TW201401709A - Contactless power supply device and contactless power supply system - Google Patents

Abstract

Disclosed is a contactless power supply device and a contactless power supply system that, based on the existence/non-existence of a powered coil supplied with power by a power supply coil via the Electromagnetic Induction, adjust the working frequency of detecting process that works repeatedly to detect the existence/non-existence of the powered coil. Thus, such the contactless power supply device and contactless power supply system are able to decrease the consumed power under the situation that the powered coil is not disposed oppositely with the power supply coil.

Description

Contactless power supply unit and contactless power supply system

The present invention relates to a contactless power supply device and a contactless power supply system including the power supply device that supplies power from the contactless power supply device and the aforementioned contactless power supply device.

A contactless power supply system that supplies power from a power supply coil of a contactless power supply device to a power receiving coil of a power supply device by utilizing an electromagnetic induction phenomenon has been known in the past. Further, there is a following non-contact power supply system in which it is known whether or not a secondary side machine including a secondary side coil (receiving coil) is disposed at a position opposing the primary side coil (supply coil) ( In the detection processing of the power supply device, the power supply coil is driven when the secondary side device is disposed (for example, refer to Patent Document 1).

In the technique disclosed in Patent Document 1, it is possible to detect the presence or absence of the secondary side machine (receiving coil) based on the input current value of the drive circuit input to the primary side coil when the excitation current of the primary side coil is supplied to the primary side coil. . Moreover, the detection processing of such a secondary side machine is periodically performed.

However, in the above technique, it is necessary to drive the power supply coil in order to detect the power receiving coil. Therefore, the secondary side machine (receiving coil) is not facing When it is placed in a contactless power supply unit (power supply coil), power is also consumed in order to perform detection processing. In particular, in the case where the non-contact power supply device includes a plurality of power supply coils, it is necessary to perform detection processing with a plurality of power supply coils. Therefore, the increase in the power consumed to detect the processing becomes remarkable.

[Previous Technical Literature] [Patent Literature]

(Patent Document 1) Japanese Patent Laid-Open Publication No. 2011-30284

The present invention has been made in view of the above circumstances, and an object of the invention is to provide a contactless power supply device and a contactless power supply system capable of reducing power consumed when a power receiving coil is not disposed opposite to a power feeding coil. .

The non-contact power supply device and the non-contact power supply system of the present invention are capable of adjusting the presence or absence of the presence of the power receiving coil based on the presence or absence of the power receiving coil supplied from the power supply coil by the electromagnetic induction phenomenon. The execution frequency (frequency) of the detection process. Therefore, in such a non-contact power supply device and a non-contact power supply system, it is possible to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

The above and other objects, features, and advantages of the present invention will be apparent from the description and appended claims.

1, 1a, 1b‧‧‧ contactless power supply system

2, 2a, 2b‧‧‧ contactless power supply

3‧‧‧Powered devices

4, 4a, 4b‧‧‧Control Department

21, 31‧‧‧ frame

22‧‧‧Loading surface (1st opposite)

23, 23a, 23b, 23c, 23d‧‧‧ power supply coil

24‧‧‧ Current Detection Department

25‧‧‧Power Department

32‧‧‧Loaded surface (2nd opposite)

33‧‧‧Acoustic coil

41‧‧‧Detection Department

42, 42a, 42b‧‧‧Detection Control Department

43‧‧‧Coil Selection Department

44‧‧‧Coil Control Department

45‧‧‧Timer

46‧‧‧ counter

47‧‧‧Memory Department

251‧‧ ‧ gate driver circuit

421‧‧‧Detection Frequency Acquisition Department

422‧‧‧Execution frequency adjustment department

B‧‧‧Coil Drive Block

C‧‧‧ capacitor

Cj‧‧‧Number of decisions

Cf‧‧‧ frequency count value

CT‧‧‧ count value

I‧‧‧ coil number

I‧‧‧ coil current

P1‧‧‧ connection point

Q1, Q2‧‧‧ field effect transistor

Ts‧‧‧ benchmark time

Tw‧‧‧Elapsed time

VDD‧‧‧Power supply voltage

Ref1, Ref2‧‧‧ frequency reference value

TM‧‧‧Timer setting

1 is an explanatory view for explaining an example of a configuration of a non-contact power supply system according to a first embodiment of the present invention.

Fig. 2 is a block diagram showing an example of an electrical configuration of a contactless power supply device in the contactless power supply system shown in Fig. 1.

FIG. 3 is an explanatory diagram for explaining inductance (interaction) of the power supply coil in the case where the power supply coil and the power receiving coil are overlapped in the non-contact power supply system shown in FIG. 1 .

Fig. 4 is an explanatory view for explaining an interaction caused by a positional relationship between a power supply coil and a power receiving coil in the non-contact power supply system shown in Fig. 1.

Fig. 5 is a graph showing an example of the relationship between the facing area of the power supply coil and the power receiving coil and the inductance of the power supply coil in the non-contact power supply system shown in Fig. 1.

FIG. 6 is an explanatory view for explaining the relationship between the presence or absence of the power receiving coil disposed at the opposite position and the coil current of the power feeding coil in the non-contact power supply system shown in FIG.

Fig. 7 is a flow chart showing an example of the operation of the non-contact power supply device shown in Fig. 2.

Fig. 8 is a block diagram showing an example of a configuration of a non-contact power supply device according to a second embodiment of the present invention.

Fig. 9 is a flow chart showing an example of the operation of the non-contact power supply device shown in Fig. 8.

Fig. 10 is a block diagram showing an example of a configuration of a non-contact power supply device according to a third embodiment of the present invention.

Fig. 11 is a front half of the flowchart showing an example of the operation of the non-contact power supply device shown in Fig. 10.

Fig. 12 is a second half of the flowchart showing an example of the operation of the non-contact power supply device shown in Fig. 10.

Hereinafter, an embodiment of the present invention will be described based on the drawings. In the drawings, the same components are denoted by the same reference numerals, and the description thereof will be omitted as appropriate. Further, in the present specification, the case of the collective designation is displayed by omitting the reference symbol after the addition of the character, and in the case of the individual configuration, the reference symbol with the added character is displayed.

(First embodiment)

Fig. 1 is an explanatory view for explaining an example of a configuration of a non-contact power supply system according to the first embodiment. The non-contact power supply system 1 shown in FIG. 1 includes a non-contact power supply device 2 and a power supply device 3, and is configured in combination. The contactless power supply device 2 and the power supply device 3 are configured to be separable.

The non-contact power supply device 2 includes a substantially box-shaped casing 21, and the power feeding device 3 includes a substantially box-shaped casing 31. In FIG. 1, the upper surface of the casing 21 of the non-contact power supply device 2 is regarded as a mounting surface (first opposing surface) 22 on which the power feeding device 3 is placed. The portion on which the upper surface of the frame 21 is formed is an example of a mounting member. The lower surface of the casing 31 of the power feeding device 3 is a mounting surface (second opposing surface) 32 for contacting the mounting surface 22 and contacting it. In the example shown in FIG. 1, the frame 21 of the contactless power supply device 2 is larger than the frame 31 of the power supply device 3, and the mounting surface 22 is compared. The mounting surface is also wide.

