Publications by Raphaël Johannes Charles Mottet

Ultra-high voltage, low power and energy recovering electronics for dielectric elastomer actuators

Heart failure is a cardiovascular disease affecting between 1 and 2% of the population of developed countries alone - more than 10 million people - with this number bound to increase due to the ageing of the population. This condition starts to develop its ...

EPFL2022

Schmitt trigger-based control strategy for the discharge phase of an ultra-high-voltage bidirectional flyback

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet

The control strategy to discharge a capacitive load such as a dielectric elastomer actuator charged to several kilo-volts is critical to obtain a safe and reliable actuation. In the case of this publication, an ultra-high voltage bidirectional flyback conv ...

IEEE2021

Ultra-High-Voltage (7-kV) Bidirectional Flyback Converter Used to Drive Capacitive Actuators

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet, Morgan Almanza, Lucas Pniak

Dielectric elastomer actuators (DEAs) have extremely advantageous characteristics such as lightness, compactness, flexibility, and large displacements. However, in order to operate, they can require voltages in the order of several thousands of volts. Thus ...

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC2021

An Analytical Model for the Prediction of the Maximum Output Voltage Reachable with an Ultra-high Voltage Flyback Converter Driving Capacitive Actuators

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet

The DC-DC flyback converter is one of the most suitable topologies to generate the voltages necessary to operate Dielectric Elastomer Actuators. Voltages which can range from 5 to 20 kV. Previous works demonstrated through experiments the flyback’s ability ...

IEEE2021

DEA Self-discharge Characterization for Low Duty Cycle Applications

Yves Perriard, Yoan René Cyrille Civet, Raphaël Johannes Charles Mottet, Thomas Guillaume Martinez, Stefania Maria Aliki Konstantinidi

This publication presents the characterization of self discharging Dielectric Elastomer Actuators (DEAs) in order to give place to low duty cycle applications, during which a DEA must remain actuated for long periods of time. DEAs typically present a low c ...

IEEE2021

Control Strategy for the Discharge Phase of an Ultra-High Voltage (>7kV) Bi-Directional Flyback Converter Driving Capacitive Actuators

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet

Dielectric Elastomer Actuators (DEAs) require ultra high voltages in the order of several kilo volts to operate. To supply such voltages, a DC-DC flyback converter topology was selected. One of the main advantage of using such a structure is the possibilit ...

IEEE2020

Towards an ultra-high voltage gain, compact, and energy recovering Flyback DC/DC Converter

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet, Morgan Almanza

2019

High voltage switch for compact bidirectional dc-dc converter driving dielectric electroactive polymer actuators

Yves Perriard, Yoan René Cyrille Civet, Raphaël Johannes Charles Mottet, Morgan Almanza, Lucas Pniak

Driving DEAs requires time-varying high voltage power supplies, up to 18kV for 200um polymer layers. HV amplifiers are commonly used but bulky and expensive. Designing embedded actuators requires compact and efficient powersupplies. Furthermore, only a lit ...

2019

Critical Parasitic Elements of Coupled Inductors for Ultra-High Voltage Flyback Converters Used to Drive Capacitive Actuators

Yves Perriard, Alexis Boegli, Raphaël Johannes Charles Mottet, Morgan Almanza

This paper presents the critical parasitic elements of coupled inductors and their influence when designing a low input (12V) and ultra-high output voltage (>4000V) DC-DC Flyback Converter. The aim is to design a compact converter capable to supply the ult ...

IEEE2019

Electric Charge Transfer Between Cascading Dielectric Electroactive Polymer Actuators

Yves Perriard, Alexis Boegli, Jonathan André Jean-Marie Chavanne, Raphaël Johannes Charles Mottet

With the never slowing interest in dielectric electroactive polymer (DEAP) actuators for medical applications, the need to optimize the management of the driving energy of these actuators becomes evermore important. In order to tackle the problematic of th ...

2018

Analysis and Reduction of Time Response in Thermally Activated Shape Memory Alloys

Yves Perriard, Yoan René Cyrille Civet, Mario Joe Lehmann, Raphaël Johannes Charles Mottet, Sean Thomas

This paper aims to study the factors that affect the time response of Shape Memory Alloys (SMA) and establish a method to improve their activation times. In this work, different parameters such as the number, positions and orientation of the perforations o ...

2018