throbber
CERTIFICATE OF TRANSLATION ACCURACY
`
`I, Michael Fletcher, declare:
`
`1. I am a native speaker of English and am well versed in both the Japanese and English languages
`and have over 18 years of experience translating Japanese technical documents into English on a
`full-time basis.
`
`2. The following translation of the corresponding source text from Japanese into English is accurate
`and complete to the best of my knowledge.
`
`I declare under penalty of perjury under the laws of the United States of America that the foregoing is
`true and accurate.
`
`Statements made herein are to the best of my knowledge true and are based on information that I
`believe to be true and further these statements were made with the knowledge that willful false
`statements and the like so made are punishable by fine or imprisonment, or both, under Section 1001
`of Title 18 of the United States Code and that such willful false statements may jeopardize the validity
`of the patent application in the United States of America or any patent issuing thereon.
`
`Executed this 10th day of February 2022, at Parowan, UT.
`
`Michael Fletcher
`
`
`
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0001
`
`

`

`
`
`(19) Japanese Patent
`Office (JP)
`
`
`(12) Patent Publication Gazette
`(B2)
`
`JP3692541B2 Sept. 7, 2005
`
` (11) Patent No.
` P3692541 (P3692541)
`
`(45) Date Issued: Sep 7, 2005
`ID Number
`(51) Int. Cl
`H 02 J 17/00
`
`H 02 J 7/00
`
`
`
`
`JPO File Number
`H 02 J
`17/00
`H 02 J
`7/00
`
`
`
`
`
`
`
`
` (24) Registration date: Jul. 1, 2005
`FI
`
`Theme code (ref.)
`B
`301D
`Number of Claims: 14 Total pages: 20
`
`
`
`
`(73) Patentee
`Sony Corporation
`
`
`7-35, Kitashinagawa 6-chome, Shinagawa-ku,
`
`
`Tokyo, Japan
`
`
`(74) Agent, Attorney, or Firm:
`
`
`
`Patent Attorney TANABE, Keiki
`(72) Inventor:
`NAGAI, Tamizi
`
`c/o Sony Corporation 7-35, Kitashinagawa 6-chome,
`
`Shinagawa-ku, Tokyo, Japan
`(72) Inventor:
`TAKEI, Toshitaka
`
`c/o Sony Corporation 7-35, Kitashinagawa 6-chome,
`
`Shinagawa-ku, Tokyo, Japan
`(72) Inventor:
`SUZUKI, Kuniharu
`
`c/o Sony Corporation 7-35, Kitashinagawa 6-chome,
`
`Shinagawa-ku, Tokyo, Japan
`
`
`
`
`
`(21) Filed Appln. No.: H10-532727
`
`(86) (22) Filed: Feb. 3, 1998
`(86) International application
`number: PCT/JP1998/000441
`(87) International publication
`number: W01998/034319
`(87) International Filing Date:
` Aug. 6, 1998
`Examination Request: Dec. 7, 2004
`(31) Priority Claim number:
` H09-20739
`(32) Priority Date: Feb. 3, 1997
`(33) Priority claiming country: JP
`
`
`10
`
`20
`
`
`
`
`
`
`
`Continued on last page
`
`(54) TITLE OF THE INVENTION
`
`POWER TRANSFER DEVICE AND POWER TRANSFER METHOD
`
`(57) What is claimed is:
`[Claim 1]
`A power transmission device designed to transmit power between a primary coil and a secondary coil, comprising:
` signal generator means for generating and outputting an oscillation signal of a prescribed frequency;
` current supply means for supplying current to be conducted on the primary coil;
` drive means for driving and controlling conduction and interruption of the current supplied from the current supply means to the
`primary coil based on the frequency of the oscillation signal;
` the primary coil, which generates time-varying magnetic flux based on the frequency of the oscillation signal by conduction and
`interruption of the current based on the drive control; and
` the secondary coil, having a capacitance element connected in parallel, an induced electromotive force produced in accordance with
`the time varying magnetic flux interlinkage generated in the primary coil, and a higher resonant frequency than the frequency of the
`oscillation signal, and that together with the capacitance element, resonates the induced current generated based on the induced
`electromotive force; wherein
` power is transferred from the primary coil to the secondary coil based on the time varying magnetic flux interlinkage generated in the
`primary coil generating the induced electromotive force in the secondary coil.
`
`[Claim 2]
`The power transfer device according to claim 1, wherein
` the secondary coil rectifies and outputs the induced current generated by conduction and interruption of current in the primary coil.
`
`
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0002
`
`

