KR101517393B1 - Contactless power supplying system - Google Patents

Abstract

The position and posture of the water-discharging coil L3 are estimated according to the presence detection level of each of the power-supplying coils L1. In this position and posture, the power feeding pattern at which the output of the power reception device 30 becomes the maximum is selected, and the power feeding is performed with the power feeding pattern. Therefore, power can be supplied to the power reception device 30 with high efficiency regardless of the position and posture of the water-dedicated coil L3.

Description

{CONTACTLESS POWER SUPPLYING SYSTEM}

The present invention relates to a non-contact power supply system.

BACKGROUND ART [0002] Conventionally, there is a non-contact power feeding system that feeds power from a power feeding device to a power receiving device in a non-contact manner (see, for example, Japanese Patent Application Laid-Open No. 2003-204637). The power supply device supplies electric power to the power receiving device in a noncontact manner. The water receiving apparatus supplies electric power from the power feeding apparatus to the electric apparatus.

In recent years, in order to further improve the convenience of the user, there has been known a so-called free-layout method in which only a water receiving device is provided at an arbitrary position on the upper surface (feeding surface) layout type noncontact feeding system is being studied. In this system, it is not necessary to install the water receiving apparatus at a specially determined position if the water supply front face of the feeding apparatus.

In the system, a plurality of primary coils are arranged along the front surface of the feeder. The feed device generates magnetic flux by exciting the primary coil. By this magnetic flux, an electromotive force is generated in the secondary coil installed in the water receiving apparatus. Thereby, power is supplied from the power feeding device to the power receiving device (see, for example, Japanese Patent Application Laid-Open No. 2008-5573).

In addition, when the power supply starts, the power supply device performs presence detection for detecting the presence of the power reception device on the power supply front face and the position of the power reception device. Specifically, first, the power feeding device sequentially supplies current to each primary coil and also monitors the current of the primary coil at that time. If there is a water receiving device in the direction of the magnetic flux of the primary coil, the current flowing through the primary coil changes as the primary coil magnetically couples with the secondary coil. According to the change of the current, it is possible to detect which of the primary coils the power reception device is present around the primary coils. The power supply device supplies electric current to only the primary coil of the area where the water receiving device is determined to be present. As a result, unnecessary power supply to the primary coil in the area where the water receiving device is not present is suppressed.

In the non-contact power feeding system of the pre-layout type, current was supplied to all the primary coils in the region where the water receiving device is determined to exist. However, in practice, when current is supplied only to a part of the primary coils in the above-mentioned area, the output power of the power reception device increases and the power supply efficiency is improved There is a case. One of the factors is that the magnetic fluxes generated from the primary coils interfere with each other and cancel each other.

An object of the present invention is to provide a noncontact power feeding system capable of improving the power feeding efficiency by changing the power feeding pattern to the primary coil.

According to an aspect of the present invention, there is provided a non-contact power supply system including a power supply front surface and a plurality of power supply coils disposed along the power supply front surface, wherein each of the plurality of power supply coils includes: The power supply device generating an alternating magnetic flux by being supplied; And a power receiving device including a water-receiving coil for generating an electric power to be supplied to the load in accordance with the alternating magnetic flux when installed on the feeder surface, wherein the power feeding device comprises: A presence detector for detecting whether or not a water receiving device is present; A position / posture estimating unit for estimating a position and a posture of the water-receiving coil with respect to the feeding surface in accordance with the detection result of the presence detecting unit; A plurality of power supply patterns corresponding to positions and postures of the water-receiving coils of the water receiving apparatus on the feeder surface and a power value of the electric power generated by the water-receiving coils in each of the plurality of power feeding patterns A memory for storing a first table; And a feed controller for selecting a feed pattern having the highest feed efficiency according to the position and posture of the water-receiving coil estimated by the position / posture estimating section based on the first table and feeding the feed pattern with the feed pattern .

According to the present invention, in the non-contact power feeding system, the power feeding efficiency can be improved by changing the feeding pattern to the primary coil.

1 is a configuration diagram of a non-contact power feeding system.
2 is a perspective view of a non-contact power feeding system.
3 is a table stored in the memory in the first embodiment.
Fig. 4 is a schematic diagram showing the distribution of existence detection levels in each of the power supply coils L1 in the first embodiment.
5 is a schematic diagram showing the presence detection level calculated in the first embodiment and the presence detection level in the third installation pattern stored in the memory.
Fig. 6 is a table showing the upper diagram R in each installation pattern in the first embodiment. Fig.
7 is a flowchart executed by the common control circuit in the first embodiment.
Fig. 8 is a diagram showing the arrangement of (a) the water-specific coil L3 in the second embodiment, (b) a diagram showing the existence detection level of each of the power supply coils L1, FIG.
9 is a table stored in the memory in the third embodiment.
10 is a table stored in the memory in the fourth embodiment.
Fig. 11 is a diagram showing the shapes of the water-only coil L3 and the secondary-side authentication coil L4 in (a) to (d) in the fifth embodiment.
Fig. 12 is a diagram showing the presence detection level of each of the power supply coils L1, (b) and (c) showing the arrangement of the secondary side authentication coils L4, Fig.
13 is a table stored in the memory in the fifth embodiment.

(Embodiment 1)

Hereinafter, a first embodiment of the noncontact power feeding system of the present invention will be described with reference to Figs. 1 to 7. Fig.

As shown in Fig. 1, the non-contact power feeding system includes a power feeding device 10 and a power receiving device 30. [ In this example, the water receiving apparatus 30 is included in the portable terminal 40. [ Hereinafter, configurations of the power supply device 10 and the water receiving device 30 will be described.

(Power supply device)

As shown in Fig. 2, the power feeding device 10 is covered with a flat-plate-like housing 2. Fig. On the upper surface of the housing 2, a feed surface 6 on which the portable terminal 40 is mounted is formed.

As shown by the broken line in Fig. 2, 36 sets of coil groups are provided in the housing 2 in total over the entire surface of the feeder 6. The set of coils includes a power supply coil L1 and a primary side authentication coil L2. The group of coils is arranged in the form of a matrix of 6 rows x 6 columns on the fastening surface 6.

1, the power feeding device 10 includes a single common unit 11 and a plurality (36 in this example) of the power supply units 15 connected to the common unit 11. [

The common unit 11 includes a power supply circuit 13, a common control circuit 12, and a nonvolatile memory 14.

The power supply circuit 13 converts the power from the external power supply to an appropriate DC voltage and supplies the DC voltage to each power supply unit 15 and the common unit 11 as operating power.

The common control circuit 12 is constituted by a microcomputer and also collectively controls each of the power supply units 15. [

The power supply unit 15 includes an excitation drive circuit 16, a voltage detection circuit 17, and a primary side authentication circuit 18. [ The power supply coil L1 is connected to the excitation drive circuit 16 and the primary side authentication coil L2 is connected to the primary side authentication circuit 18. [

The voltage detection circuit 17 is connected to the power supply coil L1. The voltage detection circuit 17 detects the voltage of the power supply coil L1 and outputs the detection result to the common control circuit 12. [

The common control circuit 12 controls the operation of the excitation drive circuit 16 through the output of the command signal. Upon receiving the command signal, the excitation drive circuit 16 generates a high frequency current (alternating current), and supplies the generated current to the power supply coil L1. Thereby, the power supply coil L1 is excited.

The common control circuit 12 supplies a high frequency current to each of the power supply coils L1 in order and determines whether or not an object exists around the power supply coil L1 in accordance with the detection result of the voltage detection circuit 17 at that time The presence detection is performed. The supply time of the high frequency current to each of the power supply coils L1 in the presence detection is set to be short enough such that the temperature rise of the object in the power supply front surface 6 accompanying the excitation of the power supply coil L1 is hardly detected do. This presence detection will be described in detail next. The common control circuit 12 and the voltage detection circuit 17 constitute a presence detection unit.

The common control circuit 12 generates an ID request signal when it is determined that an object exists around the power supply coil L1 and outputs the generated signal to the primary side authentication circuit 18. [ The primary side authentication circuit 18 modulates the ID request signal and wirelessly transmits the modulated signal via the primary side authentication coil L2.

The primary side authentication coil L2 receives the ID signal from the power reception device 30 using electromagnetic induction and outputs the received signal to the primary side authentication circuit 18. [ The primary side authentication circuit 18 demodulates the ID signal and outputs the demodulated signal to the common control circuit 12. The common control circuit 12 collates the ID code included in the ID signal with the ID code stored in the memory 14. [ When it is determined that the verification of the ID code is established, the common control circuit 12 determines that the object is the regular power reception device 30 and executes the power supply.

In the memory 14, a table shown in Fig. 3 and an ID code unique to the previously-registered power reception apparatus 30 are stored. This table shows the presence detection level of each of the power supply coils L1 in the first to third installation patterns in which the position and posture of the water-dedicated coil L3 are different from each other, The output power of the water receiving apparatus 30 at the time of power feeding is shown. Then, the common control circuit 12 constitutes a position / posture estimation unit and a power supply control unit.

Hereinafter, the presence detection will be described in detail.

The common control circuit 12 determines whether or not an object (the water-bearing coil L3) is present around the power supply coil L1 and the position and attitude of the object in accordance with the detection result of the voltage detection circuit 17 . Here, when an object exists in the vicinity of the power supply coil L1, the excited power supply coil L1 is magnetically coupled with the object, and the impedance in the power supply coil L1 increases. Therefore, the voltage of the power supply coil L1 is lowered. The voltage of the power supply coil L1 becomes a value corresponding to the degree of magnetic coupling between the power supply coil L3 and the power supply coil L1 when the power reception device 30 is provided as an object. The common control circuit 12 calculates the degree of magnetic coupling of the water-receiving coil L3 with respect to the power supply coil L1 as an existence detection level in accordance with the detection result of the voltage detection circuit 17. [ This presence detection level is expressed in real numbers. Fig. 4 shows the distribution of existence detection levels for each of the power supply coils L1. In Fig. 4, the presence detection level is "0.0" for the power supply coil L1 having no numeric display. This is also true of other drawings.

When the water-supplying coil L3 is not superimposed on the power supply coil L1 at all, the existence detection level is calculated as "0.0" since both coils L1 and L3 do not magnetically couple. When the water-receiving coil L3 is overlaid over the entire power-supplying coil L1, the degree of magnetic coupling between the two coils L1 and L3 becomes maximum and the present detecting level is calculated as "1.0" .

The common control circuit 12 calculates the presence detection level for each of the power supply coils L1 when the presence detection is performed. The common control circuit 12 estimates the position and attitude of the water-standing coil L3 according to the comparison between the calculated existence detection level and the existence detection levels of the first to third installation patterns stored in the memory 14 .

