JP2009271846A - Noncontact electric power supply system for wireless mouse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a noncontact electric power supply system capable of preventing an operation of a wireless mouse from getting disabled by an electric power supply-disabled state caused by coming-out of the wireless mouse out of a power supply capable area of a mouse pad. <P>SOLUTION: In this noncontact electric power supply system 1 for the wireless mouse, the mouse pad 2 includes a position detecting means for detecting a position of the wireless mouse 3 on the mouse pad, a plurality of power supply coils Lp1, Lp2, Lpn arranged on an operation face of the mouse pad, a power supply selection means for selecting at least one of the power supply coils corresponding to the position of the wireless mouse detected by the position detecting means, out of the plurality of power supply coils, and an electric power supply means for supplying supply electric power to the power supply coil selected by the power supply selection means, and the wireless mouse includes the first charge accumulation means for condensing induced electric power obtained by electromagnetic induction between the selected power supply coil and a power receiving coil, into an electric double layer capacitor. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a technique for supplying electric power to a wireless mouse in a contactless manner.

When operating a personal computer (hereinafter referred to as a computer) or the like, a wireless mouse (hereinafter also simply referred to as a mouse) is often used in combination with a keyboard.
This mouse does not have a connection line to connect to the USB terminal of the computer, etc., and transmits instructions from the user to the computer main body by infrared rays, etc., and supplies power for driving the mouse to use it. There is a need to.

As one method of supplying power to a mouse, a charging stand method using electromagnetic induction is known.
In this method, an electrical contact is not provided between the mouse and the charging stand, and the mouse is set on the charging stand to perform non-contact power feeding by electromagnetic induction on the secondary battery built in the mouse ( Patent Document 1).

  However, since it is necessary to incorporate a secondary battery for storing the power supplied to the inside of the mouse, the battery voltage suddenly drops due to the problem of operability due to the weight of the battery and the drooping characteristics of the battery voltage. There is a risk of interruption of unnecessary work.

  Therefore, a system using a mouse pad has been proposed as a non-contact power feeding system using electromagnetic induction. This is because power is supplied from the USB terminal of the computer to the mouse pad, and the supplied power is electromagnetically induced from one power supply coil embedded in the entire circumference (edge) of the mouse pad as shown in FIG. To supply power to the power receiving coil incorporated in the mouse.

  Regarding the non-contact power feeding method using electromagnetic induction, a plurality of power feeding coils, a non-power feeding coil, and a position detection circuit for the non-power feeding device are provided to give freedom to placing the non-power feeding device and a plurality of power feeding devices. An apparatus capable of supplying power simultaneously is disclosed (see Patent Document 2).

JP 2004-222491 A JP 2006-149168 A

  However, the technology for supplying the power necessary for driving the mouse from one power supply coil embedded in the entire circumference (edge) of the mouse pad includes a power storage unit for storing the power required for driving inside the mouse. Therefore, if the mouse is out of the power supply area of the mouse pad, power for driving the mouse cannot be supplied, and there is a problem if the mouse cannot be operated.

  However, the technique described in Patent Document 2 is a technique for increasing the degree of freedom for placing the power-supplied device by detecting the position of the power-supplied device, and simultaneously supplying power to a plurality of electronic devices. It does not fundamentally solve the problem.

  The present invention has been made in view of the above circumstances, and prevents the wireless mouse from being unable to operate because the wireless mouse is out of the power supply area of the mouse pad. An object of the present invention is to provide a non-contact power feeding system that can perform the above.

The above problem is solved by the following means.
(1) The operation of the wireless mouse is performed by using the electric power supplied from the power supply unit provided on the mouse pad by electromagnetic induction between the power feeding coil provided on the operation surface of the mouse pad and the power receiving coil provided on the wireless mouse. In the non-contact power feeding system configured to perform non-contact power feeding as power for use, the mouse pad includes a detecting means for detecting a position of the wireless mouse on the mouse pad and a plurality of mouse pads disposed on the operation surface of the mouse pad. A feeding selection means for selecting at least one feeding coil corresponding to the position of the wireless mouse detected by the position detection means from among the plurality of feeding coils, and the feeding selection means Power supply means for supplying power for supply to the selected power supply coil, and the wireless mouse has the selected power supply. Contactless power supply system of the wireless mouse, characterized by comprising a first storage means for storing electric induction power obtained by electromagnetic induction between the coil and the receiving coil.

(2) The position detection means includes position detection means for selecting one by one from a plurality of power supply coils in order, and supplies position detection power to the power supply coil selected by the position detection selection means. The wireless mouse non-contact power feeding system according to item (1), wherein the position of the wireless mouse is detected based on a change in the terminal voltage of the power feeding coil.
(3) The wireless mouse non-contact power feeding system according to any one of (1) and (2), wherein the first power storage unit is an electric double layer capacitor.

(4) The wireless mouse non-contact power feeding system according to any one of (1) to (3), wherein the power feeding coil has a polygonal shape.
(5) The wireless mouse non-contact power feeding system according to any one of (1) to (3), wherein the power feeding coil has a circular shape.

(6) In the preceding item, a drive circuit is provided in which power feeding coils are arranged at each intersection of matrix-like wirings, and first selection means and second selection means are connected for each row and column wiring. A wireless mouse non-contact power feeding system according to any one of 1) to (5).

(7) The wireless mouse further includes a power amount determination unit that determines whether or not a predetermined amount of power is supplied to the first power storage unit, and the predetermined amount of power is supplied to the first power storage unit by the power amount determination unit. A transmission means for transmitting a signal to that effect to the mouse pad when it is determined that the signal has been received, the mouse pad further receiving a signal to the effect that a predetermined amount of power has been supplied to the first power storage means Any one of (1) to (6), further comprising: a first control unit that interrupts power supply to the wireless mouse when receiving a signal indicating that a predetermined amount of power has been supplied to the first power storage unit A wireless contactless power supply system for wireless mice.

(8) The wireless mouse has a second power storage unit that can store more power than the first power storage unit, and a determination unit that determines whether or not a predetermined amount of power is supplied to the first power storage unit and the second power storage unit. The power storage switching means for switching the power storage destination from the first power storage means to the second power storage means when the first power storage means has reached the predetermined power amount, and the second power storage means has the predetermined power amount. A transmission means for transmitting a message indicating that power supply has been stopped to the mouse pad when it is determined that
From the preceding paragraph (1), the mouse pad includes receiving means for receiving a power supply stop notification from the transmitting means, and second control means for interrupting power supply to the wireless mouse when receiving a power supply stop notification ( 7) A wireless mouse non-contact power feeding system according to any one of 7).

(9) From the preceding paragraphs (1) to (8), the position detection power supplied to the power supply coil by the position detection means is smaller than the power supply supplied to the power supply coil by the power supply means. The wireless mouse non-contact power feeding system according to any one of the above.

According to the invention described in (1) above, the position of the wireless mouse on the operation surface of the mouse pad is detected, and the wireless mouse is electromagnetically induced from at least one feeding coil corresponding to the position-detected wireless mouse. Inductive power is supplied, and the induced power is stored in the first power storage means of the wireless mouse.
Thereby, it is possible to prevent the operation of the wireless mouse from being disabled due to power being not supplied because the wireless mouse is out of the power supply area of the mouse pad.

According to the invention described in item (2), the position of the wireless mouse can be detected based on the change in the terminal voltage of the feeding coil.
According to the invention described in the preceding item (3), by setting the first power storage means as an electric double capacitor, the time until it can be used, in other words, the power supply time is shortened compared to the conventional power storage means. Therefore, work efficiency is improved. Moreover, since stable charge / discharge behavior is exhibited in a wider temperature range than conventional secondary batteries, a stable mouse can be used without being affected by changes in the surrounding environment. In addition, since the cycle life is longer than conventional secondary batteries and deep charge / discharge of 500,000 to 1 million times is possible, there is less need for maintenance. Furthermore, since it does not contain heavy metals, the environmental impact at the time of disposal is extremely small.
According to the invention described in item (4), the shape of the feeding coil can be a polygon. Thereby, for example, the feeding coil having a high feeding effect can be arranged by making the shape of the feeding coil a regular hexagon.
According to the invention described in item (5) above, the feeding coil can be easily formed by forming the feeding coil into a circular shape.

According to the invention described in item (6) above, the number of component parts can be reduced by using the first selection means and the second selection means for each row and column wiring in a matrix (lattice) in the mouse pad. Can be saved.
According to the invention described in (7) above, when the first power storage means of the mouse reaches a predetermined voltage, a signal to that effect is transmitted to the mouse pad, and the mouse pad that has received the message stops power feeding. . Thereby, it is possible to prevent power loss due to continued power supply from the mouse pad to the wireless mouse even though the first power storage means has reached a predetermined voltage.