`

`JP3692541B2 Sept. 7, 2005
`
`
`[Claim 3]
`The power transfer device according to claim 1, wherein
` the primary coil and secondary coil are respectively wound around cores with a prescribed shape, and
` the core with the primary coil wound thereon and the core with the secondary coil wound thereon are arranged in a position with the
`centers thereof mutually offset.
`
`[Claim 4]
`The power transfer device according to claim 3, wherein
` the core with the primary coil wound thereon is formed with a larger cross-sectional area as compared to the core with the secondary
`coil wound thereon.
`
`[Claim 5]
`The power transfer device according to claim 1, comprising:
` detection means for detecting predetermined parameter fluctuations occurring in the primary coil;
` control means that outputs a first or second control signal based on the detection results;
` intermittent oscillation means that supplies the oscillation signal intermittently to the drive means at a prescribed timing for a
`prescribed amount of time if the first control signal is supplied and supplies the oscillation signal to the drive means continuously if
`the second control signal is supplied.
`
`[Claim 6]
`The power transfer device according to claim 1, comprising:
` a tertiary coil provided separately from the primary coil and secondary coil;
` detection means for detecting prescribed parameter fluctuations occurring in the tertiary coil;
` control means that outputs a first or second control signal based on the detection results;
` intermittent oscillation means that supplies the oscillation signal intermittently to the drive means at a prescribed timing for a
`prescribed amount of time if the first control signal is supplied and supplies the oscillation signal to the drive means continuously if
`the second control signal is supplied.
`
`[Claim 7]
`The power transfer device according to claim 6, wherein
` the tertiary coil is arranged in the vicinity of the secondary coil and in a position that interlinks with the magnetic flux generated in
`the primary coil.
`
`[Claim 8]
`The power transfer device according to claim 6 with the tertiary coil arranged in a position facing a prescribed metal member arranged
`in a prescribed position of an electronic device having the secondary coil, comprising:
` second signal generating means that generates and outputs a second oscillation signal at a prescribed frequency;
` second current supply means that supplies current conducted in the tertiary coil; and
` second drive means that drives and controls the current supplied from the second power supply means conducted in the tertiary coil
`based on the frequency of the second oscillation signal.
`
`[Claim 9]
`A method of power transmission designed to transmit power between a primary coil and a secondary coil in an non-contact manner,
`comprising:
` driving and controlling current conduction in the primary coil based on the oscillation signal with a prescribed frequency;
` producing time-varying magnetic flux in the primary coil through conduction and interruption of the current based on the drive
`control at the frequency of the oscillation signal; and
` resonating the current induced by the induced electromotive force of the secondary coil from interlinkage with magnetic flux
`generated in the primary coil for transferring power from the primary coil to the secondary coil and generated by the induced
`electromotive force at a frequency higher than the oscillation signal frequency.
`
`
`
`(2)
`
`
`
`10
`
`20
`
`30
`
`40
`
`50
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0003
`
`