As shown in the left side of Fig. 3, the first to third installation patterns are the positions and attitudes of the water-receiving coil L3 relative to the nine power-supply coils L1 in total of "3 rows x 3 columns". In this example, both the power supply coil L1 and the water-supplying coil L3 are formed in a square shape, and the water-supplying coil L3 is formed larger than the power supply coil L1. The number of the power supply coils L1 facing one water-supplying coil L3 also changes when the magnitude relationship between the water-supplying coil L3 and the power-supplying coil L1 is changed.

In the first installation pattern, the water-supplying coil L3 is located at the center of "3 rows x 3 rows" corresponding to the power supply coil L1 located at the center of the water- In the second installation pattern, the water-supplying coil L3 is arranged so that the upper side of the water-supplying coil L3 is in contact with the upper side of the power supply coil L1 at the center, And is provided so as to house the dedicated coil L1 in its center. In the third installation pattern, the water-dedicated coil L3 is installed at a position rotated from the first installation pattern by 45 degrees with the coil axis as the center of rotation.

Next, a method of estimating the position and posture of the water-discharging coil L3 according to the plurality of existence detection levels calculated will be described.

As shown in Fig. 4, first, the common control circuit 12 selects the largest presence detection level among the plurality of existence detection levels. In this example, "0.9 ", which is the maximum detection level, is selected. Then, the common control circuit 12 selects the power supply coil L1 of the selected presence detection level and the eight power supply coils L1 surrounding the selected power supply detection coil L1. That is, "3 rows x 3 columns" centered on the power supply coil L1 at which the presence detection level becomes the maximum is selected.

The upper limit R of the existence detection levels of the selected power supply coils L1 and the presence detection levels in the first to third installation patterns stored in the memory 14 is calculated from the following formula .

In the above equation (1), "I" is the presence detection level of the calculated power supply coil L1, and "T" is the presence detection level stored in the memory 14. I is a row, and j is a column. As shown in Fig. 5, the columns indicate the positions in the left and right directions in the elements of the matrix, and the rows indicate the positions in the vertical direction in the elements of the matrix.

In the case of calculating the upper degree R, first, the absolute value of the value obtained by subtracting T (0, 0) from I (0, 0) is obtained. Next, an absolute value of a value obtained by subtracting T (0, 1) from I (0, 1) is obtained. The absolute value obtained by performing this operation all nine times is added. In this way, a higher degree R is derived. It is estimated that the water-only coil L3 is provided in a position and posture approximate to the installation pattern as the upper degree R is smaller. Here, as shown in the above equation (1), the higher degree R is calculated as the sum of absolute differences (SAD), but the sum of squared differences (SSD) . It is also possible to calculate the normalized cross-correlation (NCC) as the degree of similarity instead of the higher degree, and to assume that the water-supplying coil L3 is provided at the position and attitude at which the degree of similarity becomes maximum.

The common control circuit 12 calculates the upper diagram R for the first to third installation patterns as shown in Fig. In this example, the upper diagram R in the first installation pattern is "0.4", the upper diagram R in the second installation pattern is "1.5", the upper diagram R in the third installation pattern is "1.2 ". The common control circuit 12 estimates that the position and posture of the water-receiving coil L3 is close to the first installation pattern corresponding to the smallest upper diagram R among the three higher diagrams R. [

The common control circuit 12 feeds power in a power supply pattern in which the output power of the power reception device 30 becomes the maximum among the first to fifth power supply patterns in accordance with the estimation result of the position and attitude of the water- . The power feeding efficiency becomes maximum when the output of the water receiving apparatus 30 becomes the maximum. The power supply efficiency is calculated according to the amount of electricity received per a certain time.

As shown in the right side of Fig. 3, the first feeding pattern is a pattern that feeds power only to the center power supply coil L1 in "3 rows x 3 columns". The second feeding pattern is a pattern that feeds power to the power supply coil L1 at the center and the power supply coil L1 at the bottom in "3 rows × 3 columns". The third feeding pattern is a pattern that feeds power to the center power supply coil L1 in the "3 rows × 3 columns" and the power supply coils L1 on the lower and right sides thereof. The fourth feeding pattern is a pattern in which a total of five power supply coils L1 are fed in a cross shape centering on the power supply coil L1 at the center in "3 rows × 3 columns". The fifth feeding pattern is a pattern that feeds all the nine power supply coils L1 in "3 rows × 3 columns". In any of the power feeding patterns, the power supplied to each of the power supplying coils L1 is the same.

When the water supply coil L3 is provided as the first installation pattern, the output of the power reception device 30 becomes maximum at 15 W when power is supplied to the fourth feeding pattern. Therefore, when it is assumed that the installation and posture of the water-discharging coil L3 are close to the first installation pattern, the common control circuit 12 feeds the fourth feeding pattern.

When the water-supplying coil L3 is provided as the second installation pattern, the output of the power reception device 30 becomes maximum at 12 W when power is supplied to the second power supply pattern. Therefore, when the position and posture of the water-discharging coil L3 is estimated to be close to the second installation pattern, the common control circuit 12 feeds power to the second feeding pattern.

When the water supply coil L3 is provided as the third installation pattern, the output of the power reception device 30 becomes maximum at 10 W when power is supplied to the first power supply pattern. Therefore, when it is assumed that the position and posture of the water-discharging coil L3 is close to the third installation pattern, the common control circuit 12 feeds power to the first feeding pattern.

