Multi-mode resonant wireless power transmitter
AssigneeMediatek Inc.
InventorVladimir A. Muratov
Life of this patent
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Abstract
A wireless power transmitter includes a multi-mode drive circuit having a controllable resonant frequency. The multi-mode drive circuit is controlled to have a first resonant frequency to drive wireless power transmission at a first transmit frequency. The multi-mode drive circuit is also controlled to have a second resonant frequency higher than the first resonant frequency to drive wireless power transmission at a second transmit frequency higher than the first transmit frequency.
Claims24
A wireless power transmitter, comprising:
- a multi-mode drive circuit having a controllable resonant frequency, the multi-mode drive circuit being controlled to have a first resonant frequency to drive wireless power transmission at a first transmit frequency, and being controlled to have a second resonant frequency different from the first resonant frequency to drive wireless power transmission at a second transmit frequency different from the first transmit frequency;
- a first matching network coupled to an output of the multi-mode drive circuit, wherein the first matching network is configured to provide a first signal at the first transmit frequency to a first transmit coil;
- and
- a second matching network coupled to the output of the multi-mode drive circuit, wherein the second matching network is configured to provide a second signal at the second transmit frequency to a second transmit coil,
- wherein the wireless power transmitter is configured to detect a type of wireless power receiver that is present in the vicinity of the wireless power transmitter, and control the multi-mode drive circuit to have the first resonant frequency in response to detecting that the wireless power receiver is of a type that receives power wirelessly at the first transmit frequency, and
- wherein the first matching network is connected to the second matching network.
A wireless power transmission method for a wireless power transmitter comprising a multi-mode drive circuit having a controllable resonant frequency, the method comprising:
- (A) detecting, by the wireless power transmitter, a type of wireless power receiver that is present in the vicinity of the wireless power transmitter,
- (B) controlling the multi-mode drive circuit to have a first resonant frequency to drive wireless power transmission at a first transmit frequency in response to detecting that the wireless power receiver is of a type that receives power wirelessly at the first transmit frequency, wherein the wireless power transmission at the first transmit frequency is performed by providing a first signal from the multi-mode drive circuit to a first matching network that provides the first signal to a first transmit coil;
- and
- (C) controlling the multi-mode drive circuit to have a second resonant frequency to drive wireless power transmission at a second transmit frequency different from the first transmit frequency, wherein the wireless power transmission at the second transmit frequency is performed by providing a first signal from the multi-mode drive circuit to a second matching network that provides the second signal to a second transmit coil, and wherein the first matching network is connected to the second matching network.
Dependencies are inferred from the claim text.