JP2005168233A - Power supply floor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power supply floor capable of achieving connection of a plurality of feeding electrodes displaced on a floor surface with a power supply corresponding to contact with receiving electrodes of an electric appliance on the floor surface which requires for power supply, and capable of expediting high safety without any danger of electricity leakage, shortage, nor electrification. <P>SOLUTION: This power supply floor is constituted out of feeding poles 3 disposed at the floor surface 2, a under-floor wiring 9 having a power line 10, and a selector 4 which connects the feeding poles 3 with the under-floor wiring 9 so as to be switched. The selector 4 switches a built-in switching point 8 by contact between the feeding poles 3 and receiving poles 16 of the on-floor object 13 corresponding to a power supply demand signal from the on-floor object 13, the feeding poles 3 which are brought into contact with the receiving poles 16 are connected with the power line 10 to achieve power supply to the on-floor object 13. Because the other feeding poles 3 are not connected with the power line 10, it is thus possible to eliminate dangers of electricity leakage, shortage, and electrification. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a power supply floor that wirelessly supplies power to an electrical product located on a floor surface.

  Power supply to electrical appliances that are household electrical appliances such as TVs and personal computers is achieved by connecting the electrical outlet with a wall outlet using a cable. There was a complaint that the length of the cable was limited, the pattern could not be flexibly changed, and the cable always attached to the electrical product sometimes interfered with handling and appearance.

  In addition, dissatisfaction that mobile electric products such as robots, various movable carts, and automatic vacuum cleaners operate using the mounted heavy and bulky battery as a power source, so there is an unsatisfactory limit in reducing the size and weight. was there.

In order to eliminate this dissatisfaction, a large number of electrode plates are arranged at predetermined intervals on the floor, and each of these electrode plates is alternately changed in polarity and connected to a power source so that the electrical products on the floor can be used. A plurality of electrode elements insulated from each other are provided, and in this electrode element, some electrode elements are in contact with one polarity electrode plate, and at the same time, some other electrode elements are in contact with the other polarity electrode plate. Arranged so that the distance between the electrode plates is larger than the contact range of the electrodes so that one electrode does not contact two electrode plates of different polarities at the same time. A floor capable of wirelessly supplying power to electrical appliances is disclosed.
Japanese Patent Publication No.2-160990

  However, in the above-described prior art, a large number of electrode plates arranged on the floor surface remain connected to the power source, and therefore other than the target electrical product on the floor surface. In addition to the risk of electrical leakage and short circuit accidents, there is a risk that humans may get an electric shock as it is, and there is a problem that it cannot be used in ordinary homes or offices.

  Therefore, the present invention was devised to solve the above-described problems in the prior art, and the connection to the power source of a large number of electrode plates (power transmission electrodes) arranged on the floor surface is required for power supply. To provide a power supply floor that exhibits high safety without any risk of electric leakage, short-circuit accidents, or electric shock, with the technical challenge of achieving this by following the contact with the electrode (receiving electrode) of the electrical product on the surface. For the purpose.

Among the present invention for solving the above technical problems, the configuration of the invention according to claim 1 is:
Having a large number of power transmission electrodes arranged at predetermined intervals on the floor surface of the floor body;
Having underfloor wiring with at least a power line embedded in the floor body,
Having a selector for connecting the power transmission electrode and the underfloor wiring in an individually switchable manner;
The distance between each power transmission electrode is set such that adjacent power transmission electrodes are in contact with each other separately and simultaneously with a pair of power reception electrodes provided on an object on the floor, which is an electrical product located on the floor surface, and one power reception electrode is Set to a value that does not contact the two electrodes at the same time,
The selector switches the built-in switching contact according to the power supply request signal given from the object on the floor by the contact between the power transmission electrode and the power reception electrode, and connects the power transmission electrode in contact with the power reception electrode to the power line. ,
It is in.