The existence detection level in each installation pattern stored in the memory 14 is obtained experimentally. Similarly, the output power in each of the power feeding patterns stored in the memory 14 is obtained experimentally. In this experiment, power is actually supplied to the first to fifth feeding patterns in a state in which the water-receiving coil L3 is provided in each installation pattern. The output power of the water receiving apparatus 30 at this time is stored.

(Water receiving device)

1, the power reception device 30 includes a rectifier circuit 31, a secondary side authentication circuit 32, a secondary side control circuit 33, a memory 34, and a DC / DC converter 35 Respectively. A water supply coil L3 is connected to the rectifying circuit 31 and a secondary side authentication coil L4 is connected to the secondary side authentication circuit 32. [

The water-receiving coil L3 outputs the electric power induced by the magnetic flux from the power supply coil L1 to the rectifying circuit 31. [ The rectifying circuit 31 rectifies AC power induced in the water-receiving coil L3. The DC / DC converter 35 converts the DC voltage from the rectifying circuit 31 to a value suitable for the operation of the portable terminal 40. [ This DC voltage is used, for example, for charging a secondary battery (not shown), which is an operation power source of the portable terminal 40.

The secondary side control circuit 33 is constituted by a microcomputer and operates by receiving a part of the electric power from the rectifying circuit 31. [ In the memory 34, an ID code unique to the power reception device 30 is stored.

When the secondary side authentication coil L4 receives the ID request signal from the primary side authentication coil L2 using electromagnetic induction, the secondary side authentication coil L4 outputs the received signal to the secondary side authentication circuit 32. [ The secondary side authentication circuit 32 demodulates the ID request signal and outputs the demodulated signal to the secondary side control circuit 33. When the secondary side control circuit 33 recognizes the ID request signal, the secondary side control circuit 33 generates an ID signal including the ID code stored in the memory 34, and outputs the generated signal to the secondary side authentication circuit 32. The secondary side authentication circuit 32 modulates the ID signal and wirelessly transmits the modulated signal via the secondary side authentication coil L4.

Next, the processing procedure of the common control circuit 12 will be described with reference to the flowchart of Fig. The flowchart is executed whenever a predetermined period elapses.

First, the common control circuit 12 performs presence detection by sequentially supplying current to each of the power supply coils L1 (S101), and determines whether or not an object exists (S102). When the common control circuit 12 has not detected the presence of an object (NO in S102), the processing is terminated.

When the presence of an object is detected (YES in S102), the common control circuit 12 transmits an ID request signal (S103). The common control circuit 12 collates the ID code included in the received ID signal with the ID code stored in the memory 14 of itself (S 104). When the common control circuit 12 determines that the verification of the ID code is not established (NO in S104), the common control circuit 12 ends the process. Thereby, it is prevented that power is supplied to the power receiving apparatus other than the regular power receiving apparatus 30. When it is determined that the ID code is verified (YES in S104), the common control circuit 12 determines the position of the water-sealed coil L3 based on the position and posture of the water-receiving coil L3 estimated through the calculation and comparison of the upper diagram R, And selects a power supply pattern at which the output power of the power reception device 30 becomes the maximum (S 105). Then, the common control circuit 12 starts supplying power to the power supply coil L1 with the selected power feeding pattern (S 106). Thus, the processing of the common control circuit 12 ends.

According to the first embodiment described above, the following effects can be obtained.

(1) The position and posture of the water-discharging coil L3 are estimated according to the existence detection level of each of the power-supplying coils L1. Then, in this position and posture, a power feeding pattern that maximizes the output of the power reception device 30 is selected, and the power feeding is performed with the power feeding pattern. Therefore, power can be supplied to the power reception device 30 with high efficiency regardless of the position and posture of the water-only coil L3.

(2) Through the comparison of the calculated upper diagram R, the installation pattern of the water-only coil L3 is estimated. Therefore, an installation pattern close to the actual position and posture of the water-standing coil L3 can be estimated by a simple process.

(Second Embodiment)

Hereinafter, a second embodiment of a non-contact power supply system according to the present invention will be described with reference to FIG. The noncontact power feeding system of the second embodiment differs from the first embodiment in that power can be supplied with a suitable power feeding pattern even when a plurality of water-receiving coils L3 are provided adjacent to each other. Hereinafter, differences from the first embodiment will be mainly described. The noncontact feeding system of the second embodiment has substantially the same configuration as the noncontact feeding system of the first embodiment shown in Fig.

The common control circuit 12 determines the presence detection level of each of the power supply coils L1 and determines the number of the power supply coils L1 in which the presence detection level among all the power supply coils L1 is equal to or greater than the threshold value T1 It is judged whether or not it exceeds a threshold value. This threshold value T1 can detect the presence of the water-dedicated coil L3 and can be arbitrarily set to be larger than the noise level, and is set to, for example, T1 = 0.1.

In consideration of the size of the water-receiving coil L3 of this example, when one water-supplying coil L3 is provided on the feeder surface 6, the power supply coil L3 whose existence detection level is equal to or greater than the threshold value T1 (L1) is assumed to be a maximum of nine. Therefore, the threshold value is set to 10, for example. That is, this threshold value is set to increase as the size of the water-only coil L3 increases.

When the common control circuit 12 detects that the number of the power supply coils L1 whose existence detection level is equal to or greater than the threshold value T1 among all the power supply coils L1 is less than the threshold value, L3 are provided on the feeder surface 6 and the posture and position of the water-receiving coil L3 are estimated through the same process as in the first embodiment, The power is supplied in a pattern.

