Wireless power feeding system and power receiver having circular, spherical or polyhedral shape

Abstract

[Problem] To use existing electronic devices for wireless charging. [Solution] A wireless power feeding system is provided, including a power feeder and a power receiver, the power receiver including a power receiving coil, a power receiving circuit unit for recovering energy generated in the power receiving coil, and an internal secondary battery for storing energy, wherein electric energy is supplied from the power feeder to the power receiver by electromagnetic induction using a resonance phenomenon. The power receiver has an outer shape that is the same as that of a conventional battery, and has a power receiver housing that accommodates the power receiving coil, the power receiving circuit unit, and the internal secondary battery. In addition, the power receiver has two electrodes that are arranged at the same positions as those of conventional batteries. In addition, the power feeder includes a power feeding base on which the power receiver can be mounted. The power receiving coil of the power receiver is capable of receiving power from any direction, and the power receiver is attached to a battery holder of another electronic device. By placing an electronic device having a power receiver attached thereto on the power feeding base, the internal secondary battery can be charged by means of wireless power feeding from the power feeder to the power receiver, while the power feeder discharges and supplies power to the electronic device.

Description

Technical Field

[0001] The present disclosure relates to a wireless power feeding system, and more particularly, to a system using magnetic coupling of an LC resonant circuit. Background Art

[0002] Among batteries, there are some secondary batteries that are charged by installing them in a dedicated charger. In addition, in wireless power feeding technology, a large number of devices are proposed based on many methods and approaches. Among them, the method using electromagnetic induction is well known.

[0003] Patent document 1 discloses a wireless power supply method and a power supply system, which can supply power for a relatively long distance through electromagnetic field resonance coupling and can more widely expand the frequency utilization range. According to an electromagnetic field resonance wireless power supply method, in the case of wireless power supply (wherein a power transmission circuit of a power transmission device and a power receiving circuit of a power receiving device are coupled through electromagnetic field resonance), by using two different frequency components f1 and f2 for a power source 2, the resonant frequency of the power transmission circuit is set to f1 and / or f2 and the state of the power transmission circuit is periodically changed to make the power transmission device enter an electrical transient state, in which the current and / or voltage are unstable. In the power receiving device, the resonant frequency of the power receiving circuit is set to (f2-f1) or (f1+f2) due to the Hamming phenomenon, and power is supplied to the load at a frequency of (f2-f1) or (f1+f2).

[0004] Patent document 2 discloses a simple wireless power supply device using a toroidal coil as a power transmission device. The power transmission toroidal coil provided on the power transmission device extracts electric energy from a DC power supply to generate periodically changing electromagnetic field resonance energy in space. The power receiving toroidal coil provided on the power receiving device extracts periodically changing electromagnetic field resonance energy from space as electric energy to supply power to a load. The power transmission toroidal coil and the power receiving toroidal coil perform electromagnetic field resonance coupling to supply power from the power transmission device to the power receiving device.

[0005] Patent document 3 discloses a wireless power supply system having a plurality of relay devices, thereby suppressing the degradation of power transmission efficiency caused by the relay devices. The wireless power supply system includes: a power transmission device that transmits power to be supplied; a plurality of relay devices that relay the power transmitted from the power transmission device; a power receiving device that receives the power relayed by the relay device; and a control device that controls the relay device to transmit power through a transmission path that produces the maximum power transmission efficiency among a plurality of transmission paths, and the plurality of transmission paths transmit power from the power transmission device to the power receiving device through the relay device.

[0006] Patent document 4 discloses improving the power transmission efficiency of a magnetic resonance type wireless power feeding system. The magnetic resonance type wireless power feeding system includes: an AC power source; a voltage conversion coil connected to the AC power source; a power transmission side LC circuit; a power receiving side LC circuit; an impedance conversion coil; a load connected to the impedance conversion coil; and a transmission efficiency adjustment capacitor connected in parallel with the load. The power transmission side LC circuit has a power transmission side coil and a power transmission side capacitor, which are arranged near the voltage conversion coil and are excited by electromagnetic induction between the voltage conversion coil and the power transmission side coil. The power receiving side LC circuit has a power receiving side coil and a power receiving side capacitor that resonate with the power transmission side coil. The impedance conversion coil is arranged near the power receiving side LC circuit and is excited by electromagnetic induction between the power receiving side coil and the impedance conversion coil. The transmission efficiency adjustment capacitor has a capacitance to improve the power transmission efficiency from the AC power source to the load.

[0007] Patent document 5 discloses a wireless power supply system that has high versatility and high applicability for all power receiving devices. A wireless power supply system for supplying power to a power receiving device equipped with a power receiving unit from a power supply stand having a power supply unit in a contactless manner includes an intermediate member between the power supply stand and the power receiving device. A single power supply device can supply power to different power receiving devices. In addition, the arrangement of the power receiving device can be changed during power supply. Therefore, a wireless power supply system with high versatility and high applicability can be provided.

[0008] Patent document 6 discloses that even if there is a mismatch in method, size and shape between the power feeding unit and the power receiving unit, power feeding is allowed from the power feeding unit to the power receiving unit in a wireless power feeding device, thereby widening the range of power receiving units to which the power feeding unit can feed power. A detachable converter is provided between the power feeding unit and the power receiving unit. The role of the converter is to establish consistency in the apparent method, size and shape of the power receiving unit with the power feeding unit by using a magnetic circuit, an electric passive element, power re-feeding, etc.

[0009] Patent document 7 discloses a wireless power feeding device that allows efficient power transmission even if the coupling degree of the transmission coil and the receiving coil is changed. The wireless power feeding device includes a resonant circuit and a multi-tone power supply, and transmits a power signal including any one of an electric field, a magnetic field, and an electromagnetic field. The resonant circuit includes a transmission coil and a resonant capacitor connected in series to each other. The multi-tone power supply outputs a multi-tone signal to the resonant circuit, in which a sinusoidal signal having multiple frequencies is superimposed.

[0010] Patent document 8 discloses enhancing the power transmission efficiency in a magnetic resonance type wireless power supply. The wireless power supply system causes the power supply coil and the receiving coil to magnetically resonate by causing the capacitor and the power supply coil to resonate. The resonant frequency at this time is f. The wireless power supply system supplies alternating current with a resonant frequency of f to the power supply coil by alternately turning on or off a switching transistor and a switching transistor.

[0011] Patent document 9 discloses effectively controlling the feeding power in the wireless power feeding of the magnetic field resonance type. The wireless power feeding device wirelessly feeds power from the power feeding coil to the power receiving coil based on the magnetic field resonance phenomenon between the power feeding coil and the power receiving coil. The power transmission control circuit supplies AC power to the power feeding coil at a driving frequency, thereby feeding the AC power from the power feeding coil to the power receiving coil. The phase detection circuit detects the phase difference between the voltage phase and the current phase of the AC power. Specifically, the phase detection circuit compares the first detection period in which the signal T2 is high and the second detection period in which the signal S2 is high, and then detects the phase difference by detecting the length of the period in which the first detection period overlaps with the second detection period.

[0012] Patent document 10 discloses a power supply device, a power receiving device, and a wireless power supply system that can suppress the increase in circuit scale, cost, and power loss and realize impedance adjustment on the power supply side and the power receiving side. The power supply device includes: a power generation unit for generating power to be supplied; a feeding element, which is composed of a coil to which the power generated by the power generation unit is supplied; a resonant element, which is coupled by electromagnetic induction; an impedance detection unit for detecting the impedance of the feeding side; a variable matching unit, including an impedance matching function according to a control signal at a feeding point of the power feeding element; a storage unit for storing impedance characteristic estimation information as a reference table; and a control unit, which obtains the state of the variable matching unit to be adjusted from at least the detected impedance information and the reference table information of the storage unit, and outputs a control signal to the variable matching unit to achieve the obtained state.

[0013] Patent document 11 discloses stabilizing the load voltage in magnetic field resonance type wireless power feeding. Power is fed from the power feeding coil to the power receiving coil by magnetic resonance. The VCO alternately turns on / off the switching transistors Q1 and Q2 at the driving frequency fo, whereby AC power is supplied to the power feeding coil, and then AC power is supplied from the power feeding coil to the power receiving coil. The phase detection circuit detects the phase difference between the current phase and the voltage phase, and the VCO adjusts the driving frequency fo so that the phase difference becomes zero. When the load voltage changes, the detected voltage phase value is adjusted, so that the driving frequency fo is also adjusted.