`

`(3)
`
`JP3692541B2 Sept. 7, 2005
`
`
`[Claim 10]
`The method of power transfer according to claim 9, wherein
` the induced current generated in the secondary coil at the timing when current conduction in the primary coil is interrupted is rectified
`and output.
`
`[Claim 11]
`The method of power transfer according to claim 9, wherein
` the primary coil and secondary coil consist of each being wound on a prescribed shaped core and the core centers thereof are arranged
`in mutually offset positions.
`
`[Claim 12]
`The method of power transfer according to claim 11, wherein
` the cross-sectional area of the core on which the primary coil is wound is larger than the cross-sectional area of the core on which the
`secondary coil is wound.
`
`[Claim 13]
`The method of power transfer according to claim 9, comprising:
` a detecting step of detecting prescribed parameter fluctuations that occur in the primary coil;
` a controlling step of outputting a first or second control signal depending on the detection results; and
` an intermittent oscillation switching step of driving and controlling intermittent conduction and interruption in the primary coil at
`prescribed timing if the first control signal is supplied and driving and controlling continuous conduction and interruption in the
`primary coil if the second control signal is supplied.
`
`[Claim 14]
`The method of power transfer according to claim 9, comprising:
` a detecting step of detecting prescribed parameter fluctuations that occur in a tertiary coil provided separately from the primary coil
`and the secondary coil;
` a controlling step of outputting a first or second control signal depending on the detection results; and
` an intermittent oscillation switching step of driving and controlling intermittent conduction and interruption in the primary coil at
`prescribed timing if the first control signal is supplied and driving and controlling continuous conduction and interruption in the
`primary coil if the second control signal is supplied.
`
`DETAILED DESCRIPTION OF THE INVENTION
`TECHNICAL FIELD
`The present invention relates to a power transfer device and a power transfer method, and is suitable for application to a power
`transfer device and a power transfer method used for a charging device that charges a secondary battery built into a small portable
`electronic device via a non-contact terminal, for example.
`
`BACKGROUND ART
`In recent years, the demand for small portable electronic devices such as headphone stereos, camera-integrated VTRs, and mobile
`communication terminal devices with reduced size has been increasing. These small portable electronic devices have a high-capacity
`rechargeable secondary battery built in as a power source, which is charged using a prescribed charging device.
`One such charging device is a contact type. A contact-type charging device has a spring-type electrical contact, for example, and the
`electrical contact on the small portable electronic device is brought into contact with this contact to electrically connect the two, and
`the charging current is supplied to the secondary battery in the small portable electronic device through the electrical path thus formed.
`
`However, in this type of charging device, the contact parts may become oxidized or contaminated over time. This manner of oxidation
`and contamination will cause poor contact between the two contact points, which will inhibit the supply of charging current to the
`secondary battery.
`A charging device that uses a non-contact type charging method is considered to avoid this manner of problems. One possible non-
`contact charging method is to supply charge current from the charging device to the secondary battery using electromagnetic
`induction.
`
`In other words, the primary coil is provided at the terminal on the charging device side, and the secondary coil is provided at the
`terminal on the small portable electronic device side, with the primary and secondary coils close together. When a current is applied to
`the primary coil under these conditions, the primary coil generates a magnetic flux. For example, if the current flowing in the primary
`coil is turned ON and OFF at regular intervals, the magnetic flux generated by the conduction of the current will vary with time. On
`the secondary coil side, the induced electromotive force is generated by electromagnetic induction due interlinkage of time-varying
`magnetic flux. The secondary coil uses the induced electromotive force as a power source to generate alternating current as AC
`current, with the direction of the current reversing according to the ON and OFF of the primary coil side conduction. The non-contact
`charging device performs charging by supplying the induction current generated in the secondary coil as the charging current to the
`secondary battery.
`
`
`10
`
`20
`
`30
`
`40
`
`50
`
`60
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0004
`
`

