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A 20 V, 8 MHz resonant DCDC converter with predictive control for 1 ns resolution soft-switching

  • Fast switching power supplies allow to reduce the size and cost of external passive components. However, the capacitive switching losses of the power stage will increase and become the dominant part of the total losses. Therefore, resonant topologies are the known key to reduce the losses of the power stage. A power switch with an additional resonant circuit can be turned on under soft-switching conditions, ideally with zero-voltage-switching (ZVS). As conventional resonant converts are only efficient for a constant load, this paper presents a predictive regulation loop to approach soft-switching conditions under varying load and component tolerances. A sample and hold based detection circuit is utilized to control the turn-on of the power switch by a digital regulation. The proposed design was fabricated in a 180 nm high-voltage BiCMOS technology. The efficiency of the converter was measured to be increased by up to 16 % vs. worst case timing and by 13 % compared to a conventional hard-switching buck converter at 20 V input voltage and at approximately 8 MHz switching frequency.

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Author of HS ReutlingenFunk, Tobias; Wittmann, Jürgen; Wicht, Bernhard
Erschienen in:IEEE International Symposium on Circuits and Systems (ISCAS), 2015 : 24 - 27 May 2015, Lisbon, Portugal
Place of publication:Piscataway, NJ
Document Type:Conference proceeding
Publication year:2015
Page Number:4
First Page:1742
Last Page:1745
DDC classes:621 Angewandte Physik
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt