WO2019221270A1 - Unité bobine de transmission d'énergie - Google Patents

Unité bobine de transmission d'énergie Download PDF

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Publication number
WO2019221270A1
WO2019221270A1 PCT/JP2019/019664 JP2019019664W WO2019221270A1 WO 2019221270 A1 WO2019221270 A1 WO 2019221270A1 JP 2019019664 W JP2019019664 W JP 2019019664W WO 2019221270 A1 WO2019221270 A1 WO 2019221270A1
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Prior art keywords
coil
variable
power transmission
power
coils
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PCT/JP2019/019664
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English (en)
Japanese (ja)
Inventor
真 高宮
浩 邸
義哲 成末
圭博 川原
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国立大学法人東京大学
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Publication of WO2019221270A1 publication Critical patent/WO2019221270A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type

Definitions

  • the present invention relates to a power transmission coil unit, and more particularly, to a power transmission coil unit used in a power supply device that supplies power to a power reception device having a power reception coil in a contactless manner.
  • a power transmission unit that includes a first power transmission coil and a second power transmission coil and a plurality of capacitors and that supplies power to a power reception device including the first power reception coil and the second power reception coil.
  • the first power transmission coil is configured to be magnetically coupled to the second power transmission coil.
  • the second power transmission coil is configured to be magnetically coupled to the first power transmission coil and the first power reception coil.
  • the second power receiving coil is configured to be magnetically coupled to the first power receiving coil.
  • the number of turns of the first power transmission coil is changed according to the load resistance of the power receiving device by changing the first power transmission coil to a variable number of turns coil, and the impedance of the power transmission coil unit is changed.
  • the power feeding efficiency from the power transmission coil unit, that is, the power feeding device to the power receiving device is improved.
  • the main purpose of the power transmission coil unit of the present invention is to suppress a decrease in power supply efficiency from the power supply device to the power reception device when the distance between the power reception coil of the power reception device and the variable coil device of the power transmission coil unit changes.
  • the power transmission coil unit of the present invention employs the following means in order to achieve the main object described above.
  • the power transmission coil unit of the present invention is A power transmission coil unit used in a power feeding device that feeds power in a contactless manner to a power receiving device having a power receiving coil, A variable coil device having a variable coil diameter; A variable capacitor device connected to the variable coil device and having a variable capacitance; The variable coil device is controlled so that the coil diameter of the variable coil device increases as the distance between the power receiving coil and the variable coil device increases, and the capacity according to the coil diameter of the variable coil device is set.
  • a control device for controlling the variable capacitor device It is a summary to provide.
  • a variable coil device having a variable coil diameter and a variable capacitor device connected to the variable coil device and having a variable capacity are provided, and the distance between the power receiving coil and the variable coil device is The variable coil device is controlled so that the coil diameter of the variable coil device increases as the size increases, and the variable capacitor device is controlled so as to have a capacity corresponding to the coil diameter of the variable coil device.
  • the “coil diameter” is a length that reflects the size of a region where magnetic flux is generated in the variable coil device. Therefore, the coil diameter of the variable coil device can be changed and the capacitance of the variable capacitor can be changed as the distance between the power receiving coil and the variable coil device changes.
  • the coil diameter of the variable coil device tends to increase as the distance between the power receiving coil and the variable coil device increases, and the capacity of the variable capacitor apparatus is set to a capacity corresponding to the coil diameter of the variable coil apparatus.
  • the variable coil device includes a plurality of coils having different coil diameters arranged so as to be concentric with each other, and the variable capacitor device includes a plurality of capacitors and a plurality of the coils.
  • a connection release device capable of connecting and disconnecting the plurality of capacitors, and the control device has a coil diameter that increases as a distance between the power receiving coil and the variable coil device increases.
  • a power transmission coil may be selected from the plurality of coils so as to increase, and the connection release device may be controlled such that a corresponding capacitor corresponding to the power transmission coil among the plurality of capacitors is connected to the power transmission coil.
