JP6216966B2 - Power transmission system - Google Patents

Description

  The present invention relates to a power transmission system that transmits and receives power wirelessly by a magnetic resonance method.

  In recent years, development of technology for transmitting electric power (electric energy) wirelessly without using a power cord or the like has become active. Among wireless transmission methods, there is a technique called magnetic resonance as a technology that has attracted particular attention. This magnetic resonance method was proposed by a research group of Massachusetts Institute of Technology in 2007, and a technology related to this is disclosed in, for example, Japanese Patent Application Laid-Open No. 2009-501510.

  A magnetic resonance wireless power transmission system efficiently transmits energy from a power transmission side antenna to a power reception side antenna by making the resonance frequency of the power transmission side antenna and the resonance frequency of the power reception side antenna the same. One of the major features is that the power transmission distance can be several tens of centimeters to several meters.

  When such a magnetic resonance wireless power transmission system is used in a power supply station of a vehicle such as an electric vehicle, a power receiving antenna is mounted on the bottom of the vehicle, and the power receiving antenna is connected to the power receiving antenna. A method of feeding power from a power transmission antenna provided on the ground can be considered.

For example, in Patent Document 2 (Japanese Patent Laid-Open No. 2010-68657), one antenna is mounted on the bottom of a moving body such as an electric vehicle, and power is transmitted wirelessly from the other antenna provided on the ground. It is disclosed that the transmitted electric power is charged in a battery of an electric vehicle.
Special table 2009-501510 JP 2010-68657 A

  In configuring the power transmission system for a vehicle as described above, the inventors use a primary resonator including a primary resonator coil as a power transmission antenna and a secondary including a secondary resonator coil as a power receiving antenna. While using a resonator, the inductance of the primary resonator coil is set to be larger than the inductance of the secondary resonator coil in order to improve power transmission efficiency. Since the primary side and the secondary side have the above-described inductance relationship, the shape of the primary resonator coil is larger than that of the secondary resonator coil.

  FIG. 13 is a diagram for explaining a conventional primary resonator coil and secondary resonator coil. The primary resonator coil constituting the primary resonator is housed in the primary resonator case and arranged on the ground. The secondary resonator coil constituting the secondary resonator is housed in the secondary resonator case and attached to the bottom surface of the vehicle.

  The primary resonator coil and the secondary resonator coil as described above are opposed to each other to execute power transmission. FIG. 14 illustrates the opposed pattern of the primary resonator coil and the secondary resonator coil at that time. FIG. FIG. 14 is a plan view of another configuration such as a vehicle made transparent, and the primary resonator coil and the secondary resonator coil viewed from vertically above.

  FIG. 14A shows a case where the primary resonator coil and the secondary resonator coil face each other in a state where maximum power transmission can be performed, and FIG. 14B shows the primary resonator. The case where the coil and the secondary resonator coil are shifted from the state of FIG.

  Conventionally, it has been possible to transmit power even when the opposing state of both coils as shown in FIG. 14 (B) is slightly deviated from the ideal state, but the primary resonator coil and the secondary resonator There has been a problem that the coupling coefficient between the coils is greatly reduced, which causes a significant reduction in power transmission efficiency.

In order to solve the above problem, a power transmission system according to the present invention includes a primary resonator including a primary resonator coil installed on the ground and wound with a conductor wire, and disposed opposite to the primary resonator. A secondary resonator coil around which a conductor wire is wound, and a secondary resonator that receives electric energy from the primary resonator via an electromagnetic field. have a widened portion broadening in the circumferential side, wherein the primary resonator coil has an outer periphery of the substantially rectangular, when the width of the gap between the innermost and outermost of the primary resonator coil The widened portion has a first width, the portion other than the widened portion has a second width that is narrower than the first width, and the widened portion is provided on a part of the long side of the substantially rectangular shape. The winding density in the widened portion is sparser than the winding density in a portion other than the widened portion .

In addition, the power transmission system according to the present invention has a base material including a base portion that forms a flat plate portion, and a projecting piece that extends radially from the base portion and maintains the shape of the primary resonator coil. and is, in the widened portion, with a surface of the conductor wire to each one of said shaped projection piece is locked is changed, the portion other than the wider section, wherein a continuous two said shaped projecting piece The surface on which the conductor wire is locked is changed.

Further, the power transmission system according to the present invention is characterized in that when the primary resonator coil is circulated, portions having different winding densities are mixed.

