JP2014017973A - Non-contact power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply system capable of reducing a number of primary coils and a number of high-frequency inverters so as to decrease cost.SOLUTION: Each primary side magnetic body core 11 wound with a primary coil L1, is arranged in parallel with a moving direction of a second coil L2 wound around a secondary side magnetic body core 21. Length in a moving direction of each primary side magnetic body core 11 wound with the primary coil L1 is assumed as length X1, an interval between the primary side magnetic body core 11 and the primary side magnetic body core 11 is assumed as length D, and length in the moving direction of the secondary side magnetic body core 21 is assumed as length X2. At that time, each primary side magnetic body core 11 and the secondary side magnetic body core 21 are disposed under a condition satisfying D≥2X1 and X2≥2X1+D.

Description

  The present invention relates to a non-contact power feeding system.

  Conventionally, in a non-contact power feeding system using an electromagnetic induction method, a plurality of primary coils of a power feeding device are arranged in parallel in one direction, and a secondary coil of a power receiving device is placed on each primary coil arranged in parallel in the one direction. A non-contact power feeding system to be moved has been proposed (for example, Patent Document 1). In this non-contact power feeding system, a plurality of secondary coils of a power receiving apparatus are arranged so as to be movable on each primary coil arranged in parallel in one direction. Then, secondary power is generated by electromagnetic induction between the secondary coil and a primary coil that generates an opposing magnetic field. As a result, when the power supply target is a mobile object, an electric cord that obstructs the movement of the mobile object can be omitted, and the merit of non-contact power supply is great.

JP 2011-2111874 A

  By the way, in patent document 1, since both a primary coil and a secondary coil are planar coils, a power feeding surface and a power receiving surface become wide. Therefore, if it is attempted to reduce the area of the planar primary coil and secondary coil in order to reduce the power feeding surface and the power receiving surface, the coil cannot be wound to a desired number of turns. Therefore, a primary coil and a secondary coil are formed with a thin wire. However, if the primary coil and the secondary coil are formed of thin wires, the coil is likely to generate heat.

  Moreover, in patent document 1, since it is the structure which arranged the several primary coil side by side in one direction without gap, there are many primary coils, and the high frequency which produces | generates the high frequency current supplied to a primary coil As many inverters as the number of primary coils must be provided, which increases the cost.

  The present invention has been made to solve the above-described problems, and its object is to provide a non-contact power supply that can reduce the number of primary coils and, accordingly, reduce the number of high-frequency inverters and realize cost reduction. To provide a system.

  In order to solve the above problems, a non-contact power feeding system according to the present invention includes a power feeding device in which a plurality of primary coils wound around a primary magnetic core are arranged in parallel in one direction, A plurality of primary coils in which a power receiving device having a secondary coil wound around a long secondary magnetic core is moved in the one direction, and the secondary magnetic cores are arranged in parallel in the one direction A high-frequency current is supplied to the primary coil, secondary power is generated in the secondary coil by an alternating magnetic field generated by the primary coil, and the secondary power is A non-contact power feeding system configured to supply to an electric device provided on the movable body, wherein the length of the primary magnetic core in one direction is X1, and the secondary magnetic core is in the one direction And the distance between the primary side magnetic core and the primary side magnetic core is D. And when, a D ≧ 2X1, to satisfy X2 ≧ 2X1 + D, were placed the primary magnetic core and the secondary magnetic core.

In the above configuration, the secondary magnetic core is preferably a C-type or I-type core.
In the above configuration, it is preferable that each of the plurality of primary coils includes a high-frequency inverter that supplies a high-frequency current to the primary coil.

In the above configuration, it is preferable that the primary coil and the secondary coil are connected in series or in parallel with resonance capacitors, respectively.
In the above configuration, it is preferable that a storage space for storing the electric device is formed in the moving body.

  Further, in the above configuration, the power feeding device is provided in a duck in a room, and the plurality of primary side magnetic cores wound with the primary coil are arranged in parallel along the duck. The moving body is a sliding door provided between the duck and the sill door, and the secondary side magnetic core around which the secondary coil of the power feeding device is wound moves the sliding door along the duck. At this time, the sliding door is preferably provided on the upper side of the sliding door so as to face each of the primary magnetic cores arranged in parallel to the headquarters.

  According to the present invention, the number of primary coils can be reduced, and accordingly, the number of high-frequency inverters can be reduced, thereby realizing cost reduction.

The perspective view of the sliding door for demonstrating the non-contact electric power feeding system in embodiment. The perspective view of the primary coil and secondary coil for demonstrating the non-contact electric power feeding system in embodiment. Similarly, (a)-(j) is explanatory drawing for demonstrating the coupling coefficient of a primary coil and a secondary coil. Similarly, the electrical block circuit diagram of a non-contact electric power feeding system. Similarly, the electrical circuit diagram of a high frequency inverter. The perspective view of the primary coil and secondary coil for demonstrating the non-contact electric power feeding system for demonstrating another example of this invention.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment embodying a non-contact power feeding system of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a sliding door 1 as a moving body is disposed between a duck 2 and a sill 3 in a room. The sliding door 1 is slidably supported between the position indicated by the solid line and the position indicated by the two-dot chain line in FIG.

  A power feeding device 10 is installed in the Kamoi 2. The power feeding apparatus 10 has a plurality of primary coils L1 wound around the primary side magnetic core 11. Each primary coil L1 wound around the primary side magnetic core 11 is arranged along a groove of the Kamoi 2 with a predetermined interval.

  As shown in FIG. 2, the primary magnetic core 11 is a so-called C-shaped core obtained by bending a quadrangular columnar magnetic body into a U-shape, and the primary coil L1 is a C-shaped 1 The secondary side magnetic core 11 is wound around an intermediate portion 11b that connects both side portions 11a.

  And the primary side magnetic body core 11 which wound the primary coil L1 is a groove | channel of the Kamoi 2, and is arrange | positioned at equal intervals along the moving direction of the sliding door 1 shown by the arrow in FIG. At this time, the primary-side magnetic core 11 is arranged such that the square end surface 11c of the both side portions 11a is opposed to the upper surface of the sliding door 1, and the line connecting the both side portions 11a is that of the sliding door 1. It arrange | positions so that it may orthogonally cross with respect to a moving direction.

  Here, the distance D when the primary-side magnetic cores 11 are arranged at equal intervals is the length X1 of the width of the primary-side magnetic core 11 (moving direction of the sliding door 1). At least twice the length X1 (D ≧ X1)).

  And each primary coil L1 wound by the primary side magnetic body core 11 arrange | positioned at equal intervals in the groove | channel of the Kamoi 2 is each the high frequency inverter 15 (FIG. 1) of the electric power feeder 10 provided for every primary coil. 4)), a high-frequency current is supplied.

The sliding door 1 supported so as to be movable between the duck 2 and the sill 3 is formed in a rectangular plate shape having a thickness of 40 mm made of, for example, wood, glass, plastic, or wall material.
A power receiving device 20 is installed in the sliding door 1. The power receiving device 20 includes a secondary coil L2 that is disposed along the moving direction and is wound around the secondary-side magnetic core 21 that is formed long along the moving direction.

  As shown in FIG. 2, the secondary-side magnetic core 21 is formed of the same material as the primary-side magnetic core 11, and its cross-sectional shape is the same as the cross-sectional shape of the primary-side magnetic core. The core of the mold. The secondary side magnetic core 21 is formed such that the length X2 in the moving direction is longer than the length X1 in the moving direction of the primary side magnetic core 11.

  And the secondary side magnetic body core 21 is arrange | positioned along the moving direction in the upper part fitted in the groove | channel of the Kamoi 2 of the sliding door 1. As shown in FIG. At this time, when the secondary magnetic core 21 moves the sliding door 1, the rectangular front end surface 21 c which is long in the moving direction of the both side portions 21 a of each primary magnetic core 11 provided in the Kamoi 2. It arrange | positions so that it may mutually oppose with the front end surface 11c of the both sides 11a.

  The secondary coil L2 is wound around an intermediate portion 21b that connects both side portions 21a of the C-type secondary-side magnetic core 21. The secondary coil L2 is supplied with a high frequency current to each primary coil L1 wound around the primary magnetic core 11 disposed along the Kamoi 2 and is subjected to secondary induction by electromagnetic induction based on the alternating magnetic field. Electric power is generated.