In the non-contact power supply device 2, a plurality of quadratic arrays are arranged so as to be inside (directly below) the mounting surface 22 in the casing 21 and the coil upper surface is substantially parallel along the mounting surface 22. Power supply coils 23. The plurality of power feeding coils 23 are closely arranged such that the distance between the power feeding coils 23 is substantially zero. That is, a plurality of power supply coils 23 are disposed such that the circumferential surfaces of the coils are in contact with each other.

The power receiving device 3 is provided with a plurality of power receiving coils 33 disposed on the inner side (directly above) of the mounting surface 32 in the casing 31 and the coil upper surface is substantially parallel along the mounting surface 32. The power receiving coil 33 is a power supply target that is supplied by the power feeding coil 23 by the electromagnetic induction phenomenon. The power receiving device 3 is provided with a load (not shown). Further, the electric power received by the power receiving coil 33 is supplied to the load (not shown).

Fig. 2 is a block diagram showing an example of the electrical configuration of the non-contact power supply device 2 in the non-contact power supply system 1 shown in Fig. 1. The non-contact power supply device 2 shown in FIG. 2 includes a plurality of coil drive blocks B and a control unit 4. The coil drive block B includes a power supply coil 23, and the plurality of coil drive blocks B are respectively provided corresponding to the plurality of power supply coils 23.

The coil drive block B includes a power supply coil 23, a current detecting unit 24, and a power supply unit 25. The power supply unit 25 is a circuit that selectively supplies a high-frequency voltage to the plurality of power supply coils 23, and includes, for example, a gate driver circuit 251, FETs (Field Effect Transistors) Q1, Q2, and a capacitor C.

In addition, the power supply coil 23 can also be one, and the coil drive block B Can also be one.

The FET Q1 is, for example, a P channel FET, and the FET Q2 is, for example, an N channel FET. Then, a source voltage VDD supplied from a power supply circuit (not shown) is applied to the source of the FET Q1, a drain of the FET Q1 is connected to the drain of the FET Q2, and a source of the FET Q2 is connected to the ground of the circuit. . The connection point P1 between the FET Q1 and the FET Q2 is connected to the circuit ground through the capacitor C, the current detecting unit 24, and the power supply coil 23.

The gate driver circuit 251 turns on (ON) and turns off (OFF) the FET Q1 and the FET Q2 in a substantially high frequency in accordance with a control signal from the control unit 4, and turns on the other side when one is turned on. disconnect. Thereby, a high-frequency voltage can be generated at the connection point P1 by the FETs Q1 and Q2. The capacitor C cuts off the DC component from the high-frequency voltage generated by the FETs Q1 and Q2, and supplies the remaining high-frequency component to the power supply coil 23.

The current detecting unit 24 detects the coil current I flowing to the power feeding coil 23 in accordance with the high-frequency voltage supplied from the power supply unit 25. Then, the current detecting unit 24 outputs a signal indicating the current value of the detected coil current I to the control unit 4. The current detecting unit 24 is, for example, a current sensor such as a shunt resistor or a Hall element.

The contactless power supply device 2 is only provided with the same number of coil drive blocks B constructed in this manner as the power supply coil.

The control unit 4 includes, for example, a CPU (Central Processing Unit) that performs predetermined arithmetic processing; a non-volatile ROM (Read Only Memory) that stores a predetermined control program; and temporarily stores data. Volatile RAM (Random Access Memory: Random access memory); and these peripheral circuits are constructed. Then, the control unit 4 functionally includes the detection unit 41, the detection control unit 42, the coil selection unit 43, and the coil control unit 44 by executing, for example, a control program stored in the ROM, and functions as the detection unit 41. The functions of the detection control unit 42, the coil selection unit 43, and the coil control unit 44.

The detecting unit 41 repeatedly executes the detection of the presence or absence of the power receiving coil 33 disposed at the opposite position so as to overlap the plurality of power feeding coils 23 at the execution interval set by the detection control unit 42. Measurement processing. More specifically, the detecting unit 41 supplies the high-frequency voltage to the power feeding coil 23, for example, by driving the power supply unit 25 of the block B for each coil (Process A). Then, the detecting unit 41 causes the coil current I of each of the power feeding coils 23 to be detected by each current while the high-frequency voltage is supplied to the corresponding power feeding coils 23 by the current detecting unit 24 of each coil driving block B. The portion 24 detects (process B). Then, the detecting unit 41 determines that there is a power receiving coil (process C) at a position facing the power feeding coil 23 corresponding to the current detecting unit 24, and the current detecting unit 24 detects a coil exceeding a determination value set in advance. Current 1.

The detecting unit 41 performs detection processing including the above-described processing A, processing B, and processing C corresponding to the plurality of power feeding coils 23, respectively. In this manner, the detecting unit 41 detects the presence or absence of the power receiving coil 33 disposed at a position facing each of the plurality of power feeding coils 23, respectively. Then, the detecting unit 41 repeatedly performs such detection processing corresponding to each of the power feeding coils 23 at an execution interval corresponding to each of the power feeding coils 23, respectively.

Figure 3 is used in the contactless power supply system 1 shown in Figure 1 An illustration of the inductance of the power supply coil 23 in the case where the power feeding coil 23 and the power receiving coil 33 are overlapped with each other is disposed. First, as shown in FIG. 3A, in the example shown in FIG. 3A, the alignment is performed in a completely overlapping manner, and the power feeding coil 23 and the power receiving coil 33 are overlapped with each other on a coil surface which will be described later.

Next, the voltage is output from the power supply unit 25 and the coil current is caused to flow to the power supply coil 23 (Fig. 3B). When the coil current flows to the power supply coil 23, an interlinkage magnetic flux is generated by the power supply coil 23 so as to penetrate the power supply coil 23 and the power receiving coil 33 (FIG. 3C).

When the interlinkage magnetic flux penetrates the power receiving coil 33, the coil current of the power receiving coil 23 is reversely rotated by the electromagnetic induction phenomenon. By the reversely rotating coil current, the power receiving coil 33 generates an interlinkage magnetic flux in a direction opposite to the magnetic flux generated by the power feeding coil 23. Therefore, a current flows in the power supply coil 23 blocks the interlinkage magnetic flux generated by the power receiving coil 33 (Fig. 3D).

In this manner, when the power supply coil 23 and the power receiving coil 33 are opposed to each other so as to overlap each other, the power supply coil 23 is supported by the magnetic circuit formed by the power supply coil 23 and the power receiving coil 33. In the case of the single unit and the case where the power supply coil 23 and the power receiving coil 33 are opposed to each other, the current flowing to the power supply coil 23 is different. Therefore, in the case where the power supply coil 23 is single and the power supply coil 23 and the power receiving coil 33 are arranged to face each other, the inductance of the external appearance of the power supply coil 23 changes.

