JP2012257403A - Method of exciting primary coil in non-contact power supply device and non-contact power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-contact power supply device that suppresses dispersion of excitation frequencies of respective primary coils for power supply to enhance a power supply efficiency and a primary coil exciting method for the non-contact power supply device.SOLUTION: Plural primary coils are grouped into first to fourth groups G1 to G4, and unit controllers 8a to 8d each of which is provided to each of the groups G1 to G4 and collectively controls power supply unit circuits M provided in association with primary coils L1a to L1d belonging to the respective groups. A clock signal generating circuit 28 outputs a common clock signal CLK to the respective unit controllers 8a to 8d. The control circuit units of the unit controllers 8a to 8d generate synchronization signals for exciting the primary coils L1a to L1d on the basis of the common clock signal CLK, and output the synchronization signals to the power supply unit circuits M of the respective groups G1 to G4. The synchronization signals are square-wave pulse signals having the same period, so that the exciting frequencies of the primary coils L1a to L1d of the respective groups G1 to G4 are the same excitation frequency.

Description

  The present invention relates to a primary coil excitation method and a non-contact power supply apparatus in a non-contact power supply apparatus.

In recent years, various contactless power supply systems using contactless power supply technology have been proposed. In particular, practical application is progressing in a non-contact power feeding system using an electromagnetic induction method.
In a non-contact power supply system using an electromagnetic induction system, a non-contact power supply apparatus includes a plurality of primary coils arranged in parallel with a mounting surface on which an electrical device to be contactlessly supplied with power is placed. On the other hand, an electric device that receives non-contact power supply from a non-contact power supply device is provided with a power reception device, and the power reception device is provided with a secondary coil.

  Then, when the electric device is placed on the mounting surface of the non-contact power feeding device, among the plurality of primary coils provided in the non-contact power feeding device, the primary facing the secondary coil provided in the power receiving device of the electric device. A coil is selected. Then, the selected primary coil is excited and power is supplied to the secondary coil (for example, Patent Document 1).

  In the non-contact power feeding device of Patent Document 1, one oscillation circuit (resonance circuit) that drives each primary coil is used, and each primary coil is appropriately connected to the resonance circuit and excited. It has become so. Therefore, the excitation frequency of each primary coil was the same.

Japanese Patent No. 4639773

  By the way, in the non-contact power supply system, the number of primary coils for one non-contact power supply device tends to increase over a wide range of uses. In addition, a usage mode in which a plurality of non-contact power feeding devices are combined is also considered.

  When the number of primary coils for one non-contact power feeding device increases, the load increases in the non-contact power feeding device, and a plurality of oscillation circuits must be used. In a non-contact power feeding apparatus using a plurality of oscillation circuits, there are cases where selected primary coils are connected to different oscillation circuits and excited.

  At this time, the excitation frequency and amplitude value of the selected primary coil vary due to individual differences of circuit elements of each oscillation circuit, ambient temperature differences, and the like. This variation leads to variations in the secondary power supplied to the secondary coil, making it difficult to stably supply the secondary power.

  In order to stabilize the secondary power, it is conceivable to provide a smoothing capacitor with a large capacity in the power receiving device. However, the smoothing capacitor with a large capacity is expensive, leading to an increase in cost and the size of the capacitor. As a result, there is a problem that the power receiving device is enlarged. In addition, it is conceivable to use a constant voltage power supply circuit such as a three-terminal regulator in the power receiving device, but there is a problem that power loss during rectification is large and power supply efficiency is lowered.

This has the same problem even in a usage mode in which a plurality of non-contact power feeding devices are combined to feed power to a power feeding device of one electrical device.
The present invention has been made to solve the above-described problem, and an object of the present invention is to provide a non-contact power supply apparatus 1 that can suppress variation in excitation frequency of each primary coil for power supply and improve power supply efficiency. An object of the present invention is to provide a method for exciting a secondary coil and a non-contact power feeding device.

  In order to solve the above problems, a primary coil excitation method in a contactless power supply device according to the present invention includes a plurality of primary coils, and a synchronization signal is input, and the primary coil is operated at a frequency based on the synchronization signal. A method of exciting a primary coil in a non-contact power feeding device that provides a power feeding unit circuit for excitation driving for each primary coil and feeds power to the power receiving device using an electromagnetic induction phenomenon. The secondary coils are grouped into a plurality of groups, and for each of the groups, the synchronization signals having the same frequency are output to the respective primary coil power supply unit circuits belonging to the group. The plurality of primary coils are excited and driven at the same frequency.

  In order to solve the above-described problems, a contactless power supply device according to the present invention includes a power supply unit circuit that includes a plurality of primary coils and that receives a synchronization signal and excites and drives the primary coil at a frequency based on the synchronization signal. A non-contact power feeding device that is provided for each primary coil and feeds power to a power receiving device by using an electromagnetic induction phenomenon, wherein the plurality of primary coils are grouped into a plurality of groups. For each power supply unit circuit of each primary coil belonging to the set, each set is provided with one unit control unit that generates the synchronization signals having the same frequency and outputs the same. To do.

  Further, in the above configuration, it is preferable that a clock signal generation circuit that outputs a common clock signal for each unit control unit to generate a synchronization signal having the same frequency is provided for each set of unit control units. .

  Further, in the above configuration, the clock signal generation circuit is included in any one of the unit control units of each set, and a clock signal output from the unit control unit including the clock signal generation circuit to another unit control unit It is preferred that

  In order to solve the above-described problem, a contactless power supply device according to the present invention includes a plurality of primary coils, and a power supply unit circuit that excites and drives the primary coil at a frequency based on a synchronization signal that is input. A non-contact power feeding device that is provided for each primary coil and feeds power to a power receiving device by using an electromagnetic induction phenomenon, wherein the plurality of primary coils are grouped into a plurality of groups. In addition, for each primary coil power supply unit circuit belonging to the set, one unit control unit that generates and outputs the synchronization signal is provided, and the frequency of the synchronization signal generated by each unit control unit is set. A frequency comparison circuit that outputs a control signal to each unit control unit is provided so that the synchronization signals generated by each unit control unit have the same frequency compared with each other. To.

