Operation and Design of VHF Self-Oscillating DC-DC Converter with Integrated Transformer
Igor M. Filanovsky,
University of Alberta –
Increasing the operating frequency of the DC-DC converter is a direct way of reducing the size of energy storage elements such as bulky capacitors and inductors, which usually dominate the overall converter size. The challenges arise when the converter operating frequency is increased into Very High Frequency (VHF) range from 30 MHz to 300 MHz; the conventional topologies become impractical. In the literature one can find the converter circuits suitable for operation in this frequency range. Some of them, for the lower end of the band, were breadboard prototyped, yet, their fully integrated realization, to the best of our knowledge, is not known yet.
The VHF converters may be loosely qualified as the circuits with self-oscillating resonant gate drivers. This driver is realized using a separate from load oscillating circuit. In our case the load and feedback circuits are combined using one integrated transformer. Usually an integrated coil is realized using the top metal layer of lowest resistivity.
The layers under this coil can be used to create a transformer secondary without any additional silicon area. The transformer parameters and layout were carefully investigated, and it happens that the high resistance of the secondary is only beneficial in our case: the secondary operates as open circuit, it does not introduce any load in the primary, the description of the circuit operation is simplified, and the oscillation frequency may be evaluated.
In the proposed converter the primary represents a “necessary” passive connection providing the path from the power supply to the capacitive load. The core of the system is the feedback loop. The feedback loop, besides of the secondary, includes a duty cycle detector and a pulse-shaping circuit. The output signals of the pulse-shaping circuit represent two in-phase rectangular pulses driving the gates of power transistors. As usual in the feedback systems, it is the feedback that determines such parameters as, for example, the system stability. For this reason we provide full calculation of signals in the duty cycle detector.
We describe the full circuit of the proposed converter and its operation principle. Then the detailed analysis of the signals in the duty cycle detector is given. The recommendations on smooth start-up of the converter power transient are provided. Then we describe the circuit layout. Finally, we discuss the obtained results and outline the direction of further investigation.
Igor M. Filanovsky received the M.Sc. degree in 1962 and the Ph.D. degree in 1968, both in electrical engineering from V. I. Ulianov (Lenin) Institute of Electrical Engineering, Leningrad, USSR. In 1976, he joined the University of Alberta, Canada, where he is currently a Professor Emeritus. Dr. I. M. Filanovsky is the author or coauthor of 9 books and about 300 journal and conference papers on circuit theory (theory of approximation, theory and technical applications of oscillations, strongly nonlinear oscillations), and applied microelectronics (analog electronic circuits, oscillators and multivibrators, signal-conditioning circuits for sensors). He has four patents on electronic circuits. His paper ”A 100 dB CMRR CMOS Operational Amplifier with Single-Supply Capability,” co-authors V. Ivanov and Junlin Zhou, obtained “The Best Paper Award” at the International Conference on Electronics, Circuits and Systems, ICECS2004, Tel-Aviv, Israel. Dr. I. M. Filanovsky is currently an Associated Editor of CTA.
Date: 2015-Nov-23 Time: 14:00:00 Room: 336
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OLISSIPO Summer School in Lisbon | Computational phylogenetics to analyse the evolution of cells and communities
We are happy to announce the OLISSIPO Summer School on Computational phylogenetics to analyse the evolution of cells and communities, which will be held in Lisbon, Portugal, at INESC-ID, between July 2-7, 2023.
David Posada, University of Vigo (class)
João Alves, University of Vigo (hands-on)
Nadia El-Mabrouk, Université de Montréal (class)
Mattéo Delabre, Université de Montréal (hands-on)
Ran Libeskind-Hadas, Claremont McKenna College (class and hands-on)
Russell Schwartz, Carnegie Mellon University (class and hands-on)
See the preliminary agenda at: https://olissipo.inesc-id.pt/tree-tango-school
Registration is mandatory. You can register at: https://forms.gle/VsASFHW5E7MJvaCc9
The registration fee is 250€ for students and OLISSIPO members and 350€ for postdocs or other researchers (meals indicated at the schedule of the school are included, accommodation and flights are not). All details will be made available upon registration.
We will have slots for flash talks (3-10 min depending on the number of submissions) to present yourself and the work you have been developing in your research.
The 13th Lisbon Machine Learning School | LxMLS 2023
The Lisbon Machine Learning Summer School (LxMLS) takes place yearly at Instituto Superior Técnico (IST). LxMLS 2023 will be a 6-day event (14-20 July, 2023), scheduled to take place as an in-person event.
The school covers a range of machine learning topics, from theory to practice, that are important in solving natural language processing problems arising in different application areas. It is organized jointly by Instituto Superior Técnico (IST), a leading Engineering and Science school in Portugal, the Instituto de Telecomunicações, the Instituto de Engenharia de Sistemas e Computadores, Investigação e Desenvolvimento em Lisboa (INESC-ID), the Lisbon ELLIS Unit for Learning and Intelligent Systems (LUMLIS), Unbabel, Zendesk, and IBM Research.
Check online for information about past editions: LxMLS 2011, LxMLS 2012, LxMLS 2013, LxMLS 2014, LxMLS 2015, LxMLS 2016, LxMLS 2017, LxMLS 2018, LxMLS 2019, LxMLS 2020, LxMLS 2021, LxMLS 2022 (you can also watch the videos of the lectures for 2016, 2017, 2018, and 2020).
31st International Conference on Information Systems Development (ISD 2023)
The 31st International Conference on Information Systems Development (ISD 2023) conference provides a forum for research and developments in the field of information systems. The theme of ISD 2023 is “Information systems development, organizational aspects and societal trends”. New trends in developing information systems emphasize the continuous collaboration between developers and operators in order to optimize the software delivery time. The conference promotes research on methodological and technological issues and how IS developers and operators are transforming organizations and society through information systems.
The ISD 2023 conference held this year also provides an opportunity for researchers and practitioners to promote their research, practical experience, and to discuss issues related to Information Systems through papers, posters, and journal-first paper presentations.
ISD 2023 will be hosted by Instituto Superior Técnico, in Lisbon, Portugal, on August 30–September 1, 2023.