Office Action 4: Notice of Allowance (2025-05-02)

CLAIMS:
Amendments to the Claims:

1\. (Currently Amended) A contactless power feeding apparatus comprising a power transmitting apparatus and a power receiving apparatus to which power is contactlessly transmitted from the power transmitting apparatus, wherein the power transmitting apparatus comprises:a transmission coil for supplying power to the power receiving apparatus;
a power supply circuit configured to supply AC power having a predetermined drive frequency to the transmission coil;
a first capacitor connected between the power supply circuit and a first end of the transmission coil;
a first coil connected between the power supply circuit and the first end or a second end of the transmission coil;
a second capacitor connected at a first end to the first capacitor, and
connected at a second end to the first end of the transmission coil; and
a control circuit configured to control the power supply circuit such that AC power having the drive frequency is supplied to the transmission coil,
the power receiving apparatus comprises a receiver coil for receiving power via the transmission coil of the power transmitting apparatus, and a resonant circuit comprising a resonance capacitor that resonates together with the receiver coil, and
the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coil.

2\. (Currently Amended) The contactless power feeding apparatus according to claim 1, wherein, in the power transmitting apparatus, an inductance of the transmission coil, \[\[an\]\]the electrostatic capacitance of the first capacitor, and the electrostatic capacitance of the second capacitor are set such that a closed loop resonance frequency of a closed

Appl. No. 18/058,060 OMR.065.0653.NP Response to the Non-Final Office Action of August 28 2024 loop constituted by the transmission coil, the first capacitor, and the second capacitor is higher than the drive frequency.

OFFICE ACTION:
DETAILED ACTION
Notice of Pre-AIA  or AIA  Status
The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA .
Response to Arguments
Applicant’s arguments, see pages 4-9, filed 2/21/2025, with respect to claims 1-2 have been fully considered and are persuasive.  The rejection of claims 1-2 has been withdrawn.
Allowable Subject Matter
Claims 1-2 are allowed.
The following is an examiner’s statement of reasons for allowance: Independent claim 1 is currently believed to be in condition for allowance. While the prior art of record discloses a similar power feeding apparatus and system, the prior art of record fails to appropriately teach or suggest, “the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coil,” as currently claimed. Said limitation, when taken into consideration with the claim language in its entirety, appears to be directed towards a non-obvious improvement over the prior art of record. For these reasons, inter alia, the claims are currently believed to be in condition for allowance. Claim 1, the sole independent claim, is presented below.
Claim 1:  A contactless power feeding apparatus comprising a power transmitting apparatus and a power receiving apparatus to which power is contactlessly transmitted from the power transmitting apparatus, wherein
the power transmitting apparatus comprises:
a transmission coil for supplying power to the power receiving apparatus;
a power supply circuit configured to supply AC power having a predetermined drive frequency to the transmission coil;
a first capacitor connected between the power supply circuit and a first end of the transmission coil;
a first coil connected between the power supply circuit and the first end or a second end of the transmission coil;
a second capacitor connected at a first end to the first capacitor, and connected at a second end to the first end of the transmission coil; and
a control circuit configured to control the power supply circuit such that AC power having the drive frequency is supplied to the transmission coil,
the power receiving apparatus comprises a receiver coil for receiving power via the transmission coil of the power transmitting apparatus, and a resonant circuit comprising a resonance capacitor that resonates together with the receiver coil, and
the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coil.
Any comments considered necessary by applicant must be submitted no later than the payment of the issue fee and, to avoid processing delays, should preferably accompany the issue fee.  Such submissions should be clearly labeled “Comments on Statement of Reasons for Allowance.”
Conclusion

APPLICANT REBUTTAL: Remarks
Claims 1-2 were pending in the present application. By this amendment, claims 1 and 2 are amended, no claims are canceled and no new claims are added. Support for the amendments may be found in the specification. Therefore, no new matter is entered. After entry of the amendment, claims 1 and 2 will remain pending in the present application for reconsideration.
