A 32 mV/69 mV input voltage booster based on a piezoelectric transformer for energy harvesting applications

作者：Camarda Antonio^*; Romani Aldo; Macrelli Enrico; Tartagni Marco

来源：Sensors and Actuators A: Physical , 2015, 232: 341-352.

DOI：10.1016/j.sna.2015.05.014

• Energy autonomous systems
• Energy harvesting
• JFET circuits
• Piezoelectric transformers
• Power management
• Step-up oscillators
• Ultra-low voltage

This paper presents a novel method for battery-less circuit start-up from ultra-low voltage energy harvesting sources. The approach proposes for the first time the use of a Piezoelectric Transformer (PT) as the key component of a step-up oscillator. The proposed oscillator circuit is first modelled from a theoretical point of view and then validated experimentally with a commercial PT. The minimum achieved start-up voltage is about 69 mV, with no need for any external magnetic component. Hence, the presented system is compatible with the typical output voltages of thermoelectric generators (TEGs). Oscillation is achieved through a positive feedback coupling the PT with an inverter stage made up of JFETs. All the used components are in perspective compatible with microelectronic and MEMS technologies. In addition, in case the use of a similar to 40 mu H inductor is acceptable, the minimum start-up voltage becomes as low as about 32 mV.

• 出版日期2015-8-1