JP5801240B2 - Resonant type wireless power transmission device - Google Patents

Description

  The present invention relates to a resonance type wireless power transmission apparatus that feeds power from a power transmission side device outside a manhole to a power reception side device in a manhole by an electromagnetic induction method and communicates between the power transmission side device and the power reception side device by an electromagnetic induction method. About.

  A power feeding method that does not require a wired connection is used for charging a secondary battery such as a mobile phone or supplying power to a non-contact IC card, an RFID tag, or the like. This is based on the electromagnetic induction method, and coils are arranged on the power transmission side and the power reception side, and the power is transmitted to the power reception side when they are close to each other and the magnetic flux of the power transmission side coil passes through the power reception side coil ( Non-patent document 1). In general, in order to obtain a sufficient transmission efficiency, the electromagnetic induction method is a method in which the transmitting and receiving coils are close to each other to reduce the leakage magnetic flux. Furthermore, in recent years, a resonance-type wireless power transmission apparatus has been proposed that can obtain high power supply efficiency even when a certain transmission distance (for example, 2 to 3 m) is provided (Non-Patent Document 2).

FIG. 9 shows a configuration example of a resonance type wireless power transmission apparatus.
In FIG. 9, a power transmission side coil 13 connected to the power source 11 of the power transmission side device 10 and a power reception side coil 22 connected to the load 23 of the power reception side device 20 are respectively connected to the power transmission side resonance coil 14 and the power reception side resonance coil 21. The electric power is transmitted from the power source 11 to the load 23 by being electrically coupled by electromagnetic induction through a resonance phenomenon. Resonance occurs only at specific frequencies. An example of the S parameter (S21) of the resonance coil is shown in FIG. From the figure, it can be seen that the frequency at which the peak is obtained is limited, and that the peak frequency varies depending on the load. Further, the peak frequency varies depending on the interval between the power transmission side device 10 and the power reception side device 20.

  By the way, if the sensor information collected in the manhole can be collected by transmitting the sensor information etc. using the power supplied by the above-mentioned resonance type wireless power transmission device without opening the lid of the entrance / exit of the manhole, Maintenance work is greatly simplified.

Hiroshi Isobe, “Introduction to contactless IC card design”, Nikkan Kogyo Shimbun. Aristeidis Karalis, J.D.Joannopoulos and Marin Soljacic, 'Efficient wireless non-radiative mid-range energy transfer,' Annals of Physics, Vol.323 Issue 1, pp.34-48, Apr 2007.

  When power supply or communication is performed inside or outside the manhole by electromagnetic induction, it is necessary to stably supply sufficient power for the operation of electronic devices in the manhole and to secure a sufficient reception level to demodulate the transmission signal. Become.

  However, the manhole has a thick lid made of cast iron, and the magnetic field lines are absorbed by this lid, so that it is difficult to obtain sufficient power supply and signal power. In other words, even if it is attempted to supply power from the manhole by electromagnetic induction, sufficient drive power cannot be obtained in the manhole, or sufficient reception level cannot be obtained due to significant attenuation of the radio signal, ensuring a predetermined communication quality. I couldn't.

  It is an object of the present invention to provide a resonance type wireless power transmission device capable of stably performing power feeding and communication by an electromagnetic induction method between a power transmission side device outside a manhole and a power reception side device inside a manhole. To do.

1st invention arrange | positions the power transmission side apparatus outside a manhole, arrange | positions a power receiving side apparatus inside a manhole, and the power transmission side resonance coil electrically couple | bonded with the power transmission side coil of a power transmission side apparatus by electromagnetic induction, Resonance type that uses the resonance phenomenon between the power receiving side coil of the power receiving side device and the power receiving side resonance coil electrically coupled by electromagnetic induction to transmit power from the power source of the power transmitting side device to the load of the power receiving side device In the wireless power transmission device, the radius of the manhole cover is R1, the radius of the power receiving resonance coil is R2, the distance between the plane with the manhole cover and the center of the power receiving resonance coil is D1, and the center of the cover is in the vertical direction. When the distance between the passing center line and the straight line passing through the center of the power receiving resonance coil in the vertical direction is D2, and the inclination of the power receiving resonance coil with respect to the vertical direction is θ (0 to 90 degrees), the power receiving side Resonance coil is manhole As an installation condition that fits in the neck at the bottom of the lid, R1 ≧ D2 + R2 · cosθ (1)
D1 ≧ R2 · sinθ (2)
And a virtual cylinder connecting the power-receiving-side resonance coil and the power-transmitting-side resonance coil and the manhole cover do not overlap D1 · tanθ + D2 ≧ R2 / cosθ + R1 (3)
The power transmission side resonance coil is installed opposite to the power reception side resonance coil at positions D1 and D2 in the manhole.

