I am required to come up with a current injection circuit. The circuit would output user defined currents(preferably use a microcontroller for this purpose) I'm looking for a range of 0A-12A.
Please any input is deeply appreciated, I'm clueless here
Thanks for the reply. This is part of a project I am assigned. If I describe the whole scenario, this is what happens...
The user selects the level of current from an interface in the computer. Then the computer communicates wit a circuit and that specified current is injected from the circuit into a relay. The tripping time is sent back to the computer.
I'm talking about the circuit which output that specified current to the relay. Hope I made it clear enough. Current have to be controlled within 0 - 12A
So a circuit breaker tester, there would appear to be 3 parts to this
1. Generate the current
2. read the current
3. read the time delay in tripping the breaker
Doesn't matter, circuit breakers will work with either, as for the current try relays switching at, say, 1 Amp levels and transistor-fet to supply at lower levels. So have a bank of relays directing the voltage source through a resistor which will keep the current to desired level to a paralleled output.
A careful selection of currents via the relays will reduce the amount of relays needed eg 1,2,4,5 Amps will give you 0-12Amps in 1 Amp steps except 8amps,so you can see 12 relays aren't needed. The transistor supply will need to be able to supply 0-1A.
A careful selection of currents via the relays will reduce the amount of relays needed eg 1,2,4,5 Amps will give you 0-12Amps in 1 Amp steps except 8amps.
Doesn't matter, circuit breakers will work with either, as for the current try relays switching at, say, 1 Amp levels and transistor-fet to supply at lower levels. So have a bank of relays directing the voltage source through a resistor which will keep the current to desired level to a paralleled output.