Control for the Contactless Series Resonant Energy Converter

2. The Control Of The Slsr And Contactless Converters

Several control methods are known to have been developed during the last 30-35 years and many of them are already considered classical, implemented in factory-made resonant converters, e.g. Hewlett-Packard (1982). The problem of the resonant converter physics is that the energy is flowing from magnetic to electric and vice versa, so the instantaneous control is extremely difficult. It is not possible to cut off the process in the right moment. The difficulty is even greater if contactless energy is to be transferred through a loosely coupled magnetic transmitter/receiver, in which case the reaction should be fastest, to avoid damaging the power switching devices. In the effort to maintain the operation of the SLSR converter stable and efficient and especially, to keep the contactless converter in the best efficiency operation region, the modes of operation were considered, and some graphical methods are already in use, e.g. (Jovanovic, Liu, Oruganti, & Lee, 1987). The safe behaviour of the SLSR converter, especially the transmitting part, is very important for the mass inclusion of the wireless energy in the electric vehicle charging technology (Valtchev, Jorge, Craciunescu, & Brandisky, 2012) and some initial ideas are discussed in (Medeiros, Valtchev, & Valtchev, 2012).