`

`JP3692541B2 Sept. 7, 2005
`(4)
`
`In this manner, the primary coil on the charging device side and the secondary coil on the small portable electronic device side are
`brought into close proximity during charging, and power is transmitted from the primary coil side to the secondary coil side using a
`magnetic connection through electromagnetic induction. A non-contact charging device can be implemented in this manner.
`
`In a charging device of this configuration, the primary and secondary coils are built into the charging device and electronic device,
`respectively, and power is transmitted from the primary coil to the secondary coil by electromagnetic induction enabling non-contact
`power transfer.
`
`However, in such a case, the coupling coefficient between the primary and secondary coils becomes worse with increased space
`between the primary and secondary coils (for the specific magnetic permeability of air), and the amount of magnetic flux generated in
`the primary coil interlinked to the secondary coil is reduced. For this reason, compared to a general transformer, a high degree of
`coupling is difficult to achieve between the primary coil and the secondary coil in such a power transmission device.
`
`This leads to the problem of low power transmission efficiency in power transmission devices as described above, due to power loss
`caused by low coupling.
`
`DISCLOSURE OF THE INVENTION
`The present invention came about in light of the points described above and proposes a power transfer device and power transfer
`method that improves the power transfer efficiency from the primary coil side to the secondary coil side.
`In order to resolve the problems described above, the present invention is a power transmission device designed to transmit power
`between a primary coil and a secondary coil and includes:
` signal generator means for generating and outputting an oscillation signal of a prescribed frequency;
` current supply means for supplying current to be conducted in the primary coil;
` drive means for driving and controlling conduction and interruption of the current supplied from the current supply means to the
`primary coil based on the frequency of the oscillation signal;
` the primary coil, which generates time-varying magnetic flux based on the frequency of the oscillation signal by conduction and
`interruption of the current based on the drive control; and
` the secondary coil, having a capacitance element connected in parallel, an induced electromotive force produced in accordance with
`the time varying magnetic flux interlinkage generated in the primary coil, and a higher resonant frequency than the frequency of the
`oscillation signal, and that together with the capacitance element, resonates the induced current generated based on the induced
`electromotive force; wherein
` induced electromotive force is transferred to the secondary coil through interlinkage of the time-varying magnetic flux generated in
`the primary coil.
`
`In this manner, the resonant frequency of the secondary coil side is set to a higher frequency than the frequency of the transmission
`signal of the primary coil side, which makes the apparent coupling coefficient between the primary and secondary coils higher by
`reducing capacitance and this enables increasing the power transfer efficiency from the primary coil to the secondary coil.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`FIG. 1 is a circuit diagram illustrating a configuration of a charging device and an electronic device according to embodiment 1 of the
`present invention.
`FIG. 2 is a circuit diagram illustrating the equivalent circuit of the electromagnetic induction part.
`FIG. 3 is a chart describing the relationship between the drive frequency of the primary coil and the resonant frequency of the
`secondary coil.
`FIG. 4 is a chart describing the drive voltage provided to the primary coil according to the drive frequency.
`FIG. 5 is a chart describing the induced voltage generated in the secondary coil.
`FIG. 6 is a circuit diagram illustrating a configuration of a charging device and an electronic device according to embodiment 2 of the
`present invention.
`FIG. 7 is a chart describing the induced voltage generated in the secondary coil.
`FIG. 8 is a schematic diagram illustrating a configuration of a charging device and an electronic device according to embodiment 3 of
`the present invention.
`FIG. 9 is a block diagram illustrating a configuration of a charging device and an electronic device according to embodiment 4 of the
`present invention.
`FIG. 10 is a chart illustrating control of induced voltage on the secondary coil side by varying the frequency of the primary coil side.
`
`
`
`
`
`10
`
`20
`
`30
`
`40
`
`50
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0005
`
`

