US20020000792A1 - Cordless power transmission system, power transmission terminal and electrical appliance - Google Patents

Abstract

A cordless power transmission system can transmit and receive power stably without malfunctions. A power transmission terminal transmits default power to an electrical appliance by diffractive electromagnetic waves. The electrical appliance transmits its own unique data and required power intensity data to the power transmission terminal by diffractive electromagnetic waves. A network host assigns an ID to the electrical appliance. Under the control of the network host, the power transmission terminal transmits the assigned ID data and the power with the required intensity to the electrical appliance by rectilinear electromagnetic waves.

Description

BACKGROUND OF THE INVENTION
• 1. Field of the Invention[0001]
• The present invention relates to a cordless power transmission system, power transmission terminal and electrical appliance, which transfer power by electromagnetic waves.[0002]
• 2. Description of Related Art[0003]
• As a conventional cordless power transmission system, there is known an LSI that is used for non-contact card or the like. It receives very feeble microwaves emitted into a communication space within a certain range, and operates by converting them into electric power. Such a system is applied to simple data transfer in ticket inspection at a ski lift, or in an intelligent transport system, for example.[0004]
• Since the conventional cordless power transmission system supposes a single device within a narrow range, it cannot designates a specific device when there are multiple LSI cards within the range of the very feeble microwaves. Thus, the system can bring about erroneous operations in such a situation, presenting a problem of being unsuitable for large scale data communications or radio power transmission. Besides, the system is lacking in versatility with only limited applications.[0005]
SUMMARY OF THE INVENTION
• The present invention is implemented to solve the foregoing problems. It is therefore an object of the present invention to provide a cordless power transmission system, power transmission terminal and electrical appliance suitable for large scale data communications and radio power transmission, and capable of transmitting and receiving electric power stably without any malfunctions even from separate places, thereby making all electrical appliances in a room wireless, for example.[0006]
• According to a first aspect of the present invention, there is provided a cordless power transmission system comprising: at least one power transmission terminal connected to a network; at least one electrical appliance supplied with power from the power transmission terminal by electromagnetic waves; a network host connected to the network for managing the electrical appliance via the power transmission terminal; a default power transmitter installed in the power transmission terminal for transmitting default power to the electrical appliance by diffractive electromagnetic waves; a first data transceiver installed in the electrical appliance for receiving default power, and for transmitting unique data and required power intensity data to the power transmission terminal by diffractive electromagnetic waves; a second data transceiver installed in the power transmission terminal for receiving the unique data and required power intensity data from the electrical appliance, and for transmitting them to the network host; and a power transmitter installed in the power transmission terminal for transmitting ID data to be assigned to the electrical appliance and power with a required intensity to the electrical appliance by rectilinear electromagnetic waves, wherein the network host obtains the ID data to be assigned to the electrical appliance from the unique data of the electrical appliance, and obtains the required intensity of the power to be transmitted from the power transmission terminal from-the required power intensity data sent from the electrical appliance.[0007]
• Here, the first data transceiver may continuously transmit the ID data, which is assigned to the electrical appliance by the network host, to the power transmission terminal by the diffractive electromagnetic waves while the electrical appliance is in a normal operation mode, and the second data transceiver may notify the network host of the ID data received by the power transmission terminal.[0008]
• The cordless power transmission system may further comprise a plurality of power transmission terminals, each of which includes a data collector for collecting intensity data of the electromagnetic waves arriving at the power transmission terminal from the electrical appliance, wherein the network host may obtain a 3-D position of the electrical appliance from the intensity data of the electromagnetic waves collected by the power transmission terminals, and assigns a part of the required intensity power to each of the power transmission terminals.[0009]
• The cordless power transmission system may comprise at least two power transmission terminals, each of which includes a reflectance detector for detecting reflectance of the rectilinear electromagnetic waves while the power transmission terminals are transmitting required power by the rectilinear electromagnetic waves, and the second data transceiver of each of the power transmission terminals may notify the network host of the reflectance, wherein the network host has the power transmission terminals other than the power transmission terminal whose reflectance of the electromagnetic waves varies substantially, transmit the required power.[0010]
