Power conversion system is sometimes constructed
by paralleling converters in order to improve performance
or reliability, or attain a high system rating. The
parallel converters operation is a usual operation mode
in the telephone-exchange power supply systems. Some
authors put their atention in the study of the current
sharing techniques depending on the load requirements
[1],[2],[3]. All of them considered the buck converter
parallel operation as an autonomous system. The current
reference values have been provided to the buck
converters from the central control unit and the DC to
DC converters do not operate under the synchronous
mode [l]. The parallel operation of boost converter is
an attractive operation mode as well. In [5] authors
discuss current ripple cancellation by simultaneous operation
of two boost converters.
The inverters in electric vehicle consist of six transistors
and diodes. It is simple to establish the battery
charger circuit from this set of elements. It is possible
to establish the different battery charger structures
by using the inverter elements. Same converter circuits
are going to be describe here. From the set of the converter
circuits, the double buck and single boost have
been chosen. By using this structure, it is possible to
avoid the high current distortion when the single buck
converter operates. This property could be reached if
the double-buck structure is operated in synchronous
mode. The voltage control and current inner loop control
will be also presented.
The objectives for such operation mode is to reach
the unity power factor operation with less current distortion
than that of are ordinary buck converter (41.
Such battery charger structure is also appropriate for