`

`JP3692541B2 Sept. 7, 2005
`
`(5)
`
`FIG. 11 is a chart describing maintaining of the induced voltage in the embodiments.
`FIG. 12 is a flowchart describing the procedure of frequency control through voltage detection.
`FIG. 13 is a block diagram illustrating a configuration of a charging device and an electronic device according to embodiment 5 of the
`present invention.
`FIG. 14 is a block diagram illustrating a configuration of a charging device according to embodiment 6 of the present invention.
`FIG. 15 is a block diagram illustrating a configuration of a charging device according to another embodiment.
`FIG. 16 is a block diagram illustrating a configuration of a charging device according to another embodiment.
`
`DESCRIPTION OF THE PREFERRED EMBODIMENTS
`Embodiments are described in detail using figures below.
`(1) Embodiment 1
`In FIG. 1, 1 illustrates the charging device as a whole, which is designed to charge the secondary battery in a prescribed electronic
`device by supplying power from a power supply 2 to the secondary battery built into the prescribed electronic device via an
`electromagnetic induction part 3. The electromagnetic induction part 3 consists of a primary coil L1 provided on the charging device 1
`side and a secondary coil L2 provided in the electronic device. The primary coil L1 and the secondary coil L2 are in a non-contact
`state. The primary coil L1 is arranged with a first terminal connected to the power supply 2, and the secondary coil L2 has both
`terminals connected to the secondary battery. The charging device 1 is set up with the primary coil L1 and secondary coil L2 each
`wound around a core of a prescribed shape, and the two cores are arranged so that they are facing each other during charging.
`
`In the charging device 1 a second terminal of the primary coil L1 is connected to a drive circuit 4, and the drive circuit 4 is connected
`to the drive frequency generator 5. The drive frequency generator 5 generates an outgoing signal with a prescribed frequency fOSC
`which is then supplied to the drive circuit 4. The outgoing signal thus provided to the drive circuit 4 is input to the base electrode of an
`emitter-grounded transistor Tr1 thereof. The transistor Tr1 conducts current between the emitter and collector electrodes thereof when
`the voltage level of the oscillation signal input to the base electrode is positive. This allows the current delivered by the power supply
`2 to flow into the primary coil L1.
`
`When the voltage level of the oscillation signal input to the base electrode of the transistor Tr1 becomes negative, the transistor Tr1
`cuts off conduction between the emitter and collector electrodes thereof. In this state, the current delivered from the power supply 2
`does not flow to the primary coil L1, and the LC circuit consisting of the primary coil L1 and the capacitor C1 of the drive circuit 4
`forms a resonance circuit generating a counter electromotive force in the primary coil L1. The voltage generated by this counter
`electromotive force is used as a power source to charge the capacitor C1, and when the capacitor C1 discharges to the primary coil, the
`current flows in the reverse direction in the primary coil L1. The current increases as the voltage of the capacitor C1 decreases, and
`reaches a maximum when the voltage of the capacitor C1 reaches zero. Thereafter, the capacitor C1 is charged by the voltage in the
`opposite direction. When the voltage exceeds the voltage of the power supply 2, the damper diode D1 in the drive circuit 4 conducts,
`causing the LC circuit to short-circuit. The LC circuit stops oscillating, and the current flowing in the primary coil L1 decreases
`linearly. When the current reaches zero, the transistor Tr1 turns ON, and the operation described above is repeated thereafter. In this
`manner, the current generated by the drive circuit 4 flowing in the primary coil L1 oscillates alternately in the forward and reverse
`directions. The voltage generated in primary coil L1 is a horizontal pulse shape that changes based on the drive frequency fOSC
`delivered from the drive frequency generator 5.
`
`The flow of current generates magnetic flux in the primary coil L1, and the flux changes with time according to the oscillation of the
`current described above. Induced electromotive force is generated in the secondary coil L2 based on the time-varying magnetic flux
`interlinked to the secondary coil L2. Based on the induced electromotive force thereof, this causes current that reverses with the time
`variation of the magnetic flux to flow in the secondary coil L2. This current oscillates (resonates) based on the secondary coil L2 and
`capacitor C2 connected in parallel to the secondary coil L2. Thus, the AC induced current generated in the secondary coil L2 is sent
`out through a diode D2. In electronic devices with a secondary coil L2, the induced current generated by the induced electromotive
`force as a power supply is rectified by the diode D2 and supplied to the secondary battery to perform charging. The charging device 1
`uses electromagnetic induction to transmit power supply 2 power from the primary coil L1 to the secondary coil L2 for charging.
`
`
`
`
`
`10
`
`20
`
`30
`
`40
`
`50
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0006
`
`