• The network host may be installed in each room, and the network hosts may be interconnected by a cable to exchange data between the rooms.[0011]
• The network hosts may be connected to an external communication circuit via a fire wall.[0012]
• The diffractive electromagnetic waves may consist of radio waves; and the rectilinear electromagnetic waves may consist of light waves.[0013]
• The power transmitter of the power transmission terminal may convert AC power into light power with the required intensity, transmit it to the electrical appliance by light waves, and carry out information communication with the electrical appliance by the light waves; the default power transmitter may convert the AC power into radio power, and transmit the default power to the electrical appliance by the radio waves; and the second data transceiver may carry out information communication with the electrical appliance by the radio waves.[0014]
• The electrical appliance may further comprise: a light section for converting light power transmitted from the power transmission terminal into electric power, and for carrying out information communication with the power transmission terminal by light waves, wherein the first data transceiver may convert the radio power transmitted from the power transmission terminal into electric power, and carry out information communication with the power transmission terminal by the radio waves.[0015]
• According to a second aspect of the present invention, there is provided a power transmission terminal that supplies power to an electrical appliance by electromagnetic waves in accordance with a command sent from a network host connected to a network, the power transmission terminal comprising: a default power transmitter for supplying the electrical appliance by diffractive electromagnetic waves; a data transceiver for receiving unique data and required power intensity data associated with the electrical appliance from the electrical appliance by diffractive electromagnetic waves, and notifies these data to the network host; and a power transmitter for transmitting ID data and power with a required intensity to the electrical appliance by rectilinear electromagnetic waves, the ID data and the required intensity of the power being assigned to the electrical appliance and to the power transmission terminal, respectively, by the network host.[0016]
• According to a third aspect of the present invention, there is provided an electrical appliance that receives power by electromagnetic waves transmitted from a power transmission terminal connected to a network host through a network, the electrical appliance comprising: a default power receiver for receiving default power from the power transmission terminal by diffractive electromagnetic waves; a data transmitter for transmitting unique data and required power intensity data associated with the electrical appliance to the power transmission terminal by diffractive electromagnetic waves; and a power receiver for receiving ID data and power with a required intensity from the power transmission terminal by rectilinear electromagnetic waves, the ID data and the required intensity of the power being assigned to the electrical appliance and to the power transmission terminal, respectively, by the network host.[0017]
BRIEF DESCRIPTION OF THE DRAWINGS
• FIG. 1 is a block diagram showing an entire configuration of a cordless power transmission system of an[0018]embodiment 1 in accordance with the present invention;
• FIG. 2 is a block diagram showing a configuration of a power transmission terminal of the[0019]embodiment 1 in accordance with the present invention;
• FIG. 3 is a block diagram showing a configuration of an electrical appliance of the[0020]embodiment 1 in accordance with the present invention;
• FIGS.[0021]4A-4C are diagrams illustrating operation modes of the cordless power transmission system of theembodiment 1 in accordance with the present invention;
• FIGS.[0022]5A-5C are diagrams illustrating detection of a 3-D position of an electrical appliance in anembodiment 2 in accordance with the present invention;
• FIGS. 6A and 6B are block diagrams illustrating an operation when a radio communication is interrupted by an obstacle in an[0023]embodiment 3 in accordance with the present invention;
• FIG. 7 is a view illustrating a case where a cordless power transmission system of the[0024]embodiment 3 in accordance with the present invention is applied to electric appliances in a room; and
• FIG. 8 is a perspective view showing an entire configuration of a cordless power transmission system of an[0025]embodiment 4 in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
• The invention will now be described with reference to the accompanying drawings.[0026]
• [0027]Embodiment 1
• FIG. 1 is a block diagram showing an entire configuration of a cordless power transmission system of an[0028]embodiment 1 in accordance with the present invention. In FIG. 1, eachreference numeral1 designates a power transmission terminal connected to a network;2 designates an electrical appliance that operates by receiving power from one or morepower transmission terminals1; and3 designates a network host connected with thepower transmission terminals1 through the network.
• FIG. 2 is a block diagram showing a configuration of the[0029]power transmission terminal1 of thepresent embodiment 1. In FIG. 2, thereference numeral10 designates a light section for supplying power to theelectrical appliance2 by light waves, and exchanges necessary information with theelectrical appliance2 by the light waves; and20 designates a radio section for supplying power to theelectrical appliance2 by radio waves, and exchanges necessary information with theelectrical appliance2 by radio waves.
• In the[0030]light section10,11 designates a controller for controlling theentire light section10;12 designates an electric/light power converter for converting AC power supplied from a power company into light power with the intensity required by theelectrical appliance2;13 designates an optical communication section for exchanging communications of necessary information with theelectrical appliance2 by the light waves; and14 designates an optical transceiver for combining the light power fed from the electric/light power converter12 with the information fed from theoptical communication section13 to send them to theelectrical appliance2, and for receiving the optical information transmitted from theelectrical appliance2 to supply it to theoptical communication section13. Theoptical transceiver14 can control the direction of its emitting light.
• In the[0031]radio section20, thereference numeral21 designates a controller for controlling theentire radio section20;22 designates an electric/radio power converter for converting AC power supplied from the power company into radio power;23 designates a radio communication section for exchanging communications of necessary information with theelectrical appliance2 by radio waves; and24 designates a radio transceiver for combining the radio power fed from the electric/radio power converter22 with the information fed from theradio communication section23 to send them to theelectrical appliance2, and for receiving the information transmitted from theelectrical appliance2 by radio waves to supply it to theradio communication section23.
• The[0032]controller11 andoptical communication section13 in thelight section10, and thecontroller21 andradio communication section23 in theradio section20 are connected to thenetwork host3 by wire to undergo control by thenetwork host3.
• FIG. 3 is a block diagram showing a configuration of an electrical appliance of the[0033]embodiment 1. In FIG. 3, thereference numeral30 designates a light section for receiving power transmitted from thepower transmission terminal1 by the light waves, and for exchanging necessary information with thepower transmission terminal1 by light waves;40 designates a radio section for receiving power transmitted from thepower transmission terminal1 by the radio waves, and for exchanging necessary information with thepower transmission terminal1 by radio waves; and50 designates a load of theelectrical appliance2 including a CPU and a memory.
• In the[0034]light section30, thereference numeral31 designates a controller for controlling theentire light section30;32 designates a light/electric power converter for converting the light power transmitted from thepower transmission terminal1 into electric power;33 designates an optical communication section for exchanging necessary information with thepower transmission terminal1 by the light waves; and34 designates an optical transceiver for receiving the optical power and information from thepower transmission terminal1 and dividing them, and for transmitting the information fed from theoptical communication section33 to thepower transmission terminal1.
• In the[0035]radio section40, thereference numeral41 designates a controller for controlling theentire radio section40;42 designates a radio/electric power converter for converting the radio power transmitted from thepower transmission terminal1 into electric power;43 designates a radio communication section for exchanging necessary information with thepower transmission terminal1 by the radio waves; and44 designates a radio transceiver for receiving the radio power and information from thepower transmission terminal1 and dividing them, and for transmitting the information fed from theradio communication section43 to thepower transmission terminal1.
• Normally, the[0036]power transmission terminal1 carries out the main power transmission/information communication to theelectrical appliance2 by rectilinear light waves, and auxiliary power transmission/information communication by diffractive radio waves. This is because the optical power transmission/information communication is carried out for specificelectrical appliance2, whereas the radio power transmission/information communication is for generalelectrical appliances2. Suitably using the rectilinear light waves and diffractive radio waves-separately in accordance with the purposes can prevent the malfunction of the multipleelectrical appliances2 in the cordless power transmission system.
• The[0037]network host3 analyzes the information sent from thepower transmission terminals1, and integrally controls the specificpower transmission terminal1 or all thepower transmission terminals1. Thus connecting the plurality ofpower transmission terminals1 via the network by thenetwork host3 can implement various desired functions through communications between thepower transmission terminals1 and theelectrical appliances2 by the electromagnetic waves.
• Next, the operation of the[0038]present embodiment 1 will be described.
• FIGS.[0039]4A-4C are diagrams illustrating operation modes of the cordless power transmission system of theembodiment 1 in accordance with the present invention. First, as illustrated in FIG. 4A, thepower transmission terminal1 continuously transmits default power by the radio waves from theradio transceiver24 in theradio section20. The default power is set at such a low level that it can only activate theradio section40 in theelectrical appliance2. Theelectrical appliance2 operates the clock in theradio section40 by converting the radio power into the electric power, or by utilizing radio resonance without converting, thereby entering a standby mode.
• Subsequently, as illustrated in FIG. 4B, when the[0040]electrical appliance2 is switched on from the standby mode by a user, theradio section40 is partially turned on, and theelectrical appliance2 transmits its unique data and required power intensity data to unspecifiedpower transmission terminals1. More specifically, the radio-communication section43 transmits the unique data such as an article code, maker name and product code along with the required power intensity data to the unspecificpower transmission terminals1 by radio waves, via theradio transceiver44, under the control of thecontroller41.
• Subsequently, receiving the unique data and required power intensity data from the[0041]electrical appliance2 as illustrated in FIG. 4C, thepower transmission terminal1 transmits them to thenetwork host3 using theradio communication section23 in theradio section20. Thenetwork host3 assigns an ID (identifier) to theelectrical appliance2, and commands thepower transmission terminal1 to transmit the assigned ID data and power with the required intensity to theelectrical appliance2 through theoptical transceiver14 in thelight section10. In this case, the ID data is output from theoptical communication section13 and the power with the required intensity is output from the electric/light power converter12 under the control of thecontroller11, to be combined by theoptical transceiver14.
• The[0042]electrical appliance2 receives the light beam from thepower transmission terminal1 with theoptical transceiver34 in thelight section30, and decomposes it into data light and power light beam. The light/electric power converter32 converts the power light beam to electric power, and supplies it to theload50 as normal operation power. Thus, theelectrical appliance2 is switched on in its entirety, and continuously transmits the ID data sent from thenetwork host3 back to thenetwork host3 by the radio waves via thepower transmission terminal1 in order to notify of the location of theelectrical appliance2 itself. The ID data can be defined using the frequency differences in the radio waves.
• Transmission of image data from a first[0043]electrical appliance2 to a secondelectrical appliance2, for example, can be carried out as follows in the cordless power transmission system. The image data from the firstelectrical appliance2 is transmitted to a firstpower transmission terminal1 from theoptical communication section33 to theoptical communication section13 that transmits the light power to the firstelectrical appliance2. The image data transmitted to the firstpower transmission terminal1 is further transmitted, under the control of thenetwork host3, to theoptical communication section13 of the secondpower transmission terminal1 that transmits the light power to the secondelectrical appliance2. Then, the image data is transmitted from theoptical communication section13 of the secondpower transmission terminal1 to the secondelectrical appliance2 by light waves, to be received by theoptical communication section33 of the secondelectrical appliance2.
• Utilizing such a route makes it possible for the first and second[0044]electrical appliances2 to exchange image data even though they take positions where they cannot communicate directly by the light waves.
• Although the[0045]present embodiment 1 carries out the main power transmission/information communication by light waves, it can be achieved by any rectilinear electromagnetic waves. In addition, any electromagnetic waves can be used for the auxiliary power transmission/information communication as long as they are diffractive waves. Moreover, as for the AC power supplied from the power company, it can be supplied by light in the future.
• As described above, according to the[0046]present embodiment 1, thepower transmission terminal1 transmits power to theelectrical appliance2 by light waves and radio waves. This offers an advantage of being able to make theelectrical appliance2 cordless. In addition, the power transmission/information communication between the specificpower transmission terminal1 and specificelectrical appliance2 is carried out by the rectilinear light waves, and the power transmission/information communication between the generalpower transmission terminals1 and the generalelectrical appliances2 is carried out by the diffractive radio waves. This offers an advantage of being able to operate all theelectrical appliances2 stably by a single system without any malfunctions.
• [0047]Embodiment 2
• The entire configuration of the cordless power transmission system, the configuration of each[0048]power transmission terminal1 and that of eachelectrical appliance2 of thepresent embodiment 2 are the same as their counterparts of theembodiment 1 as shown in FIGS.1-3. Thepresent embodiment 2 is characterized in that itspower transmission terminals1 are installed on a ceiling of a room or the like.
• Next, the operation of the[0049]present embodiment 2 will be described.
• FIGS.[0050]5A-5C are diagrams illustrating detection of the 3-D position of an electrical appliance in thepresent embodiment 2. First, as illustrated in FIG. 5A, theelectrical appliance2 receives the default power radio waves from the plurality ofpower transmission terminals1, and is switched on as in the foregoingembodiment 1.
• Subsequently, as illustrated in FIG. 5B, while the[0051]electrical appliance2 transmits its own unique data or ID data by radio waves, thenetwork host3 has the plurality ofpower transmission terminals1 to collect incoming radio wave intensity data, and calculates the 3-D position of theelectrical appliance2 from the radio wave intensity data measured at least three points. Here, the radio wave intensity data are collected by theradio transceiver24,radio communication section23 andcontroller21 in each of thepower transmission terminals1, and are transmitted from theradio communication section23 to thenetwork host3.
