TY - GEN A1 - Mendonça, Lucas Sangoi A1 - Radecker, Matthias A1 - Killat, Dirk A1 - Bisogno, Fábio Ecke T1 - Ultrasound Piezo-Harvester Energy Transfer Systems for Machine Tool Sensor-Charger Applications T2 - PCIM Europe : International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management, Nuremberg, 07.- 09. May 2019 N2 - Ultrasound energy transfer systems can be an alternative for sensor-chargers aiming battery replacement avoidance and can be used in machine tool applications. An ultrasound input source can be used to send an acoustic signal through a machine. The signal is received by an ultrasound receiver based on piezoelectric component and should be converted into an electrical signal to supply or charge the sensor. Notwithstanding, for rotating machines, an air gap must be considered between the input source and the machine tool part. This paper deals with the acoustic-electrical energy transfer considering the changes in the propagation media of the ultrasound. Theoretical results are verified by means of an experimental setup. Y1 - 2019 UR - https://ieeexplore.ieee.org/xpl/conhome/8767470/proceeding SN - 978-3-8007-4938-6 PB - VDE VERLAG CY - Berlin ER - TY - GEN A1 - Martins, Leandro Tomé A1 - Radecker, Matthias A1 - Fracaro, Marcelo Henrique A1 - Mendonça, Lucas Sangoi A1 - Bisogno, Fábio Ecke A1 - Killat, Dirk T1 - Modeling and Design of a Linear-Assisted Zeta Conveter T2 - 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) N2 - Linear-assisted switching (PWM) converters have advantages over single switching topologies, mainly because of the reduction or elimination of bulky output capacitors and ultra-fast dynamical response. In this paper, a linear-assisted zeta converter is presented. The linear regulator circuit is composed by three bipolar transistors and an operational amplifier, which drives the transistor based on the error between the output voltage and its reference. The modeling of the whole circuit is presented, as well as a design example. The modeling of the zeta converter is similar to the conventional topology modeling, except the fact that the linear regulator current is considered as an extra state that substitutes the state regarding the output capacitor voltage. The zeta converter can be designed independently of the linear regulator circuit and simulations are used to validate the static operation of the overall topology. Experimental results confirm in practice the ripple compensation of the main zeta converter, where extra current is provided by the main converter, in order to drive the linear regulator that is responsible for the ripple compensation. Y1 - 2019 U6 - https://doi.org/10.23919/EPE.2019.8914764 PB - VDE CY - Berlin ER - TY - GEN A1 - Mendonca, Lucas Sangoi A1 - Radecker, Matthias A1 - Killat, Dirk A1 - Bisogno, Fábio Ecke T1 - Normalized State-Space Models of Resonant Rectifiers T2 - 2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany N2 - In AC-DC power conversion, the input source features: time dependence and phase angle, combined with the complexity of resonant circuits, lead to solutions that are difficult to obtain. In this sense, an analysis and design methodology of resonant rectifiers is proposed, in which, iterative numerical solutions are replaced by analytic solutions with the help of computer algebra systems. The method allows obtaining the AC-to-DC transfer function, the quality factor, the phase angle and the resonance frequency. A case study for the Class-E zero-derivative voltage switched resonant rectifier is performed. Experimental results are shown in order to validate the theoretical approach. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8890156 SN - 978-3-948571-00-9 ER - TY - GEN A1 - Ulmann, Bernd A1 - Killat, Dirk T1 - Solving systems of linear equations on analog computers T2 - 2019 Kleinheubach Conference, September 23-25, 2019, Miltenberg, Germany N2 - Solving systems of linear equations is a central task not only in artificial intelligence. This article outlines a technique making it possible to employ analog computers to the solution of such equations. Using iterative techniques it is even possible to setup a hybrid computer, i. e. a combination of a classic digital and an analog computer, where the analog portion can be used as a co-processor. If the solutions obtained by pure analog computing are not of the required accuracy, it is possible to use these as initial vectors for a classic iterative algorithm running on the digital computer to further enhance the precision of the solution obtained. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8890096 SN - 978-3-948571-00-9 ER - TY - GEN A1 - Mendonca, Lucas Sangoi A1 - Martins, Leandro Tomé A1 - Radecker, Matthias A1 - Bisogno, Fábio Ecke A1 - Killat, Dirk T1 - Normalized Modeling of Piezoelectric Energy Harvester Based on Equivalence Transformation and Unit-Less Parameters T2 - Journal of Microelectromechanical Systems N2 - Micro-electromechanical systems are ubiquitous in several energy harvesting solutions and can be used in applications such as bio-implantable devices and wireless micro-sensors. Piezoelectricity is an interesting key to perform the interface between environmental extracted energy and the power delivered to the load due to the use of mechanical vibration and resonance features. However, it is necessary for a detailed analysis in order to obtain an accurate understanding of the system. In this regard, some works deal with the normalization procedures to analyze the piezoelectric component behavior based on the mechanical resonance frequency. In order to enhance the system modeling, the electromechanical resonance frequency must also be analyzed. This paper deals with an approach to model the piezoelectric component that allows analyzing several unitless parameters that are critical to improve the performance of the system. In addition, a state-space model for the piezo-harvester based on the Class-E resonant rectifier is presented. Some experimental results are shown to validate the theoretical approach. [2019-0082]. Y1 - 2019 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8745680 U6 - https://doi.org/10.1109/JMEMS.2019.2921649 SN - 1941-0158 SN - 1057-7157 VL - 28 IS - 4 SP - 666 EP - 677 ER - TY - GEN A1 - Bramburger, Stefan A1 - Killat, Dirk T1 - 10-bit tracking ADC with a multi-bit quantizer, variable step size and segmented current-steering DAC T2 - Advances in Radio Science N2 - This paper presents a 10-bit tracking ADC using a multi-bit quantiser and a segmented current-steering DAC. The quantiser allows a dynamical adjustment of the step size dependent on the input signal waveform. This mitigates the limited slew rate of delta encoded ADCs. Energy consumption induced by 1 LSB ripple is removed by the quantiser. The segmented current-steering DAC allows simple control, good monotonicity and improved transient response when compared to previous design as well as potential power reduction. Y1 - 2019 UR - https://ars.copernicus.org/articles/17/161/2019/ U6 - https://doi.org/10.5194/ars-17-161-2019 SN - 1684-9973 SN - 1684-9965 VL - Vol. 17 SP - 161 EP - 167 ER -