METHODS AND APPARATUSES FOR POWER CONTROL DURING BACKSCATTER MODULATION IN WIRELESS POWER RECEIVERS

摘要

A wireless power enabled apparatus including a wireless power receiver. The wireless power receiver includes a receive coil configured to generate an AC power signal responsive to a wireless power signal. A rectifier is configured to receive the AC power signal and generate a DC rectified power signal. A power transistor in a pass-transistor configuration is configured to receive the DC rectified power signal and generate an output power signal. A compensation current source operably coupled to the output power signal is configured to maintain a substantially constant voltage on the output power signal by adjusting a current through the compensation current source during a communication period employing backscatter modulation on the receive coil

主权项

1. A wireless power receiver, comprising:
a receive coil configured to generate an AC power signal responsive to a wireless power signal; a rectifier configured to receive the AC power signal and generate a DC rectified power signal; a power transistor operably coupled in a pass-transistor configuration between the DC rectified power signal and an output power signal, the power transistor configured to operate in a substantially constant current mode during a communication period employing backscatter modulation on the receive coil; a compensation current source configured to maintain a substantially constant voltage on the output power signal by adjusting a current through the compensation current source; and control logic configured to enable the compensation current source during the communication period.