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Copyright of Tecnura is the property of Tecnura and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

An analysis of the conmutation processes in different modes of operation (inductive, capacitive and resistive) of the paralell-resonant inverters is presented in this paper. First the ideal and real behaviours of its semiconductor components are considered and the iddle components are excluded. Also the modes of operation corresponding to the proper MOSFET transistors trigger angle are analyzed. Second, the case in which the value of idle inductances of the circuit cannot be neglectable is considered, analysing also why are not commendable in this conditions the common conmutation strategies. A calculation strategy for proper moment of the transistors' triggering which provides a sure opperation in any working instant of the inverter circuit in optimum commutation mode is verified. Several simmulations that confirms the results validity using ORCAD software, are performed. [ABSTRACT FROM AUTHOR]

This paper presents an analysis of the sigma-delta conversion applied to the control of the DC link resonant inverters. This inverter configuration is often employed as a part of photovoltaic system because it presents the advantage that the semiconductors elements commute at zero tension or zero current. It happen on the high frequency elements and the inverter elements, and it is not necessary to modulate the DC tension, condition that simplified the control loop. Conversion analog-digital is an important step of the almost every modern electronics systems. After the signal is translated to the digital format, it can be processed easily in order to obtain the required information. [ABSTRACT FROM AUTHOR]