  In the invention according to claim 1, each power transmission electrode is not connected to the power line unless an object on the floor is positioned on the floor surface, the power reception electrode is brought into contact, and a predetermined power supply request signal is sent. Therefore, even if an object other than an object on the floor is placed on the floor surface and brought into contact with the floor surface, it does not cause an electric leakage or a short circuit.

  Since the object on the floor is located on the floor surface, the power receiving electrode of the object on the floor is generally located on the lower surface of the object on the floor so as not to interfere with other articles on the floor surface. For this reason, the power transmission electrode that is in contact with the power reception electrode, that is, the power transmission electrode connected to the power line is hidden under the object on the floor. Therefore, the power transmission electrode connected to the power line is not suitable for humans or other articles. It is very easy to make it impossible to make contact if necessary.

  Each power transmission electrode has a distance between a pair of power receiving electrodes of the object on the floor, such that adjacent power transmitting electrodes are in contact with each other separately and simultaneously, and one power receiving electrode is not in contact with two power transmitting electrodes at the same time. Because it is set, a plurality of power transmitting electrodes are not short-circuited by a single power receiving electrode, but a pair of power transmitting electrodes and power receiving electrodes are always in one-to-one contact at the same time. To achieve a stable power supply.

  The invention according to claim 2 selects the polarity of the power supply line to be switched and connected to the selector switching contact according to the polarity of the power supply request signal from the object on the floor in the configuration of the invention according to claim 1. That is,

  In the second aspect of the present invention, when the power source of the power supply line is a DC power source, it is possible to always supply power to the object on the floor with a constant polarity. It is not necessary to provide a device (rectifier) for trimming, and the structure of an operational floor object can be simplified.

  The invention described in claim 3 adds to the configuration of the invention described in claim 1 that the switching contact of the selector is switched and connected to a predetermined power line by a power supply request signal from an object on the floor. Is.

  In the invention according to claim 3, since the polarity of the electric power supplied to the object on the floor cannot be made constant, it is necessary to provide a rectifier as an operable object on the floor. Since the contacts need only be switched in a certain direction, their structure and operation are simple, which simplifies the structure of the entire floor.

  According to a fourth aspect of the present invention, in the configuration of the first, second, or third aspect, the underfloor wiring is composed of a power supply line and a ground line, and the power transmission electrode that is not in contact with the power reception electrode is grounded by the selector. It is added that it is supposed to be connected to a line.

  In this invention of Claim 4, the power transmission electrode which is not in contact with the power receiving electrode of the object on the floor, that is, the power transmission electrode which is not connected to the power line is connected to the ground line, and the electric influence from the power line is reduced. Since it is completely absent, the safety of the floor is made higher.

  The invention described in claim 5 is the configuration of the invention described in claim 1, 2, 3 or 4, in which a large number of power transmission electrodes having the same plate shape are arranged on the floor surface at equal intervals, and one power transmission electrode is provided. This is the addition of connecting two selectors.

  In the invention according to claim 5, since the polarity of each power transmitting electrode can be switched according to the power transmitting electrode combined adjacently, it is necessary to supply power with a constant polarity to the object on the floor. For example, it is suitable when the power source is a DC power source.

  The invention described in claim 6 is the configuration of the invention described in claim 1, 2, 3 or 4, wherein a power transmission electrode body is constituted by a first power transmission electrode and a second power transmission electrode which are adjacent to each other at regular intervals. The power transmission electrode bodies are arranged at equal intervals on the floor surface, and the first power transmission electrode and the second power transmission electrode of each power transmission electrode body are commonly connected to one selector. is there.

  In the invention according to claim 6, since the selector needs to connect two power transmission electrodes of one power transmission electrode body to different power lines at the same time, in order to avoid complication of the structure of the selector, It is advantageous to predetermine the power line to which each power transmission electrode is connected, and since power supply is achieved by contact with one power transmission electrode body, power supply to an object on the floor is easy, and smaller power reception is possible. Since power can be supplied from the electrodes, power can be supplied to a small object on the floor without any inconvenience.

  According to a seventh aspect of the present invention, in the configuration of the first, second, third, fourth, fifth or sixth aspect, the power supply request signal from the object on the floor is a current signal from a capacitor provided on the object on the floor, and the selector The switching contact, the current probe for detecting the power supply request signal, the discriminator for discriminating the direction of the current signal from the object on the floor according to the detection signal of the current probe, and the switching of the switching contact according to the discrimination of the discriminator And an electromagnetic relay for setting the position.

  In the invention described in claim 7, since the power supply request signal from the object on the floor is the current signal from the capacitor provided on the object on the floor, the power supply request signal always has directionality. By setting the switching position of the switching contact according to the directionality, the power supply to the object on the floor can always be achieved with a constant polarity.

  The invention described in claim 8 is the configuration of the invention described in claim 1, 2, 3, 4, 5 or 6, and a selector, a switching contact having one switching position, and a current signal from an object on the floor. The configuration includes a current probe that detects a power supply request signal and an electromagnetic relay that switches a switching contact according to the detection signal of the current probe.

  In the eighth aspect of the invention, since the selector has only one switching position of the switching contact, the switching contact is switched when the power supply request signal is detected regardless of the direction of the power supply request signal from the object on the floor. Since it is a thing, the structure becomes a very simple thing.

Since the present invention has the above-described configuration, the following effects can be obtained.
In the invention according to claim 1, only the one that is in contact with the power receiving electrode of the object on the floor and sent a predetermined electric signal among the many power transmitting electrodes is connected to the power line, and all the others are connected. Since it is at ground potential, even if an object other than an object on the floor is placed on the floor and comes in contact with the power transmission electrode, it will not cause an electric leakage or short circuit accident. There is nothing at all, and extremely high safety can be exhibited.

  Since the object on the floor is located on the floor surface, it is advantageous to maintain the contact of the power receiving electrode with the power transmitting electrode by utilizing the weight of the object on the floor, and the power receiving electrode can be attached to other articles on the floor surface. It is effective to position it on the lower surface of the object on the floor so that it does not disturb the power transmission electrode connected to the power line in contact with the power receiving electrode, which is hidden under the object on the floor. Therefore, it is easy to configure so as not to come into contact with a person or other articles as necessary, and thus safety can be further improved.

  In the invention of claim 2, since the selector selects the polarity of the power source to be connected according to the polarity of the load of the object on the floor connected to the power transmission electrode, the polarity of the power supplied to the object on the floor is selected. There is no need to provide a means for changing, and accordingly, the structure of the object on the floor when the DC power source is used can be simplified.

  In the invention of claim 3, the structure of the selector can be made the simplest, whereby the operation of the selector can be made stable and reliable, and the selector can be obtained at low cost. It is possible to keep the price of the entire floor low.

  In the invention described in claim 4, since the power transmission electrode not connected to the power line is connected to the ground line, it is always kept in a state where there is no electrical influence from the power line. Thus, the safety of the floor can be further increased.

  In the invention according to claim 5, since the polarity of each power transmission electrode can be switched according to the power transmission electrodes combined adjacently, power is supplied with a constant polarity to the object on the floor. For example, it is suitable when the power source is a DC power source, and the DC load can be operated safely.

  In the invention according to claim 6, since it is necessary to connect two power transmission electrodes of one power transmission electrode body to different power lines at the same time, a power line to which each power transmission electrode is connected is determined in advance. This makes it possible to simplify the structure of the selector, and because power supply is achieved by contact with a single power transmission electrode body, power supply to an object on the floor is easy, and the power reception electrode can be easily downsized. Therefore, power supply to a small floor object can be achieved without difficulty.

  In the invention according to claim 7, since the power supply request signal from the object on the floor is the current signal from the capacitor provided in the object on the floor, the power supply request signal always has directionality. It is easy to detect and discriminate the power supply request signal by the selector, which makes it possible to make the selector simple, stable and inexpensive, and according to the direction of the power supply request signal. By setting the switching position, the supply of power to the object on the floor can always be achieved with a constant polarity, and thus the supply of DC power to the object on the floor can be safely achieved.