4 is a view for explaining the interaction caused by the positional relationship between the power supply coil 23 and the power receiving coil 33 in the contactless power supply system shown in FIG. 1. Description of the figure. Fig. 5 is a graph showing an example of the relationship between the facing area of the power supply coil 23 and the power receiving coil 33 and the inductance of the power feeding coil 23 in the non-contact power supply system shown in Fig. 1.

4A is an explanatory view showing a state in which the position of the power feeding coil 23 and the position of the power receiving coil 33 coincide with each other. In other words, FIG. 4A is an explanatory view showing an example in which the power feeding coil 23 and the power receiving coil 33 are opposed to each other so as to completely overlap each other, and the facing area of the power transmitting coil 23 and the power receiving coil 33 is maximized. .

The coil faces of the power supply coil 23 and the power receiving coil 33 are planes surrounded by the winding wires on the outermost circumference of the power feeding coil 23 and the power receiving coil 33, and are interlinked with the power feeding coil 23 and the power receiving coil 33. A plane in which the flux is orthogonal to the direction of expansion. The area of the power feeding coil 23 is the area of the coil surface of the power feeding coil 23, and the area of the power receiving coil 33 is the area of the coil surface of the power receiving coil 33. The area where the power supply coil 23 and the power receiving coil 33 face each other is the area of the portion where the coil surface of the power feeding coil 23 and the coil surface of the power receiving coil 33 face each other and overlap each other.

As shown in FIG. 4A, when the position of the power feeding coil 23 and the position of the power receiving coil 33 coincide with each other, the facing area of the power transmitting coil 23 and the power receiving coil 33 is maximized. When the facing area of the power feeding coil 23 and the power receiving coil 33 becomes the largest, the number of interlinking magnetic fluxes that are interlinked between the power feeding coil 23 and the power receiving coil 33 becomes maximum, and the interaction between the power feeding coil 23 and the power receiving coil 33 becomes maximum. As a result, the inductance of the power supply coil 23 is minimized.

As shown in FIG. 4B, at the position of the power supply coil 23 and the power receiving coil 33 The positions of the coil axes do not coincide with each other, and when the respective positions of the coil axes are shifted, the facing area of the power feeding coil 23 and the power receiving coil 33 is smaller than that shown in Fig. 4A. Therefore, the number of interlinkage fluxes that are interlinked to the power feeding coil 23 and the power receiving coil 33 is reduced. Therefore, the interaction between the power feeding coil 23 and the power receiving coil 33 becomes small, and as a result, the inductance of the power feeding coil 23 becomes larger than the case shown in Fig. 4A.

As shown in FIG. 4C, when the position of the power feeding coil 23 and the position of the power receiving coil 33 do not overlap each other and are completely shifted, the facing area of the power transmitting coil 23 and the power receiving coil 33 becomes zero. Therefore, the interaction between the power supply coil 23 and the power receiving coil 33 becomes unnecessary, and the inductance of the power supply coil 23 becomes maximum.

According to the above, the facing area of the power feeding coil 23 and the power receiving coil 33 and the inductance of the power feeding coil 23 are in a predetermined relationship. For example, as shown in FIG. 5, the inductance becomes smaller as the opposing area of the coil is larger. Since the inductance of the power supply coil 23 and the direct facing area of the coil are in a one-to-one correspondence relationship as shown in FIG. 5, the inductance of the power supply coil 23 is information indicating the area in which the coil is facing, and is an example of the aforementioned information.

FIG. 6 is an explanatory view for explaining the relationship between the presence or absence of the power receiving coil disposed at the opposite position and the coil current of the power feeding coil in the non-contact power supply system shown in FIG. For example, as shown in FIG. 6A, when the four power feeding coils 23a, 23b, 23c, and 23d are arranged in a row, the power receiving coil 33 is disposed to face the power feeding coil 23b and the power feeding coil 23c which are adjacent to each other.

In the state shown in FIG. 6A, since the power supply coils 23a, 23d are paired Since the respective facing areas of the power receiving coils 33 are zero, the inductances of the power feeding coils 23a and 23d become large values according to the graph shown in FIG. When the inductance of the power supply coil 23 is L, the voltage of the high-frequency voltage output from the power supply unit 25 is V, and the frequency is f, the coil current I of the power supply coil 23 can be expressed by the following formula (1). To represent.

I=V/(2 π fL)...(1)

Therefore, the coil current I becomes larger as the inductance is smaller. Since the coil current I and the inductance are in a one-to-one correspondence relationship, the coil current I detected by the current detecting unit 24 is information indicating the inductance of the power feeding coil 23, and is an example of the above information.

Further, the coil current I is a value that becomes larger as the opposing area is larger. Since the coil current I has a one-to-one correspondence with the area of the pair, the coil current I detected by the current detecting unit 24 also becomes the information indicating the area of the power supply coil 23, and is the aforementioned information. An example.

As described above, since the coil current I is a smaller value as the area is smaller, the coil current I flowing to the power supply coils 23a and 23d having the area zero is as shown in Fig. 6B. Small value. In this way, a current value which is slightly larger than the coil current I flowing to the power supply coils 23a and 23d having the area of zero is set in advance as a determination as to whether or not to overlap the power receiving coil 33 on the coil surface. The judgment value of the power supply coil 23. On the other hand, the coil current I flowing to the power feeding coils 23b and 23c opposed to the power receiving coil 33 so as to overlap the coil surface is larger than the coil current I flowing to the power feeding coils 23a and 23d, and is larger than The decision value is still larger.

Further, although the example in which the detecting unit 41 detects the power receiving coil 33 based on the current value of the coil current I has been shown, it is not necessarily limited to the case where the power receiving coil 33 is detected based on the coil current I. For example, an optical sensor may be disposed in the vicinity of each of the power feeding coils 23, and the detecting portion 41 detects the opposite side of each of the power feeding coils 23 by the plurality of optical sensors. Whether or not the power supply device 3 (power receiving coil 33) exists. When the power supply device 3 is placed on the mounting surface 22, the amount of light received by the optical sensor is reduced, so that the presence or absence of the placement of the power supply device 3 can be detected by the plurality of optical sensors. The position of the power supply device 3 placed on the mounting surface 22 can be detected.

Further, the detecting unit 41 may be configured to measure the inductance of each of the power feeding coils 23 by, for example, a known inductance measuring means. Then, in such a case, the detecting unit 41 determines that the power receiving coil 33 exists at a position facing the power feeding coil 23 that does not detect the inductance that is less than the above-described determination value and the corresponding inductance value.

Although the inductance measurement process of the optical sensor or the power supply coil 23 consumes power, the detection unit 41 detects the power receiving coil based on the optical sensor or the inductance measurement, and can reduce the execution frequency of the detection process. To reduce power consumption.

The detection control unit 42 causes the detection unit 41 to repeatedly detect the execution interval of the detection processing by the detection unit 41 while detecting the presence of the power receiving coil 33 by the detecting unit 41. Measurement processing.

