JP5255881B2 - Non-contact power feeding device - Google Patents

Description

  The present invention relates to a non-contact power supply apparatus that supplies power in a non-contact state using electromagnetic induction.

  Conventionally, as a power feeding device for driving a moving body that moves by being supplied with electric power, a power feeding line is provided along the moving direction of the moving body, and the power supplied to the power feeding line is not connected to the power feeding line. There is provided a non-contact power feeding device that receives power in a contact relationship and supplies power to a moving body. Such a non-contact power supply device is used for, for example, a power supply facility for supplying power to an automatic guided vehicle in a factory, like the non-contact power supply facility of Patent Document 1.

  On the other hand, the contact-type power supply device supplies power to a moving body that is displaced by sliding a movable contact connected to a load that supplies power to a fixed contact on a rail connected to a power source. In a power supply device of a type, leakage from a fixed contact, poor contact between contacts, or the like occurs. On the other hand, in the non-contact power feeding device, there is no contact between the primary side connected to the power source side and the secondary side connected to the load side. There will be no leakage or poor contact.

  The configuration of such a non-contact power supply apparatus will be briefly described with reference to the schematic diagram of FIG. The non-contact power supply apparatus shown in FIG. 9 is electrically connected to a power supply line 1 to which an alternating current having a high frequency is supplied from the AC power supply 100 and a load Z of a moving body (not shown) that can be displaced along the longitudinal direction of the power supply line 1. The power receiving unit 2 is connected to the power supply. The power receiving unit 2 includes a coil 21 through which an induction current flows by electromagnetic induction based on a high-frequency current flowing through the feeder line 1, an arm unit 22 around which the coil 21 is wound, and a connecting unit 23 that connects the arm unit 22. And the core 20 formed by the above.

  The core 20 is installed so as to surround the outer periphery of the feeder line 1 with the arm part 22 and the connecting part 23, so that a magnetic field is generated on the outer periphery side of the feeder line 1 that is generated when a high-frequency current (for example, 10 kHz) flows. A magnetic circuit is formed by the core 20 along the direction of. As described above, the magnetic circuit formed by the core 20 is formed on the outer periphery of the feeder line 1, so that the magnetic flux generated on the outer periphery side of the feeder line 1 is converged in the core 20.

  Therefore, a current is induced in the coil 21 wound around the arm portion 22 of the core 20 and is supplied to a load Z constituted by a motor or a control circuit of a moving body (not shown). At this time, the current generated in the coil 21 is converted into power by a power conversion circuit provided on the load Z side and then supplied to the load Z, so that stable power is supplied to the load Z. In the non-contact power feeding apparatus configured as described above, the power receiving unit 2 that performs a power receiving operation by electromagnetic induction based on a high-frequency current flowing through the power supply line 1 has various functions with respect to the core 20 and the coil 21 in order to increase the power receiving efficiency. The design is made.

Further, in the non-contact power supply device of Patent Document 2, when a core in which a coil is wound is installed between the reciprocating power supply lines, the interval between the power supply lines becomes wide, and the inductance due to the power supply lines is increased. The position where the coil is wound is determined so as not to increase. Specifically, by installing the coil on the side of the connecting part that connects the arm part of the core, structural interference between the power supply line and the coil can be prevented, and as a result, the power supply line sandwiching the arm part of the core Reduce the interval.
JP 2001-309502 A JP 2002-152901 A

  In order to simplify the construction of such a non-contact power feeding device, the core constituting the power receiving unit has a shape in which a part of the ring shape that is circulated in the circumferential direction of the power feeding line is cut out. Therefore, as described in Patent Document 2, the core is notched (corresponding to a gap between the opposite ends of the connecting portion 23 side of the arm portion 22 in the configuration of FIG. 9). Leakage magnetic flux is generated. Therefore, depending on the installation position of the coil with respect to the core, the influence of the leakage magnetic flux is increased, and as a result, the power receiving efficiency in the power receiving unit is reduced.

  In view of such a problem, an object of the present invention is to propose a non-contact power feeding device including a power receiving unit in which loss due to leakage magnetic flux generated at a notch portion of a core is suppressed.

In order to achieve the above object, a non-contact power supply device according to the present invention is installed in a non-contact state on a power supply line connected to an AC power source and supplied with an alternating current having a high frequency, and on the outer periphery of the power supply line. A non-contact power supply apparatus that supplies power received by electromagnetic induction with the power supply line to a load connected to the power reception unit, wherein the power reception unit surrounds the power supply line A core composed of a plurality of arm portions installed on one end of the arm portion and a connecting portion connected to one end portion of the arm portion to connect the arm portion; and provided in at least one of the arm portions, A power receiving coil constituted by a winding wound around the outer periphery of the arm portion, and the first arm portion at which the power receiving coil is installed among the arm portions is provided with the first coil. A leg portion extending toward the second arm portion that is installed across the power supply line with respect to the arm portion. And the height of the end portion of the leg portion on the second arm portion side with respect to the height direction of the first arm portion toward the second arm portion is the winding that constitutes the power receiving coil. The power receiving line is positioned higher than the height of the line, and the power supply line is located near the center of the ring shape formed by the arm part and the connecting part of the core. A partition plate is disposed adjacent to the leg portion so as not to leave a space with respect to the leg portion, and determines a position of the winding constituting the power receiving coil on the connecting portion side; The first arm portion is provided so as to be displaceable parallel to the longitudinal direction of the first arm portion.

  At this time, when the two arm portions are installed across the one feeder line, the core portion is formed in a C shape by the arm portion and the coupling portion. And only one of the two arm portions may be the first arm portion provided with the power receiving coil and the leg portion, or both of the two arm portions may be the first arm portion. Also good.

  Further, the three arm portions installed side by side may be configured to sandwich the two feeding lines, and a current flowing in the opposite direction may flow through each of the two feeding portions. In this case, the core is formed in an E shape by the arm portion and the coupling portion. Of the three arms, the one installed at the center may be the first arm, or all three arms may be the first arm.

In the non-contact power feeding device configured as described above, the influence of the leakage magnetic flux in the gap of the core configured on the leg side of the first arm portion is determined by the winding on the leg portion side of the power receiving coil. It becomes difficult to receive, and the power receiving efficiency can be improved.

  In addition, a spacer that fills the gap may be installed in the gap between the winding of the power receiving coil and the connecting portion in the first arm portion.

  Furthermore, in the above-described non-contact power feeding device, the amount of current due to the power receiving operation of the power receiving coil is reduced by the winding wound around the outer peripheral surface between the power receiving coil and the connecting portion in the first arm portion. A detection coil to be detected may be configured. Then, based on the current detected by the detection coil, the amount of current supplied to the load by the power receiving coil may be predicted to perform overcurrent protection of the load.

  According to the present invention, by configuring the leg portion at the end of the first arm portion where the power receiving coil is provided, the width of the gap provided in the core constituting the power receiving portion can be shortened. The spread of leakage magnetic flux can be reduced. In addition, by forming the leg portion in a shape extending to a position higher than the winding constituting the power receiving coil, the influence of the leakage magnetic flux from the end portion of the leg portion on the power receiving coil can be reduced. . Therefore, the power receiving efficiency from the power supply line in the power receiving unit can be increased.

<First Embodiment>
A contactless power supply device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the configuration of the contactless power feeding device of the present embodiment. In addition, in the component part in the non-contact electric power feeder shown in FIG. 1, the same code | symbol is attached | subjected about the part same as the component part in the non-contact electric power feeder shown in FIG.

