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Switched-capacitor power converters for high-Vin applications

  • In recent years, significant progress was made on switched-capacitor DCDC converters as they enable fully integrated on chip power management. New converter topologies overcame the fixed input-to-output voltage limitation and achieved high efficiency at high power densities. SC converters are attractive to not only mobile handheld devices with small input and output voltages, but also for power conversion in IoTs, industrial and automotive applications, etc. Such applications need to be capable of handling high input voltages of more than 10V. This talk highlights the challenges of the required supporting circuits and high voltage techniques, which arise for high Vin SC converters. It includes level shifters, charge pumps and back-to-back switches. High Vin conversion is demonstrated in a 4:1 SC DCDC converter with an input voltage as high as 17V with a peak efficiency of 45 %, and a buckboost SC converter with an input voltage range starting from 2 up to 13V, which utilizes a total of 17 ratios and achieves a peak efficiency of 81.5 %. Furthermore a highly integrated micro power supply approach is introduced, which is connected directly to the 120/230 Vrms mains, with an output power of 3mW, resulting in a power density >390μW/mm², which exceeds prior art by a factor of 11.

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Author of HS ReutlingenLutz, Daniel; Renz, Peter; Wicht, Bernhard
Erschienen in:Analog Workshop 2017 : March 2-3, 2017, Technische Universität Berlin
Publisher:Technische Universität Berlin
Place of publication:Berlin
Editor: Gerfers, Friedel
Document Type:Conference proceeding
Publication year:2017
Page Number:2
First Page:26
Last Page:27
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open access?:Ja
Licence (German):License Logo  Open Access