In the power transmission system according to the present invention, the primary resonator coil has a substantially rectangular outer periphery,
Since it has a widened portion that widens on the inner peripheral side of the primary resonator coil,
According to the power transmission system of the present invention,
Even if the opposing state of the primary resonator coil and the secondary resonator coil is slightly deviated from the ideal state, the coupling coefficient between the primary resonator coil and the secondary resonator coil is greatly reduced. In other words, it is possible to prevent a significant decrease in power transmission efficiency due to a shift between both coils.

1 is a block diagram of a power transmission system according to an embodiment of the present invention. It is a figure which shows the inverter part of an electric power transmission system. It is a figure which shows the equivalent circuit of the electric power transmission system 100 which concerns on embodiment of this invention. It is a figure explaining the installation form of the primary resonator and the secondary resonator in the electric power transmission system which concerns on embodiment of this invention. It is a figure explaining the primary resonator coil and the secondary resonator coil in the electric power transmission system which concern on embodiment of this invention. It is a figure explaining the structural example of a primary resonator coil and a secondary resonator coil. It is a figure which shows the base material utilized in order to model a primary resonator coil. It is a figure explaining the winding pattern of the conductor wire of a primary resonator coil. It is a figure explaining the difference in the winding density by the difference in a winding pattern. It is a figure which shows typically the primary resonator coil 160 in the electric power transmission system which concerns on embodiment of this invention. It is a figure explaining the example of a layout of the primary resonator coil arrange | positioned on the ground, and a vehicle-mounted secondary resonator coil. It is a figure explaining the opposing pattern of a primary resonator coil and a secondary resonator coil. It is a figure explaining the conventional primary resonator coil and secondary resonator coil. It is a figure explaining the opposing pattern of the primary resonator coil at the time of electric power transmission, and a secondary resonator coil.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a power transmission system according to an embodiment of the present invention. In the present embodiment, an example will be described in which the primary resonator 150 is used as a power transmission-side antenna and a secondary resonator 250 is used as a power-receiving antenna.

  As a power transmission system using the antenna of the present invention, for example, a system for charging a vehicle such as an electric vehicle (EV) or a hybrid electric vehicle (HEV) is assumed. Since the electric power transmission system transmits electric power to the vehicle as described above in a non-contact manner, the electric power transmission system is provided in a stop space where the vehicle can be stopped. The user of the vehicle stops the vehicle in a stop space where the power transmission system is provided, and makes the secondary resonator 250 mounted on the vehicle and the primary resonator 150 face each other, thereby causing the power transmission system. Receives power from.

  In the power transmission system, when power is efficiently transmitted from the primary resonator 150 on the power transmission system 100 side to the secondary resonator 250 on the power receiving system 200 side, the resonance frequency of the primary resonator 150, 2 By making the resonance frequency of the next resonator 250 the same, energy is efficiently transferred from the power transmission side antenna to the power reception side antenna.

  The AC / DC conversion unit 101 in the power transmission system 100 is a converter that converts an input commercial power source into a constant direct current. The output from the AC / DC converter 101 is boosted to a predetermined voltage by the voltage controller 102. Setting of the voltage generated by the voltage control unit 102 can be controlled from the main control unit 110.

The inverter unit 103 generates a predetermined AC voltage from the voltage supplied from the voltage control unit 102 and inputs it to the matching unit 104. FIG. 2 is a diagram illustrating an inverter unit of the power transmission system. For example, as shown in FIG. 2, the inverter unit 103 includes four field effect transistors (FETs) composed of Q _{A to} Q _D connected in a full bridge system.

In the present embodiment, between the connection portion T1 between the switching elements Q _A and Q _B connected in series and the connection portion T2 between the switching elements Q _C and Q _D connected in series. The matching device 104 is connected to the switching element Q _A.
When the switching element Q _D is on, the switching element Q _B and the switching element Q _C are off. When the switching element Q _B and the switching element Q _C are on, the switching element Q _A and the switching element Q _D are off. As a result, a rectangular wave AC voltage is generated between the connection portion T1 and the connection portion T2. In the present embodiment, the range of the frequency of the rectangular wave generated by the switching of each switching element is about 20 kHz to several 1000 kHz.

Drive signals for the switching elements Q _{A to} Q _D constituting the inverter unit 103 as described above are input from the main control unit 110. The frequency for driving the inverter unit 103 can be controlled from the main control unit 110.

