JP2012016106A - Alignment system of noncontact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To present an alignment system of a noncontact power supply device being capable of providing positional-displacement information such as positional-displacement information in the horizontal direction first and being simply and easily actualized second.SOLUTION: In the alignment system, magnets 15 are arranged to one of a vehicle B or the like and the ground A side and a pair of reed switches 16 to the another. Both reed switches 16 are distributed and arranged on both sides of a center line D of both mutual reed switches 16, and can detect the magnetic fields of the magnets 15 while interposing an air gap when performing an alignment before power supply. The magnets 15 are set in a relationship where a secondary-side coil 5 is positioned corresponding to the primary-side coil 3 of the noncontact power supply device 1 when the magnets 15 are made positioned corresponding to the center line D. Consequently, the positional-displacement information on whether or not the secondary-side coil 5 is positioned corresponding to the primary-side coil 3 can be provided on the basis of the detecting signals of both reed switches 16.

Description

  The present invention relates to an alignment system for a non-contact power feeding apparatus. That is, the present invention relates to a positioning system for a non-contact power feeding device that supplies power from the ground side to a moving body such as a vehicle in a non-contact manner.

《Technical background》
A non-contact power supply device that supplies electric power from the outside to a vehicle such as an electric vehicle without mechanical contact such as a cable has been developed and put into practical use based on demand.
In this non-contact power feeding device, based on the mutual induction action of electromagnetic induction, from the primary side coil placed on the ground side to the secondary side coil mounted on the vehicle or other moving body side, about several tens mm to several hundreds mm Electric power is supplied while the air gap is present and the corresponding position is present (see also FIG. 6 described later).

<Conventional technology>
When power is supplied by such a non-contact power supply device, it is necessary that the secondary coil mounted on the moving body such as a vehicle is positioned corresponding to the primary coil fixed on the ground side. . One of the important points in power supply efficiency is that the corresponding position is not displaced.
For example, in a typical example in which power is supplied with a primary coil on the ground side and a secondary coil on the vehicle side corresponding to each other in the vertical direction, the secondary coil is in the front-rear direction or It is necessary that they are aligned in the left-right direction without being displaced and are in corresponding positions.
On the other hand, in this type of conventional example, such positioning is performed by a driver of a vehicle or the like by performing a steering operation while traveling at a low speed, relying on a mark provided on the ground side of a road or the like. It was.

Examples of the non-contact power feeding device described above include those disclosed in the following Patent Document 1 and Patent Document 2.
JP 2008-087733 A JP 2010-035300 A

"problem"
By the way, the following subject was pointed out about such a prior art example. That is, when the secondary coil on the vehicle side or the like is positioned corresponding to the primary coil on the ground side, it is easy to align both in the front-rear direction, but not in the left-right direction. Was pointed out.
The front-rear direction (running direction) of a vehicle, etc. is relatively easy to align, and even if the front-rear position does not match, it can be easily and quickly fine-tuned and corrected by a forward-backward movement operation (front-rear stop position of a vehicle, etc.) Problem).
On the other hand, in the left-right direction orthogonal to the front-rear direction, it is difficult to align the position by steering operation due to the difficulty in understanding the positional deviation. Therefore, the construction of a system that provides right and left positional deviation information to the driver has been desired.
Note that such a problem is not limited to the example in which the primary side coil and the secondary side coil are fed at the corresponding positions in the upper and lower directions as described above, and the feeding is performed at the corresponding positions in other positional relationships. The case where it is done is also proposed.

<< About the present invention >>
In view of such a situation, the non-contact power feeding apparatus alignment system of the present invention has been made to solve the above-described problems of the prior art.
The present invention firstly proposes an alignment system for a non-contact power feeding device that can provide positional deviation information in the left-right direction and the like, and secondly, this can be realized easily and easily. And aim.

<About each claim>
The technical means of the present invention for solving such a problem is as follows, as described in the claims.
About Claim 1, it is as follows. The alignment system according to claim 1 has an air gap from a primary coil placed on the ground side to a secondary coil mounted on a vehicle or other moving body based on the mutual induction action of electromagnetic induction. It is used in a non-contact power feeding device that supplies power while correspondingly positioned.
A magnet is disposed on one of the movable body side and the ground side, and a pair of reed switches is disposed on the other side. The mobile body travels with the aim of positioning the secondary side coil relative to the primary side coil at the time of alignment before feeding.
Both the reed switches are arranged on both sides of the center line between them, and both can detect the magnetic field of the magnet with an air gap at the time of alignment before power feeding.
When the magnet is positioned corresponding to the center line, the secondary coil is set to have a relationship corresponding to the primary coil. Therefore, based on the detection signals of both the reed switches, it is possible to provide positional deviation information as to whether or not the secondary side coil is in a corresponding position with respect to the primary side coil. .

About Claim 2, it is as follows. In the positioning system for a non-contact power feeding device according to claim 2, power feeding is performed with the secondary coil corresponding to the upper and lower positions relative to the primary coil, and the center line is It is set along the front-rear direction, which is the traveling direction.
Therefore, based on the detection signals of both the reed switches, it is possible to provide left-right positional deviation information as to whether or not the secondary side coil corresponds to the primary side coil in the left-right direction. It is characterized by.
About Claim 3, it is as follows. According to a third aspect of the present invention, there is provided a contactless power supply alignment system according to the first aspect, wherein a plurality of the magnets are arranged in series.
About Claim 4, it is as follows. According to a fourth aspect of the present invention, there is provided the positioning system for the non-contact power feeding device according to the first aspect, wherein the positional deviation information can be provided based on a state of a pulse generated as a detection signal of both the reed switches. .

About Claim 5, it is as follows. According to a positioning system for a non-contact power feeding device according to a fifth aspect of the present invention, in the first aspect, either the magnet or the reed switch is rotated at the time of positioning before power feeding.
When the reed switch is rotated, power is supplied to the reed switch of the power receiving circuit in a non-contact manner for detection based on the mutual induction action of electromagnetic induction between corresponding coils. The detection signal is detected in a non-contact manner using a voltage change of the primary circuit on the power feeding side.
About Claim 6, it is as follows. According to a positioning system for a non-contact power feeding device according to a sixth aspect, in the first aspect, an AC-driven electromagnet is used as the magnet, and a semiconductor sensor having a semiconductor magnetoresistive element instead of the reed switch is used. used. Thus, the semiconductor sensor can detect the magnetic field of the electromagnet.

<About the action>
Since the present invention comprises such means, the following is achieved.
(1) This alignment system includes a magnet and a pair of reed switches on the ground side and a moving body side such as a vehicle.
(2) When the magnet is positioned corresponding to the center line between the two reed switches, the secondary coil on the vehicle side of the non-contact power feeding device is positioned corresponding to the primary coil on the ground side. (3) Based on such a relationship, it is possible to provide misalignment information indicating whether the secondary coil is in a corresponding position with respect to the primary coil, for example, whether it is misaligned in the left-right direction. is there.
(4) That is, positional deviation information is provided based on the detection signals of both reed switches.
(5) Specifically, the positional relationship of the secondary coil with respect to the primary coil is determined from the state of pulses detected and generated from both reed switches.
(6) Based on this positional deviation information, a driver of a vehicle or the like performs a steering operation or the like so as to position the secondary side coil corresponding to the primary side coil.
(7) Then, power is supplied from the primary side coil to the secondary side coil by the non-contact power supply device while being excellent in power supply efficiency.
(8) This positioning system has a simple configuration with a magnet, a reed switch, an incidental member and the like added thereto.
(9) The non-contact power feeding device alignment system of the present invention exhibits the following effects.

<< First effect >>
First, it is possible to provide positional deviation information in the left-right direction and the like. That is, in the positioning system for a non-contact power feeding device according to the present invention, both the reed switches arranged to distribute the magnetic field of the magnet can detect the positioning before feeding.
Then, based on the state of the detection signal generated as a pulse, it is possible to provide misalignment information as to whether or not the secondary side coil corresponds to the primary side coil. When the primary side coil and the secondary side coil are positioned corresponding to each other in the vertical direction and power feeding is performed, positional deviation information in the left-right direction can be provided.
Accordingly, a driver of a moving body such as a vehicle can easily detect and recognize a positional deviation in the left-right direction based on such positional deviation information. Based on this, the position deviation can be finely adjusted and corrected easily and easily by a steering operation or the like, and the secondary coil on the moving body side can be made to correspond to the primary coil on the ground side.
Particularly in snowy areas, it is difficult to align the position with reference to a line mark drawn on the road surface, and the present invention is extremely effective.

<< Second effect >>
Secondly, this is easily and easily realized. In the non-contact power feeding apparatus alignment system of the present invention, the first point described above can be easily realized with a simple configuration.
In other words, this alignment system has a simple configuration in which a magnet, a reed switch, and their associated members are added later to a conventional non-contact power supply device, and the cost burden is small.
As described above, the effects exerted by the present invention are remarkably large, such as all the problems existing in this type of conventional example are solved.

About the positioning system of the non-contact electric power feeder which concerns on this invention, it uses for description of the form for implementing invention, It is explanatory drawing of a bottom face or a plane, (1) The figure shows before positioning, (2) The figure shows after alignment. For explanation of the mode for carrying out the present invention, the positional relationship between the magnet and the two reed switches and the corresponding pulse waveform are shown. (1) FIG. 3 shows no misalignment, (2) FIG. FIGS. 4A and 4B show a state in which the positional deviation gradually increases. For explanation of the mode for carrying out the invention, (1) is a front view of a magnet and a reed switch, and (2) is a block diagram of the configuration of a control unit and the like. It is used for description of the form for implementing this invention, and is a schematic front view of the example using an electromagnet and a semiconductor sensor, (1) A figure shows the whole and (2) A figure shows an electromagnet. It is a circuit diagram for description of the non-contact power feeding device. For the description of the non-contact power feeding device, (1) is an overall explanatory diagram, and (2) is a block diagram of the configuration.

Hereinafter, embodiments for carrying out the present invention will be described in detail.
<< About the non-contact electric power feeder 1 >>
First, the non-contact power feeding device 1 which is a premise of the present invention will be generally described with reference to FIG. 5 and FIG.
The non-contact power feeding device 1 is based on the mutual induction action of electromagnetic induction, and the air gap G exists between the primary side coil 3 of the primary side circuit 2 and the secondary side coil 5 of the secondary side circuit 4. Electric power is supplied while being in a corresponding position by contact. The primary side circuit 2 is fixedly arranged on the ground A side, and the secondary side circuit 4 is mounted on a moving body such as the vehicle B side.

Such a non-contact power feeding device 1 will be described in further detail. First, the primary side circuits 2 on the power supply side, the track side, and the primary side are stationaryly arranged on the ground, road surface, floor surface, and other ground A side in the power supply stand C and other power supply areas.
On the other hand, the secondary circuit 4 on the power receiving side, the pickup side, and the secondary side is mounted on an electric vehicle (EV car), a vehicle B such as a train, and other moving bodies. The secondary side circuit 4 can be used not only for driving but also for non-driving, and is typically connected to the in-vehicle battery 6 as shown in FIG. 6, but in FIG. As shown, it may be directly connected to various loads L.
The primary side coil 3 of the primary side circuit 2 and the secondary side coil 5 of the secondary side circuit 4 are air that is a slight gap space of about several tens mm to several hundreds mm, for example, about 50 mm to 150 mm, during power feeding. While the gap G exists, the corresponding positions are close to each other without contact. In the illustrated example, the corresponding positions are vertically located.
Further, a stop power feeding method in which the secondary coil 5 is stopped on the primary coil 3 or the like is typical for power feeding. In the case of the stop power feeding method, the primary coil 3 and the secondary coil are representative. 5 is a symmetrical structure that can be paired vertically or the like. On the other hand, a mobile power feeding method is also possible in which the secondary coil 5 feeds power while traveling on the primary coil 3 at a low speed.

The primary coil 3 of the primary circuit 2 is connected to a power source 7 in which a high frequency inverter is used. In FIG. 5, 8 is a choke coil, 9 is a capacitor for series resonance, and 10 is a capacitor for parallel resonance.
The secondary side coil 5 of the secondary side circuit 4 can be connected to the battery 6 in the example of FIG. 6, and the traveling motor 11 is driven by the battery 6 charged by power feeding. In FIG. 6, 12 is a converter that converts alternating current into direct current, 13 is an inverter that converts direct current into alternating current, and 14 in FIG. 5 is a capacitor for parallel resonance.
The primary side coil 3 and the secondary side coil 5 have a flat flat structure of a plurality of turns.

