JP2018102041A - Contactless power transmission device and contactless power reception device - Google Patents

Abstract

[PROBLEMS] To determine the maximum inter-coil distance depending on the size of the coil, but in the prior art, the size of the coil is constant, and it is attempted to maximize the amount of received power only by power control of a plurality of coils. Therefore, non-contact power feeding cannot be performed with the maximum efficiency in the distance between the coils at the position of the mobile terminal or the accessory that receives power. The size of a coil is equivalently changed by flowing a current that cancels out a magnetic field generated by one adjacent side of the adjacent coil, and the adjacent coil is combined. Is identified. Coil selection and output that is equivalent to the best coil equivalent to the specified position. [Selection] Figure 17

Description

  The present invention relates to a wireless power feeding technique, for example, to a technique capable of efficiently transmitting and receiving power in wireless charging in which a battery such as a small portable device such as a portable terminal or an electric vehicle is charged without contact.

  While portable terminals and the like have become smaller and thinner, connection of connectors during charging is troublesome, and terminals such as headphones tend to be abolished from portable devices. For this reason, the headphones are wirelessly connected and a power source is required in the headphones. For small items such as headphones, it is difficult to provide a charging terminal, so charging by wireless power feeding is desired. In addition, since small items cannot be placed in close contact with the surface of the charging stand, a resonance method that can be charged even if there is a certain distance is advantageous. On the other hand, charging by wireless power feeding becomes indispensable when the portable terminal also has no charging terminal. In addition, in the case of electric vehicles, in the case of wired charging, wireless charging is desirable because water may enter the connector and the contacts may be deteriorated when it is raining.

  For this reason, for example, Japanese Patent No. 5759388 (Patent Document 1) is known as a background art that eliminates wiring and supplies power wirelessly. In Patent Document 1, a charging box is provided, and charging is performed by putting a mobile terminal or a small article in the charging box. A plurality of power transmission coils are attached to each wall surface of the charging box, and the total power received by the mobile terminal or the accessory is determined, and control is performed so as to increase the total power received by changing the power transmission power level. Points are listed.

Japanese Patent No. 5759388

  In the wireless power feeding, the distance between the coils that is the maximum efficiency is determined by the size of the coil. However, in Patent Document 1, the size of the coil is constant, and it is attempted to maximize the amount of received power only by power control of a plurality of coils. Yes. For this reason, the subject that the non-contact electric power feeding by the maximum efficiency in the distance between coils in the position of the portable terminal and small articles | goods received could not be performed.

  An object of the present invention is to construct a non-contact power transmission device and a non-contact power reception device that can efficiently transmit and receive power to accessories such as portable terminals and headphones.

  The present invention is a non-contact power transmission device that has at least two power transmission coils on the same plane and feeds power from the power transmission coil to the non-contact power reception device via the power reception coil. And independently adjusting the currents flowing through the first power transmission coil, the second power transmission coil having a side adjacent to the first power transmission coil and facing each other, and the first power transmission coil and the second power transmission coil. Canceling the magnetic field generated by the adjacent and opposite sides of the first power transmission coil and the second power transmission coil, or by the magnetic field generated by the respective adjacent and opposite sides in the power receiving coil And a control unit that controls the output adjustment unit so as to perform an adjustment process in which currents generated by the electromotive force cancel each other.

  According to the present invention, it is possible to detect the position of a power receiving unit that is appropriately placed and to obtain an optimum coil size for the position, so that there is an effect that power can be transmitted and received in an efficient state with respect to that position. .

