Two new books on energy harvesting interfaces published

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Chip-integrated power management solutions are a must for ultra-low power systems. This enables not only the optimization of innovative sensor applications. It is also essential for integration and miniaturization of energy harvesting supply strategies of portable, wearable and autonomous monitoring systems. These two books deal with the challenge of extracting electrical energy out of ambient vibration energy which can be used to power small and low-power electronic devices, e.g., wireless sensor nodes. Particularly at low vibrations with small energy outputs, low-loss circuit designs are required to achieve high conversion efficiency. These books provide a comprehensive technology and application review and cover basics on transducer mechanics, fundamental circuit and control design, prototyping and testing.

CMOS Circuits for Piezoelectric Energy Harvesters

In the special case of piezoelectric energy harvesting, pulse charge extraction has the potential to extract more power compared to a simple rectifier. For this purpose, a fully autonomous CMOS integrated interface circuit for piezoelectric generators which fullfills these requirements is presented.

CMOS Circuits for Electromagnetic Vibration Transducers

For electromagnetic vibration transducers the chips achieve one of widest presented operational voltage range in standard CMOS technology: 0.44V to over 4.1V. The chips include novel interfacing concepts including maximum power point tracking methods for efficient tracking DC as well as AC sources down to sub-100µW ultra-low power levels.

A book on electromagnetic vibration energy harvesting devices labeled Electromagnetic Vibration Energy Harvesting Devices was published by this group in 2012.

Contact info: Dr. Dominic Maurath & Dr. Thorsten Hehn

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