In the resonant wireless power transmission device according to the first aspect of the invention, when the upper limit value of the interval at which power supply or signal transmission is possible between the power transmission side resonance coil and the power reception side resonance coil is Dsr, As for the coil, the condition that the distance from the resonance coil on the power transmission side does not exceed the upper limit value Dsr is as follows: Dsr ≧ D1 / cosθ + R2 · tanθ (4)
The power transmission side resonance coil is installed at positions D1 and D2 in the manhole to be opposite to the position where the distance from the power reception side resonance coil is Dsr or less.

According to a second aspect of the present invention, a power transmission side device is disposed outside the manhole, a power reception side device is disposed inside the manhole, and a power transmission side resonance coil electrically coupled to the power transmission side coil of the power transmission side device by electromagnetic induction Resonance type that uses the resonance phenomenon between the power receiving side coil of the power receiving side device and the power receiving side resonance coil electrically coupled by electromagnetic induction to transmit power from the power source of the power transmitting side device to the load of the power receiving side device In the wireless power transmission device, the radius of the manhole cover is R1, the radius of the power receiving resonance coil is R2, the distance between the plane with the manhole cover and the center of the power receiving resonance coil is D1, and the center of the cover is in the vertical direction. The distance between the center line passing through and the straight line passing through the center of the power-receiving resonance coil in the vertical direction is D2, the thickness of the manhole cover is δ, the thickness of the manhole cover frame is D3, and the vertical of the power-receiving resonance coil The inclination with respect to the direction is θ (0 (The range of ˜90 degrees), the installation condition that the power-receiving resonance coil fits in the lower neck of the manhole cover is R1 ≧ D2 + R2 · cosθ (1)
D1 ≧ R2 · sinθ + δ (2 ')
And the virtual cylinder connecting the power receiving resonance coil and the power transmitting resonance coil does not overlap with the manhole cover. D1 · tan θ + D2 ≧ R2 / cos θ + D3 · tan θ + R1 (3 ′)
The power transmission side resonance coil is installed opposite to the power reception side resonance coil at positions D1 and D2 in the manhole.

In the resonance-type wireless power transmission device according to the second invention, when the upper limit value of the interval at which power supply or signal transmission is possible between the power transmission side resonance coil and the power reception side resonance coil by the resonance phenomenon is Dsr, the power reception side resonance As for the coil, the condition that the distance from the resonance coil on the power transmission side does not exceed the upper limit value Dsr is as follows: Dsr ≧ D1 / cosθ + R2 · tanθ (4)
The power transmission side resonance coil is installed at positions D1 and D2 in the manhole to be opposite to the position where the distance from the power reception side resonance coil is Dsr or less.

  Since the present invention sets the position and inclination of the power receiving side resonance coil so as to avoid the influence of the manhole cover, power is fed between the power transmitting side device outside the manhole and the power receiving side device inside the manhole by electromagnetic induction. And communication can be performed stably.

It is a figure which shows the structural example of the resonance type wireless power transmission apparatus of this invention. It is a figure which shows the positional relationship 1 of the resonance type radio | wireless power transmission apparatus of this invention, and a manhole. It is a figure which shows the positional relationship 2 of the resonance type radio | wireless power transmission apparatus of this invention, and a manhole. It is a figure which shows the positional relationship 3 of the resonance type radio | wireless power transmission apparatus of this invention, and a manhole. It is a figure which shows the example 1 of transmission data and a received waveform. It is a figure which shows the example 2 of transmission data and a received waveform. It is a figure which shows the example 3 of transmission data and a received waveform. 3 is a diagram illustrating a configuration example of a demodulation unit 12. FIG. It is a figure which shows the structural example of a resonance type wireless power transmission apparatus. It is a figure which shows the example of S parameter (S21) of a resonance coil.