[0014] Patent document 12 discloses a power receiving circuit capable of achieving a high Q value. The wireless power receiving device receives a power signal S1 including one of an electric field, a magnetic field and an electromagnetic field transmitted from a wireless power supply device. The receiving coil L2 is configured to receive the power signal S1. The power storage capacitor C3 has a first terminal with a fixed potential. The first switch SW1 and the second switch SW2 are connected in series to form a closed loop with the receiving coil L2, and their connection node N1 is connected to the second terminal of the power storage capacitor C3. The third switch SW3 and the fourth switch SW4 are sequentially installed in series on a path parallel to the first switch SW1 and the second switch SW2, and the potential of their connection node N2 is fixed.

[0015] Patent document 13 discloses a power supply device, a power receiving device, and a wireless power supply system capable of obtaining a frequency characteristic with a wider bandwidth in a magnetic field resonance type. The power supply device includes a power generator for generating power to be supplied, a power supply element for receiving the power generated by the power generator, and a plurality of resonance elements arranged at multiple stages and coupled to each other through a magnetic field resonance relationship, one of the plurality of resonance elements being coupled to the power supply element through electromagnetic induction.

[0016] Fig.11 A basic circuit diagram of an existing wireless power feeding system is shown. The phase detection circuit detects the difference in resonant frequency as the phase of the frequency by periodically controlling the on / off of SW1, SW2, SW3, and SW4, wherein a series resonant circuit including a power feeding coil and a resonant capacitor is installed on one side of the power feeder. Therefore, the electromagnetic induction from the power feeding coil is periodically stopped, and at a predetermined time just after the stop, (by turning on SW1 and SW4 and turning off SW2 and SW3), the radiation of electric energy stored in the capacitor of the power receiver and the power receiving coil in the form of electromagnetic waves of the same resonant frequency can be detected and determined as a phase difference. In this case, in addition to the power feeding coil, a receiving coil dedicated to detecting the resonant frequency can also be installed in the power feeder. In the case of Fig.11 In the series resonant circuit shown in , when power supply is stopped, supply of electric energy from the power feeding coil is stopped, and during this period, conversely, the power feeding coil functions as a power receiving coil.

[0017] [Related Literature]

[0018] [Patent Document]

[0019] (Patent Document 1) Patent Document 1: Japanese Patent Publication No. 2017-163647

[0020] (Patent Document 2) Patent Document 2: Japanese Patent Publication No. 2017-028998

[0021] (Patent Document 3) Patent Document 3: Japanese Patent Publication No. 2017-028770

[0022] (Patent Document 4) Patent Document 4: Japanese Patent Publication No. 2014-176122

[0023] (Patent Document 5) Patent Document 5: Japanese Patent Publication No. 2014-068507

[0024] (Patent Document 6) Patent Document 6: Japanese Patent Publication No. 2013-162611

[0025] (Patent Document 7) Patent Document 7: Japanese Patent Publication No. 2012-253944

[0026] (Patent Document 8) Patent Document 8: Japanese Patent Publication No. 2012-231674

[0027] (Patent Document 9) Patent Document 9: Japanese Patent Publication No. 2012-182975

[0028] (Patent Document 10) Patent Document 10: Japanese Patent Publication No. 2011-223739

[0029] (Patent Document 11) Patent Document 11: Japanese Patent Publication No. 2011-217596

[0030] (Patent Document 12) Patent Document 12: Japanese Patent Publication No. 2013-524743

[0031] (Patent Document 13) Patent Document 13: Japanese Patent Publication No. 2011-151958 Summary of the invention

[0032]

Technical issues

[0033] There are some electronic devices that use secondary batteries embedded therein. When the secondary battery runs out of energy, in order to charge the discharged secondary battery, the secondary battery is generally removed from the electronic device and installed in a dedicated charger. In addition, in order to apply a product using a battery to wireless power feeding, a dedicated power feeding coil and circuit are necessary, so manufacturers need to develop a new device.

[0034] For wireless power feeding, a resonant circuit is used in some cases. For the resonant circuit on the feeder side, a series resonant circuit or a parallel resonant circuit can be selected. The series resonant circuit is easy to transmit a large capacity of energy, but the loss is large. On the other hand, in contrast to the series resonant circuit, the parallel resonant circuit is used to transmit a relatively small capacity of energy and is easy to stabilize the resonant state. The existing general wireless power feeding uses a series resonant circuit on the power feeder side (see Fig.11 ). In addition, frequency tuning is usually performed by detecting the resonant state, but the power feeder performs resonant state detection and frequency tuning by using the receiving coil for detection or switching power feeding and power reception. In addition, the power receiver detects the resonant state and transmits the information to the power feeder by any communication method (Qi standard, etc.). This structure leads to an increase in cost.

[0035] The present disclosure aims to provide a power feeder that performs appropriate control in combination with a very simple power receiver, and a wireless power feeding system including the combination. In other words, the present disclosure aims to provide a system that realizes wireless charging using existing electronic devices.

[0036]

Technical solution

[0037] The inventors adopted a parallel resonant circuit on the power feeder side. The power receiver has a very simple configuration. After repeated trials in an attempt to provide an easy-to-use wireless power feeding system according to this method, they finally obtained a suitable system. In addition, in the case of wireless power feeding from a power receiver to a cylinder such as a battery, due to the shape of the ferrite coil and the high orientation relative to the magnetic flux from the power feeder, it is necessary to place the power receiver in the direction toward the power feeder, but a method is proposed in which a power receiving coil capable of receiving power in any direction by operating the ferrite coil. In this case, the risk of deterioration of the installed operating unit is resolved. That is, in addition to adopting a parallel resonant circuit on the power feeder side, the power receiver also uses a ferrite coil capable of receiving power in any direction. The ferrite coil is a coil wound on one ferrite in two or three directions.

[0038] A wireless power feeding system according to the present disclosure includes: a power feeder including a power feeding coil for generating electromagnetic waves and a power feeding circuit unit for supplying power to generate electromagnetic waves in the power feeding coil; and a power receiver including a power receiving coil for receiving electromagnetic waves emitted from the power feeding coil by electromagnetic induction, a power receiving circuit unit for recovering energy generated in the power receiving coil, and an internal secondary battery for storing energy recovered by the power receiving circuit unit, wherein electric energy is supplied from the power feeder to the power receiver by electromagnetic induction using a resonance phenomenon of a predetermined resonance frequency, and the power receiver further includes: A power receiver housing having the same outer shape as that of an existing battery and configured to accommodate a power receiving coil, a power receiving circuit unit, and an internal secondary battery; and two electrodes, which are arranged at the same positions as those of the existing battery, the power feeder also includes a power feeding base in which the power receiver is placed, and the power receiver is installed in a battery holder embedded in another electronic device, and in the installed state, when placed in the power feeding base together with the electronic device, power is supplied by charging the internal secondary battery through wireless power feeding from the power feeder to the power receiver and discharging to the other electronic device at the same time.

[0039] Therefore, the power receiver is handled in the same manner as a battery, the power receiver is embedded in an electronic device and can be charged when embedded in the electronic device, and while being charged, the power receiver can discharge (supply power) to the electronic device.

[0040] In addition, in the wireless power feeding system according to the present disclosure, the power feeding circuit unit of the power feeder further includes: a resonant capacitor tuned to a resonant frequency to form a parallel resonant circuit in combination with a power feeding coil; a switch circuit that periodically repeats turning on (operating state) and off (resonant state) the power supply to the power feeding coil; a frequency tuning circuit for changing the frequency of the power supplied to the power feeding coil; a control circuit for controlling both the switch circuit and the frequency tuning circuit; and a resonant state sensor for detecting the resonant state of the power feeding coil and outputting a detection signal to the frequency tuning circuit and the control circuit, and the control circuit is configured to set the power feeding frequency and the operation duration according to information from the resonant state sensor to obtain an optimal resonant frequency and a stable resonant state, control the switch circuit and the frequency tuning circuit based on the setting, and stop power feeding when an abnormal resonant state is determined. Therefore, power feeding by the power receiver can be achieved.

[0041] In addition, the power receiver also includes an external secondary battery connection terminal for connection of an external secondary battery, and the external secondary battery is connected to the connection terminal to form a large-capacity power receiver. Therefore, a secondary battery that is not placed in the power feeding base can be charged.

