WO2013179583A1

WO2013179583A1 - Contactless power-feeding device and contactless power-feeding system

Info

Publication number: WO2013179583A1
Application number: PCT/JP2013/003020
Authority: WO
Inventors: 聡兵頭
Original assignee: パナソニック株式会社
Priority date: 2012-06-01
Filing date: 2013-05-10
Publication date: 2013-12-05
Also published as: TW201401709A; JP2013252011A

Abstract

In this contactless power-feeding device and contactless power-feeding system, the execution frequency of a repeatedly executed detection process, which detects the presence or absence of a power-reception coil that is fed power by a power-feeding coil via electromagnetic induction, is adjusted on the basis of the presence or absence of said power-reception coil. Contactless power-feeding devices and contactless power-feeding systems such as these can thus reduce the amount of power consumed when the power-reception coil and the power-feeding coil are not positioned opposite each other.

Description

Non-contact power supply device and non-contact power supply system

The present invention relates to a non-contact power feeding device, and a non-contact power feeding system including a power-supplied device to which power is supplied from the non-contact power feeding device and the non-contact power feeding device.

2. Description of the Related Art Conventionally, a non-contact power supply system that supplies power from a power supply coil of a non-contact power supply device to a power reception coil of a power supply device by using an electromagnetic induction phenomenon is known. And the detection process which detects whether the secondary side apparatus (power-supplied apparatus) containing a secondary side coil (power receiving coil) is arrange | positioned in the position facing a primary side coil (power feeding coil), A non-contact power feeding system that drives a power feeding coil when a secondary device is arranged is known (see, for example, Patent Document 1).

In the technique disclosed in Patent Document 1, the presence or absence of a secondary device (power receiving coil) is detected based on the input current value to the drive circuit of the primary coil when an alternating excitation current is supplied to the primary coil. Is done. Such secondary device detection processing is periodically executed.

However, in the above-described technique, it is necessary to drive the feeding coil in order to detect the receiving coil. For this reason, even when the secondary side device (power receiving coil) is not arranged to face the non-contact power feeding device (power feeding coil), power is consumed to execute the detection process. In particular, when the non-contact power supply apparatus includes a plurality of power supply coils, it is necessary to execute detection processing for the number of power supply coils. For this reason, the increase in power consumed for the detection process becomes significant.

JP 2011-30284 A

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a non-contact power supply apparatus and a non-contact power supply system that can reduce power consumed when the power receiving coil is not disposed opposite to the power supply coil. Is to provide.

In the non-contact power feeding device and the non-contact power feeding system according to the present invention, the presence / absence of the power receiving coil, which is repeatedly executed, is detected based on the presence / absence of the power receiving coil that is fed by the electromagnetic induction phenomenon from the power feeding coil. The execution frequency of the detection process is adjusted. For this reason, such a non-contact electric power feeder and a non-contact electric power feeding system can reduce the electric power consumed when the receiving coil is not arrange | positioned facing the electric power feeding coil.

The above and other objects, features and advantages of the present invention will become apparent from the following detailed description and the accompanying drawings.

It is explanatory drawing for demonstrating an example of a structure of the non-contact electric power feeding system in 1st Embodiment of this invention. It is a block diagram which shows an example of the electrical constitution of the non-contact electric power feeder in the non-contact electric power feeding system shown in FIG. In the non-contact electric power feeding system shown in FIG. 1, it is explanatory drawing for demonstrating the inductance (interaction) of a feeding coil at the time of opposing arrangement | positioning so that a feeding coil and a receiving coil may overlap. In the non-contact electric power feeding system shown in FIG. 1, it is explanatory drawing for demonstrating the interaction by the positional relationship of a feeding coil and a receiving coil. In the non-contact electric power feeding system shown in FIG. 1, it is a graph which shows an example of the relationship between the facing area of a feeding coil and a receiving coil, and the inductance of a feeding coil. In the non-contact electric power feeding system shown in FIG. 1, it is explanatory drawing for demonstrating the relationship between the presence or absence of the receiving coil arrange | positioned in the position which opposes so that it may overlap with a feeding coil, and the coil current of a feeding coil. It is a flowchart which shows an example of operation | movement of the non-contact electric power supply shown in FIG. It is a block diagram which shows an example of a structure of the non-contact electric power feeder in 2nd Embodiment of this invention. It is a flowchart which shows an example of operation | movement of the non-contact electric power supply shown in FIG. It is a block diagram which shows an example of a structure of the non-contact electric power feeder in 3rd Embodiment of this invention. It is the first half of the flowchart which shows an example of operation | movement of the non-contact electric power supply shown in FIG. It is the latter half of the flowchart which shows an example of operation | movement of the non-contact electric power supply shown in FIG.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings. In addition, the structure which attached | subjected the same code | symbol in each figure shows that it is the same structure, The description is abbreviate | omitted suitably. Further, in this specification, when referring generically, it is indicated by a reference symbol without a suffix, and when referring to an individual configuration, it is indicated by a reference symbol with a suffix.

(First embodiment)
Drawing 1 is an explanatory view for explaining an example of composition of a non-contact electric supply system in a 1st embodiment. A non-contact power supply system 1 shown in FIG. 1 includes a non-contact power supply device 2 and a power-supplied device 3 and is configured by combining them. The non-contact power supply device 2 and the power supplied device 3 are configured to be separable.

The non-contact power supply device 2 includes a substantially box-shaped housing 21, and the power-supplied device 3 includes a substantially box-shaped housing 31. In FIG. 1, the upper surface of the housing 21 of the non-contact power feeding device 2 is a mounting surface (first facing surface) 22 for mounting the power supplied device 3. The portion forming the upper surface of the housing 21 is an example of a placement member. The lower surface of the casing 31 of the power supplied device 3 is a placement surface (second facing surface) 32 that faces and contacts the placement surface 22. In the example illustrated in FIG. 1, the casing 21 of the non-contact power feeding device 2 is larger than the casing 31 of the power supplied device 3, and the placement surface 22 is wider than the placement surface.