Summary of the Office Action
In the Non-final Office Action of August 28, 2024 ("Office Action"), claim 1 stand rejected under 35 U.S.C. 103 based on U.S. Patent Application Publication No. 2007/0252441 to Yamauchi et al. ("Yamauchi") and newly cited U.S. Patent Application Publication No. 2019/0305600 to Nakao et al. ("Nakao"). Claim 2 stands rejected under 35 U.S.C. 103 based on Yamauchi, Nakao and U.S. Patent Publication No. 2012/0043826 to Saitoh ("Saitoh").
Response to Rejections under 35 U.S.C. § 103
Applicant respectfully traverses the rejection of claims 1 and 2 under35 U.S.C. § 103 because the Office Action cannot demonstrate that any combination of Yamauchi and Nakao teaches or suggests all the elements recited in the claims as amended.
Independent claim 1 is amended herein to recite, inter alia, "the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coif' (emphasis added).
Support for the recited elements may be found in U.S. Patent Application
Publication No. 2023/0187983 ("Specification"). For example, the specification
discloses:
[0030] As a result of the first capacitor 15, the second capacitor 16, and the first coil 17 being provided as described above, a delay in the phase of the current flowing through the transmission coil 14 relative to the phase of the voltage supplied to the transmission coil 14 is adjusted such that the switching loss of the switching elements of the inverter 13 is reduced. Moreover, the contactless power feeding apparatus 1 can perform a constant voltage output operation. Note that the settings of the electrostatic capaci- tances of the first capacitor 15 and the second capacitor 16 and the inductance of the first coil 17 will be described in detail later.
Specification, paragraph [0030]. The specification further discloses that:
s respectively represent an induc-
coil 14 and an inductance of the receiver coil 21, and a parameter Cs represents an electro- static capacitance of the resonance capacitor 22. Further- more, a parameter M is a mutual inductance between the transmission coil 14 and the receiver coil 21. Note that, when the degree of coupling between the transmission coil 14 and the receiver coil 21 is denoted as k, M=k(LI,Ls)".
Specification, paragraph [0054]; see also id. paragraphs [0055] et seq.
The specification further discloses advantages in that, in a contactless power
feeding apparatus in disclosed and recited embodiments, by including a first coil and a
first capacitor that are connected in series between the inverter of the power supply
circuit and one end of the transmission coil, and a second capacitor that is connected
at one end to a node between the first coil and the first capacitor, and is connected at
the other end to the other end of the transmission coil, and by setting the drive
frequency to be supplied to the transmission coil in a predetermined frequency range
including a resonance frequency of the resonant circuit of the power receiving
apparatus, the contactless power feeding apparatus can improve the power transmission efficiency while enabling a constant voltage output operation. See id. paragraph [0069].
The Office Action admits that Yamauchi fails to disclose a control circuit for controlling the driving circuit. See Office Action, pp. 7-8. To cure the admitted deficiency, the Office Action cites Nakao. See id. (citing controller 17 and FIG. 1 of Nakao). The Office Action further admits that Yamauchi and Nakao fail to disclose that values are set so the resonance frequency of the closed loop constituted by the transmission coil, the first capacitor, and the second capacitor is higher than the drive frequency. See id. p. 10. To cure the admitted deficiency the Office Action cites Saitoh. See id.
Applicants respectfully disagree with the characterization of Yamauchi, Nakao and Saitoh in the Office Action. Applicant contends that the characterization of what constitutes "constant voltage output operation" in the Office Action is pure conjecture since it is widely accepted by those of skill in the electrical arts that producing a constant output voltage remains a technical challenge in view of variations such as current fluctuations. Further, the Office Action has failed to demonstrate the Yamauchi discloses setting a drive frequency within an arbitrary range and asserts that the range doesn't matter. However, as admitted in the Office Aciton, Yamauchi fails to disclose controlling the frequency by admitting that Yamauchi fails to disclose the control circuit. Therefore, Applicant contends that Yamauchi fails to disclose that for which it is cited, regardless of the teachings of Naoko.