  As shown in FIG. 1, the contactless power supply device of the present embodiment includes a power supply line 1 to which an alternating current having a high frequency is supplied and a power receiving unit 2 that is installed so as to surround the outer peripheral side of the power supply line 1. Composed. And the power receiving part 2 is equipped with the core 20 which comprises the magnetic circuit which converges the magnetic flux formed in the outer periphery of the feeder 1, and the coil 21 comprised by winding the electric wire connected to the load side. The coil 21 corresponds to a “power receiving coil” in the claims. In addition, the core 20 includes two arm portions 22 that are L-shaped and arranged symmetrically with respect to the power supply line 1, and a connecting portion 23 that connects the end portions of the two arm portions 22. It is configured in a C shape by a magnetic material such as ferrite or silicon steel.

  Each of the two arm portions 22 is a leg extending toward the end portion of the opposite arm portion 22 opposite to the end portion on the opposite side to the end portion connected to the connecting portion 23 with the feeder 1 interposed therebetween. By having the part 24, it is configured in an L shape. The leg portions 24 provided at the end portions of the arm portions 22 are formed so as to extend in a direction parallel to the connecting portion 23, and a gap is provided therebetween. By being configured in this manner, the core 20 has a shape in which a part of an annular shape surrounding the outer periphery of the feeder line 1 is cut out. Further, the feeder line 1 is disposed near the center of the ring shape formed by the arm portion 22 and the connecting portion 23 of the core 20.

  And since the gap | interval which cuts off the ring shape in this core 20 is provided between the leg parts 24 in the arm part 22, the width | variety of this gap | interval is larger than the space | interval of the arm part 22 installed on both sides of the electric power feeding part 1. Narrow. As described above, in the arm portion 22, the leg portion 24 is provided at the end portion opposite to the connection portion with the connecting portion 23, thereby narrowing the width of the gap (gap) d in the magnetic circuit formed by the core 20. Therefore, the amount of leakage magnetic flux toward the coil 21 caused by this gap can be suppressed. That is, since the magnetic flux is formed so as to connect between the end portions of the leg portions 24, the end portions of the leg portions 24 approach each other, so that the magnetic flux is easily formed in the direction in which the leg portions 24 extend, and the coil 21 side The amount of leakage magnetic flux that spreads out can be reduced.

  On the other hand, the coil 21 provided in each of the arm portions 22 of the core 20 includes a bobbin 25 having a circular column shape and a winding 26 formed of a conductive wire wound around the outer peripheral surface of the bobbin 25. The coil 21 has an arm 22 inserted into a hole in a bobbin 25 provided to form an annular column shape, so that an outer peripheral surface of the arm 22 between the connecting portion 23 and the leg 24 is A state equivalent to a structure in which the winding 26 is wound can be obtained. In addition, the winding 26 is wound around the outer peripheral surface of the bobbin 25 so as to overlap in the longitudinal direction of the bobbin 25 according to the number of turns, and thereby the winding 26 is directed in a direction perpendicular to the outer peripheral surface of the bobbin 25. Height is limited.

  The relationship between the leg part 24 and the coil | winding 26 in the power receiving part 2 comprised in this way is demonstrated below. When the surface of the arm portion 22 facing the feeder line 1 is used as a reference surface, as shown in FIG. 1, the height from the reference surface to the end of the leg portion 24 is H1, and the winding from the reference surface is The height of 26 is H2. At this time, the leg portion 24 is formed so that the height H1 of the leg portion 24 is higher than the height H2 of the winding 26. That is, the power receiving unit 2 is configured such that the height of the winding 26 is lower than the height of the groove portion formed by the arm portion 22, the connecting portion 23, and the leg portion 24.

  By being configured in this way, the winding 26 of the coil 21 is influenced by the magnetic flux spreading toward the arm portion 22 out of the leakage magnetic flux spreading from the end of the leg portion 24 toward the feeder line 1 side. Become. Since the amount of magnetic flux spreading toward the arm portion 22 is small, the influence on the winding 26 can be suppressed. Thereby, in the coil 21, since the influence of the leakage magnetic flux generated by the gap formed in the core 20 is suppressed, an increase in the resistance value of the winding 26 constituting the coil 21 can be prevented and the power receiving efficiency can be increased. it can.

  A schematic circuit configuration of the non-contact power feeding apparatus configured as described above is shown in the block diagram of FIG. As shown in FIG. 2, the power supply line 1 connected to the AC power supply 100 is the primary side, and the coil 21 configured in the power receiving unit 2 with respect to the power supply line 1 serving as the primary side is the secondary side coil. work. Then, the rectifier circuit 101 configured by a bridge circuit connected to the coil 21 serving as the secondary coil, and the smoothing circuit 102 that smoothes the output from the rectifier circuit 101, the coil 21 and the load Z Prepare in between.

  That is, an alternating current is generated in the coil 21 and supplied to the rectifier circuit 101 by electromagnetic induction with the power supply line 1 to which a high frequency current from the alternating current power supply 100 is applied. The rectifier circuit 101 rectifies the alternating current supplied from the coil 21 to convert the alternating current into a direct current so that power can be supplied to the load Z operated by the direct current power supply. Then, when converted into direct current by the rectifier circuit 101, smoothing by the smoothing circuit 102 is performed, so that power having a constant voltage can be supplied to the load Z.

  In the present embodiment, the coil 21 is provided for each of the two arm portions 22 sandwiching the single feeder 1, but the coil 21 may be provided on one arm portion 22. Good. At this time, the arm portion 22 provided with the coil 21 is provided with a leg portion 24 whose height H1 is higher than the height H2 of the winding 26.

  Further, the non-contact power feeding device may have a configuration in which each of the two power feeding lines 1 is surrounded by the core 20 in the power receiving unit 2 as illustrated in FIG. 3A or 3B. As shown in the schematic cross-sectional views of FIGS. 3A and 3B, the core 20 is formed in an E shape by connecting the three arm portions 22 with a connecting portion 23. At this time, each of the two power supply lines 1 is sandwiched between the two arm portions 22, and one arm portion 22 disposed in the center is sandwiched between the two power supply wires 1.

  When configured in this way, in order to make the direction of the magnetic field to the arm part 22 arranged in the center by each of the two power supply lines 1 the same direction, the high-frequency alternating current flowing through each of the two power supply lines 1 is , The current flows in the opposite phase so that the flow direction is reversed. In the configuration of FIG. 3A, the coil 21 is installed only on the arm portion 22 arranged at the center, and in the configuration of FIG. 3B, the coil 21 is installed on all three arm portions 22. Is done.

  When configured in this way, in order to obtain the effect according to the present embodiment, the arm portion 22 disposed in the center in either of the configurations of FIG. 3A and FIG. At the opposite end, two leg portions 24 extending toward the arm portions 22 on both sides thereof are provided, so that the cross section becomes a T-shape. Further, among the three arm portions 22 constituting the core 20, the arm portions 22 arranged on both sides of the arm portion 22 shown in FIG. 1 when the coil 21 is installed as shown in FIG. As in the case of L, the leg portion 24 is provided with a leg portion 24 at the end thereof. As shown in FIG. 3A, when the arm portions 22 where the coil 21 is not installed are installed on both sides, the arm portions 22 on both sides may have a shape without the leg portions 24.

<Second Embodiment>
The non-contact electric power feeder of 2nd Embodiment in this invention is demonstrated with reference to drawings. FIG. 4 is a schematic cross-sectional view showing the configuration of the contactless power feeding device of the present embodiment. In FIG. 4, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the contactless power supply device of this embodiment differs from the contactless power supply device (see FIG. 1) of the first embodiment in that the arm 26 has a winding 26 constituting the coil 21 as a leg. It becomes the structure installed in the part 24 side. That is, by increasing the interval S1 between the winding 26 and the connecting portion 23 in the arm portion 22, the interval S2 between the winding 26 and the leg portion 24 in the arm portion 22 is reduced. Since other configurations are the same as those of the first embodiment, the detailed description thereof is referred to the first embodiment, and is omitted in the present embodiment.