  In the invention according to claim 8, since the switching contact of the selector has a two-point switching structure, the power supply request signal is detected regardless of the direction of the power supply request signal that is a current signal from the object on the floor. What is necessary is just to switch a switching contact, and while the structure of a selector becomes simple, operation | movement of a selector also becomes simple, Thereby, the whole floor body can be made cheap by simple structure.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a first embodiment of the present invention, in which a power transmission electrode 3 made of a conductive material and having a flat disk shape is arranged on a floor surface 2 of a floor body 1 at regular intervals. Each power transmission electrode 3 is connected to an underfloor wiring 9 including a power line 10 and a ground line 11 through a selector 4.

  The selector 4 detects in accordance with a switching contact 8 that switches and connects the power transmission electrode 3 to the underfloor wiring 9, a current probe 6 that detects a power supply request signal that is a current signal from the object 13 on the floor, and a detection signal of the current probe 6. The discriminator 5 discriminates the direction of the supplied power supply request signal, and the electromagnetic relay 7 switches and sets the connection position of the switching contact 8 according to the discrimination result of the discriminator 5.

  The selector 4 switches the connection position of the switching contact 8 in accordance with the direction of the power supply request signal from the floor object 13, so that the power receiving electrode 16 of the floor object 13 is not in contact with the power transmission electrode 3, that is, the floor object. In a state where there is no power supply request signal from 13, the switching contact 8 is positioned at a position where it is connected to the ground wire 11, which is a neutral position, thereby ensuring that the power transmission electrode 3 is connected to the ground wire 11.

Examples of use of this first embodiment are shown in FIGS.
In the first usage example shown in FIGS. 4 to 6, the object 13 on the floor can be driven on the floor 2 by rotating the traveling wheel 24 by a motor mounted as a part of the load 14 so as to be able to move on its own. In addition, the battery 15 includes an electric double layer capacitor, a small battery, and the like, and a pair of power receiving electrodes 16 are provided on the lower surface thereof so as to be in contact with the power transmitting electrodes 3 on the floor surface 2.

  As shown in FIG. 4, the object 13 on the floor causes a load 14 to be driven by power from a power source 12 that is a DC power source by bringing a pair of power receiving electrodes 16 into contact with a pair of adjacent power transmitting electrodes 3. While traveling, the battery 15 is charged.

  From this state, the movement of the object on the floor 13 proceeds, and as shown in FIG. 5, when the power receiving electrode 16 is separated from the power transmission electrode 3 and power is not supplied to the object on the floor 13 from the floor 1 side, the object on the floor 13 is The load 14 is driven by the electric power of the provided battery 15 to continue the self-propelled movement.

  On the other hand, the selector 4 of the floor body 1 senses that the current flow has ceased, returns the switching contact 8 to the neutral position, and connects the power transmission electrode 3 to the ground wire 11.

  From this state, the movement of the object 13 on the floor further proceeds and, as shown in FIG. 6, when the power receiving electrode 16 comes into contact with the power transmitting electrode 3 again, at the beginning of this contact, a part of the electric power of the battery 15 is received by one of the power receiving electrodes. It is discharged as a feed request signal through the path of electrode 16 → one power transmission electrode 3 → switching contact 8 of selector 4 → ground wire 11 → switching contact 8 of selector 4 → the other power transmission electrode 3 → the other power receiving electrode 16 The

  The selector 4 connected to the power transmitting electrode 3 on the right side in the drawing by contact with the power receiving electrode 16 detects a current signal from the object 13 on the floor toward the ground wire 11, that is, a power supply request signal. Since the contact 4 is switched to the positive pole side of the power supply line 10, and the selector 4 connected to the left power transmission electrode 3 on the contrary detects the power supply request signal from the ground wire 11 to the object 13 on the floor, the switching contact is switched accordingly. 8 is switched to the negative pole side of the power line 10.