Here, the arrangement | positioning conditions of the several primary side magnetic body core 11 arrange | positioned along the Kamoi 2 and the secondary side magnetic body core 21 arrange | positioned at the sliding door 1 are demonstrated according to FIG.
Now, the length of each primary side magnetic core 11 in the moving direction is the length X1, and the distance between the primary side magnetic core 11 and the primary side magnetic core 11 is the length D. Further, the length in the moving direction of the secondary side magnetic core 21 is defined as a length X2.

At this time, the primary side magnetic cores 11 and the secondary side magnetic cores 21 are arranged so that D ≧ 2X1 and X2 ≧ 2X1 + D.
This condition is that the coupling coefficient K between the secondary coil L2 and the opposing primary coil L1 at that time is 0.15 regardless of the moving position of the sliding door 1 with respect to each primary magnetic core 11. That's it.

  This is because the primary coil L1 is generated based on the high-frequency current supplied to the primary coil L1 by the high-frequency inverter 15 of the power supply apparatus 10 for the secondary coil L2 provided in the sliding door 1 that reciprocates in one direction. This is a coupling coefficient K that enables power transmission in an alternating magnetic field.

3A to 3J are experimental examples in which the coupling coefficient K is 0.15 or more.
In order to facilitate the explanation, three primary side magnetic cores 11 are arranged in parallel in the moving direction.
The length X1 of each primary side magnetic core 11 in the moving direction is 30 mm, the distance D between the primary side magnetic core 11 and the primary side magnetic core 11 is 60 mm, and the secondary side magnetic core. The length X2 in the moving direction 21 is 120 mm.

  Then, the secondary magnetic core 21 is moved to the right from the state in which the secondary magnetic core 21 faces the primary magnetic core 11 located on the left side and the center shown in FIG. Move to. And it moves until the secondary side magnetic body core 21 directly opposes with respect to the primary side magnetic body core 11 located in the center and the right side shown in FIG.3 (j), and the primary coil L1 and secondary coil at that time The coupling coefficient K of L2 was determined. By this experiment, the results shown in Table 1 could be obtained.

  The coupling coefficient K at each position of the secondary coil L2 is the inductance Lo of the secondary coil L2 when each primary coil L1 is opened, and the secondary coil L2 when each primary coil L1 is short-circuited. Obtained by experiment with inductance Ls. And the coupling coefficient K in each position of the secondary coil L2 is calculated | required using the computing equation shown in Formula 1.

  Further, the rate of change (%) of the coupling coefficient K is based on the case where the secondary coil L2 is positioned in FIG. 3A, and the coupling coefficient Ks at each position of the secondary coil L2 is defined as the coupling coefficient Km. And Then, the change rate (%) of the coupling coefficient K at each position with respect to the position shown in FIG.

As shown in FIG. 3A, the secondary side magnetic core 21 faces the left side and center primary side magnetic core 11. At this time, the left end of the secondary magnetic core 21 is the same as the left end of the left primary magnetic core 11 and the right end of the secondary magnetic core 21 is the same as the right end of the central primary magnetic core 11. I'm doing it. At this time, from Table 1, the coupling coefficient K is 0.196.

FIG. 3B shows a state in which the secondary side magnetic core 21 is arranged at a position shifted 10 mm to the right from the position shown in FIG.
At this time, from Table 1, the coupling coefficient K is 0.185. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 5.6%.

FIG. 3C shows a state in which the secondary side magnetic core 21 is arranged at a position shifted 20 mm to the right from the position shown in FIG.
At this time, the coupling coefficient K is 0.169 from Table 1. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 13.8%.

FIG. 3D shows a state in which the secondary side magnetic core 21 is arranged at a position shifted by 30 mm to the right from the position shown in FIG.
At this time, from Table 1, the coupling coefficient K is 0.16. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 18.4%.

FIG. 3 (e) shows a state in which the secondary side magnetic core 21 is arranged at a position shifted by 40 mm to the right from the position shown in FIG. 3 (a).
At this time, from Table 1, the coupling coefficient K is 0.157. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 19.9%.

FIG. 3 (f) shows a state in which the secondary side magnetic core 21 is arranged at a position shifted 50 mm to the right from the position shown in FIG. 3 (a).
At this time, from Table 1, the coupling coefficient K is 0.157. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 19.9%.