The mutual induction effect of electromagnetic induction is as follows. During power feeding, an induced electromotive force is generated in the secondary side coil 5 by forming a magnetic flux in the primary side coil 3 between the primary side coil 3 and the secondary side coil 5 located at the corresponding positions. It is publicly known to supply power to the secondary side coil 5 from the second side.
That is, when a high-frequency alternating current of about 10 kHz to 100 kHz, for example, is applied to the primary side coil 3 of the primary side circuit 2 as an excitation current, a magnetic field is generated around the primary side coil 3 and the magnetic flux is It is formed in a direction perpendicular to the surface. Then, the magnetic flux thus formed penetrates the secondary side coil 5 of the secondary side circuit 4 and is linked, thereby generating an induced electromotive force, thereby forming a magnetic field, and using the magnetic field, electric power is generated. Sent and received. It is also possible to supply power of several kW or more, for example, about several tens kW to several hundred kW.
The non-contact power feeding device 1 is generally configured as described above.

<< Outline of the Invention >>
The present invention will be described below with reference to FIGS. First, the outline of the present invention is as follows.
In the alignment system for the non-contact power feeding device 1 of the present invention, the magnet 15 is disposed on one of the moving body side such as the vehicle B and the ground A side, and the pair of reed switches 16 is disposed on the other side. It is installed. A moving body such as the vehicle B enters the vehicle with the goal that the secondary coil 5 is in a corresponding position with respect to the primary coil 3 at the time of alignment before power feeding.
Both the reed switches 16 are arranged on both sides of the center line D between them, and both can detect the magnetic field of the magnet 15 with the air gap G in alignment before power feeding. When the magnet 15 is positioned corresponding to the center line D, the secondary coil 5 is set so as to be positioned corresponding to the primary coil 3.
Therefore, based on the detection signals of both the reed switches 16, it is possible to provide positional deviation information as to whether or not the secondary coil 5 is in a corresponding position with respect to the primary coil 3.
The outline of the present invention is as described above.

<Regarding the reed switch 16 and the magnet 15>
Such an alignment system for the non-contact power feeding device 1 of the present invention will be described in more detail with reference to FIGS. First, the reed switch 16 and the magnet 15 will be described.
The vehicle B in the illustrated example is made up of a bus, for example, and the secondary coil 5 is positioned corresponding to the primary coil 3 in the vertical direction so that power is supplied.
A secondary coil 5 is mounted below the floor of the vehicle B on the power receiving side, the pickup side, and the secondary side, and a pair of reed switches 16 are arranged adjacent to the secondary coil 5. It is installed.
In the example of FIG. 1, the secondary coil 5 and the reed switch 16 are disposed adjacent to the front-rear direction (traveling direction) E of the vehicle B, and are disposed adjacent to the left-right direction F in the example of FIG. . Of course, it is not indispensable that the two are disposed adjacent to each other, and they may be mounted and disposed at an appropriate site such as the vehicle B.
The two reed switches 16 are arranged on both the left and right sides of a center line D (virtual line) set along the front-rear direction E in the illustrated example.
The reed switch 16 is switched on and off according to the presence / absence of excitation by the magnetic field of the magnet 15, thereby detecting the magnetic field change as a voltage change. That is, the reed switch 16 is switched on when the magnet 15 approaches, and is switched off when the magnet 15 leaves.

On the other hand, on the ground A side of the power supply side, the track side, and the primary side, the primary side coil 3 is disposed on the ground surface, the road surface, and the floor surface in the illustrated example. A magnet 15 is disposed adjacent to the magnet 15.
In the example of FIG. 1, the primary coil 3 and the magnet 15 are disposed adjacent to each other in the front-rear direction E, which is the traveling direction of the vehicle B, and are disposed adjacent to the left-right direction F in the example of FIG. 3. Of course, the two do not need to be arranged adjacent to each other, and can be arranged apart from each other.
A permanent magnet is used as the magnet 15. Although the number of magnets 15 can be one, in the example shown in the drawing, a plurality of magnets 15 are arranged in series along the front-rear direction E while aligning the N-pole and S-pole magnetic poles. For example, they are arranged in a straight line with an interval of about several tens of centimeters.
In the illustrated example, in view of the stop power feeding method, the vehicle B gradually decreases in speed, so that the interval is gradually narrowed in the forward and backward direction E. Regardless of this, they may be arranged at equal pitch intervals.
The reed switch 16 and the magnet 15 are as described above.

