Wireless power receiver
First Claim
Patent Images
1. A wireless power receiver structured to receive a power signal from a wireless power transmitter, the wireless power receiver comprising:
- a reception antenna having a reception coil structured to receive the power signal;
a rectification circuit having a first AC input terminal and a second AC input terminal coupled to both ends of the reception antenna, and structured to rectify an alternating current flowing through the reception antenna;
a smoothing capacitor structured to smooth an output of the rectification circuit;
a waveform stabilizer structured to be enabled in responsive to assertion of the control signal and to shift a parallel resonance frequency of the reception antenna so as to suppress waveform disturbance which occurs in voltages at the first AC input terminal and the second AC input terminal;
a current sensor structured to detect an output current of the wireless power receiver; and
a main controller structured to receive an output of the current sensor and to generate the control signal which is asserted when the output current is larger than a predetermined threshold,wherein the waveform stabilizer includesa first capacitor and a first switch which are provided in series between the first AC input terminal and a ground;
a second capacitor and a second switch which are provided in series between the second AC input terminal and the ground; and
a driver structured to turn on the first switch and the second switch for enabling the waveform stabilizer.
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Abstract
A reception antenna includes a reception coil which receives a power signal. A rectification circuit rectifies an alternating current flowing to the reception antenna. A smoothing capacitor smoothes an output of the rectification circuit. A waveform stabilizer is enabled when a power receiver satisfies a predetermined condition and shifts a parallel resonance frequency of the reception antenna.
10 Citations
14 Claims
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1. A wireless power receiver structured to receive a power signal from a wireless power transmitter, the wireless power receiver comprising:
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a reception antenna having a reception coil structured to receive the power signal; a rectification circuit having a first AC input terminal and a second AC input terminal coupled to both ends of the reception antenna, and structured to rectify an alternating current flowing through the reception antenna; a smoothing capacitor structured to smooth an output of the rectification circuit; a waveform stabilizer structured to be enabled in responsive to assertion of the control signal and to shift a parallel resonance frequency of the reception antenna so as to suppress waveform disturbance which occurs in voltages at the first AC input terminal and the second AC input terminal; a current sensor structured to detect an output current of the wireless power receiver; and a main controller structured to receive an output of the current sensor and to generate the control signal which is asserted when the output current is larger than a predetermined threshold, wherein the waveform stabilizer includes a first capacitor and a first switch which are provided in series between the first AC input terminal and a ground; a second capacitor and a second switch which are provided in series between the second AC input terminal and the ground; and a driver structured to turn on the first switch and the second switch for enabling the waveform stabilizer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 14)
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11. An electronic apparatus including a wireless power receiver structured to receive a power signal from a wireless power transmitter, the wireless power receiver comprising:
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a reception antenna having a reception coil structured to receive the power signal; a rectification circuit having a first AC input terminal and a second AC input terminal coupled to both ends of the reception antenna, and structured to rectify an alternating current flowing through the reception antenna; a smoothing capacitor structured to smooth an output of the rectification circuit; a waveform stabilizer structured to be enabled in responsive to assertion of the control signal and to shift a parallel resonance frequency of the reception antenna so as to suppress waveform disturbance which occurs in voltages at the first AC input terminal and the second AC input terminal; a current sensor structured to detect an output current of the wireless power receiver; and a main controller structured to receive an output of the current sensor and to generate the control signal which is asserted when the output current is larger than a predetermined threshold, wherein the waveform stabilizer includes a first capacitor and a first switch which are provided in series between the first AC input terminal and a ground; a second capacitor and a second switch which are provided in series between the second AC input terminal and the ground; and a driver structured to turn on the first switch and the second switch for enabling the waveform stabilizer.
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12. A power reception control circuit used in a wireless power receiver, the power reception control circuit comprising:
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a first alternating-current input terminal and a second alternating-current input terminal which are connected to a reception antenna receiving a power signal from a wireless power transmitter; a rectification circuit which includes having a first AC input terminal and a second AC input terminal coupled to both ends of the reception antenna and is connected to the first alternating-current input terminal and the second alternating-current input terminal and structured to rectify an alternating current flowing to the reception antenna; a rectification terminal to which a smoothing capacitor smoothing an output of the rectification circuit is connected; a waveform stabilizer structured to be enabled in responsive to assertion of the control signal and to shift a parallel resonance frequency of the reception antenna so as to suppress waveform disturbance which occurs in voltages at the first AC input terminal and the second AC input terminal; a current sensor structured to detect an output current of the wireless power receiver; and a main controller structured to receive an output of the current sensor and to generate the control signal which is asserted when the output current is larger than a predetermined threshold, wherein the waveform stabilizer includes; a first capacitor and a first switch which are provided in series between the first alternating-current input terminal and a ground; a second capacitor and a second switch which are provided in series between the second alternating-current input terminal and the ground; and a driver structured to turn on the first switch and the second switch for enabling the waveform stabilizer.
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13. A control method for a wireless power receiver receiving a power signal from a wireless power transmitter, the control method comprising:
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receiving the power signal by a reception antenna including a reception coil; rectifying, by a rectification circuit, an alternating current flowing to the reception antenna by a rectification circuit; smoothing an output of the rectification circuit; shifting, by a waveform stabilizer, a parallel resonance frequency of the reception antenna; detecting, by a current sensor, an output current of the wireless power receiver; and receiving an output of the current sensor and generating the control signal which is asserted, by a main controller, when the output current is larger than a predetermined threshold, wherein the rectification circuit has a first AC input terminal and a second AC input terminal coupled to both ends of the reception antenna, and the waveform stabilizer includes; a first capacitor and a first switch which are provided in series between the first AC input terminal and a ground; a second capacitor and a second switch which are provided in series between the second AC input terminal and the ground; and a driver structured to turn on the first switch and the second switch for enabling the waveform stabilizer in responsive to assertion of the control signal so as to suppress waveform disturbance which occurs in voltages at the first AC input terminal and the second AC input terminal.
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Specification