JP2015122815A - Non-contact power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power transmission device capable of eliminating a foreign substance existent between a power supply device and a power reception device before the start of power transmission.SOLUTION: A power supply device 11 includes: a primary coil 16 generating a magnetic flux; a coil case 22 for covering the primary coil 16; and a case vertical movement unit 24 for lifting the coil case 22 so as to be placed close to the power reception device 12. The case vertical movement unit 24 performs elimination operation of a foreign substance 27 getting on the coil case 22, so that can eliminate the foreign substance 27 between the primary coil 16 and a secondary coil 18 without provision of a new device for eliminating the foreign substance 27, and can safely supply power with high efficiency by placing the primary coil 16 and the secondary coil 18 close to each other.

Description

  The present invention relates to a non-contact power transmission device used for charging an electric propulsion vehicle such as an electric vehicle or a plug-in hybrid vehicle.

  FIG. 5 is a schematic diagram showing a configuration of a conventional non-contact power transmission system 1. In FIG. 5, a power feeding device 2 connected to a power source for power transmission is disposed on the ground, and a power receiving device 3 is mounted on the electric propulsion vehicle. A primary coil 4 for power supply is provided inside the power supply device 2, and a secondary coil 5 for power reception is provided in the power reception device 3. The power feeding device 2 is provided with movable means 6 and moves the primary coil 4 from the “first arrangement” before power feeding to the “second arrangement” during power feeding. At the time of power feeding, when a magnetic flux is formed by supplying an alternating current to the primary coil 4 of the power feeding device 2, an induced electromotive force is generated in the secondary coil 5 of the power receiving device 3, thereby causing the secondary coil to move from the primary coil 4. Electric power is transmitted to 5 in a contactless manner.

  The power receiving device 3 is connected to, for example, an in-vehicle battery (not shown), and the electric power transmitted from the power feeding device 2 is charged into the in-vehicle battery as described above. A vehicle-mounted motor (not shown) is driven by the electric power stored in the vehicle-mounted battery. In addition, between the electric power feeder 2 and the power receiving apparatus 3, required information exchange is performed, for example with a radio | wireless communication apparatus (not shown), during non-contact electric power feeding.

JP 2010-183804 A

  Although the power feeding device 2 is installed in a garage or the like, it is assumed that the vehicle is stopped on the power feeding device 2 without noticing that a foreign object is placed on the power feeding device 2. The power feeding device 2 is brought close to the power receiving device 3 by the movable means 6 in order to improve the power transmission efficiency. However, when a foreign object is placed, the foreign material is sandwiched between the power feeding device 2 and the power receiving device 3, and the power feeding device 2 is connected to the power receiving device. The power feeding device 2 and the power receiving device 3 may be damaged.

  In particular, when power transmission is performed in a state where a metal object exists on the power supply device 2 as a foreign object, the metal object is overheated. In particular, when a foreign object such as a loop-shaped conductor capable of interlinking magnetic flux is inserted between the primary coil 4 and the secondary coil 5, an electromotive force is generated at both ends of the conductor. If the invading foreign matter is excessively heated, there is a possibility that the power feeding device 2 or the power receiving device 3 may be damaged such as a failure. From the above, it is required that no foreign matter exists between the primary coil 4 and the secondary coil 5 when performing power transmission.

  The present invention solves the above-described problem, and an object of the present invention is to provide a power feeding device that can remove foreign matter that has entered between a primary coil and a secondary coil before the start of power transmission.

In order to solve the above-described problem, according to one aspect of the present invention, a non-contact power transmission device including a power receiving device and a power feeding device that supplies power to the power receiving device in a contactless manner, the power feeding device uses magnetic flux. A primary coil that is generated, a coil case that covers the primary coil, and a case vertical movement part that raises the coil case so as to approach the power receiving device, and the case vertical movement part is an operation for removing foreign matters on the coil case It is set as the structure which performs.

  According to the present invention, the case up-and-down moving part performs the removal operation of the foreign matter riding on the coil case, so that the foreign matter between the primary coil and the secondary coil is not provided for removing the foreign matter. The primary coil and the secondary coil can be brought close to each other, and power can be supplied safely and with high efficiency.

