JP2001352698A - Power controller, power control system, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To deter a user from being the victim of robbery of an electronic apparatus and others, by controlling the power supply state of a portable electronic apparatus in use of electromagnetic induction. SOLUTION: This power control system 1 is composed of a power pad 3 which is equipped with a power transmitter 31 for generating magnetic field, based on the AC voltage of specified frequency generated by a power receiver 21; and a battery case 4 which possesses a power controller 2 being equipped with a power receiver 21, where electromotive force is induced by the magnetic field generated by the power transmitter 31, and a microcomputer 22 for switching transistors TR1 and TR2 to be ON, when the electromotive force in the power receiver 21 conforms to a preset voltage value, and switching the transistors TR1 and TR2 to be OFF, when the electromotive force in the power receiver 21 does not conform to the voltage value. An electronic apparatus is disabled if it is shifted without permission, by mounting the battery case 4 with a built-in power controller to the electronic apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a power supply control device for controlling power supply to a portable electronic device, a power supply control system using the same, and an electronic device equipped with the same.

[0002]

2. Description of the Related Art Conventionally, power supply using electromagnetic induction has been widely performed. In recent years, in particular, in recent years, a primary circuit and a secondary circuit have been separately configured and can be separated. .

For example, Japanese Utility Model Application Laid-Open No. 63-90937 discloses an electronic device in which a secondary battery built in a main body is charged by supplying power from outside the main body.
Similarly, Japanese Utility Model Application Laid-Open No. 5-91154 discloses a device for charging a rechargeable battery in an electronic device main body from outside without using a contact. Further, Japanese Patent Application Laid-Open
Japanese Unexamined Patent Application Publication No. 11-307376 discloses a contactless charging device utilizing the same principle.
Japanese Patent Application Laid-Open Publication No. HEI 10-125131 similarly discloses a non-contact interface using electromagnetic induction and a power supply method thereof.

[0004] For example, Japanese Patent Application Laid-Open No. Hei 10-23676 discloses a rechargeable electronic device capable of charging a rechargeable battery in a main body with respect to various electronic devices having different shapes. Further, Japanese Patent Application Laid-Open No. H11-187852 discloses an electromagnetic induction power supply that supplies a more stable power when supplying power by electromagnetic induction as described above.

[0005]

As described above, a method of supplying power using electromagnetic induction has been widely used in the past. However, an electromotive force is applied to a separately configured device without contact. There have been no examples of effectively using the characteristics provided to prevent theft or mischief.

SUMMARY OF THE INVENTION It is an object of the present invention to control the power supply state of a portable electronic device by using electromagnetic induction so as to prevent theft of the electronic device.

[0007]

According to a first aspect of the present invention, there is provided a power supply control device for controlling power supply to an electronic device, wherein an electromotive force is induced by a surrounding magnetic field. When the electromotive force in the power receiving unit (21) is equal to a preset voltage value, the power supply to the electronic device is executed, and the electromotive force in the power receiving unit is set. And a control unit (for example, the microcomputer 22 shown in FIG. 1) for stopping power supply to the electronic device when the voltage does not match.

According to the first aspect of the present invention, in a power supply control device for controlling power supply to an electronic device, an electromotive force is generated by a surrounding magnetic field by a power receiving unit, and the electromotive force in the power receiving unit is controlled by the control unit in advance. If the voltage value matches the set voltage value, the power supply to the electronic device is executed. If the electromotive force at the power receiving unit does not match the set voltage value, the power supply to the electronic device is stopped.

Here, as the electronic equipment, for example, a personal computer, a PDA (Personal Digital Assis
tant: personal information terminal) or DVD, MD (MiniDi
sc), CD (Compact Disc), DAT (Digital Audio)
Tape), cassette tapes and other portable players and recorders, and portable TVs, car navigation systems, portable telephones, cameras and digital cameras, and other electronic devices that can be easily carried with the battery. An external power supply may be used.

Therefore, power is supplied to the electronic device only in an environment where an electromotive force having a preset voltage value is generated by the power receiving unit, and the electronic device can be used. Further, when the electronic device is moved from the above environment, the electronic device becomes unusable. Therefore, it is possible to prevent the electronic device from being moved, taken out, or stolen without permission, thereby preventing troubles caused by theft or inadvertent movement of the electronic device. In addition, if the present invention is applied to an electronic device capable of recording data, power is not supplied when the electronic device is taken away without permission, so that stored data cannot be read and data can be protected. Further, since the electromotive force is induced by the surrounding magnetic field, the power receiving unit does not need to be connected to an external device by wire, and the power supply control device of the present invention can be stored and used inside the electronic device. .