1 is a configuration block diagram of a non-contact power transmission device of a wireless power feeding system in Embodiment 1. FIG. 1 is a configuration block diagram of a contactless power receiving device that receives wireless power from a contactless power transmitting device in Embodiment 1. FIG. It is a block diagram of the power transmission coil of the non-contact power transmission apparatus in Example 1. It is a block diagram of the receiving coil of the non-contact power receiving apparatus in Example 1. It is arrangement | positioning explanatory drawing of the power transmission coil of the non-contact power transmission apparatus in Example 1, and the receiving coil of a non-contact power receiving apparatus. It is characteristic explanatory drawing of the radio | wireless electric power feeding using the power transmission coil of the non-contact power transmission apparatus in Example 1, and the receiving coil of a non-contact power receiving apparatus. It is a characteristic view of the wireless electric power feeding using the power transmission coil of the non-contact power transmission device in Example 1, and the power reception coil of the non-contact power reception device. It is operation | movement explanatory drawing of the power transmission coil of the non-contact power transmission apparatus in Example 1, and the principle figure of the wireless electric power feeding using the receiving coil of a non-contact power receiving apparatus. It is explanatory drawing of the power transmission coil of the non-contact power transmission apparatus in Example 1. FIG. It is a block diagram of the power transmission coil of the non-contact power transmission apparatus in Example 1. It is operation | movement explanatory drawing of the power transmission coil of the non-contact power transmission apparatus in Example 1. FIG. FIG. 10 is another operation explanatory diagram of the power transmission coil of the contactless power transmission device according to the first embodiment. FIG. 10 is another operation explanatory diagram of the power transmission coil of the contactless power transmission device according to the first embodiment. It is another block diagram of the power transmission coil of the non-contact power transmission apparatus in Example 1. It is another block diagram of the power transmission coil of the non-contact power transmission apparatus in Example 1. It is a block diagram of the output switching adjustment part of the non-contact power transmission apparatus in Example 1. It is an operation | movement flowchart of the non-contact power transmission apparatus and non-contact power receiving apparatus in Example 1. FIG. It is another block diagram and operation | movement explanatory drawing of the power transmission coil of the non-contact power transmission apparatus in Example 1. FIG. It is an operation | movement flowchart of the non-contact power transmission apparatus and non-contact power receiving apparatus in Example 1. FIG. 6 is a configuration block diagram of a non-contact power transmission device of a wireless power feeding system in Embodiment 2. FIG. It is an operation | movement flowchart of the non-contact power transmission apparatus in Example 2, and a non-contact power receiving apparatus. FIG. 10 is a configuration block diagram of a contactless power transmission device of a wireless power feeding system according to a third embodiment. FIG. 10 is a configuration block diagram of a contactless power receiving device that receives wireless power from a contactless power transmitting device according to a third embodiment. FIG. 10 is a configuration block diagram of a detection unit of a non-contact power transmission apparatus according to a third embodiment. It is a block diagram of the load modulation | alteration part of the non-contact power receiving apparatus which receives the wireless power from the non-contact power transmission apparatus in Example 3. It is a block diagram of the detection part of the non-contact power transmission apparatus in Example 3. FIG. 10 is another configuration block diagram of a contactless power receiving device that receives wireless power from a contactless power transmitting device according to a fourth embodiment. It is an operation | movement flowchart of the non-contact power transmission apparatus in Example 4, and the non-contact power receiving apparatus of FIG. FIG. 10 is a configuration block diagram of a contactless power transmission device of a wireless power feeding system according to a fifth embodiment. It is an operation | movement flowchart of the non-contact power transmission apparatus in Example 5. It is an example of use of the non-contact power transmission apparatus in Example 6. FIG. 10 is a configuration block diagram of a contactless power transmission device that transmits wireless power to a contactless power receiving device according to a sixth embodiment. FIG. 10 is a configuration block diagram of a contactless power receiving device of a wireless power feeding system according to a seventh embodiment. FIG. 9 is a detailed configuration block diagram of a non-contact power receiving device according to a seventh embodiment. It is an operation | movement flowchart of the non-contact power receiving apparatus and non-contact power transmission apparatus in Example 7. 10 is a usage example of a non-contact power receiving device in Example 8.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a configuration block diagram of a contactless power transmission device of a wireless power feeding system according to the present embodiment, and FIG. 2 is a configuration block diagram of a contactless power reception device according to the embodiment. The non-contact power transmission apparatus 100 has a box shape, and wirelessly feeds power by putting a non-contact power receiving apparatus in the box. FIG. 1 shows a case where two devices, a non-contact power receiving device 200a and a non-contact power receiving device 200b, are included. Upon receiving power from the output switching adjustment unit 103 controlled by the control unit 102, the power transmission coil 101 radiates power. The non-contact power receiving devices 200a and 200b have basically the same structure, and have the block structure shown in FIG. The power is received by the power receiving coil 201, rectified by the rectifying unit 202 to direct current, the direct current is stabilized by the converter 203, and the battery 204 is charged. The level detection unit 205 detects the power reception level from the output of the rectification unit 202 and transmits the power reception level from the communication antenna 208 using the wireless unit 207 via the control unit 206. The non-contact power transmission apparatus 100 receives the transmitted power reception level with the communication antenna 104, demodulates it with the wireless unit 105, and sends the information to the control unit 102. The control unit 102 controls the output switching adjustment unit 103 using the power reception level information.

  FIG. 3 illustrates the power transmission coil 101 that is on the XY plane in the XYZ coordinates illustrated in FIG. 1 and includes the minimum coils 301, 302, 303, and 304. In FIG. 3, the minimum coils 301, 302, 303, and 304 are the same shape and the same size, and are rectangular and spiral flat coils.

  FIG. 4 shows the configuration of the power receiving coil. 4A shows the power receiving coil 201a of the non-contact power receiving apparatus 200a, and FIG. 4B shows the power receiving coil 201b of the non-contact power receiving apparatus 200b. In the example of FIG. 4, the power receiving coil 201a is square and has almost the same area and the same side length as the minimum coil 301, and the power receiving coil 201b has almost twice the area of the power receiving coil 201a and one side is almost the same. Is almost twice as large. However, this shape, area, and side length may be anything. In addition, as a relationship between the power transmission coil and the power reception coil, the size (area) of the power transmission coil is less than the size (area) of the power reception coil. In other words, when both the power transmission coil and the power reception coil are rectangular, the longest side of the minimum cell of the power transmission coil has a relationship configured to be equal to or shorter than the length of the shortest side of the power reception coil. As will be described later, this is because control by a combination of power transmission coils is possible. Next, power reception characteristics of a general magnetic resonance coupling type wireless power feeding will be described. FIG. 5 shows an arrangement when the distance between the power transmission coil and the power reception coil is changed. First, the relationship between the power transmission coil 501 and the power reception coil 502 will be described. In FIG. 5, there are a flat coil power transmission coil 501 and power reception coil 502 on the XY plane, and the distance between them is taken as the Z axis. Here, it is assumed that the power transmission coil 501 and the power reception coil 502 have the same shape and the same area, and the center is not shifted by power transmission and reception.

  FIG. 6 shows power reception characteristics, where the horizontal axis represents frequency and the vertical axis represents power reception level. Depending on the distance between the power receiving coil and the power transmitting coil, (a) tight coupling (bimodal characteristics), (b) critical coupling (single peak characteristics), and (c) loose coupling (single peak characteristics) are shown. In the case of (b) critical coupling, power can be received most efficiently and the power receiving level can be increased.

  Now, assuming that the power transmission coil 501 and the power reception coil 502 have the critical coupling shown in FIG. 6B at the distance Z = Z0 shown in FIG. 5B, Z <Z0 in FIG. ), And when Z = Z1> Z0 in FIG. 5C, the loose coupling in FIG. 6C is obtained.

  In addition, when the coils are different power transmission coils 503 and power reception coils 504, the characteristics change, and when Z = Z1, the critical coupling shown in FIG. 6B may occur. As described above, the power reception characteristics of the magnetic resonance coupling type wireless power feeding change depending on the shape and area of the power transmission coil and the power reception coil, or the distance between the power transmission coil and the power reception coil.

