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IGBT-Module integrated Current and Temperature Sense Features based on Sigma-Delta Converter

System integration is one of the market driving issues in power electronics. In this paper the integration of precise shunts into IGBT modules, like it is done in Infineons MIPAQ™ family, is compared to on-IGBT-chip current sense functionality. Temperature measurement via NTC-resistor on DBC-level or on-IGBT-chip integrated temp-sense-diodes will be treated as well. Further processing of the low voltage sense signals is done by sigma-delta converter including a functional isolation barrier by Coreless Transformer Technology (CLT). Modern industrial inverter applications like precise high speed servo drives require accurately dosed electrical energy at high power levels provided by modern semiconductor inverter systems. For speed/torque control and protective functions of the drive system, several measurement points like instantaneous inverter output current, dc-link voltage, high power semiconductor junction temperature, etc. have to be captured during converter operation. Recent research, development effort and improvements in power electronics allow the integration of sense functionality into high power modules to reduce space, to increase the reliability and to save costs of the converter system. In this paper, two ways of integrating current and temperature measurement for control and protection functions will be shown, explained and discussed

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31/01/2011