  In the above configuration, the frequency comparison circuit is generated by each unit control unit based on the sampling circuit unit that samples the synchronization signal generated by each unit control unit and the sampling signal sampled by the sampling circuit. The frequency of the synchronization signal is calculated, and the frequency of one of the calculated synchronization signals is used as a reference, and the frequency of the other synchronization signal is the same as the frequency of the reference synchronization signal. It is preferable to include a control circuit that outputs a control signal to a corresponding unit controller.

  According to the present invention, the power supply module of the non-contact power supply apparatus has a high degree of design freedom, can perform various forms of contact power supply, and can be manufactured easily and in a short time.

The whole perspective view which shows the state by which the apparatus was mounted in the electric power feeder of 1st Embodiment. Explanatory drawing which shows the arrangement | sequence state of a primary coil. The electric block circuit diagram of an electric power feeder and an apparatus. The electric block circuit diagram of the receiving circuit provided in the apparatus. FIG. 3 is an electric circuit diagram for explaining an electrical configuration of a part of the power feeding device. (A) is a waveform diagram of one synchronization signal, (b) is a waveform diagram of the other synchronization signal, and (c) is a waveform diagram of a clock signal. The electric circuit diagram explaining the electric constitution of the electric power feeder of 2nd Embodiment. The electric circuit diagram explaining the electric constitution of the electric power feeder of 3rd Embodiment. The electric block circuit diagram of a frequency comparison circuit. (A) (b) (c) is a first set of clock signals, one synchronization signal, waveform diagram of the other synchronization signal, (d) (e) (f) is a second set of clock signals, one synchronization signal (G), (h), (i) are the third set of clock signals, one synchronization signal, the waveform diagram of the other synchronization signal, and (j), (k), (l) are the waveform diagrams of the signal, the other synchronization signal. FIG. 6 is a waveform diagram of a fourth set of clock signals, one synchronization signal, and the other synchronization signal.

(First embodiment)
Hereinafter, a first embodiment embodied in a non-contact power feeding device of the present invention will be described with reference to the drawings.
FIG. 1 is an overall perspective view of a non-contact power feeding device (hereinafter simply referred to as a power feeding device) 1 and an electric device (hereinafter simply referred to as a device) E that is contactlessly powered from the power feeding device 1.

  The housing 2 of the power feeding device 1 has a rectangular bottom plate 3, side plates 4 are formed to extend upward from four sides of the bottom plate 3, and openings opened upward by the side plates 4 are made of tempered glass. It is formed by closing the plate 5. And the upper surface of the top plate 5 becomes the mounting surface 6 on which the apparatus E is mounted.

  As shown in FIG. 2, a plurality of primary coils L <b> 1 are arranged on the back surface of the top plate 5. Each primary coil L1 is 16 in this embodiment, and is arranged so that four in the X direction and four in the Y direction are arranged in parallel with the mounting surface 6 of the top plate 5.

  Further, as shown in FIG. 2, in the space formed by the bottom plate 3, the side plates 4, and the top plate 5 (within the housing 2), a power supply unit circuit M (only partly connected) is connected to each primary coil L1. Is included). Each power supply unit circuit M is electrically connected to the corresponding primary coil L1, and drives the corresponding primary coil L1 to be excited. And each primary coil L1 carries out excitation drive independently or in cooperation with the other primary coil L1, and carries out non-contact electric power feeding with respect to the apparatus E mounted in the mounting surface 6. Yes.

  Further, as shown in FIG. 2, the signal receiving antennas 7 are arranged and fixed inside the primary coils L1, respectively. Data and information are exchanged by wireless communication between the device E placed on the placement surface 6 and the corresponding power supply unit circuit M via the signal receiving antenna 7.

  In the present embodiment, for convenience of explanation, the 16 primary coils L1 arranged on the back surface of the top plate 5 are divided into two in the X direction and two in the Y direction, and four primary coils L1. Are grouped into a set. Then, in order to distinguish the primary coils L1 of the first to fourth sets G1 to G4, “a”, “b”, “c”, and “d” are added after the symbol “L1”. Accordingly, in FIG. 2, the four primary coils L1 of the first set G1 in the upper right are expressed as primary coils L1a, and the four primary coils L1 of the second set G2 in the upper left are expressed as primary coils L1b. To do. Further, the four primary coils L1 of the lower right third set G3 are described as primary coils L1c, and the four primary coils L1 of the lower left fourth set G4 are expressed as primary coils L1d. To do.

  In the device E placed on the placement surface 6 of the power feeding device 1, the signal transmission antenna 9 is wound around the secondary coil L2 outside the secondary coil L2. And when the apparatus E is mounted on the mounting surface 6 of the power feeding apparatus 1, between the signal receiving antenna 7 surrounding the primary coils L1a to L1d located immediately below and the signal transmitting antenna 9 of the apparatus E, Data and information are exchanged via wireless communication.

Next, the electrical configuration of the power feeding device 1 and the device E will be described with reference to FIG.
(Equipment E)
First, the device E will be described. In FIG. 3, the device E has a power receiving circuit 20 as a power receiving device that receives secondary power from the power feeding device 1. As illustrated in FIG. 4, the power receiving circuit 20 includes a rectifying and smoothing circuit unit 21, a DC / DC converter circuit 22, a data generation circuit unit 23, and a transmission circuit unit 24.

  The rectifying / smoothing circuit unit 21 is connected to the secondary coil L2. The rectifying / smoothing circuit unit 21 converts the secondary power excited and supplied to the secondary coil L2 by electromagnetic induction by excitation of the primary coils L1a to L1d of the power supply device 1 into a DC voltage without ripples. The DC / DC converter circuit 22 DC / DC converts the direct current voltage generated by the rectifying and smoothing circuit unit 21 into a desired voltage, and supplies the DC / DC converted direct current voltage to the load Z of the device E.

  Here, the load Z may be any device that is driven by the secondary power generated by the secondary coil L2. For example, it is a device that drives the load Z on the mounting surface 6 using a DC / DC converted DC power source, or drives the load Z on the mounting surface 6 using secondary power as it is as an AC power source. It may be a device. Moreover, the apparatus which charges the built-in rechargeable battery (secondary battery) using DC power supply which carried out DC / DC conversion may be sufficient.