  FIG. 7 shows a characteristic diagram of wireless power feeding using a power transmission coil and a power reception coil. The horizontal axis in FIG. 7 is the distance between the transmission / reception coil and the power reception coil, and the vertical axis is the power reception level of the power reception coil. As shown in FIG. 7, it can be seen that the shape and area of the coil having the maximum efficiency differ depending on the distance between the transmitting and receiving coils.

  FIG. 8 shows an operation explanatory diagram for changing the size of the coil equivalently. As shown in FIG. 8A, two rectangular coils are arranged on the same XY plane so that the sides 801 and 802 face each other in parallel. A current I1 flows through the side 801, and a current I2 flows through the side 802. FIG. 8B shows this state viewed from the direction of the white arrow. At this time, when the strength of the magnetic field generated at an arbitrary point P is obtained, the following equation is obtained.

Hx = (I1 / 2π) × (sin θ1 / r1)
+ (I2 / 2π) × (sin θ2 / r2)
Hz = (I1 / 2π) × (cos θ1 / r1)
+ (I2 / 2π) × (cos θ2 / r2)
If the direction of the power receiving coil at the point P is parallel to the XY plane, the magnetic field is not orthogonal to the power receiving coil and Hx does not contribute to power reception. Therefore, it is only necessary to consider Hz, and any r1 and r2 can be set to Hz = 0 by adjusting I1 and I2. When r1 = r2, if the magnitudes of I1 and I2 are the same and are in opposite phases, Hz = 0.

When the power receiving coil at the point P is inclined by α shown in FIG.
Hx · cosα = Hz · sinα
I1 and I2 may be adjusted so that In this way, the magnetic field contributing to power reception by the power receiving coil at an arbitrary point can be reduced to 0 by the adjustment process for adjusting I1 and I2. That is, the side 801 and the side 802 do not exist. Alternatively, since the currents generated by the electromotive force in the power receiving coil due to the magnetic fields of the sides 801 and 802 are in opposite directions, the currents cancel each other, and there appears to be no side of the power transmitting coil that contributes to power reception.

  FIG. 9 shows a case where the idea of FIG. 8 is applied to the power transmission coil of FIG. In FIG. 8, the side of the coil is a single line, but in the case of a spiral flat coil, there are actually several parallel lines. However, if they are collectively considered as sides 1001, 1002, 1003, and 1004 as shown in FIG. 9, they can be considered in the same manner as in FIG.

  3 and the subsequent description of the power transmitting coil and the power receiving coil, only the coil is shown for convenience. However, in the case of magnetic resonance coupling type wireless power feeding, the series resonance type shown in FIG. A capacitor is connected as in the parallel resonance type shown in (b), and resonance is caused by the capacitance of the inductor of the coil and the capacitor.

  As described above, when the minimum coils 301, 302, 303, and 304 shown in FIG. 3 have the same rectangular shape and the same size, if currents of the same magnitude and phase are passed through the coils, The magnetic field can be canceled out.

  Next, the size and position of the power transmission coil that can be made with the coil of FIG. 3 will be described.

  FIG. 11 shows that the minimum coil size can take four positions (a), (b), (c), and (d).

  FIG. 12 is a configuration in which two minimum coils are combined, and can take four positions (a), (b), (c), and (d), and magnetic fields at sides 1301, 1302, 1303, and 1304, respectively. Will be countered.

  FIG. 12E shows the maximum coil size in a configuration in which four minimum coils are combined. The magnetic field is canceled at the sides 1401, 1402, 1403, and 1404. Although not shown, a configuration in which three minimum coils are combined is also conceivable. In that case, the minimum coils 301, 302, 303, the minimum coils 301, 302, 304, or the minimum coils 303, 304, 301, Or, it is a combination of the minimum coils 303, 304, and 302.

  In addition, as a combination of coils, two coils on the diagonal shown in FIGS. 13A and 13B can be combined.

  The configuration of the coil shown in FIG. 13C is obtained by adding a coil 1601 to the central portion of the configuration of the coil shown in FIG. Adding the coil 1601 has an effect of selecting a coil with good power receiving efficiency by selecting the coil 1601 when the power receiving coil comes to the central portion of the coil shown in FIG.

  FIG. 13D shows a case where the coil in FIG. 3 is an even combination of 2 × 2 and is converted to an odd number of 3 × 3. If it is set to an odd number, there is an effect that it is possible to select a coil with high power reception efficiency by selecting the coil at the center 1705 without using the configuration as shown in FIG. It is also possible to adopt an odd number × even number configuration.

  FIG. 14 is a configuration diagram of a power transmission coil composed of coils of different sizes. Coils 1809 and 1810 are twice as long as the sides of coils 1801 to 1808. For example, the coil 1805, the coil 1806, and the coil 1809 can be combined into a coil having a size of these three. In general, in the case of a coil having a side size n that is an integral multiple of the side of the smallest coil, the magnetic field can be canceled by the sides of the n smallest coils arranged. The configuration of FIG. 14 has an effect that an optimal combination of coils can be selected when the size of the receiving coil is determined at the place where it is placed.

  FIG. 15 shows a case where the shape of the coil is not a square but a hexagon. It is also possible to use a polygon instead of a hexagon. In the case of the polygonal shape, it is easy to arrange when the entire power transmission coil is circular, and when the power reception coil is circular, the power reception efficiency can be improved.

  FIG. 16 is a detailed explanatory diagram of the output switching adjustment unit 103 of FIG. In FIG. 16, the output switching adjustment unit 103 has output units 2000a, 2000b, 2000c, and 2000d for the minimum coils 301, 302, 303, and 304. Since the output units have the same configuration, the output unit 2000a. I will explain it. The output unit 2000a includes a class E amplifier including a resistor 2002, an FET 2003, a power supply 2004, a coil 2005, a capacitor 2006, a coil 2007, and a capacitor 2008, and a matching unit 2009. The class E amplifier can amplify the power at the resonance frequency by inputting the clock 2010a which is the resonance frequency of the magnetic resonance coupling type wireless power feeding to the gate of the FET 2003. By turning on and off the clock 2010a with the control signal 2011a by the AND gate 2001, the output ON and OFF of the output unit 2000a can be controlled. That is, the output can be selected by the control signals 2011a, 2011b, 2011c, and 2011d. The output level can be adjusted by adjusting the power supply 2004, and the output phase can be adjusted by adjusting the phases of the clocks 2010a, 2010b, 2010c, and 2010d.

