MIT Chip A Triple-Threat Power Harvester | @Earthtechling

…The MIT approach combines energy from multiple sources by switching rapidly between them. It doesn’t quite sound simultaneous, but Bandyopadhyay did say of the system, “we extract power from all the sources.”

The conquered another challenge, according to the university: driving down how much power the control circuit itself consumes.

The researchers made the system more efficient by using what the university called “an innovative dual-path architechture.” This means the system is able to build a up a charge in an energy-storage device (a battery or supercapacitor), which is customary – or it can bypass energy storage and directly power the device.

According to the abstract for the paper that describes the MIT research, published in the IEEE Journal of Solid-State Circuits, this dual-path architecture “has a peak efficiency improvement of 11%–13% over the traditional two-stage approach.”

The abstract also reports: “A proposed time-based power monitor is used for achieving maximum power point tracking for the photovoltaic harvester. This has a peak tracking efficiency of 96%. The peak efficiencies achieved with inductor sharing are 83%, 58%, and 79% for photovoltaic boost, thermoelectric boost, and piezoelectric buck-boost converters, respectively.”…

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