Henk Jan Bergveld

Learn More
Modeling Battery Behavior for Accurate State-of-Charge Indication V. Pop,* H. J. Bergveld, J. H. G. Op het Veld, P. P. L. Regtien, D. Danilov,** and P. H. L. Notten** Measurement and Instrumentation, University of Twente, 7500 AE, Enschede, The Netherlands Philips Research Laboratories, Mixed-Signal Circuits and Systems, 5656 AE, Eindhoven, The Netherlands(More)
This work proposes a switching policy for multi-level fullbridge switching power converters and analyses their performance by driving them with a multi-level PWM modulation, targeting highefficiency power amplifiers. Unlike conventional policies, which generate the output voltage levels only from the values of the supply voltages, this enhanced policy also(More)
• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the(More)
Accurate State-of-Charge (SoC) and remaining runfully charged or it is overcharged. In the former case, the time indication for portable devices is important for the userbattery will be recharged more often than needed, which will convenience and to prolong the lifetime of batteries. However, the lead to an earlier wear-out. In the latter case, frequent(More)
• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the(More)
—— The known methods of State-of-Charge (SoC) indication in portable applications are not accurate enough under all practical conditions. This paper describes a realtime evaluation LabVIEW system for an SoC algorithm, that calculates the SoC in [%] and also the remaining run-time available under the valid discharge conditions. With the described system the(More)
Battery is the most widely used energy storage device. Since its invention, it has become a common power source for various household, commercial and industrial applications. Despite its ever increasing importance, many challenges remain unsolved to characterize and manage the battery. Among them, one fundamental issue is the estimation of state of charge(More)
With the increasing number of voltage conversions that have to be efficiently implemented in a mobile device, the PCB space occupied by switched-mode DC-DC converters with external passive components will become unacceptably high. Therefore, a clear need exists for small-form-factor high-efficiency DC-DC converters having the necessary passive components(More)