https://hdl.handle.net/11000/446 2026-04-03T18:04:44Z https://hdl.handle.net/11000/34751 Título : High-Reliability Solar Array Regulator Proposal for Harsh Environments Autor : Carrasco, Jose A; Torres, Cristian; Blanes, José Manuel; Garrigós, Ausias; Marroquí, David; Orts, Carlos Resumen : This paper presents a fault-tolerant solar array regulator intended for isolated applications where reliability is critical. For this, it is proposed an architecture similar as the one used in the space sector, in which reliability and fault tolerance are essential. The proposed regulator is composed of six phases, each one powered from a string of 20 solar cells. Each of these phases has a Buck converter controlled by a double control loop, that can control both the voltage in the batteries and the power generated in the solar arrays. To maximize this extracted power, each phase has a maximum power point tracker (MPPT) circuit. In addition, the converter has a redundant over voltage protection (OVP) system that powers off all the converters in case of battery overvoltage. In addition, this regulator is tolerant to the failure of any of its components. This work describes the design of each of the developed subsystems that compose the regulator, as well as the implementation of a 60W prototype and the tests carried out. 2025-01-16T19:50:21Z https://hdl.handle.net/11000/34745 Título : On the Implementation of a DC-DC Power Supply for Reducing Electromagnetic Interference from Power Converters and Filters Autor : Carrasco, Jose A; García de Quirós Nieto, Francisco Javier; Garrigós, Ausias; Blanes, Jose M.; Marroquí, David; Sanchis Kilders, Esteban; Ejea, Juan B; FERRERES, AGUSTIN; Gilabert-Palmer, David; de la Viuda, Isamel; Cora, M.; Junge, Axel; Landstroem, Sven Resumen : Together with mass, volume and efficiency, reduction of electromagnetic interference emission should drive the power supplies optimization criteria at the start of the design process. Although basic methods for filtering and shielding exist to reduce electromagnetic emissions below the ECSS mask margins, systematic techniques, based on symmetry, impedance matching and balancing, distributed and multi-point grounding, spread-spectrum techniques or even utilization of chaotic behaviour have the potential of reducing electromagnetic emissions beyond simply increasing the size of common and differential mode filters. This paper provides a practical comparison of six DC-DC low power converters that implement different techniques for such reduction with the overall goal of positioning the conducted emissions on the primary power bus in the frequency domain for differential and common mode currents more than 20dB below the limits in ECSS-E-ST-20-07C. The conclusions are expected to not only result in better reduction of electromagnetic interference for missions with especially sensitive payloads or scientific instruments and their demanding requirements, but also to provide mass and volume reductions for generic emission requirements. 2025-01-16T19:45:49Z