  According to the configuration of FIG. 16, switching and the FET of the amplifier can be shared, so that simple and inexpensive output switching adjustment can be performed, and the fine adjustment of the matching unit 2009 allows performance variation of the class E amplifier unit preceding the matching unit 2009. There is an effect that can be absorbed.

FIG. 17 shows a control flow in which the size of the power transmission coil is equivalently changed to achieve the maximum power receiving efficiency. FIG. 17 shows the case of the non-contact power transmission device 100 of FIG. 1, the non-contact power reception device 200 of FIG. 2, and the power transmission coil configuration of FIG. In FIG.
S2101: Start S2102: Minimum coils 301, 302, 303, 304, that is, one of (a), (b), (c), and (d) shown in FIG. Do.
S2114: When the non-contact power receiving apparatus 200 is in the XY position that is activated by the minimum coil that is transmitting at that time, it is activated and the level detection unit 205 detects the power reception level.
S2115: The detected power reception level and the contactless power receiving device identification information, that is, the signal identifying the contactless power receiving device 200a or 200b in the example of FIG. It is transmitted from 208.
S2103: Confirm the power receiving information from the non-contact power receiving apparatus 200. Alternatively, when there is no contactless power receiving device 200 at the XY position that is activated by the minimum coil that transmits power at that time, no reception information is received, and thus time-out occurs for a certain time and the process proceeds to the next processing S2104.
S2104: It is determined whether or not the minimum coils 301, 302, 303, and 304, ie, (a), (b), (c), and (d) shown in FIG.
S2105: When all the confirmations are not completed, the next minimum coil is selected, and the process returns to S2102.
S2106: When all the confirmations are completed, the power reception identification information and the power reception level or time-out at each minimum coil position are confirmed, and the reception level for each identification information of the non-contact power reception apparatus 200 is compared. It is determined that the non-contact power receiving apparatus 200 indicated by the identification information is present at the position of the large minimum coil. In addition, there is a possibility that a plurality of minimum coils may react to the non-contact power receiving apparatus 200 of one identification information instead of one minimum coil. For example, in the example of FIG. 1, it is assumed that the non-contact power receiving apparatus 200b can confirm the reception level at the positions (a) and (c) of FIG. In this case, the processing time can be shortened by selecting the minimum coil whose reception level can be preferentially confirmed during the next coil shape confirmation process for determining the size of the coil.
S2107: With respect to the minimum coil of the XY position of each non-contact power receiving apparatus 200, power is transmitted with the coil shape equivalently changed by the adjustment process. Specifically, FIGS. 12 (a), (b), (c), (d), (e) and FIGS. 13 (a), (b) are sequentially performed. Further, as described above, a configuration in which three minimum coils are selected may be performed.
S2116: When the non-contact power receiving apparatus 200 is activated with the shape of the coil that is transmitting at that time, the power receiving level is detected by the level detecting unit 205.
S2117: Identification information of the detected power reception level and the non-contact power receiving apparatus, that is, in the example of FIG. 1, a signal identifying the non-contact power receiving apparatus 200a or 200b is used as power reception information, and the wireless unit 207 performs communication antennas under the control of the control unit 206. It is transmitted from 208.
S2108: The power reception information from the non-contact power receiving apparatus 200 is confirmed. Alternatively, if the non-contact power receiving apparatus does not start with the shape of the coil that is transmitting at that time, the reception information does not come, so the time-out occurs for a certain time and the process proceeds to the next process S2109.
S2109: FIGS. 12 (a), (b), (c), (d), (e) and FIGS. 13 (a), (b), and three minimum coils as described above. Determine whether all configurations have been confirmed.
S2110: When all the confirmations are not completed, the next coil shape is selected, and the process returns to S2107.
S2111: When all the confirmations are completed, confirm the power reception identification information and the power reception level or timeout in each coil shape, compare the reception level for each identification information of the non-contact power reception device 200, and the coil having a high power reception level. The contactless power receiving device 200 whose shape is indicated by the identification information is determined to be the optimum coil shape for the Z position.
S2112: The coil shape by an optimal coil is set to the XYZ position of each non-contact power receiving apparatus 200.
S2113: Power transmission is started from the non-contact power transmission apparatus 100.
S2118: The non-contact power receiving apparatus 200 starts receiving power.

  Through the above processing, the non-contact power receiving apparatus 200 can receive power at the maximum power receiving efficiency with respect to the XYZ position where the user is present.

  FIG. 18A shows an example in which the number of minimum coils is increased, and shows a 4 × 4 example. Further, the number may be increased. As the number of minimum coils increases, the time until the XY position from S2102 to S2106 in the processing flow of FIG. 17 is confirmed becomes longer. In order to solve this problem, a cell in which several minimum coils are combined is used as one unit for XY position detection. FIG. 18B shows an example in which four 2 × 2 minimum coils subjected to adjustment processing are used as basic cells as one unit for detecting the XY position.

If the basic cell is used, in the example of FIG.
[1,1] [2,1] [1,2] [2,2]
[2,1] [3,1] [2,2] [3,2]
[3, 1] [4, 1] [3, 2] [4, 2]
[1,2] [2,2] [1,3] [2,3]
[2,2] [3,2] [2,3] [3,3]
[3,2] [4,2] [3,3] [4,3]
[1,3] [2,3] [1,4] [2,4]
[2,3] [3,3] [2,4] [3,4]
[3, 3] [4, 3] [3,4] [4, 4]
First, XY position detection is performed in the nine ways.

FIG. 19 shows a control flow for shortening the XY position detection time when the basic cell shown in FIG. 18B is used. In FIG.
S2401: Start S2402: Power transmission for confirming the optimum XY position is performed in the basic cell.
S2413: When the non-contact power receiving apparatus 200 is in the XY position that is activated by the basic cell that is transmitting power at that time, the level detecting unit 205 detects the power reception level.
S2414: Detected power reception level and contactless power receiving device identification information, that is, in the example of FIG. 1, a signal identifying the contactless power receiving device 200a or 200b is used as power receiving information by the control unit 206 to control the communication antenna. It is transmitted from 208.
S2403: The power receiving information from the non-contact power receiving apparatus 200 is confirmed. Alternatively, when there is no contactless power receiving device 200 at the XY position that is activated by the minimum coil that transmits power at that time, no reception information is received, and therefore time-out occurs after a certain period of time, and the process proceeds to the next process S2404.
S2404: It is determined whether all the combinations of the basic cells described above have been confirmed. S2405: If all the confirmations are not completed, the next basic cell is selected, and the process returns to S2402.
S2406: When all the confirmations are completed, the power reception identification information and the power reception level or time-out at each basic cell position are confirmed, and the reception level for each identification information of the non-contact power reception apparatus 200 is compared. It is determined that the non-contact power receiving apparatus 200 indicated by the identification information exists at the position of the large basic cell.
S2407: The smallest coil is selected and transmitted to the basic cell at the XY position of each non-contact power receiving apparatus 200. In the example of FIG. 18B, there are four minimum coils.
S2415: When the non-contact power receiving apparatus 200 is in the XY position where the non-contact power receiving apparatus 200 is activated by the minimum coil that transmits power at that time, the level detecting unit 205 detects the power reception level.
S2416: Identification information of the detected power reception level and the non-contact power receiving apparatus, that is, in the example of FIG. 1, a signal for identifying the non-contact power receiving apparatus 200a or 200b is used as power reception information by the control unit 206 to control the communication antenna. It is transmitted from 208.
S2408: The power receiving information from the non-contact power receiving apparatus 200 is confirmed. Alternatively, if the non-contact power receiving apparatus 200 is not in the XY position that is activated by the minimum coil that transmits power at that time, no reception information is received, and thus time-out occurs for a certain time and the process proceeds to the next step S2409.
S2409: It is determined whether all the minimum coils have been confirmed. In the example of FIG. 18B, there are four minimum coils.
S2410: If all the confirmations have not been completed, select the next minimum coil, and return to S2407.
S2411: When all the confirmations are completed, the power reception identification information and the power reception level or time-out at each minimum coil position are confirmed, the reception levels for each identification information of the non-contact power reception device 200 are compared, and the power reception level It is determined that the non-contact power receiving apparatus 200 indicated by the identification information is present at the position of the large minimum coil. In addition, there is a possibility that a plurality of minimum coils may react to the non-contact power receiving apparatus 200 of one identification information instead of one minimum coil. For example, in the example of FIG. 1, it is assumed that the non-contact power receiving apparatus 200b can confirm the reception level at the positions (a) and (c) of FIG. In this case, the processing time can be shortened by selecting the minimum coil whose reception level can be preferentially confirmed in the next processing for determining the size of the coil.
S2412: The processes from S2107 to S2111 in FIG. 17 are performed.

  Hereinafter, it is the same as FIG.

  The control flow of FIG. 19 has an effect that the XY position detection time can be shortened even when the number of minimum coils increases.

  FIG. 20 is a configuration block diagram of the non-contact power transmission device of the wireless power feeding system in the present embodiment.

  1 differs from FIG. 1 in that it has a position sensor (not shown) for detecting the XY position of the non-contact power receiving apparatus 200, and from this, the XY position detector 2501 detects the XY position of the non-contact power receiving apparatus 200, A function of outputting the XY position to the control unit 102 is provided.

FIG. 21 shows a control flow in the case of FIG. The same functions as those in FIG. 19 are denoted by the same reference numerals, and the description thereof is omitted. In FIG.
S2601: Start S2602: The XY position of the non-contact power receiving apparatus 200 is confirmed by information from the XY position detection unit 2501.
Hereinafter, it is the same as FIG.

  According to the present embodiment, there is an effect that the control flow is simplified.

  FIG. 22 is a configuration block diagram of a non-contact power transmission device of the wireless power feeding system in the present embodiment, and FIG. 23 is a configuration block diagram of the non-contact power reception device in the present embodiment.

  The difference from FIGS. 1 and 2 is that the load modulation unit 2801 is used to transmit the power reception level information detected by the level detection unit 205 of the non-contact power reception device 200, and the non-contact power transmission device 100 is a detection unit 2701. Receiving power reception level information.

  FIG. 24 shows an example of a circuit of the load modulation unit 2801. In FIG. 24, the power receiving coil 201 and the capacitor 2901 are connected to the drain of the FET 2902, and the source of the FET 2902 is connected to the ground. The gate of the FET 2902 is controlled by the control unit 206, and the FET 2902 is turned ON / OFF according to the reception level information. As a result, the load on the power receiving side is changed, the matching is lost, and transmission power is reflected. The detection unit 2701 detects this reflection via the power transmission coil 101 of the non-contact power transmission apparatus 100.

  FIG. 25 shows a detailed block diagram of the detection unit 2701. The same reference numerals as those in FIG. 16 indicate the same functions. In FIG. 25, detection circuits 3001a, 3001b, 3001c, and 3001d are connected to connecting portions of the output unit 2000a and the minimum coil 301, the output unit 2000b and the minimum coil 302, the output unit 2000c and the minimum coil 303, and the output unit 2000d and the minimum coil 304, respectively. Provided, and outputs the respective detection outputs to the control unit 102.