Block diagram of a non-contact charging device according to the present invention External view of contactless power transmission device when supplying power Detailed view of coil case during foreign object removal operation Flowchart showing operation of case up-and-down moving unit and transmission power control Schematic diagram showing the configuration of a conventional non-contact power transmission system

  1st invention is a non-contact electric power transmission apparatus provided with a power receiving apparatus and the electric power feeder which supplies electric power to the said power receiving apparatus non-contacting, Comprising: The said electric power feeder is a primary coil which produces | generates magnetic flux, The said primary A coil case that covers the coil; and a case vertical movement portion that raises the coil case so as to approach the power receiving device, and the case vertical movement portion is configured to perform a removal operation of a foreign substance riding on the coil case. Is.

  Since the case vertical movement part removes foreign matter on the coil case, it can remove foreign matter between the primary coil and the secondary coil without providing a device for removing foreign matter, and the primary coil and secondary coil. By bringing the coils close to each other, it is possible to prevent foreign matter from entering during power supply. Further, by bringing the primary coil and the secondary coil close to each other, power can be supplied safely and efficiently.

  According to a second invention, in the first invention, the case vertical movement portion is constituted by a plurality of support arms that independently extend and contract while supporting the coil case, and the coil case is formed by varying the extension speed of the support arm. Is configured to perform the foreign substance removal operation.

  According to a third invention, in the second invention, the extension speed of the support arm is made different by decentering the center of gravity of the coil case from the central portion.

  According to a fourth aspect, in the third aspect, the center of gravity of the coil case is decentered by positioning the primary coil to the side of the coil case.

  According to a fifth invention, in the second invention, the support arm is configured to operate so as to apply vibration to the coil case in a state where the coil case is inclined, and more reliably remove foreign matter on the coil case. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a block diagram of a contactless charging apparatus according to the present invention. As shown in FIG. 1, the non-contact power transmission device 10 includes a power feeding device 11 installed in a parking space, for example, and a power receiving device 12 mounted in an electric propulsion vehicle, for example.

  The power supply device 11 includes a power supply unit 14 connected to the commercial power supply 13, an inverter unit 15, a primary coil 16, and a power supply device side control unit (for example, a microcomputer) 17. On the other hand, the power receiving device 12 includes a secondary coil 18, a rectifying unit 19, a load (battery) 20, and a power receiving side control unit (for example, a microcomputer) 21.

  In the power supply device 11, the commercial power source 13 is a 200 V commercial power source that is a low-frequency AC power source, and is connected to the input end of the power source unit 14. The output end of the power source unit 14 is connected to the input end of the inverter unit 15. The output end of the unit 15 is connected to the primary coil 16. On the other hand, in the power receiving device 12, the output end of the secondary coil 18 is connected to the input end of the rectifier 19, and the output end of the rectifier 19 is connected to the load 20. The primary coil 16 and the secondary coil 18 are connected by a magnetic field in a non-contact state, and power is supplied from the primary coil 16 to the secondary coil 18.

  The power feeding device side control unit 17 performs wireless communication with the power receiving device side control unit 21, and the power receiving device side control unit 21 determines a power command value according to the detected residual voltage of the load 20, and the determined power command value Is transmitted to the power supply apparatus side control unit 17. The power feeding device side control unit 17 compares the supplied power detected by the primary coil 16 with the received power command value, and drives the inverter unit 15 so that the power command value is obtained.

  During power feeding, the power receiving device side control unit 21 detects the power received by the secondary coil 18 and changes the power command value to the power feeding device side control unit 17 so that the load 20 is not overcurrent or overvoltage.

  FIG. 2 is an external view of a non-contact power transmission apparatus showing a power supply state. As shown in FIG. 2, the primary coil 16 of the power feeding device 11 is housed in a coil case 22. The coil case 22 is supported by a plurality of support arms 23, and moves up and down between a standby state (not shown) lowered onto the ground and a power supply state shown in FIG. It comes to move. Each of the plurality of support arms 23 extends and contracts independently, and has a configuration in which the coil case 22 is inclined by varying the extension speed of each of the plurality of support arms 23 in the middle of ascending. The foreign matter is removed by inclining. The case vertical movement portion 24 is constituted by the plurality of support arms 23.

  The power supply unit 14, the inverter unit 15, and the power feeding device side control unit 17 are housed in a power supply housing (not shown). On the other hand, the secondary coil 18 is accommodated in the secondary coil case 26 and attached to, for example, the bottom of the vehicle body (for example, a chassis).

