Compact proof-of-concept platform for prototyping ambient micro-energy harvesting

Posted 15 September 2022

Trameto has introduced a proof-of-concept platform for evaluating how to generate a reliable micro-power source from ambient light and heat. Called Severn, the compact platform can be used as a prototype because its size and form factor could be adopted for production.

An engineering sample of the TM2040, a four-input, smart EH PMIC is at the heart of Severn. Up to four harvesters of the same or mixed type can be connected to any of its inputs without additional interface components. Each harvester typically generates microwatts to milliwatts of power.

The Severn platform includes a photovoltaic (PV) harvester on a hinged backing to allow optimal positioning and a thermoelectric generator (TEG) with an air heatsink, all housed in an acrylic case. Magnets facilitate the platform’s attachment to a warm, ferrous surface when working with the TEG. Daughter boards are supplied to allow for additional harvester inputs, deliver output power to the application, and communications. A Windows GUI is also available, which can display harvested power and status information.

The user locates the Severn where there is an artificial or natural light source for the PV panel and a warm surface relative to ambient air for stimulating the TEG.

The TM2040’s inputs adapt autonomously to the harvester type connected, and any changing ambient conditions, maximising energy capture. The PMIC then combines the energy from each input into a common store. On the Severn platform, this store is a super-capacitor. When the capacitor is fully charged, the TM2040 delivers a 1.8V DC, regulated supply at up to 15mA for powering wireless IoT sensors and modules.

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