  • the coil used as a power transmission coil among several coils can be changed by controlling a connection release apparatus. If it carries out like this, when the distance between a power receiving apparatus and the variable coil apparatus of a power transmission coil unit changes, the fall of the power feeding efficiency from a power feeding apparatus to a power receiving apparatus can be suppressed.
  • the variable coil device has two circular coils with different radii arranged so as to be concentric with each other, and a radius of a large coil having a large coil diameter of the two coils is the receiving coil.
  • variable coil device is adjusted to have a maximum distance that is the maximum value of the distance range that can be taken, and the radius of the small coil with the small coil diameter of the two coils is the coil diameter of the large coil. It may be adjusted so as to be a half of.
  • the control device may detect a distance between the power reception coil and the variable coil device based on a mutual inductance between the power reception coil and the variable coil device, An imaging device that captures an image including a power receiving coil and the variable coil device may be provided, and the control device may detect a distance between the power receiving coil and the variable coil device based on the captured image. In this way, when the distance between the power receiving device and the variable coil device of the power transmission coil unit changes, the distance between the power reception device and the variable coil device of the power transmission coil unit can be detected more efficiently. , It is possible to suppress a decrease in power supply efficiency from the power supply device to the power reception device
  • FIG. 6 is an explanatory diagram for explaining a state in which switches SW1 to SW4 are connected to coils TX1 to TX4.
  • 3 is a flowchart showing an example of a switch control routine executed by a CPU of the control device 28.
  • the relationship between the value obtained by dividing the optimum value r tx, opt obtained by using the equation (7) by the distance d and the distance d, and the optimum value r tx, opt obtained by using the equation (8) are divided by the distance d.
  • It is explanatory drawing which shows an example of the relationship between measured value and distance d.
  • FIG. 6 is an explanatory diagram showing an example of a relationship between a distance d at which efficiency ⁇ is good and coils TX1 to TX4. It is a block diagram which shows the outline of a structure of the electric power feeder 120 provided with the power transmission coil unit 122 of 2nd Example. It is explanatory drawing for demonstrating the structure of the variable coil apparatus. It is a flowchart which shows an example of the switch control routine performed by CPU of the control apparatus 28 of 2nd Example. It is explanatory drawing which shows an example of the relationship between efficiency (eta) when the power transmission coil TX is made into coil TX2, vertical deviation
  • FIG. It is explanatory drawing which shows an example of the relationship between the maximum value of average efficiency (eta) av, and the number of coils of the variable coil apparatus 124.
  • FIG. It is explanatory drawing for demonstrating the outline of a structure of the variable coil apparatus 224 of a modification. It is explanatory drawing for demonstrating the outline of a structure of the variable coil apparatus 324 of a modification.
  • FIG. 1 is a configuration diagram illustrating an outline of a configuration of a power feeding device 20 including a power transmission coil unit 22 according to a first embodiment of the present invention.
  • FIG. 2 is an explanatory diagram for explaining how the switches SW1 to SW4 are connected to the coils TX1 to TX4.
  • the lower part is an image showing a state in which the switches SW1 to SW4 are connected to the coils TX1 to TX4, and the upper part is an image of copper wires constituting the coils TX1 to TX4.
  • the power feeding device 20 is configured as a device that supplies power to the power receiving device 10 including a power receiving coil RX wound with a copper wire in a non-contact manner, and includes a power transmission coil unit 22 and an AC voltage source 30.
  • the power receiving coil RX of the power receiving apparatus 10 is a circular helical coil having a radius r (hereinafter sometimes referred to as a “radius”) r RX and a number n of turns, in which a copper wire is wound around an insulator (for example, styrofoam). It is formed as.
  • the radius r RX and the number of turns n of the power receiving coil RX are appropriately determined according to the specifications of the power receiving device 10.
  • One end of the capacitor CRX is connected to one end of the power receiving coil RX, and one end of the load resistor RL is connected to the other end.
  • the other end of the load resistor RL is connected to the other end of the capacitor CRX.
  • the power transmission coil unit 22 includes a variable coil device 24, a variable capacitor device 26, an imaging device 27, and a control device 28.