<About the control unit 17 etc.>
Next, the control unit 17 and the like will be described. As described above, both the reed switches 16 can detect the magnetic field of the magnet 15 through the air gap G at the time of alignment before power feeding. Then, the ON voltage is intermittently generated by the ON / OFF switching of the contacts when both the reed switches 16 pass the magnet 15, and the pulse generated and transmitted as a detection signal by repeating the ON / OFF switching is shown in (2) of FIG. As shown in the figure, the data is input to the control unit 17 disposed on the vehicle B side.
The control unit 17 can provide positional deviation information based on the detection signal of the reed switch 16, that is, the state of the pulse. In the illustrated example, it is possible to provide misalignment information regarding the left and right direction as to whether or not the secondary side coil 5 corresponds to the primary side coil 3 in the left and right direction F.
As the control unit 17, a signal processing means including a microcomputer loaded with a dedicated program and a comparator is used. When the magnet 15 is positioned corresponding to the center line D between the two reed switches 16, the secondary coil 5 is set to have a corresponding position in the left-right direction F with respect to the primary coil 3. As a premise, positional deviation information can be provided based on the state (pulse width) of the input pulse.

These will be further described in detail. First, as shown in (1) view of FIG. 2, when the magnet 15 is moved while a position corresponding to both the lead switch ₁₆ 1, 16 ₂ of the center line D, the pulse _P 1 as illustrated, P _Two waveforms are obtained and discriminated as follows.
That is, the on / off states of the pulses P ₁ and P ₂ of both the reed switches 16 ₁ and 16 _{2 on} both sides, that is, the widths of the pulse widths are common, and it is considered that the pulse level is acceptable. When the magnet 15 approaches the magnetic field, both of the reed switches 16 ₁ and 16 ₂ are simultaneously turned on, so that the pulse width appears only for the ON time.
Accordingly, it is determined that the secondary coil 5 is located corresponding to the primary coil 3 in the left-right direction F, and positional deviation information to that effect is provided.

In contrast, (2) view of FIG. 2, (3) figure as shown in (4) figure magnet 15 is not a position corresponding to both the lead switch ₁₆ 1, 16 ₂ of the center line D, whereas Are located on the reed switch side, the waveforms of the pulses P ₁ and P ₂ are as shown in the figure, and are determined as follows.
That starts quickly one lead switch 16 ₁ ON pulse P _1, while the on state (pulse width) is long, starts slow on the pulse P ₂ of the other reed switch 16 _2, the on-state ( (Pulse width) is gradually shortened and further becomes nothing, and it is considered that the pulse level is not possible.
Accordingly, it is determined that the secondary coil 5 is not in the corresponding position in the left-right direction F with respect to the primary coil 3, and positional deviation information to that effect is provided. (2) From the state of the figure, (3) The state of the figure, (3) From the state of the figure, (4) The state of FIG.
Along with such a control unit 17, a display unit 18 is disposed on the vehicle B side as shown in FIG.
Based on the output signal of the control unit 17, the display unit 18 can transmit the above-described various positional deviation information to the driver of the vehicle B by flashing a lamp indicator lamp or the like. For example, a multi-stage lamp display corresponding to each stage of FIG. 2 (1), (2), (3), and (4) is performed.
The control unit 17 and the like are as described above.

《Action etc.》
The alignment system of the non-contact power feeding device 1 of the present invention is configured as described above. Therefore, it becomes as follows.
(1) In this alignment system, a magnet 15 and a pair of reed switches 16 are arranged on a moving body such as the ground A side and the vehicle B side. In the illustrated example, a magnet 15 is disposed on the ground A side, and a reed switch 16 is disposed on the vehicle B side.
The reed switches 16 are arranged on both sides of the center line D so that the reed switches 16 can detect the magnetic field of the magnet 15 with the air gap G at the time of alignment before feeding. (See FIG. 1).
In the illustrated example, both reed switches 16 are arranged on both the left and right sides of the center line D along the front-rear direction E, and the magnetic field of the magnet 15 can be detected on each of the left and right sides.