  As described above, the contactless power supply device according to the present embodiment has a configuration in which the end of the coil 21 on the leg 24 side of the coil 21 by the winding 26 is close to the leg 24, and thus occurs in the gap from the end of the leg 24. The influence on the coil 21 by the magnetic flux to be performed can be reduced. That is, the winding 26 constituting the coil 21 becomes a part of the magnetic circuit formed by the core 20. Then, by shortening the distance S2 between the end of the winding 26 on the leg 24 side and the leg 24, the space due to the space between the winding 26 and the leg 24 is reduced. It is possible to reduce the area where the leakage magnetic flux of the magnetic flux flows.

  By reducing the space in which the leakage magnetic flux wraps around, the leakage magnetic flux wraps around the leg 24 side of the winding 26 is reduced, so that the influence of the leakage magnetic flux from the leg 24 on the coil 21 can be suppressed. Therefore, with the configuration of the present embodiment, the power receiving efficiency in the power receiving unit 2 can be further increased than the configuration of the first embodiment. In order to suppress the influence of leakage magnetic flux from the leg 24 on the coil 21 as much as possible, it is preferable to set the interval S2 between the end of the winding 26 on the leg 24 side and the leg 24 to zero.

  In order to regulate the installation position of the winding 26 constituting the coil 21 as described above, for example, as shown in FIG. 4, a partition plate 27 is provided in contact with the end surface of the winding 26 on the connecting portion 23 side. It is good also as a structure. The installation position of the coil 21 by the winding 26 with respect to the longitudinal direction of the arm portion 22 is determined by using the ring-shaped partition plate 27 in which a hole through which the bobbin 25 passes is formed at the center. At this time, the partition plate 27 is fixed to the bobbin 25, so that the gap S1 between the winding 26 and the connecting portion 23 is widened and the gap between the winding 26 and the leg portion 24 is narrowed. The winding 26 constituting the coil 21 can be fixed by being sandwiched by the partition plate 27.

  The partition plate 27 that determines the position of the winding 26 on the connecting portion 23 side may be configured to be slidable in the longitudinal direction of the arm portion 22. At this time, for example, by arranging a plurality of grooves for locking the inner peripheral surface of the hole portion of the partition plate 27 in the longitudinal direction of the bobbin 25, the partition plate 27 is optimal in the longitudinal direction of the arm portion 22. Can be fixed in position. That is, when the partition plate 27 is moved in the longitudinal direction with respect to the bobbin 25, the hole of the partition plate 27 is formed in the groove corresponding to the optimum position according to the length of the winding 26 constituting the coil 21. The partition plate 27 is locked to the bobbin 25 by fitting the inner peripheral portion.

  By providing a structure for locking the partition plate 27 to the bobbin 25, the partition plate 27 is fixed to the bobbin 25 in order to fix the winding 26 at a position where the distance between the winding 26 and the leg portion 24 is the shortest. can do. The structure for locking the partition plate 27 to the bobbin 25 has been described by taking an example in which a groove is provided on the outer peripheral surface of the bobbin 25. However, the structure is not limited to the structure provided with the groove. Other structures may be used as long as the structure can be locked when the plate 27 is slid with respect to the longitudinal direction of the arm portion 22.

  Further, as in the configuration shown in FIG. 6, instead of the partition plate 27 of FIG. 5, by using a spacer 28 that abuts both the winding 26 and the connecting portion 23, the connecting portion 23 side of the winding 26 is used. It is good also as what determines the position of. Like the partition plate 27 in FIG. 5, the spacer 28 has a ring-shaped cross-section in which a hole that penetrates the bobbin 25 is formed at the center thereof, and the ring-shaped cross-section is continuous in the longitudinal direction of the arm portion 22. It is configured as an annular column shape.