[0042] In addition, the power receiving coil embedded in the power receiver is a cylindrical or polygonal coil, and is an air-core coil or a ferrite coil in which a coil is wound around a cylindrical or polygonal ferrite.

[0043] Therefore, it is possible to provide a power receiving coil having a shape for embedding in a power receiver case having the same shape as a battery, thereby increasing diversity.

[0044] Furthermore, the power receiver case has the same shape as an existing battery, and the wireless power feeding system further includes a power receiving coil supporting device which is rotatable to guide the power receiver toward a predetermined direction when the power receiver is placed in the power feeding base.

[0045] Therefore, the power receiving coil can be guided toward the power feeder, thereby increasing the orientation of the power receiving coil.

[0046] In addition, the power feeding base has a shape, form or color indicating a possible power feeding range, and has at least one groove, and the groove allows the power receiver housing to be placed without rolling when the power receiver housing is cylindrical, and is configured to place an electronic device in which the power receiver is embedded.

[0047] Therefore, the power receiver can be easily placed on the power feeding base.

[0048] A wireless power feeding system according to the present disclosure includes: a power feeder including a power feeding coil for generating electromagnetic waves and a power feeding circuit unit for supplying power to generate electromagnetic waves in the power feeding coil; and a power receiver including a power receiving coil for receiving electromagnetic waves emitted from the power feeding coil by electromagnetic induction, a power receiving circuit unit for recovering energy generated from the power receiving coil, and an internal secondary battery for storing energy recovered by the power receiving circuit unit, wherein electric energy is supplied from the power feeder to the power receiver by electromagnetic induction using a resonance phenomenon of a predetermined resonance frequency, the power receiver also includes: a power receiver case having the same outer shape as that of an existing battery and configured to accommodate the power receiving coil, the power receiving circuit unit, and the internal secondary battery; and two electrodes provided at the same positions as those of the existing battery, the power feeder also includes a power feeding base in which the power receiver is placed, and the power receiving coil of the power receiver is a ferrite coil having windings on one ferrite in a plurality of winding directions, each winding being connected in series, and magnetic flux passes through the power receiving coil in any rotation direction to generate an electromotive force by electromagnetic induction.

[0049] Accordingly, the power receiver can be cylindrical and face any direction, under which premise, the power receiver is treated in the same way as a battery, embedded in an electronic device, and can be charged when embedded in the electronic device. In addition, while being charged, the power receiver can discharge (supply power) to the electronic device.

[0050] In addition, in the wireless power feeding system according to the present disclosure, the power feeding circuit unit of the power feeder also includes: a resonant capacitor which is tuned to a resonant frequency to form a parallel resonant circuit in combination with the power feeding coil; a switching circuit which periodically repeats turning on (operating state) and off (resonant state) of power supply to the power feeding coil; a frequency tuning circuit for changing the frequency of power supplied to the power feeding coil; a control circuit for controlling both the switching circuit and the frequency tuning circuit; and a resonant state sensor for detecting the resonant state of the power feeding coil and outputting a detection signal to the frequency tuning circuit and the control circuit, and the control circuit is configured to set the power feeding frequency and the operation duration according to information from the resonant state sensor to obtain an optimal resonant frequency and a stable resonant state, control the switching circuit and the frequency tuning circuit based on the setting, and stop power feeding when an abnormal resonant state is determined.

[0051] Therefore, power feeding by the power receiver can be achieved.

[0052] In addition, the power receiver housing has the same shape as an existing battery and is mounted on a battery holder embedded in another electronic device, and in the mounted state, when placed in a power feeding base together with the electronic device, power is supplied by charging the internal secondary battery via wireless power feeding from the power feeder to the power receiver and simultaneously discharging to the other electronic device.

[0053] Furthermore, in the power receiver, an internal secondary battery is embedded in a spherical or polygonal casing, a winding of a ferrite coil as a power receiving coil of the power receiver is a ferrite coil having windings in at least 3 directions on at least one ferrite, each winding being connected in series, and even in a case where the power receiver faces any direction relative to the power feeder and even rolls, power is supplied by charging the internal secondary battery via wireless power feeding and simultaneously discharging it to the other electronic device.

[0054]

Beneficial Effects

[0055] The wireless power feeding system of the present disclosure includes a power receiver of a simple configuration, and is capable of charging an internal secondary battery in the power receiver while discharging (as battery output) to an electronic device.

[0056] Therefore, the power receiver of the present invention (in which a power receiving coil, a circuit unit and a battery are embedded) which conforms to the shape of a commercially available battery is installed in a device using a battery to replace the battery, and performs a wireless charging operation when installed in the device, thereby eliminating the need to remove the battery to charge the battery, thereby realizing a device capable of wireless power feeding without modifying the device.

[0057] By solving the problem of battery waste that causes environmental problems, more convenient secondary batteries can be suggested.

[0058] In addition, the second wireless power feeding system of the present disclosure uses a ferrite coil in a power receiver to receive power in any direction, thereby charging the internal secondary battery in the power receiver and discharging (as battery output) to an electronic device regardless of the direction the power receiver faces.

[0059] Therefore, the power receiver of the present invention conforms to a cylindrical shape (for example, a commercially available battery), in which a power receiving coil, a circuit unit and a battery are embedded, the power receiving coil is a ferrite coil capable of receiving power in any direction, the power receiver is installed in a device using a battery to replace the battery, and performs a wireless charging operation when installed in the device, thereby eliminating the need to remove the battery to charge the battery, thereby realizing a device capable of wireless power feeding without modifying the device.

[0060] By solving the problem of battery waste that causes environmental problems, more convenient secondary batteries can be suggested. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 This is a basic circuit configuration diagram.

[0062] Figure 2 This is the timing diagram of the basic circuit.

[0063] Figure 3 is a diagram showing a product picture of a power receiver.

[0064] Figure 4 This is a configuration diagram of a battery type power receiver.

[0065] Figure 5 This is a diagram of the configuration of a button cell type power receiver.

[0066] Figure 6 Is the configuration of a battery type power receiver Figure 2 .

[0067] Figure 7 is a diagram illustrating a method for operating a power receiver unit.

[0068] Figure 8is a diagram showing external secondary battery connection.

[0069] Fig. 9 An embodiment of a power feeder for a battery type power receiver is shown.

[0070] Fig.10 An embodiment of a power feeder for a button cell type power receiver is shown.

[0071] Fig.11 This is a diagram of the existing circuit configuration.

[0072] Fig.12 This is a basic circuit configuration diagram of the second invention.

[0073] Fig.13 It is a timing diagram of the basic circuit of the second invention.

[0074] Fig.14 It is a diagram showing a picture of a device in which the power receiving device of the second invention is embedded.

[0075] Fig.15 It is a configuration diagram of a battery type power receiver of the second invention.

[0076] Fig.16 is a diagram showing a ferrite coil of a power receiver unit of the second invention.

[0077] Fig.17 An embodiment of a power feeder used for a battery type power receiver of the second invention is shown. DETAILED DESCRIPTION

[0078] Preferred embodiments of the system for implementing the present disclosure are described below with reference to the accompanying drawings.

[0079] Figure 1 1 is a basic circuit configuration diagram of a wireless power feeding system according to the present disclosure. The wireless power feeding system according to the present disclosure includes a combination of a power feeder 10 and a power receiver 30. Electric energy is supplied from the power feeder 10 to the power receiver 30.

[0080] like Figure 1 As shown, the power receiver 30 includes a power receiving coil 31 , a capacitor 33 , a rectifying circuit 34 , and an internal secondary battery 37 .

[0081] In addition, the capacitor 33 may be connected in series or in parallel to the power receiving coil 31. In the present disclosure, parallel connection is preferred.

[0082] There are several features on the power receiver 30 side.

[0083] First, the internal secondary battery 37 is installed in the power receiver 30 .

[0084] Second, the power receiving coil 31 installed in the power receiver 30 may be significantly different in size, material, or electrical specifications from the power feeding coil 11 of the power feeder 10 .

[0085] Third, the power receiver 30 is housed in an existing battery or button cell type housing and produces an electrical output equivalent to that of a battery, thereby serving as a replacement for a battery.