  FIG. 26 shows an example of the circuit of the detection circuit 3001. In FIG. 26, capacitors 3101 and 3104, diodes 3102 and 3103, and a resistor 3105 constitute a so-called voltage doubler detection circuit. As a result, it is possible to detect transmission power disturbance due to reflection caused by load modulation.

  The control flow of the non-contact power transmission apparatus 100 in FIG. 22 and the non-contact power reception apparatus 200 in FIG. 23 is the same as that in FIGS. The detection output of the detection circuit 3001 is the one connected to the minimum coil selected at that time. When a plurality of detection outputs are selected in the adjustment process, the detection outputs connected to the plurality of minimum coils are analog-added. Detection output.

  Even when there are a plurality of non-contact power receiving apparatuses 200, the combination of the minimum coils subjected to the adjustment processing corresponding to each of them is selected, so that it is possible to detect reflection of load modulation in each.

  According to the present embodiment, since the wireless units 105 and 207 and the communication antennas 104 and 208 are not necessary, there is an effect that the cost can be reduced as compared with the first embodiment shown in FIGS.

  FIG. 27 is a block diagram showing the configuration of the non-contact power receiving apparatus according to the present embodiment used in combination with the non-contact power transmitting apparatus of FIG. The difference from FIG. 23 is that the level detection unit 205 is deleted and the received power level is not transmitted to the non-contact power transmission apparatus 100 by load modulation, but a unique word generated by the control unit 3201, for example, “0” such as “10100110” In other words, the polarity can be determined when “1” is inverted, and the like is generated, and the load modulation unit 2801 performs load modulation.

  The non-contact power transmission apparatus 100 in FIG. 22 checks the detection output of the detection unit 2701 and confirms the polarity and detection output level with the control unit 102. When the detection output level is the maximum, it can be seen that the critical coupling shown in FIG. 6B is obtained, and the position can be specified by checking the degree of load modulation.

  FIG. 28 is a processing flow when the non-contact power transmitting apparatus 100 of FIG. 22 and the non-contact power receiving apparatus 200 of FIG. 27 are used. The same reference numerals as those in FIG. 17 denote the same processes.

  28 differs from FIG. 17 in that what is transmitted as power reception information in step S2115 or step S2117 is not a power reception identification signal and a power reception level but a power reception identification signal and a unique word. Correspondingly, in step S3301 or step S3302, the XY position and the coil shape are determined based on the detection output level and detection output polarity of the detection output of the detection unit 2701.

  It is obvious that the present invention can also be applied to the control flow of FIG.

  According to the present embodiment, the level detection unit 205 is not necessary in addition to the radio units 105 and 207 and the communication antennas 104 and 208, so that the cost is lower than that of the first embodiment in FIGS. 1 and 2 and the third embodiment in FIG. There is an effect that can.

FIG. 29 is a configuration block diagram of a non-contact power transmission device of the wireless power feeding system in the present embodiment. The difference from FIG. 1 is that the power transmission coil that can be adjusted is not limited to the XY plane (power transmission coil 101) of the box-shaped non-contact power transmission apparatus 100 but also the YZ plane (power transmission coil 3401) and ZX plane (power transmission coil 3402). And an output switching adjustment unit 103 on the XY plane, an output switching adjustment unit 3403 on the YZ plane, and an output switching adjustment unit 3404 on the ZX plane. The output switching adjustment unit 103 on the XY plane, the output switching adjustment unit 3403 on the YZ plane, and the output switching adjustment unit 3404 on the ZX plane have the same configuration.

FIG. 30 shows a control flow of the non-contact power transmission apparatus 100 of FIG. In FIG.
S3501: Start S3502: On the XY plane, the coil shape by the coil on the XY plane that is optimal for the XYZ position of each non-contact power receiving apparatus 200 is set. The control flow of FIG. 17 or FIG. 19 is used.
S3503: On the YZ plane, the coil shape by the coil on the XY plane that is optimal for the XYZ position of each non-contact power receiving apparatus 200 is set. The control flow of FIG. 17 or FIG. 19 is used.
S3504: On the YZ plane, the coil shape by the coil on the XY plane that is optimal for the XYZ position of each non-contact power receiving apparatus 200 is set. The control flow of FIG. 17 or FIG. 19 is used.

The order of the XY plane process, the YZ plane process, and the ZX plane process may be performed from any surface.
S3505: Value that maximizes the power reception unit power reception level by changing the output level and phase of the coil on the XY plane, the coil shape on the YZ plane, and the coil shape on the ZX plane. Set to.

  As shown in FIG. 16, the phase of the power transmission output can be changed by changing the output level of the power supply 2004 and the phases of the clocks 2010a, 2010b, 2010c, and 2010d.

  According to the present embodiment, vector transmission can be added to the transmission power from the XY plane, the YZ plane, and the ZX plane, so that the power can be received with the maximum power reception efficiency regardless of the orientation of the power reception coil of the non-contact power reception device 200. There is an effect that can be done.

  FIG. 31 shows an example in which the non-contact power transmission device of the wireless power feeding system in this embodiment is used in a space 3600 such as in a building. At this time, the XY plane, the YZ plane, and the ZX plane are used on both sides, and the XY plane power transmission coils 101 and 3601, the YZ plane power transmission coils 3401 and 3602, and the ZX plane power transmission coils 3402 and 3603 are used.

  The control flow is basically the same as that in FIG. 30, but the process of whether to use one of the two-sided planes or vector synthesis using both sides is added.

  According to the present embodiment, since both the XY plane, the YZ plane, and the ZX plane are used, there is an effect that it can cope with a wide space. Also, even in a wide space, the smallest coil is used, so the coil design can be made with low copper loss and high sensitivity, and the resonant frequency design for power transmission can be performed only by designing the smallest coil. The coil design is highly sensitive and has a high tolerance for setting the transmission frequency.