The coil selecting unit 43 selects, from among the plurality of power feeding coils 23, that the detecting unit 41 determines that the power receiving coil 33 is present at the opposite position. One or a plurality of power supply coils 23 are used as excitation target coils.

The coil control unit 44 supplies the high-frequency voltage to the power supply coil as the excitation target coil by the coil selection unit 43 by the power supply unit 25, and the power supply coils 23b and 23c in the example shown in FIG. Thereby, in the example shown in FIG. 6, electric power can be supplied from the plurality of power feeding coils 23b and 23c to the power receiving coil 33.

Thereby, the user can place the power feeding device 3 on the mounting surface 22 shown in FIG. 1, and even if the power feeding coil 23 and the power receiving coil 33 are not correctly positioned, the coil selecting unit 43 can select and One or a plurality of power feeding coils 23 that are opposed to each other by the power receiving coil 33 on the coil surface are used as the exciting target coil. Then, a high-frequency voltage is supplied to the excitation target coil, and electric power is supplied from the excitation target coil to the power receiving coil 33. Therefore, even if the power feeding coil 23 and the power receiving coil 33 are not correctly positioned, the position of the power feeding coil and the power receiving coil is shifted, and the power can be supplied from the non-contact power feeding device 2 to the power receiving device 3.

Hereinafter, the operation of the non-contact power supply system 1 as described above will be described. First, the number of the power supply coils 23 is set to n. Then, coil numbers of 1 to n are attached to the n power feeding coils 23. Hereinafter, the power supply coil 23 of the coil number i is referred to as a power supply coil 23 (i). The coil drive block B including the power supply coil 23(i) is denoted as a coil drive block B(i). The current detecting unit 24 and the power supply unit 25 included in the coil driving block B(i), that is, the current detecting unit 24 and the power supply unit 25 corresponding to the power feeding coil (i) are respectively referred to as the current detecting unit 24(i) and Power supply unit 25(i). The coil current I detected by the current detecting unit 24(i), that is, flows to the power supply coil 23(i) The coil current I is denoted as the coil current I(i). Further, the timer 45 corresponding to the power feeding coil 23(i) is denoted by the timer (i), and the timer setting value TM of the timer 45(i) is expressed as the timer setting value TM(i).

Fig. 7 is a flow chart showing an example of the operation of the non-contact power supply device 2 shown in Fig. 2. The flowchart shown in Fig. 7 shows the action corresponding to the power supply coil 23(i). The control unit 4 performs the same operations as those of the flowchart shown in Fig. 7 in parallel with all of the power feeding coils 23(1) to 23(n).

First, the detection control unit 42 sets an initial value set in advance to the timer setting value TM(i) as an initial process (step S1). The initial value is set to a predetermined time, for example, 1 second. Also, the initial value is the lower limit value of the timer set value TM (execution interval).

Next, the detecting unit 41 sets the timer setting value TM(i) to the timer 45(i), and starts the timer 45(i) (step S2). The timer 45(i) is time's up when the timer setting value TM(i) has elapsed from the time of counting.

Next, the detecting unit 41 determines whether or not the timer 45(i) has elapsed (step S3). Then, when the timer 45(i) has elapsed (YES in step S3), the detecting unit 41 causes the power supply unit 25(i) to supply the high-frequency voltage to the power supply coil in order to start the detection processing. 23(i) (step S4).

Next, the detecting unit 41 compares the coil current I(i) detected by the current detecting unit 24(i) with the determination value (step S5). As a result of the comparison, when the coil current I(i) is equal to or less than the determination value (NO in step S5), the detecting unit 41 determines that there is no power receiving coil at a position facing the power feeding coil 23(i). 33 (step S6). On the other hand, the results of the aforementioned comparison, online When the loop current I(i) exceeds the determination value (YES in step S5), the detecting unit 41 determines that the power receiving coil 33 exists at a position facing the power feeding coil 23(i) (step S9). The above steps S4 to S6 and S9 are equivalent to an example of detection processing.

Then, in step S6, the detecting unit 41 determines that there is no power receiving coil 33 at a position facing the power feeding coil 23(i), and the coil control unit 44 causes the power supply unit 25(i) to stop the power feeding coil 23 (i) Supplying a high frequency voltage (step S7). Next, the detection control unit 42 increases the timer setting value TM(i) by adding, for example, one second to the timer setting value TM(i) (step S8). Then, the detection control unit 42 proceeds to step S2 in order to repeatedly perform the detection processing by the detection unit 41.

Thereby, since the detecting unit 41 repeatedly performs the detecting process at the time interval of the timer setting value TM(i), the timer setting value TM(i) corresponds to an example of the execution interval.

On the other hand, in step S9, the detecting unit 41 determines that the power receiving coil 33 exists at a position facing the power feeding coil 23(i), and the coil selecting unit 43 selects the power feeding coil 23(i) as the exciting object. Coil. Then, the coil control unit 44 causes the power supply unit 25(i) to supply the high-frequency voltage to the power supply coil 23(i) as the excitation target coil (step S10). Thereby, the non-contact power supply device 2 can supply electric power to the power-supplied device 3 in a non-contact manner.

In this case, the detection control unit 42 does not increase the value of the timer setting value TM(i), and moves to step S2 in order to repeat the detection processing by the detecting unit 41.

Table 1 shows an example in which the power receiving coil 33 is not detected in the first to fourth detection processes. According to steps S1 to S10, as shown in Table 1, the timer setting value TM is sequentially increased by one second in response to the detection processing of the first to fourth times in which the power receiving coil 33 is not detected. Then, when the power receiving coil 33 is detected in the fifth detection processing (YES in step S5, step S9), the timer setting value TM corresponding to the fifth detection processing is not increase.

In this way, the detection control unit 42 causes the execution interval of the detection processing by the detection unit 41 to be detected by the detection unit 41 by the detection of the steps S2 to S10. When the increase is made, the detecting unit 41 repeatedly performs the detecting process. As a result, as shown in Table 1, the period during which the detection unit 41 does not detect the existence of the power receiving coil 33 (the first to fourth detection times) continues to be longer, and the timer setting value TM (execution) The interval is increased.

The increase in the execution interval of the detection process reduces the execution frequency of the detection process. Therefore, the detection control unit 42 performs the detection processing by the detection unit 41 not detecting that the period of the existence of the power receiving coil 33 continues for a long period of time. The frequency is reduced.

The frequency of use of the non-contact power supply device 2 (power supply coil 23) for non-contact power supply by the power supply device 3 facing the non-contact power supply device 2 is based on the user's situation or non-contact. The nature of the power supply device 2 and the power supply device 3 are greatly different. Therefore, in the case where the frequency of use of the non-contact power supply device 2 is low and the case where the frequency of use of the non-contact power supply device 2 is low, when the execution frequency of the detection process is made equal, When the power receiving coil 33 is not disposed opposite to the power feeding coil 23, the power that is consumed is lost.