  The matching unit 104 is composed of a passive element having a predetermined circuit constant, and receives an output from the inverter unit 103. The output from the matching unit 104 is supplied to the primary resonator 150. The circuit constants of the passive elements constituting the matching unit 104 can be adjusted based on a command from the main control unit 110. The main control unit 110 instructs the matching unit 104 so that the primary resonator 150 and the secondary resonator 250 resonate. The matching unit 104 is not an essential configuration.

  The primary resonator 150 includes a primary resonator coil 160 having an inductive reactance component and a primary resonator capacitor 170 having a capacitive reactance component, and is mounted on the vehicle so as to face each other. By resonating with the secondary resonator 250, the electrical energy output from the primary resonator 150 can be sent to the secondary resonator 250. The primary resonator 150 and the secondary resonator 250 function as a magnetic resonance antenna unit in the power transmission system 100.

  The main control unit 110 of the power transmission system 100 is a general-purpose information processing unit that includes a CPU, a ROM that holds a program that runs on the CPU, and a RAM that is a work area of the CPU. The main control unit 110 operates in cooperation with the components connected to the main control unit 110 shown in the figure.

  The communication unit 120 is configured to perform wireless communication with the vehicle-side communication unit 220 so that data can be transmitted to and received from the vehicle. Data received by the communication unit 120 is transferred to the main control unit 110, and the main control unit 110 can transmit predetermined information to the vehicle side via the communication unit 120.

  Next, a configuration provided on the vehicle side will be described. In the system on the power receiving side of the vehicle, the secondary resonator 250 receives electric energy output from the primary resonator 150 by resonating with the primary resonator 150. Such a secondary resonator 250 is attached to the bottom surface of the vehicle.

  The secondary resonator 250 includes a secondary resonator coil 260 having an inductive reactance component and a secondary resonator capacitor 270 having a capacitive reactance component.

  The AC power received by the secondary resonator 250 is rectified by the rectification unit 202, and the rectified power is stored in the battery 204 through the charge control unit 203. The charging control unit 203 controls the storage of the battery 204 based on a command from the main control unit 210. More specifically, the output from the rectifying unit 202 is stepped up or down to a predetermined voltage value in the charge control unit 203 and stored in the battery 204. In addition, the charging control unit 203 is configured to be able to perform remaining amount management of the battery 204 and the like.

The main control unit 210 is a general-purpose information processing unit that includes a CPU, a ROM that holds programs that run on the CPU, and a RAM that is a work area of the CPU. The main controller 210 operates in cooperation with the components connected to the main controller 210 shown in the figure.

  The interface unit 215 is provided in the driver's seat of the vehicle and provides predetermined information to the user (driver) or accepts an operation / input from the user. A touch panel, a speaker, and the like. When a predetermined operation by the user is executed, the interface unit 215 sends the operation data to the main control unit 210 for processing. Further, when providing predetermined information to the user, display instruction data for displaying the predetermined information is transmitted from the main control unit 210 to the interface unit 215.

  Further, the vehicle-side communication unit 220 is configured to perform wireless communication with the power transmission-side communication unit 120 and to transmit and receive data to and from the power transmission-side system. Data received by the communication unit 220 is transferred to the main control unit 210, and the main control unit 210 can transmit predetermined information to the power transmission system side via the communication unit 220.

  In the power transmission system, a user who wants to receive power inputs the information indicating that charging is performed from the interface unit 215 by stopping the vehicle in the stop space where the power transmission side system as described above is provided. Receiving this, the main control unit 210 obtains the remaining amount of the battery 204 from the charge control unit 203 and calculates the amount of power necessary for charging the battery 204. The calculated amount of power and information to request power transmission are transmitted from the vehicle side communication unit 220 to the communication unit 120 of the power transmission side system. The main control unit 110 of the power transmission side system that has received the information controls the voltage control unit 102, the inverter unit 103, and the matching unit 104 to transmit power to the vehicle side.

  Next, circuit constants (inductance component and capacitance component) of the primary resonator 150 and the secondary resonator 250 configured as described above will be described. FIG. 3 is a diagram showing an equivalent circuit of the power transmission system 100 according to the embodiment of the present invention.

  In the power transmission system 100 according to the present invention, the circuit constants (inductance component, capacitance component) of the primary resonator 150 and the circuit constants of the secondary resonator 250 are intentionally different from each other, so that the transmission efficiency can be improved. To improve.