In addition, the DC / DC converted direct current voltage uses the rectified direct current power source as a drive source for the data generation circuit unit 23 and the transmission circuit unit 24.
The data generation circuit unit 23 is a circuit that generates a device authentication signal ID and an excitation request signal RQ and outputs them to the transmission circuit unit 24. The device authentication signal ID is an authentication signal indicating that the device E can receive power from the power supply device 1 with respect to the power supply device 1. The excitation request signal RQ is a request signal that requests the power supply apparatus 1 to supply power.

  For example, when the rectifying / smoothing circuit unit 21 is outputting a DC power source or when the data generating circuit unit 23 can be driven by a secondary battery or the like built in the device E, the data authentication circuit ID and the excitation request A signal RQ is generated and output to the transmission circuit unit 24. Further, the data generation circuit unit 23 does not generate the device authentication signal ID and the excitation request signal RQ when the power switch for driving, for example, the load Z provided in the device E is off.

  Further, when the device E is provided with a microcomputer, the data generation circuit unit 23 does not generate the device authentication signal ID and the excitation request signal RQ when it is determined by the microcomputer that power supply is to be suspended. ing.

  The transmission circuit unit 24 is connected to the signal transmission antenna 9. The transmission circuit unit 24 receives the device authentication signal ID and the excitation request signal RQ from the data generation circuit unit 23 and transmits them to the power feeding apparatus 1 via the signal transmission antenna 9.

(Power supply device 1)
In FIG. 3, the power supply apparatus 1 includes a power supply unit circuit M for each of the primary coils L1a to L1d of each set G1 to G4, unit control units 8a to 8d for each set, and a clock signal generation circuit 28. Yes.

  In addition, in the electric power feeder 1, the electric power feeding unit circuit M with respect to each primary coil L1a-L1d of each group G1-G4 and the unit control part 8a-8d for each group are the same circuit structures, respectively. Therefore, here, for convenience of explanation, the power supply unit circuit M for the one primary coil L1a of the first group G1 and the unit controller 8a that performs overall control of the power supply unit circuit M of the first group G1 will be described.

As shown in FIG. 5, the power supply unit circuit M includes a reception circuit unit 31, a signal extraction circuit unit 32, and an excitation drive circuit unit 33.
The receiving circuit unit 31 is connected to the signal receiving antenna 7. The reception circuit unit 31 receives a transmission signal transmitted from the signal transmission antenna 9 of the device E placed on the placement surface 6 via the signal reception antenna 7. The reception circuit unit 31 outputs the received transmission signal to the signal extraction circuit unit 32.

  The signal extraction circuit unit 32 extracts the device authentication signal ID and the excitation request signal RQ from the transmission signal. When the signal extraction circuit unit 32 extracts both the device authentication signal ID and the excitation request signal RQ from the transmission signal, the signal extraction circuit unit 32 outputs the permission signal EN to the unit control unit 8a. At this time, the signal extraction circuit unit 32 adds a unit identification signal for identifying its own power supply unit circuit M together with the permission signal EN, and outputs it to the unit control unit 8a.

  Incidentally, the signal extraction circuit unit 32 outputs the permission signal EN to the unit control unit 8a when only one of the device authentication signal ID and the excitation request signal RQ is extracted, or when neither signal is extracted. do not do.

  The excitation drive circuit unit 33 is connected to the primary coil L1a, and in the present embodiment, the primary coil L1 constitutes a half bridge circuit. Therefore, the excitation drive circuit unit 33 has two switching transistors such as MOS transistors.

  The synchronization signals PS1 and PS2 shown in FIGS. 6 (a) and 6 (b), which are pulse signals for turning on and off, are respectively input from the unit controller 8a to the gate terminals of the two transistors. Yes. The synchronization signals PS1 and PS2 input to the gate terminals of the transistors are complementary signals, and when one transistor is on, the other transistor is off.

  Specifically, while the device E is placed on the placement surface 6 and the signal extraction circuit unit 32 continues to output the permission signal EN to the unit control unit 8a, the unit control unit 8a outputs the synchronization signals PS1 and PS2. Keep doing. Therefore, in this case, the excitation drive circuit unit 33 continuously drives the primary coil L1a.

  Further, when the device E is not placed on the placement surface 6, the unit controller 8a intermittently outputs the synchronization signals PS1 and PS2 for a predetermined period. Accordingly, in this case, the excitation drive circuit unit 33 intermittently drives the primary coil L1a at regular intervals.

  This intermittent excitation drive of the primary coil L1a is not secondary power that can immediately drive the load Z of the device E when the device E is mounted on the mounting surface 6, but can charge the charger of the load Z. Secondary power is supplied. Based on the charging voltage, the data generation circuit unit 23 and the transmission circuit unit 24 of the device E for performing wireless communication with the power supply apparatus 1 are driven.

  Further, in the excitation drive circuit unit 33, when the signal extraction circuit unit 32 does not output the permission signal EN, the primary coil L1a is intermittently excited in the same manner as when the device E is not mounted on the mounting surface 6. To drive.

As shown in FIG. 5, the unit controller 8 a includes a power supply circuit unit 35 and a control circuit unit 36 that controls the power supply unit circuit M in a first set.
The power supply circuit unit 35 includes a rectifier circuit and a DC / DC converter circuit. The power supply circuit unit 35 receives a power supply voltage VE from an external power supply 38 (see FIG. 3) and rectifies the rectifier circuit. The power supply circuit unit 35 converts the rectified DC voltage into a desired voltage by a DC / DC converter circuit, and then outputs the DC voltage to the control circuit unit 36 as a drive power supply.

  The control circuit unit 36 shown in FIGS. 6A and 6B outputs to the excitation drive circuit unit 33 of the power supply unit circuit M based on the clock signal CLK shown in FIG. 6C from the clock signal generation circuit 28. Synchronization signals PS1 and PS2 are generated. The control circuit unit 36 includes a flip-flop circuit, and generates one synchronization signal PS1 synchronized with the clock signal CLK from the clock signal generation circuit 28. The control circuit unit 36 inverts the generated one synchronization signal PS1 through an inverter circuit and generates the other synchronization signal PS2 together.

