Abstract
This paper presents an integrated and self-starting power management unit (PMU) for piezoelectric energy harvesters. The system utilizes an undervoltage lockout (UVLO) circuit with an active voltage doubler, Dickson charge pump, and low dropout regulator. The UVLO circuit allows intermittent charging of storage capacitors to their target voltages during an undervoltage condition, resulting in improved self-startup capabilities and reduced power dissipation at startup. Implemented using AMS 0.35-µm CMOS process, the system is able to achieve a regulated 3.3 V DC voltage with 228 ms startup time using a 1 V AC voltage input with a frequency of 102 Hz.
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