Martí Franquès Research Fellowship Programme

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Contracts for research groups
Trainee predoctoral researcher
In general, be in possession of an official undergraduate degree, or equivalent, and of a master degree, and have passed a minimum of 300 ECTS credits during the course of their official university studies, of which at least 60 must be master`s degree credits.
Department of Electronic, Electric and Automatic Engineering
Ultrafast Modular Battery Charger for electric-vehicle batteries.
Hugo Valderrama Blavi
Angel Cid Pastor
There exist a clear consensus in admitting that the main obstacles that complicate the market penetration of EBS are the so called range anxiety (fear of not having enough charge in the vehicle), customer price, charging time and charging availability, all of them related to the battery. An EVB onboard charger, which is connected to a single-phase AC domestic supply, require for instance, more than 8 hours are required to add 300 km of autonomy when a 240 V domestic charger is used. Existing public DC fast charging facilities can deliver a power of 50-100 kW providing autonomy of 300 km after one hour of charging. A variety of them requiring up to 350 kW using only 10 minutes of charge to supply the same amount of energy has arisen as a necessity. Our research work will center at this last point, an ultrafast charger, and more specifically the third and fifth, CURVE ministry project objectives, that is (03) and (05). -(03): Design of a hybrid microgrid DC-AC at scale 1:10 for ultrafast charging. -(05): Design and implementation of unidirectional switching converter for ultrafast charging of the battery from the DC bus. After some research months, and according to the work of D: Zambrano et al, presented at SAAEI`21 conference, we have actualized the electric charging station architecture and it will include two voltage buses, a 380V and a 1500V one. The research proposed for the PhD candidate will deploy the CURVE objectives (03) and (05), and are the following ones: OT1. Analyze the electrical architectures to step down the 1500V voltage bus to 400V or 800V, that are the current and future electric car battery voltage standards. This include galvanically-isolated structures and direct converters. OT2. To manage the amount of power required in a 10-minute charge, different paralleling algorithms of modular step-down converters must be proposed, studied, analyzed, and some of them simulated and implemented. OT3. As these converters should work at constant load current, constant voltage and sometimes even at constant power conditions, depending on the battery charging algorithm, it is required to analyze all the stability issues that can appear. This applies to all the structures proposed in objective 1, and paralleling strategy algorithms from objective 2. This objective should deliver different control strategies at converter level, and a supervisory level to manage the different parallelized modules. OT4. Feasibility and evaluation of the converters and/or structures proposed in objective 1, with and without the paralleling mechanisms proposed in 2, and controls strategies developed in objective 3, by means of PSIM simulation. This implies to establish a common performance variables or parameters to compare all the previous proposed design. OT5. The use of passive networks in a switching converter can also help to stabilize such kind of systems. The key issue is to eliminate the electrical losses of these passive networks, becoming then active, keeping only the stabilizing behavior. We will investigate if introducing LFR-based converters in series with main converter inductors, for instance is suitable to deal with the stabilities issues of ultrafast charging step-down architectures. OT6. To develop an scale experimental demonstrator it is needed to find a given set of ratings-specifications. This means to establish a set of ratings in power, input/ output voltages, and input/output currents. A set of proportionality factors (compared with the nominal ratings required for a real ultrafast charging station ) must be investigated. OT7. To build and verify an experimental scale demonstrator of ultrafast step-down charger according to the ratings deduced from objective 6. OT8. At any stage of the proposed research, the dissemination of the research results, including conferences and publishing papers in high impact-factor journals, both open-access and regular-access. OT9. Writing of the PhD document and PhD dissertation. Highly desirable attributes of the ideal candidate * Demonstrated previous experience in one or more of the following topics: power electronics and design of switching converters, automatic control applied to power converters, electric mobility. * Hold a Master degree, or equivalent, in: power electronics converters and control as key issues. * Language skills: * Specific Software skills: PSIM, MATLAB * Other skills: * Personality traits:
Technologies for Nanosystems, Bioengineering and Energy
12 months
Full time
16450.20 €
37.5 hours a week
a determinar
01 December 2021
  1. Photocopy of identity card, resident`s card or passport currently in force
  2. Curriculum Vitae
  3. Photocopy of the certificate of the official academic qualification or proof of payment of the fees for the issuance of the certificate that allows the holder to access the doctoral studies. Students who are registered on an official university master`s course that allows them to access the doctoral programme during the 2021/2022 academic year must present a photocopy of their master`s course registration form.
  4. Academic transcript of the undergraduate degree issued in one of the following languages: Catalan, Spanish, English, French, Italian or Portuguese.
  5. Academic transcript of the master`s degree issued in one of the following languages: Catalan, Spanish, English, French, Italian or Portuguese. Candidates who have not completed their master’s degrees must send their provisional academic transcript.
  6. Declaration of equivalence calculated in accordance with the resolutions of 21 March 2016, 21 July 2016 and 18 September 2017 of the General Directorate of University Policy of the Spanish Ministry of Education, Culture and Sport or the resolutions that are effect at the moment when the application is presented
  7. Motivation letter (Optional)
  8. Reference letter (Optional)
  9. Accreditation of linguistic knowledge of English (Optional)
06 September 2021