  • the variable coil device 24 includes coils TX1 to TX4.
  • the coils TX1 to TX4 have a winding number m in which a copper wire is wound around an insulator Tins (for example, styrofoam) so as to be concentric. It is formed as a coil.
  • the radii RTX1 to RTX4 are adjusted to increase in the order of the radii RTX1, RX2, RX3, and RTX4 within a range of distances that the coils TX1 to TX4, that is, the variable coil device 24 and the power receiving coil RX of the power receiving device 10 can take. Has been.
  • the radii RTX1 to RTX4 can be appropriately determined within a range longer than the radius r RX of the power receiving coil RX.
  • One ends of the coils TX1 to TX4 are connected to the power bus L1 of the power buses L1 and L2 of the voltage source 30.
  • the other ends of the coils TX1 to TX4 are connected to the switches SW1 to SW4.
  • the coils TX1 to TX4 are formed of copper wire, but any wire member having conductivity may be used.
  • the variable capacitor device 26 includes switches (connection release devices) SW1 to SW4 and capacitors C1 to C4.
  • the switches SW1 to SW4 are provided between the coils TX1 to TX4 and the capacitors C1 to C4.
  • the switches SW1 to SW4 are turned on to connect the coils TX1 to TX4 and the capacitors C1 to C4, and are turned off to turn on the coils TX1 to TX4. The connection between TX4 and the capacitors C1 to C4 is released.
  • the switches SW1 to SW4 are controlled by the control device 28.
  • the capacitors C1 to C4 are connected between the power bus L2 of the voltage source 30 and the switches SW1 to SW4.
  • the capacitors CP1 to CP4 of the capacitors C1 to C4 are connected to the impedance LRX of the power receiving coil RX of the power receiving device 10 and the power receiving coil RX by the product of the impedances LTX1 to LTX4 of the coils TX1 to TX4 connected via the switches SW1 to SW4. It is adjusted to be the same as the product of the capacitor CRX.
  • the imaging device 27 is configured as a device that outputs an image of an object such as a digital still camera.
  • the imaging device 27 is controlled by the control device 28.
  • control device 28 is configured as a microprocessor centered on a CPU.
  • a ROM for storing a processing program
  • a RAM for temporarily storing data
  • an input / output port and a communication port are provided.
  • An image signal Pic or the like from the imaging device 27 is input to the control device 28 via an input port.
  • Various control signals such as a switch control signal for controlling on / off of the switches SW1 to SW4 and a drive signal for driving the imaging device 27 are output from the control device 28 through an output port.
  • any one of the switches SW1 to SW4 is turned on and all the other switches are turned off, and the voltage source 30 energizes any one of the coils TX1 to TX4.
  • the power transmission coil TX is used, and power is supplied to the power reception device 10 in a non-contact manner by magnetic coupling between the power transmission coil TX and the power reception coil RX of the power reception device 10.
  • the coils TX1 to TX4 have different radii RTX1 to RTX4. Therefore, the variable coil device 24 functions as a device in which the radius r TX of the power transmission coil TX , that is, the coil diameter changes in accordance with the on / off of the switches SW1 to SW4.
  • FIG. 3 is a flowchart showing an example of a switch control routine executed by the CPU of the control device 28. This routine is repeatedly executed every predetermined time (for example, every second).
  • step S100 the CPU of the control device 28 executes a process of detecting the distance d between the variable coil device 24 of the power transmission coil unit 22 and the power receiving coil RX of the power feeding device 20 (step S100).
  • step S100 a drive signal is transmitted to the imaging device 27 so that an image including at least a part of the coils TX1 to TX4 of the power transmission coil unit 22 and at least a part of the power reception coil RX of the power reception device 10 is captured.
  • the imaging device 27 is controlled. The distance d between the variable coil device 24 and the receiving coil RX is detected from the image thus obtained.
  • one power transmission coil TX is selected from the coils TX1 to TX4 using the detected distance d (step S110).
  • the coil TX1 to TX4 is selected so that the larger the distance d, the larger the radius becomes.
  • efficiency ⁇ the power transmission efficiency ⁇ from the power feeding device 20 to the power receiving device 10
  • efficiency ⁇ is a quality factor Q TX power transmission coils TX, and quality factor Q TX receiving coil RX, the receiving coil RX And the coupling coefficient k between the power transmission coil TX and the power transmission coil TX.
  • the value (k 2 ⁇ Q TX ⁇ Q RX ) shown in the following equation (1) becomes the minimum value at the resonance frequency f0, and the efficiency ⁇ can be set to the maximum value.
  • “ ⁇ ” is the conductivity of the metal (copper in the embodiment) constituting the power transmission coil TX and the power reception coil RX.
  • A is the cross-sectional area of the current flowing in the metal and takes into account the skin effect.
  • M is a mutual inductance between the power transmission coil TX and the power reception coil RX.
  • M and n are the number of turns of the power transmission coil TX and the power reception coil RX.
  • the mutual inductance M can be derived from the following equation (2).
  • ⁇ 0 is magnetic permeability.
  • K is a complete elliptic integral represented by the following equation (3).
  • E is a complete elliptic integral represented by the following equation (4).
  • equation (2) the physical thickness of the power transmission coil TX and the power reception coil RX is assumed to be 0.
  • Equation (1) can be simplified as the following equation (6).
  • the resonance frequency f0, the number of turns m and n, the radius r RX , and the distance d are constants. Therefore, the optimum value r tx radius r TX power transmission coils TX is shown by the following equation (7), when it is opt, that is, when the radius r TX is the distance d, the value (k 2 Q TX Q TX) is The maximum value.
  • the optimum value r tx, opt can be derived by solving the following equation (8).
  • FIG. 4 shows the relationship between the distance d obtained by dividing the optimum value r tx, opt obtained using the equation (7) by the distance d, and the optimum value r tx, opt obtained using the equation (8). It is explanatory drawing which shows an example of the value divided
  • the resonance frequency f0 is 13.56 MHz
  • the number of turns m and n is 5, the value 3, and the radius r RX is 20 mm.
  • the equation (7) is a very good approximation when the distance d exceeds the predetermined distance d0 (30 mm in FIG. 4), and the relationship of the equation (7) may be used. I understand that there is no. Therefore, by setting the radius r TX power transmission coils TX and distance d, the power transmission efficiency ⁇ from the power feeding device 20 to the power receiving device 10 can be maximized.
  • the switch SW1 ⁇ SW4 discrete not be a continuous value a radius r TX power transmission coils TX It must be a good value.
  • the relationship between the distance d and the coil TX1 ⁇ TX4 efficiency ⁇ is improved in advance Then, the power transmission coil TX is selected from the coils TX1 to TX4 using this relationship and the distance d.
  • FIG. 5 is an explanatory diagram showing an example of the relationship between the distance d at which the efficiency ⁇ is good and the coils TX1 to TX4.
  • white square marks show an example (comparative example 1) of the relationship between the distance d and the efficiency ⁇ when the power transmission coil TX is the coil TX1.
  • White circles show an example (comparative example 2) between the distance d and the efficiency ⁇ when the power transmission coil TX is the coil TX2.
  • White triangles indicate an example (comparative example 3) of the relationship between the distance d and the efficiency ⁇ when the power transmission coil TX is the coil TX3.
  • White inverted regular triangle marks show an example (comparative example 4) of the relationship between the distance d and the efficiency ⁇ when the power transmission coil TX is the coil TX4.
  • the black pentagon mark indicates the relationship between the distance d and the efficiency ⁇ when the coil having the greatest efficiency ⁇ at the distance d among the TX1 to TX4 is selected as the power transmission coil TX, that is, the distance d and the efficiency in the first embodiment.
  • An example (example) of the relationship with ⁇ is shown.
  • the efficiency ⁇ can be improved by selecting a coil having a larger radius (coil diameter) among the coils TX1 to TX4 as the distance d increases. Accordingly, in the embodiment, the power transmission coil TX is selected from the coils TX1 to TX4 based on the relationship between the distance d and the black pentagon mark.
