Multi-Source Power Supply Having a Self-Impedance Matching Energy Harvester with Clamped Output Voltage

摘要

A multi-source power supply includes at least two power supply paths, both of which supply currents to a load. One of the power supply paths includes a voltage regulator configured to produce a first output voltage. The other power supply path constitutes an RF energy harvester which includes an RF antenna, a rectifier and a charge pump. The output voltage of the charge pump is clamped by the first output voltage from the voltage regulator of the first power path. Due to the clamped output voltage of the charge pump, the RF energy harvester undergoes self-impedance matching between the rectifier output and charge pump input.