  In the present embodiment, the control circuit unit 36 generates the synchronization signals PS1 and PS2. However, only one of the synchronization signals PS1 may be generated and output to the excitation drive circuit unit 33 of each power supply unit circuit M. Then, in the excitation drive circuit unit 33 of each power supply unit circuit M, the other synchronization signal PS2 may be generated from the one synchronization signal PS1.

  The control circuit unit 36 receives the permission signal EN from the signal extraction circuit unit 32. The control circuit unit 36 determines which power supply unit circuit M has output the permission signal EN based on the unit identification signal added to the permission signal EN. Then, the control circuit unit 36 continues to output the synchronization signals PS1 and PS2 to the identified power supply unit circuit M, and continuously drives the primary coil L1a via the excitation drive circuit unit 33.

  Note that when the device E that can supply power and requests power supply is large in size and placed on the placement surface 6 of the power feeding device 1, two or more primary coils L1a are directly below it. May be located.

  In this case, each power supply unit circuit M corresponding to each primary coil L1a located immediately below the device E individually receives the excitation request signal RQ and device authentication signal ID of the device E, and sends them to the control circuit unit 36. Each of the enable signals EN is output.

  Based on the permission signal EN to which the module identification signal from each power supply unit circuit M is added, the control circuit unit 36 uses the same device E mounted immediately above the primary coil L1a of each power supply unit circuit M. Determine whether or not.

  At this time, when the size is large, it can be determined by the permission signal EN of each power supply unit circuit M that the primary coil L1a of each power supply unit circuit M is an aggregate of adjacent primary coils L1a without being separated.

  Then, the control circuit unit 36 simultaneously outputs the synchronization signals PS1 and PS2 to each power supply unit circuit M that is located immediately below the mounted device E and has output the excitation request signal RQ and the device authentication signal ID. .

Accordingly, the plurality of power supply unit circuits M cooperate to excite the plurality of primary coils L1 to supply power to one device E having a large size.
In addition, there may be a case where two or more devices E requesting power feeding are placed on the placement surface 6 of the power feeding device 1.

  In this case, the power supply unit circuit M corresponding to the primary coil L1 located immediately below each device E receives the excitation request signal RQ and the device authentication signal ID for the corresponding device, and sends the permission signal EN to the control circuit unit 36. Is output.

  Based on the permission signal EN to which the module identification signal from each power supply unit circuit M is added, the control circuit unit 36 mounts two or more devices E mounted directly above each power supply unit circuit M instead of one. It is determined whether it is placed.

At this time, in the case of two or more, it can be determined that each power supply unit circuit M is in a position separated from each other by the permission signal EN of each power supply unit circuit M.
Then, the control circuit unit 36 individually outputs the synchronization signals PS1 and PS2 to each of the power supply unit circuits M that are located immediately below the two or more devices E that have been placed and have output the permission signal EN. Therefore, the power supply unit circuit M corresponding to each device E excites the primary coil L1 and supplies power to each device E individually.

  Further, the control circuit unit 36 generates the synchronization signals PS1 and PS2 output to the excitation drive circuit unit 33 based on the clock signal CLK (see FIG. 6C) from the clock signal generation circuit 28. That is, the control circuit unit 36 generates the synchronization signals PS1 and PS2 synchronized with the clock signal CLK and outputs them to the excitation drive circuit unit 33. Accordingly, synchronization signals PS1 and PS2 having the same period are output to each excitation drive circuit unit 33 provided in the power supply unit circuit M of the first set of four primary coils L1a. As a result, the excitation frequency of each primary coil L1a of the first set is the same.

  The clock signal generation circuit 28 has an oscillation circuit. When the power supply voltage VE is input from the external power supply 38, the oscillation circuit oscillates and generates the clock signal CLK shown in FIG. 6C based on the oscillation signal. To do. The clock signal CLK generated by the clock signal generation circuit 28 is output to the control circuit unit 36 provided in the unit control units 8a to 8d of each group G1 to G4.

  Accordingly, synchronization signals PS1 and PS2 having the same period are output from the unit control units 8a to 8d to the excitation drive circuit unit 33 provided in each power supply unit circuit M of each group. As a result, the excitation frequencies of the primary coils L1a to L1d of the groups G1 to G4 are the same.

Next, the operation of the power feeding device 1 configured as described above will be described.
Now, when a power switch (not shown) is turned on and power is supplied to the power supply apparatus 1, the external power supply 38 supplies the clock signal generation circuit 28 of the power supply apparatus 1 and the unit controllers 8 a to 8 d of the groups G1 to G4. A power supply voltage VE is supplied.

The clock signal generation circuit 28 generates a clock signal CLK based on the power supply voltage VE from the external power supply 38, and outputs the clock signal CLK to the unit controllers 8a to 8d of the groups G1 to G4.
On the other hand, in the unit control units 8a to 8d, the power supply circuit unit 35 of the unit control units 8a to 8d receives the power supply voltage VE from the external power supply 38, respectively. Then, each power supply circuit unit 35 of the unit control units 8a to 8d converts it into a desired DC voltage, and then outputs it as a drive power to the control circuit unit 36 of the unit control units 8a to 8d, and also to the unit control unit 8a. ˜8d outputs to each feeding unit circuit M controlled.

  When the external power supply 38 is input from the power supply circuit unit 35 and the clock signal CLK is input from the clock signal generation circuit 28, the control circuit unit 36 of each of the unit control units 8a to 8d generates the synchronization signals PS1 and PS2. At this time, since the control circuit unit 36 of each unit control unit 8a to 8d generates the synchronization signals PS1 and PS2 in synchronization with the common clock signal CLK, the control circuit unit 36 of each unit control unit 8a to 8d. The periods of the synchronization signals PS1 and PS2 generated by are the same. The control circuit unit 36 of each unit control unit 8a to 8d outputs the generated synchronization signals PS1 and PS2 to each power supply unit circuit M controlled by the unit control units 8a to 8d.

  Each power supply unit circuit M controlled by each of the unit controllers 8a to 8d intermittently drives the primary coil L1 based on the synchronization signals PS1 and PS2. That is, all the primary coils L1 (L1a to L1d) of the power supply device 1 are intermittently excited to enter a standby state waiting for the excitation request signal RQ and the device authentication signal ID from the device E.

  Eventually, when the device E is placed, the device E generates a device authentication signal ID and an excitation request signal RQ, and the device authentication signal ID and the excitation request signal RQ are located immediately below the device E via the signal transmission antenna 9. Transmission is performed toward the signal receiving antenna 7 of the power feeding unit circuit M.

  The signal receiving antenna 7 receives the device authentication signal ID and the excitation request signal RQ from the device E, and the signal extraction circuit unit 32 extracts the device authentication signal ID and the excitation request signal RQ. The signal extraction circuit unit 32 outputs an enabling signal EN to the control circuit unit 36 of the unit control units 8a to 8d.

  The control circuit unit 36 of the unit control units 8a to 8d can supply power from the power supply unit circuit M directly above the primary coil L1 of the power supply unit circuit M on the basis of the permission signal EN and requests power supply. It is recognized that is placed. Then, the control circuit unit 36 of the unit control units 8a to 8d continues to output the synchronization signals PS1 and PS2 to the excitation drive circuit unit 33 of the power supply unit circuit M. Thus, the primary coil L1 at the position where the device E is placed starts continuous excitation.

  Here, the size of the device E may be large, and the primary coils L1a to L1d of the groups G1 to G4 may be located immediately below the devices E. In this case, each power supply unit circuit M corresponding to each primary coil L1a to L1d located immediately below the device E outputs an enabling signal EN to the control circuit unit 36 of the corresponding unit control unit 8a to 8d.

  And the control circuit part 36 of the unit control parts 8a-8d is a synchronous signal with respect to each electric power feeding unit circuit M of the primary coils L1a-L1d of each set G1-G4 located directly under the mounted apparatus E. PS1 and PS2 are output simultaneously.

Accordingly, the plurality of power supply unit circuits M of each of the groups G1 to G4 cooperate to excite the plurality of primary coils L1a to L1d to supply power to one large device E.
At this time, since the control circuit unit 36 of each unit control unit 8a to 8d generates the synchronization signals PS1 and PS2 in synchronization with the common clock signal CLK, the control circuit unit 36 of each unit control unit 8a to 8d The periods of the generated synchronization signals PS1 and PS2 are the same.

Therefore, the excitation frequencies of the primary coils L1a to L1d that are excited and driven by the excitation drive circuit unit 33 of the power supply unit circuit M of each of the groups G1 to G4 are the same excitation frequency.
When the primary coils L1a to L1d of the groups G1 to G4 are continuously excited at the same excitation frequency, the device E receives non-contact power supply from the power supply device 1 and drives the load Z with the secondary power. .

  Here, when the device E is removed from the mounting surface 6 or when the excitation request signal RQ disappears and the permission signal EN is no longer output, the unit controllers 8a to 8d receive a new one from the power supply unit circuit M. Wait for the enable signal EN. Then, the unit controllers 8a to 8d intermittently output the synchronization signals PS1 and PS2 to the power supply unit circuit M. As a result, the primary coil L1 is intermittently driven. That is, the apparatus waits for the excitation request signal RQ and the device authentication signal ID from the device E.

Next, the effect of 1st Embodiment comprised as mentioned above is described below.
(1) In the present embodiment, in the power feeding device 1 in which a plurality of primary coils L1 are arranged in the power feeding device 1, the plurality of primary coils are grouped into first to fourth sets G1 to G4. For each group G1 to G4, one unit control unit 8a to 8d that controls the power supply unit circuit M provided corresponding to the primary coils L1a to L1d belonging to the group is provided.

  Then, a common clock signal CLK is output from the clock signal generation circuit 28 to the unit controllers 8a to 8d provided for the respective groups G1 to G4. The control circuit unit 36 of the unit control units 8a to 8d generates synchronization signals PS1 and PS2 for exciting the primary coils L1a to L1d based on the common clock signal CLK. And it outputs to the electric power feeding unit circuit M of each group G1-G4. Since the synchronization signals PS1 and PS2 are square wave pulse signals having the same period, the excitation frequencies of the primary coils L1a to L1d of the groups G1 to G4 are the same excitation frequency.

Accordingly, the device E receives non-contact power supply from the power supply apparatus 1 in a state where the primary coils L1a to L1d are excited and driven with the same excitation frequency.
As a result, variation in secondary power supplied to the secondary coil L2 due to variations in excitation frequency of the primary coils L1a to L1d is reduced, and stable supply of secondary power can be realized.

  (2) In the present embodiment, the excitation frequencies of the primary coils L1a to L1d of the groups G1 to G4 are the same on the power feeding device 1 side. Therefore, in order to stabilize the secondary power, an expensive and large smoothing capacitor with a large capacity is provided on the device E side, or a constant voltage power supply circuit such as a three-terminal regulator with a large power loss during rectification is used. There is no need to do.

  (3) In this embodiment, the power supply circuit unit 35 is provided in the unit control units 8a to 8d of the groups G1 to G4. Therefore, the power supply circuit unit 35 of each set only needs to supply drive power to only the power supply unit circuits M belonging to the set, so that the load is reduced and the circuit scale can be reduced.

  In the present embodiment, the sixteen primary coils L1 are arranged in the power feeding device 1. However, the present invention is not limited to this, and for example, a large number of primary coils such as 20, 40, 48, 50, etc. You may apply to the electric power feeder 1 which has arrange | positioned the coil L1.

In the present embodiment, the groups are grouped into four groups G1 to G4, but may be divided into a plurality of groups other than the four groups. In this case, the greater the number of sets, the greater the effect.
Furthermore, in the present embodiment, the four primary coils L1 are set as one set, but the number is not limited to four, and a number other than four may be set as one set. In this case, the larger the number of primary coils L1 for one set, the greater the effect. At this time, the larger the number of sets, the greater the effect.

  Furthermore, in the present embodiment, each primary coil L1 of the power feeding device 1 is arranged on the top plate 5 of one casing 2, and each primary coil L1 arranged on the one casing 2 (top plate 5) is arranged. Each group was grouped into G1 to G4. This may be applied to the power supply apparatus 1 in which each set is configured as a single unit that can be separated from each other, and each set of these single units is connected to form one unit. In this case, it is necessary to provide the clock signal generation circuit 28 in any one of the single units and to output the clock signal CLK generated by the clock signal generation circuit 28 to the single unit control units 8a to 8d.

