13
Figure 4.5 bridge inverter
4.4 Charger/Discharger
The function of charger is to charge and maintain the batteries at fully charged condition.
When the battery is working in charging mode, the control board will enable the charge
control circuit and disable the discharge control circuit. As showed in figure 4.6, the charge
control circuit provides PWM waves to regulate the cycle of Q8/Q9/Q10/Q11 on and off in
this mode. The control board will disable the charge control circuit and enable the
discharge control circuit when the battery is working in discharging mode. In this mode,
the discharge control board will provides PWM waves to regulate the cycle of Q6/Q7 on
and off. In this way, the BUS voltage can be controlled by the control board, and the output
DC voltage will be filtered by L7 and C19. Then, we can get relatively stable BUS voltage.
Figure 4.6charge circuit
Figure 4.7 discharge circuit
4.5 EMI Board
Input EMI board is connected between solar panel and the input of BOOSTER. Output