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How can you make batteries last forever in a wireless sensing system?

By Randy Frank | June 29, 2017

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At Sensors Expo 2017, Geoffroy Gosset, CEO and founder of e-peas, explains how a variety of energy harvesting techniques and low power solutions that his company supplies can answer this question.

Using the company’s power management ICs (PMICs), systems can be designed that run ARM processors continuously at low frequencies and draw less power than when microcontroller units (MCUs) operate at higher frequencies and turn on from sleep modes.

For photovoltaic cells it’s the AEM10940 and AEM10941.

For thermoelectric EH applications, it’s the AEM20940.

For piezoelectric and RF EH applications, it’s the AEM30940.

The ICs use a patented cold start technique to achieve 3 µW, 50 mV coldstart in photovoltaic applications, 15 µW, 50 mV coldstart in the thermoelectric system, 3 µW, 380 mV cold start in the piezoelectric system and -18.8 dB coldstart in the RF application. The leakage current in these designs is less than 400 nA. The PMICS can harvest energy efficiently (up to 90% efficiently) at power levels up to 500 mW. The ICs provide the ability to switch to a primary battery or ultracapacitor in the system to guarantee that it works 24/7.

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