JPH0775257A - Non-contact power supplying apparatus - Google Patents

Abstract

PURPOSE:To prevent an accident which generates heat due to a current flowing through a metallic material which is carelessly placed on a charging board and also prevent charging under the condition that a thin metallic material such as a blade for shaving is being held. CONSTITUTION:Lead switches 16, 16a are provided at the internal wall side of engaging projections 10, 10a formed at the upper surface of a charging board 8 and a ring type engaging projection 9 is formed at the position corresponding to an induction coil 15. Moreover, at the lower surface of cabinet of a television receiver 1, the magnets 14, 14a are respectively fixed to the head portions of the internal wall side of the engagement receiving recessed portions 7, 7a formed for engagement with the engaging projection 10 and a ring type engaging recessed portion 6 which engages with the ring type engaging projection 9 is formed at the position corresponding to a receptor coil 12 to form a non- contact power supply apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention utilizes electromagnetic induction by a coil to supply electric power to a device placed particularly in a place with a lot of water and charge a rechargeable battery mounted on the device side. The present invention relates to a non-contact power supply device that is sometimes suitable.

[0002]

2. Description of the Related Art In electronic equipment used in, for example, a bathroom or kitchen, if the charging terminal is exposed to the outside, contact failure or danger due to rust is involved. Therefore, there is known a contactless charging device that can perform charging using electromagnetic induction by a coil or the like without providing a charging contact for connecting a charger and an electronic device. The cross-sectional view of FIG. 10 shows an example of such a contactless charging device, and shows a state in which the device body 30 is arranged on the charging stand 31 in an enlarged manner from the front. As shown in this figure, a passive coil 30a is disposed on the inner wall side of the lower part of the housing of the device body 31, and this passive coil 30a is connected to a power supply unit 30b that is equipped with a rechargeable battery in the device circuit unit 30c. Has been done. An engaging recess 30d is formed in the lower part of the housing so as to be fitted into the core of the passive coil 30a. An induction coil 31a is arranged on the inner wall side of the upper surface of the housing of the charging stand 31,
Commercial power is supplied to the induction coil 31a through a power cord 32. In addition, the engaging projection 31 is provided on the upper surface of the housing where the core of the induction coil 31a is located.
b is formed.

Then, as shown in the figure, the device body 30 is set at a predetermined position on the upper surface of the charging stand 31. At this time, the engaging convex portion 31b is brought into engagement with the engaging concave portion 30d, whereby the device body 30 is positioned with respect to the charging stand 31. At this time, the induction coil 31a
The passive coil 30a is in a state of being coupled (coupling) with each other by electromagnetic induction though the device main body 30 and the housing of the charging stand 31 are interposed. In this state, when an alternating current of a commercial power source is passed through the induction coil 31a, the magnetic force line G generated from the induction coil 31a by electromagnetic induction causes the induction coil 31a and the passive coil 30a to move as shown in FIG.
Form a magnetic field between them. This magnetic field causes the passive coil 30
An alternating voltage is generated at a, and this energy is supplied to the power supply unit 30b, so that for example, the power supply unit 30b
The rechargeable battery inside will be charged. Alternatively, the electric power can drive the device. By configuring the charging stand 31 and the device body 30 in this manner, it is not necessary to provide terminals for passing the charging current on the respective housing surface portions of the charging stand 31 and the device body 30. Therefore, for example, a waterproof structure can be easily obtained by making the metal parts of the charger and the device not to be exposed and making the case in a state similar to that of the case molded with resin or the like. It can be used for various devices that are supposed to be used in.

