Receiver unit of a wireless power transfer system
A receiver unit of a wireless power transfer system is presented. The receiver unit includes a main receiver coil, a plurality of auxiliary receiver coils disposed about a central axis of the main receiver coil, and a receiver drive subunit. The receiver drive subunit includes a main converter operatively coupled to the main receiver coil and having a main output terminal. The receiver drive subunit may include a plurality of auxiliary converters operatively coupled to the plurality of auxiliary receiver coils. The plurality of auxiliary converters may be operatively coupled to each other to form an auxiliary output terminal coupled in series to the main output terminal to form a common output terminal. In some implementations, the receiver drive unit may be formed on a substrate of an integrated electronic component. The integrated electronic component may further include a communication subunit and a controller disposed.
1. A receiver unit of a wireless power transfer system, the receiver unit comprising:
a receiver drive unit comprising:
a first converter configured to generate a first voltage based on a wireless power signal and provide the first voltage at a first output terminal of the first converter,
one or more second converters configured to generate one or more second voltages based on the wireless power signal and provide the one or more second voltages at a second output terminal of the one or more second converters, and
a common output terminal formed by the first output terminal of the first converter and the second output terminal of the one or more second converters; and
a controller operatively coupled to the receiver drive unit and configured to:
determine one or more circuit parameters of the receiver drive unit, and
control at least one first switch of the first converter or at least one second switch of the one or more second converters based on the one or more circuit parameters.
2. The receiver unit of claim 1 , further comprising a plurality of receiver coils configured to receive the wireless power signal from a transmitter unit,
wherein the first converter is operatively coupled to a first receiver coil of the plurality of receiver coils, and
wherein the one or more second converters are operatively coupled to respective ones of one or more second receiver coils of the plurality of receiver coils.
3. The receiver unit of claim 2 , further comprising:
a communication unit configured to communicate with the transmitter unit, wherein the controller is further configured to control at least the communication unit based on the one or more circuit parameters.
4. The receiver unit of claim 3 , wherein the communication unit is coupled to at least one member selected from a group consisting of an alternating current terminal of the first converter, one or more alternating current terminals of the one or more second converters, and the common output terminal.
5. The receiver unit of claim 3 , wherein the controller configured to control at least the communication unit based on the one or more circuit parameters comprises the controller configured to vary at least one of a first impedance loading the first receiver coil or a second impedance loading the one or more second receiver coils.
6. The receiver unit of claim 2 , wherein the first receiver coil and the one or more second receiver coils are resonant coils.
7. The receiver unit of claim 2 , wherein the one or more second receiver coils are disposed around a central axis of the first receiver coil.
8. The receiver unit of claim 1 , wherein the one or more circuit parameters correspond to at least one of an alternating current terminal of the first converter, one or more alternating current terminals of the one or more second converters, or the common output terminal.
9. The receiver unit of claim 1 , wherein the controller configured to control the at least one first switch or the at least one second switch comprises the controller configured to control a pattern of switching of the at least one first switch or the at least one second switch based on the one or more circuit parameters.
10. The receiver unit of claim 1 , wherein the controller is further configured to control a third switch to prevent current flow through the one or more second converters.
11. The receiver unit of claim 1 , further comprising:
a current sensor configured to measure a current value associated with the common output terminal; and
a voltage sensor configured to measure a voltage value associated with the common output terminal,
wherein the controller is configured to determine the one or more circuit parameters based on either or both the current value and the voltage value.
12. The receiver unit of claim 1 , wherein the circuit parameters comprise one or more of voltage, current, frequency, or power.
13. The receiver unit of claim 1 , wherein the common output terminal is configured to provide a combination of the first voltage and the one or more second voltages to a load.
14. The receiver unit of claim 1 , wherein one of the one or more second converters is operatively coupled in parallel to another of the one or more second converters.
15. A wireless power transfer system comprising:
a transmitter unit including a transmitter coil; and
a receiver unit operatively coupled to the transmitter unit, wherein the receiver unit comprises:
a receiver drive unit comprising:
a first converter configured to generate a first voltage based on a wireless power signal and provide the first voltage at a first output terminal of the first converter,
one or more second converters configured to generate one or more second voltages based on the wireless power signal and provide the one or more second voltages at a second output terminal of the one or more second converters, and
a common output terminal formed by the first output terminal of the first converter and the second output terminal of the one or more second converters, and
a controller operatively coupled to the receiver drive unit and configured to:
determine one or more circuit parameters of the receiver drive unit, and
control at least one first switch of the first converter or at least one second switch of the one or more second converters based on the one or more circuit parameters.
16. The wireless power transfer system of claim 15 , wherein:
the receiver unit includes a plurality of receiver coils configured to receive the wireless power signal from the transmitter unit;
the first converter is operatively coupled to a first receiver coil of the plurality of receiver coils; and
the one or more second converters are operatively coupled to respective ones of one or more second receiver coils of the plurality of receiver coils.
17. The wireless power transfer system of claim 16 , wherein the one or more second receiver coils are disposed around a central axis of the first receiver coil.
18. The wireless power transfer system of claim 16 , wherein the one or more second receiver coils are configured to compensate for a misalignment between the transmitter coil and the first receiver coil.
19. The wireless power transfer system of claim 15 , wherein the receiving unit further comprises:
a communication unit configured to communicate with the transmitter unit, wherein the controller is further configured to control at least the communication unit based on the one or more circuit parameters.
20. The wireless power transfer system of claim 15 , wherein the common output terminal is configured to provide a combination of the first voltage and the one or more second voltages to a load.