In the non-contact power supply device 2, a plurality of power supply coils 23 are two-dimensionally arranged so that the upper surface of the coil is substantially parallel to the mounting surface 22 inside (directly below) the mounting surface 22 in the housing 21. Arranged in an array. The plurality of power supply coils 23 are closely arranged so that the distance between the power supply coils 23 is substantially zero. That is, the plurality of power supply coils 23 are arranged so that the coil peripheral surfaces are in contact with each other.

A plurality of power receiving coils 33 are arranged on the power supplied device 3 so that the upper surface of the coil is substantially parallel to the placement surface 32 inside the placement surface 32 in the housing 31 (directly above). Established. The power receiving coil 33 is a power supply target that is fed by the power feeding coil 23 due to an electromagnetic induction phenomenon. The power supplied device 3 includes a load (not shown). The 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 apparatus 2 in the non-contact power supply system 1 shown in FIG. The non-contact power feeding device 2 illustrated 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 provided corresponding to the plurality of power supply coils 23, respectively.

The coil drive block B includes a feeding coil 23, a current detection 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) Q 1 and Q 2, and a capacitor C.

Note that there may be one feeding coil 23 and one coil drive block B.

FETQ1 is, for example, a P-channel FET, and FETQ2 is, for example, an N-channel FET. The power supply voltage VDD supplied from a power supply circuit (not shown) is applied to the source of the FET Q1, the drain of the FET Q1 is connected to the drain of the FET Q2, and the source of the FET Q2 is connected to the circuit ground. A connection point P1 between the FET Q1 and the FET Q2 is connected to the circuit ground via the capacitor C, the current detection unit 24, and the feeding coil 23.

In response to a control signal from the control unit 4, the gate driver circuit 251 turns on and off the FET Q1 and the FET Q2 approximately alternately at a high frequency so that when one is turned on, the other is turned off. Thereby, a high frequency voltage is generated at the connection point P1 by the FETs Q1 and Q2. The capacitor C cuts a direct current component from the high frequency voltage generated by the FETs Q 1 and Q 2 and supplies the remaining high frequency component to the power supply coil 23.

The current detection unit 24 detects the coil current I flowing through the power feeding coil 23 according to the high frequency voltage supplied by the power supply unit 25. Then, the current detection unit 24 outputs a signal indicating the current value of the detected coil current I to the control unit 4. The current detection unit 24 is a current sensor such as a shunt resistor or a Hall element.

The non-contact power supply device 2 includes the same number of coil drive blocks B configured as described above as the power supply coil 23.

The control unit 4 includes, for example, a CPU (Central Processing Unit) that executes predetermined arithmetic processing, a nonvolatile ROM (Read Only Memory) in which a predetermined control program is stored, and a volatile that temporarily stores data. It comprises a RAM (Random Access Memory) and peripheral circuits thereof. And the control part 4 is equipped with the detection part 41, the detection control part 42, the coil selection part 43, and the coil control part 44 functionally, for example by executing the control program memorize | stored in ROM, the detection part 41, detection It functions as the control unit 42, the coil selection unit 43, and the coil control unit 44.

The detection unit 41 repeatedly executes a detection process for detecting the presence or absence of the power reception coil 33 arranged at a position facing the plurality of power supply coils 23 at an execution interval set by the detection control unit 42. More specifically, for example, the detection unit 41 causes the power supply unit 25 of each coil drive block B to supply a high-frequency voltage to the power supply coil 23 (Process A). The detection unit 41 detects the coil current I of each power supply coil 23 during the period in which the current detection unit 24 of each coil drive block B supplies a high-frequency voltage to the corresponding power supply coil 23. 24 (process B). And the detection part 41 determines with a receiving coil existing in the position facing the electric power feeding coil 23 corresponding to the current detection part 24 which detected the coil current I exceeding the preset determination value (process C).

The detection unit 41 executes the detection process including the process A, the process B, and the process C corresponding to the plurality of power supply coils 23. In this way, the detection unit 41 detects the presence / absence of the power receiving coil 33 arranged at a position facing each of the plurality of power feeding coils 23. Then, the detection unit 41 repeatedly executes such detection processing corresponding to each power supply coil 23 at an execution interval corresponding to each power supply coil 23.

FIG. 3 is an explanatory diagram for explaining the inductance of the power feeding coil 23 when the power feeding coil 23 and the power receiving coil 33 are arranged to face each other in the non-contact power feeding system 1 shown in FIG. First, as shown in FIG. 3A, the feeding coil 23 and the receiving coil 33 are arranged to face each other so as to completely overlap in the example shown in FIG.

Next, a voltage is output from the power supply unit 25 and a coil current flows through the feeding coil 23 (FIG. 3B). When a coil current flows through 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 reception coil 33 (FIG. 3C).

When the flux linkage passes through the power receiving coil 33, a coil current that rotates in the reverse direction to the power feeding coil 23 flows through the power receiving coil 33 due to an electromagnetic induction phenomenon. Due to this reverse rotation coil current, an interlinkage magnetic flux in the direction opposite to the magnetic flux generated in the power feeding coil 23 is generated in the power receiving coil 33. For this reason, a current flows through the power feeding coil 23 so as to prevent the interlinkage magnetic flux generated in the power receiving coil 33 (FIG. 3D).

As described above, when the power feeding coil 23 and the power receiving coil 33 are arranged to face each other so as to overlap each other, the power feeding coil 23 alone is caused by the interaction of the magnetic circuit formed by the power feeding coil 23 and the power receiving coil 33. In this case, the current flowing through the power supply coil 23 differs between the case where the power supply coil 23 and the power reception coil 33 are arranged to face each other. Therefore, the apparent inductance of the power feeding coil 23 changes between the case where the power feeding coil 23 is a single unit and the case where the power feeding coil 23 and the power receiving coil 33 are arranged to face each other.

FIG. 4 is an explanatory diagram for explaining an interaction due to the positional relationship between the power feeding coil 23 and the power receiving coil 33 in the non-contact power feeding system shown in FIG. FIG. 5 is a graph showing an example of the relationship between the facing area of the feeding coil 23 and the receiving coil 33 and the inductance of the feeding coil 23 in the non-contact power feeding system shown in FIG.

FIG. 4A is an explanatory diagram showing a case where the position of the power feeding coil 23 and the position of the power receiving coil 33 coincide with each other on the coil axes. That is, FIG. 4A shows an example in which the power feeding coil 23 and the power receiving coil 33 are arranged to face each other so as to completely overlap each other, and the facing area between the power feeding coil 23 and the power receiving coil 33 is maximized. It is explanatory drawing.

Each coil surface of the power feeding coil 23 and the power receiving coil 33 is a plane surrounded by the outermost windings of the power feeding coil 23 and the power receiving coil 33 and is orthogonal to the interlinkage magnetic flux of the power feeding coil 23 and the power receiving coil 33. It is a plane that expands in the direction of the movement. 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 facing area between the power feeding coil 23 and the power receiving coil 33 is an area of a 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 on the coil axis, the facing area of the power feeding coil 23 and the power receiving coil 33 is maximized. When the facing area between the feeding coil 23 and the receiving coil 33 is maximized, the number of interlinkage magnetic fluxes linked to the feeding coil 23 and the receiving coil 33 is maximized, and the interaction between the feeding coil 23 and the receiving coil 33 is increased. Maximum. As a result, the inductance of the feeding coil 23 is minimized.

As shown in FIG. 4B, when the position of the power supply coil 23 and the position of the power reception coil 33 do not coincide with each other and the positions of the respective coil axes are shifted, The facing area is smaller than that shown in FIG. 4A. Therefore, the number of interlinkage magnetic fluxes linked to the power feeding coil 23 and the power receiving coil 33 decreases. For this reason, the interaction between the power feeding coil 23 and the power receiving coil 33 is reduced, and as a result, the inductance of the power feeding coil 23 is larger than that 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 are completely deviated without overlapping each other on the coil surface, the facing area of the power feeding coil 23 and the power receiving coil 33 is zero. Become. Therefore, there is no interaction between the feeding coil 23 and the receiving coil 33, and the inductance of the feeding coil 23 is maximized.

From the above, the facing area between the feeding coil 23 and the receiving coil 33 and the inductance of the feeding coil 23 have a predetermined relationship. For example, as shown in FIG. 5, the larger the coil facing area, the smaller the inductance. . Since the inductance of the feeding coil 23 and the coil facing area are in a one-to-one correspondence as shown in FIG. 5, the inductance of the feeding coil 23 is information indicating the coil facing area, and is an example of the information. It is.

6 is an explanatory diagram for explaining the relationship between the presence / absence of a power receiving coil arranged at a position facing the power feeding coil and the coil current of the power feeding coil in the non-contact power feeding system shown in FIG. . For example, as shown in FIG. 6A, when four power feeding coils 23a, 23b, 23c, and 23d are arranged in a line, the power receiving coil 33 is opposed across the power feeding coil 23b and the power feeding coil 23c adjacent to each other. Has been placed.

In the state shown in FIG. 6A, since the respective facing areas of the power feeding coils 23a and 23d with respect to the power receiving coil 33 are zero, the respective inductances of the power feeding coils 23a and 23d are large values from the graph shown in FIG. . When the inductance of the feeding 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 feeding coil 23 is expressed by the following equation (1). .

I = V / (2πfL) (1)

Therefore, the coil current I increases as the inductance decreases. Since the coil current I and the inductance have a one-to-one correspondence, the coil current I detected by the current detection unit 24 is information indicating the inductance of the feeding coil 23 and is an example of the information.

Further, the coil current I becomes larger as the facing area is larger. Since the coil current I and the facing area have a one-to-one correspondence, the coil current I detected by the current detecting unit 24 is also information indicating the facing area of the feeding coil 23, and the information It is also an example.

As described above, since the coil current I becomes smaller as the facing area is smaller, the coil current I flowing in the feeding coils 23a and 23d having the facing area of zero is smaller as shown in FIG. 6B. Become. In this way, is the power supply coil 23 facing the power receiving coil 33 so that a slightly larger current value than the coil current I flowing in the power supply coils 23a and 23d having zero facing area overlaps the coil surface? It is set in advance as a determination value for determining whether or not. On the other hand, the coil current I flowing through the power feeding coils 23b and 23c facing the power receiving coil 33 so as to overlap the coil surface is larger than the coil current I flowing through the power feeding coils 23a and 23d and larger than the determination value.

In addition, although the detection part 41 showed the example which detects the receiving coil 33 based on the electric current value of the coil current I, it is not necessarily the example which detects the receiving coil 33 based on the coil current I. For example, an optical sensor is provided in the vicinity of each power supply coil 23, and the detection unit 41 has the power-supplied device 3 (power reception coil 33) at a position facing each power supply coil 23 by the plurality of optical sensors. It may be configured to detect whether or not to do so. When the power-supplied device 3 is placed on the placement surface 22, the amount of light received by the optical sensor is reduced. Therefore, the presence or absence of placement of the power-supplied device 3 is detected by the plurality of optical sensors. The position of the power-supplied device 3 placed can be detected.

Further, the detection unit 41 may be configured to measure the inductance of each feeding coil 23 by, for example, a known inductance measuring unit. In such a case, the detection unit 41 determines that the power receiving coil 33 is present at a position facing the power feeding coil 23 where the inductance less than the inductance value corresponding to the determination value is detected.