FIG. 1 shows a configuration example of a resonance type wireless power transmission apparatus of the present invention.
In FIG. 1, the resonance type wireless power transmission device includes a power transmission side device 10 that is responsible for power transmission and a power reception side device 20 that receives the transmitted power, and transmits transmission data from the power reception side device 20 to the power transmission side device 10. Includes a configuration for transmitting. The flow of power and transmission data from the power transmission side device 10 to the power reception side device 20 is downward, and the flow of transmission data from the power reception side device 20 to the power transmission side device 10 is upward.

  The power transmission side device 10 includes a power source 11, a demodulation unit 12 that restores uplink transmission data sent from the power reception side device 20, a power transmission side coil 13, a power transmission side resonance coil 14, and a frequency adjustment unit 15 that adjusts the power frequency of the power source 11. Is provided. The power receiving side device 20 includes a power receiving side resonance coil 21, a power receiving side coil 22, a load 23, a resistor 24, a switch 25, and a control unit 26. The power transmission side coil 13 and the power transmission side resonance coil 14 are electrically coupled by electromagnetic induction. The power transmission resonance coil 14 and the power reception resonance coil 21 are electrically coupled by resonance. The power receiving side resonance coil 21 and the power receiving side coil 22 are electrically coupled by electromagnetic induction. As a result, power can be supplied from the power source 11 to the load 23 and the control unit 26.

  Here, for the sake of simplicity, the impedance of the load 23 alone is not changed, and the impedance when the right side is viewed from B-B ′ in the figure is referred to as load impedance. The load impedance can take two states by selecting whether or not the resistor 24 is passed when the switch 25 is turned on / off. The control unit 26 is configured to turn on and off the switch 25 in accordance with transmission data and change the load impedance. However, in the configuration of the present embodiment, the power supply to the load 23 is continued because the connection to the load 23 is not released regardless of whether the switch 25 is on or off.

  In the configuration of FIG. 1, the resistor 24 and the switch 25 are connected in parallel, and the resistor 24 and the load 23 are connected in series. However, the resistor 24 and the switch 25 are connected in series, and the resistor 24 and the load 23 are connected. May be connected in parallel. Further, the circuit constant CR may be adjusted by a variable configuration of resistance and capacitance.

  Since the power receiving side device 20 and the power transmitting side device 10 are electrically coupled, the change in the load impedance is a change in impedance when the power receiving side device 20 is viewed from AA ′ of the power transmitting side device 10, and the current or voltage is changed. Appears as a change. The demodulator 12 detects this change and restores the transmission data transmitted from the power receiving side device 20. Details of the transmission data transmission principle will be described later.

FIG. 2 shows a positional relationship 1 between the resonance type wireless power transmission apparatus of the present invention and a manhole.
In FIG. 2, for the sake of simplicity, only the power transmission side resonance coil 14 of the power transmission side device 10 and the power reception side resonance coil 21 of the power reception side device 20 are shown here for the sake of simplicity. The manhole is composed of a neck portion 31 through which a person enters and exits and a manhole body 32, and a lid 33 is provided on the upper portion of the neck portion 31.

  Here, the radius of the lid 33 of the manhole is R1, the radius of the power receiving resonance coil 21 installed in the manhole is R2, the distance between the plane L0 with the lid 33 and the center of the power receiving resonance coil 21 is D1, and the lid 33 The distance between the center line L1 passing through the center of the coil in the vertical direction and the straight line L2 passing through the center of the power receiving resonance coil 21 in the vertical direction is D2, and the inclination of the power receiving resonance coil 21 with respect to the vertical direction is θ (0 to 90 degrees). Range). The power transmission side resonance coil 14 is assumed to be in a position facing the power reception side resonance coil 21 and has a radius R2. The power transmission resonance coil 14 is always above the ground (plane L0), and the distance from the power reception resonance coil 21 is the shortest at a position where one end is in contact with the ground.