In the equivalent circuit shown in FIG. 3, the inductance component of the primary resonator 150 is L ₁ , the capacitance component is C ₁ , the resistance component is Rt ₁ , the inductance component of the secondary resonator 250 is L ₂ , and the capacitance component is C ₂ , the resistance component is Rt ₂ , and the mutual inductance between the primary resonator 150 and the secondary resonator 250 is M. The resistance component Rt ₁ and the resistance component Rt ₂ are internal resistances such as conductive wires, and are not intentionally provided. R represents the internal resistance of the battery 204. The coupling coefficient between the primary resonator 150 and the secondary resonator 250 is indicated by K.

In the present embodiment, the primary resonator 150 is a series resonator having an inductance component L ₁ and a capacitance component C ₁ , and the secondary resonator 250 is an inductance component L ₂ and a capacitance component C ₂ . Consider a series resonator.

First, in the magnetic resonance type power transmission, when power is efficiently transmitted from the primary resonator 150 on the power transmission system 100 side to the secondary resonator 250 on the power receiving side system 200 side, By making the resonance frequency and the resonance frequency of the secondary resonator 250 the same, energy is efficiently transferred from the power transmission side antenna (primary resonator 150) to the power reception side antenna (secondary resonator 250). Like to do. The condition for this can be expressed by the following formula (1).

これを、インダクタンス成分がＬ₁、キャパシタンス成分がＣ₁、インダクタンス成分がＬ₂、キャパシタンス成分がＣ₂のみの関係で示すと、下式（２）に要約することができる。

This can be summarized by the following equation (2) when the inductance component is L ₁ , the capacitance component is C ₁ , the inductance component is L ₂ , and the capacitance component is C ₂ only.

また、１次共振器１５０のインピーダンスは下式（３）により、また、２次共振器２５０のインピーダンスは下式（４）により、表すことができる。なお、本明細書においては、下式（３）及び下式（４）によって定義される値をそれぞれの共振器のインピーダンスとして定義する。

Further, the impedance of the primary resonator 150 can be expressed by the following equation (3), and the impedance of the secondary resonator 250 can be expressed by the following equation (4). In the present specification, values defined by the following expressions (3) and (4) are defined as impedances of the respective resonators.

磁気共鳴方式の電力伝送システム１００の受電側システムにおいて、電池２０４が定電圧充電モードに移行すると、電池２０４の電圧が一定なので、充電電力によって入力インピーダンスが変化する。電池２０４への充電電力が大きければ入力インピーダンスは低く、充電電力が小さければ入力インピーダンスは高くなる。受電側における２次共振器２５０は、効率の面から、電池２０４の充電電力に応じた入力インピーダンスに近いインピーダンスに設定することが望ましい。

In the power receiving side system of the magnetic resonance type power transmission system 100, when the battery 204 shifts to the constant voltage charging mode, the voltage of the battery 204 is constant, so the input impedance changes depending on the charging power. If the charging power to the battery 204 is large, the input impedance is low, and if the charging power is small, the input impedance is high. The secondary resonator 250 on the power receiving side is desirably set to an impedance close to the input impedance corresponding to the charging power of the battery 204 in terms of efficiency.

  On the other hand, the input impedance to the primary resonator 150 viewed from the power source on the power transmission side is better as it is higher in terms of efficiency. This is because a loss occurs in proportion to the square of the current due to the internal resistance of the power supply.

  From the above, the relationship of the following equation (5) is satisfied between the impedance of the primary resonator 150 expressed by the equation (3) and the impedance of the secondary resonator 250 expressed by the equation (4). It is desirable that

これを、インダクタンス成分がＬ₁、キャパシタンス成分がＣ₁、インダクタンス成分がＬ₂、キャパシタンス成分がＣ₂のみの関係で示すと、下式（６）に要約することができる。

This can be summarized by the following equation (6) when the inductance component is L ₁ , the capacitance component is C ₁ , the inductance component is L ₂ , and the capacitance component is C ₂ only.

本発明に係る電力伝送システム１００においては、１次共振器１５０の回路定数と、２次共振器２５０の回路定数とが上記の式（２）及び式（６）を満たすようにされているために、受電側システムで電池２０４の充電を行う場合に、効率的な電力伝送を行うことが可能となる。

In the power transmission system 100 according to the present invention, the circuit constant of the primary resonator 150 and the circuit constant of the secondary resonator 250 satisfy the above formulas (2) and (6). In addition, when the battery 204 is charged by the power receiving side system, efficient power transmission can be performed.