According to a second aspect of the present invention, in the power supply control device of the first aspect, a switch (for example, transistors TR1 and TR2 shown in FIG. 1) for switching a connection state between the electronic device and a power supply of the electronic device is provided. The apparatus further includes the control unit causing the power supply to the electronic device to be executed or stopped by switching the switch.

According to the second aspect of the present invention, the connection state between the electronic device and the power supply of the electronic device is switched by the switch, and the control unit switches the switch to
The power supply to the electronic device is executed or stopped.

Therefore, since the execution / stop of the power supply is switched by switching the switch, it is difficult to restart the power supply from the state where the power supply is stopped, ignoring the operation of the control unit. For this reason, even if the electronic device is moved, taken out, or stolen without permission, the electronic device cannot be easily used, so that trouble caused by theft or careless movement of the electronic device can be more reliably suppressed. Further, in an electronic device capable of recording data, more reliable data protection can be performed.

According to a third aspect of the present invention, there is provided a power transmission device (for example, a power supply pad 3 shown in FIG. 1) and a power supply control device (2).
In the power supply control system (1) for controlling power supply to an electronic device, the power transmission device includes a power supply circuit (32) for generating an AC voltage having a predetermined frequency, and an AC power generated by the power supply circuit. A power transmission unit (31) that generates a magnetic field based on a voltage, wherein the power supply control device includes a power reception unit (21) in which electromotive force is induced by a magnetic field generated by the power transmission unit included in the power transmission device; If the electromotive force in the power receiving unit matches a preset voltage value, the power supply to the electronic device is executed.If the electromotive force in the power receiving unit does not match the set voltage value, A control unit (for example, the microcomputer 22 shown in FIG. 1) for stopping power supply to the electronic device.

According to a third aspect of the present invention, in a power supply control system that includes a power transmission device and a power supply control device and controls power supply to an electronic device, the power transmission device uses a power supply circuit to supply an alternating current having a predetermined frequency. A voltage is generated, a power transmitting unit generates a magnetic field based on the AC voltage generated by the power supply circuit, and the power control unit generates an electromotive force by the power receiving unit by the magnetic field generated by the power transmitting unit included in the power transmitting device. The control unit causes the power supply to the electronic device to be executed when the electromotive force at the power receiving unit matches a preset voltage value, and when the electromotive force at the power receiving unit does not match the set voltage value. The power supply to the electronic device is stopped.

Here, examples of the power supply circuit include those including an AC-DC converter for generating a DC voltage based on an AC voltage supplied from an AC power supply, an oscillation circuit, and the like.

Therefore, only when the electromotive force is induced in the power receiving unit by the magnetic field generated by the power transmission device, power is supplied to the electronic device, and the electronic device can be used. Therefore, even if an electromotive force is induced in the power receiving unit by a magnetic field generated by a device other than the power transmitting device, power is not supplied to the electronic device. Thereby, the electronic device is
Since the electronic device becomes inoperable except in the vicinity of the power transmission device, it is possible to move the electronic device without permission, lose the willingness to take it out or steal it, and to suppress troubles caused by theft or inadvertent movement of the electronic device. In addition, if the present invention is applied to an electronic device capable of recording data, power is not supplied when the electronic device is taken away without permission, so that stored data cannot be read and data can be protected. Furthermore, since the power transmission device and the power supply control device are connected via a magnetic field, there is no need to wire-connect to an external device, and the present invention can be easily applied to various electronic devices.

According to a fourth aspect of the present invention, in the power supply control system according to the third aspect, the power supply control device switches a connection state between the electronic device and a power supply of the electronic device (for example, as shown in FIG. 1). Transistors TR1, TR
The control device may further include 2), wherein the control unit causes the power supply to the electronic device to be executed or stopped by switching the switch.

According to the fourth aspect of the present invention, the power supply control device switches the connection state between the electronic device and the power supply of the electronic device by the switch, and the control unit controls the power supply to the electronic device by switching the switch. Let the supply run,
Or stop it.