Therefore, if the processing of steps S2 to S10 is performed, the period in which the presence of the power receiving coil 33 is not detected by the detecting unit 41 continues for a long period of time, that is, the contactless power supply device depending on the user is considered. When the frequency of use 2 is low, the execution frequency of the detection process is reduced. Therefore, it is easier to reduce the consumed electric power when the power receiving coil 33 is not disposed opposite to the power feeding coil 23. The same effect can be obtained even in the case where the power supply coil 23 is one.

Further, as shown in FIG. 1, when a plurality of power feeding coils 23 are arranged in a matrix shape along the table-like mounting surface 22, the user places the power feeding device 3 on the mounting surface. The probability of being near the center of 22 is higher. As a result, the power feeding coil 23 disposed near the center of the mounting surface 22 and the power feeding coil 23 disposed near the end of the mounting surface 22 differ in the frequency to be used. Thus, the plurality of power supply coils 23 may have a difference in frequency between them.

The plurality of power supply coils 23 differ in frequency between them In the case where the execution frequencies of the detection processes corresponding to the respective power feeding coils 23 are equal, the power receiving coils 23 having a lower frequency of use are not disposed opposite to the power feeding coils 23 in the power receiving coils 33. Increase the power that is wasted and wasted.

Therefore, the execution frequency of the detection processing corresponding to the power supply coil 23 can be reduced by performing the processing of steps S2 to S10 corresponding to the respective power supply coils 23, and the power supply coil 23 is not detected by the detecting unit 41. The power supply coil 23 that continues for a long period of time until the presence of the power receiving coil 33 is considered to be dependent on the power supply coil 23 whose frequency of use is low. As a result, it is easy to reduce the consumed electric power by the power supply coil 23 corresponding to the detection processing of the power receiving coil 33 that is not disposed oppositely.

Further, although the control unit 4 has been shown to execute the detection processing corresponding to each of the power feeding coils 23 in parallel, the non-contact power feeding device 2 may include a plurality of control units 4 corresponding to the respective power feeding coils 23.

Further, in step S8, although the detection control unit 42 has increased the timer setting value TM (execution interval) by one second, the detection control unit 42 increases the timer setting value TM (execution interval). The situation is not limited. The detection control unit 42 may be configured to increase the timer setting value TM (execution interval) by, for example, multiplying the previously set magnification.

Further, although the detection control unit 42 has been shown that the detection unit 41 has determined that the power receiving coil 33 is present at a position facing the power feeding coil 23 (i) (step S9), the timer setting value TM is not made ( The value of i) is increased to the example of step S2, but the detection unit 41 may determine that the power receiving coil 33 is present at a position facing the power feeding coil 23(i) (step In step S9), the detection control unit 42 moves to step S1 and sets an initial value as the timer setting value TM(i).

The frequency at which the user uses the non-contact power supply device 2 (the power supply coil 23) is changed. Therefore, when the detecting unit 41 determines that the power receiving coil 33 is present at a position facing the power feeding coil 23 (i) (step S9), the detecting control unit 42 preferably sets the initial value, that is, the timer setting value. The TM (execution interval) lower limit value is used as the timer set value TM(i). In other words, the detection control unit 42 detects that the power receiving coil 33 is detected by the detecting unit 41, and preferably sets the foregoing execution to an initial value that is set as the lower limit of the execution interval in advance. The interval is such that after the execution interval is initialized, the detecting unit 41 repeats the detection processing. Thereby, in the case where the frequency of use of the user has increased, the timer setting value TM (execution interval) can be shortened, and the execution frequency of the detection processing can be increased.

Further, the detection control unit 42 may be configured to continuously detect that the power receiving coil 33 is present at a position facing the power feeding coil 23(i) in the detection processing of the number of times set in advance, and to detect the control. The unit 42 moves to step S1 and sets an initial value as the timer setting value TM(i). In other words, the detection control unit 42 may be configured to continuously detect the presence of the power receiving coil 33 by the detecting unit 41 while the detection processing is repeatedly performed for a predetermined number of times. Execution interval initialization.

The detecting unit 41 continuously determines that the power receiving coil 33 is present at a position facing the power feeding coil 23(i) in the detection process of the number of times set in advance, and can determine that the frequency of use of the user has increased. Very high. Therefore, the user's frequency of use can be judged with higher certainty. In the case of an increase, the timer set value TM (execution interval) can be shortened, and the execution frequency of the detection process is increased.

(Second embodiment)

Next, the non-contact power supply system 1a of the second embodiment will be described. The contactless power supply system 1a includes a contactless power supply device 2a and a power supply device 3 (FIG. 1). The non-contact power supply system 1a of the second embodiment differs from the non-contact power supply system 1 of the first embodiment in the configuration of the contactless power supply device 2a.

Fig. 8 is a block diagram showing an example of the configuration of the non-contact power supply device 2a. The difference between the non-contact power supply device 2a shown in FIG. 8 and the non-contact power supply device 2 shown in FIG. 2 is the configuration of the control unit 4a. The control unit 4a of the non-contact power supply device 2a of the second embodiment differs from the control unit 4 of the non-contact power supply device 2 of the first embodiment in the operation of the detection control unit 42a and further includes a counter. 46. The counter 46 is provided in plural numbers corresponding to the plurality of power supply coils 23. Hereinafter, the counter 46 corresponding to the power feeding coil 23(i) is denoted as the counter 46(i), and the counter value CT of the counter 46(i) is expressed as the count value CT(i).

Since the other components are the same as those of the non-contact power supply device 2 shown in Fig. 2, the description thereof will be omitted. Hereinafter, the features of the present embodiment will be mainly described.

The detection control unit 42a causes the detection unit 41 to repeatedly perform the detection process until the detection unit 41 detects the presence of the power receiving coil 33. When the detection processing is repeatedly performed, the detection control unit 42a repeatedly detects that the power receiving coil 33 is not detected in the detection processing every time the number of determinations Cj is set in advance. When it exists, the execution interval of the detection process is increased. In other words, the detection control unit 42a increases the execution interval each time the number of times the power receiving coil 33 is not detected by the detection processing reaches the number of determinations set in advance.

The counter 46 counts the number of times the detecting unit 41 determines that the power receiving coil 33 does not exist.

Next, the operation of the non-contact power supply device 2a shown in Fig. 8 will be described. Fig. 9 is a flow chart showing an example of the operation of the non-contact power supply device 2a shown in Fig. 8.

In the flowchart shown in FIG. 9, the same steps as those in FIG. 7 are attached with the same step numbers as in FIG. 7, and the description thereof is omitted. In other words, the detection control unit 42a performs the same operation as the detection control unit 42 except for the processes other than the processes of steps S101, S102, and S103.

First, the detection control unit 42a initializes the count value CT(i) of the counter 46(i) to 0 after the processing of step S1, and proceeds to the processing of step S2 (step S101).