First, as an installation condition for the power receiving side resonance coil 21 to fit within the size (radius R1) of the neck 31 of the manhole, the relationship between the radius R2 and inclination θ of the power receiving side resonance coil 21 and the position (D1, D2) is:
R1 ≧ D2 + R2 · cosθ (1)
D1 ≧ R2 · sinθ (2)
It becomes. Where R1, R2, D1, D2 are given,
R1 <D2 + R2
D1 <R2
(1) determines the lower limit of θ (the angle at which the power receiving resonance coil 21 cannot be further lateral), and (2) determines the upper limit of θ (the power receiving resonance coil 21 is further vertical). Determine the angle that cannot be done.

Next, the conditions under which the virtual cylinder S connecting the power transmission side resonance coil 14 and the power reception side resonance coil 21 and the manhole cover 33 do not overlap will be described. Assuming that the intersection of the center line of the power receiving resonance coil 21 and the plane L0 is x and that one end of the major axis of the ellipse where the virtual cylinder S intersects the plane L0 is y, the interval X between x and L2, and the interval Y between x and y are It is expressed by the following formula. 2Y is the major axis of the ellipse where the virtual cylinder S intersects the plane L0.
X = D1 · tanθ
Y = R2 / cosθ

At this time, the condition that the virtual cylinder S and the lid 33 do not overlap is that if the thickness of the lid 33 is ignored,
X + D2 ≧ Y + R1
So
D1 · tanθ + D2 ≧ R2 / cosθ + R1 (3)
It becomes.

  This equation (3) determines the lower limit value of the inclination θ of the power receiving resonance coil 21 when R1, R2, D1, and D2 are given. That is, the lower limit value of the inclination θ of the power receiving resonance coil 21 is determined by the expressions (1) and (3), and the upper limit value of the inclination θ is determined by the expression (2).

  Here, if the inclination θ of the power receiving resonance coil 21 is fixed, the larger the value D2 indicating the deviation (offset) of the power receiving resonance coil 21 from the center line L1 of the lid 33, or the power receiving resonance coil 21 is arranged. The greater the value of D1 indicating the depth to be processed, the lower the ratio of the virtual cylinder S and the lid 33 overlapping. Further, if D1 and D2 are fixed, the larger the inclination θ of the power receiving resonance coil 21 is, the smaller the ratio of overlapping the virtual cylinder S and the lid 33 decreases.

  On the other hand, the larger the value of D1, the smaller θ can be. However, D1 has a limit because it depends on the length of the neck 31 of the manhole. Further, θ can be made smaller as D2 is larger, but D2 has a limit because it depends on the difference between the diameter of the lid 33 (≈the inner diameter of the neck 31) and the diameter of the power receiving resonance coil 21. Further, if θ becomes a large value, the power transmission resonance coil 14 is above the plane L0 (ground), so that the interval between the power transmission resonance coil 14 and the power reception resonance coil 21 is widened, and power feeding or signal transmission is possible. Since there is a possibility that the distance exceeds a certain distance, there is a limit to θ.

  Assuming that the maximum distance (feedable distance) at which power supply or signal transmission is possible between the power transmission resonance coil 14 and the power reception resonance coil 21 is Dsr, the inclination θ of the power reception resonance coil 21 is large as described above. If it becomes a value, the space | interval of the power transmission side resonance coil 14 and the power reception side resonance coil 21 on the ground will spread, and it will exceed the power supply possible distance Dsr. Here, the condition where the coil interval on the power receiving side / power transmission side does not exceed the power supply possible distance Dsr will be described.

FIG. 3 shows a positional relationship 2 between the resonance type wireless power transmission apparatus of the present invention and a manhole.
In FIG. 3, parameters R1, R2, D1, D2, θ, X, and Y are the same as those shown in FIG. Here, when one end of the power transmission side resonance coil 14 is brought into contact with the plane L0 to bring the power transmission side resonance coil 14 and the power reception side resonance coil 21 closest to each other, the intersection of the center line of the power reception side resonance coil 21 and the plane L0. The distance V between x and the power receiving resonance coil 21 and the distance W between the intersection x and the power transmission resonance coil 14 are expressed by the following equations, respectively. Note that the thicknesses of the power transmission side resonance coil 14 and the power reception side resonance coil 21 are ignored.
V = D1 / cosθ
W = R2 · tanθ

At this time, the condition that the coil interval on the power reception side / power transmission side does not exceed the power supply possible distance Dsr is:
Dsr ≧ V + W
So
Dsr ≧ D1 / cosθ + R2 / tanθ (4)
It becomes.