Therefore, the power supply control device switches execution / stop of power supply by switching the switch.
It is difficult to restart the power supply from the state where the power supply is stopped, ignoring the operation of the control unit. For this reason,
Even if the electronic device is moved, taken out, or stolen without permission, the electronic device cannot be easily used, so that trouble caused by theft or inadvertent movement of the electronic device can be more reliably suppressed. Further, in an electronic device capable of recording data, more reliable data protection can be performed.

According to a fifth aspect of the present invention, there is provided an electronic apparatus (for example, FIG. 3) which operates using a built-in battery (41) as a power supply.
4 or a portable player 6 shown in FIG. 4), wherein a power receiving unit (21) in which an electromotive force is induced by a surrounding magnetic field, and a switch () for switching a connection state between the battery and the electronic device. For example,
By switching the switches and the transistors TR1 and TR2 shown in FIG. 1, when the electromotive force in the power receiving unit matches a preset voltage value, the power supply to the electronic device is executed, and the power reception is performed. If the electromotive force in the unit does not match the set voltage value, the control unit (for example, FIG. 1) stops power supply to the electronic device.
(2) a power supply control device comprising:
It is characterized by having.

According to the fifth aspect of the present invention, there is provided an electronic apparatus which operates using a built-in battery as a power supply, wherein an electromotive force is induced by a surrounding magnetic field by a power receiving unit, and a switch between the battery and the electronic apparatus is generated by a switch. By switching the connection state and switching the switch by the control unit, when the electromotive force in the power receiving unit matches a preset voltage value, the power supply to the electronic device is executed,
When the electromotive force in the power receiving unit does not match the set voltage value, a power supply control device for stopping power supply to the electronic device is provided.

Therefore, the electronic device is supplied with power by the power receiving section only in an environment where an electromotive force having a preset voltage value is generated, and can be used. In addition, since the electronic device becomes unusable when moved from the above environment, the electronic device can be moved without permission, the intention to take it out or steal is lost, and troubles caused by theft or careless movement can be suppressed. In the case of an electronic device capable of recording data, power is not supplied when the electronic device is taken away without permission, so that stored data cannot be read and data can be protected. Since the power receiving unit generates an electromotive force due to a surrounding magnetic field, it is not necessary to be connected to an external device by wire, and the power supply control device can be built in the electronic device without affecting the exterior.

Further, the control unit provided in the power supply control device includes:
Since the execution / stop of the power supply is switched by switching the switch, it is difficult to restart the power supply from the state where the power supply is stopped, ignoring the operation of the control unit. Therefore, even if the user moves without permission, takes it out, or steals, it cannot be used easily, so that trouble caused by theft or careless movement can be more reliably suppressed. Further, in an electronic device capable of recording data, more reliable data protection can be performed.

[0025]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a power supply control system 1 according to an embodiment of the present invention. As shown in FIG. 1, the power supply control system 1 includes a power supply pad 3,
It is divided into a battery case 4 in which the power supply control device 2 is built.

The power supply pad 3 includes a power transmission section 31 and a power supply circuit 32.
3 to an alternating current (AC) power supply. Here, the AC power source is, for example, 100 V (volt) for home use.
The power supply is a power supply or a 200 V power supply for business use, but is not limited to this voltage value. The power supply control system 1 depends on the power supply in an area where the power supply control system 1 is used.
Can of course be configured.

The power transmission unit 31 has a built-in coil,
A magnetic field is generated by an AC voltage having a predetermined frequency supplied from the power supply 2. The power supply circuit 32 converts the power supplied through the power supply connector 33 into a switching AC voltage having a predetermined frequency, and supplies the switching AC voltage to the power supply connector 33. Note that the frequency and the voltage value of the AC voltage supplied from the power supply circuit 32 to the power transmission unit 31 are values that are specific to the power supply circuit 32 and are set in advance.

The battery case 4 has a battery 4
1, a connector 42, and power supply lines 43, 43 are incorporated.

The battery 41 includes a rechargeable battery such as a secondary battery using a hydrogen storage metal such as a nickel hydrogen battery, a nickel-cadmium secondary battery, a lithium ion secondary battery, and a secondary battery using ceramic. Then, power is supplied to an electronic device connected to a connector 42 described later. Further, the battery 41 is connected to a power receiving unit 21 described later, and can be charged by the power supplied from the power receiving unit 21.

The connector 42 is connected to an internal circuit of the electronic device in which the battery case 4 is mounted, and power is supplied from the battery 41 to the electronic device via the connector 42.

The power supply lines 43, 43 are power supply lines for connecting the battery 41 and the connector 42, and supply a minimum necessary power to the electronic equipment connected to the connector 42. Here, the minimum necessary power is, for example, when a computer is connected to the connector 42, the power at which a clock function built in the computer can operate, or the storage in a volatile storage element built in the computer. It refers to the power required to maintain the contents, such as the power required to maintain the contents, so as not to hinder the use of the electronic device again. The electronic device connected to the connector 42 cannot perform its original function only by the power supplied through the power supply lines 43.

The power supply control device 2 is built in the battery case 4. The power control device 2 includes a power receiving unit 2
1, a microcomputer 22, power supply lines 23 and 24, transistors TR1 and TR2, and the like.

The power receiving unit 21 includes a coil formed of a ferrite core and a copper winding, and outputs an electromotive force generated by the magnetic field generated by the power transmitting unit 31 to the microcomputer 22 and the battery 41. Therefore, the power supply pad 3
The power transmitting unit 31 included in the power control unit 2 and the power receiving unit 21 included in the power supply control device 2 constitute a kind of transformer, and the power transmitting unit 31 functions as a primary side and the power receiving unit 21 functions as a secondary side.

When the power supply pad 3 and the battery case 4 are close to each other, the electromotive force induced in the power receiving unit 21 is determined by the ratio of the number of turns of the coil provided in the power transmitting unit 31 to the coil provided in the power receiving unit 21 and the power supply circuit 32. Is determined by the frequency and voltage value of the AC voltage generated by

The microcomputer 22 includes a power receiving unit 2 as described later.
1 and the switching of the transistors TR1 and TR2 is performed based on the voltage value.

The transistor TR1 is provided on the power supply line 23 connecting the battery 41 and the connector 42, and the transistor TR2 is provided on the power supply line 24.

When the transistors TR1 and TR2 are turned on under the control of the microcomputer 22, the battery 41 and the connector 42 can be energized, and power can be supplied from the battery 41 to the electronic device connected to the connector 42. Become. The electric power supplied via the power supply lines 23 and 24 is the electric power required by the electronic device during normal operation. The transistor T is controlled by the microcomputer 22.
When R1 and TR2 are turned off, the battery 41 and the connector 42 cannot be energized.

Accordingly, by controlling the transistors TR1 and TR2 by the microcomputer 22, the connector 42
ON / OFF of the power supply to the electronic device connected to the device.

Here, the operation of the microcomputer 22 will be described with reference to the flowchart of FIG.

First, the microcomputer 22 detects the electromotive force in the power receiving unit 21 and determines whether or not the voltage value is equal to a preset voltage value (Step S1). here,
If the voltage value at power receiving unit 21 is equal to a preset voltage value, microcomputer 22 sets transistors TR1 and TR
2 is turned ON (step S2), and the process ends. If the voltage value in power receiving unit 21 is different from the set voltage value, transistors TR1 and TR2 are turned off.
Switch to F (step S3) and end the process.

Then, the microcomputer 22 executes the processing shown in the flowchart of FIG. 2 at predetermined time intervals, and appropriately switches ON / OFF of the transistors TR1 and TR2.

Here, the voltage value preset in the microcomputer 22 is the voltage value of the electromotive force induced in the power receiving unit 21 by electromagnetic induction from the power transmitting unit 31 in a state where the power supply pad 3 and the battery case 4 are close to each other. Value.

That is, the power supply control device 2 and the power supply pad 3 in the power supply control system 1 correspond to each other on a one-to-one basis.
The voltage value of the electromotive force induced in the power receiving unit 21 when the corresponding power supply pad 3 is used is set.

Therefore, the microcomputer 22 is connected to the power control device 2
Turns on the transistors TR1 and TR2 only in a state close to the corresponding power supply pad 3. Therefore, when the power supply control device 2 is separated from the power supply pad 3, the transistors TR1 and TR2 are turned off. Further, in the power receiving unit 21, although an electromotive force is induced by a magnetic field generated by a device other than the corresponding power supply pad 3,
If the electromotive force does not match the voltage value set in the microcomputer 22, the transistors TR1 and TR2 are turned off.

