| 摘要 |
<p>An electronic device 50 has at least one harvesting unit 52 for harvesting power from ambient energy. At least one circuit 54, including processing circuitry 56 configured to perform data processing, is supplied with power from the harvesting unit. Control circuitry 60 is provided to adjust at least one property of the processing circuitry or the at least one harvesting unit to reduce impedance mismatch between an output impedance of the harvesting unit and an input impedance of the at least one circuit. The impedance mismatch may be reduced by adjusting the frequency of a clock signal supplied to the processing circuitry in dependence upon an amount of power generated by the harvesting unit. The device may include plural harvesting units such as a photovoltaic cell, a thermoelectric generator a piezoelectric energy harvester and a radio frequency energy harvester.</p> |