[0086] The power feeder 10 includes a power feeding coil 11, a resonant capacitor 13 that forms a resonant circuit with the power feeding coil 11, a switch circuit 14 for turning on / off power to the power feeding coil 11, a frequency tuning circuit 15 (for example, a circuit including a phase-locked loop (PLL) circuit) for tuning a frequency supplied to the power feeding coil 11, a resonant state sensor 16 for detecting a resonant state, and a power supply 18.

[0087] Features on the power feeder 10 side are as follows.

[0088] First, the power feeding coil 11 and the resonance capacitor 13 form a parallel resonance circuit. Second, there is a switch ( Fig.11 ). Third, the frequency and the power supply time are controlled by controlling the frequency tuning circuit 15 and the switch circuit 14 by the control circuit 17. Fourth, the resonance state sensor 16 detects the resonance state (mainly frequency mismatch), and in addition to the control, the control circuit 17 also controls to stop the power feeding based on the detection result of the resonance state sensor 16.

[0089] Figure 1 It is a basic circuit diagram (close to a block diagram). In the basic circuit, the power feeding coil 11 generates electromagnetic waves to cause electromagnetic induction. The circuit of the power feeder 10 includes at least a resonant capacitor 13 and a power source 18, and forms a resonant relationship with the power receiving coil 31 of the power receiver 30 at a predetermined frequency. The frequency at this time is called a resonant frequency, and a frequency of 100kHz to 500kHz is generally used. The resonant frequency used in the present disclosure is not particularly limited.

[0090] There is a slight mismatch in the resonant frequency in the positional relationship or state of the power receiver 30. For example, the situation gradually changes with the appropriate position or tilt of the power receiving coil 131 of the power receiver 130. Therefore, when the power receiving coil 31 enters the range ( Figure 1 When the magnetic flux lines shown in FIG. 1 are not present, energy can be supplied. The power receiving coil 31 entering the magnetic flux lines affects the power feeder in the form of a resonant frequency mismatch. When there is a resonant frequency mismatch, energy supply efficiency decreases.

[0091] The resonance state sensor 16 (for example, a circuit including a phase detection circuit using a current sensor and a voltage sensor) detects frequency or phase mismatch, and the frequency tuning circuit 15 tunes the frequency of the power feeding coil 11 according to the frequency or phase. The frequency tuning circuit 15 may be a circuit that adjusts the capacity of a capacitor, for example.

[0092] It is necessary to add several factors in the frequency (or phase) tuning. Therefore, it is preferable to install a control circuit 17, which is controlled according to a program using a microcontroller (an integrated circuit including a processor, a memory, and a peripheral circuit) or a programmable logic device (an integrated circuit capable of defining and changing an internal logic circuit). The control circuit 17 is connected to a resonance state sensor 16 (phase detection circuit). The resonance state sensor 16 detects a frequency or phase mismatch and sends its signal to the control circuit 17. Therefore, when a predetermined object other than the power receiver 30 approaches, the resonance state sensor 16 detects an abnormal frequency or phase and sends its signal to the control circuit 17, so that the control circuit 17 stops power feeding.

[0093] The above basic circuit diagram is configured with Fig.11 The existing basic circuits shown in have something in common. However, in Fig.11 In the conventional power feeder shown in , a capacitor is connected in series with the power feeding coil, and the reference of the resonant frequency can be adjusted according to the specification of the capacitor. The conventional circuit connection method is generally called a series resonant circuit.

[0094] In contrast, Figure 1 The circuit of the power feeder 10 of the wireless power feeding system of the present disclosure shown in FIG. 1 employs a parallel resonance circuit.

[0095] In addition, Fig.11 In the conventional technology example shown in , the resonance at the power feeding coil is periodically stopped to detect the frequency mismatch. In contrast, Figure 1 The circuit uses a method of detecting the resonance state without stopping the power feeding to the power feeding coil 11.

[0096] The wireless power feeding system of the present disclosure includes Figure 1 The basic circuit shown in Fig.11 In contrast to the conventional technology example shown in , the resonant capacitor 13 of the power feeder 10 is connected in parallel with the power feeding coil 11. A circuit including the resonant capacitor 13 is generally referred to as a parallel resonant circuit.

[0097] In the case of a parallel resonant circuit, when SW1 is turned on, a stable resonant state is generated, and then when SW1 is turned off, the power feeder 10 continues the resonant state with the power receiver 30 during the radiation of the energy stored in the power receiving coil 31 and the capacitor 33. The on / off timing of SW1 is controlled using a PLL circuit. Here, the frequency tuning circuit 15 and the control circuit 17 implement power supply of an appropriate frequency based on the resonant state shift detected by the resonant state sensor 16 connected in parallel to the power feeding coil 11. The resonant state sensor 16 is a sensor that detects the resonant state and detects the shift of the voltage and current and the phase of the resonant frequency.

[0098] exist Figure 1 In the circuit, Fig.11 Compared with the conventional technical example shown in , it is difficult to clearly detect the phase mismatch in the resonant frequency of the power receiver 30. However, a simple determination as to whether to increase or decrease the resonant frequency or maintain the resonant frequency can be processed by simulation of many situations obtained by the resonant state sensor 16 and programming based on the simulation. In addition, by detecting the change of the result after tuning and determining whether it is appropriate, control can be performed by trial and error.

[0099] Figure 2 yes Figure 1 Schematic signal waveform diagram of the basic circuit of the power feeder 10 is shown. Figure 2 (A) shows Figure 1 The waveform when the switch circuit 14 is turned on at a high level is shown in FIG. In short, when turned on, the power supply 18 is supplied, resulting in an operating state, that is, an operating duration. The disconnection and non-operating duration result in a resonant state, that is, a resonance duration.

[0100] like Figure 1 As shown, when the power feeding coil 11 forms a parallel resonance circuit with the resonance capacitor 13, the power feeder 10 continues to supply energy while it is in a resonance state with the power receiver 30 regardless of being in an operating state or a resonance state.

[0101] Figure 2 (B) shows an operation signal. When the switch circuit 14 is turned on, the power supply 18 is turned on. Figure 2 (C) shows Figure 1 The resonant state sensor 16 detects a sampling signal when it is turned on to detect (sample) a plurality of signals for a sampling duration. Figure 2 (D) shows the input to Figure 1The received signal of the resonance state sensor 16. This signal shows the state of the power feeding coil 11 in the resonance state. Although the signal waveforms are schematically shown, they are signals with frequency characteristics and the frequency components can be measured. Generally, the voltage is converted into a digital value by an AD conversion circuit, and the information is sent to Figure 1 The control circuit 17.

[0102] for Figure 2 When the energy in the power feeding coil 11 and the resonance capacitor 13 is supplied to the power receiver 30, the signal strength (voltage) is as follows: Figure 2 By seeing this change, it is possible to simulate whether it resonates well. In addition, the frequency characteristics can be detected as a phase difference. A slight change is found between the resonance and non-resonance of the power feeder 10 and the power receiver 30. Taking all this into consideration, the control circuit 17 cooperates with the frequency tuning circuit 15 to tune the frequency at the power supply. In some cases, the frequency mismatch can be intentionally made to see Figure 2 In addition, in the resonance state with the power receiver 30, the control circuit 17 considers the following Figure 2 (D) shows the voltage reduction method to adjust the operation duration.

[0103] in addition, Figure 2 The detection of the resonant state sensor 16 shown in (C) involves energy loss like the power feeder 10. Therefore, instead of performing detection every time, sampling can be performed intermittently, for example, once per second to suppress energy loss. In addition, the specifications and resonant frequency of the power supply 18 or the power feeding coil 11 are determined according to the size of the energy desired to be transmitted or the width or height of the target to be fed with power. The resonant capacitor 13 is usually set according to the specifications of the resonant frequency used as a reference. In practice, their configuration is formed as an enhanced circuit that has been repeatedly configured with complex simulations. As described above, since the control circuit 18 uses a programmable circuit such as a microcontroller or a programmable logic device, a suitable program can be found after repeated simulation and control according to the program.

[0104] The circuit of the power receiver 30 includes a predetermined power receiving coil 31, and at least a capacitor 33 and a rectifier circuit 34. The power receiver 30 has an internal secondary battery 37 embedded therein. The internal secondary battery 37 is a rechargeable secondary battery. The secondary battery can be replaced with a supercapacitor (double-layer capacitor). The specification or capacity and resonant frequency of the power receiving coil 31 are set according to the amount of energy expected to be received, but the capacity expected to be received by the power receiving coil 30 can be considered first when designing.

[0105] When electromagnetic induction of a predetermined resonance frequency occurs in the power feeding coil 11 of the power feeder, a magnetic flux is generated, for example, Figure 1 . In front of the magnetic flux line, when the power receiving coil 31 of the power receiver 30 enters, electric energy is generated by the electromotive force of electromagnetic induction. The energy is recovered and stored in the internal secondary battery 37. In the case of the existing ordinary wireless power feeding device, in many cases, the power receiver 30 includes a communication device for communicating with the power feeder 10 to indicate the state where the frequency detection circuit and the power receiver 30 are placed. The communication device sends a signal to the power feeder 10, and the power feeder 10 has a structure to tune the appropriate resonant frequency. In this case, the power receiver 10 requires a predetermined IC circuit.

[0106] In contrast, the present disclosure forms the circuit of the power receiver 30 in a very simple structure. Since this simple configuration makes it possible to charge and discharge at the same time, when the charger is installed in the corresponding electronic device, the electronic device can be charged and discharged at the same time to supply power through the wireless power feeding system.

[0107] In particular, the structure is an application of the structure of a stylus pen using electromagnetic induction of Patent No. 5714194. For example, the stylus pen includes a simple power receiving coil and a capacitor. In this simple configuration, pen pressure information or on / off can be detected by a change in the resonant frequency. By applying this principle, it is possible to determine whether it is normal or abnormal by checking the state of the resonant frequency, and whether tuning is required.

[0108] <<Outline of a power receiver in the same shape as a button battery>>

[0109] Figure 3 A product picture of an embodiment of a power receiver of the present disclosure is shown. In the present disclosure, Figure 1 The power receiver may include a housing and electrode terminals, the housing having the same shape as a battery or a button cell. Figure 3 An embodiment of a power receiver having the same shape as a button battery is shown. The power receiver can be installed in a battery holder of an electronic device using a battery. The embedded secondary battery embedded in the power receiver is charged with electric energy received from the power feeder. Therefore, the electronic device can be used while feeding power without replacing or removing the battery.

[0110] <<Internal configuration of a power receiver having the same shape as a battery>>

[0111] Figure 4: is a configuration diagram of a power receiver having the same shape as a battery as another embodiment of the power receiver of the present disclosure. The power receiver having the same shape as a battery is housed in a battery-type housing having electrode terminals of a battery. A power receiving coil 31, an internal secondary battery 37, and a power receiving circuit board (capacitor, rectifier circuit, etc.) are housed in the battery-type housing. A shielding plate 36 serving as an electromagnetic shield is installed in the power receiving coil 31. Figure 4 As shown, the power receiving circuit board 35 is placed in the gap of the power receiving coil 31 to fit into a small accommodation volume. The electrode terminals 39A, 39B are installed in the power receiver case 38 having the same shape as the battery, and the electrode terminals 40A, 40B are installed in the power receiving circuit board 35. In order to connect the electrode terminal 39B and the electrode terminal 40B, the electrodes of the internal secondary battery 37 can be used instead of the wiring connection.

[0112] <<Internal structure of a power receiver having the same shape as a button battery>>

[0113] Figure 5 : is a diagram showing the internal configuration of a power receiver having the same shape as a button cell (button-type battery). The power receiver of this embodiment has the same shape as a button cell and is housed in a power receiver housing 41 having the same shape as a button cell having the same electrode terminals. The power receiver has an internal secondary battery 37, a shielding plate 36, a power receiving coil 31, and a power receiving circuit board 35. The shielding plate 36 serving as an electromagnetic shield is installed between the power receiving coil 31 and the internal secondary battery 37. Figure 5 As shown, the power receiving circuit board 35 and the internal secondary battery 37 are placed in the gap of the power receiving coil to fit into a small accommodation volume. When the electrode terminal 39 of the power receiver case 41 having the same shape as a button battery is involved, the electrode terminal 40 is installed in the power receiving circuit board 35. One of the two electrode terminals can use the electrode of the internal secondary battery 37.

[0114] <<Example of using a power receiving coil having high orientation in a battery type power receiver>>

[0115] Figure 6 An example of using a power receiving coil having high orientation in a battery type power receiver (a power receiver having a power receiver case having the same shape as a battery) is shown. Figure 4 The configuration is different in that the power receiving coil 31 is a coil with high orientation (cylindrical coil, air-core coil, ferrite coil 44, etc.). Figure 6It is omitted in the description, but when using a power receiving coil with a high orientation, it needs to face the power feeder, so a power receiving coil support is installed to guide the coil in the appropriate direction. The coil has a shape such as a cylindrical wound coil, not a torus shape. The coil can be an air-core coil, but a ferrite coil with a cylindrical ferrite makes the characteristics better. Figure 6 The embodiment selects the ferrite coil 44. The power receiver is embedded in a battery-type housing 38 having an electrode terminal of a battery. The power receiver has an internal secondary battery 37, a ferrite coil 44, and a power receiving circuit board 35. When it comes to the electrode terminals 39A, 39B of the power receiver housing having the same shape as the battery, a wiring connection is established on the electrode terminals 40A, 40B on the power receiving circuit board 35 side. For the connection of the electrode terminal 39B and the electrode terminal 40B, a direct connection can be made in the internal secondary battery 37, and the electrodes of the internal secondary battery 37 itself can be exposed to the outside.

[0116] <<Supporting device for supporting a power receiving coil having high orientation>>

[0117] Figure 7 4 is a diagram showing a supporting device for supporting a power receiving coil having a high orientation. The device (power receiving coil supporting device 45) rotates to support the power receiving coil by a rotation axis. Figure 7 The ferrite coil 44 shown in FIG. The ferrite coil 44 is positioned by the rotation axis between the power receiving circuit board 35 and the fixing plate 47. At the position where the ferrite coil 44 is fixed, a weight 46 is installed to guide the ferrite coil toward the power feeder. By the movement of the power receiving coil supporting device 45 and the weight 46, the ferrite coil 44 is always facing downward along the earth's gravity. Therefore, when the power receiver is placed on the power feeding base of the power feeder, it matches the direction in which the ferrite coil 44 is subjected to the magnetic flux of the power feeding coil. In addition, the connection from the ferrite coil 44 to the power receiving circuit board 35 using an electric wire should be considered. Preferably, the rotation axis of the power receiving coil supporting device 45 can be rotated to 360°.

[0118] <<Power receiver connectable to external secondary battery>>

[0119] Figure 8 It is a connection example of the secondary battery 50 as an external secondary battery. Here, although the button battery type power receiver 30 is shown, the battery type power receiver can have the same function. When the internal secondary battery embedded in the power receiver 30 is replaced with a super capacitor (super capacitor), it becomes a short-term transient battery. In addition, fast charging is possible. In addition, installation Figure 8The external secondary battery connection terminals 51A, 51B shown in the figure are used to install the external secondary battery 50. Therefore, for example, even a small capacity type (e.g., a button battery) can be used as a large capacity battery. In this case, the embedded supercapacitor acts as a stabilizer for the power supply. Figure 8 In the case of the configuration shown in , since a button battery holder of a battery receiving device can be used, a high-capacity secondary battery capable of wireless power feeding can be constructed without changing the structure of the device as long as there is space for an external secondary battery. <<Power Feeder of Battery Type Power Receiver>>

[0120] Fig. 9 is an embodiment of a power feeder for a battery type power receiver.

[0121] Fig. 9 The power feeder shown in (1) can wirelessly charge a plurality of battery type power receivers at the same time. Fig. 9 A device with four grooves 22 is shown to wirelessly charge up to four power receivers simultaneously. Since the battery is cylindrical and therefore rotatable, the device can have small grooves 22. Fig. 9 As shown, the groove 22 may be a curved groove having a size larger than the battery, or conversely, may be a groove smaller than the battery. Preferably, when mounted in the power receiver receiving device, the battery type power receiver can feed power wirelessly. Therefore, Fig. 9 The recess of the power feeder shown in is configured to allow the power receiver receiving device to be well positioned. Fig. 9 As shown in (2). The power feeder has at least an indicator indicating that charging is in progress, a power switch, a power line, and an AC power source. The power source may be embedded in the power feeder. In addition, a USB of a computer may be used as a power source device.

