Patent ID: 8461817

Claim:
An apparatus, comprising: a first converter module configured to convert a wireless power associated with an electromagnetic wave to a first DC voltage; a sensor module configured to monitor the first DC voltage, the sensor module configured to produce an output associated with the first DC voltage, the sensor module configured to maintain the first DC voltage between a first threshold voltage and a second threshold voltage; and a second converter module configured to convert the first DC voltage to a second DC voltage larger than the first DC voltage, the second converter module configured to be enabled by the output from the sensor module when the first DC voltage is above the first threshold voltage, the second converter module configured to be disabled by the output from the sensor module when the first DC voltage is below the second threshold voltage lower than the first threshold voltage, the second converter module configured to provide power to a load device based on the second DC voltage; an antenna configured to receive the electromagnetic wave; and an impedance matching module configured to substantially match an impedance of the first converter module and an impedance of the antenna over a frequency range including a center frequency associated with the electromagnetic wave, when the first DC voltage is maintained between the first threshold voltage and the second threshold voltage.