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US 9,979,316 B2Granted
Impedance compensation based on ratio of bus voltage and amplifier fundamental AC output voltage
AssigneeWiTricity Corporation
InventorConor Joseph Rochford
Life of this patent
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Abstract
Methods and apparatus provide compensation for impedance changes in a network energized by an amplifier, such as a class E amplifier. In embodiments, bus voltage amplifier fundamental AC output voltage can be used to generate a feedback signal for adjusting impedance of one or more components in the network. In embodiments, the amplifier fundamental AC output voltage is determined from current to the load, wherein the load is coupled to the amplifier by an LCL impedance matching network.
Claims27
A method comprising:
- compensating for impedance changes in a network to energize a load, wherein the network is coupled to an amplifier which has a fundamental AC output voltage that varies with the load impedance of the amplifier, by:
- determining a feedback signal from a ratio of a bus voltage and the amplifier fundamental AC output voltage, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier;
- and
- adjusting impedance of one or more components in the network based on the feedback signal.
1 more element
A system, comprising:
- a network configured for energizing a load;
- an amplifier coupled to the network;
- and
- a processor to compensate for impedance changes in the network based upon a feedback signal determined from a ratio of a bus voltage and a fundamental AC output voltage of the amplifier, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier.
1 more element
An article, comprising:
- a non-transitory computer readable medium containing stored instructions that enable a machine to:
- compensate for impedance changes in a network that includes a load, wherein the network is configured for coupling to an amplifier which has a fundamental AC output voltage that varies with the load impedance of the amplifier, by:
- determining a feedback signal from a ratio of a bus voltage and the amplifier fundamental AC output voltage, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier;
- and
- generating one or more signals to adjust impedance of one or more components in the network based on the feedback signal.
2 more elements
A method comprising:
- compensating for impedance changes in a network to energize a load, wherein the network is coupled to an amplifier which has a fundamental AC output voltage that varies with the load impedance of the amplifier, by:
- determining a feedback signal based on a bus voltage and the amplifier fundamental AC output voltage, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier;
- maintaining a given ratio of the bus voltage and amplifier fundamental AC output voltage within a range based on the feedback signal, wherein the range includes a minimum value and a maximum value;
- decreasing an impedance in the network when the feedback signal is less than the minimum value;
- and
- increasing an impedance in the network when the feedback signal is above the maximum value.
3 more elements
A system, comprising:
- a network configured for energizing a load;
- an amplifier coupled to the network;
- and
- a processor configured to:
- compensate for impedance changes in the network based upon a feedback signal determined based on a bus voltage and a fundamental AC output voltage of the amplifier, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier;
- maintain a given ratio of the bus voltage and the amplifier fundamental AC output voltage within a range based on the feedback signal, wherein the range includes a minimum value and a maximum value;
- decrease an impedance in the network when the feedback signal is less than the minimum value;
- and
- increase an impedance in the network when the feedback signal is above the maximum value.
6 more elements
An article, comprising:
- a non-transitory computer readable medium containing stored instructions that enable a machine to:
- compensate for impedance changes in a network that includes a load, wherein the network is configured for coupling to an amplifier which has a fundamental AC output voltage that varies with the load impedance of the amplifier, by:
- determining a feedback signal based on a bus voltage and the amplifier fundamental AC output voltage, wherein the bus voltage corresponds to a voltage driving the amplifier and the amplifier fundamental AC output voltage corresponds to a fundamental component of voltage input to a load of the amplifier;
- and
- maintaining a given ratio of the bus voltage and the amplifier fundamental AC output voltage within a range based on the feedback signal, wherein the range includes a minimum value and a maximum value;
- and
- generating one or more signals to decrease an impedance in the network when the feedback signal is less than the minimum value and increase an impedance in the network when the feedback signal is above the maximum value.
4 more elements
Dependencies are inferred from the claim text.