  If comprised in this way, when installing the electric power feeder 1 in wide areas, such as a floor and a wall, the electric frequency of each primary coil L1 will become the same by only connecting these single-piece | units according to a magnitude | size. Can be realized at low cost.

Of course, the clock signal generation circuit 28 is provided in advance for each of the single units. Then, when these single units are connected and implemented as one power supply device 1, one clock signal generation circuit 28 is selected and the clock signal CLK of the selected clock signal generation circuit 28 is selected. You may make it output to unit control part 8a-8d.
(Second Embodiment)
Next, a second embodiment will be described with reference to FIG.

  The first embodiment includes a clock signal generation circuit 28 that outputs a clock signal CLK to each group of unit control units 8a to 8d. On the other hand, in this embodiment, the clock signal generation circuit 28 is omitted. The present embodiment is characterized in that the clock signal CLK is generated by the control circuit unit 36 included in the unit control unit 8a of one group, for example, the first group G1.

Therefore, in the present embodiment, the same components as in the first embodiment are omitted for convenience of explanation, and only the characteristic portions will be described in detail.
In FIG. 7, the control circuit unit 36 of the unit control unit 8a of the first group G1 has an oscillation circuit similar to the oscillation circuit provided in the clock signal generation circuit 28 of the first embodiment. The oscillation circuit receives the power supply voltage VE from the external power supply 38, the oscillation circuit oscillates, and generates a clock signal CLK based on the oscillation signal. Then, based on the generated clock signal CLK, the synchronization signals PS1 and PS2 in its own unit controller 8a are generated.

  Further, the control circuit unit 36 of the unit control unit 8a outputs the generated clock signal CLK to the control circuit unit 36 provided in the unit control units 8b to 8d of the other groups G2 to G4. The control circuit unit 36 provided in each of the unit control units 8b to 8d is a circuit similar to that of the first embodiment, and generates the synchronization signals PS1 and PS2 based on the input clock signal CLK.

  As a result, the synchronization signals PS1 and PS2 having the same period are output from the unit control units 8a to 8d to the excitation drive circuit unit 33 provided in each of the power supply unit circuits M of the first to fourth groups G1 to G4. As a result, the excitation frequencies of all primary coils L1 (L1a to L1d) on the power feeding device 1 are the same.

According to the present embodiment, the same effects as those of the first embodiment can be obtained.
In the present embodiment, the clock signal CLK is generated by the unit control unit 8a of the first group G1, but the present invention is not limited to this, and any one of the control circuit units 36 of the other unit control units 8b to 8d. The clock signal may be generated by the above.

  Moreover, this embodiment arrange | positions each primary coil L1 of the electric power feeder 1 to the top plate 5 of the one housing | casing 2, and arrange | positions to the one housing | casing 2 (top plate 5) similarly to 1st Embodiment. The primary coils L1 thus obtained were grouped into groups G1 to G4. This may be applied to the power feeding apparatus 1 in which each set is configured as a single unit that can be separated from each other, and each set of these single units is connected.

  If comprised in this way, when installing the electric power feeder 1 in wide areas, such as a floor and a wall, the electric frequency of each primary coil L1 will become the same by only connecting these single-piece | units according to a magnitude | size. Can be realized at low cost.

Further, as in the first embodiment, this embodiment may be implemented by appropriately changing the number of primary coils L1, the number of sets, and the number of primary coils L1 of each set.
(Third embodiment)
Next, a third embodiment will be described with reference to FIG.

  In the second embodiment, the clock signal CLK is generated by the single control circuit unit 36. The present embodiment is characterized in that the clock signal CLK for generating the synchronization signals PS1 and PS2 is generated in the control circuit units 36 of all the unit control units 8a to 8d.

Therefore, in the present embodiment, the same components as in the second embodiment are omitted for convenience of explanation, and only the characteristic portions will be described in detail.
In FIG. 8, the control circuit unit 36 provided in the unit control units 8 a to 8 d of the groups G <b> 1 to G <b> 4 is supplied from the external power supply 38 to the power supply voltage VE, similarly to the control circuit unit 36 of the unit control unit 8 a of the second embodiment. Enter. And the control circuit part 36 of each unit control part 8a-8d produces | generates clock signal CLKa-CLKd as shown to Fig.10 (a) (d) (g) (j), respectively. Then, the control circuit section 36 of each of the unit control sections 8a to 8d is based on the respective clock signals CLKa to CLKd, and one synchronization signal as shown in FIGS. 10 (b), (e), (h), and (k). PS1a to PS1d are generated. Further, the control circuit 36 of each of the unit controllers 8a to 8d is shown in FIGS. 10 (c), (f), (i), and (l) based on one of the synchronization signals PS1a to PS1d. As shown, the other synchronization signals PS2a to PS2d are generated.

  Further, the control circuit unit 36 of each of the unit control units 8a to 8d outputs one of the generated synchronization signals PS1a to PS1d to the frequency comparison circuit 40 provided in the power feeding apparatus 1.

  Here, for convenience of explanation, one synchronization signal PS1a generated by the unit control unit 8a output to the frequency comparison circuit 40 is referred to as a “reference clock signal PS1a”. One of the synchronization signals PS1b to PS1d generated by the other unit controllers 8b to 8d output to the frequency comparison circuit 40 is referred to as “control clock signals PS1b to PS1d”.

  The reference clock signal PS1a is a clock signal whose frequency is a reference with respect to the other control clock signals PS1b to PS1d, and the control clock signals PS1b to PS1d are clock signals adjusted to the frequency of the reference clock signal PS1a.

  As shown in FIG. 9, the frequency comparison circuit 40 provided in the power feeding apparatus 1 controls the first and second selector circuits 41 and 42, the AD converter circuit 43, the memory circuit 44, and these circuits 41 to 44. A control circuit 45 comprising a microcomputer is provided.

  The first selector circuit 41 receives the reference clock signal PS1a and the control clock signals PS1b to PS1d. Under the control of the control circuit 45, the first selector circuit 41 selects and inputs a predetermined period in the order of the reference clock signal PS1a → control clock signal PS1b → control clock signal PS1c → control clock signal PS1d, and repeats this. Yes. The first selector circuit 41 outputs the reference clock signal PS1a and the control clock signals PS1b to PS1d input in this order to the AD converter circuit 43.