[0004]

However, in the charging device having the structure as shown in FIG. 10, for example, the charging stand 3
If some metal is placed on the upper surface near the position where the induction coil 31a of No. 1 is located, current will flow through the induction coil 31a when the power cord 32 is connected to an external outlet or the like. The electromagnetic induction of the coil 31a causes a problem that an overcurrent flows through the metal and heats it, which may cause an accident. Alternatively, if a device other than the one corresponding to this charging stand is placed on the charging stand, an electric current similarly flows through the metal parts of these devices, which may cause damage to the device. is there. In particular, in the structure of the device as shown in FIG. 10, during charging, the device main body 30 is simply positioned and mounted on the charging stand 31 by one engaging portion. Therefore, for example, when the user mistakenly inserts a very thin metal piece such as the blade R of a razor to set the device body 30 on the charging stand 31, as shown in FIG. It is very difficult to detect that it is caught, and if it is charged as it is, there is a possibility that it will not be charged properly. Be in a dangerous state. As described above, when a device other than a specific device or some object (especially metal) is placed on the upper part of the charging stand, there is a problem in that there is a possibility of causing some accident.

[0005]

Therefore, in order to solve the above-mentioned problems, the present invention arranges an induction coil provided on the feeder side and a passive coil provided on the equipment main body side in close proximity to each other. According to the non-contact power supply device in which electric power is supplied to the device main body side by electromagnetic induction, a reed switch connected in series with an induction coil is provided inside the feeder, and the device main body part is provided. ,
A magnet for operating the reed switch is provided at a position corresponding to the reed switch when it is loaded in the feeder. In addition, two or more reed switches connected in series to the induction coil are provided inside the feeder, and the respective positions corresponding to the two or more reed switches when the apparatus body is mounted in the feeder. It was decided to install a magnet on. In addition, a protrusion is formed on the housing of the feeder, and the reed switch is arranged on the inner wall side of the protrusion. Furthermore, when the device body is loaded into the feeder, the respective facing surfaces of the housing of the feeder and the housing of the device body are formed in a concavo-convex shape over a predetermined range, This uneven surface shape is formed at least over a range corresponding to the positions where the induction coil and the passive coil are arranged.

[0006]

[Operation] A reed switch that operates by magnetic force with respect to the feeder (charger) is provided between the power supply and the induction coil, and a magnet that operates this reed switch is provided on the main body of the equipment, so that the feeder can be used for other equipment. Even if a metal piece is placed, the malfunction that the current flows through the induction coil does not occur. Then, by providing a convex portion on a part of the housing of the feeder and disposing the reed switch in the convex portion, an object (particularly an object having magnetic force) is placed at a position above the reed switch of the housing of the feeder. It is possible to prevent being cut. Further, by providing a plurality of reed switches and magnets, it is possible to further reduce the possibility of malfunction of the feeder. Further, in the casings of the feeder and the device main body, the concavo-convex shapes for engaging with each other are formed over a certain range on the surfaces on which the coils are arranged, so that the feeder and the device main body Even if a foreign substance, especially a thin metal piece, is sandwiched between them, the user can easily know this from the degree of engagement of the concave and convex shapes.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As one embodiment of the power supply device of the present invention, a relatively small television receiver which can be driven by a built-in rechargeable battery is used as a device main body section, and charging corresponding to this television receiver is given below. A system consisting of a stand will be described. FIG. 1A is a perspective view showing the external appearance of a television receiver and its charging base according to an embodiment of the present invention. Reference numeral 1 is a television receiver, the casing of which is made of, for example, resin. Reference numeral 2 provided on the front surface of the television receiver 1 is a display screen by a liquid crystal display, 3 is a power switch, 4 is a key operation unit for performing operations such as channel switching and volume adjustment, and 5 is an antenna. The antenna 5 is in a state of being covered with resin, for example. Also,
The bottom surface of the casing of the television receiver 1 is shown in FIG.
As shown in FIG. 3, for example, a plurality of ring-shaped engaging recesses 6 are stacked and integrally molded with the housing, and a substantially hemispherical projection receiving recess 7 is formed. In this television receiver 1, the metal parts such as terminals are not exposed at all in this case, and the entire body from the antenna to the antenna 5 is covered with a resin-molded casing so that there is no gap. It has a so-called waterproof structure.

