Electrostatic vibration energy harvester with piezoelectric start-up generator

Florentino, Hélder R.; Freire, Raimundo C. S.; Alan, V. S.; Florentino, Caio; Galayko, D.

doi:10.1109/iscas.2011.5937820

Cited by 8 publications

(2 citation statements)

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“…Practical studies highlight that up to tens of volts may be needed for optimal operation [11]. However, the initial charge can only be obtained by a low-voltage battery existing in the system, or by a complementary piezoelectric KEH as proposed in [12]. In both cases, the initial voltage generated in this way will certainly be low (few volts).…”

Section: Shortcomings Of the Primitive Circuitmentioning

confidence: 99%

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Capacitive Energy Conversion With Circuits Implementing a Rectangular Charge-Voltage Cycle—Part 1: Analysis of the Electrical Domain

Galayko

Dudka

Karami

et al. 2015

IEEE Trans. Circuits Syst. I

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Capacitive kinetic energy harvesters (KEH) employ conditioning circuits which achieve a dynamic biasing of the transducer's variable capacitor. This paper, composed of two articles Part 1 and Part 2, proposes a unified theory describing electrical and electromechanical properties of an important and wide class of conditioning circuits: those implementing a rectangular chargevoltage cycle. The article Part 1 introduces a basic configuration of conditioning circuit implementing an ideal rectangular QV cycle, and discusses its known practical implementations: the Roundy charge pump with different flyback mechanisms, and configurations based on the Bennet's doubler. In Part 1, the analysis is done in the electrical domain, without accounting for electromechanical coupling, while in Part 2, the full electromechanical system is analyzed. An optimization approach common to all configurations is proposed. A comparison is made between different topologies and operation modes, based on the maximal energy converted in one cycle under similar electrical and mechanical conditions. The last section discusses practical implementation of circuits with smart and adaptive behavior, and presents experimental results obtained with state-of-the art MEMS capacitive KEH devices.

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Section: Shortcomings Of the Primitive Circuitmentioning

confidence: 99%

“…The simplest way to implement a flyback is to connect a load between and (Fig. 4), originally proposed in [12]. Here, the load is represented with a resistance whose current is: 24A simplified analysis may be done by analyzing independently the charge flows of the charge pump and of the resistor, and then by superimposing them.…”

Section: A Resistive Flybackmentioning

confidence: 99%