  When power is transmitted from the power supply apparatus 11 to the power reception apparatus 12, the vehicle is appropriately moved to stop the power reception apparatus 12 so as to be positioned above the power supply apparatus 11. The vehicle height may change or incline depending on the state under the tire or the weight of the loaded luggage, and the position of the power receiving device 12 also varies depending on the vehicle height change or inclination.

  The coil case 22 is raised by the case vertical movement part 24. Since the case up-and-down moving part 24 is composed of a plurality of support arms 23 that extend and contract independently, the coil case 22 and the secondary coil case 26 even when the vehicle height changes or tilts. The primary coil 16 and the secondary coil 18 can be brought closest to each other.

  In this state, when the power feeding device side control unit 17 controls the drive of the inverter unit 15, a high-frequency electromagnetic field is formed between the primary coil 16 and the secondary coil 18. The power receiving device 12 takes out electric power from the high frequency electromagnetic field, and charges the battery as the load 20 with the taken out electric power.

  FIG. 3 is a detailed view of the coil case during the foreign substance removing operation.

  When the case up-and-down moving part 24 raises the coil case 22 to the contact state with the secondary coil case 26, the coil case 22 is shown in FIG. Tilt so big. Even when the foreign matter 27 exists on the coil case 22, the coil case 22 is inclined, so that the foreign matter 27 falls from the coil case 22 and is removed.

  Each of the support arms 23 is provided with a spring. Even when the vehicle height is lowered due to, for example, a person getting on the vehicle with the coil case 22 in contact with the secondary coil case 26, the coil case 22 The expansion / contraction state is changed by the load applied to the coil case 22 so that the secondary coil case 26 can maintain a light contact state.

  The primary coil 16 is disposed at a position shifted laterally from the center inside the coil case 22, and the center of gravity of the coil case 22 is eccentric from the center, so that a load applied from the coil case 22 to each support arm 23 is applied. Different. The plurality of support arms 23 are configured to raise the coil case 22 with the same driving force, but due to the deviation of the center of gravity of the coil case 22, the extension speed of the support arm 23 that raises the heavy side of the coil case 22 is slow. Thus, the coil case 22 is inclined. When foreign matter is placed on the coil case 22, the foreign matter 27 is dropped and removed by the inclination of the coil case 22.

  When the support arm 23 is further extended in a state where the coil case 22 is inclined, the end portion located on the upper side of the coil case 22 contacts the secondary coil case 26. The support arm 23 that supports the end side in contact with the secondary coil case 26 stops extending so that the contact pressure between the coil case 22 and the secondary coil case 26 does not increase beyond a predetermined pressure. The support arm 23 continues to extend.

  Due to the contact of the coil case 22 with the secondary coil case 26 and the change in the extension speed of each support arm 23 that raises the coil case 22, a sudden shaking occurs in the coil case 22. Since the coil case 22 shakes rapidly in an inclined state, the foreign matter 27 that has not dropped from the coil case 22 can be reliably dropped only by the coil case 22 being inclined.

  Each support arm 23 stops extending in a state where the upper surface of the coil case 22 is in contact with the secondary coil case 26 as shown in FIG.

  Next, control of the non-contact power transmission apparatus will be described with reference to the flowchart of FIG.

  In step S1 of the flowchart shown in FIG. 4, the battery in which the user mounts the power receiving device 12 is stopped at a position where the secondary coil case 26 of the power receiving device 12 faces the coil case 22, and the load 20 from the vehicle. Is instructed to charge, the power receiving device side control unit 21 transmits a power command value to the power feeding device side control unit 17.

  In step 2, when the power supply device side control unit 17 receives the power command value from the power reception device side control unit 21, the case vertical movement unit 24 is activated and the support arm 23 is extended. The driving force for extending each support arm 23 is set equally, but the center of gravity of the coil case 22 is biased, so the extension speed of the support arm 23 supporting the heavy side of the coil case 22 is the other support arm 23. The coil case 22 rises while gradually increasing the inclination angle. Even if the foreign matter 27 is present on the coil case 22, the coil case 22 is dropped and removed when the coil case 22 is inclined.

  In a state where the coil case 22 is inclined, the support arm 23 continues to extend, and an end portion located on the upper side of the coil case 22 contacts the secondary coil case 26. The support arm 23 that supports the end side in contact with the secondary coil case 26 stops extending so that the contact pressure of the coil case 22 to the secondary coil case 26 does not increase beyond a predetermined pressure. The support arm 23 continues to extend.

