Wideband Energy Harvesting by Multiple Piezoelectric Oscillators With an SECE Interface

2015 ◽  
Author(s):  
P. H. Wu ◽  
Y. C. Shu
Keyword(s):  
Energy Harvesting ◽  
Electric Response ◽  
Impedance Matrix ◽  
Matrix Formulation ◽  
Parallel Connection ◽  
Interface Circuits ◽  
Load Impedance ◽  
Interface Circuit ◽  
The Matrix ◽  
Equivalent Load

This paper presents the development of wideband energy harvesting by the parallel connection of multiple piezoelectric oscillators attached to a synchronized electric charge extraction (SECE) interface circuit. It is shown that the electric response is determined by the matrix formulation of generalized Ohm’s law. The impedance matrix is explicitly expressed in terms of the equivalent load impedance and system parameters. In addition, the load impedance is found to be independent of external load, so is harvested power. The framework is subsequently validated numerically by SPICE circuit simulations. Finally, the performance evaluation is carried out with comparisons to other interface circuits, including the standard and synchronized switch harvesting on inductor (SSHI) interfaces. The result demonstrates that the bandwidth of an SECE array system is improved and its harvested power is not less than that based on the use of other interface circuits.

Mixed Parallel-Series Connection of Piezoelectric Oscillators for Wideband Energy Harvesting

2016 ◽  
Author(s):  
P. H. Wu ◽  
Y. J. Chen ◽  
B. Y. Li ◽  
Y. C. Shu
Keyword(s):  
Energy Harvesting ◽  
Peak Power ◽  
Matrix Formulation ◽  
Load Impedance ◽  
Series Connection ◽  
Array Configuration ◽  
Standard Interface ◽  
Generalized Matrix ◽  
Equivalent Load ◽  
Parallel Series

The article studies the behavior of a mixed parallel-series connection of piezoelectric oscillators attached to the standard interface for wideband energy harvesting. The estimate of power output is obtained analytically considering the formulations of balance of charge, energy and system dynamics. It can be presented based on the generalized matrix formulation of charging on capacitance in terms of equivalent load impedance. The proposed model is subsequently validated numerically through circuit simulations. Finally, a design with a careful choice of parallel-series mixed connection of oscillators is proposed for illustration. With a proper circuit layout triggering the switching of connection, the result shows that the peak power of each array configuration is roughly uniform within the frequency range of interest. Hence, the bandwidth is enlarged without the loss of peak power.

Series Connection of Multiple Piezoelectric Oscillators

2012 ◽  
Author(s):  
H. C. Lin ◽  
P. H. Wu ◽  
I. C. Lien ◽  
Y. C. Shu
Keyword(s):  
Energy Harvesting ◽  
Power Output ◽  
Electrical Response ◽  
Matrix Formulation ◽  
Parallel Connection ◽  
Series Connection ◽  
Energy Harvesters ◽  
Piezoelectric Energy ◽  
The Matrix ◽  
In Series

This article investigates the electrical response of piezoelectric energy harvesters (PEHs) connected in series. Analytic estimates of harvested power output are proposed for a series PEH array system attached to various energy harvesting circuits, including standard and parallel-/series-SSHI (synchronized switch harvesting on inductor) interfaces. In contrast to the case of parallel connection of multiple oscillators, the results are presented through the matrix formulation of charging on capacitance. Besides, they are validated numerically by standard circuit simulations.

Design of Rectified Piezoelectric Power Generators by Finite Element Methods

2014 ◽  
Author(s):  
P. H. Wu ◽  
Y. C. Shu
Keyword(s):  
Finite Element ◽  
Interface Circuits ◽  
Load Impedance ◽  
Power Generators ◽  
Proposed Model ◽  
In Series ◽  
Element Approach ◽  
Common Interface ◽  
Structural Configurations ◽  
Equivalent Load

The article proposes designing rectified piezoelectric power generators based on the direct finite element method. It accounts for the consideration of common interface circuits such as the standard and parallel-/series-SSHI (synchronized switch harvesting on inductor) circuits, and complicated structural configurations such as arrays of piezoelectric oscillators. The proposed model suggests replacing the energy harvesting circuit by an equivalent load impedance in series with negative piezoelectric capacitance. As the expression of the equivalent load impedance can be explicitly derived, the proposed finite element approach is capable of handling common interface circuits without resorting to circuit solvers. Finally, the model is extended to the consideration of SECE (synchronized electric charge extraction) circuit which offers an advantage of independence of harvested power on external loads.

Synchronized bias-flip interface circuits for piezoelectric energy harvesting enhancement: A general model and prospects

2016 ◽  
Vol 28 (3) ◽  
pp. 339-356 ◽  
Author(s):  
Junrui Liang
Keyword(s):  
Energy Harvesting ◽  
Coupled System ◽  
Piezoelectric Energy Harvesting ◽  
Interface Circuits ◽  
Energy Investment ◽  
Interface Circuit ◽  
Piezoelectric Energy ◽  
Bridge Rectifier ◽  
Piezoelectric Structure ◽  
Optimal Bias

Piezoelectric energy harvesting (PEH) systems, as a kind of electromechanically coupled system, are composed of two essential parts: the piezoelectric structure and the power conditioning interface circuit. Previous studies have shown that the energy harvesting capability of a piezoelectric generator can be greatly enhanced by up to several hundred percent by using synchronized switch harvesting on inductor (SSHI) interface circuits, the most extensively investigated family of synchronized bias-flip interface circuits. After SSHI, some other bias-flip circuit topologies, which utilize active approaches for PEH enhancement, have been proposed sporadically. Yet, how active is active enough for harvesting as much energy as possible was not clear. This paper answers this question through the generalization and derivation of existing bias-flip solutions. The study starts by analyzing the energy flow in existing featured interface circuits, including the standard energy harvesting (bridge rectifier) circuit, parallel-SSHI, series-SSHI, pre-biasing/energy injection/energy investment scheme, etc. A synchronized multiple bias-flip (SMBF) model, which generalizes the bias-flip control and summarizes the energy details in these circuits, is then proposed. Based on the topological and mathematical abstraction, the optimal bias-flip (OBF) strategy towards maximum harvesting capability is derived. A case study on the series synchronized double bias-flip (S-S2BF) circuit shows that the potential of the PEH interface circuits can be fully released by using the OBF strategy. The proposed SMBF model and OBF strategy set the theoretical foundation and provide a new insight for future circuit innovations towards more powerful PEH systems.

Piezoelectric Vibration Energy Harvester: Design and Prototype

2012 ◽  
Author(s):  
Bogdan Cojocariu ◽  
Anthony Hill ◽  
Alejandra Escudero ◽  
Han Xiao ◽  
Xu Wang
Keyword(s):  
Energy Harvesting ◽  
Vibration Energy ◽  
Vibration Energy Harvesting ◽  
Interface Circuits ◽  
Vibration Energy Harvester ◽  
New Approach ◽  
Interface Circuit ◽  
Standard Interface ◽  
Energy Harvesting System ◽  
Piezoelectric Vibration

This paper proposes a new approach for vibration energy harvesting analysis. The research investigates and compares efficiencies of a vibration energy harvesting system with two different electric storage interface circuits. One of the interface circuits is the standard interface circuit comprised of four rectifier diodes connected in a classical single phase bridge. The other interface circuit is a newly proposed interface circuit integrated with a voltage multiplier, an impedance converter and an off shelf booster. To validate the effectiveness of the newly proposed interface circuit, a vibration energy harvesting beam system has been developed in connection with this proposed circuit. The harvested efficiency and harvested power output of the system with the two different electric storage interface circuits have been measured and compared.

The Convex Polytopes and Homogeneous Coordinate Rings of Bivariate Polynomials

2019 ◽  
Vol 16 (2) ◽  
pp. 1
Author(s):  
Shamsatun Nahar Ahmad ◽  
Nor’Aini Aris ◽  
Azlina Jumadi
Keyword(s):  
Convex Polytopes ◽  
Polynomial Systems ◽  
Matrix Formulation ◽  
Bivariate Polynomials ◽  
Homogeneous Coordinates ◽  
The Matrix ◽  
Projective Vector ◽  
Coordinate Rings ◽  
Resultant Matrix ◽  
The Given

Concepts from algebraic geometry such as cones and fans are related to toric varieties and can be applied to determine the convex polytopes and homogeneous coordinate rings of multivariate polynomial systems. The homogeneous coordinates of a system in its projective vector space can be associated with the entries of the resultant matrix of the system under consideration. This paper presents some conditions for the homogeneous coordinates of a certain system of bivariate polynomials through the construction and implementation of the Sylvester-Bèzout hybrid resultant matrix formulation. This basis of the implementation of the Bèzout block applies a combinatorial approach on a set of linear inequalities, named 5-rule. The inequalities involved the set of exponent vectors of the monomials of the system and the entries of the matrix are determined from the coefficients of facets variable known as brackets. The approach can determine the homogeneous coordinates of the given system and the entries of the Bèzout block. Conditions for determining the homogeneous coordinates are also given and proven.

scholarly journals Optimization of spaceflight millimeter-wave impedance matching networks using laser trimming

2021 ◽  
pp. 1-7
Author(s):  
K. Parow-Souchon ◽  
D. Cuadrado-Calle ◽  
S. Rea ◽  
M. Henry ◽  
M. Merritt ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Millimeter Wave ◽  
Impedance Matching ◽  
Wave Impedance ◽  
Low Noise ◽  
Device Performance ◽  
Interface Circuits ◽  
Interface Circuit ◽  
Noise Amplifier

Abstract Realizing packaged state-of-the-art performance of monolithic microwave integrated circuits (MMICs) operating at millimeter wavelengths presents significant challenges in terms of electrical interface circuitry and physical construction. For instance, even with the aid of modern electromagnetic simulation tools, modeling the interaction between the MMIC and its package embedding circuit can lack the necessary precision to achieve optimum device performance. Physical implementation also introduces inaccuracies and requires iterative interface component substitution that can produce variable results, is invasive and risks damaging the MMIC. This paper describes a novel method for in situ optimization of packaged millimeter-wave devices using a pulsed ultraviolet laser to remove pre-selected areas of interface circuit metallization. The method was successfully demonstrated through the optimization of a 183 GHz low noise amplifier destined for use on the MetOp-SG meteorological satellite series. An improvement in amplifier output return loss from an average of 12.9 dB to 22.7 dB was achieved across an operational frequency range of 175–191 GHz and the improved circuit reproduced. We believe that our in situ tuning technique can be applied more widely to planar millimeter-wave interface circuits that are critical in achieving optimum device performance.

Design of a Multifunctional Aircraft Skin With Energy Harvesting via Entropy Generation Minimization

Aerospace ◽  
2006 ◽  
Author(s):  
K. Ahlers ◽  
K. P. Hallinan ◽  
B. Sanders ◽  
R. McCarty
Keyword(s):  
Energy Harvesting ◽  
Entropy Generation ◽  
Waste Heat ◽  
Skin Layer ◽  
Skin Thickness ◽  
Power Devices ◽  
Volume Fractions ◽  
Entropy Generation Minimization ◽  
The Matrix ◽  
Aircraft Skin

The Entropy Generation Minimization (EGM) approach is applied to the design of a new integrated radar aircraft skin, which both meets requisite aircraft structural needs and provides a pathway for the waste heat from structurally integrated power devices. Thermoelectric (TE) devices, sandwiched between a heterogeneous skin layer and the radar devices for the purpose of harvesting waste heat rejected to the ambient, are considered in the analysis. A heterogeneous skin layer is designed using the EGM approach, which is then applied to the overall mission of the aircraft to determine the optimal skin thickness and volume fractions of the matrix and inclusions in the composite skin.

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