(2) At the time of alignment before power feeding, the moving body such as the vehicle B has a secondary coil 5 on the moving body side such as the vehicle B with respect to the primary coil 3 on the ground A side of the non-contact power feeding device 1. However, with the goal of being in the corresponding position, the vehicle enters.
By the way, when the secondary coil 5 is positioned corresponding to the primary coil 3, the magnet 15 is positioned to correspond to the center line D between the reed switches 16 (see FIG. 1 (2), (See (1) in FIG. 2).

(3) Based on such a relationship, in this alignment system, it is possible to provide positional deviation information as to whether or not the secondary coil 5 is in a corresponding position with respect to the primary coil 3.
As shown in the example, when the primary side coil 3 and the secondary side coil 5 are fed at the corresponding positions in the vertical direction, the positional deviation information indicating whether or not the lateral direction F is displaced, It can be provided (see FIGS. 1 and 3 (1)).

  (4) That is, the state of the detection signal detected by both the reed switches 16, that is, the state of the pulse P generated and transmitted is discriminated by the control unit 17 (see FIG. 3 (2)). Based on this, positional deviation information between the primary side coil 3 and the secondary side coil 5 can be provided.

(5) More specifically, as shown in FIG. 2, the states of the pulses P ₁ and P ₂ detected by the reed switches 16 ₁ and 16 ₂ , that is, the widths of the pulse widths are compared and observed. Thus, it is determined whether or not the primary coil 3 and the secondary coil 5 are in corresponding positions.
The center line D between the reed switch ₁₆ 1, 16 _2, when the magnet 15 is moved while supporting position, both lead switches ₁₆ 1, 16 ₂ are both common pulse _P 1, _{P 2} is, as a detection signal (See FIG. 2 (1)). Accordingly, it is determined that the primary coil 3 and the secondary coil 5 are in corresponding positions.
On the other hand, when the magnet 15 does not correspond to the center line D between the reed switches 16 ₁ and 16 ₂ , for example, the pulse width of _one reed switch 161 becomes wide, whereas the other reed switch 16 _second pulse width is narrow, even a non-(see (2) figure 2, (3) figure (4) figure). Accordingly, it is determined that the primary side coil 3 and the secondary side coil 5 are not in the corresponding positions.

(6) The positional deviation information obtained by the control unit 17 in this way is displayed on the display unit 18 (see FIG. 3B).
Therefore, a driver of a moving body such as the vehicle B can detect and recognize the positional deviation in the left-right direction F based on such positional deviation information.
Based on this, the secondary coil 5 on the movable body side such as the vehicle B can be made to correspond to the primary coil 3 on the ground A side by steering operation of the vehicle B or the like that travels at a low speed. .
In the example of FIG. 2, the vehicle B or the like traveling at a low speed for alignment before power feeding (see FIG. 1 (1)) is changed from the large misalignment state of FIG. 2 (4) to (3) The state of misalignment shown in the figure and (2) the steering to the position misalignment state shown in the figure is performed, and finally, the state of (1) no misalignment shown in FIG. 1 is obtained (see FIG. 1 (2)).

(7) Now, with the positioning system in this manner, the secondary coil 5 is placed in a corresponding position with respect to the primary coil 3, and then power feeding by the non-contact power feeding device 1 is started.
That is, based on the mutual induction action of electromagnetic induction, power is supplied from the primary side coil 3 on the ground A side to the secondary side coil 5 on the mobile body side such as the vehicle B and the secondary side circuit 4. Is implemented. This power feeding is performed with excellent power feeding efficiency because the secondary coil 5 is positioned corresponding to the primary coil 3.

(8) The positioning system has a simple configuration in which the magnet 15, the reed switch 16, an incidental member, and related members are added to the non-contact power feeding device 1 later.
As for the action, it is as above.

<< Development of the present invention >>
Now, the positioning system of the non-contact power feeding device 1 according to the present invention further has the following first, second, third, fourth, fifth, sixth, seventh and eighth configurations. It is done.
First, consider the concept of corresponding positions. In this specification, “corresponding position” means that the center lines are aligned with each other in a substantially opposite manner, with a slight difference in dimension, in addition to the case where the center line is aligned, etc. Cases are also included.
That is, the term corresponding position is used in a broad sense. The configuration of whether or not the secondary coil 5 is positioned corresponding to the primary coil 3 and whether or not the magnet 15 is positioned corresponding to the center line D is interpreted in this way.

