Journal ArticleDOI
A New Isolated Topology of DC-DC Converter based on Piezoelectric Resonators
TLDR
In this article , the authors presented a new isolated topology of DC-DC converter based on piezoelectric resonators, which uses the natural isolation of PAs to isolate the converter's output from the input and vice-versa.Abstract:
This paper presents a new isolated topology of DC-DC converter based on piezoelectric resonators. Contrary to most existing topologies, the proposed one uses the natural isolation of piezoelectric resonators to isolate the converter's output from the input and vice-versa. Considering the resonators' constraints, our study focuses on the most efficient isolated conversion cycle with zero-voltage switching (ZVS) operations. The case studied is a highly efficient step-down isolated DC-DC converter with a gain ranging from 0 to 1 and an input voltage up to 360 V. The converter uses two piezoelectric resonators working in series. The conversion principle is validated thanks to a prototype operating at a frequency around 95 kHz. Experimental measurements are made on a wide range of input voltage from 12 V to 360 V with a conversion ratio of 0.0165 to 0.95. The output power reaches either 179.1 W with an 89% efficiency at 360 V input voltage and 346 V output voltage, or 4.5 W with a 97.2% peak efficiency for a 48 V to 45.8 V conversion, using a 25 mm piezoelectric disc with a thickness of 2 mm and 1 mm respectively. An efficiency higher than 80% is measured over a wide range of operating points. read more
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Journal ArticleDOI
The Piezo-Electric Resonator and Its Equivalent Network
TL;DR: The theory of the piezo-electric and the mechanical behavior of a quartz resonator was discussed by Voight and Cady as discussed by the authors, and the functions of the quartz as dielectric and as vibrator were shown to be separable and replaceable by a condenser in parallel with an electrical resonator.
Journal ArticleDOI
Piezoelectric Transformers: An Historical Review
TL;DR: The history of piezoelectric transformers can be summarized in this article, which summarizes the historical evolution of the technology and summarizes the relevant work of some excellent researchers as well as to the evolution in materials, manufacturing processes, and driving circuit techniques.
Journal ArticleDOI
A New Non-Isolated Low-Power Inductorless Piezoelectric DC–DC Converter
TL;DR: In this paper, a non-isolated low-power inductorless piezoelectric resonant converter is proposed to dynamically adjust the output power and ratio keeping a high efficiency for a large range of output powers.
Journal ArticleDOI
Optimized Resonators for Piezoelectric Power Conversion
Weston D. Braun,Eric A. Stolt,Lei Gu,Jeronimo Segovia-Fernandez,Sombuddha Chakraborty,Ruochen Lu,Juan Rivas-Davila +6 more
TL;DR: In this article, the impact of resonator parameters on the performance of the piezoelectric resonator based dc-dc converter, derive the optimal load impedance and efficiency limits, and analyze the impacts of varying conversion ratio and load impedance.
Book
High-Power Piezoelectrics and Loss Mechanisms
TL;DR: In this paper, the authors review the loss phenomenology in piezoelectrics, including three losses, including dielectric, elastic and PZoelectric losses, and propose new driving schemes to minimize the losses and maximize the transducer efficiency.