  By achieving the switching of the switching contact 8 of the selector 4, the supply of power from the power source 12 to the object on the floor 13 is resumed with a polarity suitable for the polarity of the battery 15.

    7 and 8 show a second embodiment of the present invention, in which a power transmitting electrode 3 in the shape of a flat disk made of a conductive material arranged and arranged on the floor surface 2 of the floor body 1 at regular intervals. Each power transmission electrode 3 is connected to an underfloor wiring 9 including a power line 10 and a ground line 11 via a selector 4.

  The selector 4 switches according to a switching contact 8 for switching the power transmission electrode 3 to the underfloor wiring 9, a current probe 6 for detecting a power supply request signal which is a current signal from the object 13 on the floor, and a detection signal of the current probe 6. The electromagnetic relay 7 is configured to switch the contact 8 to a single contact.

  Since the selector 4 switches the switching contact 8 to a contact provided with only one switching contact 8 in accordance with the power supply request signal from the floor object 13, the power receiving electrode 16 of the floor object 13 is not in contact with the power transmission electrode 3. That is, in the state where there is no power supply request signal from the object 13 on the floor, the switching contact 8 is positioned at a position where it is connected to the ground wire 11 which is the neutral position, thereby ensuring that the power transmission electrode 3 is connected to the ground wire 11. .

Examples of use of this second embodiment are shown in FIGS.
In the usage example of the second embodiment shown in FIGS. 9 to 12, the power source 12 is a single-phase AC power source, and the floor top object 13 used in the usage example of the first embodiment is made corresponding to this. , A rectifier 17 configured as a full-wave rectifier circuit by bridge-connecting four diodes, and a power supply request signal including a series circuit of a signal capacitor 19 and a signal rectifier 20 between the power receiving electrodes 16 as a main component. Is additionally provided.

  The signal generation circuit 18 charges a part of the power from the power source 12, which is an AC power source, to a certain polarity by the signal rectifier 20 and charges the signal capacitor 19. The movement of the object 13 on the floor causes the power receiving electrode 16 to transmit power. At the beginning of contact with the electrode 3, the charging power of the signal capacitor 19 is sent to the selector 4 as a power supply request signal.

  FIG. 10 shows a specific example of the signal generation circuit 18. A current limiting limiting resistor 23 is connected in series with the series circuit of the signal capacitor 19 and the signal rectifier 20, and the signal rectifier 20 The switch 21 is connected in parallel, and an excitation coil 22 that excites the switch 21 is connected in parallel with the series circuit of the signal capacitor 19 and the signal rectifier 20.

  The switch 21 is a normally closed contact type and is turned off when the exciting coil 22 is excited. Therefore, the switch 21 is turned off when power is supplied from the power source 12 to the object 13 on the floor. Thus, the signal capacitor 19 is charged with electric power having the polarity shown in FIG.

  When the power receiving electrode 16 moves away from the power transmitting electrode 3 and the supply of power from the power source 12 to the object on the floor 13 is stopped, the exciting power of the exciting coil 22 is lost, so that the switch 21 is turned on and the signal capacitor 19 is charged at any time. The power can be discharged as a power supply request signal.

  The exciting coil 22 can be connected in parallel with the series circuit of the signal capacitor 19, the signal rectifier 20, and the limiting resistor 23. However, the combination of the switch 21 and the exciting coil 22 is constituted by a reed switch. In view of the safety of the reed switch, the illustrated connection structure is preferable.

  The limiting resistor 23 not only limits the current but also sets and controls the discharge time constant of the signal capacitor 19, and prevents the charged charge of the signal capacitor 19 from being discharged instantly.

  In the state shown in FIG. 9, the floor object 13 rectifies the power from the power source 12 by the rectifier 17, and drives the load 14, which is a DC load, with this rectified power to continue traveling and charge the capacitor 15. Further, the signal capacitor 19 of the signal generation circuit 18 is charged with electric power.