  Due to the contact of the coil case 22 with the secondary coil case 26 and the change in the extension speed of each support arm 23 that raises the coil case 22, a sudden shaking occurs in the coil case 22. Since the coil case 22 is shaken rapidly in a state where the coil case 22 is tilted, the foreign matter 27 that has not dropped from the coil case 22 can be reliably dropped only by tilting the coil case 22.

  In step S <b> 4, when the coil case 22 comes into close contact with the secondary coil case 26, the power feeding device side control unit 17 stops the case vertical movement unit 24.

  In step S <b> 5, the power supply device side control unit 17 instructs the inverter unit 15 to start power transmission, and starts power supply from the primary coil 16 to the secondary coil 18.

  In step S7, when there is no instruction to interrupt power transmission, the process proceeds to step S8, where the power receiving apparatus side control unit 21 determines whether or not charging is completed. If charging is not completed, the process returns to step S5. If the charging is continued and charging is completed, in step S9, the power receiving device side control unit 21 transmits a signal for ending power transmission to the power feeding device side control unit 17 to end the power supply.

  In step 10, the power feeding device side control unit 17 activates the case vertical movement unit 24 and lowers the coil case 22 by receiving the power transmission end signal from the power receiving device side control unit 21. Even when the support arm 23 contracts, the contraction speed of the support arm 23 that supports the heavy side of the coil case 22 becomes faster than the contraction speed of the other support arms 23, so that the coil case 22 descends in an inclined state. To do. Although dirt, water droplets, or the like attached to the secondary coil case 26 may adhere to the coil case 22, the coil case 22 falls due to the inclination.

  The coil case 22 is grounded from the heavy side and the support arm 23 supporting the heavy side stops the contraction operation, and the other support arms 23 continue the contraction operation. Due to grounding at one end of the coil case 22 and changes in the contraction operation of the support arm 23, the coil case 22 is vigorously shaken, and dirt, water droplets and the like attached to the upper surface of the coil case 22 are removed by this shake.

  In step 11, when the lowering of the coil case 22 is completed and the operation of the case vertical movement unit 24 is stopped, the operation of the non-contact power transmission apparatus 10 is completed.

  According to the present embodiment, the power feeding device 11 can remove the foreign matter 27 present on the coil case 22 before the coil case 22 is in close contact with the secondary coil case 26. Furthermore, since the coil case 22 is in close contact with the secondary coil case 26 during power transmission, the foreign matter 27 does not enter between the primary coil 16 and the secondary coil 18, and adverse effects caused by the foreign matter 27 can be prevented. .

  Although the present invention has been described with reference to the above-described embodiment, the present invention is not limited to the above-described embodiment.

As described above, the present invention can prevent the presence of foreign matter in the electromagnetic field region during power feeding from the power feeding device to the power receiving device, so that, for example, a person or an object may approach inadvertently or accidentally. This is useful for power supply to a power receiving device of an electric propulsion vehicle.

DESCRIPTION OF SYMBOLS 10 Non-contact electric power transmission apparatus 11 Power feeding apparatus 12 Power receiving apparatus 13 Commercial power supply 14 Power supply part 15 Inverter part 16 Primary coil 17 Power feeding apparatus side control part 18 Secondary coil 19 Rectification part 20 Load 21 Power receiving apparatus side control part 22 Coil case 23 Support Arm 24 Case vertical movement part 26 Secondary coil case 27 Foreign object

Claims (5)

A non-contact power transmission device comprising: a power receiving device; and a power feeding device that supplies power to the power receiving device in a contactless manner,
The power supply device includes a primary coil that generates magnetic flux, a coil case that covers the primary coil, and a case vertical movement unit that raises the coil case to approach the power receiving device,
The case up-and-down moving part is a non-contact power transmission device configured to perform a removing operation of foreign matters on the coil case.   The case up-and-down moving part is configured by a plurality of support arms that support the coil case and independently extend and retract, and the coil case is inclined by varying the extension speed of the support arm to remove foreign matters. The non-contact power transmission device according to claim 1, wherein the non-contact power transmission device is configured to perform.   The non-contact power transmission apparatus according to claim 2, wherein the extension speed of the support arm is made different by decentering the center of gravity of the coil case from a central portion.   The non-contact power transmission apparatus according to claim 3, wherein the center of gravity of the coil case is decentered by positioning the primary coil to a side of the coil case.   The non-contact power transmission apparatus according to claim 2, wherein the support arm is configured to operate so as to apply vibration to the coil case in a state where the coil case is inclined.