According to the invention described in item (8) above, when power feeding is started, first, power is stored in the first power storage unit, and when the first power storage unit reaches a predetermined voltage, Is switched to the second power storage means. As a result, power is first stored in the first power storage means having a smaller amount of power that can be stored than the second power storage means, so that the wireless mouse can be used in a short time. In addition, when the first power storage means reaches a predetermined voltage, the power storage destination is switched to the second power storage means, so even if the wireless mouse leaves the power supplyable area, it can be used in that state for a long time. It becomes possible.
According to the invention described in the preceding item (9), the power supplied to the power feeding coil at the time of position detection is made smaller than the power supplied to the power feeding coil when power is supplied to the wireless mouse, so that high charging is performed at the time of power feeding. Capability is ensured, and an excellent energy saving effect can be obtained during position detection.

The best mode for carrying out the invention according to the claims of the present application (hereinafter simply referred to as “the present invention”) will be described below with reference to the drawings.
The configuration of the non-contact power feeding system 1 according to the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing a schematic configuration of a contactless power supply system 1, and the contactless power supply system 1 includes a mouse pad 2 and a mouse 3 as shown in the figure.
The mouse pad 2 is used for a user to use the mouse 3 satisfactorily, and includes a control unit 21, a pad unit 22, and the like. The mouse pad 2 is connected to a USB terminal or an AC adapter of the computer, and obtains power via the USB terminal or the AC adapter to supply the mouse 3 with operating power.

The control unit 21 comprehensively controls the entire mouse pad 2, which will be described later in detail.
The pad unit 22 is an area where the user operates the mouse 3, and is laid out two-dimensionally so that n feeding coils Lp1 to Lpn having a square shape are in close contact with each other. Used when supplying power. In the present embodiment, the shape of the power supply coils Lp1 to Lpn is described as a square, but may be a polygon such as a rectangle or a regular hexagon, or a circle.

  The mouse 3 is an input device used for a user to operate a pointer or an icon displayed on a screen such as a display connected to a computer. A mouse unit power receiving coil Lm (details will be described later) is provided. The details are described later.

FIG. 2 is a view showing a cross section of the mouse pad 2.
As shown in FIG. 2, the mouse pad 2 is two-dimensionally arranged on the base material 25 so that the n power supply coils Lp1 to Lpn are in close contact with each other as described above, and is protected by the surface protection material 26. ing.
Further, position detection on the pad portion 22 of the mouse 3 and supply of induced power to the position-detected mouse 3 are performed by electromagnetic induction of any one of the feeding coils Lp1 to Lpn and the mouse portion power receiving coil Lm. .

Next, a schematic configuration of the mouse pad 2 will be described with reference to FIG.
FIG. 3 shows a block diagram of the mouse pad 2.
As shown in FIG. 3, the mouse pad 2 includes a control unit 21, a position selection unit 32, a power supply selection unit 33, a power supply unit 34, and power supply coils Lp1 to Lpn as described above.

As described above, the control unit 21 controls the entire mouse pad 2 as a whole, and also includes a pulse oscillator 35 and is used as position detection means for detecting the position of the mouse 3.
The pulse oscillator 35 oscillates a pulse having a predetermined frequency when detecting the position of the mouse 3 or supplying power to the mouse 3.

  The position selection unit 32 is used as position detection selection means, and includes n transistors Trd1, Trd2, Trd4,..., Trdn (hereinafter referred to as position detection transistors), and performs position detection. One of the power supply coils for supplying position detection power to the power supply coils Lp1 to Lpn is selected.

  The power supply selection unit 33 is used as power supply selection means and includes n transistors Trp1, Trp2, Trp3,..., Tpn (hereinafter also referred to as power supply operation transistors Trp1, Trp2, Trp3,..., Tpn). When feeding the mouse 3 whose position is detected, one of the feeding coils Lp1 to Lpn is selected from among the feeding coils Lp1 to Lpn.

The power supply coils Lp <b> 1 to Lpn are used when detecting the position of the mouse 3 operated on the pad unit 22 and supplying electric power to the detected mouse 3 by electromagnetic induction.
The power supply unit 34 obtains a direct current from a computer via a USB terminal or the like and supplies power for driving each unit.

  Next, how to lay the power supply coils Lp1 to Lpn on the pad portion 22 will be described with reference to FIG.

(A) is the case where the shape of the feeding coil is a regular hexagon, (b) is a diagram showing an arrangement example when the shape of the feeding coil is a square, and (c) is a case where the shape of the feeding coil is a circle. It is.
In (a) and (b), there is almost no magnetic field blank region (hereinafter referred to as a dead zone), but when the feeding coil in (c) is circular, a large dead zone exists.

  Further, (d) and (e) are respectively electromagnetic couplings between the feeding coil and the mouse portion receiving coil Lm when the shape of the feeding coil is a square and the position of the coil in the adjacent row is not shifted. The degree comparison is shown.

In the case of (e), the degree of electromagnetic coupling between the power feeding coil and the mouse unit power receiving coil Lm is higher in the case of (e) than in the case of (d). The power transmission efficiency to the power receiving coil Lm is also increased.
Even when a large number of circular feeding coils are arranged in rows and columns as shown in (f), if the positions of the coils in adjacent rows are not shifted as shown in (c), Compared to, dead zone can be reduced.

From the above, in order to increase the degree of electromagnetic coupling with the mouse portion power receiving coil Lm and reduce the dead zone as much as possible, it is better to arrange the power feeding coils so as to be closely adjacent. Therefore, it is most preferable that the shape of the feeding coil is a regular hexagon, but it may be other polygons, squares, rectangles, ellipses, or circles.
In the present embodiment, the shape of the feeding coil is described as a square as described above.

Example 1
Next, Example 1 will be described.
FIG. 5 is a diagram illustrating a circuit configuration of the mouse 3 used in the first embodiment.
As shown in FIG. 5, the mouse 3 includes a mouse circuit 40 and a mouse power supply unit 41.
The mouse circuit 40 is a circuit for demonstrating the function as a wireless mouse other than the power supply unit 41. However, since the mouse operation transmission method and the like included in this circuit are well-known techniques, a detailed description is omitted here. To do.

The power supply unit 41 supplies power for driving the mouse 3.
As shown in FIG. 5, the power supply unit 41 includes a mouse unit power receiving coil Lm, a constant voltage circuit 42, an EDLC 43, an overcharge prevention circuit 44, a diode 45, an overvoltage prevention circuit 46, a rectifier circuit 47, and a resonance capacitor 48. It has. Note that the mouse portion power receiving coil Lm is disposed on the bottom surface of the mouse 3 in order to increase the degree of electromagnetic coupling with the power feeding coils Lp <b> 1 to Lpn.

The constant voltage circuit 42 is a DC-DC converter, and converts the voltage across the terminals of the EDLC 43 that varies in proportion to the amount of accumulated charge into a constant voltage and supplies it to the load.
The EDLC 43 is an electric double-layer capacitor and stores inductive power obtained by electromagnetic induction.

The overcharge prevention circuit 44 prevents charges from gradually accumulating in the EDLC 43 and the voltage between the terminals from exceeding the rated voltage.
The diode 45 prevents the current from flowing backward.
The overvoltage prevention circuit 46 prevents the power supply voltage to the EDLC 43 from exceeding the rated voltage of the EDLC 43.

The rectifier circuit 47 converts an alternating current generated in the mouse unit power receiving coil Lm into a direct current to be stored in the EDLC 43.
The resonance capacitor 48 is for improving the transmission efficiency of the inductive power transmitted from the feeding coil to the mouse portion receiving coil Lm, and a series resonance circuit is formed by the mouse portion receiving coil Lm and the resonance capacitor 48. Constitute.

  When there is no need to improve the transmission efficiency, the resonance capacitor 48 need not be connected. However, it is easier to detect the position of the coil Lm for receiving the mouse portion by configuring the resonance circuit. Inductive power that can be stored in the EDLC 43 also increases.

で求められる。
但し、Ｌはマウス部受電用コイルＬｍのインダクタンスを、ｆはパルス発振器３５から発振されるパルス波の周波数をそれぞれ表す。 The capacitance C of the resonance capacitor 48 is

Is required.
Here, L represents the inductance of the mouse unit power receiving coil Lm, and f represents the frequency of the pulse wave oscillated from the pulse oscillator 35.

  In this embodiment, the series resonance circuit is configured. However, the resonance capacitor 48 may be inserted in parallel with the mouse unit power receiving coil Lm to configure the parallel resonance circuit.

Next, the circuit configuration of the pad section 22 will be described with reference to FIG.
As shown in FIG. 6, the pad portion 22 includes position detection transistors Trd1, Trd2, Trd3,..., Trdn, power supply operation transistors Trp1, Trp2,. Ra, R, a position detection mode transistor Tra, a diode D, and a capacitor C are provided.

Terminal A and terminal B are connected to a USB terminal of a computer or the like, and a DC voltage is supplied to the circuit through these terminals.
The terminal Ap is connected to the pulse oscillator 35, and the terminal Vx is connected to the control unit 21, respectively.
The position detection mode transistor Tra is a transistor used when detecting the position of the mouse 3, in other words, detecting the position of the mouse unit power receiving coil Lm, and supplies a pulse signal to the power feeding coils Lp1, Lp2,. To do.

