JP2607292Y2 - Power supply - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device used for a non-contact rechargeable electric device which is applied to a cordless telephone or a device used around water such as a bathroom.

[0002]

2. Description of the Related Art In recent years, with the spread of cordless devices, many types of power supply devices for charging batteries built in the devices have been commercialized. In the previous power supply device, since a contact for connecting to a cordless device was provided on the surface of the device, there were problems such as touching the contact, electric shock, and poor contact. Therefore, recently, in order to solve such a problem, a non-contact type power supply device having no contact has been put to practical use.

FIG. 13 is a diagram showing a configuration of a conventional non-contact type power supply device, and FIG. 14 is a circuit diagram showing a schematic circuit configuration thereof. This power supply device outputs an output of a commercial power supply AC to a power supply unit 1.
Oscillation circuit 13 oscillates a DC voltage obtained by rectifying and smoothing by rectifying and smoothing circuit 12 in primary winding section 14.
, A magnetic flux is generated, and electric power induced in the secondary winding part 22 of the device main body 21 by electromagnetic induction is supplied to the load 23. According to such a non-contact type power supply device, since both the power supply unit 11 and the device main body 21 can omit the contact, there is no risk of poor contact and the like, and since they are excellent in waterproofness, they can be used in water It can be applied to devices used in such as.

On the other hand, in the case of the above-mentioned non-contact type power supply device, since the electromagnetic induction is used, the device main body 2 is not used.
If the user erroneously puts a metal piece such as a coin or a pin on the power supply section 11 when the power supply section 1 is not mounted on the power supply section 11, an eddy current is generated in the metal piece, causing a problem that heat is generated. There is a fear. Therefore, various proposals have been made to solve this problem.

In Japanese Patent Application Laid-Open No. Hei 3-235626, a switch is provided that protrudes from the housing surface of the power supply unit 11 and is provided between the oscillation circuit 13 and the commercial power supply AC. Oscillation circuit 1
3 is made operable to transmit electric power to the device main body 21 side. Further, there is disclosed a device in which a light emitting diode is provided on the device body 21 side and a phototransistor is provided on the power supply unit 11 side, and the attachment of the device body 21 is detected.

In Japanese Patent Publication No. Sho 60-6657,
A magnet is provided on the device body 21 side, and a reed switch is provided on the power supply unit 11 side. When the reed switch detects the proximity of the magnet, power is supplied to the power supply unit 11 and
Power to the side.

[0007]

However, in the device described in Japanese Patent Application Laid-Open No. 3-235626, even if an object other than the device main body 21 such as a coin is placed on a protruding switch, the switch is closed. Will be lost.
In addition, even if the light emitting diode is provided, the light cannot be emitted when the battery capacity of the device main body 21 is lower than a predetermined level, and even when the device main body 21 is mounted, the light cannot be detected and the device cannot be charged. There is a fear.

In the device described in Japanese Patent Publication No. Sho 60-6657, the power supply unit 11 and the main body 21 of the device where the reed switch and the magnet are opposed to each other so that the magnetic field of the magnet can be detected by the reed switch. The thickness of the housing is restricted. In addition, in order to prevent the reed switch from malfunctioning due to the influence of the magnetic field of the primary winding section 14, the arrangement positions of the reed switch and the magnet with respect to the primary winding section 14 are restricted.

The present invention has been made in view of the above problems, and has as its object to provide a power supply device that reliably transmits power only when a device to which power is to be supplied is mounted.

[0010]

In order to achieve the above-mentioned object, the present invention is directed to a device having a secondary winding unit and a main unit having a load connected to the secondary winding unit. A power supply device having a primary winding part magnetically coupled to the secondary winding part when the power supply is mounted, and switching means for switching the supply of power to the primary winding part by oscillating upon receiving power supply. , A housing comprising a box-shaped lower housing and an upper housing in which the device main body is mounted in a lid shape covering the lower housing, and the upper housing is urged upward and supported so as to be able to move up and down. Biasing support means, and a switch disposed at an appropriate position in the lower housing, interposed between the power supply and the switching means, and provided with a switch having a push-on portion for switching on and off at an upper portion, and the switch includes: The pushing part is Pushed to the upper housing descending in an amount adapted to be switched on (claim 1).

A power supply section having a switching means for oscillating and driving the primary winding section and the power supply to the primary winding section in response to turning on of the power supply; In a power supply device comprising a secondary winding unit magnetically coupled to the primary winding unit when mounted on the power supply unit, and a device main body having a load connected to the secondary winding unit, A main body hole formed in a mounting surface of the housing with the power supply unit, and a detection member urged outward from the inside and made to be able to protrude and retract through the main body hole, A power supply unit which is located at a position facing the main body hole when the device main body is mounted, in which the detection member can be inserted, a detection means for detecting insertion of the detection member, and detection of insertion of the detection member; Control to start the oscillation drive when And a stage (claim 2).

Further, an apparatus main body having a secondary winding section and a load connected to the secondary winding section is detachable, and when the apparatus main body is mounted, magnetically couples to the secondary winding section. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near an inner wall of a surface on which the device main body is mounted. And a control unit that starts the oscillation drive when the capacitance is at a predetermined level.

Further, an apparatus main body having a secondary winding section and a load connected to the secondary winding section is detachable, and is magnetically coupled to the secondary winding section when the apparatus main body is mounted. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near an inner wall of a surface on which the device body is mounted. The apparatus further includes pressure detecting means for detecting a pressure applied to the mounting surface, and control means for starting the oscillation drive when the pressure becomes equal to or higher than a predetermined level (claim 4).

Further, a device main body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and is magnetically coupled to the secondary winding portion when the device main body is mounted. In a power supply device having switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near a surface on which the device main body is mounted. A temperature detecting means for detecting a temperature of the mounting surface; and a stop control means for stopping the oscillation drive when the detected temperature becomes equal to or higher than a predetermined level.

Further, a device body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and when the device body is mounted, it is magnetically coupled to the secondary winding portion. A power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the power supply to the primary winding part in response to turning on of the secondary winding part; A back plate having a contact surface that comes into contact with the device main body when the device main body is mounted, a detection unit disposed on the contact surface, and detecting contact of the device main body; And control means for starting the oscillation drive when detected.

Further, a device main body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and when the device main body is mounted, it is magnetically coupled to the secondary winding portion. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of the secondary winding part, a back upright standing on a surface on which the device body is mounted. a plate, said primary winding part is disposed in the back plate (claim 7).

[0017]

According to the first aspect of the present invention, when the apparatus main body is removed, the upper housing is urged upward and the switch is turned off. On the other hand, when the device main body is mounted on the upper housing, the upper housing is lowered by the weight of the device main body, and the pushing portion is pushed by the lower upper housing and the switch is turned on. Then, the switching means is driven to oscillate in response to turning on of the power, and power is supplied from the primary winding unit to the device main body via the secondary winding unit.

According to the second aspect of the present invention, when the device main body is mounted on the power supply unit, the detecting member is inserted through the hole, the insertion of the detecting member is detected, and the oscillation driving of the switching means is performed. Starting, power is supplied from the primary winding unit to the device body via the secondary winding unit.

According to the third aspect of the present invention, the capacitance of the metal plate is detected. Then, when the device main body is mounted and the capacitance reaches a predetermined level, oscillation driving of the switching means is started, and power is supplied from the primary winding unit to the device main body via the secondary winding unit.

According to the present invention, the pressure applied to the mounting surface of the device main body is detected. And
When the device main body is mounted and the pressure becomes equal to or higher than a predetermined level, the oscillation driving of the switching means is started, and power is supplied from the primary winding unit to the device main body via the secondary winding unit.

According to the present invention, the temperature of the mounting surface of the device main body is detected. Then, when this temperature becomes equal to or higher than a predetermined level, the oscillation drive of the switching means is stopped, and the temperature rise is suppressed.

Further, according to the invention, when the contact of the device body with the back plate is detected, the oscillation drive of the switching means is started, and the primary winding unit is switched to the secondary winding unit. Power is supplied to the device body via the.

Further, according to the invention of claim 7, wherein, when the apparatus body is attached, and the secondary winding of the primary winding part and the device main body disposed in the back plate is magnetically coupled You. Then, the switching means is driven to oscillate in response to turning on of the power, and power is supplied from the primary winding unit to the device main body via the secondary winding unit.

[0024]

FIG. 1 is a view showing the configuration of a first embodiment of an electric apparatus to which the present invention is applied. FIG.
(B) shows a state in which the device body is mounted (placed) on the power supply unit. FIG. 2 is a circuit diagram showing a schematic circuit configuration of the electric device of FIG.

This electric device is, for example, a cordless telephone or an electric razor, and includes a power supply unit 11 and a device main body 21. The housing of the power supply unit 11 is formed of a resin or the like, and includes a box-shaped lower housing 112 that stores various circuit components and a lid-shaped upper housing 111 that covers the lower housing 112. , Can be attached to and detached from a predetermined position on the upper housing 111.

The power supply section 11 supplies a load current and a charging current to the apparatus main body 21, and includes a rectifying / smoothing circuit 12, an oscillating circuit 13, a primary winding section 14 composed of a winding and a core, a control section 15, and the like. The AC input from the connected commercial power supply AC is rectified and smoothed by the rectifying and smoothing circuit 12, and the DC voltage obtained is switched by the oscillation circuit 13 to generate an alternating magnetic flux in the primary winding unit 14. It has become.

The control unit 15 includes a switch 151 interposed between the rectifying / smoothing circuit 12 and the oscillation circuit 13 and a device mounting detecting unit 152. The operation of the oscillation circuit 13 is controlled according to.

The device mounting detection unit 152 is connected to the upper housing 111.
And a spring 17. The spring 17 has one end fixed to the edge of the lower housing 112 and the other end fixed to the bottom surface of the upper housing 111, and can urge the upper housing 111 upward from the lower housing 112 and move up and down. It is to support.

The urging force of the spring 17 is
When an object having a moderate weight is placed, the upper casing 111 descends, and a level is used in which the upper casing 111 does not descend even when a lightweight object such as a coin is placed.

The switch 151 is disposed at an appropriate position in the upper part of the housing of the power supply unit 11, and is turned off when the upper housing 111 is urged upward, that is, when the device main body 21 is not mounted. In a state where the upper housing 111 is lowered, that is, in a state where the device main body 21 is mounted, the pushing portion 151a is pressed by the upper housing 111 to be turned on (turned on).

The device body 21 is composed of a winding 2 and a core 2.
The secondary winding unit 22 and the load unit 23 are mounted on the power supply unit 11 so that the secondary winding unit 22 and the primary winding unit 14 face each other and are magnetically coupled to each other. The load unit 23 includes a load such as a rechargeable battery and a motor, and a rectifier circuit. Then, the generated power of the primary winding unit 14 is induced by electromagnetic induction in the secondary winding unit 22 magnetically coupled to the primary winding unit 14, is rectified by the rectifier circuit, and is supplied to the load. It has become.

With such a configuration, the switch 151 is turned on only when the device main body 21 is mounted on the power supply section 11, and the oscillation circuit 13 operates to supply power to the device main body 21.

On the other hand, even if a small metal object such as a coin is placed on the power supply section 11, the upper housing 111 does not descend and the switch 151 remains off because of its light weight, so that the oscillation circuit 13 operates. Without generating heat, heat generation of the metal object can be prevented.

Next, the second embodiment of the electric equipment to which the present invention is applied.
An example will be described. FIG. 3 is a diagram showing a configuration of a second embodiment of the electric device, wherein FIG.
(B) shows a state in which the device body is mounted on the power supply unit. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the second embodiment, the housing 21 of the device body 21 is
A hole 212 is formed at an appropriate position on the lower surface of the device 1, and the detection member 31 is disposed so as to protrude outward from the inside through the hole 212. The detection member 31 is a rod-shaped body that is urged by a spring 30 fixed in place inside so as to protrude outward by a predetermined length, and has a length that can be immersed to a position flush with the lower surface.

On the other hand, on the upper surface of the housing 113 of the power supply unit 11,
A hole 114 is formed at a position facing the hole 212 when the device main body 21 is mounted at a predetermined position, and this portion is formed to be thick, and serves as a linear guide for the detection member 31 as described later. Functioning. Immediately below the hole 114, a stopper 115 for the detecting member 31 is provided at a required interval.

When the device main body 21 is mounted on the power supply unit 11, the detection member 31 is moved straight and inserted through the hole 114 until the detection member 31 contacts the stopper 115.

The light emitting diode 32 and the phototransistor 33 are arranged between the hole 114 and the stopper 115 so that the inserted detecting member 31 is interposed therebetween so that the light emitting surface and the light receiving surface face each other. Has been established.

The control unit 15 keeps the light emitting diode 32 constantly emitting light, and when the phototransistor 33 receives light from the light emitting diode 32, the switch 15
1 is opened, and when no light is received, the switch 151 is closed.

With this configuration, when the device main body 21 is not mounted on the power supply section 11, the phototransistor 33 receives the light of the light emitting diode 32, the switch 151 is opened, and the operation of the oscillation circuit 13 is started. Stops.

On the other hand, when the device main body 21 is mounted, the phototransistor 33 does not receive the light of the light emitting diode 32 due to the light shielding by the detecting member 31.
51, the oscillation circuit 13 is operated, and the device body 21 is closed.
To supply power.

Further, since the detecting member 31 can be immersed to a position flush with the lower surface of the device main body 21, even if the device main body 21 is placed on a place other than the power supply section 11, for example, on a table. There is no hindrance.

The light emitting diode 32 and the phototransistor 33 may be arranged on the same side, and the light from the light emitting diode 32 may be reflected by the detection member 31 and returned to the phototransistor 33. In this case, the control unit 1
In step 5, the switch 151 may be closed only when there is reflected light.

Further, instead of the light emitting diode 32 and the phototransistor 33, the detecting member 31 of the stopper 115 is used.
A mechanical switch having a movable piece that can be pushed by the urging force of the spring 30 may be provided at the contact position with the switch 151, and this may be used as the switch 151. In this case, when the device main body 21 is mounted, the oscillation circuit 13 can be operated by the detection member 31 pushing in the mechanical switch to turn it on.

Next, the third embodiment of the electric equipment to which the present invention is applied.
An example will be described. 4A and 4B are diagrams showing the configuration of a third embodiment of the electric device, wherein FIG. 4A shows a state in which the device main body is mounted on a power supply unit, and FIG. 4B shows a state in which a metal object is mounted on the power supply unit. Is shown. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the third embodiment, the housing 113 of the power supply 11
A plurality of windows 116 are provided in the upper surface of the device and in the area where the device main body 21 is mounted. The window 116 is formed of a transparent resin or the like so that light can pass therethrough. Each window 116 is made of a small metal object such as a coin.
The windows 116 are distributed so that all the windows 116 are not covered at the same time even if they are placed on each other, or they are provided with an interval therebetween.

The device mounting detector 152 includes a light emitting diode 41 and a phototransistor 42 disposed immediately below each window 116. Each of the light emitting diode 41 and the phototransistor 42 has its light emitting surface and light receiving surface facing the window 116. And the device body 2
When 1 is mounted, light from the light emitting diode 41 is reflected on the lower surface of the device main body 21 and received by the phototransistor 42.

The control section 15 keeps the light emitting diode 41 constantly emitting light, and all the phototransistors 42
The switch 151 is closed only when is receiving light, and the switch 151 is opened when at least one phototransistor 42 is not receiving light.

With this configuration, the switch 151 is closed only when the device main body 21 is mounted on the power supply unit 11,
The oscillation circuit 13 operates. On the other hand, when a metal object 25 such as a coin is placed, as shown in FIG. 4B, all the windows 116 are not covered at the same time.
Since 51 is opened, the oscillation circuit 13 does not operate.

It is to be noted that a plurality of mechanical switches are provided such that the movable piece is exposed at the position of the window 116 and is turned on by being pushed by the equipment body 21 to be mounted. And may be connected in series. In this case, the light emitting diode 41 and the phototransistor 42 become unnecessary.

Next, the fourth embodiment of the electric equipment to which the present invention is applied.
An example will be described. FIG. 5 is a diagram showing a configuration of a power supply unit according to a fourth embodiment of the electric device. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the fourth embodiment, the power supply 11 is
An electrode plate 51 is provided near the inner wall of the portion on which the device main body 21 is mounted on the upper surface of the device 3 so as to face the surface, and the controller 15 controls the material of the object placed on the upper surface of the housing 113. Is determined based on a voltage change due to a change in the capacitance of the electrode plate 51. Then, the switch 151 is closed only when the determination result is resin.

With such a configuration, when a metal object such as a coin is placed on the power supply unit 11, the oscillation circuit 13 does not operate, so that heat generation of the metal object can be reliably prevented.

Next, the fifth embodiment of the electric equipment to which the present invention is applied.
An example will be described. FIG. 6 is a diagram showing a configuration of a power supply unit according to a fifth embodiment of the electric device. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the fifth embodiment, the power supply 11 is
3 and is in contact with an inner wall which is preferably located substantially near the center of a portion where the device main body 21 is mounted,
A pressure sensor 61 is provided which is not deformed by a load applied to the upper surface of the housing 113, for example, is fixed to the bottom surface of the housing 113 and detects the load as pressure.

When the main body 21 is mounted, the upper surface of the housing 113 is bent downward by its weight. Due to the downward bending, the pressure sensor 61 receives pressure from the upper surface of the housing 113 and detects the pressure.

When the pressure detected by the pressure sensor 61 is higher than a predetermined level, the controller 15
51 is closed. The predetermined level is set in advance to be equal to or lower than a pressure value detected when the device main body 21 having a predetermined weight is placed.

With such a configuration, when a light metal object such as a coin is placed on the power supply unit 11, the switch 15
Since 1 remains open, the oscillation circuit 13 does not operate, and heat generation of the metal object can be prevented.

Next, the sixth embodiment of the electric equipment to which the present invention is applied.
An example will be described. FIG. 7 is a diagram showing a configuration of a power supply unit of a sixth embodiment of the electric device. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the sixth embodiment, the power supply 11 is
A temperature sensor 71 for detecting the temperature of the housing 113 is provided in the upper surface of the device 3 near the portion where the device main body 21 is mounted or in contact therewith. Then, the control unit 15 opens the switch 151 when the temperature detected by the temperature sensor 71 exceeds a predetermined level.

With this configuration, even when a metal object such as a coin is placed on the housing 113 and is magnetically coupled to the primary winding portion 14 to generate an eddy current in the metal object and generate heat, the case 1
When the temperature of 13 rises to a predetermined level, switch 15
1 is opened and the operation of the oscillation circuit 13 is stopped, so that burns and deformation of the housing 113 can be prevented.

Next, the seventh embodiment of the electric equipment to which the present invention is applied.
An example will be described. 8A and 8B are diagrams showing a configuration of a seventh embodiment of the electric device, wherein FIG. 8A shows a state in which the device main body is mounted on a power supply unit, and FIG. 8B shows a state in which a metal object is mounted on the power supply unit. Is shown. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the seventh embodiment, the housing 113 of the power supply 11
A back plate 117 is provided upright on the back surface of the device, and a detection piece 153 is disposed at an appropriate position of the back plate 117, for example, at a substantially central position facing the mounted device main body 21. Detection piece 1
53 is rotatably provided at one end to a support shaft within the thickness of the back plate 117, is urged toward the front by a spring (not shown), and projects at a required angle. When,
As shown in FIG. 8A, the back plate 117 is pushed by the device main body 21 so as to be immersed in the thickness of the back plate 117.

The control section 15 detects whether the detecting piece 153 is protruding or immersed, and opens the switch 151 when the detecting piece 153 is protruding, and closes the switch 151 when detecting the immersing of the detecting piece 153. It is.

With such a configuration, even if the metal object 25 such as a coin or a pin is placed on the housing 113, the detection piece 1
Since switch 53 is not pushed into the immersion position, switch 1
51 remains open, and the oscillation circuit 13 does not operate.
Only when the device main body 21 is mounted, the switch 1
51 is closed, and the oscillation circuit 13 is operated.

The detecting piece 153 may be a member that can be protruded and immersed. For example, the detecting piece 153 may be a member configured to move back and forth to protrude and immerse.

Next, the eighth aspect of the electric equipment to which the present invention is applied.
An example will be described. FIG. 9 is a diagram showing a configuration of an eighth embodiment of the electric device. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the eighth embodiment, the housing 113 of the power supply 11
A window 118 is provided on the surface on which the device main body 21 is mounted. The upper surface of the housing 211 of the device body 21
A window 213 is provided at a position facing the window 118. The windows 118 and 213 are formed of a transparent resin or the like so that light can pass therethrough.

The power supply section 11 has a phototransistor 92 having a light receiving surface facing the window 118 immediately inside the window 118.
On the other hand, the device main body 21 has a light emitting diode 91 with the light emitting surface facing the window 213 immediately inside the window 213. The light emitting diode 91 receives power from a voltage induced in the secondary winding unit 22.

Further, the oscillation circuit 13 of the power supply section 11 performs an intermittent operation when connected to a power supply, and switches to a continuous operation when the phototransistor 92 receives light from the light emitting diode 91. It has become. Then, when the phototransistor 92 stops receiving light again, the operation returns to the intermittent operation.

With this configuration, when the device main body 21 is mounted on the power supply unit 11, small power is generated in the primary winding unit 14 due to the intermittent operation of the oscillation circuit 13, whereby the secondary winding unit 22 , A small electric power is induced, and the light emitting diode 91 emits light. Then, when the phototransistor 92 receives light from the light emitting diode 91, the oscillation circuit 13 starts continuous operation and supplies power to the load unit 23.

On the other hand, when something other than the device main body 21, for example, a metal object is placed on the housing 113, the oscillation circuit 13
Since only the intermittent operation is continued, the heat generation of the metal object can be suppressed.

The light emitting diode 91 is connected to the oscillation circuit 1
(3) Since the power is supplied from the voltage induced in the secondary winding section 22 by the intermittent operation and the power is not supplied from the storage battery in the apparatus main body 21, the apparatus main body 21 is mounted on the power supply section 11. Thus, it is possible to reliably emit light regardless of the remaining capacity of the battery.

Further, an oscillation winding is provided in place of the light emitting diode 91, and a reception winding is provided in place of the phototransistor 92. The current flowing in the secondary winding section 22 due to the intermittent operation of the oscillation circuit 13 causes the oscillation winding to alternate. A magnetic field may be induced, a voltage may be induced in the receiving winding by the magnetic field, and the oscillating circuit 13 may detect the induced voltage.

Next, the ninth embodiment of the electric equipment to which the present invention is applied will be described.
An example will be described. FIG. 10 is a diagram showing the configuration of a ninth embodiment of the electric device, wherein FIG.
(B) shows a state in which the device body is mounted on the power supply unit. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the ninth embodiment, no switch 151 is provided between the rectifying / smoothing circuit 12 and the oscillating circuit 13, and the oscillating circuit 13 starts operating when connected to a power supply.

The housing of the power supply unit 11 is
1 and a lower housing 112. Upper case 1
11 and the lower housing 112 are connected via a spring 18. The spring 18 has a predetermined level of biasing force, and when an object having a weight of about the device body 21 is placed thereon,
The upper housing 111 hardly descends even if the lighter 1 is lowered and a light object such as a coin is placed.

The primary winding portion 14 is disposed at a position where the upper surface of the core is substantially at the same height as the edge of the lower housing 112. Therefore, when the device main body 21 is not mounted, the upper housing 111 is separated from the upper surface of the core of the primary winding unit 14 by the urging force of the spring 18 as shown in FIG. Has become.

With this configuration, when the device main body 21 is mounted, the weight of the device main body 21 causes the upper casing 111 to be mounted.
Descends until it comes into contact with the upper surface of the core of the primary winding portion 14,
The primary winding unit 14 and the secondary winding unit 22 of the device main body 21 are magnetically coupled, and a voltage is induced in the secondary winding unit 22 to transmit power.

On the other hand, when a metal object 25 such as a coin lighter than the urging force of the spring 18 is placed,
1 does not drop and the core of the primary winding section 14 and the metal object 25 can be separated from each other, so that the magnetic flux of the primary winding section 14 does not interlink with the metal object 25, Can be prevented from generating heat.

Next, the first example of the electric equipment to which the present invention is applied.
Example 0 will be described. FIG. 11 shows the first electric device.
It is a figure showing composition of an example. It is to be noted that components having the same functions as those of the first embodiment are denoted by the same reference numerals.

