J. M. Kauffmann

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Several industrial applications require the production of an accurately regulated frequency power output, from a variable frequency power source; such as variable speed constant frequency generating systems (VSCF) for aircraft and mobile power supplies. A new control strategy based on the cosine wave crossing control is applied to a naturally commutated(More)
This paper presents the study and experimental validation of a high frequency (HF) power converter used in a powertrain composed of a polymer electrolyte fuel cell (PEFC) generator based on a multi-stack association and dedicated to transportation applications. As a first approach, the architecture of the system presented in this paper has been limited to(More)
This article presents a constrained optimization method, based on the duality theory, which does not need the gradients. The method is used to optimize superconducting devices. In order to reduce the computing effort, the initial optimization problem is divided into two coupled optimization problems. One manages the geometrical parameters, the other finds(More)
This paper presents the design, realization and power management of an auxiliary power unit (APU) dedicated to vehicle applications. The proposed APU is based on a parallel arrangement of a polymer electrolyte fuel cell (PEFC) and a supercapacitor bank. Using such an arrangement, the PEFC provides only the mean power to a 42 V DC embedded bus, whereas the(More)
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