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Theses

Contribution à l'intégration monolithique de protections contre les surtensions :
application aux convertisseurs de puissance haute tension

Abstract : A new over-voltage protection circuit has been developed. In this protection circuit, the dissipative part is
monolithically integrated in the same protected power module chip with almost no additional technologic
process or modifications. This monolithic integration takes advantage of main switch cooling system to extract
over heating. At the same time it minimizes interconnections between the protected transistor and its protection
system. This gives high performance results in term of over voltage protection time response and thermal power
removal capabilities. In addition to that, the design of this protection circuit enables to adjust the protection
voltage threshold. This is useful for series transistor in high voltage applications. The design aims to improve
the performance and to reduce the cost and the volume of the protection circuit.
A model of the BJT as a protection transistor is established. This model is distinguished from the existing
models because of taking into account that the BJT is used in linear mode. A thermal model of the whole of the
integrated transistors evaluates the behavior of these transistors in spite of the difference between the operating
mode. This model gives the better distribution of the protection transistor cells in the chip. Practical results
starting from the auto protected MOSFETs components that we manufactured validates the solution suggested.
A demonstrator of a buck converter using two auto protected MOSFETs in series shows the effectiveness of our
solution.
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https://tel.archives-ouvertes.fr/tel-00165398
Contributor : Sylvie Garcia <>
Submitted on : Thursday, July 26, 2007 - 8:35:38 AM
Last modification on : Thursday, November 19, 2020 - 1:00:25 PM
Long-term archiving on: : Friday, April 9, 2010 - 12:03:47 AM

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  • HAL Id : tel-00165398, version 1

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Citation

Fisal Alkayal. Contribution à l'intégration monolithique de protections contre les surtensions :
application aux convertisseurs de puissance haute tension. Energie électrique. Institut National Polytechnique de Grenoble - INPG, 2005. Français. ⟨tel-00165398⟩

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