Thus, the electronic device in which the battery case 4 is mounted can operate only in the vicinity of the corresponding power supply pad 3 on a one-to-one basis, and cannot be used when separated from the power supply pad 3. Also, it is difficult to operate using another device having the same configuration as the power supply pad 3. For this reason, if the electronic device is moved without permission, the electronic device cannot be used, so that motivation for theft is lost and theft can be suppressed. Further, for example, when data is stored in the electronic device, the data cannot be read, and the data can be protected.

As described above, the power supply control system 1 attaches the battery case 4 containing the power supply control device 2 to the electronic device and uses the battery case 4 as a power source for the electronic device, so that the power supply control system 1 can be used outside the vicinity of the power supply pad 3. It can be used for deterrence, theft prevention and record protection.

For example, in a retail store, electronic devices are exhibited as samples for sales promotion and advertisement.
Demonstration operations are often performed to show the function to customers. This is a useful opportunity for the customer to take a look at the desired product and actually check the operation.

However, the risk of theft is great, and anti-theft measures such as fixing the electronic device with a wire or the like, or attaching an alarm device for notifying an alarm when detached to the electronic device body have been adopted. .

According to the power supply control system 1 of the present embodiment, the use of an electronic device can be restricted by mounting it on the electronic device as a battery of the electronic device. Since the power supply pad 3 and the battery case 4 do not need to be connected by wire, they can be used without giving the customer an intimidating feeling and without damaging or scratching the exterior of the electronic device.

Here, FIGS. 3 and 4 show examples in which the power supply control system 1 is applied to electronic equipment. FIG.
The above power supply control system 1 is connected to a personal computer 5
It is a figure showing the example applied to.

The personal computer 5 includes a liquid crystal display, a keyboard, a pointing device, and a CPU.
(Central Processing Unit), RAM (Random Acces)
s Memory), a recording medium such as a hard disk drive or flash memory, etc.
It is a so-called notebook computer. The main body of the personal computer 5 has a battery storage section 51 formed therein, and operates using a battery built in the battery storage section 51 as a power supply.

Then, in the personal computer 5, the battery case 4 (FIG. 1)
Is stored, and the battery 41 is used as a power source of the personal computer 5. A flat power supply pad 3 is provided under the personal computer 5. The power supply pad 3 is similar to the power supply pad 3 shown in FIG.

In the example shown in FIG. 3, the personal computer 5 operates using the battery 41 in the battery storage 51 as a power source, and thus can be used while being placed on the power supply pad 3.

Then, when the personal computer 5 is separated from the power supply pad 3, the power supply to the personal computer 5 is stopped by the microcomputer 22 (FIG. 1), and it becomes impossible to operate various application programs. In addition, the personal computer 5
It becomes impossible to read the data stored in the. It should be noted that the personal computer 5 is supplied with the minimum necessary power via the power supply lines 43, 43 (FIG. 1). Therefore, the clock function and the like of the internal circuit of the personal computer 5 operate, so that the microcomputer 22
When the power supply is turned on again, the personal computer 5 can be used without any problem.

Therefore, by applying the security system 1 to the personal computer 5, it is possible to prevent theft by not motivating theft, and also to protect data and the like in the personal computer 5. Further, since the battery case 4 is stored in the battery storage section 51, it is not necessary to fix the device to the exterior surface of the personal computer 5. For this reason, theft can be suppressed without damaging or scratching the personal computer 5.

For example, when the personal computer 5 is displayed at a retail store, if the power supply pad 3 is fixed or built in the display, the anti-theft function can be sufficiently performed. The personal computer 5 includes a power pad 3
Demonstration operations can be performed on the exhibition stand where the is fixed, and customers can try to operate it. Further, as described above, the personal computer 5 does not operate on the power supply pad 3 that does not correspond. For this reason, the personal computer 5 operates only on a specific display stand, and becomes inoperable when moved from the display stand.

The example shown in FIG. 3 can be easily applied not only to the display of the personal computer 5 in a store but also to a portable electronic device in an office, for example. In recent years, miniaturization of office electronic devices has been progressing. However, by applying the power supply control system 1, it is possible to prevent taking out of company assets and protect confidential data.

