Power Amplifier for Wireless Power Transmission
First Claim
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1. A device, comprising:
- a power supply input configured to provide a power supply signal;
the first path configured to receive a clock signal and the power supply signal, the first path comprising;
a first output;
a first driver configured to accept the clock signal and modulate the power supply signal to generate, on the first output, a first oscillating power signal based on the clock signal;
the second path configured to receive the clock signal and the power supply signal, the second path comprising;
a second output;
a delay element configured to phase shift the clock signal by an angle to generate a shifted clock signal; and
a second driver configured to accept the shifted clock signal and modulate the power supply signal to generate, on the second output, a second oscillating power signal phase shifted by the angle with respect to the first oscillating power signal; and
a transmission circuit coupled to the first output and second output and configured to transmit a wireless power signal based on a combination of the first and second oscillating power signals.
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Abstract
A power signal source may provide current to a transmit coil to support wireless power transmission. The power signal source may include one or more modulators in parallel that may be phase delayed by an angle with respect to one another. The phase delay angle allows for adjustment of the magnitude of the current. The current provided to the transmit coil may be independent of the load of the transmit coil.
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Citations
20 Claims
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1. A device, comprising:
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a power supply input configured to provide a power supply signal; the first path configured to receive a clock signal and the power supply signal, the first path comprising; a first output; a first driver configured to accept the clock signal and modulate the power supply signal to generate, on the first output, a first oscillating power signal based on the clock signal; the second path configured to receive the clock signal and the power supply signal, the second path comprising; a second output; a delay element configured to phase shift the clock signal by an angle to generate a shifted clock signal; and a second driver configured to accept the shifted clock signal and modulate the power supply signal to generate, on the second output, a second oscillating power signal phase shifted by the angle with respect to the first oscillating power signal; and a transmission circuit coupled to the first output and second output and configured to transmit a wireless power signal based on a combination of the first and second oscillating power signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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providing a clock signal to a first path and a second path; phase delaying the clock signal on the second path by an angle with respect to the first path; based on the clock signal, modulating a power supply signal on the first path to generate a first oscillating power signal; based on the delayed clock signal, modulating the power supply signal on the second path to generate a second oscillating power signal; combining the first and second oscillating power signals to generate a wireless power signal with an amplitude dependent on the angle. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A device, comprising:
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a clock source configured to generate a clock signal characterized by a center frequency; a power source configured to generate a power signal; a first path coupled to the output of the clock source, the first path comprising; a first driver accepting the clock signal to generate a first driving signal; and a first pair of gates coupled to the output of the power signal, the first pair of gates accepting the first driving signal to modulate the power signal to generate a first oscillating power signal characterized by the center frequency; a second path coupled to the output of the clock source, the second path comprising; a delay accepting the clock signal, the delay comprising an effective propagation length so as to phase delay the clock signal by an angle to generate a delayed clock signal; a second driver coupled to the output of the delay so as to accept the delayed clock signal to generate a second driving signal; and a second pair of gates coupled to the output of the power signal, the second pair of gates accepting the second driving signal to modulate the power signal to generate a second oscillating power signal characterized by the center frequency and phased delayed by the angle with respect to the first oscillating power signal; a third path coupled to the output of the first and second paths so as to combine the first and second oscillating power signal to generate a wireless power signal characterized by the center frequency and with an amplitude dependent on the angle; and a transmission circuit accepting the wireless power signal so as to drive an antenna. - View Dependent Claims (20)
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Specification