  Further, the relationship with the internal impedance of the battery 204 will also be mentioned. In the power receiving side system, as a condition for efficiently charging the battery 204, the impedance of the secondary resonator 250 and the impedance of the battery 204 can be matched.

  That is, in the present embodiment, in addition to the conditions of the expressions (2) and (6), the impedance between the secondary resonator 250 of the expression (4) and the impedance R of the battery 204 is

の関係を持たせることで、受電側システムで電池２０４の充電を行う場合、システム全体として、効率的な電力伝送を行うことを可能としている。

Thus, when the battery 204 is charged in the power receiving side system, efficient power transmission can be performed as the entire system.

  Next, the primary resonator coil 160 in the power transmission system 100 configured as described above will be described in more detail.

  As described so far, the power transmission system 100 according to the present embodiment is used to charge a vehicle-mounted battery such as an electric vehicle (EV) or a hybrid electric vehicle (HEV). FIG. 4 is a diagram illustrating an installation form of the primary resonator 150 and the secondary resonator 250 in the power transmission system according to the embodiment of the present invention.

  As shown in FIG. 4, the primary resonator coil 160 and the primary resonator capacitor 170 constituting the primary resonator 150 are housed in the primary resonator case 140 and are disposed on the ground. On the other hand, the secondary resonator coil 260 and the secondary resonator capacitor 270 constituting the secondary resonator 250 are housed in the secondary resonator case 240 and attached to the bottom surface of the vehicle.

  FIG. 5 is a diagram for explaining the primary resonator coil 160 and the secondary resonator coil 260 in the power transmission system according to the embodiment of the present invention.

  FIG. 5 is a diagram illustrating a primary resonator case 140 in which the primary resonator 150 is accommodated and a secondary resonator case 240 in which the secondary resonator 250 is accommodated. In this figure, only the primary resonator coil 160 of the primary resonator 150 is shown, and the primary resonator capacitor 170 is not shown. Similarly, only the secondary resonator coil 260 of the secondary resonator 250 is shown, and the secondary resonator capacitor 270 is not shown.

  Further, FIG. 6 is a diagram showing the primary resonator coil 160 and the secondary resonator coil 260 extracted from the primary resonator case 140 and the secondary resonator case 240, respectively.

  The primary resonator coil 160 and the secondary resonator coil 260 are configured by winding a conductor wire around a base material. The wound conductor wire as a whole becomes a coil having an exclusive area such as a hatched portion.

  FIG. 7 is a view showing a base material 300 used for modeling the primary resonator coil 160.

  The base material 300 is a substrate-like member having a first surface 301 and a second surface 302 that has a front and back relationship with the first surface 301. For example, the base material 300 can be configured using a material having a small dielectric loss tangent, such as polycarbonate or polypropylene. preferable.

  The base 300 includes a base 310 that forms a substantially rectangular flat plate portion, and a plurality of first type coil shaping protrusions 321 and second type coil shaping protrusions 322 that extend radially from the base 310. It is configured.

  Here, the first type coil shaping projecting piece 321 is configured to extend from a cut portion 315 provided on the long side of the base portion 310. Since the cut portion 315 as described above is provided, the first type coil shaping projection piece 321 is longer than the second type coil shaping projection piece 322 from the substantially rectangular base 310 in the length d inward side. It is designed to extend. In the present embodiment, a widened portion 340, which will be described later, is formed by the second type coil shaping protrusion 322.

  In the first type coil shaping protrusion 321 and the second type coil shaping protrusion 322, the conductor wire 400 is passed through one side of the first surface 301 or the second surface 302, and the conductor wire 400 is locked. Used for. Thereby, the shape of the primary resonator coil 160 is maintained by the conductor wire 400.

  However, in the first type coil shaping projection piece 321, the surface on which the conductor wire 400 is locked is changed for each one type 1 coil shaping projection piece 321, whereas the second type coil shaping projection piece 321. In 322, basically, the surface on which the conductor wire 400 is locked by two continuous second type coil shaping protrusions 322 is changed.

  Next, an example of the winding pattern of the conductor wire 400 when modeling with the base material 300 as described above will be described with reference to FIG. FIG. 8 is a diagram for explaining a winding pattern of the conductor wire 400 of the primary resonator coil 160. In addition, as the conductor wire 400, it is preferable to use the strand wire which assembled the some conductor strand.