  In this way, the spacer 28 that determines the position of the winding 26 on the connection portion 23 side has a length along the longitudinal direction of the arm portion 22, and the interval S 1 between the winding 26 constituting the coil 21 and the connection portion 23. Is the same length as At this time, the spacer 28 having the length S1 may be installed between the winding 26 and the connecting portion 23 to determine the position of the winding 26 on the connecting portion 23 side. Further, by installing only n spacers 28 having a length S1 / n (n is a natural number) between the winding 26 and the connecting portion 23, the position of the winding 26 on the connecting portion 23 side is determined. It may be a thing.

  In order to prevent the partition plate 27 and the spacer 28 used to determine the position of the winding 26 in each of FIGS. 5 and 6 from affecting the magnetic field generated by the feeder 1, respectively. It is preferably composed of a non-magnetic material. And in order to avoid an electrical influence, it is desirable that each of the partition plate 27 and the spacer 28 is made of an insulator.

  Also in this embodiment, as in the first embodiment, it is not necessary to have a configuration in which the coils 21 are provided on all the arm portions 22, or as shown in FIG. 3 (a) or FIG. 3 (b). The power receiving unit 2 including the E-shaped core 20 may be applied. At this time, in this embodiment, with respect to the arm portion 22 provided with the coil 21 by the winding 26, as described above, the interval between the connecting portion 23 and the winding 26 is widened, The winding 26 is wound so as to narrow the distance from the winding 26.

<Third Embodiment>
The non-contact electric power feeder of 3rd Embodiment in this invention is demonstrated with reference to drawings. FIG. 7 is a schematic cross-sectional view showing the configuration of the non-contact power feeding device of the present embodiment. In FIG. 7, the same components as those shown in FIG. 5 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 7, the contactless power supply device of the present embodiment is different from the contactless power supply device (see FIG. 5) of the second embodiment in the arm portion 22 between the partition plate 27 and the connecting plate 23. In addition, the winding 26a constituting the current detection coil 21a is installed. That is, when the space | interval used as S1 is provided between the coil | winding 26 and the connection part 23 by the partition plate 27 like 2nd Embodiment, it winds in the area | region of the outer peripheral surface of the bobbin 25 corresponding to this space | interval. A coil 21a is formed by winding 26a. Since other configurations are the same as those of the second embodiment, the detailed description thereof will be referred to the second embodiment and will be omitted in this embodiment.

  Therefore, in the non-contact power feeding device shown in FIG. 7, the winding 26 is wound on the leg portion 24 side with the partition plate 27 sandwiched on the outer peripheral surface of the bobbin 25, and the power receiving coil 21 is configured. A coil 26a for current detection is configured by winding a winding 26a on the connecting portion 23 side. That is, the coil 21a corresponds to the “detection coil” in the claims. Note that the number of turns of the winding 26 a constituting the coil 21 a is determined by the length in the longitudinal direction of the arm portion 22 and the number of turns of the winding 26 constituting the coil 21.

  In the non-contact power feeding apparatus configured as described above, as described in the second embodiment, the partition plate 27 may be fixed to the outer peripheral surface of the bobbin 25, or the partition plate 27 may be configured in the longitudinal direction of the bobbin 25. It is good also as a structure which can be slid. And this partition plate 27 is comprised with a nonmagnetic material so that it may not affect the magnetic field which generate | occur | produces with respect to the power receiving part 2, like the partition plate 27 and the spacer 28 in 2nd Embodiment. . Moreover, in order to avoid an electrical influence, it is desirable that the partition plate 27 is made of an insulator.

  Further, when the partition plate 27 is slidable in the longitudinal direction of the bobbin 25, as in the second embodiment, the partition plate 27 is locked to the outer peripheral surface of the bobbin 25 and can be fixed at an arbitrary position. Also good. In this embodiment, since the partition plate 27 is sandwiched between the windings 26 and 26a, the position of the winding 26 with respect to the longitudinal direction of the bobbin 25 is determined by the slidable partition plate 27, and then the winding is performed. The partition plate 27 may be fixed by winding 26a.

