Power backup supply

Thread Starter

Ettienne

Joined Mar 26, 2019
8
I need ideas for a cheap power supply with a battery backup I need a 5amp 12v pulse for 0,5 seconds to drive a reversible dc motor. The pulse is needed to power an actuator that opens a lock.
 

AnalogKid

Joined Aug 1, 2013
11,200
Please supply a LOT more information.

What is the relay coil resistance?

What is the power source for the circuit?

What do you mean by "delay off"? Do you want the relay contacts to close for 0.5 s when power is applies, then open indefinitely until power is cycled? Or something else?

Is this for an industrial environment? Outdoors? Under water?

ak
 

AnalogKid

Joined Aug 1, 2013
11,200
What is the shortest time period between output pulses?

What is the power source for the circuit? Voltage? Available current?

How accurate does the 12 V value have to be? +/-1 V? +/-20%? etc.

Are there environment or size or cost constraints?

ak
 

crutschow

Joined Mar 14, 2008
34,842
Any size constraints on the battery?
Otherwise a small, sealed, lead-acid, absorbed-glass-mat (AGM) battery (such as this) can deliver a high pulse current, are relatively cheap, and easy to trickle charge from a small 15Vdc (wall-wort) supply.
 
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