3Phase Battery Charger : The 3Ph. input is fed to the stepdown transformer with Single Phasing Protection ( 415Vac/135Vdc ). This 55Vac is then rectified and fed to voltage regulator and filter circuits. This output voltage of 115Vdc is provided at output terminals to charge the Batteries.Whenever the battery gets discharged the intelligent IC checks the drop in battery voltage and provide a pulse to Thyristor through Gate to conduct and provide the output to battery at the same time when battery is fully charged the gate voltage is made zero because drain-source current is also almost zero hence the Thyristor stops conducting and stops providing output to charge the battery. So when the Battery is fully charged no overcharging is there to damage the Battery. At this stage Output voltage remains same but output/ Charging current is zero. It is called as Float mode.