The inductance measurement process of the optical sensor and the feeding coil 23 consumes power. However, when the detection unit 41 detects the power receiving coil based on the optical sensor and the inductance measurement, the power consumption is reduced by reducing the frequency of execution of the detection process. Can be reduced.

The detection control unit 42 causes the detection unit 41 to repeat the detection process while increasing the execution interval of the detection process by the detection unit 41 until the detection unit 41 detects the presence of the power receiving coil 33.

The coil selection unit 43 selects one or a plurality of power supply coils 23 determined by the detection unit 41 that the power reception coil 33 is present at the facing position as the excitation target coil from the plurality of power supply coils 23.

The coil control unit 44 causes the power supply unit 25 to supply a high-frequency voltage to the power supply coil selected as the excitation target coil by the coil selection unit 43, which is the power supply coils 23b and 23c in the example illustrated in FIG. Accordingly, in the example illustrated in FIG. 6, power is supplied to the power receiving coil 33 from the plurality of power feeding coils 23 b and 23 c.

Thus, if the user places the power-supplied device 3 on the placement surface 22 shown in FIG. 1, the coil selector 43 can receive the power-receiving coil without accurately positioning the power-feeding coil 23 and the power-receiving coil 33. One or a plurality of power supply coils 23 that oppose each other so as to overlap with the coil surface are selected as excitation target coils. Then, a high frequency voltage is supplied to the excitation target coil, and power is supplied from the excitation target coil to the power receiving coil 33. Accordingly, even if the power feeding coil and the power receiving coil are misaligned without accurately positioning the power feeding coil 23 and the power receiving coil 33, power can be supplied from the non-contact power feeding device 2 to the power supplied device 3. it can.

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

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

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

Next, the detection unit 41 sets the timer set value TM (i) in the timer 45 (i), and causes the timer 45 (i) to start measuring time (step S2). The timer 45 (i) times up when the time of the timer set value TM (i) has elapsed since the start of timing.

Next, the detection unit 41 determines whether or not the timer 45 (i) has expired (step S3). When the timer 45 (i) times out (YES in step S3), the detection unit 41 supplies the power supply coil 23 (i) with a high-frequency voltage to the power supply unit 25 (i) so as to start the detection process. (Step S4).

Next, the detection unit 41 compares the coil current I (i) detected by the current detection unit 24 (i) with the determination value (step S5). As a result of this comparison, when the coil current I (i) is equal to or smaller than the determination value (NO in step S5), the detection unit 41 determines that the power reception coil 33 does not exist at a position facing the power supply coil 23 (i). (Step S6). On the other hand, as a result of the comparison, when the coil current I (i) exceeds the determination value (YES in step S5), the detection unit 41 indicates that the power receiving coil 33 is present at a position facing the power feeding coil 23 (i). Determine (step S9). The above steps S4 to S6 and S9 correspond to an example of detection processing.

In step S6, when the detection unit 41 determines that the power reception coil 33 does not exist at a position facing the power supply coil 23 (i), the coil control unit 44 determines the high-frequency voltage applied to the power supply coil 23 (i). Supply is stopped by the power supply unit 25 (i) (step S7). Next, the detection control unit 42 increases the timer setting value TM (i) by adding, for example, 1 second to the timer setting value TM (i) (step S8). And the detection control part 42 transfers to step S2 to repeat the detection process by the detection part 41. FIG.

Thereby, since the detection unit 41 repeats the detection process at the time interval of the timer set value TM (i), the timer set value TM (i) corresponds to an example of an execution interval.

On the other hand, when the detection unit 41 determines in step S9 that the power reception coil 33 is present at a position facing the power supply coil 23 (i), the coil selection unit 43 selects the power supply coil 23 (i) as an excitation target coil. To do. And the coil control part 44 supplies a high frequency voltage to the power supply part 25 (i) to the electric power feeding coil 23 (i) which is an excitation object coil (step S10). As a result, the non-contact power feeding device 2 can supply power to the power-supplied device 3 in a non-contact manner.

In this case, the detection control unit 42 proceeds to step S2 to repeat the detection process by the detection unit 41 without increasing the value of the timer set value TM (i).

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 set value TM increases by 1 second in correspondence with the first to fourth detection processes in which the power receiving coil 33 is not detected. When the power receiving coil 33 is detected in the fifth detection process (YES in step S5, step S9), the timer set value TM corresponding to the fifth detection process does not increase.

As described above, the detection control unit 42 detects the detection process while increasing the execution interval of the detection process by the detection unit 41 until the detection unit 41 detects the presence of the power receiving coil 33 by the processes of steps S2 to S10. Let unit 41 repeat. As a result, as shown in Table 1, the timer set value TM (execution interval) increases as the period during which the detection unit 41 does not detect the presence of the power receiving coil 33 (the first to fourth detection processing times) continues longer. .

Increase in the detection process execution interval decreases the detection process execution frequency. Therefore, the detection control unit 42 decreases the detection processing execution frequency as the period during which the detection unit 41 does not detect the presence of the power receiving coil 33 continues longer.

The frequency of use of the non-contact power feeding device 2 (power feeding coil 23) in which the user performs non-contact power feeding by placing the power fed device 3 opposite to the non-contact power feeding device 2 depends on the circumstances of the user, the non-contact power feeding device 2 and the It varies greatly depending on the nature of the power feeding device 3. Therefore, if the frequency of use of the non-contact power supply device 2 is low and high, and the detection process is performed at the same frequency, the power receiving coil 33 faces the power supply coil 23 when the frequency of use of the non-contact power supply device 2 is low. Unnecessary power consumed when not arranged increases.

Therefore, according to the processing in steps S2 to S10, when the period during which the presence of the power receiving coil 33 is not detected by the detection unit 41 continues for a long time, that is, when the frequency of use of the non-contact power feeding device 2 by the user is considered to be low, The execution frequency of the detection process decreases. For this reason, it is easy to reduce the power consumed when the receiving coil 33 is not disposed opposite to the feeding coil 23. Even if there is only one feeding coil 23, the same effect can be obtained.

As shown in FIG. 1, when the plurality of power supply coils 23 are arranged in a matrix along the table-like placement surface 22, the user can supply the power-supplied device 3 near the center of the placement surface 22. Is likely to be placed. As a result, there is a difference in the frequency of use between the feeding coil 23 arranged near the center of the placement surface 22 and the feeding coil 23 arranged near the end of the placement surface 22. Thus, there may be a difference in the frequency of use among the plurality of power supply coils 23.

If there is a difference in the frequency of use among the plurality of power supply coils 23, if the detection processing corresponding to each power supply coil 23 is made equal in frequency, the power reception coil 33 feeds power in the power supply coil 23 with low use frequency. Unnecessary power consumed when the coil 23 is not disposed opposite to the coil 23 increases.

Therefore, by performing the processing of steps S2 to S10 for each of the power supply coils 23, the power supply coil 23 in which the period during which the presence of the power reception coil 33 is not detected by the detection unit 41 has continued for a long time, that is, the frequency of use by the user. The frequency of execution of detection processing corresponding to the feeding coil 23 that is considered to be low is reduced. As a result, it is easy to reduce the power consumed by the detection process corresponding to the power receiving coil 33 in which the power feeding coil 23 is not disposed oppositely.

In addition, although the control part 4 showed the example which performs the detection process corresponding to each electric power feeding coil 23 in parallel, the non-contact electric power feeder 2 may be provided with two or more control parts 4 corresponding to each electric power feeding coil 23. .

In step S8, the detection control unit 42 increases the timer set value TM (execution interval) by 1 second. However, the detection control unit 42 increases the timer set value TM (execution interval). , Not limited. For example, the detection control unit 42 may be configured to increase the timer set value TM (execution interval) by multiplying a preset magnification.

In addition, the detection control part 42 increases the value of timer setting value TM (i), when the detection part 41 determines with the receiving coil 33 existing in the position facing the electric power feeding coil 23 (i) (step S9). Although the example which transfers to step S2 without showing was shown, when the detection part 41 determines with the receiving coil 33 existing in the position facing the feed coil 23 (i) (step S9), the detection control part 42 is step. It may be configured to proceed to S1 and set an initial value as the timer set value TM (i).

The frequency with which the user uses the non-contact power feeding device 2 (power feeding coil 23) may change. Therefore, when the detection unit 41 determines that the power reception coil 33 is present at a position facing the power supply coil 23 (i) (step S9), the detection control unit 42 sets an initial value, that is, a timer, as the timer set value TM (i). It is preferable to set a lower limit value of the set value TM (execution interval). That is, when the presence of the power receiving coil 33 is detected by the detection unit 41, the detection control unit 42 sets the execution interval to an initial value set in advance as a lower limit value of the execution interval. After initialization, it is preferable to cause the detection unit 41 to repeat the detection process. Thereby, when a user's usage frequency increases, the timer setting value TM (execution interval) can be shortened and the detection processing execution frequency can be increased.

In addition, when the detection unit 41 determines that the power reception coil 33 is continuously present at a position facing the power supply coil 23 (i) in the detection process of the preset number of times, the detection control unit 42 42 may be configured to proceed to step S1 and set an initial value as the timer set value TM (i). That is, the detection control unit 42 initializes the execution interval when the detection unit 41 continuously detects the presence of the power receiving coil 33 while repeatedly executing the detection process a preset number of times. May be configured.

If the detection unit 41 determines that the power reception coil 33 is continuously present at a position facing the power supply coil 23 (i) in the preset number of detection processes, it can be determined that the use frequency of the user has increased. High nature. Therefore, when it can be determined with high certainty that the use frequency of the user has increased, the timer set value TM (execution interval) can be shortened, and the execution frequency of the detection process can be increased.

(Second Embodiment)
Next, the non-contact electric power feeding system 1a which concerns on 2nd Embodiment is demonstrated. The non-contact power supply system 1a includes a non-contact power supply device 2a and a power supplied device 3 (FIG. 1). The non-contact power feeding system 1a of the second embodiment is different from the non-contact power feeding system 1 of the first embodiment in the configuration of the non-contact power feeding device 2a.

FIG. 8 is a block diagram illustrating an example of the configuration of the non-contact power feeding device 2a. The non-contact power feeding device 2a shown in FIG. 8 is different from the non-contact power feeding device 2 shown in FIG. 2 in the configuration of the control unit 4a. The control unit 4a in the non-contact power feeding device 2a of the second embodiment is different from the control unit 4 in the non-contact power feeding device 2 of the first embodiment in that the operation of the detection control unit 42a and further a counter 46 are provided. A plurality of counters 46 are provided corresponding to the plurality of power feeding coils 23. Hereinafter, the counter 46 corresponding to the feeding coil 23 (i) is represented as a counter 46 (i), and the counter value CT of the counter 46 (i) is represented as a counter value CT (i).

Other configurations are the same as those of the non-contact power feeding device 2 shown in FIG. 2, and thus the description thereof will be omitted.

The detection control unit 42 a causes the detection unit 41 to repeat the detection process until the detection unit 41 detects the presence of the power receiving coil 33. When the detection process is repeated, the detection control unit 42a increases the detection process execution interval every time the detection process is repeated for a predetermined number of determinations Cj that the presence of the power receiving coil 33 is not detected. That is, the detection control unit 42a increases the execution interval every time the number of times that the presence of the power receiving coil 33 is not detected by the detection process reaches a preset number of determinations.

The counter 46 counts the number of times determined by the detection unit 41 that the power receiving coil 33 is not present.

Next, the operation of the non-contact power feeding device 2a shown in FIG. 8 will be described. FIG. 9 is a flowchart showing an example of the operation of the non-contact power feeding apparatus 2a shown in FIG.

In the flowchart shown in FIG. 9, the same steps as those in FIG. 7 are denoted by the same step numbers as those in FIG. That is, the detection control unit 42a operates in the same manner as the detection control unit 42 except for the processes in steps S101, S102, and S103.

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

Further, the detection control unit 42a adds 1 to the counter value CT (i) of the counter 46 (i) after the process of step S7 (step S102). Thereby, the detection control part 42a makes the counter 46 (i) count the frequency | count that the detection part 41 determined with the receiving coil 33 not existing in the position facing the electric power feeding coil 23 (i).

Then, after the processing of step S102, the detection control unit 42a compares the counter value CT (i) of the counter 46 (i) with the number of determinations Cj (step S103). If the counter value CT (i) is equal to the determination count Cj (YES in step S103), the detection control unit 42a proceeds to the process in step S8 and increases the timer set value TM (i). On the other hand, when the counter value CT (i) is less than the number of determinations Cj and is not equal (NO in step S103), the detection control unit 42a proceeds to the process of step S2 without increasing the timer set value TM (i). And the detection process by the detection unit 41 is repeated.

Table 2 shows an example of the operation of the non-contact power feeding device 2a when the number of determinations Cj is 2.

As described above, according to the processes in steps S1 to S10 and the processes in S101 to S103, as shown in Table 2, even if it is determined that the receiving coil 33 is not present in the process of step S6 in the first detection process, Since the counter value CT is less than the determination number Cj (= 2), the timer set value TM does not increase. In the second detection process, it is determined in step S6 that the power receiving coil 33 is absent, and the counter value CT is equal to the determination count Cj (= 2), so the timer set value TM increases from 1 second to 2 seconds. To do.

Therefore, each time the determination that the presence of the power receiving coil 33 is not detected is repeated Cj times, the timer set value TM is increased. As a result, as shown in Table 2, the timer set value TM (execution interval) increases as the period during which the detection unit 41 does not detect the presence of the power receiving coil 33 (the first to fourth detection processing times) continues longer. .

Increase in the detection process execution interval decreases the detection process execution frequency. Therefore, the detection control unit 42a decreases the execution frequency of the detection process as the period during which the detection unit 41 does not detect the presence of the power receiving coil 33 continues longer. Thereby, the non-contact electric power feeder 2a has the same effect as the non-contact electric power feeder 2.

In addition, even if the frequency of use by the user is high, the user may rarely use the non-contact power feeding device 2a (power feeding coil 23 (i)) for a long time. In such a case, if the timer setting value TM (i) (execution interval) is increased each time the detection unit 41 does not detect the power receiving coil 33, the detection process execution frequency is high despite the high use frequency of the user. Becomes lower. When the detection process is performed less frequently, the response time from when the user places the power receiving coil 33 to the power feeding coil 23 (i) to the time when power feeding is started increases. This is not desirable from the viewpoint of ensuring convenience for users with high use frequency.

On the other hand, according to each process of steps S102 and S103, the timer set value TM (i) (execution interval) is increased only when the detection unit 41 does not detect the power receiving coil 33 a plurality of times. For this reason, even when a frequently used user rarely uses the non-contact power feeding device 2a (power feeding coil 23 (i)) for a long time, an increase in the timer set value TM (i) (execution interval) is suppressed. The

In addition, although the case where the determination number Cj is 2 is illustrated, the determination number Cj may be 10 or 100, for example, and the numerical value is not limited. In the above description, an example in which the determination number Cj is a fixed value has been shown. However, the determination number Cj may be changed. For example, each time the counter value CT becomes equal to the determination number Cj, the determination number Cj may increase.

(Third embodiment)
Next, the non-contact electric power feeding system 1b which concerns on 3rd Embodiment is demonstrated. The non-contact power supply system 1b includes a non-contact power supply device 2b and a power supplied device 3 (FIG. 1). The non-contact power feeding system 1b of the third embodiment is different from the non-contact power feeding system 1 of the first embodiment in the configuration of the non-contact power feeding device 2b.

FIG. 10 is a block diagram illustrating an example of the configuration of the non-contact power feeding device 2b. The non-contact power feeding device 2b shown in FIG. 10 is different from the non-contact power feeding device 2 shown in FIG. 2 in the configuration of the control unit 4b. The control unit 4b according to the third embodiment differs from the control unit 4 in the non-contact power feeding device 2 according to the first embodiment in that the configuration and operation of the detection control unit 42b are different and that the storage unit 47 is further provided. .

Other configurations are the same as those of the non-contact power feeding device 2 shown in FIG. 2, and thus description thereof will be omitted.

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 determines whether the detection unit 41 detects the power receiving coil 33 in the detection process (based on whether the power reception coil 33 is present by the detection unit 41). The frequency at which this is detected is acquired as a detection frequency value. The execution frequency adjustment unit 422 decreases the detection process execution frequency as the detection frequency decreases.

The storage unit 47 stores the detection frequency value acquired by the detection frequency acquisition unit 421. The storage unit 47 is a non-volatile storage element such as EEPROM (Electrically Erasable and Programmable Read Only Memory) or FeRAM (Ferroelectric Random Access Memory).

Next, the operation of the non-contact power feeding 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 feeding device 2b. In the flowcharts shown in FIGS. 11 and 12, the same processes as those in FIG. 7 are denoted by the same step numbers as those in FIG. That is, the detection control unit 42b operates in the same manner as the detection control unit 42 except for 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, first, the frequency count value Cf (i) is counted for a preset reference time ts. During the period in which the frequency count value Cf (i) is counted, the timer set value TM (i) is a fixed value (for example, 1 second). The frequency count value Cf (i) is the number of times that 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. That is, the frequency count value Cf (i) is an example of information representing the detection frequency at which the detection unit 41 detects the power reception coil 33 at a position facing the power supply coil 23 (i).

The reference time ts is the execution time of the process for acquiring the detection frequency, and for example, a time such as one day or one month is used.

The detection frequency acquisition unit 421 initializes the frequency count value Cf (i) to 0 after the process 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). This elapsed time tw is the time that has elapsed since the start of the frequency acquisition process.

Hereinafter, the processing in steps S2 to S10 is the same as that in the case of excluding the processing in step S8 from FIG.

The detection frequency acquisition unit 421 compares the elapsed time tw with the reference time ts after the process of step S7 when there is no power receiving coil 33 at a position facing the power feeding coil 23 (i) (step S6) (step S6). S204). If the elapsed time tw is less than or equal to the reference time ts (NO in step S204), the detection frequency acquisition unit 421 performs the process of step S2 to repeat the detection process while fixing the timer set value TM (i) to the initial value. Migrate to

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

In step S204, when the elapsed time tw exceeds the reference time ts (YES in step S204), the detection frequency acquisition unit 421 uses the frequency count value Cf (i) at that time as information indicating the detection frequency. It memorize | stores in the memory | storage part 47, and transfers to the process of step S211.

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

First, in the process of step S211, the execution frequency adjusting 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 less than the frequency reference value Ref1 (NO in step S211), the execution frequency adjusting unit 422 determines that the detection frequency is low and sets the timer set value TM (i). For example, 10 seconds is set (step S212). Thereafter, the execution frequency adjusting unit 422 proceeds to the process 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 less than or equal to the frequency reference value Ref2, that is, when the frequency count value Cf (i) exceeds the frequency reference value Ref1 and is less than or equal to the frequency reference value Ref2 ( In step S213, NO, the execution frequency adjusting unit 422 determines that the detection frequency is medium, and sets, for example, 5 seconds as the timer set value TM (i) (step S214). Thereafter, the execution frequency adjusting unit 422 proceeds to the process of step S2.

When the frequency count value Cf (i) exceeds the frequency reference value Ref2 as a result of the comparison in step S213, that is, the frequency count value Cf (i) exceeds the frequency reference value Ref1, and the frequency reference value If Ref2 is exceeded (YES in step S213), the execution frequency adjustment unit 422 determines that the detection frequency is high, and sets, for example, 1 second as the timer setting value TM (i) (step S215). Thereafter, the execution frequency adjusting unit 422 proceeds to the process of step S2.

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

Hereinafter, the detection process is repeated based on the timer set value TM (i) set by the execution frequency adjusting unit 422 by the processes of steps S2 to S7, S9, and S10.

As described above, according to the processing shown in FIGS. 11 and 12, the frequency of detection processing is reduced when the frequency of use of the non-contact power feeding device 2 by the user is low, as in the non-contact power feeding device 2 shown in FIG. For this reason, it becomes easy to reduce the electric power consumed when the receiving coil 33 is not disposed opposite to the feeding coil 23. Even if there is only one feeding coil 23, the same effect can be obtained.

Further, as shown in FIG. 1, when a plurality of power feeding coils 23 are arranged in a matrix along the table-like placement surface 22, the user can perform the same as in the non-contact power feeding device 2 shown in FIG. 2. The execution frequency of the detection process corresponding to the power feeding coil 23 with low usage frequency can be reduced. As a result, it becomes easy to reduce the electric power consumed by the detection process corresponding to the power receiving coil 33 in which the power feeding coil 23 is not opposed.

This specification discloses various modes of technology as described above, and the main technologies are summarized below.

A non-contact power feeding device according to one aspect is a non-contact power feeding device that supplies power to a power receiving coil that is a power feeding target by an electromagnetic induction phenomenon, the power feeding coil capable of opposingly arranging the power receiving coil, and the power coil facing the power feeding coil The detection unit executes the detection process based on whether or not the detection unit that repeatedly detects the presence of the power reception coil at the position to be detected and whether the detection unit detects the presence of the power reception coil A detection control unit that adjusts the execution frequency. Further, the non-contact power feeding device according to another aspect includes a power feeding coil for feeding power to the power receiving coil by an electromagnetic induction phenomenon, and a detection process for detecting the presence or absence of the power receiving coil at a position facing the power feeding coil. A detection unit that repeatedly executes and a detection control unit that adjusts an execution frequency of the detection process that is repeatedly executed by the detection unit based on the presence or absence of the power receiving coil by the detection unit.

Such a non-contact power supply device can adjust the frequency of execution of the detection process by the detection unit based on the presence or absence of the power receiving coil by the detection unit. Therefore, in such a non-contact power feeding device, it is easy to reduce the power consumed when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect, in the above-described contactless power supply device, the detection control unit decreases the execution frequency as the period during which the detection unit does not detect the presence of the power receiving coil continues longer.

In such a non-contact power supply device, when the detection unit does not detect the presence of the power receiving coil for a long period of time, that is, when it is considered that the frequency at which the power receiving coil is disposed opposite to the power feeding coil is low, the detection processing execution frequency Decrease. As a result, in such a non-contact power feeding device, it is easy to reduce the power consumed when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect, in the above-described contactless power supply device, the detection control unit increases the detection processing execution interval to the detection unit until the detection unit detects the presence of the power receiving coil. Repeat the detection process.

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

In another aspect, in the above-described contactless power supply device, each time the detection control unit is repeated a predetermined number of times that the detection control unit is not detected to detect the presence of the power receiving coil in the detection process, A process for increasing the execution interval is executed. That is, the detection control unit increases the execution interval each time the number of times that the presence of the power receiving coil is not detected by the detection process reaches a predetermined number of determinations.