As shown in Fig. 8A, a case where two water-standing coils L3 are provided adjacent to each other in different attitudes will be described. In this case, as shown in Fig. 8 (b), the common control circuit 12 determines that the number of the power supply coils L1 whose existence detection level is equal to or greater than the threshold value T1 among all the power supply coils L1 Value or more. Then, the common control circuit 12 selects the upper two power supply coils L1 having the high presence detection levels among the existence detection levels. That is, as shown in Fig. 8 (c), the power supply coil L1 having the existence detection level of "1.0" and the power supply coil L1 having the existence detection level of "0.9" are selected. Then, the common control circuit 12 selects "3 rows x 3 columns" (first region A1) around the power supply coil L1 whose presence detection level is "1.0" Quot; 3 rows x 3 columns "(second area A2) centered on the power supply coil L1 whose level is" 0.9 ". At this time, the existence detection level of the portion where the first area A1 and the second area A2 overlap each other is set to be a distance between the two power supply coils L1 that are the centers of the respective areas A1 and A2 . In this example, the presence detection level ("0.4") of the left power supply coil L1 in the power supply coil L1 whose presence detection level is "1.0 " is included in the first area A1. The presence detection level ("0.7") of the power supply coil L1 on the right side in the power supply coil L1 whose presence detection level is 0.9 is included in the second area A2.

As in the first embodiment, the common control circuit 12 determines which of the water-standing coils L3 is to be installed in accordance with the higher degree R calculated from the existence detection level of each of the areas A1, Pattern is estimated and power is supplied to the power supply pattern in which the output of the power reception device 30 becomes the maximum in the estimated installation pattern.

According to the second embodiment described above, in addition to the effects (1) and (2) of the first embodiment, the following effects can be obtained.

(3) Even when two water-standing coils L3 are provided adjacent to each other, the position and attitude of each water-standing coil L3 are estimated, and the power supply pattern in which the power of each of the water receiving apparatuses 30 is maximized .

(Third Embodiment)

Hereinafter, a third embodiment of the non-contact power feeding system according to the present invention will be described with reference to Fig. The noncontact power supply system of the third embodiment is different from the first embodiment in that the power supply pattern in which the existence detection level when the plurality of water-discharging coils L3 are adjacent to each other and the output power of the power reception device is the maximum is stored in advance . Hereinafter, differences from the first embodiment will be mainly described. The noncontact feeding system of the third embodiment has substantially the same configuration as that of the noncontact feeding system of the first embodiment shown in Fig.

9, in the memory 14, in addition to the data shown in Fig. 3, each of the power supply coils L1 in the fourth and fifth installation patterns in which a plurality of water-receiving coils L3 are provided adjacent to each other, And a power supply pattern in which the output of the power reception device 30 is maximized in the fourth and fifth installation patterns are stored in advance. The common control circuit 12 uses the existence detection level of each of the power supply coils L1 in the fourth installation pattern and the fifth installation pattern as in the first to third installation patterns in the first embodiment (R) is calculated. When the common control circuit 12 determines that the upper diagram R in the fourth installation pattern is the minimum, it is estimated that the plurality of water-receiving coils L3 are arranged in the fourth installation pattern, Feeding the power supply coil L1 with the power supply pattern shown on the upper right side. Likewise, when it is determined that the upper diagram R in the fifth installation pattern is the minimum, the common control circuit 12 estimates that a plurality of water-receiving coils L3 are arranged in the fifth installation pattern, The power supply coil L1 is supplied with the power supply pattern shown on the lower right side of Fig. By supplying power to these power supply patterns, the output power of the power reception device 30 can be maximized.

According to the third embodiment described above, in addition to the effect (3) of the second embodiment, the following effects can be obtained.

(4) Even when a plurality of water-standing coils L3 are provided adjacent to each other, the power supply pattern in which the output of the power reception device 30 is maximized without calculating the superposition degree R for each water- It can be judged.

(Fourth Embodiment)

Hereinafter, a fourth embodiment of the noncontact power feeding system according to the present invention will be described with reference to FIG. Hereinafter, differences from the first embodiment will be mainly described.

As shown in Fig. 10, in the memory 14, in addition to the data of Figs. 3 and 9, the respective power supply coils L3 and L3, which are provided in the sixth and seventh installation patterns, And the power supply pattern at which the output of the power reception device 30 becomes the maximum in the sixth and seventh installation patterns are stored in advance.

As shown in the upper part of Fig. 10, the water-supplying coil L3 of the sixth installation pattern is formed into a rectangle having long sides along the left and right direction, and is connected to the power supply coil L1 of "3 rows x 3 columns" Is located at the lower center of the center. 10, the water-supplying coil L3 of the seventh installation pattern is formed in a circular shape and is located at the center of the power supply coil L1 of "3 rows x 3 columns". In the seventh installation pattern, the installation position of the water-supplying coil L3 is the same as the first installation pattern (see Fig. 3), but since the shape of the water-supplying coil L3 is different from the first installation pattern, And was different from the first installation pattern.

As in the first embodiment, the common control circuit 12 calculates the upper level R using the existence detection level of each installation pattern. When the common control circuit 12 determines that the upper diagram R in the sixth installation pattern is the minimum, the power supply to the power supply coil L1 is performed with the third power supply pattern, and the output becomes the maximum. As a result, an output of 18 W at maximum can be obtained in the water receiving apparatus (30).