  • step S120 when the power transmission coil TX is selected, only the switch connected to the selected power transmission coil TX among the switches SW1 to SW4 is turned on (step S120), and this routine is terminated. Accordingly, the corresponding capacitor corresponding to the power transmission coil TX among the capacitors C1 to C4 is connected to the power transmission coil TX, and the power transmission coil TX is energized to supply power to the power receiving device 10 in a non-contact manner.
  • Capacitors CP1 to CP4 of the capacitors C1 to C4 are obtained by multiplying the impedances LTX1 to LTX4 of the coils TX1 to TX4 connected via the switches SW1 to SW4 by the impedance LRX of the power receiving coil RX of the power receiving device 10 and the capacitors of the power receiving coil RX. It is adjusted to be the same as the product of the CRX capacity. Since the corresponding capacitor corresponding to the power transmission coil TX among the capacitors C1 to C4 is connected to the power transmission coil TX, the resonance frequency of the power transmission coil TX can be matched with the resonance frequency f0 of the power reception coil RX. Therefore, the efficiency ⁇ can be improved. In addition, since the power transmission coil TX is selected so that the efficiency ⁇ is good, a decrease in the efficiency ⁇ can be suppressed. Therefore, when the distance d changes, it is possible to suppress a decrease in efficiency ⁇ .
  • the plurality of coils TX1 to TX4 are set such that the coil diameter increases as the distance between the power receiving coil RX and the variable coil device 24 increases.
  • the distance d changes by controlling the switches SW1 to SW4 so that the corresponding capacitor corresponding to the power transmission coil TX among the capacitors C1 to C4 is connected to the power transmission coil TX. A decrease in efficiency ⁇ can be suppressed.
  • the variable coil device 24 includes four coils (coils TX1 to TX4), but may include five or more coils.
  • the capacitance of the capacitor connected via the switch is the product of the impedance of the coil connected to the impedance LRX of the power receiving coil RX of the power receiving device 10 and the capacity of the capacitor CRX connected to the power receiving coil RX. What is necessary is just to adjust so that it may become the product. In this way, the resonance frequency of the power transmission coil TX can be matched with the resonance frequency f0 of the power reception coil RX, and a decrease in efficiency ⁇ can be suppressed.
  • FIG. 6 is a configuration diagram showing an outline of the configuration of the power feeding device 120 including the power transmission coil unit 122 of the second embodiment.
  • FIG. 7 is an explanatory diagram for explaining the configuration of the variable coil device 124.
  • the power feeding device 120 has a point that the number of coils in the variable coil device 124 of the power transmission coil unit 122 is two instead of four, and the number of switches in the variable capacitor device 126 is two instead of four, In the variable capacitor device 126, the number of capacitors is two instead of four.
  • the coils TX1, TX2, and capacitors C1, C2 are connected to power buses L1, L2 via a power amplifier 132 that amplifies power from the voltage source 30.
  • the power supply device 20 has the same configuration as that of the power supply device 20 of the first embodiment except that the power supply device 20 is connected to the power supply device. Accordingly, the same components are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the variable coil device 124 includes coils TX1 and TX2.
  • the radius RTX2 of the coil TX2 is adjusted to be the maximum distance Dmax (coil diameter) that is the maximum value of the range of distances that the coils TX1, TX2 (variable coil device 124) and the power receiving coil RX of the power receiving device 10 can take. ing.
  • the radius RTX1 of the coil TX1 is adjusted to be a half of the radius RTX2 of the coil TX2.
  • One ends of the coils TX1 and TX2 are connected to the power bus L1 of the voltage source 30 via the power amplifier 132.
  • the other ends of the coils TX1 and TX2 are connected to one ends of the switches SW1 and SW2.
  • the coils TX 1 and TX 2, that is, the variable coil device 124 and the power receiving coil RX of the power feeding device 20 are spaced apart with a distance d (hereinafter also referred to as “vertical shift amount z”).
