Christophe Winter

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In the scope of haptic touch feedback actuators, we discuss the phenomenon of creating the haptic experience by squeezing the air film between the user finger and the actuator. The focus is given in the modeling of the squeeze film effect. An existing analytical model is compared with FEM simulations and early experimental measurements are presented.
The power stage of a resonant piezoelectric actuators is difficult to design due to the high static capacitance of the actuator. It creates a lot of reactive power to compensate and can cause stability issues. This work presents a design of a resonant current inverter to drive actuators with a sine excitation biased with a DC offset with voltages and(More)
Sense of touch belongs to one of the five Human Senses. Whereas blind people largely use feeling in everyday life, sighted person mainly focus on hearing and vision. However, haptic interface started being introduced in customers applications, such as smartphone, to propose new opportunities to users. A surface put in vibration nearby another can modify the(More)
This paper presents the multi-objective optimisation of an Inductive Coupled Power Transfer (ICPT) device. A setup as complicated as the one at hand in this paper is extremely hard to model analytically. To acquire some knowledge about the influence of the geometric factors, a sensitivity analysis is first performed using design of experiment (DoE) and(More)
In the analysis of squeeze film haptic tactile feedback actuator, we focus our attention on establishing an empirical model of the force generated on the user's finger. The model is based on FEM simulations which take into account the real motion of the actuator. As analytical model exists for a very few special cases, we expose a methodology to establish(More)
An haptic tactile interface (HTI) feedback device is presented. Its finite element (FE) model is presented and explained. Comparison between FE predictions and measurements are performed in order to validate the modeling approach. Finally a functional demonstrator is built allowing users to feel a new experience of touch control electronic devices.
The driving electronics of an haptic tactile interface (HTI) is presented. The stability of its linear power amplifier under the capacitive load of the HTI piezoelectric actuator is analysed and ensured. As the HTI actuator is a resonant one, a topology to compensate its reactive power is presented allowing to reduce the size and the thermal heating of the(More)
In this paper, the magnetic coupling between an induction cooker and a metallic pot is studied for various winding topologies. Effects of the winding orientation on the power transfer capability and on the emitted magnetic field under the cooker are discussed and compared. A novel topology inspired by permanent magnet Halbach array is proposed. This(More)
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