Reference numeral 8 is a charging stand, and this housing is also made of resin or the like. A plurality of ring-shaped engaging projections 9 are superposed on the upper surface of the housing of the charging stand 8 and integrally molded with the housing, and substantially hemispherical engaging projections 10 are formed. . 11 is a main power switch,
8a is a power cord. The main body of the charging base 8 is also completely covered with the resin-molded casing,
It has a waterproof structure with no exposed metal parts or gaps.

FIG. 2 shows a television receiver 1 and a charging stand 8
2 conceptually shows the internal structure relating to the charging function, and shows the casing of the television receiver 1 and the charging base 8 in a cross section from the front direction. On the lower surface of the casing of the television receiver 1 shown in the figure, a passive coil 12 is arranged and fixed on the inner wall side of the position where the ring-shaped engaging recess 6 is formed. It is connected to a power supply unit 13 configured by a rechargeable battery or the like in the circuit unit 1a. Further, a magnet 14 for turning on the reed switch is provided at the apex portion on the inner wall side of the projection receiving recess 7 as described later.

Further, in the charging stand 8, an induction coil 15 is arranged and fixed to the inner wall portion of the upper surface of the housing at the position where the ring-shaped engaging convex portion 9 is formed, and is similarly formed on the upper surface of the housing. A reed switch 16 that is turned on / off by a magnetic force is arranged and fixed to the inner wall portion of the engagement protrusion 10.
Then, as shown in the figure, the induction coil 15 and the reed switch 1
6 and the main power switch 11 are connected in series to the power cord. Therefore, the charging stand 8 is configured so that power is not supplied to the induction coil 15 unless the reed switch 16 is turned on even when the power switch 11 is turned on. For example, when a component such as a micro switch that requires a pressing operation is used instead of the reed switch 16, it is necessary to project a portion corresponding to the pressing operation portion of the switch to the outside of the housing, and the housing has a waterproof structure. It is very difficult to do this, and if an object is placed on the top of the microswitch, the switch may inadvertently operate, but the reed switch is not directly pressed. Thus, the waterproof structure can be easily obtained because it is operated by the magnetic force of the magnet 14 through the housing. Further, as described later, the possibility of malfunction of the switch can be reduced.

When the user charges the battery, the television receiver 1 is loaded on the upper surface of the charging stand 8 and then the power switch 11 of the charging stand 8 is turned on. When the television receiver 1 is loaded in the proper position and direction, as shown in the sectional view of FIG.
The ring-shaped engaging concave portion 6 and the ring-shaped engaging convex portion 9 engage with each other, and the projection receiving concave portion 7 and the engaging protrusion 10 engage with each other. By forming such engaging portions, when the television receiver 1 is not loaded in the proper position and direction with respect to the charging base 8, since these engaging portions do not engage with each other, The user can smoothly load the television receiver 1 at an appropriate position. At this time, the induction coil 15 and the passive coil 12 are in a state of being coupled via the housing of the television receiver 1 and the charging base 8 (a state of being coupled by electromagnetic induction).

In this way, when the television receiver 1 is properly mounted on the charging stand 8 in the state shown in FIG. 3, the reed switch 16 is turned on by the magnetic force of the magnet 14 and an alternating current is applied to the induction coil 15. A magnetic field is generated by flowing and electromagnetic induction. As a result, a current flows through the passive coil 12 coupled to the induction coil 15, and this energy is supplied to the power supply unit having the rechargeable battery. In this way, charging from the charging stand 8 to the television receiver 1 side is performed without contact.