  • the center of the power transmission coil unit 22 and the center of the power reception coil RX are arranged to have a distance x in the horizontal direction (hereinafter also referred to as “horizontal deviation amount x”).
  • the variable capacitor device 126 includes switches SW1 and SW2 and capacitors C1 and C2.
  • Capacitors C1 and C2 have one end connected to power bus L2 of voltage source 30 via power amplifier 132 and the other end connected to switches SW1 and SW2.
  • the variable coil device 124 functions as a device in which the radius r TX , that is, the coil diameter changes in accordance with the on / off of the switches SW1 and SW2.
  • FIG. 8 is a flowchart showing an example of a switch control routine executed by the CPU of the control device 28 of the second embodiment. This routine is repeatedly executed every predetermined time (for example, every several seconds).
  • step S200 the CPU of the control device 28 executes a process of detecting the vertical shift amount z and the horizontal shift amount x between the power transmission coil unit 122 and the power receiving coil RX of the power feeding device 20 (step S200).
  • step S200 a drive signal is transmitted to the imaging device 27 so that an image including at least a part of the coils TX1 and TX2 of the power transmission coil unit 122 and at least a part of the power reception coil RX of the power reception device 10 is captured.
  • the imaging device 27 is controlled. From the image thus obtained, a vertical shift amount z (distance d) and a horizontal shift amount x are detected.
  • the coil TX1 and TX2 having the best power transmission efficiency ⁇ is selected as the power transmission coil TX (step S210).
  • the relationship between the vertical shift amount z (distance d), the horizontal shift amount x, and the power transmission efficiency ⁇ (hereinafter also referred to as “efficiency ⁇ ”) from the coils TX1 and TX2 to the power receiving apparatus 10 will be described.
  • V s is a voltage supplied from the voltage source 30 to the power transmission coil TX.
  • R s is an internal resistance of the voltage source 30.
  • L TX is the inductance of the power transmission coil TX.
  • R TX is a parasitic resistance of the power transmission coil TX.
  • C TX is the capacitance of the capacitor connected to the power transmission coil TX.
  • L RX is the inductance of the receiving coil RX.
  • R RX is a parasitic resistance of the receiving coil RX.
  • C RX is the capacitance of the capacitor CRX connected to the power receiving coil RX.
  • R L is a load resistance of the power receiving coil RX.
  • I TX ” and I RX ” are currents flowing through the power transmission coil TX and the power reception coil RX.
  • K is a coupling coefficient between the power transmission coil TX and the power reception coil RX.
  • M is a mutual inductance between the power transmission coil TX and the power reception coil RX.
  • ⁇ 0 is the resonance angular frequency.
  • J is an imaginary unit.
  • the efficiency ⁇ is defined by the ratio of the power supplied to the load resistance RL of the power receiving coil RX and the power input to the power transmission coil TX. Assuming that the load resistance RL is equal to R RX (1 + k 2 Q TX Q RX ) 1/2 in order to improve the efficiency ⁇ , the efficiency ⁇ can be expressed using the following equation (10). Note that “k 2 Q TX Q Rx ” can be expressed using the following equation (11). Here, “Q TX ” and “Q Rx ” are quality factors of the power transmission coil TX and the power reception coil RX. Thus, by making the value k 2 Q TX Q Rx maximum, the efficiency ⁇ can be made a good value.
  • the average efficiency ⁇ av is defined by the following equation (12). It can be said that the larger the average efficiency ⁇ av, the better the power transmission efficiency from the power feeding device 120 to the power receiving device 10.
  • FIG. 9 is an explanatory diagram showing an example of the relationship between the efficiency ⁇ , the vertical deviation amount z (distance d), and the horizontal deviation amount x when the power transmission coil TX is the coil TX2.
  • FIG. 10 is an explanatory diagram illustrating an example of the relationship between the efficiency ⁇ , the vertical shift amount z (distance d), and the horizontal shift amount x when the power transmission coil TX is the coil TX1.