FIG. 3G shows a state in which the secondary magnetic core 21 is arranged at a position shifted 60 mm to the right from the position shown in FIG.
At this time, from Table 1, the coupling coefficient K is 0.16. The change rate (%) with respect to the coupling coefficient K in FIG. 3A is 18.4%.

FIG. 3 (h) shows a state in which the secondary side magnetic core 21 is disposed at a position displaced by 70 mm to the right from the position shown in FIG. 3 (a).
At this time, the coupling coefficient K is 0.174 from Table 1. And the rate of change (%) with respect to the coupling coefficient K in FIG. 3A is 11.2%.

FIG. 3 (i) shows a state in which the secondary side magnetic core 21 is arranged at a position shifted 80 mm to the right from the position shown in FIG. 3 (a).
At this time, from Table 1, the coupling coefficient K is 0.187. The rate of change (%) with respect to the coupling coefficient K in FIG. 3A is 4.6%.

  FIG. 3J shows a state in which the secondary magnetic core 21 is disposed at a position shifted 90 mm to the right from the position shown in FIG. That is, the left end of the secondary side magnetic core 21 coincides with the left end of the central primary side magnetic core 11 and the right end of the secondary side magnetic core 21 coincides with the right end of the right side primary magnetic core 11. .

At this time, from Table 1, the coupling coefficient K is 0.196. The rate of change (%) with respect to the coupling coefficient K in FIG. 3A is 0.0%.
From the above, the coupling coefficient K between the secondary coil L2 and the opposing primary coil L1 at that time is 0.15 regardless of the position of the secondary magnetic core 21, that is, the sliding door 1. That's it.

  Therefore, no matter what position the sliding door 1 is, the secondary coil L2 wound around the secondary-side magnetic core 21 is an alternating power generated by each primary coil L1 by the oscillation drive of the high-frequency inverter 15 of the power feeding device 10. Secondary power can be received by a magnetic field.

In addition, since the rate of change of the coupling coefficient K is less than 20% when moving to FIGS. 3A to 3J, fluctuations in the secondary power received by the secondary coil L2 can be suppressed to a small level.
As shown in FIG. 1, the sliding door 1 is formed with a storage space 1 a in which the electric device E can be installed. A total of two storage spaces 1a are provided at the top and bottom. In the storage space 1a, an electric device E such as a flat-screen TV and a fan is installed. As other electrical equipment E, various things, such as a digital photo frame, a lighting fixture provided with LED and organic EL, a portable terminal, are installed, for example.

The electrical equipment E installed in the storage space 1a is driven by the secondary power received by the secondary coil L2 of the power receiving device 20 from the power feeding device 10.
The electrical configuration of the power feeding device 10 and the power receiving device 20 configured as described above will be described.

(Power supply device 10)
As shown in FIG. 4, the power feeding device 10 includes a high-frequency inverter 15 provided for each primary coil L1. Each high frequency inverter 15 converts electric power from the commercial power source G into a high frequency current, and supplies the high frequency current to the primary coil L1.

  FIG. 5 shows an electric circuit of the high-frequency inverter 15. The high-frequency inverter 15 is an inverter that rectifies the commercial power source G by the full-wave rectifier circuit 16 and excites the rectified DC voltage Vd through the primary coil L1 using the rectified DC voltage Vd as a drive source. The high-frequency inverter 15 of this embodiment is a self-excited single-voltage resonant inverter.

  The high frequency inverter 15 has a primary side smoothing capacitor Cs1 connected between the plus terminal P1 and the minus terminal P2 of the full wave rectifier circuit 16 and smoothes the DC voltage Vd from the full wave rectifier circuit 16. The high-frequency inverter 15 has a series circuit in which a first resistor R1 and a first charge / discharge capacitor C1 are connected in series, and the series circuit is connected in parallel to the primary-side smoothing capacitor Cs1.

  Therefore, when the DC voltage Vd from the full-wave rectifier circuit 16 is input, the DC voltage Vd is smoothed by the primary side smoothing capacitor Cs1. The smoothed DC voltage Vd is charged to the first charge / discharge capacitor C1 via the first resistor R1.