[0122] <<Power Feeder of Button Cell Type Power Receiving Device>>

[0123] Fig.10 An embodiment of a power feeder for a button cell type power receiver is shown. The power feeder can wirelessly charge multiple battery type power receivers simultaneously. Fig.10 A device capable of wirelessly charging 2 power receivers (one of which is a power receiver accommodating device) at the same time is shown. Rubber is attached to indicate the possible power feeding range (power feeding available) 21 and prevent slipping. The power feeder has at least an indicator indicating that it is charging, a power switch, a power line, and an AC power source. In some cases, the power source may be embedded, or a USB may be used as a power source device. <<Second invention, namely an invention designed specifically for ferrite coils>>

[0124] Preferred embodiments of the system for implementing the second invention will be described in detail below with reference to the accompanying drawings. Fig.12 1 is a basic circuit configuration diagram of a wireless power feeding system according to the present disclosure. The wireless power feeding system according to the present disclosure includes a combination of a power feeder 110 and a power receiver 130. Electric energy is supplied from the power feeder 110 to the power receiver 130.

[0125] like Fig.12 As shown, the power receiver 130 includes a power receiving coil 131, a capacitor 133, a diode 132, a rectifier circuit 134, and an internal secondary battery 137. There are several features on the power receiver 130 side. First, the internal secondary battery 137 can be installed in the power receiver 130. Second, the power receiving coil 131 installed in the power receiver 130 can be significantly different from the size, material or electrical specifications of the power feeding coil 111 of the power feeder 110. In particular, the shape of the power receiving coil 131 is characteristic and has a coil shape that can receive power in any direction. Third, the power receiver 130 is housed in an existing battery or button battery type housing and produces an electrical output equivalent to a battery, thereby serving as a substitute for a battery.

[0126] The power feeder 110 includes a power feeding coil 111, a resonant capacitor 113 forming a resonant circuit with the power feeding coil 111, a switch circuit 114 for turning on / off the power feeding coil 111, a frequency tuning circuit 15 (for example, a circuit including a PLL circuit) for tuning the frequency supplied to the power feeding coil 111, a resonant state sensor 116 for detecting a resonant state, and a power supply 118. Features of the power feeder 110 are as follows. First, the power feeding coil 111 and the resonant capacitor 113 form a parallel resonant circuit. Second, there is a Fig.17 A switch ( Fig.11 ). Third, the frequency and the power supply time are controlled by controlling the frequency tuning circuit 115 and the switch circuit 114 by the control circuit 17. Fourth, the resonance state sensor 116 detects the resonance state (mainly the frequency difference), and in addition to the control, the control circuit 17 also controls to stop the power feeding based on the detection result of the resonance state sensor 116.

[0127] Fig.12 It is a basic circuit diagram (close to a block diagram). The basic circuit includes a power feeding coil 111, and generates electromagnetic waves to cause electromagnetic induction. The circuit of the power feeder 110 includes at least a resonant capacitor 113 and a power source 118, and forms a resonant relationship with the power receiving coil 131 of the power receiver 130 at a predetermined frequency. The frequency at this time is called a resonant frequency, and a frequency of 100kHz to 500kHz is generally used. The resonant frequency used in the present disclosure is not particularly limited.

[0128] There is a slight difference in the resonant frequency in the positional relationship or state of the power receiver 130. For example, the situation gradually changes with the appropriate position or tilt of the power receiving coil 131 of the power receiver 130. Therefore, when the power receiving coil 131 enters the range ( Fig.12 ), energy can be supplied. The power receiving coil 131 entering the magnetic flux line affects the power feeder in the form of a resonant frequency difference. When there is a resonant frequency mismatch, the energy supply efficiency decreases. The resonant state sensor 116 (for example, a circuit including a phase detection circuit) detects the frequency or phase mismatch, and the frequency tuning circuit 115 tunes the frequency of the power feeding coil 111 according to the frequency or phase. The frequency tuning circuit 115 may be, for example, a circuit in which a PLL circuit is embedded.

[0129] It is necessary to add several factors in the frequency (or phase) tuning. Therefore, it is preferable to install a control circuit 117, which is controlled according to a program using a microcontroller (an integrated circuit including a processor, a memory, and a peripheral circuit) or a programmable logic device (an integrated circuit capable of defining and changing an internal logic circuit). The control circuit 117 is connected to a resonant state sensor 116 (phase detection circuit). The resonant state sensor 116 detects the difference in frequency or phase and sends its signal to the control circuit 117. Therefore, when a predetermined object other than the power receiver 130 approaches, the resonant state sensor 116 detects an abnormal frequency or phase and sends its signal to the control circuit 117 to cause the control circuit 117 to stop power feeding.

[0130] The present disclosure is characterized in that Fig.12 The circuit of the power feeder 110 shown in FIG. 1 adopts a parallel resonant circuit. Fig.11 In the conventional technology example shown in , two switches (switch 1 and switch 2) are used to periodically stop the resonance at the power feeding coil to detect the frequency difference. In contrast, Fig.12 The circuit uses a method of detecting the resonance state without stopping the power feeding to the power feeding coil 111.

[0131] The wireless power feeding system of the present disclosure includes Fig.12The basic circuit shown in . The resonant capacitor 113 of the power feeder 110 is connected in parallel with the power feeding coil 111. The circuit including the resonant capacitor 113 is generally referred to as a parallel resonant circuit. Meanwhile, the commonly used wireless power feeding system forms a series resonant circuit in which the resonant capacitor is placed in series with the coil. In the case of a parallel resonant circuit, when SW1 is turned on, a stable resonant state is generated, and then when SW1 is turned off, the power feeder 110 continues the resonant state with the power receiver 130 during the radiation of the energy stored in the power receiving coil 131 and the capacitor 133. Here, the frequency tuning circuit (PLL circuit) 115 and the control circuit 117 realize power supply of an appropriate frequency based on the resonant state shift detected by the resonant state sensor 116 connected in parallel with the power feeding coil 111. The resonant state sensor 116 is a sensor that detects the resonant state and detects the shift of the voltage and current and the phase of the resonant frequency.

[0132] Difficult to detect clearly Fig.12 . However, a simple determination as to whether to increase or decrease the resonant frequency or to maintain the resonant frequency can be processed by simulation of many situations obtained by the resonant state sensor 16 and programming based on the simulation. In addition, by detecting the change of the result after tuning and determining whether it is appropriate, control can be performed by trial and error.

[0133] Fig.12 The power receiving coil 131 is a ferrite coil having double windings on one ferrite in two directions. In the circuit diagram, two coils are connected in series. Here, a diode 132 is installed to prevent reverse feeding.

[0134] Fig.13 yes Fig.12 Schematic signal waveform diagram of the basic circuit of the power feeder 110 is shown.

[0135] Fig.13 (A) shows Fig.12 The waveform of the switch circuit 114 shown in FIG. 1 when it is turned on at a high level. In short, when turned on, the power supply 118 is supplied, resulting in an operating state, that is, an operating duration. The disconnection and non-operating duration result in a resonant state, that is, a resonant duration. Fig.12 As shown, when the power feeding coil 111 forms a parallel resonance circuit with the resonance capacitor 113, the power feeder 110 continues to supply energy while it is in a resonance state with the power receiver 130 regardless of being in an operating state or a resonance state.

[0136] Fig.13 (B) shows an operation signal. When the switch circuit 114 is turned on, the power supply 118 is turned on. Fig.13 (C) shows Fig.12 The resonant state sensor 116 detects a sampling signal when it is turned on to detect (sample) a plurality of signals for a sampling duration. Fig.13 (D) shows the input to Fig.12 The received signal of the resonance state sensor 116 is shown in FIG. 1 . This signal shows the state of the power feeding coil 111 in the resonance state. Although the signal waveforms are shown schematically, they are signals with frequency characteristics, and the frequency components can be measured. Generally, the voltage is converted into a digital value by an AD conversion circuit, and the information is sent to the Fig.12 control circuit 117.

[0137] for Fig.13 When the energy in the power feeding coil 111 and the resonance capacitor 113 is supplied to the power receiver 130, the signal strength (voltage) is as follows: Fig.13 By seeing this change, it is possible to simulate whether it resonates well. In addition, the frequency characteristics can be detected as a phase difference. A slight change is found between the resonance and non-resonance of the power feeder 110 and the power receiver 130. Taking all of this into account, the control circuit 117 cooperates with the frequency tuning circuit 115 to tune the frequency at the power supply. In some cases, the frequency mismatch can be intentionally made to see Fig.13 In addition, in the resonance state with the power receiver 130, the control circuit 117 considers the following Fig.13 (D) shows the voltage reduction method to adjust the operation duration.