  This equation (4) determines the upper limit value of the inclination θ of the power receiving resonance coil 21 when R2, D1, and Dsr are given. That is, the upper limit value of the inclination θ of the power receiving resonance coil 21 is determined by the equations (2) and (4).

In the above, when the radius R1 of the lid 33 is a fixed value, and the radius R2 of the power receiving side resonance coil 21 and the power transmission side resonance coil 14 and the feedable distance Dsr are fixed values corresponding to a required gain, the power receiving side resonance coil Using the position (D1, D2) of 21 and the inclination θ as variables, values satisfying the expressions (1) to (4) within the allowable ranges are calculated. For example, when R1 = 40 cm, R2 = 30 cm, and Dsr = 300 cm, if D1 = 55 cm, D2 = 10 cm, and θ = 60 °,
(1) Formula: 40> 25
(2) Formula: 55> 26
(3) Formula: 105.2> 100
(4) Formula: 300> 162
And all the conditions can be satisfied.

  In the above description, the thickness of the manhole cover 33 is ignored, but the case where the thickness of the manhole cover 33 is δ and the thickness of the frame of the manhole cover 33 is D3 will be described.

FIG. 4 shows a positional relationship 3 between the resonance type wireless power transmission apparatus of the present invention and a manhole.
In FIG. 4, parameters R1, R2, D1, D2, θ, X, Y, V, and W are the same as those shown in FIGS. Here, X, Y, and the length Z that the frame of the manhole cover 33 projects onto the plane L0 with the inclination θ of the power reception resonance coil 21 are expressed by the following equations.
X = D1 · tanθ
Y = R2 / cosθ
Z = D3 · tanθ

At this time, the condition that the virtual cylinder S connecting the power transmission side resonance coil 14 and the power reception side resonance coil 21 does not overlap the frame of the manhole cover 33 is as follows:
X + D2> Y + Z + R1
So
D1 · tanθ + D2 ≧ R2 / cosθ + D3 · tanθ + R1 (3 ')
It becomes.

  This expression (3 ′) determines the lower limit value of the inclination θ of the power receiving resonance coil 21 when R1, R2, D1, D2, and D3 are given. That is, when considering the thickness D3 of the frame of the manhole cover 33, the lower limit value of the inclination θ of the power receiving resonance coil 21 is determined by the equations (1) and (3 ′).

On the other hand, the condition that the coil interval on the power receiving side / power transmitting side does not exceed the power supply possible distance Dsr is not expressed by the thickness δ of the manhole cover 33 and the thickness D3 of the frame, and is expressed by the following equation (4). However, the thickness δ of the lid 33 is involved in the installation conditions in which the power receiving resonance coil 21 is placed in the neck 31 of the manhole.
D1 ≧ R2 · sinθ + δ (2 ')
It becomes. That is, when the thickness δ of the lid 33 is taken into consideration, when R1, R2, D1, D2, D3, Dsr, δ are given, the power-receiving-side resonance coil 21 is expressed by the equations (2 ′) and (4). The upper limit value of the inclination θ is determined.

  By the way, when the power receiving resonance coil 21 of the power receiving device 20 is installed in the manhole, the position and inclination determined by D1, D2, and θ are adjusted. However, since the power receiving side resonance coil 21 has a considerable size with respect to the inner diameter of the neck portion 31 of the manhole, when the cover 33 is opened, the power receiving side device 20 including the power receiving side resonance coil 21 is removed and a person enters and exits. Need to be possible.

  Here, power is supplied from the power transmission side device 10 outside the manhole to the power reception side device 20 installed in the manhole in the relationship shown in FIGS. 2 to 4, and transmitted from the power reception side device 20 operating with the received power. For example, a control form is conceivable in which the received power value is transmitted as data, and the power supply frequency is adjusted to approach the resonance frequency so that the received power value restored by the power transmission side device 10 increases. Hereinafter, a method for restoring transmission data transmitted from the power receiving side device 20 by the power transmitting side device 10 will be described based on the configuration of FIG. 1.

  FIG. 5 shows a waveform obtained by envelope detection of the current or voltage in the demodulator 12 of the power transmission side device 10, and it can be seen that the current or voltage changes in conjunction with the change in the transmission data. The demodulation unit 12 can restore the transmission data transmitted from the power receiving side device 20 by sampling this change at an appropriate timing.

