Electro-mechanical and electronic integrated harvester for shoes application
| Autor: | Alessandro Gasparini, Nicolo' Manca, Maurizio Repetto, Elvio Bonisoli |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0209 industrial biotechnology
Engineering Electro-mechanical harvesting 02 engineering and technology law.invention Energy harvesting Electro-mechanical harvesting Active circuits Harvester interface 020901 industrial engineering & automation law 0202 electrical engineering electronic engineering information engineering Electronic engineering Electronics Electrical and Electronic Engineering Energy recovery business.industry Energy harvesting 020208 electrical & electronic engineering Electrical engineering Computer Science Applications Power (physics) Harvester interface Capacitor Transducer Control and Systems Engineering Active circuits Resistor business Energy (signal processing) |
| Popis: | Energy harvesting allows making sensors or transmitters electrically autonomous. Several studies have been proposed but most cases lack electrical and mechanical parts integration and practical application purpose. Here, with the aim of supplying a Bluetooth step-counter placed in the sole of a training shoe, a complete system is presented. It consists of a magnetoinductive transducer embedded with an electronic interface for power conditioning and exploits only the energy recovered by the impact on the ground. A $\phi$ 27 $\times$ 16 mm cylindrical device containing the transducer, the electronic interface, the step-counter electronics, and the protective shell is developed. Energy recovery derives from the magnet-free oscillation following the shoe impact. The proposed interface exploits pulse-width modulation to perform transducer output rectification and to emulate optimal load impedance while charging a storage capacitor. Numerical and experimental analysis show effective optimal resistive load emulation and energy recovery gain of 2 compared with the standard ac–dc interface. Prototypes have been manufactured and tested. Considering a sample footstep, energy recovery is 360 μJ against 400 μJ dissipated on optimal resistor. Mean energy recovery over a complete run is 644 μJ/footstep. In spite of variable excitation, energy recovery at each footstep is larger than the required and allows the step-counter transmitting the information. |
| Databáze: | OpenAIRE |
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