Further, when the common control circuit 12 determines that the upper diagram R in the seventh installation pattern is the minimum, the power supply to the power supply coil L1 is performed with the first power supply pattern, and the output becomes the maximum. Thereby, the maximum power (15 W) output can be obtained in the water receiving apparatus (30). That is, the shape of the water-discharging coil L3 as well as the position and attitude of the water-discharging coil L3 can be estimated through the upper diagram R. Therefore, it is possible to supply power to the power supply pattern suitable for the shape of the water-receiving coil L3.

According to the fourth embodiment described above, particularly the following effects can be obtained.

(5) The presence detection level in the case where the shape of the water-dedicated coil L3 is different from each other and the power supply pattern in which the output of the power reception device 30 in this case becomes the maximum are stored in advance. Thereby, even when the shape of the water-discharging coil L3 is different, it is possible to feed the power supply pattern with the maximum output.

(Fifth Embodiment)

Hereinafter, a fifth embodiment of the noncontact power feeding system according to the present invention will be described with reference to Figs. 11 to 13. Fig. The noncontact feeding system of the fifth embodiment has substantially the same configuration as the noncontact feeding system of the first embodiment shown in Fig. Hereinafter, differences from the first embodiment will be mainly described.

In the non-contact power supply system of the fifth embodiment, presence detection is performed by the primary-side authentication coil L2. That is, as indicated by the two-dot chain line in Fig. 1, the voltage detection circuit 19 is connected to the primary side authentication coil L2. The voltage detection circuit 19 detects the voltage of the primary side authentication coil L2 and outputs the detection result to the common control circuit 12. [ The common control circuit 12 sequentially supplies currents to the respective primary-side authentication coils L2 as in the first embodiment, and performs presence detection in accordance with the detection results of the voltage detection circuit 19 at that time.

As shown in Figs. 11 (a) to 11 (d), the secondary-side authentication coils L4 in the respective water receiving devices 30 are formed to have the same shape, The shapes are formed differently. Specifically, the water-standing coil L3 shown in Fig. 11A is formed into a quadrangle along the outer periphery of the secondary-side authentication coil L4. The water-supplying coil L3 shown in Fig. 11 (b) is formed into a square larger than the water-supplying coil L3 shown in Fig. 11 (a). The water-supplying coil L3 shown in Fig. 11 (c) is formed as a rectangle having long sides along the vertical direction in the figure. The water-supplying coil L3 shown in Fig. 11 (d) is formed in a circular shape. In any of the water-only coils L3, the secondary-side authentication coil L4 is located at the center thereof. The primary side authentication coil L2 corresponds to the primary side communication coil and the secondary side authentication coil L4 corresponds to the secondary side communication coil.

In the memory 34 of the water receiving apparatus 30, information relating to the shape of its water-receiving coil L3 is stored in advance. The secondary side control circuit 33 generates an information signal including information on the shape of the water-only coil L3 stored in the memory 34 together with the ID signal, and transmits the ID signal and the information signal to the secondary- And transmits the data wirelessly via the secondary side authentication coil 32 and the secondary side authentication coil L4.

The primary side authentication circuit 18 demodulates the information signal received via the primary side authentication coil L2 and outputs the demodulated signal to the common control circuit 12. [ The common control circuit 12 recognizes the shape of the water-receiving coil L3 according to the information signal.

13, in the memory 14, the position and attitude of each secondary-side authentication coil L4 and the shape of the water-discharging coil L3 are combined with each other, And a table showing a power supply pattern at which the output becomes maximum is stored.

Hereinafter, a case where two water receiving devices 30 having different shapes of the water-discharging coil L3 are provided will be described. 12 (a), the common control circuit 12 recognizes the presence detection level of the primary-side authentication coil L2 through the voltage detection circuit 19. As shown in Fig. Next, as shown in Fig. 12B, the common control circuit 12 selects the first area A1 and the second area A2 as in the second embodiment, (R) is calculated for each installation pattern. Then, by comparing the upper diagram R, it is estimated which of the installation patterns each of the secondary-side certification coils L4 is close to. Then, the common control circuit 12 determines, in the table of Fig. 13, which data regarding the position and posture of the secondary authentication coil L4 should be referred to. Next, the common control circuit 12 recognizes the shape of the water-receiving coil L3 according to the received information signal, and according to the shape of the water-receiving coil L3, It is determined which pattern the shape of the line L3 is. At this point, as shown in Fig. 12C, the position and posture of the water-discharging coil L3 can be recognized. Then, the common control circuit 12 determines a power feeding pattern that maximizes the output of the power reception device 30 with reference to the table in Fig. 13, and feeds the power supply coil L1 with the power feeding pattern. Thereby, even when the water receiving devices 30 having different shapes of the water-receiving coils L3 in the water receiving devices 30 are installed at the same time, a power feeding pattern in which the output of the water receiving device 30 is maximized is realized.

According to the fifth embodiment described above, the following effects can be obtained in particular.

(6) Since the shape of the secondary-side authentication coil L4 is unified, information on the shape of the water-dedicated coil L3 can be acquired, so that, depending on the position and posture of the secondary- The size, position and posture of the power transmission line L3, and further, the power feeding pattern in which the output of the power reception device 30 becomes the maximum can be recognized. According to this configuration, as shown in Fig. 10 in the fourth embodiment, it is not necessary to store the existence detection levels for each of the water-dedicated coils L3 having different shapes and for the different positions and attitudes with respect to the respective shapes. Specifically, the presence detection level may be stored for different positions and attitudes with respect to the secondary side authentication coil L4, which is a unified shape. Moreover, it is not necessary to calculate the superimposed degree R for each water-only coil L3 having a different shape and for different positions and attitudes with respect to the respective shapes. Therefore, it is possible to reduce the processing burden on the estimation of the position and attitude of the water-receiving coil L3 in the common control circuit 12. [ Thereby, even when the shape of the water-discharging coil L3 is different, it is possible to quickly determine the appropriate feeding pattern.