Further, in this embodiment, when the television receiver 1 is loaded in the proper position of the charging base 8, the coupling between the induction coil 15 and the passive coil 12 is optimized, that is, the power transmission. The positional relationship between the two is set so that is the most efficient. Further, the positions of the reed switch 16 and the magnet 14 and the magnetic force of the magnet 14 are set so that the reed switch 16 is turned on only when the projection receiving recess 7 and the engagement projection 10 are properly engaged. . Therefore, the television receiver 1 is not loaded in the proper position on the charging base 8, that is, the ring-shaped engaging concave portion 6 and the ring-shaped engaging convex portion 9 and the projection receiving concave portion 7 and the engaging protrusion 10 are engaged. Is not obtained and the coupling between the induction coil 15 and the passive coil 12 is not proper, the reed switch 16 does not turn on, so that an electric current may flow into the induction coil 15 of the charging base 8 carelessly. You can prevent things from happening.

Further, as shown in the sectional view of FIG. 4, the ring-shaped engaging recess 6 in which the induction coil 15 and the passive coil 12 are located.
With the thin metal piece such as the blade R of the razor sandwiched between the ring-shaped engaging convex portion 9 and the ring-shaped engaging convex portion 9, the user receives the television receiver 1
When the user tries to set the battery on the charging stand 8, the engagement between the ring-shaped engaging concave portion 6 and the ring-shaped engaging convex portion 9 cannot be obtained, so that the user can easily detect the presence of foreign matter. Further, in such a case, as shown in the figure, a certain amount of clearance is generated between the lower surface of the television receiver 1 and the upper surface of the charging base 8.
Since the engagement of 0 is not obtained and the reed switch 16 is not turned on, the charging is not started even if the main power switch 11 is turned on. In particular, in the case of the present embodiment, a plurality of ring-shaped engaging concave portions 6 and ring-shaped engaging convex portions 9 are formed not only at one place but also at positions corresponding to the induction coil 15 and the passive coil 12 over a certain area. Therefore, it is possible to prevent the inconvenience that the user starts charging without knowing the foreign matter at least when the foreign matter is sandwiched between the induction coil 15 and the passive coil 12.

Further, in the state where the television receiver 1 is not mounted on the charging stand 8, even if another device or something such as metal is left on the charging stand 8, the magnet Since the reed switch 16 does not turn on unless the action works, no current flows through the induction coil 15 even if the main power switch 11 is turned on, which may destroy other equipment or cause metal to break. There is no fever. Also, the reed switch 1
It is conceivable that something having some magnetic force may be placed on the position corresponding to the upper part of 6, but in the present embodiment, since the reed switch 16 is arranged on the inner wall side of the engaging projection 10, Even if something is placed on the protrusion 10, it will fall around the engaging protrusion 10 as shown in FIG. 5, and the reed switch 16 will not be turned on. That is, the engaging protrusion 10 is formed for the purpose of positioning and preventing malfunction of the reed switch 16.

FIG. 6 is a sectional view showing another embodiment. The same parts as those in FIG. In this embodiment, a reed switch 16a is further connected to the charging stand 8 as shown in the figure. And the charging stand 8
An engaging protrusion 10a is formed on the upper surface of the casing of the casing, and a reed switch 16a is arranged and fixed on the inner wall side of the engaging protrusion 10a. Correspondingly, on the television receiver 1 side, a projection receiving recess 7a for engaging with the engaging projection 10a.
Is formed, and a magnet 14a for turning on the reed switch 16a is fixedly arranged at the apex on the inner wall side of the projection receiving recess 7a. With such a configuration, on the charging stand 8 side, the current is not supplied to the induction coil unless both of the reed switches 16 and 16a conduct. Therefore, for example, even if an object having a magnetic force such as a magnet is erroneously placed on the upper portion of the charging base 8, the engaging projection 1 on which both the reed switches 16 and 16a are located.
The induction coil 15 will not operate unless a magnet or the like is placed at the same time near the upper portions of 0 and 10a, which may cause the malfunction of the charging stand 8 as compared with the case where the reed switch is provided at only one place. It can be further lowered.
It should be noted that the engaging protrusion 10 on the upper part of the reed switch 16a
Also, a has the same effect as the engaging projection 10 described in FIG.