  The high-frequency inverter 15 has a primary side resonance capacitor Cr1 connected in parallel with the primary coil L1. The primary side resonance capacitor Cr1 forms an LC resonance circuit with the primary coil L1.

  The plus terminal side of the parallel circuit of the primary coil L1 and the primary side resonance capacitor Cr1 is connected to the plus terminal P1 of the full-wave rectifier circuit 16. Further, on the negative terminal side of the parallel circuit of the primary coil L1 and the primary side resonance capacitor Cr1, a parallel circuit in which a diode D1 and a second resistor R2 are connected in parallel is connected in series.

  The diode D1 has an anode terminal connected to the primary coil L1, and a cathode terminal connected to the drain terminal of an N-channel MOS transistor (referred to as a MOS transistor) Q1.

  In the MOS transistor Q1, a diode D2 is connected between the source and the drain, and the source terminal thereof is connected to the negative terminal P2 of the full-wave rectifier circuit 16 through the third resistor R3. A series circuit in which a feedback coil Lx and a fourth resistor R4 are connected in series is connected between the gate terminal of the MOS transistor Q1 and a connection point between the first resistor R1 and the first charge / discharge capacitor C1. ing. The feedback coil Lx is a coil that forms a resonant transformer with the primary coil L1.

  Therefore, when the charging voltage of the first charging / discharging capacitor C1 is boosted to the turn-on threshold voltage of the MOS transistor Q1, the MOS transistor Q1 is turned on. Further, when a positive electromotive force is induced on the fourth resistor R4 side of the feedback coil Lx, the MOS transistor Q1 is turned on. The primary coil L1 is energized when the MOS transistor Q1 is turned on.

  The gate terminal of the MOS transistor Q1 is connected to the negative terminal P2 of the full-wave rectifier circuit 16 via the bipolar transistor Q2. More specifically, the bipolar transistor Q2 has its collector terminal connected to the gate terminal of the MOS transistor Q1 and its emitter terminal connected to the negative terminal P2 of the full-wave rectifier circuit 16.

  The base terminal of the bipolar transistor Q2 is connected to the connection point between the source terminal of the MOS transistor Q1 and the third resistor R3 via the fifth resistor R5. Further, the base terminal of the bipolar transistor Q2 is connected to the negative terminal P2 of the full-wave rectifier circuit 16 through the second charge / discharge capacitor C2.

  Accordingly, when the MOS transistor Q1 is turned on, the primary coil L1 is energized, and the charging voltage of the second charge / discharge capacitor C2 is boosted to the turn-on threshold voltage of the bipolar transistor Q2, the bipolar transistor Q2 is turned on. Based on the turning on of the bipolar transistor Q2, the gate-source voltage of the MOS transistor Q1 falls below the turn-on threshold voltage, and the MOS transistor Q1 is turned off.

Here, the operation of the high-frequency inverter 15 will be described.
When the DC voltage Vd is output from the full-wave rectifier circuit 16, the DC voltage Vd is smoothed by the primary side smoothing capacitor Cs1 and charged to the first charging / discharging capacitor C1, and the primary coils L1 and 1 It is applied to a resonance circuit composed of a secondary resonance capacitor Cr1.

  The charging voltage of the first charging / discharging capacitor C1 is applied to the gate terminal of the MOS transistor Q1 through the feedback coil Lx and the fourth resistor R4. When the charging voltage of the first charging / discharging capacitor C1 reaches the threshold voltage of the MOS transistor Q1, the MOS transistor Q1 is turned on. When the MOS transistor Q1 is turned on, a current flows through the primary coil L1.

  Accordingly, a current flows through the third resistor R3, the second charge / discharge capacitor C2 is charged, and the base voltage of the bipolar transistor Q2 increases. When the charging voltage of the second charge / discharge capacitor C2 rises and the bipolar transistor Q2 is turned on, the MOS transistor Q1 is turned off.

  When the MOS transistor Q1 is turned off, the excitation energy of the primary coil L1 starts to move to the primary-side resonance capacitor Cr1, resonance (oscillation) starts, and a resonance voltage is generated in the resonance circuit. That is, the excitation energy of the primary coil L1 moves to the primary side resonance capacitor Cr1, and as it moves, the voltage at the connection point N between the primary coil L1 and the diode D1 increases in a sine wave form. The voltage at the connection point N becomes maximum when the excitation energy from the primary coil L1 to the primary side resonance capacitor Cr1 is completed.

  When the voltage fluctuation of the voltage at the connection point N occurs, the primary coil L1 is excited in the reverse direction, and a reverse electromotive force is induced in the feedback coil Lx. As a result, a reverse voltage is applied from the feedback coil Lx, and the gate voltage of the MOS transistor Q1 falls in a sine wave shape. When the transfer of the excitation energy from the primary coil L1 to the primary side resonance capacitor Cr1 is completed, the moved energy starts to return from the primary side resonance capacitor Cr1 to the primary coil L1, and as it returns, the connection point N The voltage drops in a sine wave.

  When the voltage fluctuation of the voltage at the connection point N occurs, the primary coil L1 is excited positively and a positive electromotive force is induced in the feedback coil Lx. As a result, a positive voltage from the feedback coil Lx is applied, and the gate voltage of the MOS transistor Q1 rises in a sine wave shape. When the gate voltage of the MOS transistor Q1 reaches the turn-on threshold, the MOS transistor Q1 is turned on. When the MOS transistor Q1 is turned on, a drain current flows, the second charge / discharge capacitor C2 is charged, and the base voltage of the bipolar transistor Q2 increases.

  Eventually, when the base voltage of the bipolar transistor Q2 reaches its turn-on threshold, the bipolar transistor Q2 is turned on and the MOS transistor Q1 is turned off. When the MOS transistor Q1 is turned off, the excitation energy of the primary coil L1 starts to move again to the primary side resonance capacitor Cr1, and the primary coil L1 is reversely excited to induce a reverse electromotive force in the feedback coil Lx. Is done.

As a result, a reverse voltage is applied from the feedback coil Lx, and the base voltage of the MOS transistor Q1 falls in a sine wave shape.
Also, the discharge of the second charge / discharge capacitor C2 starts when the MOS transistor Q1 is turned off. Then, the bipolar transistor Q2 is turned off.

  Subsequently, when the movement of the excitation energy of the primary coil L1 from the primary coil L1 to the primary side resonance capacitor Cr1 is completed, the moved energy returns from the primary side resonance capacitor Cr1 to the primary coil L1. start. As it returns, the voltage at the connection point N falls in a sine wave shape, the primary coil L1 is excited positively, and a positive electromotive force is induced in the feedback coil Lx.

  As a result, a positive voltage is applied from the feedback coil Lx, and the gate voltage of the MOS transistor Q1 rises in a sine wave shape. When the gate voltage reaches the turn-on threshold, the MOS transistor Q1 is turned on.

  Thereafter, the inverter operation is repeated with the same operation. Thus, by repeating the inverter operation, the primary coil L1 is excited and the alternating magnetic field is coupled to the secondary coil L2 of the power receiving device 20 that is coupled to the primary coil L1 in the state of the coupling coefficient K described above. Radiates towards.

(Power receiving device)
In the power receiving device 20 provided in the sliding door 1, a secondary side resonance capacitor Cr2 for resonance is connected in parallel to the secondary coil L2 wound around the secondary side magnetic core 21. The secondary coil L2 generates secondary power in an alternating magnetic field radiated from each primary coil L1 of the power feeding apparatus 10 coupled in the state of the coupling coefficient K described above. The secondary coil L <b> 2 is connected to the full wave rectifier circuit 25.

  The full-wave rectifier circuit 25 rectifies the secondary power received by the secondary coil L <b> 2 and outputs the rectified DC voltage to the voltage stabilization circuit 26. The voltage stabilizing circuit 26 converts the voltage from the full-wave rectifier circuit 25 into the same voltage as the commercial voltage of the commercial power supply frequency, and supplies the converted voltage to the electric equipment E installed in the storage space 1a of the sliding door 1. . The electric device E is driven based on the converted voltage from the voltage stabilizing circuit 26.

Next, the operation of the non-contact power feeding system configured as described above will be described.
Now, each primary coil L1 provided in the Kamoi 2 is supplied with a high-frequency current by a respective high-frequency inverter 15 to generate an alternating magnetic field.