Further, the detection control unit 42a adds 1 to the count value CT(i) of the counter 46(i) after the processing of step S7 (step S102). Thereby, the detection control unit 42a causes the counter 46(i) to count the detection unit 41 to determine the number of times the power receiving coil 33 does not exist at the position facing the power feeding coil 23(i).

Then, the detection control unit 42a compares the count value CT(i) of the counter 46(i) with the number of determinations Cj after the processing of the step S102 (step S103). Then, when the count value CT(i) and the number of determinations Cj are equal (YES in step S103), the detection control unit 42a moves to the processing of step S8. And increase the timer setting value TM(i). On the other hand, when the count value CT(i) is less than the number of determinations Cj and is not equal (NO in step S103), the detection control unit 42a moves to the counter set value TM(i) without increasing it. The processing of step S2 is performed in response to the detection processing by the detecting unit 41.

Table 2 shows an example of the operation of the non-contact power supply device 2a in the case where the number of determinations Cj is 2.

As described above, according to the respective processes of steps S1 to S10 and the processes of S101 to S103, as shown in Table 2, in the first detection process, even if the process of step S6 is performed, it is determined that there is no power receiving coil 33. In the case, since the count value CT is also less than the number of determinations Cj (= 2), the timer set value TM does not increase. In the second detection processing, since the power receiving coil 33 is determined by the processing of step S6, and the count value CT is equal to the number of determinations Cj (= 2), the timer setting value TM is increased from 1 second to 1 second. 2 seconds.

Therefore, the timer set value TM is increased every time the presence of the undetected power receiving coil 33 is repeatedly performed by the number of determinations Cj. result, As shown in Table 2, the period during which the presence of the power receiving coil 33 is not detected by the detecting unit 41 (the first to fourth times of the number of detection processes) continues to be longer, and the timer setting value TM (execution) The interval is increased.

The increase in the execution interval of the detection process reduces the execution frequency of the detection process. Therefore, when the detection control unit 42a continues to detect that the period in which the power receiving coil 33 is not present by the detecting unit 41, the execution frequency of the detection processing is reduced. Thereby, the contactless power supply device 2a can obtain the same effect as the non-contact power supply device 2.

Further, even when the user's use frequency is high, there are few cases where the user does not use the non-contact power supply device 2a (the power supply coil 23(i)) for a long period of time. In such a case, each time the detecting unit 41 does not detect the power receiving coil 33 and increases the timer setting value TM(i) (execution interval), regardless of whether the user's frequency of use is high or not, the detection is high. The execution frequency of the measurement process will become lower. When the execution frequency of the detection processing is low, the response time after the user has placed the power receiving coil 33 facing the power feeding coil 23 (i) until the power supply is started is delayed. This is not good in terms of ensuring the convenience of users who use it frequently.

On the other hand, if the processing of the power receiving coils 33 is not detected by the detecting unit 41 in a plurality of times in accordance with the processing of the steps S102 and S103, the timer setting value TM(i) (execution interval) is caused. ) increase. Therefore, even if the user with a high frequency of use does not use the non-contact power supply device 2a (the power supply coil 23(i)) for a long time, the increase of the timer setting value TM(i) (execution interval) can be suppressed. .

In addition, although the case where the number of determination times Cj is 2 has been exemplified, it is determined. The number of times Cj can be, for example, 10 or 100, and the numerical value is not limited. Further, in the above, although the example in which the number of determinations Cj is a fixed value has been shown, the number of determinations Cj may be changed. For example, the number of determinations Cj may be increased each time the count value CT is equal to the number of determinations Cj.

(Third embodiment)

Next, the non-contact power supply system 1b of the third embodiment will be described. The contactless power supply system 1b includes a contactless power supply device 2b and a power supply device 3 (FIG. 1). The non-contact power supply system 1b of the third embodiment differs from the non-contact power supply system 1 of the first embodiment in the configuration of the contactless power supply device 2b.

Fig. 10 is a block diagram showing an example of the configuration of the non-contact power supply device 2b. The difference between the non-contact power supply device 2b shown in FIG. 10 and the non-contact power supply device 2 shown in FIG. 2 is the configuration of the control unit 4b. The control unit 4b of the third embodiment differs from the control unit 4 of the non-contact power supply device 2 of the first embodiment in the configuration and operation of the detection control unit 42b, and further includes a storage unit 47.

Since the other components are the same as those of the non-contact power supply device 2 shown in Fig. 2, the description thereof will be omitted. Hereinafter, the features of the present embodiment will be mainly described.

The detection control unit 42b includes a detection frequency acquisition unit 421 and an execution frequency adjustment unit 422. The detection frequency acquisition unit 421 is based on whether or not the detection unit 41 has detected the power receiving coil 33 (based on the presence or absence of the power receiving coil 33 of the detecting unit 41) during the detection processing, and the acquisition detecting unit 41 has detected The frequency of the power receiving coil 33 is used as the detection frequency value. Execution frequency adjustment unit 422 is The less the detection frequency, the more the detection processing execution frequency is reduced.

The memory unit 47 stores the detected frequency value obtained by the detection frequency acquisition unit 421. The memory unit 47 is, for example, non-volatile such as an EEPROM (Electrically Erasable and Programmable Read Only Memory) or a FeRAM (Ferroelectric Random Access Memory). Memory component.

Next, the operation of the contactless power supply device 2b shown in Fig. 10 will be described. 11 and 12 are flowcharts showing an example of the operation of the non-contact power supply device 2b. In the flowcharts shown in FIG. 11 and FIG. 12, the same steps as those in FIG. 7 are attached with the same step numbers as in FIG. 7, and the description thereof is omitted. In other words, the detection control unit 42b performs the same operations as the detection control unit 42 except for the processes other than the processes of steps S201 to S204 and S211 to S215.

In steps S1 to S7, S9, S10, and S201 to S204 shown in FIG. 11, the counting of the frequency count value Cf(i) is first performed during the reference time ts which is set in advance. The timer set value TM(i) is set to a fixed value (for example, 1 second) during the period in which the counting of the frequency count value Cf(i) is performed. The frequency count value Cf(i) is the number of times the detection unit 41 determines that the power receiving coil 33 is present at a position facing the power feeding coil 23(i) during the reference time ts. In other words, the frequency count value Cf(i) is an example of information indicating that the detection unit 41 has detected the detection frequency of the power receiving coil 33 at a position facing the power feeding coil 23(i).

The reference time ts is the execution time of the process of obtaining the detection frequency, and for example, one day, or one month may be used.

The detection frequency acquisition unit 421 initializes the frequency count value Cf(i) to 0 after the processing of step S1 (step S201). Next, the detection frequency acquisition unit 421 starts counting the elapsed time tw by using, for example, a software timer (step S202). The elapsed time tw is the elapsed time after the start of the frequency acquisition process.

Hereinafter, since the processing of steps S2 to S10 is the same as the processing after the processing of step S8 is removed from FIG. 7, the description thereof will be omitted.