In each of the above-mentioned embodiments, the concave portion and the convex portion formed at the positions corresponding to the coils on the lower surface of the television receiver 1 and the upper surface of the charging base 8 have a ring shape in which a plurality of layers are stacked. However, it is needless to say that the shape is not limited to this as long as it has the same effect as described above. For example, as shown in FIG. 7A, radial concave and convex portions may be formed. Small protrusions and protrusion receiving recesses may be formed regularly or irregularly as shown in (b). Although not shown, it is also conceivable that some character or design is formed as a concave portion and a convex portion.

Next, still another embodiment will be described with reference to FIGS. FIG. 8 is a perspective view showing the charging stand in the present embodiment. The charging stand 20 is provided with respect to the slope 21a and the main body receiving section 21b of the housing 21 of the charging stand 20.
The device main body corresponding to the above is set, and the induction coil 15 is arranged and fixed to the inner wall side of the slope 21a as shown by the broken line in the figure. In addition, 11 is a power switch and 12 is a power cord. The lower part of the casing of the television receiver 1 which is the device main body in this case has a shape having a bottom surface portion 1b and a main body inclined surface portion 1c as shown in the side view of FIG. 9, for example. Is opposed to the main body receiving portion 21b of the charging base 20, and the main body sloped portion 1c is opposed to the sloped portion 21a of the charging base 20. Then, the passive coil 12 on the side of the television receiver 1 is fixed at a position where coupling can be obtained with the induction coil 15 (shown by a broken line) with respect to the inner wall side of the main body sloped portion 1c as shown by a broken line in FIG. To be done. Then, as shown in this figure, the television receiver 1 is set on the charging stand 20 and the power switch 11
When is turned on, charging is performed.

In the case of this embodiment, when the main body of the apparatus is not set on the charging stand 20, for example, an object such as a metal piece may be carelessly placed. Since the slope 21a has an inclination,
Even if an object is placed here, it will not fall along the slope and the object will not be positioned on the induction coil 15. In addition, since water drops and the like do not collect on the slope 21a, it is preferable in terms of hygiene.

Therefore, regarding the angle θ with respect to the horizontal of the slope portion 21a of the charging stand 20, this angle H is set within the range of 0 ° <θ ≦ 90 °. In particular, if the weight of the television receiver 1 is I, as shown in FIG.
Is decomposed into a component K parallel to the slope 21a and a component J perpendicular to the slope 21a, and this component J is represented by J = sin θ × I. Since this component J is the force that presses the main body of the device against the charging stand, θ = 9 in the above equation.
J = 0 at 0 °. Therefore, by making the angle H of the inclined surface portion 21a with respect to the horizontal more oblique than the vertical,
The device body can be loaded while being in contact with the charging stand with pressure. Therefore, it is preferable to set the angle between the main body of the device and the slope of the charging stand within the range of 0 ° <θ <90 ° according to various conditions such as the structure of the device and the usage condition.

In this embodiment as well, it is naturally possible to construct a charging device by providing a reed switch on the charging stand 20 side and a magnet on the television receiver 1 side, as in the previous embodiments. Also, it should be noted that a concave portion and a convex portion for engaging and positioning each other may be formed at predetermined positions on the surfaces facing each other when the television receiver 1 is loaded on the charging stand 20. There is no end.
Further, in each of the above-mentioned embodiments, the charging device using the device body as a television receiver has been described, but it goes without saying that it can be applied to a device for charging corresponding to another device as long as it has the same effect. Nor. Also,
Not limited to a charging device that charges a rechargeable battery on the device side, it is naturally applied to a power supply device that can directly drive the device by supplying power to the power supply part of a specific device without contact. Is possible.