  • 11 compares the efficiency ⁇ of FIG. 9 and the efficiency ⁇ of FIG. 10 with the same vertical deviation amount z (distance d) and horizontal deviation amount x, and the same vertical deviation amount z (distance d) and horizontal deviation.
  • step S210 when the point corresponding to the vertical shift amount z (distance d) and the horizontal shift amount x detected in step S200 is located on the near side in FIG. 11 from the broken line Ls in FIG.
  • the coil TX2 is set. Select the power transmission coil TX.
  • FIG. 12 is an explanatory diagram showing an example of the relationship between the maximum value of the average efficiency ⁇ av and the number of coils of the variable coil device 124.
  • the number of coils is increased by increasing the number of coils arranged between the coils TX1 and TX2.
  • the variable coil device 124 includes only the coil TX2.
  • the variable coil device 124 includes one coil between the coil TX1 and the coil TX2.
  • the variable coil device 124 includes three coils between the coil TX1 and the coil TX2.
  • the maximum value of the average efficiency ⁇ av increases sharply as compared with one.
  • the maximum value of the average efficiency ⁇ av does not increase so much. Therefore, by setting the number of coils to two, the maximum value of the average efficiency ⁇ av can be sufficiently increased, and the efficiency ⁇ can be sufficiently increased while suppressing an increase in the number of coils. For this reason, the number of coils in the variable coil device 124 is set to two.
  • the number of coils in the variable coil device 124 is set to two.
  • step S220 when the power transmission coil TX is selected, only the switch connected to the selected power transmission coil TX among the switches SW1 and SW2 is turned on (step S220), and this routine is terminated. Thereby, the capacitor
  • the variable coil device 124 includes two coils TX1 and TX2 having different coil diameters arranged so as to be concentric with each other.
  • the coil diameter of the coil TX2 having the larger coil diameter out of TX1 and TX2 is adjusted to be twice the maximum distance Dmax, which is the maximum value in the range of the distance d that the power receiving coil RX and the variable coil device 124 can take.
  • Dmax the maximum distance
  • the coil diameter of the coil TX1 is adjusted to be a half of the coil diameter of the coil TX2, a decrease in efficiency ⁇ can be suppressed with a simpler configuration.
  • variable coil devices 24 and 124 include a plurality of coils (such as the coil TX1), and by switching a switch (such as the switch SW1) of the variable capacitor device 26,
  • the radius (coil diameter) of the variable coil devices 24 and 124 is variable.
  • one bar-shaped copper wire LT3 is disposed so as to pass over the two arc-shaped copper wires LT1 and LT2, and the copper wires LT1 and LT2 are
  • the rod-shaped copper wire LT3 is rolled, and the coil diameter (distance d1 between the connection point Pcr of the copper wire LT1 and the variable capacitor CR and the copper wire LT3) is variable by the copper wires LT1, LT3, LT2. May be formed.
  • the thick arrow indicates the rolling direction of the copper wire LT3.
  • a black circle shows an example of a contact between the copper wire LT1 and the copper wire LT3 and a contact between the copper wire LT2 and the copper wire LT3.
  • the rod-shaped copper wire LT5 is slid along the spiral of the spiral copper wire LT4, and the coil diameter ( A coil having a variable distance d2) between the tip T on the inner diameter side of the spiral and the contact Pc between the copper wire LT4 and the copper wire LT5 may be formed.
  • the thick arrow indicates the moving direction of the copper wire LT5.
  • a black circle on the copper wire LT5 indicates an example of the contact Pc.
  • the variable capacitor devices 226 and 326 may be connected to the variable coil devices 224 and 324 and may be variable capacitors CR having a variable capacity.
  • the capacitance of the variable capacitor CR is equal to the product of the impedance of the variable coil devices 224 and 324 and the impedance LRX of the power receiving coil RX of the power receiving device 10 and the capacitor CRX connected to the power receiving coil RX. It may be adjusted as follows.
  • the coils TX1 to TX4 are circular.
  • the coils TX1 to TX4 are not limited to circular coils, and may be rectangular.
  • the “coil diameter” may be an average value of the length of the long side and the length of the short side of the rectangle.