The above-described embodiments can be carried out in the following modified forms.

In the third embodiment, only when the number of the power supply coils L1 having the existence detection level equal to or higher than the threshold value T1 becomes equal to or greater than the threshold value, the fourth and fifth installations The upper level R may be calculated with respect to the presence detection level of each of the power supply coils L1 in the pattern (see Fig. 9). As a result, when there is one water-only coil L3, the number of the power supply coils L1 whose existence detection level is equal to or greater than the threshold value T1 becomes less than the threshold value, The calculation of the upper degree R is omitted. Therefore, it is possible to perform the process relating to determination of the installation position more quickly.

In the above-described embodiments, the ID collation is performed through transmission and reception of the ID request signal and the ID signal, but this may be omitted. As a result, both the authentication circuits 18 and 32 and the coils L2 and L4 for authentication in the first to fourth embodiments can be omitted.

In the first embodiment, the presence detection is performed through the voltage of the power supply coil L1, but the presence detection coil may be provided separately from the power supply coil L1. This also applies to the second to fifth embodiments.

- The feeding pattern and the installation pattern in each of the above embodiments are examples, and there may be more patterns. For example, the first installation pattern (see FIG. 3) may be rotated at intervals of 5 degrees with the coil axis as the center of rotation to increase the installation pattern. When the new installation pattern is to be increased, the presence detection level in the pattern and the power supply pattern at which the output from the power reception device 30 in the pattern becomes the maximum are stored in the memory 14.

In each of the above embodiments, power feeding was performed in a power feeding pattern in which the output of the power reception device 30 was maximized. However, when the power required by the power reception device 30 is small, the power supply may be performed with a power supply pattern whose output is not maximized.

For example, as shown in Fig. 3, when it is estimated that the first installation pattern is installed, it is assumed that the power required by the power reception apparatus 30 is 9W. In this case, 9 W can be ensured, and power can be supplied to the first feeding pattern having the smallest number of the power supply coils L1 for supplying power. As a result, the power feed to the power supply coil L1 can be suppressed.

In the second embodiment, the existence detection level of the overlapping portion of the first area A1 and the second area A2 shown in FIG. 8 (c) may be included in both areas A1 and A2. That is, in the example shown in Fig. 8C, the existence detection levels "0.7" and "0.4" in which both areas A1 and A2 overlap are included in each of the areas A1 and A2.

In the second embodiment, the two water-only coils L3 are disposed adjacent to each other, but the same process can be performed when three or more water-bearing coils L3 are provided adjacent to each other. That is, when three or more water-standing coils L3 are provided, a new threshold value is set in accordance with the number of the power supply coils L1 whose existence detection level is equal to or greater than the threshold value T1. Thereby, the common control circuit 12 outputs three or more power-receiving coils L3 according to the comparison between the number of the power supply coils L1 whose existence detection level is equal to or greater than the threshold value T1 and the new threshold value, Can be judged to be installed. For example, when three water-standing coils L3 are provided adjacent to each other, the upper three existence detection levels are recognized, and three regions centered on the existence detection levels are selected. Hereinafter, processing is performed in the same manner as in the second embodiment.

In the first to fourth embodiments, presence detection may be performed by the primary-side authentication coil L2 in the same manner as in the fifth embodiment. In this case, the size and shape of the water-only coil L3 and the secondary-side authentication coil L4 are set equal.

- In the first, second, and fourth embodiments, for example, the output power of the power reception device 30 in the first to fifth feeding patterns is stored for each installation pattern. However, only the feed pattern at which the output becomes maximum may be stored. In the third and fifth embodiments, not only the power supply pattern at which the output becomes the maximum, but also the output power at each power supply pattern may be stored.

In the first to fifth embodiments, the presence detection is performed according to the voltage value of the power supply coil L1 or the primary side authentication coil L2. However, the presence detection may be performed according to the current value of the power supply coil L1 or the primary side authentication coil L2.

In the first to fifth embodiments, the position and posture of the water-discharging coil L3 and the like are estimated based on the calculated existence detection level. However, the process of estimating the position and the posture in the water-receiving coil L3 may be performed using the voltage value of the power supply coil L1 or the like as it is without calculating the presence detection level.

In each of the above embodiments, the water receiving apparatus 30 is provided in the portable terminal 40, but it may be provided in other electric apparatuses. For example, the water receiving apparatus 30 may have a configuration independent of the main body of the electric apparatus.

In the fifth embodiment, an information signal regarding the shape of the water-receiving coil L3 was transmitted and received via the two authentication coils L2 and L4. However, a dedicated communication coil may be provided.

Although the common control circuit 12 performs all the control in each of the above embodiments, a unit control circuit may be provided in each of the power supply units 15, and the unit control circuit may perform a part of the control. For example, the unit control circuit feeds the power supply coil L1 in accordance with a command signal from the common control circuit 12 or transmits an ID request signal through the primary side authentication coil L2. The unit control circuit may calculate the existence detection level according to the detection result of the voltage detection circuit 17 and output the calculation result to the common control circuit 12. [ Also, the unit control circuit may perform ID matching. As a result, the processing burden on the common control circuit 12 can be reduced.

