Gorodny O. Energy characteristics of quasiresonant switched-mode semiconductor converters

Object of researching: Buck (sequential) and Boost (parallel) topologies of quasiresonant (ZCS, ZVS) and switched-mode (PWM) electric energy converters. Aim of work: Developing of high-frequency Buck (sequential) and Boost (parallel) quasiresonant switched-mode with improved energy characteristics due to changes of commutation modes of semiconductor switches. Methods of researching: Theory of electrical circuits, continuous and discrete Laplace transformations, generalized method of node potentials, piecewise fitting method, differential equation system solving, mathematical and physical modeling. Theoretical and applying results, and innovations: Developed a novel calculation method of commutation process analysis in semiconductor switched-mode converters which consider a combination of influences of semiconductor switches parasitic parameters and variation in time of power supply voltage and load; First performed a complex comparative analysis of power consumptions in semiconductor switches which are parts of different types of switched-mode electric energy converters, which shows a significant advantage of quasiresonant (ZCS, ZVS) versus switched-mode (PWM) principles of operation; Introduction of the concepts of commutation characteristics allow to adjust duration of control signals to semiconductor switches, resulting in keeping zero-current condition near their commutation moment, which simplify developing of control system for similar converters; In "hard" commutation mode in semiconductor switch determined level of losses power increasing, which dissipated on it, which impact need to consider in thermal modes and heat sink calculation process. Subjects and Degree of Implementation: The research results are implemented in education process of ChNUT and at SRI "Peretvoryuvach" Ltd (Zaporizhzhia, Uraine) and PAC "CheZaRa" (Chernihiv, Ukraine). Efficiency of application: The using of research results allow to simplify the developing of secondary-side power supplies. Scope of application: Energy efficient secondary-side power supplies.