Transmitter and receiver tuning in a wireless charging system
First Claim
1. A transmitter circuit suitable for use in wireless power transfer to a power receiving device, the transmitter circuit operable with an alternating current power source;
- the transmitter circuit comprising;
a transmitter coil;
Power transfer circuitry coupled between the power source and the transmitter coil, and including at least one tunable reactive component;
tuning heuristic circuitry configured to control power transfer from the power source to the power receiving device by tuning the at least one tunable reactive component based on a metric equal to;
|Vs|·
|Is|·
cos(φ
)·
(Vcoil_ref/Vcoil),where, |Vs| is the magnitude of the power source voltage, |Is| is the magnitude of the power source current, φ
is the phase difference between the power source voltage and power source current, Vcoil_ref is a normalization value, and Vcoil is the voltage across the transmitter coil.
1 Assignment
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Accused Products
Abstract
A wireless charging system includes a transmitter with tunable reactive components (such as capacitance or inductance). A metric related to power transfer from the transmitter through a coil is used to determine an amount to modify a Parameter. One metric is equal to |Vs|·|Is|·cos(φ)·(Vcoil_ref/Vcoil), where |Vs| is magnitude of the power source voltage, |Is| is magnitude of the power source current, φ is phase difference between the power source voltage and power source current, Vcoil_ref is a normalization value, and Vcoil is voltage across the coil. The transmitter can further include a phase tracking and adjustment loop (such as a phase-locked loop).
9 Citations
12 Claims
-
1. A transmitter circuit suitable for use in wireless power transfer to a power receiving device, the transmitter circuit operable with an alternating current power source;
- the transmitter circuit comprising;
a transmitter coil; Power transfer circuitry coupled between the power source and the transmitter coil, and including at least one tunable reactive component; tuning heuristic circuitry configured to control power transfer from the power source to the power receiving device by tuning the at least one tunable reactive component based on a metric equal to;
|Vs|·
|Is|·
cos(φ
)·
(Vcoil_ref/Vcoil),where, |Vs| is the magnitude of the power source voltage, |Is| is the magnitude of the power source current, φ
is the phase difference between the power source voltage and power source current, Vcoil_ref is a normalization value, and Vcoil is the voltage across the transmitter coil. - View Dependent Claims (2, 3, 4, 5, 6)
- the transmitter circuit comprising;
-
7. A method suitable for use in wireless power transfer from a transmitter including a transmitter coil, to a power receiving device, the transmitter operable with an alternating current power source, comprising:
-
controlling power transfer from the power source to the transmitter coil with power transfer circuitry that includes at least one tunable reactive component; tuning the at least one tunable reactive component based on a metric equal to;
|Vs|·
|Is|·
cos(φ
)·
(Vcoil_ref/Vcoil),where, |Vs| is the magnitude of the power source voltage, |Is| is the magnitude of the power source current, φ
is the phase difference between the Power source voltage and power source current, Vcoil_ref is a normalization value, and Vcoil is the voltage across the transmitter coil.- View Dependent Claims (8, 9, 10, 11, 12)
-
Specification