  In this state, the sliding door 1 is moved in one direction along the duck 2 and the sill 3, and the coupling coefficient K between the secondary coil L2 and the primary coil L1 facing each other at that time is 0 regardless of the position. .15 or more. And the secondary coil L2 wound by the secondary side magnetic body core 21 provided in the sliding door 1 generate | occur | produces secondary electric power with the alternating magnetic field radiated | emitted from each primary coil L1.

  The secondary power generated by the secondary coil L2 is rectified by the full-wave rectifier circuit 25 of the power receiving device 20, and is output to the voltage stabilization circuit 26, and then output to the electric device E to drive the electric device E. To do.

Next, effects of the embodiment configured as described above will be described below.
(1) According to the above embodiment, the length in the moving direction of each primary magnetic core 11 is the length X1, and the distance between the primary magnetic core 11 and the primary magnetic core 11 is long. In addition to D, the length in the moving direction of the secondary-side magnetic core 21 is defined as length X2. And each primary side magnetic body core 11 and the secondary side magnetic body core 21 were arrange | positioned so that it might be set to D> = 2X1 and it was X2> = 2X1 + D.

Thus, the power receiving device 20 can sufficiently obtain the secondary power regardless of the position of the sliding door 1 within a range that satisfies this condition.
At this time, since the primary coils L1 are arranged with a certain length D open, the number of primary coils L1 can be reduced. Moreover, as the number of primary coils L1 decreases, the number of high-frequency inverters 15 also decreases.

As a result, it is possible to realize downsizing, saving work, and low cost as compared with the conventional configuration in which the primary coil L1 is spread in the moving direction of the sliding door 1.
Further, since the primary coils L1 are arranged with a certain length D from each other, the primary coil L1 adjacent to the primary coil L1 and the wire wound around the primary magnetic core 11 do not hit each other. It is not necessary to make the wire of the coil L1 thinner, and there is no need to consider the heat generated by the wire.

  (2) According to the above embodiment, the resonance capacitors Cr1 and Cr2 are provided in parallel with the primary coil L1 and the secondary coil L2, respectively. For this reason, the high-frequency voltage on the primary coil L1 side can be boosted, and similarly, the output voltage on the secondary coil L2 side can be boosted or made constant. Further, even if the coupling coefficient K between the primary coil L1 and the secondary coil L2 is small, power can be transmitted with high efficiency.

(3) According to the above embodiment, the high frequency inverter 15 is constituted by a voltage resonance type inverter. Therefore, the voltage between the terminals of the primary coil L1 can be increased.
In addition, since the high-frequency inverter 15 is configured as a self-excited, single-voltage (MOS transistor Q1) voltage resonance type, it can oscillate with a small number of components, and a small and low-cost non-contact power supply system can be realized.

  (4) According to the above-described embodiment, the storage device 1 is provided with the storage space 1a, and the electrical device E can be driven in a state where the preferred electrical device E such as a flat-screen TV or a fan is installed in the storage space 1a. It becomes possible. Therefore, the freedom degree of arrangement | positioning of the electric equipment E can be improved by moving the sliding door 1 suitably.

The above embodiment may be modified as follows.
In the above embodiment, the primary coil L1 is wound around the intermediate portion 11b of the primary side magnetic core 11, but may be wound around both side portions 11a. Of course, instead of the intermediate portion 11b, it may be wound around both side portions 11a.

  Similarly, although the secondary coil L2 is wound around the intermediate part 21b of the secondary side magnetic core 21, it may be wound around both side parts 21a. Of course, instead of the intermediate portion 21b, it may be wound around both side portions 21a.

  In the above embodiment, the secondary magnetic core 21 is a C-type core. This may be performed with an I-type secondary magnetic core 31 as shown in FIG. However, the secondary coil L2 is wound around the intermediate part of the secondary side magnetic core 31, as shown in FIG.

  In the above embodiment, the primary side resonance capacitor Cr1 is connected in parallel to the primary coil L1. This may be performed by connecting a resonance capacitor in series with the primary coil L1.

Similarly, a secondary side resonance capacitor Cr2 was connected in parallel to the secondary coil L2. This may be performed by connecting a resonance capacitor in series to the secondary coil L2.
In the above embodiment, the high-frequency inverter 15 is a one-stone voltage resonance type inverter. This may be performed by a half-bridge type high-frequency inverter or a full-bridge type high-frequency inverter.