• After that, as illustrated in FIG. 5C, calculating the 3-D position of the[0052]electrical appliance2 from the radio wave intensity data sent from thepower transmission terminals1, thenetwork host3 assigns respective parts of the power intensity required by theelectrical appliance2 to a fewpower transmission terminals1 close to the calculated 3-D position, and commands them to emit light beams separately. In this case, theoptical transceiver14 of eachpower transmission terminal1 turns the launching direction of the emitted light toward theelectrical appliance2. The reason for distributing the required power to the multiplepower transmission terminals1 is to prevent a singlepower transmission terminal1 from emitting high intensity light, and to take countermeasures against communication interference. The light powers of the individualpower transmission terminals1 are calculated by thenetwork host3.
• As described above, the[0053]present embodiment 2 is configured such that thenetwork host3 calculates the 3-D position of theelectrical appliance2. This offers an advantage of being able to launch the power in optimum directions toward theelectrical appliance2 so that the power transmission can be carried out following the movement of theelectrical appliance2.
• [0054]Embodiment 3
• The entire configuration of the cordless power transmission system, the configuration of each[0055]power transmission terminal1 and that of eachelectrical appliance2 of thepresent embodiment 3 are the same as their counterparts of theembodiment 1 as shown in FIGS.1-3. Thepresent embodiment 3 is characterized in that itspower transmission terminals1 are mounted on a ceiling of a room or the like.
• Next, the operation of the[0056]present embodiment 3 will be described.
• FIGS. 6A and 6B are block diagrams illustrating an operation when a radio communication is interrupted by an obstacle in the[0057]present embodiment 3, and FIG. 7 is a view illustrating a case where the cordless power transmission system of theembodiment 3 is applied to electric appliances in a room. As illustrated in FIG. 6A, launching a light beam, eachpower transmission terminal1 detects its reflectance on the surface of anelectrical appliance2 or the like, and notifies thenetwork host3 of the reflectance. The reflectance is detected by theoptical transceiver14,optical communication section13 andcontroller11 in eachpower transmission terminal1, and is transmitted from theoptical communication section13 to thenetwork host3.
• When the reflectance changes sharply, the[0058]network host3 considers the sudden change in the reflectance is brought about by the interference with the power light beam and radio waves caused by an obstacle as shown in FIGS. 6B and 7. Thus, thenetwork host3 instructs anotherpower transmission terminal1 which receives the ID data radio-waves from theelectrical appliance2 to emit a power light beam.
• Thus, the[0059]network host3, monitoring and managing the system, carries out the light power transmission/optical communication with theelectrical appliance2 through the optimum routes from thepower transmission terminals1.
• As described above, the[0060]present embodiment 3 is configured such that it continues the light power transmission/optical communication using the substitutepower transmission terminal1 when the current communication path is interrupted. Accordingly, it offers an advantage of being able to minimize the power variations and communication interruption.
• [0061]Embodiment 4
• Although the configurations of the[0062]power transmission terminal1 andelectrical appliance2 in thepresent embodiment 4 are the same as those of theembodiment 1 as shown in FIGS. 2 and 3, the cordless power transmission system is installed in each room of a building in thepresent embodiment 4.
• FIG. 8 is a perspective view showing an entire configuration of a cordless power transmission system of the[0063]embodiment 4 in accordance with the present invention, in which the cordless power transmission system in each room is the same as that of theembodiment 1 as shown in FIG. 1. In FIG. 8, the network hosts3 in the individual rooms are interconnected through optical fibers which are connected to external optical fibers constituting an external telephone line and a power line through afire wall4.
• Next, the operation of the[0064]present embodiment 4 will be described.
• Utilizing wireless media such as light waves for the power transmission and data communications and microwaves for the default power transmission and 3-D position detection, and carrying out fiber communications between the network hosts[0065]3 in the individual rooms, the cordless power transmission system of thepresent embodiment 4 exchanges image data and the like. In addition, the network hosts3 communicate with external equipment through thefiber wall4 to undergo the external remote control.
• As described above, since the[0066]present embodiment 4 combines the advantages of the wire and wireless media, it offers an advantage of being able to implement communications across the rooms or communications with the outside, such as image data transfer and remote control.
• Furthermore, employing the cordless power transmission system as an infrastructure for the high-speed communications with the outside can implement high-speed radio data communications inside and outside the rooms. In addition, the infrastructure is applicable to other purposes. For example, a security system can be implemented by monitoring the movement and temperature of an obstacle by the network hosts[0067]3 using the very weak radio waves emitted from the plurality ofpower transmission terminals1.