The resistor Ra is a resistor for limiting the current flowing through each of the power feeding coils Lp1, Lp2,..., Lpn during the position detection operation.
The diode D prevents current from flowing backward and performs half-wave rectification.
The resistor R and the capacitor C constitute a smoothing circuit.

Next, the mechanism of circuit operation will be described.
When a DC voltage supplied from a computer USB terminal or the like is applied to the A terminal and the B terminal, the control unit 21 first detects the position of the mouse 3, in other words, the position of the mouse part power receiving coil Lm. Any one of the position detection transistors Trd1, Trd2, Trd3,..., Trdn is turned on and the rest are turned off.

Then, the pulse signal shown in FIG. 7A is applied from the pulse oscillator 35 to the Ap terminal. As a result, the position detection mode transistor Tra is switched, and a position detection pulse signal having the same waveform as in FIG. 7A is input to one of the feeding coils Lp1, Lp2,..., Lpn.
Thereafter, the position of the mouse unit power receiving coil Lm is detected by a method described later.
Next, when the position of the mouse unit power receiving coil Lm is detected, the control unit 21 selects one of the power supply operation transistors Trp1, Trp2, Trp3,..., Trpn according to the position of the mouse unit power receiving coil Lm. Turn the rest off except for one.

Next, depending on the position of the mouse unit power receiving coil Lm, the pulse signal shown in FIG. 7A is sent from the pulse oscillator 35 to any one of the power supply operation transistors Trp1, Trp2, Trp3,. Is applied. As a result, a pulse signal having the same waveform as that shown in FIG. 7A is input to one of the feeding coils Lp1, Lp2,..., Lpn, and electric power is supplied to the mouse portion receiving coil Lm by electromagnetic induction. The

The current value required when detecting the position of the mouse may be smaller than the current value required when supplying power to the mouse. That is, the power consumption of the system can be suppressed by making the current value of the pulse signal that flows through the power feeding coil when detecting the position of the mouse smaller than the current value that flows through the power feeding coil when performing power feeding.
Therefore, the value of the base resistance Ra of the position detection mode transistor Tra is set so that the current value of the pulse signal flowing through each power supply coil during the position detection operation is smaller than the current value flowing through each power supply coil during the power supply operation. Largely set.

Next, the procedure for detecting the position of the mouse 3 and supplying power will be described in association with the flowchart shown in FIG.
First, when a DC voltage supplied from a USB terminal of a computer or the like is applied to the A terminal and the B terminal in order to determine whether or not the mouse unit power receiving coil Lm exists on the power supply coil Lp1, it is constant. , Trdn except for the position detection transistor Trd1 are turned off, and all the power supply operation transistors Trp1, Trp2,. A control signal for turning off Trp3,..., Trpn is applied from the control unit 21 to the base of each transistor (step S4). On the other hand, a control signal for turning on only the position detection transistor Trd1 is applied from the control unit 21 to the base of the position detection transistor Trd1 (step S5).

Next, the pulse signal shown in FIG. 7A is applied from the pulse oscillator 35 to the Ap terminal, and the position detection pulse signal having the same waveform as the pulse signal shown in FIG. 7A is input only to the feeding coil Lp1. (Step S6).
When a position detection pulse signal having the same waveform as the pulse signal shown in FIG. 7A is input to the feeding coil Lp1 for a certain position detection time Td (step S7), the voltage across the terminals of the feeding coil Lp1 is changed. A voltage value Vx at both ends of the feeding coil Lp1 rectified by the half-wave rectifier circuit including the diode D, the resistor R, and the capacitor C and the smoothing circuit is acquired by the control unit 21.

The controller 21 compares the voltage value Vx with the preset reference voltage value Vr (step S10).
The reference voltage value Vr is Vx ≧ Vr when the mouse part power receiving coil Lm is not present on the selected power feeding coil, while the reference voltage value Vr is when the mouse part power receiving coil Lm is present on the selected power feeding coil. The impedance is changed by electromagnetic induction between the power feeding coil and the mouse portion power receiving coil Lm, and is set to a value such that Vx <Vr.

In the case of FIG. 6, since the mouse part power receiving coil Lm does not exist on Lp1, Vx ≧ Vr as shown in FIG. 7B, so that the control part 21 has the mouse part power receiving coil Lm on Lp1. It is determined that it does not exist (“NO” in step S10).
Next, in order to determine whether or not the mouse portion power receiving coil Lm exists on the power feeding coil Lp2, all the position detecting transistors Trd1 and Trd3 other than the position detecting transistor Trd2 for a certain time Td. ,..., Trdn is turned off, all the power supply operation transistors Trp1, Trp2, Trp3,..., Trpn are turned off (step S4), and only the position detection transistor Trd2 is turned on. (Step S5).

Thereafter, the pulse signal shown in FIG. 7A is applied from the pulse oscillator 35 to the Ap terminal, and the position detection pulse signal having the same waveform as the pulse signal shown in FIG. 7A is inputted only to the feeding coil Lp2. (Step S6).
In the same manner as described above, the control unit 21 obtains the voltage value Vx obtained by rectifying the voltage between the terminals of the feeding coil Lp2 by the half-wave rectifier circuit including the diode D, the resistor R, and the capacitor C and the smoothing circuit. Is done.

The control unit 21 compares the acquired voltage value Vx with the reference voltage value Vr (step S10).
In the case of FIG. 6, since the mouse part power receiving coil Lm exists on the power feeding coil Lp2, the inductance is changed by electromagnetic induction between the power feeding coil Lp2 and the mouse part power receiving coil Lm, as shown in FIG. Thus, Vx <Vr.
The control unit 21 determines that the mouse unit power receiving coil Lm exists on the power feeding coil Lp2, stops the position detection operation, and shifts to the power feeding operation.

  Next, in order to supply power from the power supply coil Lp2 by electromagnetic induction, the control unit 21 turns off all the position detection transistors Trd1, Trd2, Trd3,... Trdn, and performs all power supply operations except the power supply operation transistor Trp2. A control signal for turning off the transistors Trp1, Trp3,... Trpn is applied to the base of each transistor (step S11).

  After that, the same pulse signal shown in FIG. 7A as that used for detecting the position of the mouse portion power receiving coil Lm is maintained for a certain period of time Tc (hereinafter also referred to as power feeding time). DC power input to the base (step S12) and supplied from the USB terminal to the B terminal is converted into a power supply pulse signal and supplied to the power supply coil Lp2.

A magnetic field is generated when a current flows through the feeding coil Lp2, and a potential difference is generated in the mouse part power receiving coil Lm due to the influence of the magnetic field, and the power feeding coil Lp2 and the mouse part power receiving coil Lm are generated for a certain feeding time Tc. Power is supplied by electromagnetic induction.
In the mouse 3, pulse power (high-frequency power) generated at both ends of the mouse unit power receiving coil Lm is rectified by the rectifier circuit 47 and stored in the EDLC 43 via the overvoltage prevention circuit 46.

  Note that the current of the power supply pulse signal flowing into each power supply coil during the power supply operation needs to be larger than the current of the position detection pulse signal in the case of the position detection operation. The base resistance values of Trp2, Trp3,..., Trpn are set to be smaller than the base resistance values of the position detection transistors Trd1, Trd3,.

Next, after the power supply time Tc has elapsed (step S13), the control unit 21 supplies the power supply pulse signal having the same waveform as the pulse signal shown in FIG. 7A supplied to the power supply operation transistor Trp2. Stop (step S14).
Then, in order to determine whether or not the mouse unit power receiving coil Lm is still on the power feeding coil Lp2, the control unit 21 performs position detection transistors Trd1, Trd3,..., Trdn other than the position detection transistor Trd2. , And all power supply operation transistors Trp1, Trp2, Trp3,..., Trpn are turned off (step S4), and a control signal for turning on only the position detection transistor Trd2 is applied to each transistor (step S5). ).

Next, the pulse signal of FIG. 7A is applied from the pulse oscillator 35 to the Ap terminal, and the position detection pulse signal having the same waveform as the pulse signal shown in FIG. 7A is input to the feeding coil Lp2. The (Step S6)
Thereafter, the control unit 21 determines whether or not the mouse unit power receiving coil Lm exists on the power feeding coil Lp2 in the same manner as described above.
If it is determined that the mouse portion power receiving coil Lm is continuously present on the power feeding coil Lp2, the power feeding operation described above is repeated on the power feeding coil Lp2. FIG. 9 shows the state of signals related to the above operation.

  On the other hand, if it is determined that the mouse unit power receiving coil Lm does not exist on the power feeding coil Lp2, the control unit 21 determines whether or not the mouse unit power receiving coil Lm exists on the power feeding coil Lp3. All the position detection transistors Trd1, Trd2, Trd4,..., Trdn other than the transistor Trd3 are turned off, all the power supply operation transistors Trp1, Trp2, Trp3,... Trpn are turned off, and the position detection transistor Trd3. Send a control signal to turn ON only.

Next, the pulse signal of FIG. 7A is applied from the pulse oscillator 35 in the control unit 21 to the Ap terminal, and whether the mouse unit power receiving coil Lm exists on the power supply coil Lp3 in the same manner as described above. Make a decision. FIG. 10 shows signal states related to the operation in this case.
Thereafter, the position detection and the power feeding operation are performed by repeatedly performing the above-described operation.

Next, the operation of the control unit 21 when performing the above operation will be described with reference to the flowchart shown in FIG.
The control unit 21 assigns 0 to the variable i (step S1), adds 1 to the value assigned to the variable i (step S2), and the value assigned to i is spread on the pad unit 22. In order to determine whether or not the number of feeding coils is exceeded, it is determined whether or not the value of i is equal to the value of n + 1 (step S3). Note that, as described above, the number of feeding coils laid on the pad portion 22 is n.

  If the value assigned to i is equal to the value of n + 1 (“YES” in step S3), the value assigned to the variable i exceeds the number of power supply coils spread on the pad portion 22. Then, the process returns to step S1 in order to determine whether or not the mouse portion power receiving coil Lm exists on the power feeding coil Lp1.

  On the other hand, when the value assigned to i is not equal to the value of n + 1 (“NO” in step S3), in order to determine whether or not the mouse portion power receiving coil Lm exists on the power feeding coil Lpi. All the position detection transistors and all the power supply operation transistors except the position detection transistor Trdi are turned off (step S4), and the position detection transistor Trdi is turned on (step S5).

  Next, the control unit 21 inputs a pulse signal to the Ap terminal by oscillating the pulse signal shown in FIG. 7A from the pulse oscillator 35 (step S6), and waits until Td time elapses (step S7). ).

  After the elapse of Td time, the control unit 21 acquires the voltage value Vx across the feeding coil Lpi (step S8), stops the input of the pulse signal to the Ap terminal, and turns off the position detection mode transistor Tra (step S9). Then, it is determined whether or not the acquired voltage value Vx is larger than the reference value Vr (step S10).

If Vx ≧ Vr (“NO” in step S10), the mouse part power receiving coil Lm is not on the power feeding coil Lpi, so the process returns to step S2 to continue to detect the position of the mouse part power receiving coil Lm.
On the other hand, when Vx <Vr (“YES” in step S10), since the mouse part power receiving coil Lm is on the power feeding coil Lpi, all power is supplied from the power feeding coil Lpi to the mouse part power receiving coil Lm. The position detection transistors are turned off, and all the power supply operation transistors except the power supply operation transistor Trpi are turned off (step S11).

Next, when a pulse signal from the pulse oscillator 35 is input to the base of the power supply operation transistor Trpi (step S12), power supply is started from the power supply coil Lpi and waits until the time Tc elapses (step S13).
During this time, inductive power is supplied to the mouse 3 by electromagnetic induction between the feeding coil Lpi and the mouse portion power receiving coil Lm.
After the Tc time has elapsed, the control unit 21 turns off the power supply operation transistor Trpi in order to stop the power supply (step S14), and returns to step S4.

  Next, a specific example of the non-contact power feeding system 1 according to the present invention will be described with reference to FIGS. 11 and 12.

Here, the numerical values of the respective circuit elements of the mouse pad 2 and the mouse 3 are set as follows.
(1) About the circuit elements of the mouse pad 2 (i) As the feeding coils Lp1 to Lpn, a square air-core coil having an inner side of 17.5 mm, an outer side of 24 mm, and an average inductance of 18.3 [μH] is used as shown in FIG. A total of 33 pieces are arranged on the plane of the pad portion 22 so that there are 5, 6, 5, 6, 5, and 6.
(Ii) The oscillation frequency of the pulse oscillator 35 in the control unit 21 is set to 125 [kHz].

(2) Circuit elements of mouse 3 A commercially available optical wireless mouse is used as mouse 3, and the numerical values of the respective circuit elements constituting power supply unit 41 are set as follows.
(I) A circular air-core coil having an inner diameter of 14.5 mm, an outer diameter of 31.45 mm, and an inductance of 148.8 [μH] is used as the mouse portion power receiving coil Lm.
(Ii) The capacitance of the resonance capacitor 48 is set to 0.01 [μF].

(Iii) As the EDLC 43, two electric double layer capacitors having a rated voltage of 2.3 [V] and a capacitance of 120 [F] are connected in series. Therefore, the voltage of the EDLC 43 when charging is completed is 4.6 [V] (= 2.3 [V] × 2).
(Iv) A DC-DC converter is used as the constant voltage circuit 42, and the set output voltage is set to 1.5 [V] in accordance with the input rated voltage of the existing mouse circuit 40.

FIG. 12 shows temporal transitions of the voltage of the EDLC 43 and the output voltage of the DC-DC converter when the mouse 3 is left in the center on the plane of the pad portion 22 and charged while the EDLC 43 is completely discharged. It is a thing.
As shown in FIG. 12, about 8 minutes after the start of charging, the output of the DC-DC converter becomes 1.5 [V] of the set output voltage, and it can be seen that the mouse 3 is usable at this point. .

  Further, about 1 hour after the start of charging, the voltage of the EDLC 43 becomes 4.6 [V] in the fully charged state. From this point on, the voltage of the EDLC 43 is maintained at 4.6 [V] by the overcharge prevention circuit 44.

  FIG. 13 shows that after the EDLC 43 is completely discharged until the output voltage of the DC-DC converter reaches the set output voltage of 1.5 [V], the mouse is left at the center on the pad portion 22 plane, and then the mouse 3 is moved. The figure shows the temporal transition of the voltage of the EDLC 43 and the output voltage of the DC-DC converter when the battery is operated and continuously used, for example, while charging and discharging are continued while searching the Internet.

  As shown in FIG. 13, the output voltage of the DC-DC converter became 1.5 [V], which is the set output voltage, in about 8 minutes from the start of charging as in FIG. Thereafter, the voltage of the EDLC 43 also increases during the Internet search, and it is confirmed that the battery is sufficiently charged even while operating the mouse 3.

Further, the overcharge prevention circuit 44 shows that the voltage of the EDLC 43 does not exceed 4.6 [V] which is the full charge voltage.
As described above, the position of the mouse 3 on the mouse pad 2 is always detected, the feeding coil closest to the detected mouse 3 is selected, the EDLC 43 of the mouse 3 is fed, and power is stored. Is done.

  As a result, even when the mouse 3 is out of the power supply area of the mouse pad 2, the power necessary for driving the mouse 3 is supplied from the EDLC 43, so that the mouse 3 can supply power to the mouse pad 2. By deviating from the area, it is possible to prevent power from being supplied to the mouse 3 and the operation of the mouse 3 from being disabled.

Further, one feeding coil for feeding power is selected from the feeding coils Lp1 to Lpn according to the position of the mouse 3 whose position is detected, and the mouse part power receiving coil Lm of the mouse 3 is selected from the selected feeding coil. Power is supplied by electromagnetic induction.
As a result, when power is supplied, power can be supplied from the power supply coil located closest to the detected mouse 3, so that waste of power can be prevented and efficient power supply can be achieved.

Moreover, the following effects can be obtained by using an electric double layer capacitor as the power storage means of the wireless mouse.
First, since the electric double layer capacitor is lighter than the secondary battery, the operability is superior to a mouse having a built-in secondary battery, such as a conventional wireless mouse.
Second, since secondary batteries are chemically charged and discharged, it is difficult to charge and discharge with a large current, but electric double layer capacitors are physically charged without chemical changes during charging and discharging. Rapid charge and discharge of large current becomes possible. As a result, as compared with the secondary battery, the time until the battery can be used, in other words, the power supply time is shortened, so that the work efficiency is improved.

Third, since stable charge / discharge behavior is exhibited in a temperature range wider than that of the secondary battery, a stable mouse can be used without being affected by changes in the surrounding environment.
Fourth, the cycle life of secondary batteries is generally shortened by repeated deep charge / discharge, but electric double layer capacitors have a longer cycle life than secondary batteries and can be charged / discharged deep 500,000 to 1 million times. It is.
Fifth, since a heavy metal is not included like a secondary battery, an environmental load becomes small.

(Example 2)
Next, a second embodiment of the non-contact power feeding system 1 according to the present invention will be described with reference to the drawings.
In the circuit of the pad portion 22 used in the first embodiment, two types of transistors, that is, a position detection transistor and a power supply operation transistor are used. In this embodiment, a circuit in which the number of transistors to be used is reduced by sharing the position detecting transistor and the power supply operation transistor is configured.

