000K utf8 1100 $c2016 1500 eng 2050 urn:nbn:de:gbv:8-publ-14592 2051 10.1109/IECON.2016.7793676 3000 Andresen, Markus 3010 Buticchi, Giampaolo 3010 Liserre, Marco 4000 Active thermal control of isolated soft switching DC/DC converters [Andresen, Markus] 4209 Power Semiconductors undergo thermal stress during operation, which is caused by thermal cycling. This refers to heating up and cooling down of the junction temperature and leads to aging and finally failures. Active thermal control can reduce the thermal stress of power semiconductors by regulating the power losses. Most algorithms proposed so far are only applicable to hard switching power converters and implement a regulation of the switching frequency, which is not applicable for the isolated DC/DC converters. This work proposes to regulate the duty cycle of the DC/DC converter to control the semiconductor losses, aiming at influencing the consequent thermal stress. The proposed algorithm is analyzed analytically and a thermal controller is designed, which is capable of reducing thermal cycles during operation without prior knowledge about the mission profile. The capability and the limitations of the proposed algorithm are demonstrated with simulations and the effectiveness is validated on a laboratory prototype with junction temperature measurement. 4950 https://doi.org/10.1109/IECON.2016.7793676$xR$3Volltext$534 4950 https://nbn-resolving.org/urn:nbn:de:gbv:8-publ-14592$xR$3Volltext$534 4961 https://macau.uni-kiel.de/receive/publ_mods_00001459 5051 621.3 5550 Active thermal control