Showing papers by "Ramesh Oruganti published in 1985"
24 Jun 1985
TL;DR: In this article, the concept of resonant switch was proposed to overcome the obstacles of higher switching stresses and switching losses in conventional switching converters, by incorporating additional Land C elements to shape device current and voltage waveforms, the desired zero-current switching property can be realized.
Abstract: In designing conventional switching converters, the effort to increase operating frequency in order to reduce weight, size and cost of magnetic and filter elements is constantly hampered by higher switching stresses and switching losses. To overcome these obstacles, the concept of resonant switch was proposed. By incorporating additional Land C elements to shape device current and voltage waveforms, the desired zero-current switching property can be realized which enables converters to operate in the megahertz range.
287 citations
TL;DR: In this article, the steady-state and transient characteristics of a series resonant converter were investigated using stateplane techniques in conjunction with piecewise linear analysis. But the state-plane technique was not applied to the case of a single-input single-output (SISO) converter.
Abstract: State-plane techniques in conjunction with piecewise-linear analysis is employed to study the steady-state and transient characteristics of a series resonant converter. With the direct viewing of the resonant tank energy and the device switching instant, the state portrayal provides unique insights into the complex behavior of the converter. Operation of the converter under both continuous and discontinuous current modes and at frequencies both below and above resonant frequency are discussed.
227 citations
TL;DR: In this article, a new control method, optimal trajectory control, is proposed which, by utilizing the state trajectories as control laws, continuously monitors the energy level of the resonant tank.
Abstract: The nature of resonant converter control is discussed. Employing the state portrait, different control methods for series resonant converter are identified and their performance evaluated based on their stability, response to control and load changes and range of operation. A new control method, optimal trajectory control, is proposed which, by utilizing the state trajectories as control laws, continuously monitors the energy level of the resonant tank. The method is shown to have superior control properties, especially under transient operation.
151 citations
24 Jun 1985
TL;DR: In this article, a method for analyzing the complex operation of a parallel resonant converter is developed, utilizing graphical stateplane techniques, which uncovers the presence of other complex modes besides the continuous conduction and the discontinuous conduction modes and determines their theoretical boundaries.
Abstract: A method for analyzing the complex operation of a parallel resonant converter is developed, utilizing graphical state-plane techniques. The comprehensive mode analysis uncovers, for the first time, the presence of other complex modes besides the continuous conduction mode and the the discontinuous conduction mode and determines their theoretical boundaries. Based on the insight gained from the analysis, a novel, high-frequency resonant buck converter is proposed. The voltage conversion ratio of the new converter is almost independent of load.
138 citations
Proceedings Article•
01 Oct 1985TL;DR: In this paper, a comprehensive analysis of the high-frequency quasi-resonant buck converter is presented using the graphical stateplane technique, revealing the presence of several unfamiliar modes of operation.
Abstract: A comprehensive analysis of the high-frequency quasi-resonant buck converter is presented using the graphical state-plane technique. The analysis has revealed, for the first time, the presence of several unfamiliar modes of operation. The voltage conversion ratio and boundary switching frequency for each mode are derived. The existence of various operating modes are verified experimentally.
1 citations