A circuit configuration of the pad portion 22 of the mouse pad 2 will be described with reference to the drawings.
FIG. 14 is a diagram illustrating a circuit configuration of the pad unit 22.
As shown in FIG. 14, the pad portion 22 includes service transistors Tr1, Tr2, Tr3,..., Trn, power supply coils Lp1, Lp2, Lp3,..., Lpn, resistors R, Ra, Rb, position detection mode transistor Tra, power supply mode. A transistor Trb, a diode D, and a capacitor C are provided.

The in-service transistors Tr1, Tr2, Tr3,..., Trn are transistors having both functions of position detection and power feeding.
The position detection mode transistor Tra is the same as in the first embodiment, and performs the position detection pulse having the same waveform as the pulse signal of FIG. 7A output from the pulse oscillator 35 when detecting the position of the mouse power receiving coil Lm. This is a transistor for supplying a signal to any one of the feeding coils Lp1, Lp2, Lp3,..., Lpn.

  The power supply mode transistor Trb supplies power supply coils Lp1, Lp2, Lp3 with power supply pulse signals having the same waveform as the pulse signal of FIG. 7A output from the pulse oscillator 35 when power is supplied to the mouse unit power receiving coil Lm. ,..., Lpn.

The A terminal and the B terminal are connected to a USB terminal or the like of the computer, and a DC voltage supplied from the USB terminal or the like is applied.
The pulse signal shown in FIG. 7A output from the pulse oscillator 35 in the control unit 21 is applied to the Ap terminal and the Bp terminal.
The resistor Ra controls the value of the current flowing through the power supply coil when detecting the position.
The resistor Rb controls the current value that flows through the power supply coil during power supply.

  In addition, the electric power consumed by the mouse pad 2 is suppressed by making the electric power for position detection supplied to the power supply coil when performing position detection smaller than the electric power for supply supplied to the power supply coil when performing electric power supply. can do. Therefore, the value of the base resistance Ra of the position detection mode transistor Tra is set to the value of the base resistance Rb of the power supply mode transistor Trb so that the current value of the position detection pulse signal is smaller than the current value of the power supply operation pulse signal. It is set larger than

Since the diode D, the resistor R, and the capacitor C are the same as those in the first embodiment, description thereof is omitted here.
Next, the mechanism of the position detection and power feeding operation of the mouse unit power receiving coil Lm will be described with reference to the flowchart shown in FIG. It is assumed that the mouse unit power receiving coil Lm is on the power feeding coil Lp2 as in the first embodiment.

  First, in order to detect the position of the mouse 3, in other words, the mouse unit power receiving coil Lm, the control unit 21 turns on the transistor Tr1 for a certain time Td, and all the shared transistors Tr2, except the transistor Tr1, A control signal for turning off Tr3,..., Trn and turning off the power supply mode transistor Trb is applied to the base of each transistor.

  In this state, a pulse signal similar to that shown in FIG. 7A output from the pulse oscillator 35 is applied to the Ap terminal to switch the position detection mode transistor Tra. As a result, the DC voltage applied to the terminal A becomes a position detection pulse signal having the same waveform as in FIG. 7A and is input only to the feeding coil Lp1.

  Next, when a position detection pulse signal having the same waveform as in FIG. 7A is input only to the feeding coil Lp1, the voltage between the terminals of the feeding coil Lp1 is half-wave rectified including a diode D, a resistor R, and a capacitor C. A voltage value Vx rectified by the circuit and the smoothing circuit is acquired by the control unit 21.

The controller 21 compares the acquired voltage value Vx with a preset reference voltage value Vr.
In the case of FIG. 14, the mouse part power receiving coil Lm does not exist on the power feeding coil Lp1, so that Vx> Vr as shown in FIG. 7B, and the control part 21 causes the mouse part power receiving coil to be placed on the power feeding coil Lp1. It is determined that Lm does not exist.

  Next, in order to determine whether or not the mouse unit power receiving coil Lm is present on the power feeding coil Lp2, the control unit 21 turns on the shared transistor Tr2 for a certain time Td and feeds coils other than the shared transistor Tr2. , And a control signal for turning off the power supply mode transistor Trb is applied to the base of each transistor.

  In this state, a pulse signal similar to that shown in FIG. 7A oscillated from the pulse oscillator 35 is applied to the Ap terminal in FIG. 14, and the position detection mode transistor Tra is switched to thereby apply the direct current applied to the terminal A. The voltage is a pulse signal for position detection having the same waveform as in FIG. 7A and is input only to the feeding coil Lp2.

Thereafter, the voltage between the terminals of the feeding coil Lp2 is rectified by a half-wave rectifier circuit and a smoothing circuit including the diode D, the resistor R, and the capacitor C, and the voltage value Vx is acquired by the control unit 21.
The control unit 21 performs the magnitude of the acquired voltage value Vx and a preset reference voltage value Vr.

  In the case of FIG. 14, since the mouse part power receiving coil Lm is present on the power feeding coil Lp2, Vx <Vr as shown in FIG. 7C, so that the control unit 21 receives the mouse part power receiving on the power feeding coil Lp2. It is determined that the working coil Lm is present, the position detection operation is stopped in order to perform power feeding, and the power feeding operation is started.

  Next, the control unit 21 turns on the shared transistor Tr2, turns off the shared transistors Tr1, Tr3,..., Trn other than the shared transistor Tr2, and turns off the position detection mode transistor Tra. Apply to.

  In this state, a pulse signal similar to that shown in FIG. 7A output from the pulse oscillator 35 is applied to the Bp terminal for a certain power supply time Tc, and is applied to the terminal B by switching the power supply mode transistor Trb. The DC voltage thus obtained becomes a power supply pulse signal having the same waveform as in FIG. 7A and is input only to the power supply coil Lp2.

As a result, electromagnetic induction generates a high-frequency current having the same frequency as the power supply pulse signal from the power supply coil Lp2 to the mouse portion power reception coil Lm, and power is supplied in a non-contact manner.
The high frequency current generated at both ends of the mouse unit power receiving coil Lm is rectified by the rectifier circuit 47, passed through the overvoltage prevention circuit 46, and then stored in the EDLC 43.

  In addition, since the current of the pulse signal for power supply flowing through each of the power supply coils Lp1 to Lpn during the power supply operation requires a larger current than that in the position detection operation, the value of the base resistance Rb of the power supply mode transistor Trb It is set smaller than the base resistance Ra of the detection mode transistor Tra.

  Next, after a certain power supply time Tc has elapsed, the shared transistor Tr2 is turned ON again from the control unit 21, and all the shared transistors Tr1, Tr3,..., Trn connected to the power supply coils other than the shared transistor Tr2 are turned on. A control signal that turns off and turns off the power supply mode transistor Trb is applied to the base of each transistor.

  In this state, a pulse signal similar to that shown in FIG. 7A is applied from the pulse oscillator 35 to the Ap terminal in FIG. 14 for a fixed position detection time Td, and the position detection mode transistor Tra is switched to thereby switch the terminal A. The DC voltage applied to is a pulse signal for position detection having the same waveform as in FIG. 7A, and is input only to the feeding coil Lp2.

Thereafter, the control unit 21 determines whether or not the mouse unit power receiving coil Lm exists on the power feeding coil Lp2 in the same manner as described above.
That is, if the control unit 21 determines that the mouse unit power receiving coil Lm is again on the power feeding coil Lp2, the power feeding operation is repeated again.
FIG. 16 shows the state of signals related to the operation at this time.

On the other hand, if it is determined that the mouse part power receiving coil Lm does not exist on the power supply coil Lp2, the process proceeds to determination of whether or not the mouse part power receiving coil Lm exists on the power supply coil Lp3, which is the next power supply coil of the power supply coil LP2.
That is, the control unit 21 turns on the shared transistor Tr3 for a certain position detection time Td, and all the shared transistors Tr1, Tr2, Tr4,... Except the shared transistor Tr3 connected to the power feeding coils Lp1 to Lpn. , Trn and a control signal for turning off the power supply mode transistor Trb are applied to the base of each transistor.

In the same manner as described above, the control unit 21 determines whether or not the mouse unit power receiving coil Lm exists on the power feeding coil Lp3.
FIG. 17 shows a signal state related to the operation at this time.
Subsequently, the position detection and power feeding of the mouse portion power receiving coil Lm are performed by repeating the above-described operation.

Next, operation | movement of the control part 21 is demonstrated using the flowchart shown in FIG.
The control unit 21 assigns 0 to the variable i (step S21), adds 1 to the value assigned to the variable i (step S22), and the value assigned to i is spread on the pad unit 22. In order to determine whether or not the number n of feeding coils is exceeded, it is determined whether or not the value of i is equal to the value of n + 1 (step S23).

If the value assigned to i is equal to the value of n + 1 (“YES” in step S23), the value assigned to the variable i exceeds the number of power supply coils spread, and the first power supply coil In order to determine whether or not there is a mouse unit power receiving coil Lm on Lp1, the process returns to step S21.
On the other hand, if the value assigned to i is not equal to the value of n + 1 (“NO” in step S23), all the transistors except the common transistor Tri and the position detection mode transistor Tra are turned off (step S24). The shared transistor Tri is turned on (step S25).