[0022]

As described above, in the contactless power supply device of the present invention, a reed switch that operates by magnetic force is provided inside the power supply device, and a magnet that conducts the reed switch is provided on the equipment body side. In this way, the current does not flow in the induction coil unless the main unit of the equipment is set in the feeder, so even if metal is inadvertently placed on the top of the feeder, current will flow in it and generate heat. It has become possible to prevent accidents that would end up. If a plurality of such reed switches are provided, the possibility of further accidents is reduced. In addition, by forming a protrusion on the housing of the feeder and arranging the reed switch on the inner wall side of this protrusion, even if an object such as a magnet is placed at the position above the reed switch, these objects will not protrude. It is possible to prevent the reed switch from malfunctioning because it slides down to the periphery. Further, when the device main body is set on the feeder, by forming a concave portion and a convex portion for engaging both surfaces with respect to each surface facing each other, at least over the area corresponding to the coil. The user can easily detect this abnormality even when a thin metal piece such as a razor blade is caught between the main body of the equipment and the feeder. Furthermore, by forming a housing part where the induction coil is located on a slope and allowing an object placed on this slope to slide down, it is possible to prevent an object from being located on the induction coil and prevent an accident. Become. Further, since water drops also flow downward, water does not accumulate on the slope, which is advantageous from the viewpoint of hygiene.

[Brief description of drawings]

FIG. 1 is a perspective view showing a television receiver and a charging stand as an embodiment of a power supply device of the present invention.

FIG. 2 is a cross-sectional view showing an internal configuration of a television receiver and a charging stand of this embodiment.

FIG. 3 is a cross-sectional view showing a state where the television receiver is mounted on the charging stand in the present embodiment.

FIG. 4 is a cross-sectional view showing a state where a television receiver is loaded on a charging stand with a foreign object sandwiched in the present embodiment.

FIG. 5 is an explanatory view showing a case where an object is placed on the engagement protrusion in the present embodiment.

FIG. 6 is a cross-sectional view showing internal configurations of a television receiver and a charging stand in another embodiment.

FIG. 7 is an explanatory diagram showing another embodiment of the engaging concave portion and the engaging convex portion.

FIG. 8 is a perspective view showing a charging stand in still another embodiment.

FIG. 9 is a side view showing a state where a television receiver is loaded on a charging stand in still another embodiment.

FIG. 10 is a cross-sectional view showing an internal configuration of a device body and a charging stand in a conventional example.

FIG. 11 is an explanatory diagram showing a magnetic field generated between an induction coil and a passive coil.

FIG. 12 is a cross-sectional view showing a state in which a television receiver is loaded on a charging stand with a foreign object sandwiched in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Television receiver 6 Ring-shaped engaging concave part 7,7a Protrusion receiving concave part 8,20 Charging stand 9 Ring-shaped engaging convex part 10,10a Engaging protrusion 12 Passive coil 14,14a Magnet 15 Induction coil 16,16a Reed switch 21a slope part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuhisa Tashiro 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (4)

[Claims] 1. By arranging an induction coil provided on the feeder side and a passive coil provided on the equipment body side in proximity to each other, electric power is supplied to the equipment body side by electromagnetic induction. In the contactless power supply device, a reed switch connected in series to the induction coil is provided inside the feeder, and the reed switch is attached to the device body when the reed switch is loaded in the feeder. A non-contact power supply device, wherein a magnet for operating the reed switch is provided at a position corresponding to. 2. The inside of the feeder is provided with two or more reed switches connected in series with the induction coil, and the device body is provided with the two or more reed switches when loaded in the feeder. The contactless power supply device according to claim 1, wherein the magnet is provided at each position corresponding to the reed switch. 3. The contactless power supply according to claim 1 or 2, wherein a convex portion is formed on a housing of the feeder, and the reed switch is arranged on an inner wall side of the convex portion. apparatus. 4. A concavo-convex surface over a predetermined range on the respective facing surfaces of the housing of the feeder and the housing of the equipment main body when the equipment main body is loaded in the feeder. 4. The non-uniform shape according to claim 1, wherein the uneven surface shape is formed at least over a range corresponding to the arrangement positions of the induction coil and the passive coil. Contact power supply device.