OPTIMAL TRAJECTORY CONTROL OF SERIES RESO NANT CONVERTER - IMPLEMENTATION OF AN INTEGRATED AUTOMATON

The control of series resonant converters remains an important axis of research. A classical frequency control gives often current and volta ge overshoots which could damage the power semiconductors. The duratio n of these transient states reduces considerably the converter pass ba nd. The principle of the presented control consists in the imposition of an optimal trajectory in the state plane diagram. Thus, the state v ariables characterising the resonant circuit are perfectly mastered. T ransient states have a minimal duration, the state variables do not ha ve overshoots. The high frequency operation of the resonant converter is a constraint to make a digital control. To reduce the calculation t ime, the control is made by a control automaton elaborated with an ASI C (Application Specific Integrated Circuit) using configurable logic c ircuits.