In such a non-contact power supply device, the process of increasing the execution interval is not executed unless the preset number of determinations that the presence of the power receiving coil is not detected in the detection process is repeated. Therefore, in such a non-contact power supply device, for example, when a user who uses the non-contact power supply device frequently does not use the non-contact power supply device (the receiving coil is not disposed opposite to the power supply coil). The possibility that the execution interval is increased is reduced.

In another aspect, in the above-described non-contact power feeding device, the detection control unit sets an initial value preset as a lower limit value of the execution interval when the presence of the power receiving coil is detected by the detection unit. After the execution interval is initialized by setting the execution interval, the detection unit is newly made to repeat the detection process.

In such a non-contact power feeding device, when the detection unit detects the presence of the power receiving coil, the execution interval is reset to the initial value, and the detection processing execution interval is increased until the presence of the power receiving coil is detected again. However, the detection process by the detection unit is repeated. Therefore, in such a non-contact power supply device, when the usage frequency of the user increases, it is possible to shorten the execution interval and increase the execution frequency of the detection process.

In another aspect, in the above-described contactless power supply device, when the detection control unit continuously detects the presence of the power receiving coil in the detection process a predetermined number of times, It is initialized. That is, the detection control unit initializes the execution interval when the detection unit continuously detects the presence of the power receiving coil while repeatedly executing the detection process a preset number of times.

In the detection process of the preset number of times, when the presence of the power receiving coil is continuously detected at the position facing the power feeding coil, there is a high degree of certainty that it can be determined that the use frequency of the user has increased. Therefore, in such a non-contact power supply device, when it can be determined with high certainty that the usage frequency of the user has increased, the initialization interval can be shortened and the execution frequency of the detection process can be increased.

In another aspect, in the above-described contactless power supply device, the detection control unit detects the frequency at which the detection unit detects the presence of the power reception coil based on the presence or absence of the power reception coil by the detection unit. A detection frequency acquisition unit that acquires the frequency and an execution frequency adjustment unit that decreases the execution frequency as the detection frequency decreases.

In such a non-contact power supply device, the detection frequency acquisition unit acquires the frequency at which the detection unit detects the presence of the power receiving coil, that is, the usage frequency of the user as the detection frequency. The execution frequency adjusting unit decreases the detection process execution frequency as the detection frequency decreases, that is, as the user usage frequency decreases. Therefore, in such a non-contact power feeding device, it is easy to reduce the power consumed when the power receiving coil is not disposed opposite to the power feeding coil.

In another aspect, in the above-described contactless power supply device, the power supply coil includes a plurality of coils, the detection unit performs the detection process for each of the plurality of coils, and the detection control unit includes: The execution frequency of each detection process corresponding to each coil is adjusted.

In such a non-contact power supply device, even when there is a difference in the frequency of use among a plurality of coils, the execution frequency of the detection process is adjusted corresponding to each coil. As a result, in such a non-contact power supply device, it is easy to reduce the power consumed in the detection process corresponding to the coil in which the power receiving coil is not disposed opposite to the power receiving coil.

Further, a non-contact power feeding system according to another aspect includes any of the above-described non-contact power feeding devices and a power-supplied device including the power receiving coil.

In such a non-contact power feeding system, it is easy to reduce the power consumed 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 June 1, 2012, the contents of which are included in the present application.

In order to express the present invention, the present invention has been appropriately and fully described above with reference to the drawings. However, those skilled in the art can easily change and / or improve the above-described embodiments. It should be recognized that this is possible. Accordingly, unless the modifications or improvements implemented by those skilled in the art are at a level that departs from the scope of the claims recited in the claims, the modifications or improvements are not covered by the claims. To be construed as inclusive.

According to the present invention, it is possible to provide a non-contact power supply system, a non-contact power supply device, and a power supplied device.

Claims

A power supply coil for supplying power to the power receiving coil by electromagnetic induction;
A detection unit that repeatedly executes a detection process for detecting the presence or absence of the power receiving coil at a position facing the power feeding coil;
A non-contact power feeding apparatus comprising: a detection control unit that adjusts an execution frequency of the detection process that is repeatedly executed by the detection unit based on presence or absence of the power receiving coil by the detection unit.
The contactless power supply device according to claim 1, wherein the detection control unit decreases the execution frequency as a period during which the presence of the power reception coil is not detected by the detection unit continues longer.
The detection control unit causes the detection unit to repeat the detection process while increasing an execution interval of the detection process until the detection unit detects the presence of the power receiving coil. The non-contact electric power feeder of description.
4. The non-contact according to claim 3, wherein the detection control unit increases the execution interval each time the number of times that the presence of the power receiving coil is not detected by the detection processing reaches a predetermined number of determinations. Power supply device.
The detection control unit initializes the execution interval by setting the execution interval to an initial value preset as a lower limit value of the execution interval when the detection unit detects the presence of the power receiving coil. The contactless power supply device according to claim 3, wherein the detection unit is newly made to repeat the detection process after the detection.
The detection control unit initializes the execution interval when the detection unit continuously detects the presence of the power receiving coil while repeatedly executing the detection process a preset number of times. The contactless power feeding device according to claim 5.
The detection control unit
Based on the presence or absence of the power reception coil by the detection unit, a detection frequency acquisition unit that acquires, as a detection frequency, the frequency at which the detection unit detects the presence of the power reception coil;
The contactless power supply device according to claim 1, further comprising: an execution frequency adjusting unit that decreases the execution frequency as the detection frequency decreases.
The feeding coil includes a plurality of coils,
The detection unit performs the detection process on each of the plurality of coils,
The contactless power supply device according to any one of claims 1 to 7, wherein the detection control unit adjusts an execution frequency of each detection process corresponding to each coil.
The non-contact power feeding device according to any one of claims 1 to 8,
A non-contact power feeding system comprising: a power supplied device including a power receiving coil.