In FIG. 8, the arrows indicate the order in which the coil is wound. In FIG. 8, for example, the conductor wire 400 starts to be wound from X, and the conductor wire 40 is applied to each coil shaping protrusion 322 counterclockwise.
A case where the primary resonator coil 160 is wound while 0 is locked will be described.

  Assuming that the conductor wire 400 starts to be wound by starting the winding from X and locking the conductor wire 400 to the second type coil shaping protrusion 322 shown in FIG. The conductor wire 400 is locked on the first surface 301 side of the second type coil shaping projection piece 322 over the two second type coil shaping projection pieces 322.

  Subsequently, the conductor wire 400 is locked on the second surface 302 side of the second type coil shaping projection piece 322 over the two second type coil shaping projection pieces 322 shown in FIG.

  On the other hand, the conductor wire 400 is locked on the first surface 301 side of the second type coil shaping projecting piece 322 over the two second type coil shaping projecting pieces 322 shown in FIG.

  Subsequently, the conductor wire 400 is locked on the second surface 302 side of the second type coil shaping projecting piece 322 over the two second type coil shaping projecting pieces 322 shown in FIG.

  Next, in (e), the conductor wire 400 is locked on the first surface 301 side of the second type coil shaping projection piece 322 with respect to only one second type coil shaping projection piece 322.

  As the coil is wound, two continuous second type coil forming protrusions 322 are used for the second type coil forming protrusion 322 immediately before proceeding to the first type coil forming protrusion 321. Rather than locking the conductor wire 400, the conductor wire 400 is locked only by one second-type coil shaping protrusion 322.

  Subsequently, in (f), the conductor wire 400 is locked to one second-type coil shaping protrusion 321 on the second surface 302 side of the first-type coil shaping protrusion 321.

  Subsequently, in (g), the conductor wire 400 is locked on the first surface 301 side of the first type coil shaping projecting piece 321 with respect to one first type coil shaping projection piece 321.

  Next, again, the conductor wire 400 is locked to the second type coil shaping protrusion 322, so the surface for locking the conductor wire 400 is changed for each of the two second type coil shaping protrusions 322. . That is, the conductor wire 400 is latched on the second surface 302 side of the second type coil shaping protrusion 322 shown in FIG.

  The primary resonator coil 160 is configured by winding the conductor wire 400 around the first type coil shaping protrusion 321 and the second type coil shaping protrusion 322 in the same pattern.

  Next, the merit of winding the conductor wire 400 around the base material 300 with the winding pattern as described above will be described.

  FIG. 9 is a diagram for explaining a difference in winding density due to a difference in winding pattern. In the figure, the hatched rectangular portion is a side view of the coil shaping protrusion. Further, the upper side of the coil shaping protrusion is the first surface side, and the lower side is the second surface side. Further, in the figure, the portion surrounded by a dotted line indicates the intersection of the conductor line where the conductor wire 400 wound on the nth turn intersects with the conductor line 400 wound on the (n + 1) th turn. .

  FIG. 9A shows a case where the surface on which the conductor wire 400 is locked changes for each one of the coil shaping protrusions. In this case, it can be seen that the intersection is between all the coil shaping protrusions.

  FIG. 9B shows a case where the surface on which the conductor wire 400 is locked is changed for every two continuous coil shaping projection pieces. In this case, it can be seen that the intersection is between every other coil shaping protrusion.

  From the above, when the winding pattern shown in FIG. 9B is adopted, the winding density becomes dense compared to the case where the winding pattern shown in FIG. 9A is adopted.

  In the present specification, the winding pattern is defined as a coil having a higher winding density as the winding pattern in which the conductor wire 400 becomes denser in the same space. The “winding density” is proportional to the number of windings per unit area.

  FIG. 10 is a diagram schematically showing the primary resonator coil 160 according to the present embodiment wound by the winding pattern described in FIG.

In the primary resonator coil 160 according to this embodiment, the notch 315 of the base material 300 is provided, and the first type coil shaping protrusion 321 extends as shown in FIG. 9A as described above. Since the winding pattern is adopted, even if the conductor wire 400 is wound the same number of times, more space is required than the winding pattern of FIG. 9B, and the inner periphery side of the primary resonator coil 160 A widened portion 340 having a wider width is formed. That is, the widened portion 340 in the primary resonator coil 160 has the first width W ₁ , and the portions other than the widened portion 340 have the second width W ₂ narrower than the first width W _1. .