[0138] in addition, Fig.13 The detection of the resonant state sensor 116 shown in (C) involves energy loss like the power feeder 110. Therefore, instead of performing detection every time, sampling can be performed intermittently, for example once per second to suppress energy loss. In addition, the specifications and resonant frequency of the power supply 118 or the power feeding coil 111 are determined according to the size of the energy to be transmitted or the width or height of the target to be fed with power. The resonant capacitor 113 is usually set according to the specifications of the resonant frequency used as a reference. In practice, their configuration is formed as an enhanced circuit configured after repeated complex simulations. As described above, the control circuit 118 uses a programmable circuit such as a microcontroller or a programmable logic device, and a suitable program can be found after repeated simulation and control according to the program.

[0139] The circuit of the power receiver 130 has a predetermined power receiving coil 131, and at least a diode 132, a capacitor 133 and a rectifier circuit 134. The power receiver 130 has an internal secondary battery 137 embedded therein. The internal secondary battery 137 is a rechargeable secondary battery. The secondary battery can be replaced by a supercapacitor (double-layer capacitor). In this case, the specification or capacity and resonant frequency of the power receiving coil 131 are set according to the amount of energy expected to be received, but first, the capacity expected to be received by the power receiver 130 can be designed. In addition, the power receiving coil capable of receiving power in any direction of the present disclosure is a special ferrite coil having windings on one ferrite in two or three directions. Therefore, according to the winding direction in any direction of the magnetic flux, an electromotive force generated by electromagnetic induction is generated in the coil.

[0140] When electromagnetic induction of a predetermined resonance frequency occurs in the power feeding coil 111 of the power feeder 110, a magnetic flux is generated, for example, Fig.12 . When the power receiving coil 131 of the power receiver 130 enters the end of the magnetic flux line, electric energy is generated by the electromotive force of electromagnetic induction. The energy is recovered and stored in the internal secondary battery 137. In the case of an existing ordinary wireless power feeding device, in many cases, the power receiver 130 includes a communication device for communicating with the power feeder 110 to indicate the state in which the frequency detection circuit and the power receiver 130 are placed. The communication device sends a signal to the power feeder 110, and the power feeder 110 has a structure for tuning an appropriate resonant frequency. In this case, the power receiver 110 requires a predetermined IC circuit.

[0141] In contrast, the present disclosure forms the circuit of the power receiver 130 in a very simple structure. Since this simple configuration makes it possible to charge and discharge at the same time, when the charger is installed in the electronic device, the electronic device can be charged and discharged at the same time to be powered by the wireless power feeding system.

[0142] In addition, the power receiving coil of the present disclosure capable of receiving power in any direction is a special ferrite coil having windings on one ferrite in two or three directions. Therefore, an electromotive force generated by electromagnetic induction is generated in the coil according to the winding direction in any direction of magnetic flux. <<Internal configuration of a power receiver having the same shape as a battery>>

[0143] Fig.151 is a configuration diagram of a power receiver having the same shape as a battery as another embodiment of the power receiver of the present disclosure. The power receiver having the same shape as a battery is housed in a battery-type housing having electrode terminals of the battery. A power receiving coil 131, an internal secondary battery 137, and a power receiving circuit board (capacitor, rectifier circuit, etc.) are housed in the battery-type housing. A shielding plate 136 serving as an electromagnetic shield is installed in the power receiving coil 131. Fig.15 As shown, the power receiving circuit board 135 is placed in the gap of the power receiving coil 131 to fit into a small accommodation volume. While the electrode terminals 139A, 139B are installed in the power receiver case 138 having the same shape as the battery, the electrode terminals 140A, 140B are installed in the power receiving circuit board 135. In order to connect the electrode terminal 139B and the electrode terminal 140B, the electrodes of the internal secondary battery 137 can be used instead of the wiring connection.

[0144] <<Example of using a power receiving coil capable of receiving power in any direction in a battery type power receiver>>

[0145] Fig.16 An example of using a power receiving coil capable of receiving power in any direction in a battery-type power receiver (a power receiver having a power receiver housing having the same shape as a battery) is shown. The power receiving coil 131 is configured to receive power in any direction. In the case of a power receiving coil with a high orientation, it is necessary to match the direction with the magnetic flux direction of the power feeder, but this problem can be solved when the power receiving coil is a ferrite coil with a low orientation (i.e., capable of receiving power in any direction). Since the battery is cylindrical in shape, high orientation is problematic in the case of an ordinary ferrite coil shape when rotating around the cylinder. However, according to the present disclosure, power can be received equally in any rotation.

[0146] The ferrite coil includes at least a coil A and a coil B wound on one ferrite so that the coil winding A and the coil winding B cross each other in the vertical direction. Although two types of windings are shown, it is possible to have three types of windings on one ferrite due to a cylindrical body such as a battery. In this case, it can be used for a spherical power receiving device instead of a cylindrical one, and can respond to 360° rotation in any rotation direction.

[0147] <<Power Feeder for Battery Type Power Receiver>>

[0148] Fig.17 is an embodiment of a power feeder for a battery type power receiver. Fig.17 The power feeder shown in (1) can wirelessly charge a plurality of battery type power receivers at the same time. Fig.17A device with four grooves 122 is shown to wirelessly charge up to four power receivers simultaneously. Since the battery is cylindrical and thus rotatable, the device can have small grooves 122. Fig.17 As shown, the groove 122 may be a curved groove having a size larger than the battery, or conversely, may be a groove smaller than the battery.

[0149] Preferably, the battery type power receiver can realize wireless power feeding when installed in the power receiver housing device. Fig.14 As shown in the picture of the power receiver accommodating device, the battery holder is provided on the rear surface of the device, which accommodates two battery-type power receiving devices, and in this state, since the groove 122 is configured to allow for Fig.17 The power feeder 130 of the battery type power receiver is well positioned so that the secondary battery of the power receiving device can be charged without worry. The power feeder has at least an indicator indicating that charging is in progress, a power switch, a power line, and an AC power source. The power source can be embedded in the power feeder. In addition, the USB of a computer can be used as a power supply device.

[0150]

Industrial Applicability

[0151] According to the wireless power feeding system of the present disclosure, in a device using a battery that needs to be replaced when the power is exhausted, using the product of the present disclosure, a battery replaced by a wireless rechargeable device can be provided. In the case of a battery, when the battery runs out of energy, the battery is removed from the device and discarded. Battery waste has caused social problems. At the same time, it is even necessary to remove the rechargeable battery from the device and charge it with a charger, causing inconvenience. Using the present disclosure, a secondary battery having a power receiving unit that receives power through wireless power feeding has the shape of an ordinary button battery or battery, so it can be used in the same way as a button battery or battery, and accordingly, it can be replaced with a wireless rechargeable device without modifying the device. In addition, it can be replaced with a wireless rechargeable device without making special design changes to the location of the product provider. In addition, there is no need to install a cover for battery replacement in the housing of the electronic device. Therefore, the product design can be improved. In addition, since there is no need to replace the battery, it can be used to manufacture environmentally friendly electronic devices. In addition, using the present disclosure, in the case of a battery-type power receiving device, wireless charging can be performed in the same way as a battery in any rotation direction around a cylinder.

