Decoupled output voltage control of quantum series resonant converter for improved buck-boost operation

• Published in: IEEE transactions on power electronics Vol. 11; no. 1; pp. 147 - 161
• Main Authors: JO, B.-R, AHN, H.-W, MOON, G.-W, CHOI, H.-C, YOUN, M.-J
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.01.1996; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Applied sciences; Boosting; Capacitors; Current control; Electrical engineering; Electrical engineering. Electrical power engineering; Electronics; Exact sciences and technology; Filters; Inductors; Power electronics, power supplies; Resonance; Robustness; Switches; Switching converters; Voltage control; Averaging method; Circuit design; Computer simulation; Buck boost converter; Series resonance; Direct current convertor; Static convertor; Voltage control; Operation study; Experimental result; Decoupling; Output voltage; Non linear model; Switching power supply; Time curve; Dynamic model
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/63.484428

A new output voltage control technique is proposed to obtain the improved buck-boost operation of the quantum series resonant power converter (QSRC). The new nonlinear dynamic model of QSRC is first derived and the cross-coupled nonlinear term existing in the output voltage dynamics is decoupled by using control methods such as the periodic control of the boosting switch (PCBS) and the resonant current control (RCC). By applying the state-space averaging concept to the decoupled dynamics, two linear large signal averaged models are obtained for PCBS and RCC schemes. Using the proposed technique, the flux imbalance problem of the isolation transformer and the robustness of the output voltage response can be easily considered. This technique can also be widely applicable to the cascade buck-boost power converter, which can be implemented by inserting a boosting switch between the output filter inductor and the ripple capacitor of the forward power converter. The validity of the proposed scheme is confirmed by the computer simulations and the experiments.