TY - CHAP A1 - Himmelstoss, Felix A1 - Votzi, Helmut T1 - Two-Stage Step-up Converter with Different Voltage Transformation Ratios depending on the Duty Cycle T2 - 20th International Conference on Renewable Energies and Power Quality (ICREPQ’22) Vigo (Spain), 27th to 29th July 2022 N2 - A two-stage converter with high output voltage ratio and reduced current stress of the inductors and partly reduced voltage stress is discussed. The function is explained with the help of voltage and current diagrams. The voltage transformation ratio changes between a quadratic step-up for duty cycles lower 0.5 and a double Boost converter for duty cycles higher than 0.5. Dimensioning hints, the control law for feed-forward controls, the transient when the supply is turned on is discussed and some simulations are given. A comparison to other two-stage converters is also treated. KW - Quadratic boost KW - double boost converter KW - feed-forward control KW - start-up Y1 - U6 - http://dx.doi.org/10.24084/repqj20.218 VL - Vol. 20 SP - 66 ER - TY - CHAP A1 - Himmelstoss, Felix A1 - Hofschweiger, Andreas A1 - Votzi, Helmut T1 - Quadratic Combined Forward-Flyback Converter T2 - Power Conversion and Intelligent Motion Conference (PCIM) 2023, May 9-11, 2023 Nurenberg, Germany KW - DC/DC converter KW - quadratic converter KW - forward KW - flyback Y1 - U6 - http://dx.doi.org/10.30420/566091315 SP - 1446 EP - 1453 ER - TY - CHAP A1 - Himmelstoss, Felix A1 - Ertl, Benjamin A1 - Votzi, Helmut T1 - A new limited duty cycle step-up converter T2 - International European Conference on Interdisciplinary Scientific Research, July 13-15, 2023, Rome, Italy KW - DC/DC converter KW - step-up converter KW - DC-grid KW - modeling KW - simulation Y1 - SP - 811 EP - 833 ER -