Hi All,
How do i go about working out how long i can power something from a capacitor. i have always wanted to know this and it just so happens a relevant project has come up where i get to try it out.
I want to try and run a circuit for atleast 5 seconds in the event of a power failure. The circuit runs off a DC PSU
Basically, when the power fails the capacitor provides the power for as long as it can (5 sec). The caps i have chosen are super caps.
I know my circuit uses 12V and consumes 1.5A when running. if i choose a 1F capacitor, how do i work out the legth of time it will take before it dies?
I know caps have an exponensial discharge curve but i also know my circuit operates anywhere from 12V to 9V. Therefore this is the range i wish to keep the circuit powered.
The hard part is working out how long it can provide 1.5A. i can work out how long it takes to fall from 12V to 9V but what about the current?
Can anyone help me with this or provide a formula.
Thanks
How do i go about working out how long i can power something from a capacitor. i have always wanted to know this and it just so happens a relevant project has come up where i get to try it out.
I want to try and run a circuit for atleast 5 seconds in the event of a power failure. The circuit runs off a DC PSU
Basically, when the power fails the capacitor provides the power for as long as it can (5 sec). The caps i have chosen are super caps.
I know my circuit uses 12V and consumes 1.5A when running. if i choose a 1F capacitor, how do i work out the legth of time it will take before it dies?
I know caps have an exponensial discharge curve but i also know my circuit operates anywhere from 12V to 9V. Therefore this is the range i wish to keep the circuit powered.
The hard part is working out how long it can provide 1.5A. i can work out how long it takes to fall from 12V to 9V but what about the current?
Can anyone help me with this or provide a formula.
Thanks