Next, the control unit 21 transmits a pulse signal from the pulse oscillator 35 to input the pulse signal to the Ap terminal to switch the position detection mode transistor Tra (step S26), and the signal is output until the position detection time Td elapses. Is oscillated (step S27).
After the elapse of the position detection time Td, the control unit 21 acquires the voltage value Vx (step S28), turns off the position detection mode transistor Tra by stopping the input of the pulse signal to the Ap terminal (step S29), It is determined whether or not the acquired value of Vx is greater than the reference value Vr (step S30).

If Vx ≧ Vr (“NO” in step S30), the mouse unit power receiving coil Lm is not on the power feeding coil Lpi, so the process returns to step S22 and the position of the mouse unit power receiving coil Lm is subsequently detected.
On the other hand, when Vx <Vr (“YES” in step S30), the mouse unit power receiving coil Lm is on the power feeding coil Lpi, and the common transistor Tri and the power feeding mode transistor are used to feed power to the mouse unit power receiving coil Lm. All the transistors except Trb are turned off (step S31), and only the common transistor Tri is turned on (step S32).

Next, the pulse signal from the pulse oscillator 35 is input to the Bp terminal, the power supply mode transistor Trb is switched (step S33), and the pulse signal is input until the power supply time Tc elapses (step S34).
During this time, inductive power is supplied to the mouse 3 by electromagnetic induction between the feeding coil Lpi and the mouse portion power receiving coil Lm.
After the power supply time Tc has elapsed, the power supply mode transistor Trb is turned off (step S35), power supply is stopped, and the process returns to step S24.
As described above, according to this embodiment, the number of transistors to be used can be reduced.
As a result, the cost for manufacturing the mouse pad 2 can be reduced.

(Example 3)
Next, a third embodiment of the non-contact power feeding system according to the present invention will be described with reference to the drawings.
In the first and second embodiments, when the electric double layer capacitor in the mouse 3 reaches a predetermined voltage, the overcharge prevention circuit 44 prevents overcharge. However, since the power supply from the mouse pad 2 to the mouse 3 is continued, the overcharge prevention circuit constantly works and power loss occurs.

In the present embodiment, communication between the mouse pad 2 and the mouse 3 is performed in order to prevent this power loss, so that when the electric double layer capacitor reaches a predetermined voltage, the mouse pad 2 to the mouse 3 is connected. The power supply is stopped.
The circuit configuration of the mouse 3 will be described with reference to FIG.

As shown in FIG. 18, the mouse 3 includes a mouse circuit 40 and a power supply unit 41a.
The power supply unit 41a includes a constant voltage circuit 42, an EDLC 43, a full charge detection circuit 44a, a diode 45, an overvoltage prevention circuit 46, a rectifier circuit 47, a resonance capacitor 48, a mouse unit power receiving coil Lm, and an infrared light emitting diode 50. Yes.

The full charge detection circuit 44a prevents the EDLC 43 from being overcharged, and outputs a full charge detection signal which is a signal indicating that when the EDLC 43 reaches a predetermined voltage.
The infrared light emitting diode 50 is arranged on the front surface of the mouse 3 as shown in FIG. 19, and receives the full charge signal from the full charge detection circuit 44a indicating that the EDLC 43 has reached a predetermined voltage. Is output.

Further, the control unit 21 of the mouse pad 2 is provided with an infrared receiving module 50 a as shown in FIG. 19, and receives infrared rays output from the infrared light emitting diode 50 of the mouse 3. Since the circuit configuration of the mouse pad 2 other than the above is the same as that of the third embodiment, the description of the circuit configuration is omitted here.
Next, the mechanism of the circuit operation will be described with reference to the flowchart shown in FIG.
When the supply of power from the mouse pad 2 to the mouse 3 is started, the supplied power starts to be stored in the EDLC 43.

When the EDLC 43 reaches a predetermined voltage, a full charge detection signal is output by the full charge detection circuit 44a, thereby driving the infrared light emitting diode 50.
The infrared light emitting diode 50 outputs infrared rays, thereby communicating with the infrared receiving module 50a provided in the control unit 21, and transmitting that the EDLC 43 has reached a predetermined voltage (full charge detection signal). The

When the control unit 21 receives that fact (full charge detection signal) (“YES” in step S56), the control unit 21 stops the power supply to the A terminal and the B terminal (step S57), and as a result, the power supply to the mouse 3 is stopped. The
FIG. 20A is a diagram illustrating power supply and power supply stop of the control unit 21 in time series.
As shown in FIG. 20A, when the control unit 21 receives a full charge signal during power supply, the control unit 21 stops power supply to the A terminal and the B terminal for a certain time, and as a result, power supply to the mouse 3 is stopped. . After a predetermined time has elapsed, the control unit 21 starts to supply power to the pad unit 22 again.

  As shown in FIG. 20B, the full charge detection circuit 44a of the mouse 3 measures the voltage of the EDLC 43 and outputs a full charge detection signal when full charge occurs. In addition, the voltage of the EDLC 43 is set to the set voltage. In the following case, the control unit 21 may restart the power supply by outputting a power supply request signal for requesting the start of power supply from the mouse 3 to the control unit 21 of the mouse pad 2.

Next, the operation of the control unit 21 when performing the operation shown in FIG. 20A will be described with reference to the flowchart shown in FIG.
The control unit 21 assigns 0 to the variable i (step S41), adds 1 to the value assigned to the variable i (step S42), and the value assigned to i is spread on the pad unit 22. In order to determine whether or not the number n of feeding coils is exceeded, it is determined whether or not the value of i is equal to the value of n + 1 (step S43).

  If the value assigned to i is equal to the value of n + 1 (“YES” in step S43), the value assigned to variable i exceeds the number of power supply coils spread, and the first coil pad From step S41, the process returns to step S41.

  On the other hand, if the value assigned to i is not equal to the value of n + 1 (“NO” in step S43), it is determined whether or not the mouse portion power receiving coil Lm exists on the i th power supply coil Lpi. Therefore, all the transistors except the common transistor Tri and the position detection mode transistor Tra are turned off (step S44), and only the common transistor Tri is turned on (step S45).

Next, the control unit 21 inputs a pulse signal to the Ap terminal by transmitting a pulse signal from the pulse oscillator 35 to switch the position detection mode transistor Tra (step S46), and waits until time Td has elapsed (step S46). S47).
The control unit 21 acquires the voltage Vx (step S48), stops inputting the pulse signal to the Ap terminal, turns off the position detection mode transistor Tra (step S49), and the value of the voltage Vx exceeds the reference value Vr. It is determined whether or not (step S50).

If Vx ≧ Vr (“NO” in step S50), the mouse part power receiving coil Lm is not on the power feeding coil Lpi, so the process returns to step S42, and the position of the mouse part power receiving coil Lm is continuously detected.
On the other hand, if Vx <Vr (“YES” in step S50), the mouse unit power receiving coil Lm is on the power feeding coil Lpi, and the common transistor Tri is used to feed power from the power feeding coil Lpi to the mouse unit power receiving coil Lm. All the transistors except the power supply mode transistor Trb are turned off (step S51), and only the common transistor Tri is turned on (step S52).

Next, by inputting a pulse signal from the pulse oscillator 35 to the Bp terminal, the power supply mode transistor Trb is switched (step S53) and waits until the power supply time Tc elapses (step S54). During this time, power is supplied by electromagnetic induction between the mouse portion feeding coil Lm and the feeding coil Lpi.
When the power supply is completed, the power supply mode transistor Trb is turned off (step S55), and it is determined whether or not a full charge signal is received from the infrared light emitting diode 50 (step S56).
If the full charge signal has not been received, sufficient power has not yet been supplied to the EDLC 43, and the process returns to step S44 to continue the position detection operation and the power supply operation.

On the other hand, when a full charge signal is received (YES in step S56), sufficient power is supplied to the EDLC 43, and power supply beyond this is a waste of power, so voltage application to the A terminal and the B terminal is not allowed. Stop (step S57) and wait until a predetermined time has elapsed (step S58).
During this time, power supply to the A terminal and B terminal is stopped, and as a result, power supply to the mouse 3 is stopped.
Next, after a predetermined time has elapsed, application of voltage to the A terminal and the B terminal is started (step S59), and the process returns to step S44 to start the position detection operation and the power feeding operation.

Next, the power supply unit of a commercially available optical wireless mouse was replaced with the power supply unit shown in FIG. 18, and a mouse was constructed using the same circuit elements as in the first example.
However, two EDLCs with a rated voltage of 2.7 [V] and a capacitance of 16 [F] were connected in series as the EDLC 43 for power storage. The reason why the electrostatic capacity of the EDLC for power storage is made smaller than that in the first embodiment is to make the mouse 3 usable in as short a time as possible from the start of charging.