`

`JP3692541B2 Sept. 7, 2005
`(6)
`
`FIG. 2 illustrates an equivalent circuit of the electromagnetic induction part 3, and LS2, illustrated in the diagram, is leakage
`inductance on the secondary coil L2 side.
`
`As illustrated in FIG. 3, in the charging device 1, when the frequency of the induced voltage, or resonant frequency, generated in the
`secondary coil L2 by the inverted induced electromotive force, is set to fOUT, the resonant frequency fOUT is set higher than the
`frequency at which the current flowing in the primary coil L1 is driven and controlled, or in other words, the drive frequency fOSC. The
`setting of the resonant frequency fOUT relative to the drive frequency fOSC is performed, for example, by adjusting the ratio of the
`number of turns of the secondary coil L2 to the number of turns of the primary coil, or by adjusting the capacitance of the resonance
`capacitor C2 connected in parallel to the secondary coil L2.
`
`As illustrated in FIG. 4, current flows in the primary coil L1 in the forward and reverse directions according to the ON and OFF states
`of the transistor Tr1 of the drive circuit 4, and the voltage generated in the primary coil L1 appears as a pulse waveform with the drive
`frequency fOSC. Here, e1 is the power component generated in the primary coil L1 when the transistor Tr1 is OFF, and e2 is the power
`component generated in the primary coil L1 when the transistor Tr1 is ON.
`
`As illustrated in FIG. 5, the time variation of the magnetic flux generated in the primary coil L1 generates an induced voltage at the
`resonant frequency fOUT. Here, e3 and e4 indicate the power components based on the voltage and current generated in the secondary
`coil L2. The power component e3 corresponds to the power component e1, and is generated in the secondary coil L2 when Tr1 is in
`the OFF state. Also, power component e4 corresponds to the power component e2, and is generated in the secondary coil L2 when Tr1
`is OFF [sic]. In an electronic device with a secondary coil L2, the induced current generated in the power component e3 is rectified
`and the power is extracted and supplied to the secondary battery. Since the winding direction of the primary coil L1 is opposite to that
`of the secondary coil L2, the drive frequency generated in the primary coil L1 and the resonant frequency generated in the secondary
`coil L2 are opposite in waveform.
`
`In the configuration described above, the transistor Tr1 of the drive circuit 4 is turned ON and OFF according to the frequency of the
`oscillation signal generated by the drive frequency generator 5. When the transistor is in the ON state, the current delivered from the
`power supply 2 flows into the primary coil L1. When the transistor Tr1 is in the OFF state, a counter electromotive force is generated
`in the primary coil L1 and the capacitor C1 is charged, and then the discharge from the capacitor C1 causes a current to flow in the
`primary coil L1 in the opposite direction to that when the transistor Tr1 is on. As the current direction reverses, the magnetic flux
`generated in the primary coil L1 varies with time.
`
`The electromotive force induced in the secondary coil L2 is generated by the magnetic flux interlinkage present in the primary coil L1,
`and the direction of the induced electromotive force changes in accordance with the time variation of the magnetic flux. Because of
`the reversal of the induced electromotive force, induced voltage is generated in the secondary coil L2 at the resonant frequency fOUT
`relative to the drive frequency fOSC of the primary coil L1.
`
`If the resonant frequency fOUT of the LC circuit on the secondary coil L2 side is set to be the same frequency as the drive frequency
`fOSC of the primary coil L1, the current conducted in the primary coil L1 is in phase with the voltage due to resonance. Therefore,
`when the voltage level is at a maximum, the current level is also at a maximum. If the secondary coil L2 side resonates at such a
`frequency, the power loss due to the internal impedance of the secondary coil L2 side LC circuit becomes large, and the power
`transmission efficiency cannot be improved.
`
`When the resonant frequency fOUT is set to be less than the drive frequency fOSC of the primary coil L1, the current value of the
`induced current generated on the secondary coil L2 side becomes small due to resonance at a frequency different than the drive
`frequency fOSC. However, since the time interval required for charging and discharging the resonance capacitor C2 connected in
`parallel to the secondary coil L2 becomes longer, equivalent capacitance C becomes larger and actual efficiency Q decreases, so a
`higher output voltage cannot be obtained.
`
`The induced current in the secondary coil L2 is an alternating current as described above, and by increasing the induced voltage and
`decreasing the induced current, the power loss due to internal impedance can be reduced and power can be extracted efficiently. As
`such, the induced voltage obtained on the secondary coil L2 side needs to be as high as possible.
`
`
`
`
`
`10
`
`20
`
`30
`
`40
`
`50
`
`GOOGLE AND SAMSUNG EXHIBIT 1006, 0007
`
`

