The charge controller intended to design and implement in this research work is a small power charge controller. Figure 2.6 shows the block diagrams of the charge controller. The charge controller is built around semiconductor switches (silicon controlled rectifier -SCR) rather
The electromechanical switches (relays). The microcontroller is used to control the overcharging of the battery, to d splay the battery voltage continuously and to make audible alarm when the battery is fully charged. Firstly the battery is charged using high Current through the SCR. When the battery almost reaches its full terminal voltage (full charge) high current charging is cut off and slow charging (trickle charging) is still done. At full charge condition the charging is totally cut out by the control of the microcontroller. The current coming from the wind turbine through the converter circuit is diverting to another load (e.g. lamp). By this means the overcharging of the battery is prevented. The constructed charge controller can charge the 12 V battery with u p to 6 A of current. The amount of charging current can be increased by changing some components in the charge controller without any difficulty.