In the tenth embodiment, no switch 151 is provided between the rectifying / smoothing circuit 12 and the oscillation circuit 13, and the oscillation circuit 13 starts operating when connected to a power supply.

On the back of the housing 113 of the power supply unit 11, a back space is formed by an upright back plate 119. The primary winding unit 14 is disposed at a suitable position in the back space, preferably at a position higher than the upper surface of the housing 113, in a forward and lateral direction.
It is arranged rearwardly and laterally within. When the main body 21 is mounted, the primary winding unit 14 and the secondary winding unit 22 are magnetically coupled.

With this configuration, when a metal object is placed on the surface of the housing 113 on which the device body 21 is mounted,
Since the magnetic flux from the primary winding unit 14 linked to the metal object is reduced, heat generation of the metal object can be suppressed.

As shown in FIG. 12, a curved portion 121 may be provided at the intersection of the mounting surface of the device main body 21 of the housing 113 and the vertical back plate 119. Even when the metal object 25 is placed so as to lean obliquely against the upright back plate 119 by the curved surface portion 121, the metal object 25 slides on the curved surface portion 121 to lie on the mounting surface, and even when leaning obliquely. In addition, since the distance between the metal object 25 and the primary winding portion 14 is sufficiently ensured, in any case, the heat generation of the metal object 25 can be more reliably prevented.

[0086]

[Effects of the Invention] As described above, in the present invention, the switching means is driven to oscillate only when the main body of the device is mounted. Therefore, even if coins or metal objects such as pins are erroneously mounted, the switching device is driven. The heat generation can be prevented.

Further, a temperature detecting means for detecting the temperature of the mounting surface is provided in the vicinity of the surface on which the device main body is mounted, and when the detected temperature exceeds a predetermined level, the oscillation driving of the switching means is stopped. Accordingly, it is possible to prevent burns and deformation of the housing due to the heat generated by the erroneously placed metal object.

Further, since the back plate is erected on the surface on which the main body of the device is mounted, and the primary winding portion is arranged in the back plate.
It is possible to reduce the magnetic flux linked to the erroneously placed metal object and to suppress heat generation.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a configuration of a first embodiment of an electric device to which the present invention is applied, wherein FIG. 1A shows a power supply unit alone, and FIG. 1B shows a state in which a device body is mounted on the power supply unit. .

FIG. 2 is a circuit diagram showing a schematic circuit configuration of the electric device of FIG. 1;

FIGS. 3A and 3B are diagrams showing a configuration of a second embodiment of the electric device to which the present invention is applied, wherein FIG. 3A shows a power supply unit alone, and FIG. 3B shows a state in which the device main body is mounted on the power supply unit; .

4A and 4B are diagrams showing a configuration of a third embodiment of the electric device to which the present invention is applied, wherein FIG. 4A shows a state in which the device main body is mounted on a power supply unit, and FIG. Shows a state where is placed.

FIG. 5 is a diagram showing a configuration of a power supply unit of a fourth embodiment of the electric equipment to which the present invention is applied.

FIG. 6 is a diagram showing a configuration of a power supply unit of a fifth embodiment of the electric equipment to which the present invention is applied.

FIG. 7 is a diagram illustrating a configuration of a power supply unit according to a sixth embodiment of the present invention.

FIGS. 8A and 8B are diagrams showing a configuration of a seventh embodiment of the electric device to which the present invention is applied, wherein FIG. 8A shows a state in which the device main body is mounted on a power supply unit, and FIG. Shows a state where is placed.

FIG. 9 is a diagram showing a configuration of an eighth embodiment of an electric device to which the present invention is applied.

FIGS. 10A and 10B are diagrams showing a configuration of a ninth embodiment of an electric device to which the present invention is applied, wherein FIG. 10A shows a power supply unit alone, and FIG. 10B shows a state in which the device main body is mounted on the power supply unit. .

FIG. 11 is a diagram showing a configuration of a tenth embodiment of an electric device to which the present invention is applied.

FIG. 12 is a diagram illustrating a main part of a modification of the power supply unit of the electric device in FIG. 11;

FIG. 13 is a diagram illustrating a configuration of a conventional electric device.