Accordingly, the full charge voltage of the EDLC 43 is 5.4 [V] (= 2.7 [V] × 2). However, considering the variation in the capacitance of each EDLC, the voltage for determining full charge is 5.1 [V below the rated voltage. ] Was set. (Hereafter, this voltage is referred to as the full charge voltage).
The set output voltage of the DC-DC converter as the constant voltage circuit 42 is set to 1.5 [V] in accordance with the input rated voltage of the mouse circuit (existing) in FIG.

Further, the same rectangular air-core coil as that of Example 1 was used as the feeding coil, and the arrangement thereof was also arranged as shown in FIG.
The oscillation frequency of the pulse oscillator 35 was also set to 125 [kHz] as in the first embodiment.
FIG. 22 shows the voltage of the EDLC 43 and the DC− that is the constant voltage circuit 42 when the mouse 3 is left in the center on the plane of the pad portion 22 and charged when the EDLC 43 in the mouse 3 is completely discharged. The time transition of the output voltage of a DC converter is represented.

FIG. 22 shows that the output of the DC-DC converter becomes 1.5 [V] of the set output voltage after 2 minutes and 30 seconds from the start of charging, and the mouse is in a movable state at this point.
Further, 13 minutes and 36 seconds after the start of charging, the voltage of the EDLC 43 becomes 5.1 [V] which is the full charge voltage, and after this time, the voltage of the EDLC 43 is held at this voltage by the overcharge prevention circuit 44. It is confirmed. Note that the EDLC voltage pulsates in the vicinity of 5 [V] because the EDLC is fully charged and the power supply to the A terminal and the B terminal is stopped until a predetermined time elapses. This is because after the power is slightly consumed in the circuit, the power supply to the A terminal and the B terminal is resumed and the operation of storing power is repeated.

  FIG. 23 shows that the mouse 3 is moved from the state where the EDLC 43 for power storage in the mouse 3 is completely discharged until the output voltage of the DC-DC converter as the constant voltage circuit 42 becomes 1.5 [V] which is the set output voltage. After being left in the center on the plane of the pad unit 22, the voltage of the EDLC 43 and the DC-DC that is the constant voltage circuit 42 when charging / discharging is continued while operating the mouse 3 and continuously searching the Internet. The time transition of the output voltage of the converter is shown.

  23, as in FIG. 22, after 2 minutes and 30 seconds from the start of charging, the output voltage of the DC-DC converter as the constant voltage circuit 42 becomes the set output voltage 1.5 [V], and then during the Internet search However, the voltage of the EDLC 43 is increased, and it is confirmed that the battery is sufficiently charged even while the mouse 3 is operated. Further, the overcharge prevention circuit 44 shows that the voltage of the EDLC 43 does not exceed the full charge voltage of 5.1 [V].

As described above, whether or not the EDLC 43 has reached a predetermined voltage is determined, and if it is determined that the EDLC 43 has reached the predetermined voltage, that fact is transmitted to the mouse pad 2 and the position detection operation and The power feeding operation is interrupted.
As a result, it is possible to prevent power loss caused by continuing power supply from the mouse pad 2 to the mouse 3 even though the electric double layer capacitor in the mouse 3 has reached a predetermined voltage. .

Example 4
Next, a fourth embodiment of the non-contact power feeding system according to the present invention will be described with reference to the drawings.
In the circuit configuration of FIG. 14 shown in the second embodiment, the number of transistors connected to the feeding coil is about half that in the circuit configuration of FIG. 6 shown in the first embodiment.

  However, also in the circuit configuration shown in FIG. 14, each of the power supply coils is connected to one transistor that has both the position detection switching function and the power supply switching function. Therefore, the same number of transistors for both the position detection selection means and the power supply selection means as the power supply coils are required, and the control unit 21 of the mouse pad 2 needs the same number of output terminals for control signals. . As a result, the number of transistors increases in proportion to the number of power supply coils.

  In this embodiment, in addition to both the position detection switching function and the power feeding switching function, the number of transistors is reduced by arranging transistors having both a column selection function and a row selection function, and at the same time, the output of the control unit The number of terminals is also reduced.

The circuit configuration of the mouse pad 2 used in this embodiment will be described with reference to the drawings.
FIG. 24 is a diagram showing the circuit configuration of the mouse pad 2. As shown in the figure, resistors R, Ra, Rb, position detection mode transistor Tra, power supply mode transistor Trb, row selection transistors Trr1, Trr2, Trr3,. , Trrm, column selection transistor transistors Trc1, Trc2, Trc3,..., Trcn, feeding coils Lp11,..., Lpmn, diode D, and capacitor C.

The row selection transistors Trr1, Trr2, Trr3,..., Trrm are transistors that are used as position detection selection means and power supply selection means, and designate a row of the power supply coil.
The column selection transistors Trc1, Trc2, Trc3,..., Trcn are transistors that are used as a position detection selection unit and a power supply selection unit and designate a column of the power supply coil.

  The resistors R, Ra, Rb, the position detection mode transistor Tra, the power supply mode transistor Trb, and the power supply coils Lp11,..., Lpmn are the same as those in the above embodiment, and thus detailed description thereof is omitted here.

  As shown in FIG. 24, “row” wiring and “column” wiring connected in a mesh pattern between the power supply and the ground are assembled in a matrix (grid shape), and one feeding coil is provided at the intersection of the row wiring and the column wiring. A circuit is formed by connecting the row selection transistors connected to each other and connected to the “row” wiring and the column selection transistors connected to the “column” wiring.

In FIG. 24, when a position detection pulse signal or a power supply pulse signal is input to Lp11, the row selection transistor Trr1 and the column selection transistor Trc1 may be turned on, and the other row selection transistors and column selection transistors may be turned off. When a position detection pulse signal or a power supply pulse signal is input to Lp12, the row selection transistor Trr1 and the column selection transistor Trc2 may be turned on, and the other row selection transistors and column selection transistors may be turned off.
Note that the operation of the control unit 21 related to the position detection function and the power supply function of the mouse unit power receiving coil Lm in the circuit configuration of FIG. 24 is the same as that of the second embodiment, and therefore detailed description thereof is omitted here.
In the present embodiment, a function of stopping the power supply from the pad portion 22 may be provided as in the third embodiment.

  With the circuit configuration as described above, a specific feeding coil can be selectively driven by a small number of transistors by combining the row selection transistor and the column selection transistor to turn on and off.

(Example 5)
Next, a fifth embodiment of the non-contact power feeding system according to the present invention will be described with reference to the drawings.
In this embodiment, by providing two power storage means having different chargeable capacities, a mouse circuit that can use the mouse as soon as possible and can store as much power as possible is constructed.

A circuit configuration of the mouse 3 used in the non-contact power feeding system according to the present invention will be described with reference to the drawings.
FIG. 25 is a diagram illustrating a schematic configuration of a circuit of the mouse 3.
As shown in FIG. 25, the mouse 3 includes a mouse circuit 40 and a power supply unit 41b.

  The power supply unit 41b includes a constant voltage circuit 42, a diode 45, an overvoltage prevention circuit 46, a rectifier circuit 47, a resonance capacitor 48, a mouse unit power receiving coil Lm, a full charge detection circuit 44a, an infrared light emitting diode 50, and a voltage detection between terminals. A circuit 51, a first EDLC 52, a second EDLC 53, a switch 54, and diodes 56 and 57 are provided.

  When the first EDLC 52 reaches a predetermined voltage, the inter-terminal voltage detection circuit 51 switches the switch 54 to the b terminal side in order to set the storage destination to the second EDLC 53. In addition, when the first EDLC 52 is discharged to a predetermined voltage or lower as a result of the discharge, the switch 54 is switched again to the terminal a side, and the first EDLC 52 is charged.

The full charge detection circuit 44a prevents the second EDLC 53 from being overcharged, and outputs a full charge detection signal indicating that to the infrared light emitting diode 50 when the second EDLC 53 reaches a predetermined voltage.
The first EDLC 52 is an electric double layer capacitor having a smaller capacity for storing electricity than the second EDLC 53.
The second EDLC 53 is an electric double layer capacitor having a larger capacity for storing electricity than the first EDLC 52.

The switch 54 is switched and connected to the a terminal or the b terminal in accordance with an instruction from the inter-terminal voltage detection circuit 51.
The mouse circuit 40, the constant voltage circuit 42, the diodes 45, 56 and 57, the overvoltage prevention circuit 46, the rectifier circuit 47, the resonance capacitor 48, the infrared light emitting diode 50, and the mouse portion power receiving coil Lm are the same as those in the above embodiment. The explanation is omitted here because it is the same.

Next, the mechanism of the operation of the mouse according to this embodiment will be described.
When the inter-terminal voltage of the first EDLC 52 is equal to or lower than a predetermined voltage, the switch 54 is connected to the terminal a side. Therefore, when the first EDLC 52 is in a completely discharged state, when feeding is started from the feeding coil, the induced power is first stored in the first EDLC 52 having a small capacitance.