  ○ In the above embodiment, the metal foreign object detection function, authentication function, magnetic field and electric field shield, heat dissipation mechanism for heat dissipation of circuits, etc., noise countermeasure circuit, energy saving standby by intermittent coil excitation, etc. are omitted. However, these functions may be incorporated.

  In the above embodiment, the moving body is the sliding door 1 provided in the room. However, as long as the moving body reciprocates similarly to the sliding door 1, the moving body is not limited to the sliding door 1, but a window glass, a shoji screen, a bran, a partition wall, a fixture. It may be a sliding door.

  Moreover, in the said embodiment, although the single secondary coil L2 was provided in the sliding door 1, it is not limited to this, If the range which satisfy | fills the said conditions, multiple secondary coils L2 are provided. Of course, it may be.

  In the above embodiment, the moving body is embodied as the sliding door 1 provided in the room. However, the present invention is not limited to this, and may be outdoors. In short, any moving body that moves in one direction may be used. Good.

  DESCRIPTION OF SYMBOLS 1 ... Sliding door (moving body), 1a ... Storage space, 2 ... Kamoi, 3 ... Sill, 10 ... Feeding device, 11 ... Primary side magnetic body core, 11a ... Side part, 11b ... Middle part, 15 ... High frequency inverter, DESCRIPTION OF SYMBOLS 16 ... Full wave rectifier circuit, 20 ... Power receiving apparatus, 21, 31 ... Secondary side magnetic core, 21a ... Side part, 21b ... Intermediate part, 25 ... Full wave rectifier circuit, 26 ... Voltage stabilization circuit, E ... Electricity Equipment, L1 ... Primary coil, L2 ... Secondary coil, G ... Commercial power supply, R1-R5 ... First to fifth resistors, Cs1 ... Primary side smoothing capacitor, C1, C2 ... First and second charge / discharge capacitors , Cr1, Cr2 ... primary and secondary resonance capacitors, D1, D2 ... diodes, N ... connection point, P1 ... plus terminal, P2 ... minus terminal, Q1 ... N channel MOS transistor, Q2 ... bipolar transistor, Lx ... Feedback coil, Vd DC voltage, X1, X2, D ... length, K ... coupling coefficient.

Claims (6)

A power feeding device in which a plurality of primary coils wound around a primary magnetic core are arranged in parallel at intervals in one direction;
A power receiving device having a secondary coil wound around a secondary magnetic core that is long in the one direction is moved in the one direction, and the secondary magnetic cores are arranged in parallel in the one direction. A moving body that moves along the next coil,
A high frequency current is supplied to the primary coil, a secondary power is generated in the secondary coil by an alternating magnetic field generated by the primary coil, and the secondary power is supplied to an electric device provided in the moving body. A non-contact power supply system,
The length in the one direction of the primary magnetic core is X1, the length in the one direction of the secondary magnetic core is X2, and the primary magnetic core and the primary magnetic core When the interval of D is D
D ≧ 2X1
Because
X2 ≧ 2X1 + D
The non-contact power feeding system, wherein the primary magnetic core and the secondary magnetic core are arranged so as to satisfy the above. In the non-contact electric power feeding system of Claim 1,
The non-contact power feeding system, wherein the secondary magnetic core is a C-type or I-type core. In the non-contact electric power feeding system according to claim 1 or 2,
The non-contact power feeding system, wherein each of the plurality of primary coils includes a high-frequency inverter that supplies a high-frequency current to the primary coil. In the non-contact electric power feeding system as described in any one of Claims 1-3,
The primary coil and the secondary coil are respectively connected to a resonance capacitor in series or in parallel. In the non-contact electric power feeding system as described in any one of Claims 1-4,
A storage space for storing the electrical device is formed in the moving body. In the non-contact electric power feeding system as described in any one of Claims 1-5,
The power feeding device is provided in a duck in a room, and a plurality of primary side magnetic cores wound with the primary coil are arranged in parallel along the duck.
The moving body is a sliding door provided between the duck and a sill door, and the secondary magnetic core around which the secondary coil of the power feeding device is wound moves the sliding door along the duck. The non-contact power feeding system is provided on the upper side of the sliding door so as to face each primary side magnetic core arranged side by side in the Kamoi.