  However, when the power supply frequency of the power transmission side device 10 is different from the resonance frequency, a reception waveform as shown in FIG. 6 is obtained. The average reception level (reception power) not only decreases compared to the case of FIG. 5, but also changes in the amplitude of the signal waveform are reduced. Furthermore, when the power supply frequency of the power transmission side device 10 is greatly different from the resonance frequency, the change in the amplitude of the signal waveform becomes very small, and it is difficult to restore the transmission data.

  On the other hand, the demodulator 12 of the power transmission side device 10 can observe a transient response of current or voltage corresponding to a change in transmission data as shown in FIG. Here, the transient response of the current or voltage observed in the power transmission side device 10 is a part where the switch 25 is turned on / off according to transmission data and the current or voltage rises and falls according to the change in the load impedance accompanying it. This is a phenomenon in which the waveform changes greatly. The control unit 26 of the power receiving side device 20 operates the switch 25 so that the transmission data corresponds to the occurrence of the transient response, and the demodulation unit 12 of the power transmission side device 10 restores the transmission data from the presence of the occurrence of the transient response. To do.

FIG. 8 shows a configuration example of the demodulator 12.
In FIG. 8, the demodulation unit 12 includes a detection unit 121, an A / D conversion unit 122, and a code determination unit 123. The detector 121 detects the received waveform, that is, the current or voltage in the power transmission side device 10. The detection output is digitized by the A / D converter 122, and the bit is determined by the code determination unit 123 and output.

  The code determination unit 123 has two code determination logics. The sign determination logic 1 outputs “1” when a positive transient response is determined from the received waveform, and outputs “0” when a negative transient response is determined, and determines a steady state (no transient response). If it does, the previous determination result is output. The code determination for the steady state may be configured such that the previous determination result is stored in a storage unit connected to the code determination unit 123 and read from the storage unit when the steady state is determined. The configuration may be such that the previous determination result is output until a positive or negative transient response is determined.

  The control unit 26 of the power receiving device 20 corresponding to the code determination unit 123 operates the switch 25 so as to correspond to the transmission data as it is. That is, if the transmission data is 1, the switch 25 is turned on, and if the transmission data is 0, the switch 25 is turned off. The sign determination unit 123 determines the bit at the timing when the transmission data is inverted and a transient response occurs, and outputs the same bit as the bit immediately before the transient response occurs at the timing when the transient response does not occur, thereby restoring the transmission data. To do.

  By detecting the presence or absence of such a transient response, even if the power supply frequency of the power transmission side device 10 is slightly deviated from the resonance frequency, the transmission data transmitted from the power reception side device 20 by the power transmission side device 10 can be restored.

  Therefore, when the power receiving side device 20 detects a shift in power source frequency of the power transmitting side device 10 with respect to the resonance frequency due to a decrease in received power, the control unit 26 generates a corresponding control signal and switches the switch 25 to the above pattern. , The control signal is restored by the demodulator 12 of the power transmission side device 10, and the deviation of the power supply frequency of the power transmission side device 10 with respect to the resonance frequency can be notified. However, since the power receiving side device 20 does not know the direction or amount of deviation of the power source frequency of the power transmitting side device 10 with respect to the resonance frequency, for example, a power receiving power value is transmitted as a control signal. The demodulator 12 of the power transmission side device 10 reads the received power value from the control signal, and adjusts the power frequency of the power source 11 via the frequency adjuster 15 when it is less than the specified received power value. At this time, the power supply frequency can be adjusted so as to approach the resonance frequency by feedback control of the shift direction and shift amount of the power supply frequency from the change in the received power value with respect to the shift of the power supply frequency.

DESCRIPTION OF SYMBOLS 10 Power transmission side apparatus 11 Power supply 12 Demodulation part 121 Detection part 122 A / D conversion part 123 Code | symbol determination part 13 Power transmission side coil 14 Power transmission side resonance coil 15 Frequency adjustment part 20 Power reception side apparatus 21 Power reception side resonance coil 22 Power reception side coil 23 Load 24 Resistance 25 Switch 26 Control unit 31 Manhole neck 32 Manhole body 33 Lid

Claims (4)

A power transmission side device is disposed outside the manhole, a power reception side device is disposed inside the manhole, a power transmission side resonance coil electrically coupled to a power transmission side coil of the power transmission side device by electromagnetic induction, and power reception by the power reception side device In the resonance type wireless power transmission device that transmits power from the power source of the power transmission side device to the load of the power reception side device using the resonance phenomenon between the side coil and the power reception side resonance coil that is electrically coupled by electromagnetic induction,
The radius of the manhole cover is R1, the radius of the power receiving resonance coil is R2, the distance between the flat surface of the manhole cover and the center of the power receiving resonance coil is D1, and the center passes through the center of the cover in the vertical direction. When the distance between the line and the straight line passing through the center of the power reception resonance coil in the vertical direction is D2, and the inclination of the power reception resonance coil with respect to the vertical direction is θ (range of 0 to 90 degrees),
R1 ≧ D2 + R2 · cosθ (1) As an installation condition in which the power-reception-side resonance coil is placed in the lower neck of the manhole cover
D1 ≧ R2 · sinθ (2)
And a virtual cylinder connecting the power receiving side resonance coil and the power transmission side resonance coil does not overlap with the manhole cover as follows: D1 · tan θ + D2 ≧ R2 / cos θ + R1 (3)
Is installed at a position D1, D2 in the manhole with an inclination θ or more,
The power transmission-side resonance coil is installed to face the power-receiving-side resonance coil. In the resonance type wireless power transmission device according to claim 1,
When the upper limit value of the interval at which power supply or signal transmission is possible between the power transmission side resonance coil and the power reception side resonance coil by resonance phenomenon is Dsr,
The power receiving resonance coil has a condition that the distance from the power transmission resonance coil does not exceed the upper limit value Dsr. Dsr ≧ D1 / cosθ + R2 · tanθ (4)
Are installed at the inclinations of θ or less at positions D1 and D2 in the manhole.
The resonance type wireless power transmission device, wherein the power transmission side resonance coil is disposed opposite to a position where the distance from the power reception side resonance coil is equal to or less than Dsr. A power transmission side device is disposed outside the manhole, a power reception side device is disposed inside the manhole, a power transmission side resonance coil electrically coupled to a power transmission side coil of the power transmission side device by electromagnetic induction, and power reception by the power reception side device In the resonance type wireless power transmission device that transmits power from the power source of the power transmission side device to the load of the power reception side device using the resonance phenomenon between the side coil and the power reception side resonance coil that is electrically coupled by electromagnetic induction,
The radius of the manhole cover is R1, the radius of the power receiving resonance coil is R2, the distance between the flat surface of the manhole cover and the center of the power receiving resonance coil is D1, and the center passes through the center of the cover in the vertical direction. D2 is the distance between the line and a straight line passing through the center of the power-receiving resonance coil in the vertical direction, δ is the thickness of the manhole cover, D3 is the thickness of the manhole cover frame, and the power-receiving resonance coil When the inclination relative to the vertical direction is θ (range of 0 to 90 degrees),
R1 ≧ D2 + R2 · cosθ (1) As an installation condition in which the power-reception-side resonance coil is placed in the lower neck of the manhole cover
D1 ≧ R2 · sinθ + δ (2 ')
And a virtual cylinder connecting the power-receiving-side resonance coil and the power-transmitting-side resonance coil and the manhole cover are not overlapped as follows: D1 · tanθ + D2 ≧ R2 / cosθ + D3 · tanθ + R1 (3 ′)
Is installed at a position D1, D2 in the manhole with an inclination θ or more,
The power transmission-side resonance coil is installed to face the power-receiving-side resonance coil. In the resonance type wireless power transmission device according to claim 3,
When the upper limit value of the interval at which power supply or signal transmission is possible between the power transmission side resonance coil and the power reception side resonance coil by resonance phenomenon is Dsr,
The power receiving resonance coil has a condition that the distance from the power transmission resonance coil does not exceed the upper limit value Dsr. Dsr ≧ D1 / cosθ + R2 · tanθ (4)
Are installed at the inclinations of θ or less at positions D1 and D2 in the manhole.
The resonance type wireless power transmission device, wherein the power transmission side resonance coil is disposed opposite to a position where the distance from the power reception side resonance coil is equal to or less than Dsr.

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