# How to use a real current source?

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Fernando Belda on 22 Sep 2021
Commented: Fernando Belda on 22 Sep 2021
Hello everyone!
I have to simulate the operation of a battery under current demand. In this circuit I have to control a switch which connect and disconnect the battery when certain limits of voltage and/or current are overpassed.
My problem is that what I have to work with is a current demand curve, not the voltage demand. When I transform the data over time values to current values due to a current source, even if the switch is open, the current continues flowing. I think that the problem is that this source is ideal, so it has enough power to generate an infinite voltage so the current can continue flowing. I have tried with different types of switchs, MOSFETS, CircuitBreaker blocks and the result is the same.
Please, do you know of a way/block that I can apply to my circuit to the current curve but when the switches open this current is interrupted?
To simplify my circuit I have created this one with the same problem (also attached). The current demand as well as the switch control signal are generated by two different pulses:
Data:
-Switch Threshold: 0.5V
-Switch Control Pulse: Amplitude=1V, Period=100s, Pulse width=50%, Delay=0s
-Switch Control Pulse: Amplitude= +-5A, Period=400s, Pulse width=50%, Delay=0s
Fernando Belda on 22 Sep 2021
This is hwhat the scope shows (real current and current pulse generator signal coincide).

Jonas on 22 Sep 2021
Instead of using an ideal current source, use an ideal voltage source with a resistor in parallel.
Fernando Belda on 22 Sep 2021
Hi Jonas,
Unfortunately I cannot do that because the purpose of the simulation is to apply exactly the current curve that I have to the battery.

R2021a

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