When charges are accumulated in the first EDLC 52 and the voltage between the terminals of the first EDLC 52 reaches a voltage that can drive the constant voltage circuit 42, the mouse 3 is ready for use. Therefore, the smaller the capacitance of the first EDLC 52, the shorter the time until the mouse becomes movable.
Thereafter, while the mouse 3 continues to operate with the power stored in the first EDLC 52, the charging to the first EDLC 52 is continued.
When the first EDLC 52 eventually reaches a predetermined voltage, the inter-terminal voltage detection circuit 51 switches the switch 54 to the b terminal side and switches the storage destination to the second EDLC 53.

  When the electric power accumulated in the first EDLC 52 is consumed by the constant voltage circuit 42 and the mouse circuit 40 and the voltage between the terminals of the first EDLC 52 becomes equal to or lower than a predetermined voltage, the voltage detection circuit 51 between the terminals again switches the switch 54 a to Switching to the terminal side, the power supplied from the mouse pad 2 is stored in the first EDLC 52.

On the other hand, when the second EDLC 53 reaches a predetermined voltage, the full charge detection circuit 44a outputs a full charge detection signal, whereby the infrared light emitting diode 50 is driven.
Infrared communication is performed with the infrared receiving module 50a provided in the control unit 21 of the mouse pad 2, and the fact that charging of the first EDLC 52 and the second EDLC 53 is completed is transmitted to the control unit 21 of the mouse pad 2.

In response to this, the control unit 21 stops the mouse position detection operation and the power supply operation to the mouse 3.
Further, when the mouse 3 is used in a region outside the power supply region and the discharge of the first EDLC 52 progresses and becomes a predetermined voltage or less, the inter-terminal voltage detection circuit 51 switches the switch 54 to the a terminal side, and the mouse pad The power required for driving the mouse 3 is supplied from the second EDLC 53 via the diode 56.

The power supply to the constant voltage circuit 42 and the mouse circuit 40 is performed from the first EDLC 52 and the second EDLC 53 having the higher terminal voltage.
By repeating the above operation, the first EDLC 52 and the second EDLC 53 are charged and discharged.
The non-contact power feeding system according to the present invention has the following effects.

  In general, a mouse is ready to be used as soon as possible after power is supplied, and is kept available for as long as possible even if the mouse is out of the power supply area of the mouse pad. Is good. In other words, it is more convenient for the mouse to be ready for use as soon as possible and to accumulate as much power as possible.

  However, to make the mouse usable as soon as possible, the capacitance of the electric double layer capacitor must be reduced, while to store as much power as possible, the capacitance of the electric double layer capacitor Must be increased. Accordingly, it is difficult to make both the mouse usable as soon as possible and to accumulate as much power as possible.

Therefore, in this embodiment, as shown in FIG. 25, two electric double layer capacitors 52 and 53 having different capacitances are provided on the mouse 3, and when the power supply is started, the electric double layer capacitor 52 having a smaller capacity is first selected. By accumulating electric power, the time required for starting the mouse can be shortened.
Further, when the electric double layer capacitor 52 reaches a predetermined voltage, by switching the power supply destination to the electric double layer capacitor 53 having a large capacity, a large amount of electric power is accumulated, and the mouse can be used for a long time. .

As a result, it is possible to construct a power supply unit capable of storing power that can move the mouse as quickly as possible and maintain the movable state even when the mouse 3 is away from the pad pad unit 22 for a long time. In other words, the combination of the mouse pad and the mouse used in this embodiment can provide a system that can make the mouse operable as quickly and efficiently as possible.
In this embodiment, transistors are used as the position detecting element and the power feeding element. However, these elements may be any switching elements and are not limited to the transistors.

It is the figure which showed the structure of the non-contact electric power feeding system which concerns on embodiment of this invention. It is the figure which showed the cross section of the mouse pad and the mouse. It is the figure which showed the block diagram of a mouse | mouth. It is the figure which showed the example of the method of arrangement | positioning of a feeding coil. 1 is a diagram illustrating a circuit configuration of a mouse according to Embodiment 1. FIG. 3 is a diagram illustrating a circuit configuration of a mouse pad according to Embodiment 1. FIG. It is the figure which showed the pulse and voltage which are output from a pulse oscillator. 3 is a flowchart illustrating an operation of a control unit according to the first embodiment. It is the figure which showed the output state of the pulse oscillator, and the state of each transistor. It is the figure which showed the output state of the pulse oscillator, and the state of each transistor. 3 is a diagram illustrating a specific example of a mouse pad according to Embodiment 1. FIG. It is the figure which showed the relationship between the voltage when not using the mouse | mouth, and time. It is the figure which showed the relationship between the voltage at the time of using a mouse | mouth, and time. 6 is a diagram showing a circuit configuration of a mouse pad used in Example 2. FIG. 6 is a flowchart illustrating an operation of a control unit according to the second embodiment. It is the figure which showed the output state of the pulse oscillator, and the state of each transistor. It is the figure which showed the output state of the pulse oscillator, and the state of each transistor. 6 is a diagram illustrating a circuit configuration of a wireless mouse used in Example 3. FIG. 6 is a cross-sectional view of a mouse and a mouse pad used in Example 3. FIG. It is the figure which showed the timing of electric power feeding and electric power feeding stop. 10 is a flowchart illustrating an operation of a control unit according to the third embodiment. It is the figure which showed the relationship between the voltage when not using a mouse | mouth, and time. It is the figure which showed the relationship between the voltage at the time of using a mouse | mouth, and time. FIG. 10 is a diagram showing a circuit configuration of a mouse pad used in Example 4. FIG. 10 is a diagram showing a circuit configuration of a mouse used in Example 5. It is a figure which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Non-contact electric power feeding system 2 ... Mouse pad 3 ... Mouse 21 ... Control part 22 ... Pad part Lp1-Lpn ... Feeding coil 25 ... Base 26 ... Surface protection Material Lm ・ ・ ・ Mouse coil

Claims (9)

The electric power supplied from the power supply unit provided in the mouse pad by the electromagnetic induction between the power supply coil provided on the operation surface of the mouse pad and the power receiving coil provided in the wireless mouse is used for operating the wireless mouse. In a wireless mouse non-contact power supply system configured to supply non-contact power as
The mouse pad is
Position detecting means for detecting the position of the wireless mouse on the mouse pad;
A plurality of feeding coils arranged on the operation surface of the mouse pad;
Power supply selection means for selecting at least one power supply coil corresponding to the position of the wireless mouse detected by the position detection means from among the plurality of power supply coils;
Power supply means for supplying power for supply to the power supply coil selected by the power supply selection means;
With
The wireless mouse
A wireless mouse non-contact power feeding system comprising first power storage means for storing induced power obtained by electromagnetic induction between the selected power feeding coil and power receiving coil. The position detection means
Comprising means for position detection for selecting one by one from a plurality of feeding coils in order;
It is configured to supply position detection power to the power supply coil selected by the position detection selection means, and to detect the position of the wireless mouse based on a change in the terminal voltage of the power supply coil. The wireless mouse non-contact power feeding system according to claim 1.   The wireless mouse non-contact power feeding system according to claim 1, wherein the first power storage means uses an electric double layer capacitor.   The wireless mouse non-contact power feeding system according to any one of claims 1 to 3, wherein the shape of the power feeding coil is a polygon.   The wireless mouse non-contact power feeding system according to any one of claims 1 to 3, wherein a shape of the power feeding coil is circular.   6. A drive circuit is provided in which power supply coils are arranged at each intersection of matrix wirings, and a first selection means and a second selection means are connected for each row and column wiring. A wireless mouse non-contact power feeding system according to any one of the above. The wireless mouse further includes power amount determination means for determining whether or not a predetermined amount of power is supplied to the first power storage means.
When it is determined by the power amount determination means that a predetermined amount of power has been supplied to the first power storage means, a transmission means for transmitting a signal to that effect to the mouse pad;
With
The mouse pad further includes a receiving means for receiving a signal indicating that a predetermined amount of power has been supplied to the first power storage means,
When receiving a signal that a predetermined amount of power has been supplied to the first power storage means, a first control means for interrupting power supply to the wireless mouse;
A wireless mouse non-contact power feeding system according to any one of claims 1 to 6. Wireless mouse
A second power storage means having a larger amount of power that can be stored than the first power storage means;
Determining means for determining whether or not a predetermined amount of power is supplied to the first power storage means and the second power storage means;
When it is determined that the first power storage means has reached a predetermined amount of power, the power storage switching means for switching the power storage destination from the first power storage means to the second power storage means,
When it is determined that the second power storage means has reached a predetermined amount of power, a transmission means for transmitting a power stop notification to the mouse pad;
With
The mouse pad has a receiving means for receiving a power stop notification from the transmitting means,
A second control means for interrupting the power supply to the wireless mouse when the power supply stop message is received;
A wireless non-contact power feeding system for a wireless mouse according to any one of claims 1 to 7.   9. The position detection power supplied to the power supply coil by the position detection means is smaller than the power supply for supply supplied to the power supply coil by the power supply means. Wireless mouse contactless power supply system.

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