[0152] [Detailed explanation of main elements]

[0153] 10: Power feeder

[0154] 11: Power feeding coil

[0155] 12: Current sensor (R1)

[0156] 13: Resonant capacitor

[0157] 14: Switching circuit

[0158] 15: Frequency tuning circuit

[0159] 16: Resonance state sensor

[0160] 17: Control circuit

[0161] 18: Power supply

[0162] 19: Voltage sensor

[0163] 20: Power feed base

[0164] 21: Possible power feed range

[0165] 22: Groove

[0166] 30: Power Receiver

[0167] 31: Power receiving coil

[0168] 33: Capacitor

[0169] 34: Rectifier circuit

[0170] 35: Power receiving circuit board

[0171] 36: Shielding plate

[0172] 37: Internal secondary battery

[0173] 38: Power receiver housing with the same shape as the battery

[0174] 39: Electrode terminal (housing side)

[0175] 40: Electrode terminal (inside)

[0176] 41: Power receiver housing with the same shape as a button battery

[0177] 42: Cylindrical coil

[0178] 43: Air-core coil

[0179] 44: Ferrite coil

[0180] 45: Power receiving coil support device

[0181] 46: Heavy Objects

[0182] 47: Fixed plate

[0183] 50: External secondary battery

[0184] 51: External secondary battery connection terminal

[0185] 60: Battery holder

[0186] 70: Electronic equipment

[0187] 110: Power feeder

[0188] 111: Power feeding coil

[0189] 113: Resonant capacitor

[0190] 114: Switching Circuit

[0191] 115: Frequency Tuning Circuit

[0192] 116: Resonance State Sensor

[0193] 117: Control circuit

[0194] 118: Power

[0195] 120: Power feed base

[0196] 121: Possible power feed range

[0197] 122: Groove

[0198] 130: Power Receiver

[0199] 131: Power receiving coil

[0200] 133: Capacitor

[0201] 134: Rectifier circuit

[0202] 135: Power receiving circuit board

[0203] 136: Shielding plate

[0204] 137: Internal secondary battery

[0205] 138: Power receiver housing with the same shape as the battery

[0206] 139: Electrode terminal (housing side)

[0207] 139A: (+ side of battery case) electrode terminal

[0208] 139B: (-side of battery housing) electrode terminal

[0209] 140: Electrode terminal (inside)

[0210] 140A: (+ side) electrode terminal (inside)

[0211] 140B: (- side) electrode terminal (inside)

Claims

1. A wireless power feeding system, comprising: a power feeder including a power feeding coil for generating electromagnetic waves and a power feeding circuit unit for supplying power to generate electromagnetic waves in the power feeding coil; as well as A power receiver including a power receiving coil for receiving electromagnetic waves emitted from a power feeding coil by electromagnetic induction, a power receiving circuit unit for recovering energy generated in the power receiving coil, and an internal secondary battery for storing the energy recovered by the power receiving circuit unit, wherein electric energy is supplied from the power feeder to the power receiver by electromagnetic induction using a resonance phenomenon of a predetermined resonance frequency, The power receiver further comprises: A power receiver case having the same outer shape as that of an existing battery and configured to house a power receiving coil, a power receiving circuit unit, and an internal secondary battery, and Two electrodes, set in the same position as in existing batteries, The power feeder further includes a power feeding base in which the power receiver is placed, and The power receiver is mounted in a battery holder embedded in a first electronic device, and in a mounted state, when the power receiver is placed in a power feeding base together with the first electronic device, power is supplied by charging an internal secondary battery via wireless power feeding from the power feeder to the power receiver and simultaneously discharging to a second electronic device, Wherein, the power feeding circuit unit of the power feeder further includes: a resonant capacitor tuned to a resonant frequency to form a parallel resonant circuit in combination with the power feeding coil, a switching circuit that periodically repeats an operation state in which power is supplied to the power feeding coil and a resonance state in which power is supplied to the power feeding coil, a frequency tuning circuit for changing the frequency of the power supplied to the power feeding coil, a control circuit for controlling both the switching circuit and the frequency tuning circuit, and a resonance state sensor for detecting the resonance state of the power feeding coil and outputting a detection signal to the frequency tuning circuit and the control circuit, and The control circuit is configured as: setting the power feeding frequency and the operation duration to obtain an optimum resonance frequency and a stable resonance state according to information from the resonance state sensor, and controlling the switching circuit and the frequency tuning circuit based on the settings, and When the abnormal resonance state is determined, the power feeding is stopped.

2. The wireless power feeding system according to claim 1, wherein: The power receiver further includes an external secondary battery connection terminal for connection of an external secondary battery, and An external secondary battery is connected to the connection terminals to form a large-capacity power receiver.

3. The wireless power feeding system according to claim 1 or 2, wherein: The power receiving coil embedded in the power receiver is a cylindrical or polygonal coil, and is an air-core coil or a ferrite coil in which a coil is wound around a cylindrical or polygonal ferrite.

4. The wireless power feeding system according to claim 1 or 2, wherein: The power receiver housing has the same shape as an existing battery, and The wireless power feeding system further includes a power receiving coil supporting device which is rotatable to guide the power receiver toward a predetermined direction when the power receiver is placed in the power feeding base.

5. The wireless power feeding system according to claim 3, wherein: The power receiver housing has the same shape as an existing battery, and The wireless power feeding system further includes a power receiving coil supporting device which is rotatable to guide the power receiver toward a predetermined direction when the power receiver is placed in the power feeding base.

6. The wireless power feeding system according to any one of claims 1, 2 and 5, wherein: The power feeding base has a shape, form or color representing a suitable power feeding range and has at least one groove, and The groove allows the power receiver case to be placed without rolling if the power receiver case is cylindrical, and is configured to place the first electronic device having the power receiver embedded therein.

7. The wireless power feeding system according to claim 3, wherein: The power feeding base has a shape, form or color representing a suitable power feeding range and has at least one groove, and The groove allows the power receiver case to be placed without rolling if the power receiver case is cylindrical, and is configured to place the first electronic device having the power receiver embedded therein.

8. The wireless power feeding system according to claim 4, wherein: The power feeding base has a shape, form or color representing a suitable power feeding range and has at least one groove, and The groove allows the power receiver case to be placed without rolling if the power receiver case is cylindrical, and is configured to place the first electronic device having the power receiver embedded therein.

9. A wireless power feeding system, comprising: a power feeder including a power feeding coil for generating electromagnetic waves and a power feeding circuit unit for supplying power to generate electromagnetic waves in the power feeding coil; and A power receiver including a power receiving coil for receiving electromagnetic waves emitted from a power feeding coil by electromagnetic induction, a power receiving circuit unit for recovering energy generated from the power receiving coil, and an internal secondary battery for storing the energy recovered by the power receiving circuit unit, wherein electric energy is supplied from the power feeder to the power receiver by electromagnetic induction using a resonance phenomenon of a predetermined resonance frequency, The power receiver further comprises: a power receiver case having the same outer shape as that of an existing battery and configured to house a power receiving coil, a power receiving circuit unit, and an internal secondary battery, and Two electrodes, set in the same position as in existing batteries, The power feeder further includes a power feeding base in which the power receiver is placed, and The power receiving coil of the power receiver is a ferrite coil having windings in a plurality of winding directions on one ferrite, each winding being connected in series, and magnetic flux passes through the power receiving coil in any rotation direction to generate an electromotive force by electromagnetic induction, Wherein, the power feeding circuit unit of the power feeder further includes: a resonant capacitor tuned to a resonant frequency to form a parallel resonant circuit in combination with the power feeding coil, a switching circuit that periodically repeats an operation state in which power is supplied to the power feeding coil and a resonance state in which power is supplied to the power feeding coil, a frequency tuning circuit for changing the frequency of the power supplied to the power feeding coil, a control circuit for controlling both the switching circuit and the frequency tuning circuit, and a resonance state sensor for detecting the resonance state of the power feeding coil and outputting a detection signal to the frequency tuning circuit and the control circuit, and The control circuit is configured as: setting the power feeding frequency and the operation duration to obtain an optimum resonance frequency and a stable resonance state according to information from the resonance state sensor, and controlling the switching circuit and the frequency tuning circuit based on the settings, and When the abnormal resonance state is determined, the power feeding is stopped.

10. The wireless power feeding system according to claim 9, wherein: The power receiver housing has the same shape as an existing battery and is mounted on a battery holder embedded in a first electronic device, and in the mounted state, when the power receiver is placed in a power feeding base together with the first electronic device, power is supplied in the following manner: the internal secondary battery is charged via wireless power feeding from the power feeder to the power receiver and simultaneously discharged to the second electronic device.

11. The wireless power feeding system according to claim 10, wherein: In the power receiver, the internal secondary battery is embedded in a spherical or polygonal case, The winding of the ferrite coil as the power receiving coil of the power receiver is a ferrite coil having windings in at least 3 directions on at least one ferrite, each winding being connected in series, and Even in the case where the power receiver faces any direction relative to the power feeder and even rolls, power is supplied by charging the internal secondary battery via wireless power feeding and simultaneously discharging to the second electronic device.

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