  Further, the primary resonator coil 160 according to the present embodiment is characterized in that the winding density in the widened portion 340 is sparser than the winding density in a portion other than the widened portion 340. Therefore, in the present embodiment, as shown in FIG. 10, when the primary resonator coil 160 is circulated, there are alternately portions where the winding density is dense and portions where the winding density is sparse. In the next resonator coil 160, a portion where the winding density is dense and a portion where the winding density is sparse are mixed.

  Next, the merit of using the primary resonator coil 160 as described above in the power transmission system 100 will be described.

  FIG. 11 is a diagram for explaining a layout example of the primary resonator coil 160 and the in-vehicle secondary resonator coil 260 arranged on the ground. FIG. 11 shows that the vehicle is stopped in a stop space where the primary resonator 150 is installed, and the secondary resonator 250 mounted on the vehicle and the primary resonator 150 are opposed to each other so that the electric power is transmitted in the power transmission system 100. It is a figure which shows the layout of each coil at the time of performing transmission, and has shown what looked at other structures, such as a vehicle, transparently from the perpendicular | vertical upper direction.

  FIG. 12 is a diagram for explaining the opposing patterns of the primary resonator coil 160 and the secondary resonator coil 260.

  FIG. 11 and FIG. 12A show a case where the primary resonator coil and the secondary resonator coil face each other in an ideal state with the highest transmission efficiency. On the other hand, FIG. 12B shows a case where the primary resonator coil 160 and the secondary resonator coil 260 are opposed to each other with a deviation from the state of FIG.

In the power transmission system 100 according to the present invention, the widened portion 340 is provided in the primary resonator coil 160 even when the opposing state of both coils as shown in FIG. 12B is slightly deviated from the ideal state. Therefore, the area where the primary resonator coil 160 and the secondary resonator coil 260 overlap with each other when viewed from the vertical direction is larger than that of the conventional example, and the primary resonator coil 160 and the secondary resonator coil 260 overlap. The coupling coefficient between the resonator coils 260 is not significantly reduced. For this reason, even if the opposing pattern of both coils as shown in FIG. 12 (B), the power transmission efficiency is not significantly reduced.

DESCRIPTION OF SYMBOLS 100 ... Power transmission system 101 ... AC / DC conversion part 102 ... Voltage control part 103 ... Inverter part 104 ... Matching device 110 ... Main control part 120 ... Communication part 140- Primary resonator case 150 ... Primary resonator 160 ... Primary resonator coil 170 ... Primary resonator capacitor 201 ... Secondary resonator 202 ... Rectifier 203 ... Charging control unit 204 ... battery 210 ... main control unit 215 ... interface unit 220 ... communication unit 240 ... secondary resonator case 250 ... secondary resonator 260 ... 2 Secondary resonator coil 270 ... secondary resonator capacitor 300 ... base material 301 ... first surface 302 ... second surface 310 ... base 315 ... notch 321 ... first Projection piece 322 for seed coil shaping ... second Coil shaped projecting piece 340 ... wide portions 400 ... conductor wire

Claims (3)

A primary resonator including a primary resonator coil installed on the ground and wound with a conductor wire;
A secondary resonator disposed opposite to the primary resonator and including a secondary resonator coil around which a conductor wire is wound, and receiving electrical energy from the primary resonator via an electromagnetic field,
Have a widened portion broadening the inner peripheral side of the primary resonator coil,
The primary resonator coil has a substantially rectangular outer periphery;
When the interval between the innermost circumference and the outermost circumference of the primary resonator coil is a width, the widened portion has a first width, and the portions other than the widened portion are narrower than the first width. Having a width of 2;
The widened portion is provided on a part of the long side of the substantially rectangular shape,
The power transmission system , wherein a winding density in the widened portion is sparser than a winding density in a portion other than the widened portion . A base portion comprising a flat plate portion, and a base member formed of a projecting piece that extends radially from the base portion and maintains the shape of the primary resonator coil;
In the wider section, together with the surface on which the conductor line for each one of said shaped projection piece is locked is changed,
Wherein in the portion other than the widened portion, the power transmission system according to claim 1, characterized in that the surface of the conductor wire is anchored at two consecutive said shaping protrusion varies. The power transmission system according to claim 2 , wherein when the primary resonator coil is circulated, parts having different winding densities are mixed.

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