  If the traveling movement of the object 13 on the floor progresses and the power receiving electrode 16 moves away from the power transmitting electrode 3 as shown in FIG. 11, the object on the floor 13 is connected to the capacitor 15 as in the case of the usage example of the first embodiment. The switching contact 8 that has continued to travel only with electric power and has been connected to the power supply line 10 is switched and connected to the ground wire 11.

  Then, as shown in FIG. 12, when the power receiving electrode 16 contacts the power transmitting electrode 3 again, the current signal from the signal capacitor 19 of the signal generation circuit 18 is supplied to the power receiving electrode 16 as a power supply request signal from the object 13 on the floor. Since the current flows through both connected power transmission electrodes 3, a power supply request signal flows to the selector 4 connected to the power transmission electrode 3, and the switching contact 8 of the selector 4 is connected to the power supply line 10 side.

  Thus, power supply from the power source 12 to the floor object 13 is resumed, the load 14 is operated, and the capacitor 15 and the signal capacitor 19 are charged.

  When the power source 12 is a DC power source, as shown in FIG. 13, the underfloor wiring 9 can be configured by only the power source line 10 by omitting the ground wire 11. The switching contact 8 of the selector 4 of the power transmission electrode 3 that is not in contact with the electrode 16 is connected to the negative power line 10, and the power transmission electrode 3 that is in contact with the power reception electrode 16 connected to the positive side of the battery 15. Only the switching contact 8 of the selector 4 is connected to the power supply line 10 on the plus side.

  FIGS. 14 to 16 show a third embodiment of the present invention, in which a first power transmission electrode 3a having a flat disk shape made of a conductive material and a conductive material surrounding the first power transmission electrode 3a are shown. A power transmission electrode body 3 ′ is configured from the second power transmission electrode 3 b having a flat ring plate shape, and the first power transmission electrode 3 a and the second power transmission electrode 3 b are connected to one selector 4.

  In the third embodiment, the distance between the first power transmission electrode 3a and the second power transmission electrode 3b is set to a value that is not short-circuited by one power reception electrode 16, and each power transmission electrode body 3 'is desired. They are arranged on the floor surface 2 of the floor body 1 at regular intervals.

  Since the selector 4 needs to switch and connect the first power transmission electrode 3a and the second power transmission electrode 3b to different power lines 10 at the same time, two switching contacts 8 are provided for one electromagnetic relay 7, Two switching contacts 8 are simultaneously switched by one electromagnetic relay 7, and both switching contacts 8 have a two-point switching structure, similar to the switching contacts 8 in the second embodiment. .

  FIG. 17 shows a usage example of the third embodiment, and is the same as the usage example of the second embodiment except for the combination structure of the power transmission electrode body 3 ′ and the selector 4. Power is supplied to each power transmission electrode body 3 ′ as a unit.

It is an external appearance perspective view of a unit floor body which shows the 1st example of the present invention. FIG. 2 is a schematic diagram of electrical connection showing an electrical configuration of the embodiment shown in FIG. 1. It is explanatory drawing which shows the electrical structure of the selector in the Example shown in FIG. It is operation | movement explanatory drawing of the DC power supply state with respect to the moving-floor object of a 1st Example. It is operation | movement explanatory drawing that the object on the moving floor moved from the state of FIG. FIG. 6 is an operation explanatory diagram in which an object on the moving floor has moved from the state of FIG. 5 to a power supply state. It is a procedure diagram of the electrical connection which shows the electrical structure of the 2nd Example of this invention. It is explanatory drawing which shows the electrical structure of the selector in the Example shown in FIG. It is operation | movement explanatory drawing of the alternating current power supply state with respect to the moving-floor object of a 2nd Example. It is a circuit diagram which shows one of the specific examples of a signal generation circuit. It is operation | movement explanatory drawing which the object on the moving floor moved from the state of FIG. It is operation | movement explanatory drawing which the object on the moving floor moved from the state of FIG. 11, and was in the electric power feeding state. It is operation | movement explanatory drawing at the time of the electric power feeding state which shows the other usage example of a 2nd Example. It is an external appearance perspective view of the unit floor body which shows the 3rd Example of this invention. FIG. 15 is a schematic diagram of electrical connection showing an example of use of the embodiment shown in FIG. 14. FIG. 16 is an explanatory diagram showing an electrical configuration of a selector in the embodiment shown in FIG. 15. It is operation | movement explanatory drawing of the alternating current power supply state with respect to the moving-floor object of a 3rd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1; Floor body 2; Floor surface 3; Power transmission electrode 3 '; Power transmission electrode body 3a; First power transmission electrode 3b; Second power transmission electrode 4; Selector 5; Discriminator 6; Current probe 7: Electromagnetic relay 8; ; Under-floor wiring 10; Power supply line 11; Earth line 12; Power supply 13; Top-floor object 14; Load 15; Capacitor 16; Power receiving electrode 17; Exciting coil 23; limiting resistance 24; traveling wheel