Second, the rotation of the reed switch 16 and the like will be examined. It is conceivable that either one of the magnet 15 and the reed switch 16 is rotated around the axis when positioning before feeding.
In the illustrated example of FIG. 3A, both the reed switches 16 on the vehicle B side rotate on a horizontal plane. In the figure, 19 is a motor such as a stepping motor for rotation driving or a DC motor, 20 is its driver, 21 is a pulley for power transmission, and 22 is a belt stretched between the pulleys 21.
The reason for rotating the reed switch 16 or the magnet 15 in this way is to improve detection accuracy and avoid erroneous detection.
That is, as is well known, the sensitivity distribution of the reed switch 16 is not uniform in terms of its sensitivity characteristics, the sensitivity varies, and there is a risk of erroneous detection. On the other hand, by rotating the reed switch 16 or rotating the magnet 15 in this way, the detection accuracy can be improved by avoiding erroneous detection, and the reliability of the alignment system can be improved.

Third, the signal transmission method in this case will be examined. As described above, when the reed switch 16 is rotated, a contact type may be used, but if it is a non-contact type, power feeding and signal transmission are performed as follows.
Both reed switches 16 are individually attached and supplied with power for detection based on the mutual induction action of electromagnetic induction between dedicated coils located at corresponding positions, and the ON / OFF change of the detection signals of both reed switches 16 is: Each of them is detected in a non-contact manner by utilizing the voltage change of the power supply side circuit that occurs individually as a result.
In other words, the reed switch 16 that is rotated is fed in a non-contact manner based on the electromagnetic induction effect between the coils. At the same time, the ON / OFF change in the reed switch 16 of the power receiving side circuit of the non-contact power supply appears as a voltage change of the power supply side circuit. For example, this is taken out using a CT coil and transmitted to the control unit 17. .
These are implemented, for example, by a device according to the above-described non-contact power feeding device of FIG. 5, and the load L in FIG. 5 corresponds to the reed switch 16, but unlike the example of FIG. The primary circuit 2 that is a circuit is also mounted on the vehicle. The power source 7 of the primary circuit 2 in FIG. 5 corresponds to the inverter 13 in FIG.

Fourth, the positional relationship of the coils will be examined. In the example shown in FIG. 1 and the like, the secondary side coil 5 on the vehicle B side and the like is supplied to the primary side coil 3 on the ground A side so as to correspond to each other in the vertical direction. Is not limited to this, and can be widely applied to various corresponding positional relationships between the two.
For example, the primary coil 3 is disposed not on the ground surface or road surface on the ground A side but on the wall surface on the ground A side, and the secondary coil 5 is not on the floor surface such as the vehicle B side but on the wheel B side. Cases that are disposed on the side surfaces, ceiling surface, back surface, front surface, etc. are conceivable. In these cases, the secondary side coil 5 is fed to the primary side coil 3 at a corresponding position diagonally, right and left, side by side, etc., but the present invention is also applicable to such a case. It is.

Fifth, the position of the reed switch 16 will be examined. In the illustrated example of FIG. 1 and the like, the center line D of both the reed switches 16 is along a front-rear direction (traveling direction) E of the vehicle B and the like, and a center line (not shown) along the front-rear direction E of the vehicle B. Although consistent, the alignment system of the present invention is not so limited.
For example, the center line D along the front-rear direction E of the reed switches 16 may be positioned at the side end of the vehicle B or the like. In this case, of course, both reed switches 16 are also arranged at the side ends. Further, the center line D may be directed in an oblique direction, not along the longitudinal direction E of the vehicle B or the like.

Sixth, the arrangement object of the reed switch 16 and the magnet 15 will be examined. In the example shown in FIG. 1 and the like, the magnet 15 is disposed on the ground A side and the reed switch 16 is disposed on the vehicle B side or the like, but the reverse is also possible.
That is, it is conceivable to arrange the magnet 15 on the vehicle B side or the like and the reed switch 16 on the ground A side. In this case, display transmission means for recognizing the positional deviation information in the control unit 17 based on the detection signal of the reed switch 16 on the ground A side on the vehicle B side or the like is attached to the ground A side.

