetic body portion 3020 is set to the second state in which the long side W12 is parallel to the arrangement direction 601. On the other hand, the long side of the winding portion 3010 is orthogonal to the arrangement direction 601 and is fixed to the main body portion 801 even when the magnetic body portion 3020 is in the second state. In the second state, only the magnetic body portion 3020 protrudes from the winding portion 3010 toward the arrangement direction 601, but the magnetic flux is interlinked even in the protruding region. Therefore, if the device 200 is arranged in front of the protruding area, the device 200 is charged.

FIG. 15 is a cross-sectional view of the battery charger 100 as viewed from above, (A) is a cross-sectional view when the magnetic body 3020 is positioned in the first state, and (B) is a cross-sectional view of the magnetic body 3020. It is sectional drawing in the case of being positioned in a 2nd state. As shown in FIGS. 15A and 15B, the magnetic body 302 is housed in a housing 3020 a of the magnetic body portion 3020. Winding 301 is also housed in housing 3010 a of winding portion 3010. The housing 3010a and the housing 801a of the main body 801 are connected by a rotating shaft 103a. Here, since the housing 3010a and the housing 801a are fixed, the winding 301 does not rotate with respect to the main body 801.

The housing 3020a has a hole in the center, and the rotation shaft 103a passes through the hole, so that the housing 3020a can rotate with respect to the housing 801a. Therefore, the magnetic body 302 can rotate with respect to the main body 801. In the first state, as shown in FIG. 15A, the magnetic body portion 3020 does not protrude from the main body portion 801 toward the arrangement direction 601. On the other hand, in the second state, as shown in FIG. 15B, the magnetic body portion 3020 protrudes from the main body portion 801 in the arrangement direction 601 and the width in the arrangement direction 601 increases.

16A and 16B are diagrams showing the transmission coil 103 in a top view when the housing is removed. FIG. 16A shows a case where the magnetic body 302 is positioned in the first state, and FIG. The case where it positions to the 2nd state is shown. As shown in FIG. 16B, it can be seen that when the magnetic body 302 is brought into the second state, the width in the arrangement direction 601 of the magnetic bodies 302 is increased as compared with the case of FIG. .

In the charger 100 of the second embodiment, since only the magnetic body 302 is rotated with respect to the main body 801, disconnection failure due to bending of the winding 301 can be prevented. In particular, when the size of the magnetic body 302 is larger than that of the winding 301, the effect of this embodiment is great.

Next, a modification of the second embodiment will be described with reference to FIGS. FIG. 17 is a diagram illustrating a relationship between the transmission coil 103 and the power receiving coil 201 when the magnetic body 302 is positioned in the second state in the modification of the second embodiment. FIG. 17A illustrates only the transmission coil 103. (B) shows only the receiving coil 201, and (C) shows a state in which the receiving coil 201 is arranged in front of the transmission coil 103.

FIG. 18 is a diagram illustrating a relationship between the transmission coil 103 and the power receiving coil 201 when the magnetic body 302 is positioned in the first state in the modification of the second embodiment. FIG. 18A illustrates only the transmission coil 103. (B) shows only the receiving coil 201, and (C) shows a state in which the receiving coil 201 is arranged in front of the transmission coil 103.

In the example of FIGS. 14A and 14B, the long side of the winding 301 is orthogonal to the arrangement direction 601. However, in the modification shown in FIGS. 17 and 18, the long side of the winding 301 is the arrangement direction 601. And parallel. 14A and 14B, the areas of the magnetic flux linkage surfaces of the winding 301 and the magnetic body 302 are almost the same. However, in the modified examples shown in FIGS. The area of the magnetic flux linkage surface of 302 is larger than the area of the magnetic flux linkage surface of the winding 301.

When charging one device 200, the user positions the magnetic body 302 in a first state in which the long side W12 of the magnetic body 302 is orthogonal to the arrangement direction 601 as shown in FIG. Thereby, the magnetic body 302 does not protrude from the main body 801 in the arrangement direction 601, and an empty space of the wash basin 11 can be secured.

