Uninterruptable-supply


Posted on Aug 5, 2012

This circuit provides a continuous supply of regulated + 5 V, with automatic switch-over between line power and battery backup. When the line-powered input voltage is a + 5 V, it provides 4A V to the MAX630 and trickle charges the battery, If the line-powered input falls below the battery voltage, the 3.6 V battery supplies power to the MAX630, which boosts the battery voltage up to +5 V, thus maintaining a continuous supply to the uninterruptable +5 V bus. Since the +5 V output is always supplied through the MAX630, there are no power spikes or glitches during power transfer.


Uninterruptable-supply
Click here to download the full size of the above Circuit.

The MAX630"s low-battery detector monitors the line-powered + 5 V, and -the LBD output can be used to shut down unnecessary sections of the system during power failures. Alternatively, the low-battery detector could monitor the NiCad battery voltage and provide warning of power loss when the battery is nearly discharged. Unlike battery backup systems that use 9-V batteries, this circuit does not need +12 or +15 V to recharge the battery, Consequently, it can be used to provide + 5 V backup on modules or circuit cards which only have 5 V available.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

1.5V Battery FM transmitter
diy time lapse circuit
Lights On!
High impedance DC voltmeter
Plans for the Next MP3 Player
The application circuit of TDA7088 FM integrated circuit
Vincent Motorcycle Electrics
OP90 Micropower Instrumentation Amplifier



Top