Claims (9)

As a non-contact power feeding system,
And a plurality of power supply coils disposed along the major surface, wherein each of the plurality of power supply coils generates an alternating magnetic flux by being supplied with an alternating current;
And a water-receiving coil for generating an electric power to be supplied to the load in accordance with the alternating magnetic flux when the water-
Lt; / RTI >
The power supply device includes:
A presence detection unit for detecting whether or not the water receiving apparatus facing each of the plurality of power supply coils exists;
A position / posture estimating unit for estimating a position and a posture of the water-receiving coil with respect to the feeding surface in accordance with the detection result of the presence detecting unit;
And a power value of an organic power generated by the water-receiving coil in each of the plurality of the power feeding patterns is set to a value corresponding to a power value of the water- A memory for storing a first table indicating the first table; And
A power supply control section for selecting a power supply pattern having the highest power supply efficiency based on the position and posture of the water-receiving coil estimated by the position / posture estimation section based on the first table,
And a contactless power supply system. The method according to claim 1,
Wherein the presence detection unit detects a presence detection level of each of the power supply coils indicating the degree of magnetic coupling between each of the power supply coils and the water-receiving coils depending on a voltage value or a current value in each of the power supply coils of the power reception apparatus Lt; / RTI >
Wherein the position and orientation estimating section estimates the position and attitude of the water-receiving coil according to a distribution of a plurality of existence detection levels of the plurality of power-supply coils. 3. The method of claim 2,
Wherein the memory stores a second table indicating the relationship between the position and attitude of the water-receiving coil on the feeder surface and the presence detection level of each of the power supply coils,
Wherein the position and orientation estimating section is configured to calculate the position and orientation of the power supply coil based on the difference between the presence detection level of each of the power supply coils in the second table stored in the memory and the presence detection level of each of the power supply coils detected by the presence detection section And estimates that the position and posture corresponding to the presence detection level at which the calculated degree of superposition is the minimum is provided as the position and posture of the water-receiving coil. The method according to claim 2 or 3,
Wherein the position /
The number of the water-supplying coils provided on the ground surface is determined in accordance with the number of the power-supply coils facing the water-receiving coil detected by the presence detection unit,
Wherein the control unit recognizes the presence detection levels in the same number as the number of the water-retaining coils among the plurality of existence detection levels in order from the large presence detection level when it is determined that a plurality of water-
Selecting the level of existence of the power supply coil in a region centered on the power supply coil corresponding to each recognized presence detection level, Contactless feed system for estimating posture. 3. The method of claim 2,
The memory may be configured such that when the plurality of water-discharging coils are provided adjacent to each other at a different position and posture and the presence detection level of each of the power-supplying coils is provided adjacent to the water- And a second table indicating a relationship between a power value of a plurality of organic powers generated by the power receiving apparatus by supplying power to each of the power supplying coils with the plurality of power feeding patterns,
The power supply control section selects a power feeding pattern having the highest power feeding efficiency in the position and posture of the single or plural power receiving coils detected by the position / posture estimating section according to the second table stored in the memory And the feeding is performed by the feeding pattern. 3. The method of claim 2,
Wherein the memory stores the presence detection level of each of the power supply coils when a plurality of water-receiving coils having different shapes are installed in different positions and postures and a plurality of water- A second table indicating the relationship between the power value of the organic power generated by each of the water-receiving coils in each of the plurality of power feeding patterns,
The position and orientation estimating section estimates the shape of the water-receiving coil and the position and posture of the water-receiving coil according to the presence detection level of each of the power-supply coils,
The feed controller selects a feed pattern having the highest feed efficiency in the shape, position, and posture of the water-receiving coil estimated by the position / posture estimator based on the second table, Contact power supply system. The method according to claim 1,
Wherein the power feeding device includes a plurality of primary side communication coils provided corresponding to the plurality of power supply coils,
Wherein the power reception device includes a secondary side communication coil provided corresponding to the water-receiving coil,
Wherein the presence detection unit detects a presence detection level of each of the primary side communication coils indicating the degree of magnetic coupling between the primary side communication coil and the secondary side communication coil according to a voltage value or a current value in the primary side communication coil Therefore,
Wherein the position and orientation estimation section estimates the position and posture of the secondary side communication coil according to the distribution of the plurality of presence detection levels of the plurality of primary side communication coils, A non-contact power feeding system for estimating the position and posture of a dedicated coil. 8. The method of claim 7,
Wherein the water receiving apparatus is one of a plurality of water receiving apparatuses,
Wherein said plurality of water receiving devices include a plurality of said water receiving coils having different shapes and a plurality of said secondary communication coils having a single shape,
Each of the receiving apparatuses wirelessly transmits an information signal concerning the shape of the water-receiving coil of itself by the secondary-side communication coil,
The memory may further include a plurality of power supply patterns corresponding to different shapes of the plurality of water-receiving coils, a position and an attitude of the secondary communication coil, and an organic And a second table indicating a relationship between the power value and the power value of the power,
Wherein the power supply control unit receives the information signal from each of the receiving apparatuses, determines the shape of the water-receiving coil in accordance with the information signal, and estimates the position and attitude of the secondary- And selects the power feeding pattern having the highest power feeding efficiency with reference to the second table according to the shape of the coil, and feeds power by the power feeding pattern. The method according to claim 2 or 3,
Wherein the power feeding pattern having the highest power feeding efficiency is a power feeding pattern in which the output power of the power receiving device is maximized.

Images