On the other hand, when charging the four devices 200, the user positions the magnetic body 302 in the first state in which the long side W12 of the magnetic body 302 is parallel to the arrangement direction 601 as shown in FIG. Accordingly, the magnetic body 302 faces the power receiving coils 201 of the four devices 200 arranged in the arrangement direction 601. Therefore, the magnetic flux emitted from the magnetic body 302 can be linked to the power receiving coils 201 of the four devices 200, and the four devices 200 are charged.

In the modification shown in FIGS. 17 and 18, the shape of the magnetic body 302 and the power receiving coil 201 and the magnetic body so that the power receiving coil 201 is within the area of the magnetic body 302 in both the second state and the first state. 302 and the height of the power receiving coil 201 from the washstand 11 are determined.

Specifically, the height from the wash basin 11 of the center O301 of the transmission coil 103 and the center O201 of the power receiving coil 201 as the rotation axis of the magnetic body 302 is made substantially the same, and the short side W11 of the magnetic body 302 is set to the power receiving coil. If the length is equal to or longer than the long side W22 of 201, and the long side W12 of the magnetic body 302 is equal to or longer than four times the short side W21 of the receiving coil 201, the length is increased. Good.

(Embodiment 3)
The charger 100 according to the third embodiment is characterized in that the transmission coil 103 includes a main coil portion 191 and a pair of auxiliary members 192 that can be attached to and detached from the main coil portion 191. In the present embodiment, the same elements as those in the first and second embodiments are not described. FIG. 19 is a configuration diagram of the transmission coil 103 according to the third embodiment. The main coil portion 191 has grooves 1911 formed on the left and right side surfaces. The auxiliary member 192 has a convex portion 1921 on one side surface. Therefore, the auxiliary member 192 is attached to the main coil portion 191 by fitting the convex portion 1921 into the groove 1911.

The main coil portion 191 includes a flat magnetic body 302 and a winding 301 attached to the main surface of the magnetic body 302. A main body portion 801 is attached to the back surface of the main coil portion 191. The auxiliary member 192 includes a flat magnetic body 1922. The main surface of the magnetic body 1922 is disposed on the auxiliary member 192 so as to be aligned with the main surface of the magnetic body 302 when the auxiliary member 192 is attached to the main coil portion 191.

20A and 20B are diagrams showing the transmission coil 103 when the auxiliary member 192 is attached to the main coil portion 191 in the third embodiment. FIG. 20A shows only the transmission coil 103, and FIG. Only the coil 201 is shown, and (C) shows a state in which four devices 200 are placed in front of the transmission coil 103.

The width W31 in the arrangement direction 601 of the magnetic bodies 302 is about twice the short side W21 of the power receiving coil 201. The vertical width W32 of the magnetic body 302 is approximately the same as the long side W22 of the power receiving coil 201. The horizontal width W41 of the magnetic body 1922 is slightly larger than the short side W21 of the power receiving coil 201. The vertical width W42 of the magnetic body 1922 is approximately the same as the width W32.

When charging four devices 200, the user attaches a pair of auxiliary members 192 to the main coil portion 191. Thereby, the width | variety of the arrangement direction 601 of the transmission coil 103 becomes long. The magnetic body 1922 is magnetically coupled to the magnetic body 302 and emits a magnetic flux toward the device 200. Therefore, magnetic flux is also supplied to the devices 200 placed at both ends of the arrangement direction 601, and the four devices 200 can be charged simultaneously.

FIG. 21 is a diagram illustrating the transmission coil 103 when the auxiliary member 192 is removed from the main coil portion 191 in the third embodiment, where (A) illustrates only the transmission coil 103 and (B) illustrates power reception. Only the coil 201 is shown, and (C) shows a state in which one device 200 is placed in front of the transmission coil 103.

When charging one device 200, the user removes the auxiliary member 192 from the main coil portion 191. Thereby, the width | variety of the arrangement direction 601 of the transmission coil 103 becomes short, and the empty space of the washstand 11 can be ensured. In addition, what is necessary is just to attach the one auxiliary member 192 to the main coil part 191 when charging the three apparatuses 200. FIG.