  A schematic circuit configuration of the non-contact power feeding apparatus configured as described above is shown in a block diagram of FIG. In FIG. 8, the same components as those shown in FIG. 2 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 8, the contactless power supply device of the present embodiment is a current / voltage conversion circuit that converts a current supplied from a coil 21 a installed for current detection into a voltage signal with respect to the configuration of FIG. 2. 103, a comparator 104 that receives the voltage signal from the current / voltage conversion circuit 103 and compares it with the threshold voltage Vth, and an amount of current supplied from the smoothing circuit 102 to the load Z based on the output from the comparator 104 The overcurrent protection circuit 105 for limiting the above is added.

  With this configuration, as described in the first embodiment, when an alternating current is generated in the coil 21 due to electromagnetic induction with the power supply line 1 to which a high-frequency current from the alternating current power supply 100 is applied, similarly. An alternating current is also generated in the coil 21a. The alternating current generated in the coil 21 is rectified by the rectifier circuit 101 and then smoothed by the smoothing circuit 102, so that direct current power is supplied to the load Z via the overcurrent protection circuit 105.

  On the other hand, when the alternating current generated in the coil 21a is supplied to the current / voltage conversion circuit 103, a voltage signal corresponding to a voltage value integrated every predetermined time is obtained by rectification and smoothing. It is output to the comparator 104. The comparator 104 compares the voltage value based on the voltage signal from the current / voltage conversion circuit 103 with the threshold voltage Vth, and when the voltage signal from the current / voltage conversion circuit 103 becomes larger than the threshold voltage Vth, the overcurrent A signal for causing the protection circuit 105 to function is output.

  That is, when the power received by the power receiving unit 2 with respect to the power supply line 1 increases, the amount of alternating current generated by the coil 21 increases and the amount of alternating current generated by the coil 21a increases. At this time, the direct current power source in which the alternating current from the coil 21 is converted by the rectifier circuit 101 and the smoothing circuit 102 has a constant voltage value, but the current value increases as the power increases. Therefore, the amount of current supplied to the load Z increases, and the current supplied to the load Z becomes an overcurrent.

  In order to prevent such an overcurrent to the load Z, the overcurrent protection circuit 105 is configured by a parallel circuit that is in parallel with the load Z by a resistor or the like, for example. Therefore, as described above, when the voltage signal from the current / voltage conversion circuit 103 increases and a signal is given from the comparator 104 to the overcurrent protection circuit 105, the overcurrent protection circuit 105 is configured. The parallel circuit is electrically connected to the load Z.

  Then, by operating this overcurrent protection circuit 105, in a state where the voltage applied to the load Z is kept constant, a part of the current output from the smoothing circuit 102 is caused to flow to the overcurrent protection circuit 105 side, This prevents the current supplied to the load Z from becoming an overcurrent. When configured as shown in FIG. 8, a differential amplifier circuit that obtains the difference between the voltage value based on the voltage signal from the current / voltage conversion circuit 103 and the threshold voltage may be installed instead of the comparator 104. At this time, when the power received by the coil 21 is changed by changing the resistance value of the resistor in the parallel circuit constituting the overcurrent protection circuit 105 according to the difference value from the differential amplifier circuit. In this case, the amount of current supplied to the load Z can be kept constant.

  In this embodiment as well, as in the first and second embodiments, the configuration may not be such that all the arm portions 22 are provided with the coils 21, or FIG. 3 (a) or FIG. 3 (b). It is good also as what is applied to the power receiving part 2 provided with the E-shaped core 20 as shown in FIG. At this time, in the present embodiment, as in the second embodiment, the arm portion 22 provided with the coil 21 by the winding wire 26 is wound so that the distance from the connecting portion 23 is widened as described above. 26 is wound, and a winding 26a is wound between the winding 26 and the connecting portion 23 to form a coil 21a.

  At this time, each of the arm portions 22 provided with the coils 21 may be provided with a coil 21a constituted by the winding 26a, or a portion of the arm portion 22 provided with the coil 21 is provided with a coil 21a constituted by the winding 26a. It may be a thing. In addition, when each of the arm portions 22 provided with the coils 21 is provided with the coil 21a by the winding 26a, the amount of current supplied to each of the plurality of coils 21 is supplied to the same arm portion 22 as the coil 21. It can be detected by the provided coil 21a.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a non-contact power supply apparatus that uses a power supply line to supply power to a moving body that acquires power using electric power and drives it.

These are schematic sectional drawings which show the structure of the non-contact electric power feeder of the 1st Embodiment of this invention. These are block diagrams which show the circuit structure of the non-contact electric power feeder of FIG. Shows a configuration of a non-contact power supply device using two power supply lines, (a) is a schematic cross-sectional view of a configuration example in which a coil is provided on one arm part, (b) is all It is a schematic sectional drawing by the structural example by which the coil was provided in the arm part. These are schematic sectional drawings which show the structure of the non-contact electric power feeder of the 2nd Embodiment of this invention. These are schematic sectional drawings which show the structural example which used the partition plate for the non-contact electric power feeder of FIG. These are schematic sectional drawings which show the structural example which used the spacer for the non-contact electric power feeder of FIG. These are schematic sectional drawings which show the structure of the non-contact electric power feeder of the 3rd Embodiment of this invention. These are block diagrams which show the circuit structure of the non-contact electric power feeder of FIG. These are the schematic perspective views which show the structure of the whole non-contact electric power feeder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Feed line 2 Power receiving part 20 Core 21 and 21a Coil 22 Arm part 23 Connection part 24 Leg part 25 Bobbin 26 and 26a Winding 27 Partition plate 28 Spacer 100 AC power supply 101 Rectifier circuit 102 Smoothing circuit 103 Current / voltage conversion circuit 104 Comparator 105 Overcurrent protection circuit

Claims (3)

A power supply line connected to an AC power supply and supplied with an alternating current having a high frequency, and a power receiving unit installed in a non-contact state on the outer periphery of the power supply line, the power receiving unit electromagnetic induction with the power supply line In the non-contact power feeding device that supplies the power received by the power receiving unit connected to the power receiving unit,
The power receiving unit is
A core composed of a plurality of arm portions installed at positions surrounding the power supply line, and a connecting portion connected to one end portion of the arm portion and connecting the arm portion;
A power receiving coil that is provided on at least one of the arm portions and includes a winding wound around an outer periphery of the arm portion;
Have
A leg extending toward the second arm portion installed on the end portion of the first arm portion where the power receiving coil of the arm portions is installed with the power supply line sandwiched with respect to the first arm portion. And providing a part
The height of the end of the leg on the second arm portion side with respect to the height direction of the first arm toward the second arm is the height of the winding constituting the power receiving coil. Higher than
The installation position of the feeder line is set near the center of an annular shape constituted by the arm portion and the connecting portion of the core,
In the longitudinal direction of the first arm portion, the winding of the power receiving coil is installed adjacent to the leg portion so as not to leave a space,
A non-contact power feeding device comprising: a partition plate for determining a position of the winding constituting the power receiving coil on the side of the connecting portion so as to be displaceable in parallel with a longitudinal direction of the first arm portion . In claim 1,
A detection coil for detecting a current amount due to a power receiving operation of the power receiving coil is configured by a winding wound around an outer peripheral surface between the power receiving coil and the connecting portion in the first arm portion. A non-contact power feeding device. In claim 1,
A contactless power feeding device according to claim 1, wherein a spacer for filling the gap is provided in a gap between the winding of the power receiving coil and the connecting portion in the first arm portion.

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