In a dual converter, two converters will be linked together back to back and they are mostly found in variable speed drives (VFDs). Dual converter operation is described using the diagram below and we can assume that
Assume that a dual converter operates without circulating current and the AC current will be banned from flowing by controlled firing pulses. This will make sure that the converter which carries the load current will conduct whereas the other converter will be blocked. This implies that a reactor is not required among the converters.
Battery charger also called as a recharger will make use of electric current for storing the energy in a secondary cell and the charging process will be defined by the type and size of the battery. Various types of batteries will be having several tolerance levels for overcharging. Recharging process is attained by connecting it to a constant voltage or constant current source.
Charging rate can be defined as the rate of charging or discharging a battery and is equal to the battery capacity in one hour. Battery charger can be defined in terms of its charging rate C. For instance, a battery charger with C/10 rating will provide charging capacity in 10 hours whereas one rated 3C will charge a battery in 20 minutes.
Below are five main types of battery charges.
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