The detection frequency acquisition unit 421 does not have the power receiving coil 33 at a position facing the power feeding coil 23 (i) (step S6), and after the processing of step S7, compares the elapsed time tw with the reference time ts (step S204). Then, when the elapsed time tw is equal to or less than the reference time ts (NO in step S204), the detection frequency acquisition unit 421 directly repeats the state in which the timer setting value TM(i) is fixed to the initial value. The detection process proceeds to step S2.

On the other hand, the detection frequency acquisition unit 421 has the power receiving coil 33 at a position facing the power feeding coil 23 (i) (step S9), and after the processing of step S10, adds the frequency count value Cf(i). 1 (step S203), and the process proceeds to step S204. Then, the detection frequency acquisition unit 421 compares the elapsed time tw with the reference time ts as described above (step S204), and when the elapsed time tw is equal to or less than the reference time ts (NO in step S204), the detection frequency acquisition is performed. The unit 421 directly performs the detection processing in a state where the timer setting value TM(i) is fixed to the initial value, and moves to step S2.

Then, in step S204, when the elapsed time tw exceeds the reference time In the case of ts (YES in step S204), the detection frequency acquisition unit 421 stores the current frequency count value Cf(i) in the memory unit 47 as information indicating the detection frequency, and proceeds to the process of step S211.

Next, in each of the processes of steps S211 to S215, the execution frequency adjustment unit 422 sets the timer based on the frequency count value Cf(i) stored in the storage unit 47 and the frequency reference values Ref1 and Ref2 set in advance. Set value TM(i). The frequency reference value Ref1 is set to a value smaller than the frequency reference value Ref2.

First, in the processing of step S211, the execution frequency adjustment unit 422 compares the frequency count value Cf(i) with the frequency reference value Ref1. As a result of the comparison, when the frequency count value Cf(i) is equal to or lower than the frequency reference value Ref1 (NO in step S211), the execution frequency adjustment unit 422 determines that the detection frequency is low, and sets, for example, 10 seconds as the timing. The set value TM(i) is set (step S212). Thereafter, the execution frequency adjustment unit 422 shifts to the processing of step S2.

On the other hand, when the frequency count value Cf(i) exceeds the frequency reference value Ref1 (YES in step S211), the execution frequency adjustment unit 422 compares the frequency count value Cf(i) with the frequency reference value Ref2. As a result of the comparison, when the frequency count value Cf(i) is equal to or less than the frequency reference value Ref2, that is, the frequency count value Cf(i) exceeds the frequency reference value Ref1 and is equal to or lower than the frequency reference value Ref2 (NO in step S213) The execution frequency adjustment unit 422 determines that the detection frequency is moderate, and sets, for example, 5 seconds as the timer setting value TM(i) (step S214). Thereafter, the execution frequency adjustment unit 422 shifts to the processing of step S2.

Processing the result of the comparison of S213, the frequency count value Cf(i) exceeds the frequency When the rate reference value Ref2 is exceeded, that is, when the frequency count value Cf(i) exceeds the frequency reference value Ref1 and exceeds the frequency reference value Ref2 (YES in step S213), the execution frequency adjustment unit 422 determines that the detection frequency is higher. It is high, and, for example, 1 second is set as the timer setting value TM(i) (step S215). Thereafter, the execution frequency adjustment unit 422 shifts to the processing of step S2.

As described above, by the processing of steps S211 to S215, the execution frequency adjustment unit 422 increases the timer setting value TM(i) as the detection frequency is smaller. That is, the execution frequency adjustment unit 422 reduces the execution frequency of the detection processing as the detection frequency is smaller.

Hereinafter, the detection processing is repeatedly performed based on the timer setting unit TM(i) set by the execution frequency adjustment unit 422 by the respective processes of steps S2 to S7, S9, and S10.

As described above, according to the processing shown in FIG. 11 and FIG. 12, similarly to the non-contact power supply device 2 shown in FIG. 2, the frequency of use of the non-contact power supply device 2 depending on the user is reduced. The execution frequency of the detection process. Therefore, it is easy to reduce the consumed electric power when the power receiving coil 33 is not disposed opposite to the power feeding coil 23. The same effect can be obtained even in the case where the power supply coil 23 is one.

Further, as shown in FIG. 1, in the case where a plurality of power feeding coils 23 are arranged in a matrix along the plate-shaped mounting surface 22, similarly to the non-contact power feeding device 2 shown in FIG. 2, it is possible to reduce and depend on The execution frequency of the detection processing corresponding to the power supply coil 23 of the user whose frequency of use is low. As a result, it is easy to reduce the consumed electric power by the power supply coil 23 corresponding to the detection processing of the power receiving coil 33 that is not disposed oppositely.

Although the present specification has disclosed various aspects of the technology as described above, the main techniques thereof will be summarized below.

A non-contact power supply device that supplies power to a power receiving coil that is a power supply target by an electromagnetic induction phenomenon, and includes: a power supply coil that is capable of arranging the power receiving coil in a facing direction; and a detecting unit And a detection process for detecting the presence of the power receiving coil in a position opposite to the power supply coil; and a detection control unit that detects whether the power receiving coil is detected by the detecting unit The presence of the detection unit performs the aforementioned execution frequency of the detection process. In addition, another aspect of the non-contact power supply device includes: a power supply coil for supplying power to the power receiving coil by electromagnetic induction; and a detecting portion that is repeatedly disposed opposite to the power supply coil Detecting whether the position detection detects the presence or absence of the power receiving coil; and detecting a control unit that is repeatedly executed by the detecting unit based on the presence or absence of the power receiving coil detected by the detecting unit The execution frequency of the aforementioned detection processing.

In such a non-contact power supply device, the execution frequency of the detection processing performed by the detecting unit can be adjusted based on the presence or absence of the power receiving coil of the detecting unit. Therefore, in such a non-contact power supply device, it is easy to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect, in the non-contact power supply device, the detection control unit causes the execution frequency to be longer when the period in which the power receiving coil is not detected by the detecting unit continues to be longer. The more it is reduced.

In such a non-contact power supply device, it is considered that the period in which the power receiving coil is not detected by the detecting unit continues for a long period of time, that is, the power receiving coil is When the frequency of the opposite arrangement to the power supply coil is low, the execution frequency of the detection processing is reduced. As a result, in such a non-contact power supply device, it is easy to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect of the invention, in the non-contact power supply device, the detection control unit increases the execution interval of the detection processing while detecting the presence of the power receiving coil by the detecting unit. The detection unit is repeatedly subjected to the detection processing described above.

In such a non-contact power supply device, the longer the duration during which the detection unit does not detect the presence of the power receiving coil, the more the execution interval of the detection process increases. When the execution interval of the detection process is increased, the execution frequency of the detection process is reduced. Therefore, in such a non-contact power supply device, it is considered that the period in which the power receiving coil is not detected by the detecting unit continues for a long period of time, that is, the frequency at which the power receiving coil is opposed to the power feeding coil is low. Reduce the execution frequency of detection processing. As a result, in such a non-contact power supply device, it is easy to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect of the invention, in the non-contact power supply device, the detection control unit performs the detection of the presence of the power receiving coil in the detection process by repeating the number of determinations set in advance. The process of increasing the aforementioned execution interval. In other words, the detection control unit increases the execution interval when the number of times the presence of the power receiving coil is not detected reaches the predetermined number of determinations by the detection processing.