Nevertheless, independent claims 1 and 2 are amended to clarify the differences from the cited references. Therefore, regardless of whether Yamauchi, Nakao and Saitoh disclose that for which they are cited, it cannot be demonstrated that any combination of the cited references teaches or suggests "the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic
capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coil."
Yamauchi
As admitted in the Office Action, and as previously argued, Yamauchi fails to
disclose the recited control circuit. Thus, Yamauchi necessarily fails to disclose setting a driving frequency of the inverter within a range that includes a resonant frequency of a resonant circuit according to the claims.
Applicant additionally notes that Yamauchi solves the problem of large distortion on the primary side due to harmonics generated from a square wave excitation of the primary side by reducing a harmonic component unnecessarily radiated from a primary side coil. See Yamauchi, paragraph [0015]. Further, Yamauchi discloses that the resonance frequency of the capacitor C1 and the resonance frequency of the capacitor C2 are the same as the driving frequency of an inverter (power supply). See id., paragraph [0045]. Yamauchi further discloses that the inverter is a fixed-frequency inverter. See id. paragraph [0046]. Yamauchi further specifically discloses that a resonance of an L-shaped coil is lower than the driving frequency. See id. paragraph [0054].
Nowhere does Yamauchi disclose setting the driving frequency of the inverter. Therefore, not only does Yamauchi fail to disclose the recited frequency setting of the claimed invention, Yamauchi teaches against the claimed invention because controlling the frequency would change the principle of operation of these elements and of the arrangement as a whole and would rending the arrangement unsuitable for its intended purpose.
Nakao
Nakao discloses a power supply circuit 10 that supplies AC power having an adjustable switching frequency and an adjustable voltage to the transmission coil 14. For this purpose, the power supply circuit 10 includes a power source 11, a power factor improvement circuit 12, and four switching elements 13-1 to 13-4. Nakao, paragraph [0023]. Nakao further discloses a resonance circuit 20, that resonates with alternating current passed through the transmission coil 14. See id., paragraphs [0042] and [0043]. Naoko further discloses that constant voltage is achieved by changing the resonant
frequency of the resonance circuit 20. See id. Thus, it cannot be established that Nakao discloses that constant voltage is achieved by control of the switching frequency and voltage of the AC power applied to the transmission coil 14. Nakao discloses that the frequency and voltage are adjusted based on information received from a communicator 15. See id. paragraph [0065]. Nakao further discloses that the frequency and output voltage may be adjusted in view of degree of coupling k and equivalent resistance characteristics, even when the frequency is not the resonant frequency of the resonant circuit 20. See id. paragraphs [0068] and [0069]. Indeed, Nakao discloses that the switching frequency and voltage are properly adjusted when either the resistance value or the degree of coupling of the load circuit 26 changes. See id. paragraph [0072]. Lastly, it cannot be established that Nakao discloses controlling the drive frequency of the power supply circuit to fall within a range comprising a resonance frequency of the resonant circuit 20. It further cannot be established that Nakao discloses setting the drive frequency within the range to a frequency at which a constant voltage output operation is performed based on capacitance settings of the first capacitor and second capacitor, and an inductance of the first coil.
Yamauchi and Nakao Not Properly Combinable.
As previously argued on the record and which remains unanswered, Yamauchi fails to disclose and teaches against a control circuit that controls a power supply circuit to supply AC power having a drive frequency to a transmission coil, and control the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit. Further, as discussed above, it cannot be established that Nakao discloses a relation between the frequency setting of the power supply and a resonance of the resonant circuit 20.
Accordingly, the Office Action fails to explain how Yamauchi, which lacks the recited control circuit, could be modified with the teachings of Nakao to arrive at the claimed invention. Applicant respectfully submits that neither Yamauchi or Nakao contain sufficient teachings to guide one of skill in the art to arrive at the claimed invention. Therefore, the references are not properly combinable and a prima facie case of obviousness cannot be established.
Therefore, the Office Action has not demonstrated and the Office cannot
demonstrate any combination of Yamauchi, Nakao and Saitoh teaches or suggests at least "the control circuit is configured to control the drive frequency of the power supply circuit such that the drive frequency falls within a predetermined frequency range comprising a resonance frequency of the resonant circuit and the drive frequency is set within the predetermined frequency range to a frequency corresponding to a frequency at which a constant voltage output operation is performed based on settings of an electrostatic capacitance of the first capacitor, an electrostatic capacitance of the second capacitor, and an inductance of the first coif' as recited in amended independent claim 1.
For at least the reasons set forth above, amended independent claim 1 is patentable over any combination of Yamauchi, Nakao and Saitoh.
Claim 2 as amended depends directly or indirectly from amended independent claim 1 and is therefore patentable over any combination of Yamauchi, Nakao and Saitoh for at least the same reasons.
It is respectfully requested that the rejection of claims 1 and 2 under 35 U.S.C. § 103 based on Yamauchi, Nakao and Saitoh be reconsidered and withdrawn.
CONCLUSION


CITED REFERENCE SUMMARIES: Ref US20070252441A1: Claims:
A non-contact power transmission device comprising a primary side unit and a secondary side unit which house a primary side and a secondary side of a coupling transformer individually and can be separated from each other, wherein a capacitor which resonates with a primary side coil is connected to the primary side coil in series so that a primary side series resonance circuit is formed, an L-shaped resonance circuit having a coil and a capacitor resonating with the coil is inserted between the primary side series resonance circuit and a driving circuit, and the L-shaped resonance circuit is connected to the primary side series resonance circuit in series.
a capacitor which resonates with a primary side coil is connected to the primary side coil in series so that a primary side series resonance circuit is formed, an L-shaped resonance circuit having a coil and a capacitor resonating with the coil is inserted between the primary side series resonance circuit and a driving circuit, and the L-shaped resonance circuit is connected to the primary side series resonance circuit in series.
The non-contact power transmission device according to claim 1 , wherein a capacitor which resonates with a secondary side coil is connected to the secondary side coil so that a secondary side series resonance circuit is formed.
wherein a capacitor which resonates with a secondary side coil is connected to the secondary side coil so that a secondary side series resonance circuit is formed.
The non-contact power transmission device according to claim 1 , wherein the L-shaped resonance circuit composes a filter.
wherein the L-shaped resonance circuit composes a filter.
The non-contact power transmission device according to claim 3 , wherein a resonance frequency of the L-shaped resonance circuit is made to be lower than a driving frequency of the driving circuit by 5% to 25%.
wherein a resonance frequency of the L-shaped resonance circuit is made to be lower than a driving frequency of the driving circuit by 5% to 25%.
The non-contact power transmission device according to claim 1 , wherein a resonance frequency of the primary side series resonance circuit is adjusted to the driving frequency of the driving circuit.
wherein a resonance frequency of the primary side series resonance circuit is adjusted to the driving frequency of the driving circuit.
The non-contact power transmission device according to claim 2 , wherein a resonance frequency of the secondary side series resonance circuit is adjusted to the driving frequency of the driving circuit.
wherein a resonance frequency of the secondary side series resonance circuit is adjusted to the driving frequency of the driving circuit.
The non-contact power transmission device according to claim 1 , wherein in the primary side series resonance circuit, the other capacitors are connected to the primary side coil in parallel.
wherein in the primary side series resonance circuit, the other capacitors are connected to the primary side coil in parallel.
The non-contact power transmission device according to claim 1 , wherein the L-shaped resonance circuit composes an impedance matching circuit.
wherein the L-shaped resonance circuit composes an impedance matching circuit.
Ref US20190305600A1: Claims:
A non-contact feeding device comprising: a power transmission device; and a power receiving device to which power is transmitted from the power transmission device in a non-contact manner, wherein the power transmission device includes: a transmission coil configured to supply the power to the power receiving device, a power supply circuit configured to supply AC power to the transmission coil and to be capable of adjusting at least one of a switching frequency and voltage of the AC power supplied to the transmission coil, a first communicator configured to receive an output voltage abnormal signal from the power receiving device, and a control circuit configured to change at least one of the switching frequency and the voltage of the AC power supplied from the power supply circuit to the transmission coil when the first communicator receives the output voltage abnormal signal, wherein the power receiving device includes: a resonance circuit including a receiving coil receiving the power from the power transmission device and a resonance capacitor connected in series to the receiving coil, a rectifier circuit configured to rectify the power received through the resonance circuit, a resonance suppressing coil disposed so as to be capable of being electromagnetically coupled to the receiving coil, a switch circuit connected to the resonance suppressing coil to be capable of switching between short circuit and opening of the resonance suppressing coil, a voltage detection circuit configured to measure an output voltage of the power output from the rectifier circuit to obtain a measured value of the output voltage; a second communicator capable of communicating with the first communicator, and a determination circuit configured to cause the second communicator to transmit the output voltage abnormal signal while controlling the switch circuit so as to short-circuit the resonance suppressing coil when the measured value of the output voltage becomes greater than or equal to a predetermined upper-limit threshold.
a power transmission device; and
a power receiving device to which power is transmitted from the power transmission device in a non-contact manner,
wherein the power transmission device includes: a transmission coil configured to supply the power to the power receiving device, a power supply circuit configured to supply AC power to the transmission coil and to be capable of adjusting at least one of a switching frequency and voltage of the AC power supplied to the transmission coil, a first communicator configured to receive an output voltage abnormal signal from the power receiving device, and a control circuit configured to change at least one of the switching frequency and the voltage of the AC power supplied from the power supply circuit to the transmission coil when the first communicator receives the output voltage abnormal signal,
a transmission coil configured to supply the power to the power receiving device,
a power supply circuit configured to supply AC power to the transmission coil and to be capable of adjusting at least one of a switching frequency and voltage of the AC power supplied to the transmission coil,
a first communicator configured to receive an output voltage abnormal signal from the power receiving device, and
a control circuit configured to change at least one of the switching frequency and the voltage of the AC power supplied from the power supply circuit to the transmission coil when the first communicator receives the output voltage abnormal signal,
wherein the power receiving device includes: a resonance circuit including a receiving coil receiving the power from the power transmission device and a resonance capacitor connected in series to the receiving coil, a rectifier circuit configured to rectify the power received through the resonance circuit, a resonance suppressing coil disposed so as to be capable of being electromagnetically coupled to the receiving coil, a switch circuit connected to the resonance suppressing coil to be capable of switching between short circuit and opening of the resonance suppressing coil, a voltage detection circuit configured to measure an output voltage of the power output from the rectifier circuit to obtain a measured value of the output voltage; a second communicator capable of communicating with the first communicator, and a determination circuit configured to cause the second communicator to transmit the output voltage abnormal signal while controlling the switch circuit so as to short-circuit the resonance suppressing coil when the measured value of the output voltage becomes greater than or equal to a predetermined upper-limit threshold.
a resonance circuit including a receiving coil receiving the power from the power transmission device and a resonance capacitor connected in series to the receiving coil,
a rectifier circuit configured to rectify the power received through the resonance circuit,
a resonance suppressing coil disposed so as to be capable of being electromagnetically coupled to the receiving coil,
a switch circuit connected to the resonance suppressing coil to be capable of switching between short circuit and opening of the resonance suppressing coil,
a voltage detection circuit configured to measure an output voltage of the power output from the rectifier circuit to obtain a measured value of the output voltage;
a second communicator capable of communicating with the first communicator, and
a determination circuit configured to cause the second communicator to transmit the output voltage abnormal signal while controlling the switch circuit so as to short-circuit the resonance suppressing coil when the measured value of the output voltage becomes greater than or equal to a predetermined upper-limit threshold.
The non-contact feeding device according to claim 1 , wherein the determination circuit of the power receiving device controls the switch circuit so as to open the resonance suppressing coil when the control circuit of the power transmission device starts the change of at least one of the switching frequency and the voltage of the AC power.
The non-contact feeding device according to claim 1 , wherein, when the first communicator receives the output voltage abnormal signal, the control circuit of the power transmission device controls the switching frequency of the AC power supplied from the power supply circuit to the transmission coil such that the measured value of the output voltage does not change even when a resistance of a load circuit connected to the rectifier circuit of the power receiving device changes.
The non-contact feeding device according to claim 2 , wherein, when the first communicator receives the output voltage abnormal signal, the control circuit of the power transmission device controls the switching frequency of the AC power supplied from the power supply circuit to the transmission coil such that the measured value of the output voltage does not change even when a resistance of a load circuit connected to the rectifier circuit of the power receiving device changes.
Ref US20120043826A1: Claims:
A coil apparatus for a non-contact power transmission apparatus constituted by a power transmission coil apparatus to which AC power is input and a power receive coil apparatus which outputs AC power from the power transmission coil apparatus, wherein at least one of the power transmission coil apparatus and the power receive coil apparatus includes: a first winding section which constitutes a first resonance circuit together with a first capacitance element; a second winkling section which is magnetically coupled to the first winding section; and a third winding section which constitutes a second resonance circuit together with a second capacitance element, and which is magnetically coupled to the first winding section.
wherein at least one of the power transmission coil apparatus and the power receive coil apparatus includes:
a first winding section which constitutes a first resonance circuit together with a first capacitance element;
a second winkling section which is magnetically coupled to the first winding section; and
a third winding section which constitutes a second resonance circuit together with a second capacitance element, and which is magnetically coupled to the first winding section.
The coil apparatus according to claim 1 , wherein a winding region formed by the third winding section is larger than a winding region formed by the second winding section, and in a plan view in a plane intersecting with a winding axis of the second winding section or the third winding section, the winding region formed by the second winding section is formed on the inside of the winding region formed by the third winding section.
The coil apparatus according to claim 1 , wherein a winding region formed by the third winding section is larger than a winding region formed by the first winding section, and in a plan view in a plane intersecting with a winding axis of the first winding section or the third winding section, the winding region formed by the first winding section. is formed on the inside of the winding region formed by the third winding section.
The coil apparatus according to claim 1 , wherein a resonance frequency of the first resonance circuit is smaller than a resonance frequency of the second resonance circuit.
A non-contact power transmission apparatus, comprising the coil apparatus according to claim 1 .
Ref US20200412171A1: Claims:
A wireless power transmission device configured to transmit AC (Alternating Current) power to a wireless power receiving device including a power receiving coil by using an AC magnetic field, the wireless power transmission device comprising: a DC (Direct Current)/DC converter; an inverter configured to convert an output voltage of the DC/DC converter into an AC voltage having a driving frequency; a power transmission coil configured for the AC voltage to be supplied to from the inverter and configured to generate the AC magnetic field; a transmission-side resonance circuit including the power transmission coil; and a control circuit configured to increase a difference between a driving frequency of the inverter and a resonance frequency of the transmission-side resonance circuit when a predetermined condition is satisfied.
a DC (Direct Current)/DC converter;
an inverter configured to convert an output voltage of the DC/DC converter into an AC voltage having a driving frequency;
a power transmission coil configured for the AC voltage to be supplied to from the inverter and configured to generate the AC magnetic field;
a transmission-side resonance circuit including the power transmission coil; and
a control circuit configured to increase a difference between a driving frequency of the inverter and a resonance frequency of the transmission-side resonance circuit when a predetermined condition is satisfied.