  The AD converter circuit 43 is an AD converter circuit with a built-in sampling circuit, and samples the reference clock signal PS1a and the control clock signals PS1b to PS1d inputted in order.

  First, the AD converter circuit 43 samples the reference clock signal PS1a, which is a square wave pulse signal shown in FIG. 10, with a sampling signal having a very short cycle. At this time, the control circuit 45 obtains the number of samplings at a high potential (high level) and the number of samplings at a low potential (low level) of the reference clock signal PS1a (square wave pulse signal). The control circuit 45 calculates the frequency of the reference clock signal PS1a based on the obtained sampling number.

  The control circuit 45 temporarily stores the calculated frequency of the reference clock signal PS1a in the memory circuit 44 made of rewritable EEPRPMO. At this time, the frequency of the reference clock signal PS1a calculated in the previous arithmetic processing and stored in the memory circuit 44 is updated to the frequency of the new reference clock signal PS1a.

  Thereafter, similarly, the AD converter circuit 43 samples the control clock signals PS1b to PS1d, and the control circuit 45 obtains the sampling number of the control clock signals PS1b to PS1d and sequentially calculates the frequencies of the control clock signals PS1b to PS1d. .

  When the frequencies of the control clock signals PS1b to PS1d are sequentially calculated, the control circuit 45 performs comparison processing between the frequencies of the control clock signals PS1b to PS1d and the frequency of the reference clock signal PS1a stored in the memory circuit 44. Do it sequentially.

  When the frequency of the reference clock signal PS1a is different from the frequency of the control clock signals PS1b to PS1d, the control circuit 45 sets the frequency of the different control clock signals PS1b to PS1d to the frequency of the reference clock signal PS1a. Execute the process.

  More specifically, for example, when the frequency of the control clock signal PS1b is different from the frequency of the reference clock signal PS1a, the control signal CTb is generated in which the frequency of the control clock signal PS1b is the frequency of the reference clock signal PS1a.

  The control clock signal (synchronization signal) PS1b is generated in synchronization with the clock signal CLKb generated by the control circuit unit 36 provided in the unit control unit 8b. Therefore, the control signal CTb is a control signal that adjusts the cycle of the clock signal CLKb generated by the control circuit unit 36 of the unit control unit 8b. The control value of the control signal CTb for this frequency difference is obtained in advance and stored in the memory in the control circuit 45.

  When the control circuit 45 generates the control signal CTb for the control clock signal (synchronization signal) PS1b of the unit control unit 8b, the control circuit 45 controls the second selector circuit 42 to connect the control circuit 45 and the unit control unit 8b, and control signal CTb Is output to the unit controller 8b. Then, the unit control unit 8b having received the control signal CTb has the control circuit unit 36 set the frequency of the clock signal CLKb to be the same as the frequency of the clock signal CLKa of the unit control unit 8a based on the control value of the control signal CTb. Adjust so that

  Therefore, the unit control unit 8b is adjusted in the control circuit unit 36 so that the frequency of the synchronization signal PS1b (synchronization signal PS2b) is the same as the frequency of the synchronization signal PS1a (synchronization signal PS2a) of the unit control unit 8a. As a result, the excitation frequencies of the primary coils L1a and L1b of the first group G1 and the second group G2 are the same.

  Further, the unit controller 8b outputs the adjusted synchronization signal PS1b to the frequency comparison circuit 40 as a new control clock signal PS1b. Accordingly, a new comparison process is performed using the new control clock signal PS1b.

  Similarly, the control clock signals PS1c and PS1d of the other unit controllers 8c and 8d are compared with the reference clock signal PS1a. If the frequencies are different, the control circuit 45 outputs the control signals CTc and CTd to the unit controllers 8c and 8d as described above, and adjusts the frequencies of the synchronization signals PS1c and PS1d.

Accordingly, the excitation frequencies of all the primary coils L1 (L1a to L1d) on the power feeding device 1 are the same.
According to the present embodiment, the same effects as those of the first embodiment can be obtained.

  In the third embodiment, the comparison between the frequency of the reference clock signal (synchronization signal) PS1a and the frequency of the control clock signals (synchronization signals) PS1b to PS1d is calculated by sampling and compared.

  From this, the rise and fall of the reference clock signal (synchronization signal) PS1a and the control clock signals (synchronization signals) PS1b to PS1d are obtained. Then, the time between each rising edge and falling edge may be measured, and the frequency may be obtained and compared.

  Further, the frequency comparison circuit 40 may be a PLL synthesizer or the like, for example, so that the control clock signals (synchronization signals) PS1b to PS1d have the same frequency as the reference clock signal (synchronization signal) PS1a.

  Moreover, this embodiment arrange | positions each primary coil L1 of the electric power feeder 1 to the top plate 5 of the one housing | casing 2, and arrange | positions to the one housing | casing 2 (top plate 5) similarly to 1st Embodiment. The primary coils L1 thus obtained were grouped into groups G1 to G4. This may be applied to the power feeding apparatus 1 in which each set is configured as a single unit that can be separated and the sets of these single units are connected to form one unit. In this case, the frequency comparison circuit 40 is provided in any one of the single units, and the frequency comparison circuit 40 is provided with the reference clock signal (synchronization signal) PS1a and the control clock signal (synchronization signal) of each unit control unit 8a to 8d. The frequencies of PS1b to PS1d are compared. Then, the frequency comparison circuit 40 needs to output the control signals CTb to CTd to the individual unit control units 8b to 8d based on the comparison result.

  If comprised in this way, when installing the electric power feeder 1 in wide areas, such as a floor and a wall, the electric frequency of each primary coil L1 will become the same by only connecting these single-piece | units according to a magnitude | size. Can be realized at low cost.

  Of course, the frequency comparison circuit 40 may be provided in advance for each of the single units. In this case, when these single units are connected and implemented as one power supply device 1, one frequency comparison circuit 40 is selected. The selected frequency comparison circuit 40 compares the frequencies of the reference clock signal (synchronization signal) PS1a and the control clock signals (synchronization signals) PS1b to PS1d. Then, the frequency comparison circuit 40 needs to output the control signals CTb to CTd to each unit control unit 8b to 8d based on the comparison result.