Such a non-contact power supply device is not required to be set in advance. When the number of determinations is repeated and the presence of the aforementioned power receiving coil is not detected in the detection processing, the processing for increasing the execution interval is not performed. Therefore, in such a non-contact power supply device, for example, a user who uses a non-contact power supply device with a high frequency of use does not use a non-contact power supply device (the power receiving coil is not disposed opposite to the power supply coil). It can reduce the increase in the execution interval.

In another aspect, in the non-contact power supply device, the detection control unit detects that the presence of the power receiving coil is detected by the detecting unit, and is set in advance as the execution interval. The initial value of the lower limit value sets the execution interval, and after the initialization interval is initialized, the detection unit is again caused to perform the detection processing in reverse.

In such a non-contact power supply device, the presence of the power receiving coil is not detected by the detecting portion, so that the execution interval returns to the initial value, and until the existence of the power receiving coil is detected again, the detection is performed. The execution interval of the measurement process is increased while the detection process is repeated depending on the detection process of the detection unit. Therefore, in such a non-contact power supply device, when the frequency of use of the user increases, the execution interval can be shortened and the execution frequency of the detection process can be increased.

In another aspect, in the non-contact power supply device, the detection control unit continuously detects the presence of the power receiving coil by the detecting unit in the detecting process of the preset number of times The situation is initialized. In other words, the detection control unit sets the execution interval when the detection unit continuously detects the presence of the power receiving coil while the detection processing is repeatedly performed for a predetermined number of times. initial Chemical.

In the detection processing of the number of times set in advance, the presence of the power receiving coil is continuously detected at a position facing the power feeding coil, and it is possible to determine that the user's use frequency has increased with high certainty. Therefore, in such a non-contact power supply device, it is possible to judge that the frequency of use of the user has increased with a high degree of certainty, and it is possible to initialize and shorten the execution interval and increase the execution frequency of the detection process.

In another aspect, in the non-contact power supply device, the detection control unit includes: a detection frequency acquisition unit that acquires the Detector based on the presence or absence of the power receiving coil detected by the detection unit The measuring unit has detected the frequency of the presence of the power receiving coil as the detecting frequency; and executes the frequency adjusting unit, which reduces the aforementioned execution frequency as the detecting frequency is less.

In such a non-contact power supply device, the frequency at which the detecting unit has detected the presence of the power receiving coil, that is, the frequency of use of the user, can be obtained as the detection frequency by detecting the frequency obtaining unit. Then, by executing the frequency adjustment unit, the smaller the detection frequency, that is, the less the user's use frequency, the more the detection processing frequency can be reduced. Therefore, in such a non-contact power supply device, it is easy to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect, in the non-contact power supply device, the power supply coil includes a plurality of coils, and the detecting unit performs the detection processing on each of the plurality of coils, and the detection control unit is respectively The execution frequency of each detection process corresponding to each of the aforementioned coils is adjusted.

In such a non-contact power supply device, even if a plurality of coils differ in the frequency of use, the execution frequency of the detection processing can be individually adjusted for each coil. As a result, in such a non-contact power supply device, it is easy to reduce the consumed electric power in the detection process of the power receiving coil corresponding to the coil that is not disposed oppositely.

Further, another aspect of the non-contact power supply system includes: one of the above-described non-contact power supply devices; and a power supply device including the power receiving coil.

In such a non-contact power supply system, it is easy to reduce the consumed electric power when the power receiving coil is not disposed opposite to the power feeding coil.

This application is based on Japanese Patent Application No. 2012-125947, filed on Jan. 1, 2012 in Japan, the content of which is incorporated herein.

In the above, the present invention has been described with sufficient reference to the drawings, and the present invention will be described with reference to the drawings. However, it should be understood that those skilled in the art of the present invention can easily change and/or improve the above. The embodiment. Therefore, it is to be understood that the modifications and improvements may be made by those of ordinary skill in the art to which the invention pertains. The modified form is still covered by the claimed scope of the claim.

(industrial availability)

According to the present invention, a contactless power supply system, a contactless power supply device, and a powered device can be provided.

1, 1a, 1b‧‧‧ contactless power supply system

2, 2a, 2b‧‧‧ contactless power supply

3‧‧‧Powered devices

21, 31‧‧‧ frame

22‧‧‧Loading surface (1st opposite)

23‧‧‧Power supply coil

32‧‧‧Loaded surface (2nd opposite)

33‧‧‧Acoustic coil

Claims (9)

A non-contact power supply device characterized by comprising: a power supply coil for supplying power to a power receiving coil by electromagnetic induction; and a detecting portion for repeatedly detecting whether a position opposite to the power feeding coil is detected The detection processing of the presence of the power receiving coil; and the detection control unit adjusts the detection performed by the detecting unit based on the presence or absence of the power receiving coil detected by the detecting unit The frequency of execution of the process. The non-contact power supply device according to claim 1, wherein the detection control unit reduces the execution frequency as the period during which the detection unit does not detect the existence of the power receiving coil continues to be longer. . The non-contact power supply device according to claim 2, wherein the detection control unit increases the execution interval of the detection processing while detecting the presence of the power receiving coil by the detecting unit The detecting unit is repeatedly caused to perform the detecting process. The non-contact power supply device of claim 3, wherein the detection control unit is configured to detect, when the number of times the power receiving coil is not detected, reaches a predetermined number of determinations each time , the aforementioned execution interval is increased. The non-contact power supply device of claim 3, wherein the detection control unit is configured to detect the presence of the power receiving coil by the detecting unit, and the pair is set in advance as the execution interval. The initial value of the limit value sets the execution interval, and after the initialization interval is initialized, the detection unit is again caused to perform the detection processing in reverse. The non-contact power supply device of claim 5, wherein the detection control unit continuously detects the power receiving by the detecting unit while repeatedly performing the detecting process for a predetermined number of times In the case of the presence of a coil, the aforementioned execution interval is initialized. The non-contact power supply device of claim 1, wherein the detection control unit includes: a detection frequency acquisition unit that acquires the detection based on the presence or absence of the power receiving coil detected by the detection unit The portion has detected the frequency of the presence of the power receiving coil as the detection frequency; and the frequency adjustment unit performs a reduction in the execution frequency as the detection frequency is less. The non-contact power supply device of claim 1, wherein the power supply coil has a plurality of coils; the detecting unit performs the detection processing on each of the plurality of coils; and the detection control unit adjusts The execution frequency of each detection process corresponding to each of the aforementioned coils. A contactless power supply system comprising: the contactless power supply device described in claim 1; and a power supply device including a power receiving coil.