  FIG. 33 is a configuration block diagram of an embodiment in which a coil for adjustment processing is used on the non-contact power reception device side, and FIG. 32 is a configuration block diagram of the non-contact power transmission device that transmits power to the non-contact power reception device in FIG.

  In FIG. 32, the non-contact power transmission apparatus 3700 has a power transmission coil 3701 incorporated in a cradle 3702 and power is transmitted using an output unit 3703.

  In FIG. 33, the non-contact power receiving device 3800 receives power using, for example, the power receiving coil 3801 that can be adjusted in the configuration of FIG. 3, matches each minimum coil with the matching unit 3804, and rectifies with the rectifying unit 3802. The direct current is stabilized by the converter 3803 and the battery 204 is charged. The level detection unit 3805 detects the power reception level from the output of the rectification unit 3802 and outputs reception level information to the control unit 3806. The control unit 3806 adjusts the matching of the matching unit 3804 using the reception level information. Identification information of the non-contact power receiving device 3800 is transmitted from the wireless unit 207 and the communication antenna 208.

  FIG. 34 shows a detailed configuration of the matching unit 3804 and the rectifying unit 3802. In FIG. 34, a matching unit 3804 and a rectifying unit 3802 are configured by matching circuits 3918a, 3918b, 3918c, 3918d and rectifying circuits 3919a, 3919b, 3919c, 3919d connected to the minimum coils 301, 302, 303, 304, respectively. Is done. The matching circuits 3918a, 3918b, 3918c, and 3918d are the same circuit, and the rectifier circuits 3919a, 3919b, 3919c, and 3919d are the same circuit. The matching circuit 3918a and the rectifier circuit 3919a will be described internally.

  The matching circuit 3918a is a so-called π-type matching circuit composed of inductors 3905 and 3906, and capacitors 3907 and 3908. The matching circuit 3918a is connected to the drain of the FET 3902 via one of the minimum coils 301 and the capacitor 3901 at the preceding stage. The other end of the minimum coil 301 and the drain of the FET 3904 are connected via the capacitor 3903, and the source of the FET 3904 is connected to the ground. The gates of the FETs 3902 and 3904 are controlled by the control unit 3806, and the FETs 3902 and 3904 are turned ON / OFF. Thus, when the minimum coil 301 is selected, the FETs 3902 and 3904 are turned off, and when not selected, the FETs 3902 and 3904 are turned on to shift from the matching state. The constants of the π-type matching circuit composed of the inductors 3905 and 3906 and the capacitors 3907 and 3908 are adjusted by the matching circuits 3918a, 3918b, 3918c, and 3918d to absorb the element variation and the like, and the minimum coils 301, 302, and 303 are absorbed. , 304 are adjusted so as to be adjusted. Further, the FETs 3902 and 3904 may be used in a variable resistance manner to finely adjust the current.

  The rectifier circuit 3919a rectifies a full-wave rectifier circuit composed of diodes 3909, 3910, 3911, and 3912, and smoothes it with a capacitor 3913 to obtain a direct current. The power reception levels of the rectifier circuits 3919a, 3919b, 3919c, and 3919d are separated by the diodes 3914, 3915, 3916, and 3917, and the respective power reception levels are detected by the level detection unit 3805 and output to the control unit 3806. The outputs of the diodes 3914, 3915, 3916, and 3917 are combined and stabilized by the converter 3803 to charge the battery 204.

FIG. 35 shows a control flow of the non-contact power transmission device 3700 of FIG. 32 and the non-contact power reception device 3800 of FIG. In FIG.
S4001: Start S4002: Perform initial power transmission.
S4005: One of the minimum coils 301, 302, 303, 304 receives power for confirming the optimum XY position and starts.
S4006: The level detection unit 3805 detects the power receiving level of the minimum coil that the power receiving coil 3801 of the non-contact power receiving device 3800 is receiving at that time.
S4007: It is determined whether all the minimum coils 301, 302, 303, and 304 have been confirmed. (A), (b), (c), and (d) shown in FIG.
S4008: If all the confirmations have not been completed, select the next minimum coil, and return to S4005.
S4009: When all the confirmations are completed, the power reception level at the position of each minimum coil is confirmed. It is determined that the power transmission coil 3701 of the non-contact power transmission device 3700 is at the position of the minimum coil having a large power reception level. There is a possibility that the power reception level of a plurality of minimum coils is large instead of one minimum coil. In this case, the processing time can be shortened by selecting the minimum coil whose reception level can be preferentially confirmed during the next coil shape confirmation process for determining the size of the coil.
S4010: With respect to the minimum coil at the XY position of the power transmission coil 3701 of the non-contact power transmission device 3700, the coil shape is equivalently changed by the adjustment process to receive power. Specifically, FIGS. 12 (a), (b), (c), (d), (e) and FIGS. 13 (a), (b) are sequentially performed. Further, as described above, a configuration in which three minimum coils are selected may be performed.
S4011: The level detection unit 3805 detects the power reception level.
S4012: FIG. 12 (a), (b), (c), (d), (e), FIG. 13 (a), (b), and three minimum coils as described above. Determine whether all configurations have been confirmed.
S4013: If all the checks have not been completed, select the next coil shape and return to S4010.
S4014: When all the confirmations are completed, the power reception levels in the respective coil shapes are compared, and the coil shape having a high power reception level is determined to be the optimum coil shape for the Z position where the power transmission coil 3701 of the non-contact power transmission device 3700 is located. To do.
S4015: The coil shape by the optimal coil is set to the XYZ position of the non-contact power transmission apparatus 3700.
S4016: The wireless unit 207 is controlled by the control unit 3806 using the identification information of the non-contact power receiving apparatus 3800 as power reception information, and is transmitted from the communication antenna 208.
S4003: The power receiving information from the non-contact power receiving device 3800 is confirmed.
S4004: Power transmission is started from the non-contact power transmission device 3700.
S4017: Non-contact power receiving apparatus 3800 starts receiving power.

