Amplificatori Switching (ad alto rendimento)

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Fast and Reliable Modeling of Piezoelectric Transducers for Energy Harvesting Applications

The paper presents a fast and reliable model identification technique for piezoelectric transducers based on an equivalent electromechanical circuit easily implementable on SPICE-like simulation tools. Model parameter extraction is simple and requires just standard and inexpensive laboratory equipment. Indeed, the equivalent circuit representation permits the evaluation of the response of a real energy harvesting system, where the electronic load is a synchronized switching converter which usually causes a significant feedback on the mechanical part of the system during energy extraction. Both simulation and measurements show that the damping effect is particularly important near resonance, where the adopted model is able to fit the experimental data and provides a more realistic description of the behavior of the system

Design of low-voltage integrated step-up oscillators with microtransformers for energy harvesting applications

This paper describes the modeling of startup circuits in battery-less micropower energy harvesting systems and investigates the use of bond wire micromagnetics. The analysis focuses on step-up Meissner oscillators based on magnetic core transformers operating with input voltages down to ≈100 mV, e.g. from thermoelectric generators. As a key point, this paper examines the effect of core losses and leakage inductances on the startup requirements obtained with the classical Barkhausen criterion, and demonstrates the minimum transconductance for oscillations to occur. For validation purposes, a step-up oscillator IC is fabricated in a STMicroelectronics 0.32 μm technology, and connected to two bond-wire microtransformers, respectively, with a 1:38 MnZn ferrite core and with a 1:52 ferromagnetic low-temperature co-fired ceramic (LTCC) core. Coherently with the proposed model, experimental measurements show a minimum startup voltage of 228 mV for the MnZn ferrite core and of 104 mV for the LTCC core

Datasheet di un dissipatore

Viene mostrato ad esempio di come tipicamente i costruttori illustrano i dati relativi al dissipator

Dispense relative alle prime 2 settimane: richiami e definizioni

Sono di ausilio per correggere e completare gli appunti presi a lezion

Tecnologie semiconduttori di potenza

provvisori

Circuito rivelatore di zero-crossing (per realizzare il sincronismo con la tensione di rete)

E' solo una delle possibili implementazioni; sarebbe istruttivo: 1) cercare di comprendere come ha ragionato il progettista per arrivare alla soluzione identificando la funzione di ogni singolo componente; 2) scrivere le equazioni per il dimensionamento dei componenti; 3) provare a generare un impulso ancora più breve e "scattoso" allo zero-crossing

Elenco dettagliato argomenti (definitivo)

Serve per riordinare gli appunti, per facilitarne la comprensione, per organizzare al meglio lo studio e per agevolare il processo di memorizzazione