FIG. 4 is a diagram showing an example in which the power supply control system 1 is applied to a portable player 6. The portable player 6 is an MD (MiniDisc), CD (Compact Di
sc), a DAT (Digital Audio Tape), a cassette tape or the like to reproduce music. For example, as shown in FIG. 4, various operation switches are provided, and headphones and the like can be connected. The main body of the portable player 6 is provided with a battery storage section 61, and the portable player 6 is normally operated by a battery in the battery storage section 61.

When the battery case 4 (FIG. 1) is stored in the battery storage section 61, the battery case 4 can be used only in a state close to the power supply pad 3 corresponding to the power supply control device 2 in the battery case 4. The power supply pad 3 is similar to the power supply pad 3 shown in FIG. 1, and its outer case has a size suitable for the portable player 6.

In the example shown in FIG. 4, the portable player 6
Can be used in the state close to the power supply pad 3, and thus can be used, for example, for display of the portable player 6 at a store. That is, if the power supply pad 3 is fixed to the exhibition stand, the portable player 6 can be used while the portable player 6 is mounted on the exhibition stand, so that the demonstration operation can be performed or the customer can operate the portable player 6.

Further, if the portable player 6 is separated from the exhibition stand, the portable player 6 becomes unusable, and the motivation for theft is lost, thereby preventing theft. Furthermore, since the portable player 6 that is away from the power pad 3 does not operate, mischief due to an abnormal operation can be prevented.

The power supply control system 1 can be applied without damaging or dirting the exterior of the portable player 6. Furthermore, if the size, shape, supply power, and the like of the battery case 4 conform to general-purpose standards, it is easy to operate the power supply control system 1 used for the portable player 6 by attaching it to another device. .

In addition to the examples shown in FIGS. 3 and 4, the power supply control system 1 includes a PDA (Personal Digital Assistant: personal information terminal), a DVD player, a portable TV, a car navigation system, The present invention is applicable to easily movable and portable electronic devices, such as mobile phones, cameras, and digital cameras. Further, the battery 41 may be a non-rechargeable battery containing a dry cell.

In the above embodiment, when the electromotive force in power receiving unit 21 does not match the set voltage value, microcomputer 22 connects battery 41 to connector 4.
The power supply to the power control device 2 is stopped, but the present invention is not limited to this.
A warning device such as a buzzer may be built in the power receiving unit 21 to notify a warning when the electromotive force in the power receiving unit 21 does not match the set voltage value.

Further, a configuration may be adopted in which a wireless transmission device is connected to the microcomputer 22 and a predetermined alarm signal is wirelessly transmitted when the electromotive force in the power receiving unit 21 does not match the set voltage value. In this case, an abnormality in the power supply control system 1 can be detected by a receiving device capable of receiving the predetermined alarm signal. Alternatively, if the alarm signal is continuously transmitted by the wireless transmission device, the position of the moved battery case 4 can be detected by the reception device, and therefore, the battery case 4 can be tracked.

The power supply pad 3 has a configuration in which each of the power supply pads 3 has a flat outer case. However, the present invention is not limited to this. Is not particularly limited. Further, the battery 41 may be directly connected to an AC power supply, and the supply of power from the AC power supply to the connector 42 may be controlled by the microcomputer 22. In addition, specific details may be appropriately changed. Of course.

[0068]

According to the first aspect of the present invention, the power is supplied to the electronic device by the power receiving unit only in an environment where an electromotive force having a predetermined voltage value is generated, and the electronic device can be used. If moved from the above environment, the electronic device becomes unusable. For this reason, moving the electronic device without permission, taking it out, or disappearing to steal,
Troubles caused by theft or inadvertent movement of electronic devices can be suppressed. In addition, if the present invention is applied to an electronic device capable of recording data, power is not supplied when the electronic device is taken away without permission, so that stored data cannot be read and data can be protected. Furthermore, since the power receiving unit generates electromotive force due to the surrounding magnetic field, there is no need to wire-connect to an external device,
The power supply control device of the present invention can be stored and used inside an electronic device.

According to the second aspect of the present invention, since the execution / stop of the power supply is switched by switching the switch, the operation of the control unit is ignored, and the power supply is restarted from the state where the power supply is stopped. It is difficult. For this reason, even if the electronic device is moved, taken out, or stolen without permission, the electronic device cannot be easily used, so that trouble caused by theft or careless movement of the electronic device can be more reliably suppressed. Further, in an electronic device capable of recording data, more reliable data protection can be performed.

According to the third aspect of the present invention, the electronic device is inoperable except in the vicinity of the power transmission device. The electronic device is unwillingly moved, taken out, or stolen without permission, and Trouble caused by theft or careless movement can be suppressed. If the present invention is applied to an electronic device capable of recording data, power is not supplied when the electronic device is taken away without permission, so that stored data cannot be read and data can be protected. Furthermore, since the power transmission device and the power supply control device are connected via a magnetic field, there is no need to wire-connect to an external device, and the present invention can be easily applied to various electronic devices.

According to the fourth aspect of the invention, it is difficult to restart the power supply from the state where the power supply is stopped, ignoring the operation of the control unit. For this reason, even if the electronic device is moved, taken out, or stolen without permission, the electronic device cannot be easily used, so that trouble caused by theft or careless movement of the electronic device can be more reliably suppressed. Also,
In an electronic device capable of recording data, more reliable data protection can be performed.

According to the fifth aspect of the present invention, it is possible to move the electronic device without permission, lose the willingness to take it out or steal it, and to suppress troubles caused by theft or careless movement. Further, in the case of an electronic device capable of recording data, if the electronic device is taken away without permission, the stored data cannot be read out and the data can be protected. Further, there is no need to wire-connect to an external device, and the power supply control device can be built in the electronic device without affecting the exterior. It is difficult to restart the power supply from a state in which the power supply has been stopped, ignoring the operation of the control unit provided in the power supply control device. In an electronic device that can record the data, highly reliable data protection can be performed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a power supply control system 1 according to an embodiment to which the present invention is applied.

FIG. 2 is a flowchart showing an operation of a microcomputer 22 shown in FIG.

FIG. 3 is an external view showing an application example of the power supply control system 1 of FIG.

FIG. 4 is an external view showing an application example of the power supply control system 1 of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power supply control system 2 Power supply control device 21 Power receiving unit 22 Microcomputer 23, 24 Power supply line 3 Power supply pad 31 Power transmission unit 32 Power supply circuit 33 Power supply connector 4 Battery case 41 Battery 42 Connector 43,44 Power supply line 5 Personal computer 51 Battery storage unit 6 Portable player 61 Battery storage

Claims (5)

[Claims] 1. A power supply control device for controlling power supply to an electronic device, comprising: a power receiving unit in which an electromotive force is induced by a surrounding magnetic field; and a case where the electromotive force in the power receiving unit matches a preset voltage value. Power supply to the electronic device,
And a control unit for stopping power supply to the electronic device when the electromotive force in the power receiving unit does not match the set voltage value. And a switch for switching a connection state between the electronic device and a power supply of the electronic device, wherein the control unit switches the switch to execute power supply to the electronic device, or The power supply control device according to claim 1, wherein the power supply control device is stopped. 3. A power supply control system comprising a power transmission device and a power control device for controlling power supply to an electronic device, wherein the power transmission device generates an AC voltage having a predetermined frequency; A power transmission unit that generates a magnetic field based on the AC voltage generated by the circuit, the power supply control device, a power receiving unit in which electromotive force is induced by a magnetic field generated by the power transmission unit included in the power transmission device, When the electromotive force in the power receiving unit matches a preset voltage value, the power supply to the electronic device is executed,
And a control unit for stopping power supply to the electronic device when the electromotive force in the power receiving unit does not match the set voltage value. 4. The power supply control device further includes a switch for switching a connection state between the electronic device and a power supply of the electronic device, and the control unit controls the power supply to the electronic device by switching the switch. The power supply control system according to claim 3, wherein supply is executed or stopped. 5. An electronic device that operates using a built-in battery as a power supply, a power receiving unit in which an electromotive force is induced by a surrounding magnetic field, a switch for switching a connection state between the battery and the electronic device, When the electromotive force in the power receiving unit matches a preset voltage value, the power supply to the electronic device is executed, and the electromotive force in the power receiving unit matches the set voltage value. And a control unit for stopping power supply to the electronic device when not performed. An electronic device, comprising: