JPH0678477A - Method and apparatus for driving electronic apparatus - Google Patents

Abstract

PURPOSE:To drive an electronic apparatus even without connecting it directly to a power source by supplying power from transmitting means to receiving means in a noncontact state, and driving the apparatus connected to the receiving means. CONSTITUTION:Power transmitted from transmitting means 6 is transmitted to receiving means of a noncontact state with the means 6, and an electronic apparatus 4 connected to the receiving means is driven by power received by the receiving means. That is, a search coil 5 is disposed as the receiving means connected to the apparatus 4 in a magnetic field of a first coil 1 for constituting an AC magnetic field generator as the means 6, a current is induced in the coil 5, and the power generated thereby is supplied to the apparatus 4 to drive it. Thus, even if the power source is not directly connected to the apparatus 4, the apparatus 4 can be driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for supplying electric power from a power transmitting means which is in a non-contact state to a power receiving means to drive an electronic device connected to the power receiving means.

[0002]

2. Description of the Related Art Conventionally, a power transmitting means and a power receiving means to which the transmitting means is connected are electrically directly connected,
This is well known and well known. For example, the transmitter circuit of the transceiver and its battery are electrically and mechanically coupled, and the operator handles the transceiver including the transmitter and the battery as a single unit.

As described above, in the conventional technique, the power transmission means and the power reception means are always electrically connected. It should be noted that a large-scale solar cell installed in outer space and the electric power generated by this solar cell are converted into microwaves and transmitted to the earth, and this microwave energy is converted back into electric power on the earth. However, this technology uses microwaves with extremely high directivity, requires a special parabolic antenna, and is fundamentally different from the present invention using general omnidirectional magnetic fields. It is a thing.

As described above, in the conventional technique, the power transmitting means and the power receiving means are electrically connected directly by a conductive wire or the like, or are connected by a special means such as a microwave.

Therefore, for example, a parabolic antenna cannot be mounted on a card provided with a shoplifting prevention transmission device or a so-called ID card, and a transmission circuit and a battery connected to the parabola antenna are essential constituent elements.

However, the operating current and the leak current of the battery cause the battery's power consumption to decrease, and eventually the battery cannot be used. Therefore, it becomes necessary to replace the battery. If a rechargeable secondary battery is provided, it can be used for a long time by repeating charging without replacing the battery. However, in order to charge the secondary battery, a charger is used for the battery. It was inconvenient to connect to a commercial power source via the.

[0007]

As described above, according to the conventional technique, the operating power and the leakage current of the battery cause the battery to lose its power, which eventually becomes unusable, and the battery must be replaced or charged through the charger. If it is not properly charged by connecting to a commercial power source or the like, the transmitter will not operate when necessary.

The present invention has been made in view of such conventional problems, and supplies electric power to an electronic device separated from a power source without using a special means, and an electronic device not connected to the power source. The present invention relates to a method and an apparatus for appropriately operating a device.

[0009]

A first main invention is to transmit an electric power sent from a power transmitting means to a power receiving means which is not connected to the power transmitting means, and which is connected to the power receiving means. In a driving method of an electronic device that drives a device only with electric power received by a power receiving unit, a coil as a power receiving unit connected to an electronic device is positioned in the magnetic field of the AC magnetic field generator as a power transmitting unit, It is characterized in that a current is induced in the coil, and the electric power generated thereby is supplied to the electronic device to drive it.

A second main invention is provided with an AC magnetic field generator and a coil which is not connected to the AC magnetic field generator and which is integrally connected to an electronic device. The electronic device is a driving device of the electronic device which is located in the magnetic field generated by the AC magnetic field generating device and is driven only by the electric power induced in the coil by the mutual induction action.

[0011]

In the first aspect of the invention, since the coil as the power receiving means connected to the electronic device is positioned in the magnetic field of the AC magnetic field generator as the power transmitting means, a voltage is induced in the coil to induce the induced current. Flows. When the electric power generated thereby is supplied to the electric device, the electronic device operates using the coil as a power source.
The operation of the second invention is substantially the same as the operation of the first invention.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS All the figures show an anti-theft device for a store as one embodiment of the present invention. FIG. 1 is an overall schematic view of this embodiment, FIG. 2 is a perspective view of a transmitter and a coil, and FIG. Is a schematic diagram of another example of the magnetic field generator, FIG. 4 is a circuit diagram of a transmission circuit, FIG. 5 is a signal waveform diagram at each position of the circuit diagram of FIG. 4,
FIG. 6 is a circuit diagram of the alarm device.

Reference numeral 1 is a first coil which constitutes a part of the AC magnetic field generator and is connected to an AC power supply V. The first coil 1 is embedded around an exit E of a store where a customer 2 carries and exits a product to which a card 4 having a search coil 5 is attached. Therefore, the exit E is formed in a scale that allows the customer 2 who purchased the product to pass through.

Reference numeral 3 denotes a product placed in the store, as shown in FIG.
As shown in, the card 4 is attached to the surface,
A search coil 5 and a transmission device 6 as an electronic device arranged in the search coil 5 are printed and printed on the card 4. It is preferable that the search coil 5 and the transmission device 6 are printed and printed so that the purchaser cannot see them.

The transmitter 6 has a well-known electronic circuit inside, which will be described with reference to FIGS. 4 and 5. As shown in FIG. 4, the transmitter 6 includes a rectifier including a diode 13 and a capacitor 14, a DC stable IC 15, and a transmitter 1.
6 and an antenna 17 are provided.

The 200 KHz, 10 Gauss magnetic flux from the first coil 1 causes an AC signal of an induced voltage (about 12.5 V) having a waveform shown in FIG.
This AC signal is converted into a B waveform by the diode 13 and then into a C waveform by the filtering action of the capacitor 14.

Further, the DC stabilizing IC 15 produces a flat DC waveform indicated by D, and when this DC waveform reaches the transmitting section 16, an ID mark signal indicated by E, which is peculiar to the transmitting apparatus 6, is transmitted from the antenna 17 to a notifying apparatus described later. Will be sent to.
The ID mark signal is about 10 to 100 mmW and reaches a distance of about 2 m. As described above, the configuration of the transmitting device 6 is well known in the art, and the above-mentioned numerical values can be selected to desired values by design.

FIG. 6 shows the informing device for receiving the signal transmitted by the transmitting device 6. In FIG. 6, the antenna 1
The signal received at 8 is the high frequency amplifier 19, the tuning circuit 2
0, the demodulation circuit 21, and the ID code check circuit 22 to reach the alarm device 23. This notification device is also well known in the art.

The notification device is arranged in advance in a predetermined place such as an exit accounting office or a supervision room of a store,
When the empty output signal of the transmitter 6 is received, an alarm operation for attracting a person's attention is performed, for example, a sound is generated by a buzzer, a speaker or the like, a light is turned on by an LED or the like.

With the above configuration, when the purchaser (customer) 2 of the product 3 carries the product 3 and passes through the first coil 1, the search coil 5 in the card 4 attached to the product 3
Will move relative to each other across the alternating magnetic field generated by the first coil 1.

Therefore, an AC signal is induced in the search coil 5, and a signal is output from the transmitter 6 by the AC signal. As a result, it is detected that the display means of the notification device placed at the predetermined location is activated and the purchaser 2 is carrying the product 3 and is about to pass through the exit E. In this way, theft of goods is prevented.

As described above, according to this embodiment, even if the card 4 is not equipped with a power source such as a battery, when it approaches the first coil 1 at the exit E, this is surely detected and notified. .

Since the search coil 5 and the transmitting device 6 are printed on the thin plate-shaped card 4, the outer shape is compact and lightweight. Therefore, it can be attached to various products 3. In that case, the appearance of the product 3 is not impaired. Further, since the current for driving the transmitter 6 is covered by the current induced in the search coil 5, it is not necessary to attach a power source such as a battery to the card 4. This means that you don't have to worry about the card at the end of its life.

The magnetic field generator is the first one described above.
The coil 11 and the iron core 1 as shown in FIG. 3 are not limited to the coil.
A combination of two may be used. Although the above-described embodiments apply the present invention to the anti-theft device for goods, the present invention is not limited to this and is applied to various other cases.

For example, if the product 3 is wrapped in wrapping paper,
If this wrapping paper has perforations 7,
If the card 4 is pasted on the perforations 7, it can be used to check the unopened packaging of the product. That is, when the perforation 7 is opened for some reason, the search coil 5 of the card is cut, so
The display means of the alarm device does not operate even through the coil 1 (FIG. 1). Therefore, with this, it is possible to detect that the package is once opened.

As another operating method, so-called ID
It can also be used as a card. That is, the card 4 shown in FIG. 2 is stored as an employee card in an employee's chest pocket or the like, and the first coil 1 shown in FIG. 1 is placed at the entrance of a laboratory or the like where entry by anyone other than the employee is prohibited. Installed,
Check the employees who pass through the entrance of the laboratory.

When a person who does not have the card 4 as an employee card, that is, a person who is not an employee passes through the entrance, the display means of the notification device does not operate, so that the person can immediately discriminate and can prohibit entry. Furthermore, if a charger and a secondary battery are mounted on the search coil 5, the secondary battery in the electrically non-contact position can be charged from the power supply.

[0028]

According to the present invention, since the coil as the power receiving means connected to the electronic device is positioned in the magnetic field of the AC magnetic field generator as the power transmitting means, a voltage is induced in the coil and an induced current is generated. Flowing. When the electric power generated thereby is supplied to the electric device, the electric device operates using the coil as a power source. Therefore, the electronic device can be driven without being directly connected to the power source, and when the electronic device is a secondary battery with a charger, the electronic device can be charged in a non-contact state.

[Brief description of drawings]

FIG. 1 is an overall schematic diagram of an embodiment of the present invention.

FIG. 2 is a perspective view of a transmitter and a coil according to an embodiment of the present invention.

FIG. 3 is a schematic view of another embodiment of the present invention.

FIG. 4 is a circuit diagram of a transmission circuit according to an embodiment of the present invention.

FIG. 5 is a signal waveform diagram at each position of the transmission circuit according to the exemplary embodiment of the present invention.

FIG. 6 is a circuit diagram of an alarm device according to an embodiment of the present invention.

[Explanation of symbols]

 1 1st coil 2 Customer 3 Product 4 Card 5 Search coil 6 Transmitter 7 Perforation 11 Coil 12 Iron core 13 Diode 14 Capacitor 15 DC stable IC 16 Transmitter 17 Antenna 18 Antenna 19 High frequency amplifier 20 Tuning circuit 21 Demodulation circuit 22 ID Code check circuit 23 Alarm device

Claims (5)

[Claims] 1. An electric power sent from a power transmitting means is transmitted to a power receiving means that is not connected to the power transmitting means, and an electronic device connected to the power receiving means is driven only by the power received by the power receiving means. In a method of driving an electronic device, a coil serving as a power receiving unit connected to the electronic device is placed in the magnetic field of an AC magnetic field generator serving as a power transmitting unit, and a current is induced in the coil to generate electric power. Is supplied to the electronic device to drive the electronic device. 2. A coil connected to an electronic device is arranged to move closer to and away from an AC magnetic field generator.
A method for driving the described electronic device. 3. An AC magnetic field generator and a coil that is not connected to the AC magnetic field generator and is integrally connected to an electronic device are provided, and the coil is generated by the AC magnetic field generator. A driving device for an electronic device, which is located in a magnetic field and is driven only by electric power induced in the coil by mutual induction. 4. The drive device for an electronic device according to claim 3, wherein the coil and the AC magnetic field generator that are integrally connected to the electronic device are configured to be able to approach and separate from each other. 5. The drive device for an electronic device according to claim 4, wherein the AC magnetic field generation device is fixed at a fixed position, and a coil integrally connected to the electronic device is movably provided.