(Embodiment 4)
The fourth embodiment is characterized in that, in the charger 100 of the second embodiment, the short side W11 of the magnetic body 302 is adjusted so that the change in inductance of the transmission coil 103 is minimized before and after the magnetic body 302 is rotated. And FIG. 22 is an explanatory diagram of the charger 100 according to the fourth embodiment. As shown in FIGS. 14A and 14B, when the magnetic body 302 is changed from the first state to the second state, the area S1 of the magnetic body 302 that is behind the winding 301 disappears, and the inductance is reduced. . The long sides of the magnetic body 302 and the winding 301 are the same.

However, when the magnetic body 302 is changed from the first state to the second state, a region S2 that protrudes from the winding 301 in the arrangement direction 601 is generated, so that the inductance increases by this region S2.

Therefore, if the areas of the region S1 and the region S2 are the same, a decrease in inductance when the state is changed from the first state to the second state can be minimized. However, even if the areas of the region S1 and the region S2 are the same, the region S2 does not have the winding 301, so that the inductance of the transmission coil 103 in the second state is slightly lower than that in the first state.

Therefore, the control of the oscillation circuit 102 is not changed by designing the short side W11 so that the inductance is substantially the same between the case where the magnetic body 302 is located in the first state and the case where the magnetic body 302 is located in the second state. However, the device 200 can be charged without any problem.

(Embodiment 5)
In the fifth embodiment, in the second embodiment, when the magnetic body 302 is positioned in the second state, the magnetic body 302 has a smaller inductance than the case where the magnetic body 302 is positioned in the first state. The short side W11 is set.

As shown in FIG. 22, when the short side W11 of the magnetic body 302 is made shorter than the short side W51 of the winding 301, the area of the region S2 is lower than the area of the region S1, and the inductance of the transmission coil 103 is reduced. Therefore, in the present embodiment, the short side W11 of the magnetic body 302 is made shorter than the short side W51 of the winding 301. Thereby, when the magnetic body 302 is positioned in the second state, the inductance of the transmission coil 103 can be reduced as compared with the case where the magnetic body 302 is positioned in the first state.

FIG. 23 is a waveform diagram showing the operation of the control circuit 704 according to the magnitude of the inductance of the transmission coil 103, where (A) shows a case where the inductance is small and (B) shows a case where the inductance is large. In FIGS. 23A and 23B, the upper stage is a waveform diagram of the gate voltage applied by the control circuit 704 to the gates of the switching elements Q1 and Q4, and the middle stage is applied by the control circuit 704 to the gates of the switching elements Q2 and Q3. The lower part is a waveform diagram of the current flowing through the transmission coil 103. Hereinafter, description will be made with reference to FIGS.

When the magnetic body 302 is positioned in the second state, as shown in FIG. 23A, the inductance of the transmission coil 103 is reduced, so that the current flowing through the transmission coil 103 when the switching elements Q1 to Q4 are turned on is reduced. Rise time is faster. As a result, the energy stored in the transmission coil 103 increases, and the amplitude of the current flowing through the transmission coil 103 increases. Therefore, the power supplied to the device 200 can be increased.

On the other hand, when the magnetic body 302 is positioned in the first state, as shown in FIG. 23B, the inductance is reduced, so that the amplitude of the current flowing through the transmission coil 103 is reduced, and the power supplied to the device 200 is reduced. Decrease.

As described above, in the fifth embodiment, the inductance of the transmission coil 103 becomes smaller when positioned in the second state than when positioned in the first state. Therefore, the control circuit 704 increases the power supplied to the device 200 in the second state than in the first state without changing the control of the switching elements Q1 to Q4 between the first state and the second state. Can do.

(Embodiment 6)
The sixth embodiment is characterized by providing a sensor, detecting whether the transmission coil 103 is in the first state or the second state, and changing the control to the switching elements Q1 to Q4.

FIG. 24 is a circuit diagram of charger 100 according to the sixth embodiment. In FIG. 24, a sensor 231 is added to FIG. As the sensor 231, for example, a hall sensor is employed. FIG. 25 is a diagram illustrating an arrangement example of the sensor 231. FIG. 25A illustrates a case where the transmission coil 103 is positioned in the first state, and FIG. 25B illustrates that the transmission coil 103 is positioned in the second state. Indicates the case.

25A, the sensor 231 is disposed on the left side of the main surface of the main body 801. Specifically, the sensor 231 is disposed at a position that is not shielded by the transmission coil 103 when the transmission coil 103 is positioned in the first state. More specifically, the transmission coil 103 is arranged on the left side in the arrangement direction 601 with respect to the center O103 of the transmission coil 103 at a position slightly apart from the half of the short side W11 of the transmission coil 103.

Therefore, when the transmission coil 103 is positioned in the first state, the sensor 231 is not significantly affected by the magnetic flux because there is no transmission coil 103 directly above the sensor 231.

On the other hand, when the transmission coil 103 is positioned in the second state, the sensor 231 is shielded by the transmission coil 103 as shown in FIG. For this reason, since the transmission coil 103 is located directly above the sensor 231, the sensor 231 receives more magnetic flux than in the first state.

Thereby, the sensor 231 can detect whether the transmission coil 103 is in the first state or the second state.

26A and 26B are waveform diagrams showing the operation of the control circuit 704. FIG. 26A shows the case where the transmission coil 103 is positioned in the first state, and FIG. 26B shows the case where the transmission coil 103 is positioned in the second state. Show the case. 26A and 26B, the upper stage is a waveform diagram of the gate voltage applied by the control circuit 704 to the gates of the switching elements Q1 and Q4, and the middle stage is applied by the control circuit 704 to the gates of the switching elements Q2 and Q3. The lower part is a waveform diagram of the current flowing through the transmission coil 103.

As shown in FIGS. 26A and 26B, the off period of the gate voltage is the same when the transmission coil 103 is in the first state and the second state.

On the other hand, when the sensor 231 detects that the transmission coil 103 is in the second state from the first state, the control circuit 704 lowers the frequency of the gate voltage compared to the first state, thereby turning on the duty of the gate voltage. To increase. On the other hand, when the sensor 231 detects that the transmission coil 103 is in the first state, the control circuit 704 raises the frequency of the gate voltage and lowers the on-duty of the gate voltage compared to the second state.

Thereby, when charging four devices 200, it is possible to increase the power supplied to the device 200 as compared to charging one device 200.

(Embodiment 7)
The seventh embodiment is characterized in that a resonance circuit is employed as the auxiliary member 192 in the third embodiment. 27 and 28 are configuration diagrams of the transmission coil 103 according to the seventh embodiment. The transmission coil 103 includes a main coil portion 261 and a pair of auxiliary members 262 as in the third embodiment. The auxiliary member 262 can be attached to and detached from the main coil portion 261 as in the third embodiment. As shown in FIG. 28, the main coil portion 261 is the same as that in the third embodiment.

The auxiliary member 262 includes a resonance circuit 2625. The resonance circuit 2625 includes a magnetic body 2622, a winding 2623, and a capacitor 2624.

The magnetic body 2622 has a flat plate shape. A winding 2623 is attached to the main surface of the magnetic body 2622. A capacitor 2624 is electrically connected to the winding 2623. The resonance frequency of the resonance circuit 2625 is set to a value close to the resonance frequency of the main coil portion 261.

When the auxiliary member 262 is attached to the main coil portion 261, the resonance circuit 2625 resonates by magnetic coupling with the main coil portion 261 to generate magnetic flux. That is, the resonance circuit 2625 is not electrically connected to the main coil portion 261 but is magnetically coupled to the main coil portion 261 to generate a magnetic flux.

When charging four devices 200, the user attaches a pair of auxiliary members 262 to the main coil portion 261. Thereby, the width | variety of the arrangement direction 601 of the transmission coil 103 becomes long. Then, the resonance circuit 2625 resonates with the main coil portion and emits a magnetic flux toward the device 200. Therefore, magnetic flux is also supplied to the devices 200 placed at both ends of the arrangement direction 601, and the four devices 200 can be charged simultaneously.

On the other hand, when charging one device 200, the user removes the auxiliary member 262 from the main coil portion 261. Thereby, the width | variety of the arrangement direction 601 of the transmission coil 103 becomes short, and the empty space of the washstand 11 can be ensured. In addition, what is necessary is just to attach the one auxiliary member 262 to the main coil part 261, when charging the three apparatuses 200. FIG. Note that the sensor 231 described in Embodiment 6 may be provided in Embodiment 7. In this case, a sensor 231 that is turned on when the auxiliary member 262 is attached and turned off when the auxiliary member 262 is removed may be provided in each of the pair of grooves 2611 of the main coil portion 2611. And the control circuit 704 should just produce | generate a gate voltage so that an on-duty may become high compared with the case where the two auxiliary members 262 are attached compared with the case where the one auxiliary member 262 is attached. In addition, when the auxiliary member 262 is not attached, the control circuit 704 may generate the gate voltage so that the on-duty is higher than when the auxiliary member 262 is attached. This embodiment using the sensor 231 can also be applied to the third embodiment.

(Summary of this embodiment)
(1) The non-contact charger according to the present embodiment is a non-contact charger capable of charging a plurality of devices, generates a magnetic flux from a magnetic flux linkage surface, and is arranged along the magnetic flux linkage surface. A transmission coil that transmits power to the device is included, and the width of the transmission coil in the arrangement direction of the device can be varied.

According to this configuration, the width of the transmission coil is adjusted to a size corresponding to the number of devices to be charged. Therefore, a user who charges only one device can charge the device by shortening the width of the transmission coil, and can secure an empty space in the washstand. On the other hand, a user who charges a plurality of devices can increase the width of the transmission coil and charge the plurality of devices simultaneously.

(2) The transmission coil further includes a main body portion in which the magnetic flux linkage surface is rectangular and the transmission coil is rotatably attached, and the transmission coil rotates with respect to the main body portion, It is preferable that the width in the arrangement direction varies.

According to this configuration, the transmission coil has a rectangular shape and is rotatably attached to the main body. Therefore, the user can increase the width of the transmission coil in the arrangement direction by rotating the transmission coil so that the long side of the transmission coil is directed in the arrangement direction. On the other hand, the user can reduce the width of the transmission coil in the arrangement direction by rotating the transmission coil so that the long side of the transmission coil is directed in a direction orthogonal to the arrangement direction.

(3) The transmission coil is preferably rotatable from a first state in which a longitudinal direction is orthogonal to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction.

According to this configuration, when charging one device, the user positions two transmission coils in the first state, and when charging a plurality of devices, the user positions two transmission coils in the second state. The device can be charged by switching the state.

(4) It is preferable that the transmission coil includes a magnetic body portion and a winding portion, and only the magnetic body portion rotates with respect to the main body portion.

According to this configuration, the width of the transmission coil is adjusted by rotating only the magnetic body portion constituting the transmission coil. Therefore, it is possible to prevent problems such as wire breakage.

(5) The magnetic body portion is rotatable from a first state in which a longitudinal direction is perpendicular to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction. It is preferable that the short side is set so that a change in inductance is suppressed between the state and the second state.

According to this configuration, since the decrease in the inductance of the transmission coil is suppressed before and after switching between the first state and the second state, even if the control of the oscillation circuit is not switched between the first state and the second state, Approximately the same amount of power can be supplied to the device.

(6) The magnetic body portion is rotatable from a first state in which a longitudinal direction is orthogonal to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction, It is preferable that the short side is set so that the inductance is smaller when positioned in the state than when positioned in the first state.

According to this configuration, when switching from the first state to the second state, the inductance of the transmission coil becomes small, so even if the control of the oscillation circuit is not switched between the first state and the second state, In this case, the power supply amount can be increased as compared with the case of the first state.

(7) It is preferable that the transmission coil includes a main coil part and an auxiliary member magnetically coupled to the main coil part, and the auxiliary member is detachable from the main coil part in the arrangement direction. .

According to this configuration, the width of the transmission coil can be adjusted by attaching / detaching the auxiliary member to / from the main coil portion.

(8) The auxiliary member is preferably made of a magnetic material.

According to this configuration, since the auxiliary member is made of a magnetic material, when the auxiliary member is attached to the main coil portion, the magnetic material is magnetically coupled to the main coil portion, and magnetic flux can be generated from the auxiliary member. Therefore, it is possible to generate magnetic flux from the auxiliary member without electrically connecting the auxiliary member and the main coil portion using the conductive wire.

(9) The auxiliary member is preferably constituted by a resonance circuit including a coil and a capacitor.

According to this configuration, since the auxiliary member is configured by the resonance circuit, when the auxiliary member is attached to the main coil portion, the coil of the resonance circuit is magnetically coupled to the main coil portion, and magnetic flux is generated from the auxiliary member. it can. Therefore, it is possible to generate magnetic flux from the auxiliary member without electrically connecting the auxiliary member and the main coil portion using the conductive wire.

(10) The sensor further includes a sensor that detects that the width of the transmission coil in the arrangement direction is a second size longer than the first size, and an oscillation circuit that oscillates the transmission coil. When the sensor detects that the width of the transmission coils in the arrangement direction is the second size, it is preferable that the current flowing in the transmission coil is increased as compared with the case of the first size.

According to this configuration, when charging a plurality of devices, the amount of power supplied to the devices can be increased.

The present invention is useful for devices such as an electric shaver and an electric toothbrush because the width of the transmission coil can be adjusted according to the number of devices to be charged.

Claims

A non-contact charger that can charge multiple devices,
Including a transmission coil that generates magnetic flux from the magnetic flux linkage surface and transmits power to devices arranged along the magnetic flux linkage surface,
The transmission coil is a non-contact charger whose width in the arrangement direction of the devices is variable.
The transmission coil has a rectangular magnetic flux linkage surface,
The transmission coil further includes a main body portion rotatably attached,
The non-contact charger according to claim 1, wherein the transmission coil rotates with respect to the main body to change a width in the arrangement direction.
The contactless charging according to claim 2, wherein the transmission coil is rotatable from a first state in which a longitudinal direction is orthogonal to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction. vessel.
4. The non-contact charger according to claim 2, wherein the transmission coil includes a magnetic part and a winding part, and only the magnetic part rotates with respect to the main body part.
The magnetic body portion is rotatable from a first state in which a longitudinal direction is orthogonal to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction, and the first state and the The non-contact charger according to claim 4, wherein a short side is set so that a change in inductance is suppressed in the second state.
The magnetic body portion is rotatable from a first state in which a longitudinal direction is orthogonal to the arrangement direction to a second state in which the longitudinal direction is parallel to the arrangement direction, and is positioned in the second state. The non-contact charger according to claim 4, wherein the short side is set so that the inductance is smaller than that in the case of being positioned in the first state.
The transmission coil includes a main coil part and an auxiliary member magnetically coupled to the main coil part,
The non-contact charger according to claim 1, wherein the auxiliary member is detachable from the main coil portion in the arrangement direction.
The non-contact charger according to claim 7, wherein the auxiliary member is made of a magnetic material.
The non-contact charger according to claim 7, wherein the auxiliary member is constituted by a resonance circuit including a coil and a capacitor.
A sensor for detecting that the width in the arrangement direction of the transmission coils is a second size longer than the first size;
An oscillation circuit for oscillating the transmission coil;
The oscillation circuit increases the current flowing through the transmission coil when the sensor detects that the width of the arrangement direction of the transmission coils has reached the second size compared to the case of the first size. The non-contact charger according to any one of claims 1 to 9.