Further, as in the first embodiment, this embodiment may be implemented by appropriately changing the number of primary coils L1, the number of sets, and the number of primary coils L1 of each set.
In each of the embodiments, the excitation drive circuit unit 33 provided in the power supply unit circuit M is configured by a half bridge circuit including two switching transistors. However, the present invention is not limited to this, and four switching circuits are provided. A full bridge circuit composed of transistors may be used.

  Moreover, in each embodiment, the power receiving apparatus 1 is provided with the signal receiving antenna 7 for each primary coil L1 and the device E is provided with the signal transmitting antenna 9, and between the signal transmitting antenna 9 and the corresponding signal receiving antenna 7 We gave and received signals.

  The signal receiving antenna 7 provided for each primary coil L1 of the power feeding device 1 is omitted, the primary coil L1 also serves as the signal receiving antenna 7, and the signal transmitting antenna 9 of the device E is also omitted. The secondary coil L2 may also be used as the signal transmission antenna 9.

  In this case, the transmission circuit unit 24 of the device E is connected to the secondary coil L2, and the device authentication signal ID and the excitation request signal RQ generated by the data generation circuit unit 23 are transmitted through the secondary coil L2 of the power feeding device 1. Transmit to the primary coil L1. On the other hand, the receiving circuit unit 31 of the power feeding apparatus 1 is connected to the primary coil L1 and inputs the device authentication signal ID and the excitation request signal RQ from the device E received by the primary coil L1.

Thus, by comprising, the signal transmission antenna 9 and the signal receiving antenna 7 can be omitted, so that the cost can be reduced and the size can be reduced.
Further, the signal receiving antenna 7 provided for each primary coil L1 of the power supply apparatus 1 may be omitted, and the primary coil L1 may also be used as the signal receiving antenna 7, and the device E may be implemented as in the above embodiment.

  Of course, on the contrary, the power feeding apparatus 1 may be implemented with the signal transmission antenna 9 of the device E omitted and the secondary coil L2 also serving as the signal transmission antenna 9 with the above-described embodiment.

  DESCRIPTION OF SYMBOLS 1 ... Electric power feeder (non-contact electric power feeder), 2 ... Housing, 3 ... Bottom plate, 4 ... Side plate, 5 ... Top plate, 6 ... Mounting surface, 7 ... Signal receiving antenna, 8a-8d ... Unit control part, 9 ... Signal transmitting antenna, 20... Power receiving circuit, 21... Rectifying / smoothing circuit unit, 22... DC / DC converter circuit, 23... Data generating circuit unit, 24. 33 ... Excitation drive circuit unit, 35 ... Power supply circuit unit, 36 ... Control circuit unit, 38 ... External power supply, 40 ... Frequency comparison circuit, 41 ... First selector circuit, 42 ... Second selector circuit, 43 ... AD converter circuit (Sampling circuit unit), 44 ... memory circuit, 45 ... control circuit, E ... device (electrical device), M ... feeding unit circuit, Z ... load, G1 to G4 ... first group to fourth group, ID ... device authentication Signal, RQ ... Excitation request signal, E ... power supply voltage, L1, L1a to L1d ... primary coil, L2 ... secondary coil, CTb-CTd ... control signal, CLK, CLka-CLKd ... clock signal, PS1, PS2 ... synchronization signal, PS1a ... reference clock signal, PS1b to PS1d: control clock signal.

Claims (6)

Each of the primary coils is provided with a power supply unit circuit that includes a plurality of primary coils, receives a synchronization signal, and excites and drives the primary coil at a frequency based on the synchronization signal. An excitation method of a primary coil in a non-contact power feeding device that feeds power using
The plurality of primary coils are grouped into a plurality of groups, and for each group, the synchronization signals having the same frequency as each other individually for each primary coil feeding unit circuit belonging to the group. And the plurality of primary coils are driven to be excited at the same frequency. A method for exciting a primary coil in a non-contact power feeding device. Each of the primary coils is provided with a power supply unit circuit that includes a plurality of primary coils, receives a synchronization signal, and excites and drives the primary coil at a frequency based on the synchronization signal. A non-contact power feeding device that feeds power using
The plurality of primary coils are grouped into a plurality of groups, and for each group, the synchronization signals having the same frequency are generated for each group with respect to the power supply unit circuit of each primary coil belonging to the group. And the non-contact electric power feeder provided with the unit control part which outputs each one each. In the non-contact electric power feeder of Claim 2,
A non-contact power feeding apparatus, wherein a clock signal generation circuit that outputs a common clock signal for generating a synchronization signal having the same frequency is provided for each unit control unit of each set. . In the non-contact electric power feeder of Claim 3,
The clock signal generation circuit is included in any one of the unit control units of each set, and a clock signal is output from a unit control unit including the clock signal generation circuit to another unit control unit. Non-contact power feeding device. Each of the primary coils is provided with a power supply unit circuit that includes a plurality of primary coils and that is supplied with a synchronization signal and that excites and drives the primary coil at a frequency based on the synchronization signal. A non-contact power supply device that uses and supplies power,
The plurality of primary coils are grouped into a plurality of groups, and for each group, a unit controller that generates and outputs the synchronization signal to the power supply unit circuit of each primary coil belonging to the group. One by one,
Frequency comparison circuit that compares the frequency of the synchronization signal generated by each unit control unit with each other and outputs the control signal to each unit control unit so that the frequency of the synchronization signal generated by each unit control unit is the same A non-contact power feeding device characterized by comprising: In the non-contact electric power feeder of Claim 5,
The frequency comparison circuit includes:
A sampling circuit unit that samples the synchronization signal generated by each unit control unit;
Based on the sampling signal sampled by the sampling circuit, calculate the frequency of the synchronization signal generated by each unit control unit, based on the frequency of one of the calculated synchronization signals as a reference, A non-contact power feeding apparatus comprising: a control circuit that outputs a control signal having a frequency of another synchronizing signal equal to a frequency of a reference synchronizing signal to a corresponding unit controller.

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