I have this circuit that i need to design, but i dont know how!
The paramaters are as follows:
11-15V DC 500mA adjustable output PSU with 110V or 220V selectable input voltage.
The unit wil be used to charge a 7,2 Ah sealed lead acid battery, it has to have an additional output that indicates that the psu is functioning i.e. blocking diode. Further the unit has to have a pic microcontroler monitoring the battery voltage if the main AC voltage has failed. If the Battery voltage drops below a certain point for longer than sixty seconds the pic must switch the state of an input and start a 5min timing cycle. At the end of the timing cycle the battery must be disconnected from the circuit (I thought of breaking the currunt flow through a self-latching relay). Also when the main AC voltage is restored the battery must be reconnected to the circuit in order to be recharged.
Any ideas or suggestions wil be appreciated.
Thanx!
The paramaters are as follows:
11-15V DC 500mA adjustable output PSU with 110V or 220V selectable input voltage.
The unit wil be used to charge a 7,2 Ah sealed lead acid battery, it has to have an additional output that indicates that the psu is functioning i.e. blocking diode. Further the unit has to have a pic microcontroler monitoring the battery voltage if the main AC voltage has failed. If the Battery voltage drops below a certain point for longer than sixty seconds the pic must switch the state of an input and start a 5min timing cycle. At the end of the timing cycle the battery must be disconnected from the circuit (I thought of breaking the currunt flow through a self-latching relay). Also when the main AC voltage is restored the battery must be reconnected to the circuit in order to be recharged.
Any ideas or suggestions wil be appreciated.
Thanx!