Seventh, the arrangement of the rotating structure will be examined. A configuration in which the reed switch 16 or the magnet 15 is rotated as in the second case is conceivable, and a configuration in which the reed switch 16 is disposed on the ground A side as in the sixth case is also conceivable.
However, a configuration in which the magnet 15 or the reed switch 16 is rotated on the ground A side, that is, a configuration in which a rotating part and a movable part are provided on the ground, road surface, floor surface, etc., is difficult to install and maintenance is not easy. Therefore, it is better to adopt the configuration for rotating the magnet 15 and the reed switch 16 on the vehicle B side or the like.

Eighth, the adoption of the semiconductor sensor 23 and the like will be examined. In the alignment system of the present invention, as shown in FIG. 4, an AC-driven electromagnet 24 is used as the magnet 15, and a semiconductor sensor 23 having a semiconductor magnetoresistive element is used instead of the reed switch 16. Therefore, it is conceivable that the semiconductor sensor 23 detects the magnetic field of the electromagnet 24.
That is, as shown in the second example, a configuration in which the reed switch 16 and the magnet 15 are rotated is employed in the illustrated example of FIG. 3 in order to improve the detection accuracy of the reed switch 16 and improve the reliability of the alignment system. It was. However, a similar object can be achieved by employing the semiconductor sensor 23 and the electromagnet 24 as described above.
In the example of FIG. 4, the semiconductor sensor 23 is disposed on the vehicle B side and the electromagnet 24 is disposed on the ground A side, but the reverse is also possible. That is, the semiconductor sensor 23 may be disposed on the ground A side, and the electromagnet 24 may be disposed on the vehicle B side or the like.

DESCRIPTION OF SYMBOLS ₁ Non-contact electric power feeder 2 Primary side circuit 3 Primary side coil 4 Secondary side circuit 5 Secondary side coil 6 Battery 7 Power supply 8 Choke coil 9 Capacitor 10 Capacitor 11 Motor 12 Converter 13 Inverter 14 Capacitor 15 Magnet 16, 16 ₁ , 16 ₂ Reed switch 17 Control unit 18 Display unit 19 Motor 20 Driver 21 Pulley 22 Belt 23 Semiconductor sensor 24 Electromagnet 25 Power source A Ground B Vehicle C Power supply stand D Center line E Front / rear direction F Left / right direction G Air gap L Load P, P ₁ , P ₂ pulse

Claims (6)

Based on the mutual induction effect of electromagnetic induction, power is supplied from the primary coil placed on the ground side to the secondary coil mounted on the vehicle or other moving body, with the air gap in the corresponding position. In the non-contact power feeding device
A magnet is disposed on one of the mobile body side and the ground side, and a pair of reed switches are disposed on the other side. Entering the travel with the target that the secondary coil is positioned corresponding to the secondary coil,
Both the reed switches are arranged on both sides of the center line between them, and can detect both the magnetic field of the magnet with an air gap at the time of alignment before feeding,
When the magnet is positioned corresponding to the center line, the secondary coil is set in a relationship corresponding to the primary coil,
Based on detection signals of both the reed switches, it is possible to provide misalignment information indicating whether or not the secondary coil is in a corresponding position with respect to the primary coil. Power feeding device alignment system. In claim 1, the secondary coil is fed to the primary coil in a corresponding position in the vertical direction, and the center line is set along the front-rear direction which is the traveling direction,
Based on the detection signals of both the reed switches, it is possible to provide left and right positional deviation information as to whether or not the secondary side coil is in a corresponding position in the left and right direction with respect to the primary side coil. A contactless power feeding device alignment system.   2. The positioning system for a non-contact power feeding device according to claim 1, wherein a plurality of the magnets are arranged in series.   2. The positioning system for a non-contact power feeding device according to claim 1, wherein the positional deviation information can be provided based on a state of a pulse generated as a detection signal of both the reed switches. In claim 1, either one of the magnet and the reed switch is rotated during alignment before feeding,
When the reed switch is rotated, power is supplied to the reed switch of the power receiving circuit in a non-contact manner for detection based on the mutual induction action of electromagnetic induction between the attached and corresponding coils. An alignment system for a non-contact power feeding apparatus, wherein a switch detection signal is detected in a non-contact manner using a voltage change of a power feeding side circuit. In claim 1, an AC-driven electromagnet is used as the magnet, and a semiconductor sensor including a semiconductor magnetoresistive element is used in place of the reed switch, and the semiconductor sensor generates a magnetic field of the electromagnet. A non-contact power feeding device alignment system characterized by being capable of being detected.

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