The main goal of this thesis is to develop an active thermal management control scheme for multi-phase current mode buck converters in order to improve the long term reliability of the converters. A thermal management unit (TMU) with independent linear compensators for the thermal loops is incorporated into the existing digital controller to regulate the current through each phase so that equal temperature distribution is achieved across all phases. A lumped parameter thermal model of the multi-phase converter is built as the basis of the TMU. iii
This paper demonstrates a new digital controller for thermal management in multi-phase current mode buck converters. While the majority of today's multi-phase designs emphasize equal load current sharing between all phases, variations in PCB layout, parasitic resistances, transistor on-resistance (Ron), and airÁow, cause signiÀcant temperature variations between the converter phases. In this work, a digital multi-variable thermal management unit (TMU) based on H 2 -optimization theory is demonstrated to rapidly achieve a uniform temperature distribution by adjusting the phase currents. Experimental results from a digitally controlled 12 V to 1 V, 50 A, 250 kHz fourphase peak current mode buck converter demonstrate a 5.1 • C reduction in peak phase temperature and a 10.6 • C reduction in phase temperature differences. This illustrates the effectiveness of the proposed thermal management technique in the presence of uneven air Áow and multiple load steps. Infrared scans of the converter conÀrm that the peak and average temperatures are reduced, leading to improved long-term reliability. The TMU also exhibits stable transient response during load steps.
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