Claims (8)

  A number of power transmission electrodes (3) arranged at predetermined intervals on the floor surface (2) of the floor body (1), and an underfloor wiring having at least a power line (10) embedded in the floor body (1). (9) and a selector (4) for connecting the power transmission electrode (3) and the underfloor wiring (9) individually and switchably, and the distance between the power transmission electrodes (3) is determined on the floor surface ( 2) With respect to a pair of power receiving electrodes (16) provided on an object on the floor (13) that is an electrical product located above, the adjacent power transmitting electrodes (3) are in contact separately and simultaneously, and the one One receiving electrode (16) is set to a value that does not contact two power transmitting electrodes (3) at the same time, and the selector (4) is placed on the floor by contact between the power transmitting electrode (3) and the power receiving electrode (16). According to the power supply request signal given from the object (13), the built-in switching contact (8) is switched, and the power transmission electrode (3) in contact with the power receiving electrode (16) is connected to the power line (10) Power supply floor.   The electric power according to claim 1, wherein the switching contact (8) of the selector (4) selects the polarity of the power line (10) to be switched and connected in accordance with the polarity of the power supply request signal from the object on the floor (13). Supply floor.   The power supply floor according to claim 1, wherein the switching contact (8) of the selector (4) is switched and connected to a predetermined power line (10) by a power supply request signal from the object on the floor (13).   The underfloor wiring (9) consists of a power line (10) and a ground line (11), and the selector (4) connects the power transmission electrode (3) that is not in contact with the power reception electrode (16) to the ground line (11). The power supply floor according to claim 1, 2 or 3, wherein the power supply floor is connected to the power supply floor.   2. A large number of power transmission electrodes (3) having the same plate shape are arranged on a floor surface (2) at equal intervals, and one selector (4) is connected to each power transmission electrode (3). The electric power supply floor according to 2, 3, or 4.   The first power transmission electrode (3a) and the second power transmission electrode (3b) that are adjacent to each other at a constant interval constitute a power transmission electrode body (3 ′), and the multiple power transmission electrode bodies (3 ′) are connected to the floor surface (2 ) Arranged at equal intervals, and the first power transmission electrode (3a) and the second power transmission electrode (3b) of each power transmission electrode body (3 ′) are commonly connected to one selector (4). The power supply floor according to claim 1, 2, 3 or 4.   A selector (4), a switching contact (8) having two switching positions, a current probe (6) for detecting a power supply request signal which is a current signal from an object on the floor (13), and the current probe (6) The discriminator (5) for discriminating the direction of the power supply request signal according to the detection signal, and the electromagnetic for switching the switching contact (8) by selecting one of the switching positions according to the discriminator of the discriminator (5) The power supply floor according to claim 1, 2, 3, 4, 5 or 6, comprising a relay (7).   A selector (4), a switching contact (8) having one switching position, a current probe (6) for detecting a power supply request signal which is a current signal from an object on the floor (13), and the current probe (6) The power supply floor according to claim 1, 2, 3, 4, 5 or 6, comprising an electromagnetic relay (7) for switching the switching contact (8) in accordance with a detection signal.

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