Wireless power transmission system capable of continuing power transmission while suppressing heatup of foreign objects
First Claim
1. A control circuit of a wireless power transmitting apparatus in a wireless power transmission system for transmitting high-frequency power from the wireless power transmitting apparatus to a wireless power receiving apparatus,wherein the wireless power transmitting apparatus comprises a power transmitting antenna including a first resonant circuit including a power transmitting coil,wherein the wireless power receiving apparatus comprises a power receiving antenna including a second resonant circuit including a power receiving coil,wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency,wherein the control circuit of the wireless power transmitting apparatus sets a circuit constant of the wireless power transmitting apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band,wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band,wherein the control circuit of the wireless power transmitting apparatus repeatedly alternates a first time interval and a second time interval the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band,wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, andwherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil.
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0 Petitions
Accused Products
Abstract
A power transmitting antenna includes a first resonant circuit including a power transmitting coil. A power receiving antenna includes a second resonant circuit including a power receiving coil. When the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency. A wireless power transmitting apparatus is provided with a power transmitting circuit configured to generate high-frequency power at a variable frequency, and supply the high-frequency power to the power transmitting antenna. A control circuit sets the frequency of the high-frequency power generated by the power transmitting circuit to one of the odd-mode resonance frequency and the even-mode resonance frequency.
24 Citations
23 Claims
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1. A control circuit of a wireless power transmitting apparatus in a wireless power transmission system for transmitting high-frequency power from the wireless power transmitting apparatus to a wireless power receiving apparatus,
wherein the wireless power transmitting apparatus comprises a power transmitting antenna including a first resonant circuit including a power transmitting coil, wherein the wireless power receiving apparatus comprises a power receiving antenna including a second resonant circuit including a power receiving coil, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the control circuit of the wireless power transmitting apparatus sets a circuit constant of the wireless power transmitting apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band, wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power transmitting apparatus repeatedly alternates a first time interval and a second time interval the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band, wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, and wherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil.
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13. A wireless power transmitting apparatus in a wireless power transmission system for transmitting high-frequency power from the wireless power transmitting apparatus to a wireless power receiving apparatus, the wireless power transmitting apparatus comprising:
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a power transmitting circuit configured to generate high-frequency power from input power; a power transmitting antenna including a first resonant circuit including a power transmitting coil; and a control circuit of the wireless power transmitting apparatus, wherein the wireless power receiving apparatus comprises a power receiving antenna including a second resonant circuit including a power receiving coil, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the control circuit of the wireless power transmitting apparatus sets a circuit constant of the wireless power transmitting apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band, wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band, wherein, when the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other have the first operating band, the wireless power transmitting apparatus transmits power to the wireless power receiving apparatus at the odd-mode resonance frequency of the first operating band, and when the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other have the second operating band, the wireless power transmitting apparatus transmits power to the wireless power receiving apparatus at the even-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power transmitting apparatus repeatedly alternates a first time interval and a second time interval, the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band, wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, and wherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A control circuit of a wireless power receiving apparatus in a wireless power transmission system for transmitting high-frequency power from a wireless power transmitting apparatus to the wireless power receiving apparatus,
wherein the wireless power transmitting apparatus comprises a power transmitting antenna including a first resonant circuit including a power transmitting coil, wherein the wireless power receiving apparatus comprises a power receiving antenna including a second resonant circuit including a power receiving coil, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the control circuit of the wireless power receiving apparatus sets a circuit constant of the wireless power receiving apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band, wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power receiving apparatus repeatedly alternates a first time interval and a second time interval, the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band, wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, and wherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil.
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21. A wireless power receiving apparatus in a wireless power transmission system for transmitting high-frequency power from a wireless power transmitting apparatus to the wireless power receiving apparatus,
wherein the wireless power transmitting apparatus comprises a power transmitting antenna including a first resonant circuit including a power transmitting coil, wherein the wireless power receiving apparatus comprises: -
a power receiving antenna including a second resonant circuit including a power receiving coil; a power receiving circuit configured to supply output power to a load apparatus; and a control circuit of the wireless power receiving apparatus, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the control circuit of the wireless power receiving apparatus sets a circuit constant of the wireless power receiving apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band, wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power receiving apparatus repeatedly alternates a first time interval and a second time interval, the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band, wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, and wherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil. - View Dependent Claims (22)
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23. A wireless power transmission system comprising:
- a wireless power transmitting apparatus; and
a wireless power receiving apparatus,wherein the wireless power transmitting apparatus comprises; a power transmitting circuit configured to generate high-frequency power from input power; a power transmitting antenna including a first resonant circuit including a power transmitting coil; and a control circuit of the wireless power transmitting apparatus, wherein the wireless power receiving apparatus comprises; a power receiving antenna including a second resonant circuit including a power receiving coil, a power receiving circuit configured to supply output power to a load apparatus; and a control circuit of the wireless power receiving apparatus, wherein, when the power transmitting antenna and the power receiving antenna are electromagnetically coupled to each other, the power transmitting antenna and the power receiving antenna have an operating band including an odd-mode resonance frequency corresponding to an odd-mode resonant condition, and an even-mode resonance frequency corresponding to an even-mode resonant condition, and the even-mode resonance frequency is higher than the odd-mode resonance frequency, wherein the control circuit of the wireless power transmitting apparatus sets a circuit constant of the wireless power transmitting apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of a first operating band and a second operating band different from each other, and the first operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the first operating band, and the second operating band including an odd-mode resonance frequency and an even-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power receiving apparatus sets a circuit constant of the wireless power receiving apparatus associated with the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other, such that the operating band is set to one of the first operating band and the second operating band, wherein the even-mode resonance frequency of the first operating band is set to be higher than the even-mode resonance frequency of the second operating band, and the odd-mode resonance frequency of the first operating band is set to be higher than the odd-mode resonance frequency of the second operating band, wherein, when the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other have the first operating band, the wireless power transmitting apparatus transmits power to the wireless power receiving apparatus at the odd-mode resonance frequency of the first operating band, and when the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other have the second operating band, the wireless power transmitting apparatus transmits power to the wireless power receiving apparatus at the even-mode resonance frequency of the second operating band, wherein the control circuit of the wireless power transmitting apparatus repeatedly alternates a first time interval and a second time interval, the first time interval has a first continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the first operating band, and the second time interval has a second continuous operating time during which the operating band of the power transmitting antenna and the power receiving antenna electromagnetically coupled to each other is set to the second operating band, wherein the first continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches a threshold temperature, when high-frequency power is transmitted at the odd-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil, and wherein the second continuous operating time is set to be shorter than a shortest period of time during which a temperature of a foreign object reaches the threshold temperature, when high-frequency power is transmitted at the even-mode resonance frequency and the foreign object is present near the power transmitting coil or the power receiving coil.
- a wireless power transmitting apparatus; and
Specification