Claims (11)

What is claimed is:

1. A cordless power transmission system comprising:

at least one power transmission terminal connected to a network;

at least one electrical appliance supplied with power from said power transmission terminal by electromagnetic waves;

a network host connected to the network for managing said electrical appliance via said power transmission terminal;

a default power transmitter installed in said power transmission terminal for transmitting default power to said electrical appliance by diffractive electromagnetic waves;

a first data transceiver installed in said electrical appliance for receiving default power, and for transmitting unique data and required power intensity data to said power transmission terminal by diffractive electromagnetic waves;

a second data transceiver installed in said power transmission terminal for receiving the unique data and required power intensity data from said electrical appliance, and for transmitting them to said network host; and

a power transmitter installed in said power transmission terminal for transmitting ID data to be assigned to said electrical appliance and power with a required intensity to said electrical appliance by rectilinear electromagnetic waves,

wherein said network host obtains the ID data to be assigned to said electrical appliance from the unique data of said electrical appliance, and obtains the required intensity of the power to be transmitted from said power transmission terminal from the required power intensity data sent from said electrical appliance.

2. The cordless power transmission system according toclaim 1, wherein said first data transceiver continuously transmits the ID data, which is assigned to said electrical appliance by said network host, to said power transmission terminal by the diffractive electromagnetic waves while said electrical appliance is in a normal operation mode, and

said second data transceiver notifies said network host of the ID data received by said power transmission terminal.

3. The cordless power transmission system according toclaim 2, further comprising a plurality of power transmission terminals, each of which includes a data collector for collecting intensity data of the electromagnetic waves arriving at said power transmission terminal from said electrical appliance, wherein said network host obtains a 3-D position of said electrical appliance from the intensity data of the electromagnetic waves collected by said power transmission terminals, and assigns a part of the required intensity power to each of said power transmission terminals.

4. The cordless power transmission system according toclaim 1, comprising at least two power transmission terminals, each of which includes a reflectance detector for detecting reflectance of the rectilinear electromagnetic waves while said power transmission terminals are transmitting required power by the rectilinear electromagnetic waves, and said second data transceiver of each of said power transmission terminals notifies said network host of the reflectance, wherein said network host has the power transmission terminals other than the power transmission terminal whose reflectance of the electromagnetic waves varies substantially, transmit the required power.

5. The cordless power transmission system according toclaim 1, wherein said network host is installed in each room, and the network hosts are interconnected by a cable to exchange data between the rooms.

6. The cordless power transmission system according toclaim 5, wherein said network hosts are connected to an external communication circuit via a fire wall.

7. The cordless power transmission system according toclaim 1, wherein the diffractive electromagnetic waves consist of radio waves; and the rectilinear electromagnetic waves consist of light waves.

8. The cordless power transmission system according toclaim 7, wherein

said power transmitter of said power transmission terminal converts AC power into light power with the required intensity, transmits it to said electrical appliance by light waves, and carries out information communication with said electrical appliance by the light waves;

said default power transmitter converts the AC power into radio power, and transmits the de fault power to said electrical appliance by the radio waves; and

said second data transceiver carries out information communication with said electrical appliance by the radio waves.

9. The cordless power transmission system according toclaim 7, wherein said electrical appliance further comprises:

a light section for converting light power transmitted from said power transmission terminal into electric power, and for carrying out information communication with said power transmission terminal by light waves, and wherein

said first data transceiver converts the radio power transmitted from said power transmission terminal into electric power, and carries out information communication with said power transmission terminal by the radio waves.

10. A power transmission terminal that supplies power to an electrical appliance by electromagnetic waves in accordance with a command sent from a network host connected to a network, said power transmission terminal comprising:

a default power transmitter for supplying said electrical appliance by diffractive electromagnetic waves;

a data transceiver for receiving unique data and required power intensity data associated with said electrical appliance from said electrical appliance by diffractive electromagnetic waves, and notifies these data to said network host; and

a power transmitter for transmitting ID data and power with a required intensity to said electrical appliance by rectilinear electromagnetic waves, the ID data and the required intensity of the power being assigned to said electrical appliance and to said power transmission terminal, respectively, by said network host.

11. An electrical appliance that receives power by electromagnetic waves transmitted from a power transmission terminal connected to a network host through a network, said electrical appliance comprising:

a default power receiver for receiving default power from said power transmission terminal by diffractive electromagnetic waves;

a data transmitter for transmitting unique data and required power intensity data associated with said electrical appliance to said power transmission terminal by diffractive electromagnetic waves; and

a power receiver for receiving ID data and power with a required intensity from said power transmission terminal by rectilinear electromagnetic waves, the ID data and the required intensity of the power being assigned to said electrical appliance and to said power transmission terminal, respectively, by said network host.

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