Dynamic and Steady-State Models for the PRC-LCC Resonant Topology With a Capacitor as Output Filter

• Published in: IEEE transactions on industrial electronics (1982) Vol. 54; no. 4; pp. 2262 - 2275
• Main Authors: Martin-Ramos, J.A., Diaz, J., Pernia, A.M., Lopera, J.M., Nuno, F.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.08.2007; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Capacitance; Capacitors; DC/DC converters; Dynamic tests; Dynamics; Equivalent circuits; Filters; high voltage; Inductance; modeling; Rectifiers; Resonance; resonant converters; Steady state; Studies; Topology; Transformers; Voltage
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2007.894763

In high-voltage DC power supplies (hundreds of kilovolts), avoiding the inductance in the output filter is an important asset. Thus, a capacitor as a unique component of that filter is preferable. On the other hand, a high-voltage step-up transformer shows a high capacitance in its secondary, which can be included in a resonant stage. Both capacitances, i.e., one from the filter and the other from the transformer, are separated by the output rectifier. When this rectifier is on, they are in parallel; when it is off, they are disconnected. A resonant stage where a very large capacitor appears and disappears several times in one period is not linear and has not been dynamically modeled before. This paper shows two simple models for the parallel-series (LCC-type parallel resonant converter) resonant topology with a capacitor as output filter. Its dynamics and steady state are studied and constitute an important help for any designer.