  Through the above processing, the non-contact power receiving device 3800 can receive power at the maximum power receiving efficiency with respect to the XYZ position where the power transmission coil 3701 of the non-contact power transmitting device 3700 is present.

  FIG. 36 shows an example in which the non-contact power receiving device 3800 of the wireless power feeding system in this embodiment is used for wireless power feeding of the electric vehicle 4100.

  The power receiving coil 3801 of the non-contact power receiving device 3800 is arranged in a wide area on the bottom surface of the electric vehicle 4100. Since the vehicle height of the electric vehicle 4100 differs depending on the vehicle type, the distance between the power receiving coil 3801 on the bottom surface of the electric vehicle and the power transmission antenna 3701 of the non-contact power transmission device 3700 is not constant.

  By applying the non-contact power receiving device 3800 to the electric vehicle 4100, it is possible to receive power with the highest power receiving efficiency even when there is a difference in the vehicle height in the Z-axis direction as well as the XY plane displacement due to the stop position of the electric vehicle 4100. effective.

  DESCRIPTION OF SYMBOLS 100 ... Non-contact power transmission apparatus, 101 ... Power transmission coil, 102 ... Control part, 103 ... Output switching adjustment part, 104 ... Communication antenna, 105 ... Radio | wireless part, 200 ... Non-contact power reception apparatus, 201 ... Power reception coil, 202 ... Rectification part , 203 ... converter, 204 ... battery, 205 ... level detection unit, 206 ... control unit, 207 ... radio unit, 208 ... communication antenna, 301, 302, 303, 304 ... minimum coil, 2000a, 2000b, 2000c, 2000d ... output 2501, XY position detection unit, 2701 ... detection unit, 2801 ... load modulation unit, 3001a, 3001b, 3001c, 3001d ... detection circuit, 3201 ... control unit, 3401, 3402 ... power transmission coil, 3403, 3404 ... output switching adjustment Part, 3600 ... space, 3700 ... non-contact power transmission device, 3701 ... power transmission carp 3702 ... Stand, 3703 ... Output unit, 3800 ... Non-contact power receiving device, 3801 ... Receiving coil, 3802 ... Rectifying unit, 3803 ... Converter, 3804 ... Alignment unit, 3805 ... Level detection unit, 3806 ... Control unit, 3918a, 3918b, 3918c, 3918d ... matching circuit, 3919a, 3919b, 3919c, 3919d ... rectifier circuit, 4100 ... electric vehicle

Claims (8)

A non-contact power transmission device that has at least two power transmission coils on the same plane and feeds power from the power transmission coil to the non-contact power reception device via the power reception coil,
A first power transmission coil;
A second power transmission coil having a side adjacent to and opposed to the first power transmission coil;
An output adjustment unit that independently adjusts the current flowing through each of the first power transmission coil and the second power transmission coil;
By canceling the magnetic field generated by the adjacent and opposite sides of each of the first power transmission coil and the second power transmission coil, or by the electromotive force in the receiving coil caused by the magnetic field generated by each of the adjacent and opposite sides A control unit that controls the output adjustment unit so as to perform an adjustment process in which the generated currents cancel each other;
A non-contact power transmission device comprising: The first power transmission coil and the second power transmission coil have the same polygon shape,
2. The contactless power transmission device according to claim 1, wherein in the adjustment process, the currents flowing through the first power transmission coil and the second power transmission coil are set to have the same phase and the same magnitude. Having an information obtaining unit for obtaining received power amount information from the non-contact power receiving device;
A first state in which a current is supplied only to the first power transmission coil and switched to the output of the first power transmission coil, and a second state in which a current is supplied only to the second power transmission coil and switched to the output of the second power transmission coil. State and
The control unit obtains a positional relationship of the power receiving coil on the same plane from the received power amount information obtained from the information obtaining unit in the first state and the second state. The non-contact power transmission device according to claim 1 or 2.   The control unit is configured to output the first power transmission coil only, the second power transmission coil only, or the first power transmission in which the adjustment process is performed based on the positional relationship of the power reception coil on the same plane. The contactless power transmission device according to claim 3, wherein one of an output of the coil and the second power transmission coil is selected. A non-contact power receiving device that is fed from a non-contact power transmitting device having a power transmitting coil and has at least two power receiving coils on the same plane,
A first power receiving coil;
A second power receiving coil having a side adjacent to the first power receiving coil and facing the first power receiving coil;
An adjustment unit that independently adjusts the current flowing in each of the first power receiving coil and the second power receiving coil;
An adjustment process is performed in which the magnetic fields generated by the adjacent opposing sides of the first power receiving coil and the second power receiving coil are canceled, or the currents generated in the adjacent adjacent sides are canceled each other. A control unit for controlling the adjustment unit;
A non-contact power receiving device comprising: The first power receiving coil and the second power receiving coil have the same shape polygon,
The non-contact power receiving apparatus according to claim 5, wherein in the adjustment process, currents flowing through the first power receiving coil and the second power receiving coil are set to have the same phase and the same magnitude. The non-contact power receiving device includes a detection unit that detects received power amount information of the first power receiving coil and the second power receiving coil,
A first state in which a current is supplied only to the first power receiving coil and switched to the input of the first power receiving coil, and a second state in which a current is supplied only to the second power receiving coil and switched to the input of the second power receiving coil. And having a state of
The said control part calculates | requires the positional relationship on the said same plane of the said power transmission coil from the said received electric energy information detected by the said detection part in the said 1st state and the said 2nd state. The non-contact power receiving device according to 5 or 6.   The control unit is configured to input the first power receiving coil only, input the second power receiving coil only, or perform the adjustment process based on the positional relationship of the power transmitting coil on the same plane. The contactless power receiving device according to claim 7, wherein one of an input of a coil and the second power receiving coil is selected.

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