`

`JP3692541B2 Sept. 7, 2005
`(7)
`
`Therefore, as described above, for the charging device 1, the resonant frequency fOUT of the secondary coil L2 side is set to be higher
`than the drive frequency fOSC of the primary coil L1 side, so that the resonant current can be set low and the actual efficiency Q can be
`increased by reducing the equivalent capacitance C in the resonance circuit of the secondary coil L2 side. This allows the charging
`device 1 to improve the power transmission efficiency from the primary coil L1 to the secondary coil L2 by increasing the apparent
`coupling coefficient.
`
`On the electronic equipment side having the secondary coil L2, the part of the power component e3 from the induction current
`generated in the secondary coil L2 when the transistor Tr1 is OFF based on direction reversal of the current flowing in the primary
`coil L1 is rectified and extracted. In other words, the areas of the power components e3 and e4 (FIG. 5) are equal, and the current
`width T2 of the power component e4 is narrower than the current width T1 of the power component e3, and the voltage value of the
`power component e4 is larger than the voltage value of the power component e3. Therefore, when the power component e4 is rectified
`and extracted as power, a high output voltage can be obtained, but the current width T2 is narrower than the current width T1 of the
`power component e3, and the rectification conduction angle is also narrower, resulting in a more unstable output power supply than
`when the power component e3 is rectified.
`
`In the charging device 1, the induced current of the power component e3 is rectified on the electronic device side with the secondary
`coil L2 to extract power, which allows the rectification conduction angle to be made wider, and stable power supply power can be
`extracted.
`
`According to the above configuration, when power is transmitted from the primary coil L1 to the secondary coil L2 by
`electromagnetic induction between the primary coil L1 and the secondary coil L2, the resonant frequency fOUT generated on the
`secondary coil L2 side is set to a frequency higher than the drive frequency fOSC of primary coil L1. At the same time, the resonant
`voltage of the power component e3 when the transistor Tr1 is in the OFF state is rectified from the resonant voltage generated on the
`secondary coil L2 side to extract the power supply power. As a result, the power supply power can be obtained from the resonant
`voltage with a wide rectification conduction angle while the apparent coupling coefficient can be increased by increasing the actual
`efficiency Q. Thus, the power transmission efficiency can be improved and stable power supply power can be extracted.
`
`(2) Embodiment 2
`In FIG. 6, which illustrates the corresponding parts of FIG. 1 with the same signs, 10 illustrates a charging device, which has almost
`the same configuration as the charging device 1, including a power supply 2, an electromagnetic induction part 3, a drive circuit 4, and
`a drive frequency generator 5. The charging device 10 has a primary coil L1 wound around a core of a prescribed shape as the
`electromagnetic induction part 3 (FIG. 1). When charging, a core with a secondary coil L2 wound thereon is installed in the electronic
`device at a position opposite to the core with the primary coil L1 wound thereon.
`
`The charging device 10 turns the transistor Tr1 of the drive circuit 4 ON and OFF based the oscillation signal generated by the drive
`frequency generator 5 to drive and control the conduction to and cut-off of the primary coil L1 to cause current to flow alternately in
`the forward and reverse directions in the primary coil L1. In this manner, the current flowing in the forward and reverse directions
`generates a time-varying magnetic flux in the primary coil L1, and the magnetic flux interlinkage generates an induced electromotive
`force in the secondary coil L2, and resonant current flows through the LC resonance circuit with the secondary coil L2 and the
`capacitor C2 connected in parallel thereto. Similar to the charging device 1, the charging device 10 is designed so that the resonant
`frequency of the secondary coil L2 is higher than the drive frequency of the primary coil L1 (FIG. 3).
`
`In addition thereto, in the charging device 10, the secondary coil L2 is formed by connecting two coils wound in the same direction, as
`opposed to the charging device 1, where the secondary coil L2 is formed using a single coil. In other words, the charging device 10
`forms an electromagnetic induction part 3 by connecting coils L2A and L2B in series as the secondary coil L2. The resonance circuit

This document is available on Docket Alarm but you must sign up to view it.


Or .

Accessing this document will incur an additional charge of $.

After purchase, you can access this document again without charge.

Accept $ Charge
throbber

Still Working On It

This document is taking longer than usual to download. This can happen if we need to contact the court directly to obtain the document and their servers are running slowly.

Give it another minute or two to complete, and then try the refresh button.

throbber

A few More Minutes ... Still Working

It can take up to 5 minutes for us to download a document if the court servers are running slowly.

Thank you for your continued patience.

This document could not be displayed.

We could not find this document within its docket. Please go back to the docket page and check the link. If that does not work, go back to the docket and refresh it to pull the newest information.

Your account does not support viewing this document.

You need a Paid Account to view this document. Click here to change your account type.

Your account does not support viewing this document.

Set your membership status to view this document.

With a Docket Alarm membership, you'll get a whole lot more, including:

  • Up-to-date information for this case.
  • Email alerts whenever there is an update.
  • Full text search for other cases.
  • Get email alerts whenever a new case matches your search.

Become a Member

One Moment Please

The filing “” is large (MB) and is being downloaded.

Please refresh this page in a few minutes to see if the filing has been downloaded. The filing will also be emailed to you when the download completes.

Your document is on its way!

If you do not receive the document in five minutes, contact support at support@docketalarm.com.

Sealed Document

We are unable to display this document, it may be under a court ordered seal.

If you have proper credentials to access the file, you may proceed directly to the court's system using your government issued username and password.


Access Government Site

We are redirecting you
to a mobile optimized page.





Document Unreadable or Corrupt

Refresh this Document
Go to the Docket

We are unable to display this document.

Refresh this Document
Go to the Docket