In order to reduce fuel usage and greenhouse emissions,there is growing interest in electric vehicle technologies. Battery chargers play a critical role in the evolution of this technology. The charging time and lifetime of the battery have strong dependency on the characteristics of the battery charger. The conventional battery charger consists of an AC/DC rectifier to generate a DC voltage from the AC line, followed by a DC/DC converter to generate the required DC voltage level for the battery pack. Traditionally, the input section of an AC/DC converter consists of a full-wave rectifier followed by a large capacitor. The current drawn from the AC line in such a case is not sinusoidal and consists of pluses of relatively short duration and large peak value. Such a current is undesirable because it has a high rms value which leads to high losses. Also, such a current is rich in harmonics which may interfere with other loads connected to the AC line. So the battery charger should have power factor correction stage to make the input current sinusoidal. Single stage type battery charger combines the power factor correction stage and DC/DC conversion stage into one. This charger has fewer components that reduce volume and weight of charger. So it is more efficient and suitable for electric vehicles. In this thesis, at first section,battery charger left; TEXT-INDENT: 0cm; MARGIN: 0cm 0cm 0pt; unicode-bidi: embed; DIRECTION: ltr" align=left Key Words Battery charger, Electric vehicle, Single stage converter, Power factor correction, Constant current and constant voltage, Phase shifted full bridge, Soft switching.
