Inh.: Dr. Renate Gorre
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Series in Microelectronics
edited by Qiuting Huang
Mathieu Maurice Luisier
Vol. 139: Jan Thalheim,
Control Strategies for Balancing
of Series and Parallel Connected
2004. XVII, 186 pages, EUR 64,00.
This thesis investigates control methodologies for series and parallel connected IGBT/diode modules. It is proposed to provide each IGBT with primary local control to monitor and adjust the IGBT's static and dynamic behavior. Secondary (global) control synchronizes the operation of multiple IGBTs. A globally synchronous clock can also be derived locally. This makes it possible to use low-cost low-bandwidth data links between series-connected units. Thereby, a flexible master-slave approach can avoid the need of dedicated global control. That is, the entire system is manageable by the local gate drive circuitry. A prototype ASIC has been fabricated in CMOS technology with high-voltage extension. The driver is partitioned into fourteen clusters with a measured gate current capability of one Ampere each. A classification of the IGBT's collector-emitter voltage and collector current signals allows for real-time reconfiguration of the controller structure to optimize the dynamic response of the system. The conduction state and the recovery speed of freewheeling diodes are controlled by the voltage drop across the DC link inductance, which is locally estimated at each IGBT.
About the Author:
Jan Thalheim received the Dipl.lng. (M.Sc.) degree in electrical engineering from the University of Magdeburg, Germany, in 1996. His diploma thesis is on new concepts of auxiliary power supply via CAN bus data lines. He joined the Integrated Systems Laboratory (IIS) of the Swiss Federal Institute of Technology (ETH) Zurich, Switzerland as a research and teaching assistant. Main goal was the development of a Synchronous Intelligent Gate Unit (SIGU). SIGU is aimed on acceleration and synchronizing the operation of series and parallel connected IGBTs. In 2002 he joined CT-Concept Technology Ltd., where he heads the ASIC design group.
Keywords: Control Strategies for Balancing, Series and Parallel Connected IGBT/Diode Modules.
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