  • the coil diameters of the variable coil devices 24 and 124 increase as the distance between the power receiving coil RX and the variable coil devices 24 and 124 increases.
  • the power transmission coil TX is selected from a plurality of coils (such as the coil TX1) so as to increase.
  • the coil diameter of the variable coil devices 24 and 124 tends to increase as the distance between the power receiving coil RX and the variable coil devices 24 and 124 increases. Therefore, as the distance between the power receiving coil RX and the variable coil devices 24 and 124 increases, the coil diameter of the variable coil devices 24 and 124 is not always increased. For example, the coil diameter is stepped with respect to the distance d. You can change.
  • the distance between the power receiving coil RX and the variable coil devices 24 and 124 using the image signal Pic from the imaging device 27. d is detected, but the mutual impedance between the receiving coil RX and the variable coil devices 24 and 124 is measured using the image signal Pic from the imaging device 27, and the distance is measured using the measured value of the mutual impedance. d may be detected.
  • the power transmission coil TX is selected using the distance d, the vertical shift amount z, and the horizontal shift amount x detected by the imaging device 27. doing. However, if changes in the distance d, the vertical shift amount z, and the horizontal shift amount x between the power reception coil RX and the power transmission coil unit 22 are determined in advance, the imaging device 27 may not be provided. In this case, the current distance d, vertical shift amount z, and horizontal shift amount x are set based on changes in the predetermined distance d, vertical shift amount z, and horizontal shift amount x, and the set distance d and vertical shift amount are set. What is necessary is just to select the power transmission coil TX using z and the horizontal deviation
  • variable coil device 24 corresponds to a “variable coil device”
  • variable capacitor device 26 corresponds to a “variable capacitor device”
  • control device 28 corresponds to a “control device”.
  • the present invention is applicable to the power transmission coil unit manufacturing industry.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

L'invention concerne une unité bobine de transmission d'énergie étant utilisée dans un dispositif d'alimentation électrique pour alimenter en énergie, sans contact, un dispositif de réception d'énergie ayant une bobine de réception d'énergie et comprenant : un dispositif à bobine variable ayant un diamètre de bobine variable ; un dispositif à condensateur variable connecté au dispositif à bobine variable et ayant une capacité variable ; et un dispositif de commande pour commander le dispositif à bobine variable avec une tendance telle que le diamètre de bobine augmente à mesure que la distance entre la bobine de réception d'énergie et le dispositif à bobine variable augmente et pour commander le dispositif à condensateur variable de sorte que la capacité corresponde au diamètre de bobine du dispositif à bobine variable.
PCT/JP2019/019664 2018-05-18 2019-05-17 Unité bobine de transmission d'énergie WO2019221270A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201862673166P 2018-05-18 2018-05-18
US62/673,166 2018-05-18

Publications (1)

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WO2019221270A1 true WO2019221270A1 (fr) 2019-11-21

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WO (1) WO2019221270A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252497A (ja) * 2009-04-14 2010-11-04 Fujitsu Ten Ltd 無線電力伝送装置および無線電力伝送方法
JP2012105478A (ja) * 2010-11-11 2012-05-31 Sony Corp 伝送装置、電子機器、及び、伝送方法
JP2014157767A (ja) * 2013-02-18 2014-08-28 Mitsubishi Chemicals Corp 照明システム
WO2015121977A1 (fr) * 2014-02-14 2015-08-20 日産自動車株式会社 Appareil d'alimentation électrique sans contact

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010252497A (ja) * 2009-04-14 2010-11-04 Fujitsu Ten Ltd 無線電力伝送装置および無線電力伝送方法
JP2012105478A (ja) * 2010-11-11 2012-05-31 Sony Corp 伝送装置、電子機器、及び、伝送方法
JP2014157767A (ja) * 2013-02-18 2014-08-28 Mitsubishi Chemicals Corp 照明システム
WO2015121977A1 (fr) * 2014-02-14 2015-08-20 日産自動車株式会社 Appareil d'alimentation électrique sans contact

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