A wireless power transmission device configured to transmit AC power to a wireless power receiving device including a power receiving-side resonance circuit including a power receiving coil by using an AC magnetic field, the wireless power transmission device comprising: a DC/DC converter; an inverter configured to convert an output voltage of the DC/DC converter into an AC voltage having a driving frequency; a power transmission coil configured for the AC voltage to be supplied to from the inverter and configured to generate the AC magnetic field; and a control circuit configured to increase a difference between a driving frequency of the inverter and a resonance frequency of the power receiving-side resonance circuit when a predetermined condition is satisfied.
a DC/DC converter;
a power transmission coil configured for the AC voltage to be supplied to from the inverter and configured to generate the AC magnetic field; and
a control circuit configured to increase a difference between a driving frequency of the inverter and a resonance frequency of the power receiving-side resonance circuit when a predetermined condition is satisfied.
The wireless power transmission device according to claim 1 , wherein the control circuit is configured to change any one value of an output power, an output voltage, and an output current of the wireless receiving device toward a predetermined value by increasing the difference between the driving frequency of the inverter and the resonance frequency of the transmission-side resonance circuit in a feedback control for changing the one value to be the predetermined value, when the predetermined condition is satisfied.
The wireless power transmission device according to claim 2 , wherein the control circuit is configured to change any one value of an output power, an output voltage, and an output current of the wireless receiving device toward a predetermined value by increasing the difference between the driving frequency of the inverter and the resonance frequency of the receiving-side resonance circuit in a feedback control for changing the one value to be the predetermined value, when the predetermined condition is satisfied.
A wireless power transmission device configured to transmit AC power to a wireless power receiving device including a power receiving coil by using an AC magnetic field, the wireless power transmission device comprising: a DC/DC converter; an inverter configured to convert an output voltage of the DC/DC converter into an AC voltage having a driving frequency; a power transmission coil configured for the AC voltage to be supplied to from the inverter and configured to generate the AC magnetic field; and a control circuit configured to perform intermittent operation control for intermittently operating the inverter when a predetermined condition is satisfied.
a control circuit configured to perform intermittent operation control for intermittently operating the inverter when a predetermined condition is satisfied.
The wireless power transmission device according to claim 1 , wherein the predetermined condition is that the output voltage of the DC/DC converter is equal to or less than a predetermined first set voltage.
The wireless power transmission device according to claim 2 , wherein the predetermined condition is that the output voltage of the DC/DC converter is equal to or less than a predetermined first set voltage.
The wireless power transmission device according to claim 5 , wherein the predetermined condition is that the output voltage of the DC/DC converter is equal to or less than a predetermined first set voltage.
The wireless power transmission device according to claim 6 , wherein the first set voltage is the lowest value among voltages that can be output by the DC/DC converter.
The wireless power transmission device according to claim 7 , wherein the first set voltage is the lowest value among voltages that can be output by the DC/DC converter.
The wireless power transmission device according to claim 8 , wherein the first set voltage is the lowest value among voltages that can be output by the DC/DC converter.
The wireless power transmission device according to claim 6 , wherein the first set voltage is a voltage higher than the lowest value among voltages that can be output by the DC/DC converter and is a set voltage.
The wireless power transmission device according to claim 7 , wherein the first set voltage is a voltage higher than the lowest value among voltages that can be output by the DC/DC converter and is a set voltage.
The wireless power transmission device according to claim 8 , wherein the first set voltage is a voltage higher than the lowest value among voltages that can be output by the DC/DC converter and is a set voltage.
The wireless power transmission device according to claim 1 , wherein the predetermined condition is that a relation between a load voltage of a load connected to the wireless power receiving device and a load current of the load matches a predetermined relation.
The wireless power transmission device according to claim 2 , wherein the predetermined condition is that a relation between a load voltage of a load connected to the wireless power receiving device and a load current of the load matches a predetermined relation.
The wireless power transmission device according to claim 5 , wherein the predetermined condition is that a relation between a load voltage of a load connected to the wireless power receiving device and a load current of the load matches a predetermined relation.
The wireless power transmission device according to claim 1 , wherein the control circuit configured to perform output voltage holding control f
[Truncated to input limit]