Wireless power transfer frequency adjustment
First Claim
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1. A wireless power transfer system, comprising:
- a power transmitting apparatus configured to wirelessly transmit power;
a power receiving apparatus connected to an electrical load and configured to receive power from the power transmitting apparatus;
a detector comprising;
a first input terminal configured to receive a first electrical signal comprising information about an output voltage waveform of a power source of the power transmitting apparatus;
a second input terminal configured to receive a second electrical signal comprising information about an output current waveform of the power source of the power transmitting apparatus;
a first logic unit connected to the first and second input terminals and configured to produce a first output waveform based on the first and second electrical signals; and
a second logic unit connected to the first logic unit and configured to produce a second output waveform based on the first output waveform, wherein the second output waveform comprises a pulse having a width that corresponds to a phase difference between the output voltage and current waveforms; and
a controller connected to the power transmitting apparatus and to the detector, and configured to;
receive the second output waveform; and
adjust a frequency of the transmitted power based on the phase difference.
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Abstract
The disclosure features wireless power transfer systems that include a power transmitting apparatus configured to wirelessly transmit power, a power receiving apparatus connected to an electrical load and configured to receive power from the power transmitting apparatus, and a controller connected to the power transmitting apparatus and configured to receive information about a phase difference between output voltage and current waveforms in a power source of the power transmitting apparatus, and to adjust a frequency of the transmitted power based on the measured phase difference.
700 Citations
20 Claims
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1. A wireless power transfer system, comprising:
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a power transmitting apparatus configured to wirelessly transmit power; a power receiving apparatus connected to an electrical load and configured to receive power from the power transmitting apparatus; a detector comprising; a first input terminal configured to receive a first electrical signal comprising information about an output voltage waveform of a power source of the power transmitting apparatus; a second input terminal configured to receive a second electrical signal comprising information about an output current waveform of the power source of the power transmitting apparatus; a first logic unit connected to the first and second input terminals and configured to produce a first output waveform based on the first and second electrical signals; and a second logic unit connected to the first logic unit and configured to produce a second output waveform based on the first output waveform, wherein the second output waveform comprises a pulse having a width that corresponds to a phase difference between the output voltage and current waveforms; and a controller connected to the power transmitting apparatus and to the detector, and configured to; receive the second output waveform; and adjust a frequency of the transmitted power based on the phase difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for wireless power transfer, comprising:
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using a power transmitting apparatus to wirelessly transfer power at a selected frequency to a power receiving apparatus connected to an electrical load to deliver power to the load; receiving a first electrical signal comprising information about an output voltage waveform of a power source of the power transmitting apparatus, and a second electrical signal comprising information about an output current waveform of the power source of the power transmitting apparatus; performing a first logical operation on the first and second electrical signals to generate a first output waveform; performing a second logical operation on the first output waveform and the first electrical signal to generate a second output waveform, wherein the second output waveform comprises a pulse having a width that corresponds to a phase difference between the output voltage and current waveforms; and adjusting the frequency based on the phase difference. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification