Wireless power system and resonant frequency changing method thereof
First Claim
1. A wireless power receiver comprising:
- a power receiving unit having a receiving side resonant circuit provided with at least one inductor and at least one capacitor, and configured to receive a wireless power signal, the wireless power signal being generated based on a resonance phenomenon between the receiving side resonant circuit and a transmitting side resonant circuit of a wireless power transmitter; and
a power reception control unit configured to control the power receiving unit to change a connection between the at least one inductor and the at least one capacitor so as to change a resonant frequency corresponding to the wireless power signal, wherein the power receiving unit comprises;
a first capacitor;
a second capacitor;
an inductor; and
a switching device,wherein the power receiving unit is configured to selectively connect either the first capacitor or the second capacitor to the inductor in response to a switching operation of the switching device so as to change the resonant frequency corresponding to the wireless power signal,wherein the first capacitor is a detection capacitor configured to connect to the inductor to have the power receiving unit to operate in a first resonant frequency when the wireless power receiver meets a specific condition,wherein the first resonant frequency is preconfigured to generate a resonant coupling between the receiving side resonant circuit and the transmitting side resonant circuit strong enough to wake up and drive the power reception control unit and prevent the wireless power signal from damaging the wireless power receiver, andwherein the second capacitor is a resonance capacitor configured to connect to the inductor to wirelessly receive power and charge the wireless power receiver in a second resonant frequency from the wireless power transmitter based on the resonance phenomenon when a receiving side voltage of the wireless power receiver is close to a reference voltage within a specific error range after meeting the specific condition.
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Accused Products
Abstract
This specification provides a wireless power system capable of changing a resonant frequency and a resonant frequency changing method thereof. To this end, a wireless power receiver according to one exemplary embodiment includes a power receiving unit having a receiving side resonant circuit provided with at least one inductor and at least one capacitor, and configured to receive a wireless power signal, the wireless power signal being generated based on a resonance phenomenon between the receiving side resonant circuit and a transmitting side resonant circuit of a wireless power transmitter, and a power reception control unit configured to control the power receiving unit to change a connection between the at least one inductor and the at least one capacitor so as to change a resonant frequency corresponding to the wireless power signal.
14 Citations
16 Claims
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1. A wireless power receiver comprising:
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a power receiving unit having a receiving side resonant circuit provided with at least one inductor and at least one capacitor, and configured to receive a wireless power signal, the wireless power signal being generated based on a resonance phenomenon between the receiving side resonant circuit and a transmitting side resonant circuit of a wireless power transmitter; and a power reception control unit configured to control the power receiving unit to change a connection between the at least one inductor and the at least one capacitor so as to change a resonant frequency corresponding to the wireless power signal, wherein the power receiving unit comprises; a first capacitor; a second capacitor; an inductor; and a switching device, wherein the power receiving unit is configured to selectively connect either the first capacitor or the second capacitor to the inductor in response to a switching operation of the switching device so as to change the resonant frequency corresponding to the wireless power signal, wherein the first capacitor is a detection capacitor configured to connect to the inductor to have the power receiving unit to operate in a first resonant frequency when the wireless power receiver meets a specific condition, wherein the first resonant frequency is preconfigured to generate a resonant coupling between the receiving side resonant circuit and the transmitting side resonant circuit strong enough to wake up and drive the power reception control unit and prevent the wireless power signal from damaging the wireless power receiver, and wherein the second capacitor is a resonance capacitor configured to connect to the inductor to wirelessly receive power and charge the wireless power receiver in a second resonant frequency from the wireless power transmitter based on the resonance phenomenon when a receiving side voltage of the wireless power receiver is close to a reference voltage within a specific error range after meeting the specific condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A wireless power transmitter comprising:
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a power conversion unit having a transmitting side resonant circuit provided with at least one inductor and at least one capacitor, and configured to generate a wireless power signal based on a resonance phenomenon between the transmitting side resonant circuit and a receiving side resonant circuit of a wireless power receiver; and a power transmission control unit configured to change a connection between the at least one inductor and the at least one capacitor so as to change a resonant frequency corresponding to the wireless power signal, wherein the wireless power receiver comprises; a first capacitor; a second capacitor; an inductor; and a switching device, wherein the inductor is selectively connected to either the first capacitor or the second capacitor in response to a switching operation of the switching device so as to change the resonant frequency corresponding to the wireless power signal, wherein the first capacitor is a detection capacitor configured to connect to the inductor to have the wireless power receiver to operate in a first resonant frequency when the wireless power receiver meets a specific condition, wherein the first resonant frequency is preconfigured to generate a resonant coupling between the receiving side resonant circuit and the transmitting side resonant circuit strong enough to wake up and drive the power reception control unit and prevent the wireless power signal from damaging the wireless power receiver, and wherein the second capacitor is a resonance capacitor configured to connect to the inductor to wirelessly receive power and charge the wireless power receiver in a second resonant frequency from the wireless power transmitter based on the resonance phenomenon when a receiving side voltage of the wireless power receiver is close to a reference voltage within a specific error range after meeting the specific condition. - View Dependent Claims (13, 14)
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15. A method for changing a resonant frequency in a wireless power receiver having a receiving side resonant circuit provided with at least one inductor and at least one capacitor, the method comprising:
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receiving a wireless power signal generated based on a resonance phenomenon between the receiving side resonant circuit and a transmitting side resonant circuit of a wireless power transmitter; and changing a connection between the at least one inductor and the at least one capacitor to change a resonant frequency corresponding to the wireless power signal, wherein the receiving side resonant circuit comprises; a first capacitor; a second capacitor; an inductor; and a switching device, wherein the inductor is selectively connected to either the first capacitor or the second capacitor in response to a switching operating of the switching device so as to change the resonant frequency corresponding to the wireless power signal, wherein the first capacitor is a detection capacitor configured to connect to the inductor to have the wireless power receiver to operate in a first resonant frequency when the wireless power receiver meets a specific condition, wherein the first resonant frequency is preconfigured to generate a resonant coupling between the receiving side resonant circuit and the transmitting side resonant circuit strong enough to wake up and drive the power reception control unit and prevent the wireless power signal from damaging the wireless power receiver, and wherein the second capacitor is a resonance capacitor configured to connect to the inductor to wirelessly receive power and charge the wireless power receiver in a second resonant frequency from the wireless power transmitter based on the resonance phenomenon when a receiving side voltage of the wireless power receiver is close to a reference voltage within a specific error range after meeting the specific condition. - View Dependent Claims (16)
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Specification