FIG. 14 is a circuit diagram showing a schematic circuit configuration of the electric device of FIG. 13;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Power supply part 12 Rectifier smoothing circuit 13 Oscillation circuit (switching means) 14 Primary winding part 15 Control part 17, 18, 30 Spring 21 Machine main body 22 Secondary winding part 23 Load part 25 Metal object 31 Detecting member 32, 41 , 91 Light emitting diode 33, 42, 92 Phototransistor 51 Electrode plate 61 Pressure sensor 71 Temperature sensor 111 Upper housing 112 Lower housing 113, 211 Housing 114, 212 hole 115 Stopper 116, 118, 213 Window 117 Back plate 119 Upright Back plate 151 Switch 151a Push-in part 152 Device mounting detection part 153 Detection piece

Claims (7)

(57) [Scope of request for utility model registration] An apparatus body having a secondary winding section and a load connected to the secondary winding section is detachable, and is magnetically coupled to the secondary winding section when the apparatus body is mounted. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of the secondary winding part, a box-shaped lower housing and a lid covering the lower housing A housing composed of an upper housing in which the device main body is mounted in a shape, an urging support means for urging the upper housing upward and supporting the upper housing so as to be able to move up and down, and disposed at an appropriate upper position in the lower housing A switch provided between the power supply and the switching means, the switch having an on / off switching push-up portion provided at an upper portion thereof, wherein the switch is configured such that the push-down portion is lowered by the weight of the device body. Pressed to switch on A power supply device characterized in that it is adapted to be operated. 2. A power supply unit having a primary winding unit and a switching unit for oscillating and driving power supply to the primary winding unit in response to turning on of a power supply, and detachable from the power supply unit. A power supply device comprising: a secondary winding portion magnetically coupled to the primary winding portion when mounted on the power supply portion; and a device main body having a load connected to the secondary winding portion.
The device main body has a main body hole formed in a mounting surface of the housing with the power supply unit, and a detection member urged outward from the inside and made to be able to protrude and retract through the main body hole. Wherein the power supply unit is a position facing the main body hole in a state where the device main body is mounted, a hole in which the detection member can be inserted, detection means for detecting insertion of the detection member, and the detection member And a control means for starting the oscillation drive when the insertion of the power supply is detected. 3. An apparatus main body having a secondary winding part and a load connected to the secondary winding part is detachable, and is magnetically coupled to the secondary winding part when the apparatus main body is mounted. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near an inner wall of a surface on which the device main body is mounted. A power supply device comprising: a selected metal plate; capacitance detection means for detecting the capacitance of the metal plate; and control means for starting the oscillation drive when the capacitance is at a predetermined level. . 4. A device body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and is magnetically coupled to the secondary winding portion when the device body is mounted. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near an inner wall of a surface on which the device main body is mounted. And a pressure detecting means for detecting a pressure applied to the mounting surface, and a control means for starting the oscillation drive when the pressure becomes equal to or higher than a predetermined level. 5. A device body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and is magnetically coupled to the secondary winding portion when the device body is mounted. In a power supply device having switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of a power supply, the power supply is disposed near a surface on which the device main body is mounted. A power supply device comprising: temperature detection means for detecting the temperature of the mounting surface; and stop control means for stopping the oscillation drive when the detected temperature becomes equal to or higher than a predetermined level. 6. A device body having a secondary winding part and a load connected to the secondary winding part is detachable, and is magnetically coupled to the secondary winding part when the device body is mounted. A power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the power supply to the primary winding part in response to turning on of the secondary winding part; A back plate having a contact surface that comes into contact with the device main body when the device main body is mounted, a detection unit disposed on the contact surface and detecting contact of the device main body, and a contact between the device main body and A power supply device comprising: a control unit that starts the oscillation drive when detected. 7. A device body having a secondary winding portion and a load connected to the secondary winding portion is detachable, and is magnetically coupled to the secondary winding portion when the device body is mounted. In a power supply device having a switching means for switching the supply of power to the primary winding part by oscillating and driving the primary winding part in response to turning on of the secondary winding part, a back upright standing on a surface on which the device body is mounted. A power supply device comprising a plate, wherein the primary winding portion is disposed in the back plate.